What Is Mica Powder?

What Is Mica Powder?

1.Glossary:

Mica powder is a kind of non-metallic mineral, which contains various components, mainly including SiO2, the content is generally about 49%, and the content of Al2O3 is about 30%. Mica powder has good elasticity and toughness. With insulation, high-temperature resistance, acid and alkali resistance, corrosion resistance, strong adhesion, and other characteristics, it is an excellent additive. It is widely used in electrical appliances, welding electrodes, rubber, plastics, papermaking, paints, coatings, pigments, ceramics, cosmetics, new building materials, and other industries, and has a wide range of uses. With the continuous development of science and technology, people have opened up new application fields.

 

2.Structure:

Mica powder is a silicate with a layered structure, and the structure is a compound silicon-oxygen layer composed of two layers of silicon-oxygen tetrahedron sandwiching a layer of aluminum-oxygen octahedron. Complete cleavage can be split into very thin flakes, with a thickness of less than 1 μm (in theory, it can be cut to 0.001 μm), with a large diameter-to-thickness ratio; the crystal chemical formula of mica powder is K0.5-1 (Al, Fe, Mg)2(SiAl)4O10(OH)2nH2O, general chemical composition: SiO2: 43.13-49.04%, Al2O3: 27.93-37.44%, K2O+Na2O: 9-11%, H2O: 4.13-6.12%.

 

3.Features:

Mica powder belongs to monoclinic crystal, the crystal is scaly, with silky luster (muscovite is glass luster), the pure block is a gray, purple rose, white, etc., diameter-thickness ratio> 80, specific gravity 2.6-2.7, hardness 2-3, rich in elasticity, bendable, good abrasion resistance and abrasion resistance; heat-resistant and insulating, insoluble in acid and alkali solutions, and stable in chemical properties. Test data: elastic modulus 1505-2134MPa, heat resistance 500-600°C, thermal conductivity 0.419-0.670W.(m.K)-1, electrical insulation 200kv/mm, anti-radiation 5×1014 thermal neutrons/cm2 against illumination .

In addition, the chemical composition, structure, and structure of mica powder are similar to kaolin, and it has some characteristics of clay minerals, that is, good dispersion and suspension in aqueous media and organic solvents, fine white particles, and stickiness. Therefore, mica powder has many characteristics of mica minerals and clay minerals.

 

4.The mesh number of mica:

It is the particle size or thickness of the material. The general definition refers to the number of holes per inch (25.4mm) of the length of the screen, which is defined as the mesh number; among them, 1250 mesh is 10um, and 2500 mesh is 5um. The larger the mesh number, The smaller the particle size.

According to different particle sizes, mica powder can be divided into mica flakes and mica powder.

The number of mica sheets mainly includes 4 mesh, 6 mesh, 40 mesh, 60 mesh, 100 mesh, 200 mesh, etc.

Mica powder mesh mainly includes 325 mesh, 400 mesh, 800 mesh, 1250 mesh, 2000 mesh and 3000 mesh, and ultrafine mica powder.

 

5.Production area distribution:

China's sericite mineral resources reserves are large and widely distributed. According to the origin of sericite deposits, sericite deposits are generally divided into schist-type sericite deposits (Chuzhou sericite mine, Anhui), porphyry-altered sericite deposits (Liujiawan porcelain stone mine, Jingdezhen, Jiangxi), and volcanic-altered sericite deposits. Mica deposits (quartz-sericite deposits in southern Zhejiang, Nan'an, Fujian, etc.), secondary quartzite-type illite-sericite deposits (volcaniclastic alteration type illite-sericite deposits in eastern Zhejiang), claystone-type sericite illite deposits (Illite clay mines in Huairou, South Sichuan, etc. in Beijing), among which the development and utilization value of schist-type sericite mines is the greatest, because the mica characteristics of this type of sericite mines are the most obvious.

Most of the products of mica powder are from Chuzhou, Anhui, and a large-scale production base has been established, which has great advantages in product quality.

6.Use:

  1. Coating field

Coating mica powder is a new type of functional green filler. Its unique two-dimensional flake barrier, UV shielding, chemical structure stability, and other functions can effectively improve the permeability resistance, weather resistance, wear resistance, and durability of the coating film. Corrosive, in addition, does not contain any radioactive elements, leading to the trend of green and environmental protection in the field of coatings. It is widely used in building exterior wall coatings, anti-corrosion coatings, powder coatings, high-temperature resistant coatings, insulating coatings, waterproof coatings, road marking coatings, anti-radiation coatings, and some special coatings, such as marine coatings, spacecraft thermal control coatings and food utensil coatings wait.

  1. Cosmetics field

Cosmetic-grade mica has a unique flaky structure, silky luster, and smooth texture, making the cosmetic powder as light and delicate as silk. The natural texture makes the skin have excellent affinity and crystal clear effect and endows cosmetics with a soft touch, soft luster, good affinity, and strong skin adhesion. It is the first choice of high-grade powder raw materials in the cosmetics industry.

In addition, the crystal transparency of mica powder can keep the makeup color consistent and strong, and it is also suitable for various shades of color. The unique nature of sericite can also add silky soft luster to the manufacture of cosmetics. The products are widely used in many fields such as pressed powder, powder, eye shadow, liquid foundation, blush, powder, and so on.

  1. Plastic field

Plastic mica powder has the characteristics of a high diameter-to-thickness ratio, high-temperature resistance, acid, and alkali resistance, and wear resistance. It is a natural functional powder-filling material. The company selects high-quality mica ore and adopts unique wet grinding, peeling, and purification process, the mica layer is completely cleaved, and the unique high-diameter-thickness ratio structure of mica (the diameter-thickness ratio is as high as 100 or more) is preserved, so that it can be used in plastic products It has a prominent reinforcing effect and endows plastic products with excellent dimensional stability; the high-temperature resistance of the product itself also greatly improves the Vicat softening point of plastic heat deformation thermometers, which is suitable for parts and products under high-temperature conditions; mica and glass fiber Compared with the product, it has the characteristics of smooth surface, no warping and deformation. Products are widely used in PP, PA, PBT, PET, and other plastic modification, functional masterbatch, and plastic engineering applications.

Coatings are easy to age, not heat-resistant, and have poor impact resistance, which inhibits the application of plastics. Mica powder, its unique and excellent performance is filled into plastics, which can reduce the shrinkage, warpage, and curvature of the product; improve the mechanical properties, heat resistance, insulation, and chemical stability of the product; increase the surface gloss of the product; While preventing plastic aging, it also expands the application field of plastics and improves the added value of mica mineral powder. Utilizing the basic characteristics of flaky mica, supersonic airflow pulverization, and surface chemical modification are carried out to change the properties of mica scales, and a polyethylene reinforcing agent is prepared. The research results show that the active flaky mica improves the mechanical properties of polyethylene and has the ability to strengthen the effect. The study found. The modified mica and PP have an obvious synergistic strengthening effect, which can effectively improve the tensile strength, impact strength, bending strength, modulus, hardness, and heat distortion temperature of PP. The study found that mica powder is used as a new reinforcing filler in polyvinyl chloride, which is beneficial to plastic processing enterprises to reduce production costs and improve product quality. Research has found that modified mica can not only enhance the rigidity and heat resistance of nylon 6, reduce molding shrinkage, but also greatly reduce the production cost of nylon 6 in the modification of nylon 6, which is conducive to enhancing market competitiveness, which is conducive to the expansion of market application fields. The modified nylon 610 material was prepared by multi-component blending modification technology of crosslinking agent, mica powder, and nylon 610. The results showed that moderate crosslinking and adding mica powder can improve the mechanical properties and electrical strength of nylon 610 resin. Crosslinking agent The content of mica powder and modified nylon 610 is 5% and 10% respectively. The surface of muscovite was modified with a silane coupling agent, and it was compounded with acrylonitrile-butadiene-styrene copolymer (ABS) to prepare composite materials. The results show that muscovite is distributed in ABS in a lamellar structure, which can effectively improve the rigidity of ABS, and can greatly reduce the cost on the basis of maintaining good comprehensive mechanical properties.

Phthaloyl was used to treat mica in Lingshou County to fill the modified polyaryletherketone. It was found that the modified mica could significantly improve the tensile strength, tensile elastic modulus, and elongation at the break of polyaryletherketone. Studies have found that when mica is used to fill polymer materials such as polyolefins, polyesters, polyamides, and polyurethanes, the tensile strength, tear strength, and Shore hardness of the prepared composite materials are all improved to varying degrees. Composite materials made by mixing mica with thermoplastic resins or thermosetting resins are engineering plastics with a wide range of uses.

  1. Electronic field

Mica powder is a new type of special functional filler, which is suitable for the technical requirements of the copper-clad laminate industry. It can replace electronic grade silicon micro powder and endow the board with ideal insulation, rigidity, low expansion rate, drilling processability, heat resistance, and process stability. performance. The material is completely chemically inert, and will not decompose, deteriorate or induce reactions even in high temperature and complex systems. It especially has the characteristics of greatly improving drilling efficiency, and drilling quality, and reducing drill wear. It is gradually becoming a popular material in the copper-clad laminate industry.

  1. Rubber field

Mica powder is an excellent rubber filling and reinforcing material. The unique structure of the high diameter-thickness ratio can improve the reinforcing effect excellently. The excellent thin-flaky crystal shape greatly improves air tightness. The polarizing effect of its own mineral crystals and the interference of interlayer water molecules Effect, effective shielding of ultraviolet rays, microwaves, and infrared rays, greatly improving the aging resistance of products.

The application results of Beijing Rubber Research Institute, Henan Tire Factory, Sichuan Rubber Factory, and other manufacturers of tires, tapes, rubber sheets, rubber hoses, automotive rubber parts, and other products prove that sericite powder has good processing performance and can replace 30-50% Semi-reinforcing or other coarse-grained carbon black, or adding a certain proportion of sericite powder to the original formula can keep the performance of the rubber compound unchanged and reduce the cost of the product.

  1. Field of refractories

In the field of refractory materials, mica powder has the advantages of stable main mineral content, moderate refractoriness, stable physical and chemical properties of insulation and heat insulation; good mud cohesion, no expansion, fast drying speed, good plasticity, and strong resistance to iron flow erosion.

  1. Welding rod field

In the field of welding consumables, mica powder is a new type of electrode coating material. Its unique combination of chemical elements can improve arc stability, reduce spatter, improve the process performance of electrodes, and solve the problem of electrode coating cracking that often occurs in the production process of electrodes. The problem, when used in acid electrodes such as E4303 and E4313, the recommended ratio is 3%-5%. At the same time, it has certain elasticity and plasticity, which can increase the slipperiness of the electrode coating and the fluidity in the powder tank, and improve its Pressure coating performance, replacing titanium dioxide, and reducing the cost of welding rods.

  1. Ceramic Industry

Mica ceramics is a special engineering material, which is suitable for the production of heat-resistant materials, insulating materials, high-temperature mechanical parts, etc., and is widely used in electrical and electronic industries. Mica ceramics are generally made by the crystallized glass method or sintering method. However, the flexural strength of mica ceramics produced by these two processes is not ideal enough. For example, the flexural strength of mica ceramics produced by the glass crystallization method is generally only in the range of 100-140MPa, and the flexural strength of mica ceramics produced by the sintering method is in the range of 120-130MPa. In order to significantly improve the strength characteristics of mica ceramics, a foreign company through painstaking research and development, invented an ingredient for the production of high-strength mica ceramics.

According to reports, the ingredients are made of phlogopite and alumina as the main raw materials, with barium fluoride and calcium fluoride admixtures added. The use of this ingredient can effectively improve the strength properties so that the flexural strength of the mica ceramics exceeds 160MPa. In order to evaluate the performance of high-strength mica ceramics, the company conducted the following tests. According to the ingredients given in Table 1, add the appropriate amount of water, mix and grind in a ball mill for 24 hours to prepare the mixture, press it into a round test body under pressure of 75MPa, and then fill it with fluor phlogopite powder. ℃ and 1300 ℃ for 1 hour, cooled and measured the flexural strength, machinability, thermal expansion coefficient, and electrical properties of the sintered specimen. The measurement results show that the mica ceramic not only maintains the inherent characteristics, but also has good processability, and more importantly, the flexural strength is significantly improved. So it works better.

 

8.processing method:

According to the processing technology, mica powder can be divided into dry processing and wet processing.

  1. Raymond mill processing

Mineral dressing—coarse crushing—processing—grinding—grading—packaging—finished product.

The content of mica powder in this product can reach more than 70%. It is suitable for use in medium and low-grade paints, exterior wall paints, anti-corrosion and arson paints, marine paints, rubber, welding electrodes, cables, and other industries, and the effect is very good.

  1. Adopt a new process - airflow purification and classification processing

Mineral dressing—coarse crushing—processing of semi-finished products—purification—grinding—grading—packaging—finished products.

This process separates mica and quartz, so that the mica powder is highly purified, and the mica content can reach more than 95%. The technical index of this product can reach the standard of wet process mica fine powder. Under automatic control, this set of advanced equipment produces standardized mica powder, which preserves the original unique scale-like structure of mica ore, has a high diameter-to-thickness ratio, and is of excellent quality. Mica powder is suitable for use in medium and high-grade exterior wall coatings, powder coatings, anti-corrosion and arson coatings, marine coatings, multifunctional paints, and coatings, with good results.

 

9.category:

Muscovite powder

The chemical formula of muscovite is KAl2(AlSi3O10)(OH)2, which has a continuous layered silicon-oxygen tetrahedral structure, with a very complete cleavage, and can be peeled off into elastic sheets, soft and bendable, transparent and colorless, half thick Transparent with gray, brown, light green, rose red, with glass to silk or pearl luster, hardness 2.5~3, specific gravity 2.75~3.0, acid resistance.

The chemical composition of muscovite: KAl2[Si3AlO10](OH, F)2, the ideal composition is octahedral sheets containing Al, and can also be replaced by Fe3+, Mg, Fe2+ or even Mn, Cr, V, etc. in a small amount. Muscovite has a highly complete bottom cleavage and is pale in color. The characteristics of flakes are elastic.

The muscovite powder is widely used in the building materials industry, fire protection industry, fire extinguishing agents, welding rods, plastics, electrical insulation, paper making, asphalt paper, rubber, pearlescent pigment, and other chemical industries. Ultrafine mica powder can be used as a functional filler in plastics, coatings, paints, rubbers, etc., which can improve its mechanical strength, and enhance toughness, adhesion, anti-aging, and corrosion resistance. In addition to having extremely high electrical insulation, acid and alkali corrosion resistance, elasticity, toughness, and sliding properties, heat resistance and sound insulation, and small thermal expansion coefficient, etc., it is also the first to introduce the smooth surface of the sheet body, large diameter-to-thickness ratio, regular shape, and attachment. Focus on strong and other characteristics.

synthetic mica

Synthetic mica wafers, also known as synthetic fluorine phlogopite mica wafers, are made of chemical raw materials through high-temperature melting, cooling, and crystallization, and are typical layered silicates. It is a colorless, good transparent material from ultraviolet to infrared (5um), and the breakdown strength decreases with the increase of mica sheet thickness (test conditions: AC 50Hz, planar electrode <φ25mm>, vertical cleavage plane). The vacuum outgassing of synthetic mica wafers is extremely low, and the trace gases released are only adsorbed gases such as O2, N2, and Ar as measured by a mass spectrometer. Because it does not emit water vapor, it is extremely valuable for use as an electrical vacuum insulating material, and will greatly increase the service life of vacuum devices.

The product is pure white and transparent, has high toughness and strength, and can be peeled off endlessly. It is the top choice material for cutting-edge and high-quality materials. It can be used for grinding high-end pearlescent mica powder, and it is also the best base material for manufacturing high-quality high-temperature-resistant insulation products.

Fluorphlogopite has excellent properties and is a good base material for producing synthetic mica paper, mica powder, and pearlescent mica. Larger single crystals can also be made into temperature-resistant and corrosion-resistant window materials. Mica ceramics can be made into insulating and high-temperature-resistant skeletons, and can also be made into chlorine pipes and furnace linings for chlorination furnaces. Mica powder can be used in many fields such as high-grade coatings, synthetic diamond rod accessories, and low-hydrogen welding rod accessories.

Such as insulating paper, insulating tape, insulating board, pearl mica powder, mica paper, mica tape, ceramics, coatings, plastics, paints, refractory materials, welding electrodes, aerospace, daily chemical products, and other fillers.

 

Conductive mica powder

Conductive mica powder is based on wet-process muscovite, using nanotechnology, through surface treatment and semiconductor doping treatment, to form a conductive oxide layer on the surface of the substrate, so as to prepare a new type of electronically conductive functional semiconductor pigment (filler) material.

Conductive mica powder is scaly, and its appearance is generally off-white or light gray powder. It has light color, easy to disperse, small specific gravity, heat resistance, high chemical stability, corrosion resistance, flame retardancy, good wave permeability, good conductivity, Features such as low price. It can be used together with color pigments to improve the gloss without affecting its color. It can be used in conjunction with other pigments to make various light-colored, colored, and near-white permanent conductive and anti-static products. Used in coatings can increase the elasticity of the paint film, and its horizontal arrangement in the coating can prevent ultraviolet radiation to protect the paint film, prevent cracking, and prevent water penetration. It can improve the mechanical strength, powder resistance, temperature resistance, fire resistance, water resistance, impact resistance, and durability of the paint film. Especially suitable for anti-static oil tanks.

Conductive mica powder is suitable for almost any environment and occasion that requires conduction and anti-static. Add it to paint, plastic, rubber, adhesive, ink, cement, fiber, and ceramics, and cooperate with other pigments to easily make permanent conductive and antistatic products of various colors such as near white, which can be widely used Various industrial sectors such as petroleum, chemical industry, building materials, electronics, electromechanical, communication, automobile, medicine, papermaking, textile, packaging, printing, shipbuilding, ceramics, aerospace, weapons, etc., as well as the conductive and antistatic fields of people's daily life.

  1. Features of conductive mica powder:

(1) Conductive mica powder has Excellent electrical conductivity.

(2) Conductive mica powder The chemical properties are stable.

(3) Conductive mica powder has a light specific gravity, is easy to disperse, and is not easy to settle.

(4) Conductive mica powder Light color, easy to mix.

  1. Technical indicators:

No.

Conductive mica powder

Appearance

light gray powder

Physical properties Odorless

non-toxic, non-flammable, non-radioactive

Heat resistance

Stable below 600°C

Chemical resistance

Acid resistance, alkali resistance, light resistance, organic solvent resistance, non-oxidation, flame retardant.

Chemical composition

Mica,SnO2,Sb2O3

Resistivity, Ω.cm, <

100

Particle shape

Flake

Particle size,um

< 15 (800 mesh)

Density,g/cm

3.4~3.6

Apparent density,g/100cm

30~32

Specific surface area,m/g

35~45

Oil absorption,g/100g

70

Moisture,%(m/m),<

2

Water suspension pH

5.0~7.0

 

      3.  Main points and application fields of conductive mica powder:

      a.Key points of use: It can be dispersed at high speed, and ball milling, sand milling, etc. cannot be used.

      b..Application fields: antistatic coating, antistatic plastic and rubber, antistatic fiber, adhesive industry, and other fields (such as papermaking and toner, etc.).

      c.Generally, 20-30% of the total weight is added, and the resistance can reach: 105-106Ω·cm. Please confirm the specific amount by experiment.

The basic application of conductive mica powder in coatings:

        4.Conduction mechanism:

The conductive powder is evenly mixed into the insulating resin, and the conductive powder must be in contact with each other or close to form an infinite link in the coating so that the coating has the function of an electronic channel.

The conductive powder can be easily dispersed in the resin. And the following methods can be used to improve the dispersion effect.

(1) Increase the stirring speed and properly increase the resin stirring temperature.

(2) Add a dispersant to enhance the affinity between Conte conductive powder and organic polymer. When it is mixed with traditional pigments, the traditional pigments should be evenly dispersed and ground before adding Conte conductive powder for stirring.

(3) Two-roll and three-roll grinding can be used, but the grinding fineness must be greater than 60 μm. Ball mills, sand mills, etc. cannot be used.

     5.Main points of conductive mica powder used in epoxy antistatic industrial ground coatings

      a.Formula

Epoxy floor coatings are generally two-component room-temperature curing coatings, which are divided into two categories:

(1) Solvent-free epoxy floor coating is also called solvent-free epoxy self-leveling coating, which can be divided into ordinary type and anti-static type. Its VOC content is low and can meet the environmental protection requirements of the world today. The construction method is generally trowel coating.

(2) Solvent-based epoxy floor coatings, which are also divided into ordinary type and anti-static type, have high VOC content, but the cost is lower than solvent-free type, and the construction method is generally roller coating or spraying

The anti-static floor coating system can be divided into primer, middle coat, and top coat according to the construction sequence. Its composition generally includes film-forming substances, conductive fillers, coloring pigments, solvents, and additives. Film-forming substances, including epoxy resin and curing agents, are the basic factors that determine the performance of coatings, so their selection is very important. The epoxy resin is mainly bisphenol A type; the choice of curing agent should not only meet certain performance requirements but also meet the environmental and construction requirements, such as meeting the environmental curing requirements of different temperatures and a certain effective use time; It is the most demanding variety in the epoxy ground coating system. Compared with the primer and intermediate coating, it is more particular about material selection and formula processing.

       b.Construction

The construction of anti-static floor coatings can generally be divided into the following five processes:

(1) Closed primer: roll or spray on the treated plain ground, ensure uniform coating, completely seal the back, and prevent leakage;

(2) Leveling coating: generally scrape coating or trowel coating, the purpose is to fill up the pits, seams, and other defects on the plain ground;

(3) Attach copper tape: connect it to the ground wire specified by the manufacturer;

(4) Anti-static intermediate coating: generally scrape coating or trowel coating to improve the conductivity of the system and level the copper strip;

(5) Anti-static surface coating; self-leveling type is generally scraped and troweled, and the thickness should be ≤1mm in general (the conductivity decreases with the increase of thickness); solvent type is generally rolled or sprayed in two coats.

 

Phlogopite

The chemical formula of phlogopite is KMg3[AlSi3O10][F, OH]2. Because of its different physical and chemical properties from muscovite, it has many special functions and is used in many important fields. It is mainly used in the industry for its high electrical insulation and heat resistance, as well as its strong acid, alkali, compression, and stripping properties, and is used as an insulating material for electrical equipment and electrical equipment.

Phlogopite is usually yellow, dark brown, or black, with glass luster, and the cleavage surface is pearly or semi-metallic. Phlogopite can be corroded by concentrated sulfuric acid and can be decomposed in concentrated sulfuric acid to produce a milky solution at the same time. Chemical composition Among them, sodium, calcium, and barium are used to replace potassium; titanium, Fe, manganese, and chromium are used to replace magnesium; fluorine is used to replace OH. Distinctive properties beget distinctive uses.

biotite

The chemical composition of biotite: K(Mg, Fe2+)3(Al, Fe3+)Si3O10(OH, F)2, is widely replaced by the same kind of substance, so the chemical composition of biotite produced in different rocks is different very big. Generally, biotite in acidic and alkaline magmatic rocks has high FeO and low MgO; biotite in basic and ultrabasic rocks has high MgO and low FeO; biotite in alkaline pegmatites has low MgO and Fe2O3 is relatively higher.

The crystal form of biotite is the same as that of phlogopite. The color is black, dark brown, sometimes with reddish, greenish, or other hues. Those with high titanium content are light reddish brown, while those rich in high-valent iron are green. Transparent to opaque. Glass luster, black has a semi-metallic luster. Hardness 2-3, specific gravity 3.02-3.12. Biotite can be altered into other minerals such as chlorite, muscovite, and sericite by the action of a heated aqueous solution. Biotite is far inferior to muscovite because of its high iron content and poor insulation performance. Biotite flakes are often used as building material fillers. Biotite with larger particle size is very easy to identify according to its flake shape, darker color and elasticity, complete cleavage of mica, and slightly magnetic characteristics after heating. In plutonic and epitomic rock clocks, Especially in acidic or alkaline rocks, most of them contain biotite.

 

Sodium mica

Sodium mica (Paragonite) is a kind of hydrated sodium aluminum silicate. It is a kind of mica, which often coexists with muscovite, and can be distinguished from it by its physical properties. The difference between the two types of mica lies in their chemical composition. In sodium mica, sodium ions occupy the structural positions of potassium in muscovite.

Lepidolite (Lepidolite)

The chemical composition of lepidolite is K(Li, Al)2.5-3 [Si3.5-3Al0.5-1O10 ](OH, F)2, and lepidolite is Li-rich in the two isomorphic series of Al-Li and Fe-Li For members at one end, the Al-Li series is an incomplete isomorphism, while the Fe-Li series is a complete isomorphism. The analysis data proves that all mica containing Li contains a certain amount of F. The higher the Li content, the higher the F content.

Lepidolite has mica-like cleavage and a purple-to-pink color. When melting, it can foam and produce deep red lithium flame. Insoluble in acid, but can also be affected by acids after melting.

Lepidolite, also known as scale mica, is generally a flake or scale-like aggregate. Spherical lepidolite is produced in Lushi County, Henan, my country, which is a special form. It is rose, light purple, and sometimes white, becoming dark brown when weathered. transparent. Vitreous luster, pearly luster on the cleaved surface. Hardness 2-3. Specific gravity 2.8-2.9. The flakes are elastic. It is one of the main raw materials for extracting rare metal lithium. Lepidolite often contains rubidium and cesium, and it is also an important raw material for extracting these rare metals.

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