Talc

What is talc

Talc is a common silicate mineral, which belongs to trioctahedral mineral, and its structural formula is (MG6) [si8] O20 (OH) 4. Talc is a hydrothermal alteration mineral. Magnesium rich minerals are often changed into talc by hydrothermal alteration, so talc often appears as olivine, enstatite, hornblende and tremolite. Talc is one of the minerals. It is buried in the ground together with serpentine which contains asbestos, so it often contains asbestos in natural form. Talc is usually massive, leafy, fibrous or radial. It is very soft and has a greasy feel. The talc is soft, with Mohs hardness coefficient of 1-1.5, with sliding feeling. The cleavage of {001} is very complete, and it is easy to split into thin sections. The natural repose angle is small (35 ° to 40 °), which is very unstable. The surrounding rocks are silicified and slippery magnesite, magnesite, lean ore or dolomitic marble. Except a few medium stable, they are generally unstable. Joints and fissures are developed, and the physical and mechanical properties of ore and surrounding rock are also discussed Quality has great influence on mining technology.

Use of talc

Talc has excellent physical and chemical properties, such as lubricity, adhesion resistance, flow aid, fire resistance, acid resistance, insulation, high melting point, chemical inactivity, good covering power, softness, good luster and strong adsorption. Therefore, talc has a wide range of applications in cosmetics, medicine, papermaking, plastics and other fields.

Cosmetics

For all kinds of moisturizing powder, beauty powder, talcum powder, etc. It has the function of blocking infrared rays, thus enhancing the sunscreen and anti infrared properties of cosmetics.

Medicine food field

It is used as an additive for pharmaceutical tablets, pharmaceutical powder (such as acaphen powder) sugar coating, prickly heat powder, Chinese medicine prescription, food additive, isolation agent, etc. It has the characteristics of non-toxic, tasteless, high whiteness, good compatibility, strong gloss, soft taste and strong smoothness.

Coating field

It is used for white body pigment and various kinds of water-based, oil-based, resin industrial coatings, primer, protective paint, etc. Increase the stability of product shape.

Paper industry

Used for all kinds of paper and paperboard filler, wood asphalt control agent. It can make the paper smooth and delicate, save raw materials and improve the service life of grease net.

Plastics

It is used as filler of polypropylene, nylon, polyvinyl chloride, polyethylene, polystyrene and polyester. Increase tensile strength, shear strength, bending strength, pressure strength, reduce deformation.

Rubber field

It is used for rubber filler and anti adhesion agent for rubber products. Increase the stability of product shape, increase the tensile strength, shear strength, bending strength, pressure strength.

Cable field

Used for cable rubber additive and cable isolation agent.

Ceramic field

It is used to manufacture electric porcelain, wireless electric porcelain, various industrial ceramics, architectural ceramics, daily-use ceramics and glaze, etc. It has the characteristics of no discoloration at high temperature, enhanced whiteness after calcination, uniform density, good luster and smooth surface.

The field of waterproof materials

Used for waterproof membrane, waterproof coating, waterproof ointment, etc.

Technological process of talc milling

The first stage: crushing of raw materials

The large talc material is crushed by the crusher to the feed fineness (15mm-50mm) that can enter the mill.

The second stage: grinding

The broken talc small pieces are sent to the storage hopper by the elevator, and then they are evenly and quantitatively fed into the grinding chamber of the mill by the feeder for grinding.

Stage three: grading

The milled materials are graded by the grading system, and the unqualified powders are returned to the host machine for regrinding after being graded by the classifier.

Stage four: collection of finished products

The powder meeting the fineness will flow through the pipeline into the dust collector for separation and collection. The collected finished powder will be sent to the finished product bin by the conveying device through the discharge port, and then packaged by powder loading tanker or automatic packer.