Talc 2019-11-18 17:02:59

Introduction Of Talc

Talc is a hydrothermal alteration mineral. Magnesium-rich minerals often become talc after hydrothermal alteration, so talc is often a mineral illusion such as olivine, pyroxene, hornblende, and tremolite. Talc is a common silicate mineral that is very soft and has a slippery feel. Ten minerals have been selected to represent 10 hardness levels, called Mohs hardness. Of the 10 levels, the first (ie the softest one) is talc. Soft talc can be used to replace white chalk. Talc is generally in the form of a block, a blade, a fiber or a radial, and the color is white, grayish white, and may be colored in various colors due to other impurities. There are many uses for talc, such as refractory materials, paper making, rubber fillers, pesticide absorbents, leather coatings, cosmetic materials and engraving materials.

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Name: talc

Hardness: 1

Category: silicate minerals

Chemical formula: 3MgO·4SiO2·H2O, Al2O3, FeO/MgO

Specific gravity: 2.6-2.8

Color: white or various light colors

Ultra-fine talcum powder is one of the most used ultra-fine powder products in the world, widely used in paper, plastic, rubber, paints, cosmetics, ceramics and so on.

At present, the processing of ultrafine talcum powder mainly adopts a dry process. Although wet pulverization has been studied, it is rarely used in industry. Dry production equipment mainly includes high-speed mechanical impact mills, jet mills, centrifugal self-grinding mills, rotary mills, and vibration mills, mixer mills and tower mills. In addition to the jet mill, in order to meet the requirements of the particle size distribution, other sorting equipment generally needs to be equipped with fine grading equipment. The commonly used fine grading equipment is various turbine air centrifugal classifiers, such as MS type, MSS type, ATP type. , LHB type, etc.

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Fineness use Equipment recommendation
Below 200 mesh Used for various feeds, such as fish feed, etc., also used as other additives; MTM、MTW、LM
200 mesh - 325 mesh Drilling, papermaking, etc. MTM、MTW、LM
More than 325 mesh Chemical additives, paper SCM and LUM

The principle of airflow pulverization of talc is as follows:

Talc block → coarse crushing → drying → medium crushing → fine grinding (Raymond mill) → ultrafine crushing (airflow mill) → cyclone aggregate → packaging.

The production process is roughly that the talc is first sent to the hammer crusher by the feeder for crushing; the crushed material is dried by the bucket elevator and the vibrating feeder into the vertical dryer; the dried material is hammered again. After the crusher is broken, it enters the Raymond mill fine grinding; the finely ground talc powder enters the jet mill for ultrafine crushing. The final product fineness can reach 500 to 5000 mesh (d97 = 30 to 5 mm). The jet mills used in the industry include disc-type jet mills, fluidized bed-to-jet jet mills, circulating tube mills, and the like.

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The high-speed mechanical impact superfine pulverization process of talc is as follows:

Talc block → crushing (hammer crusher) → high-speed mechanical impact type superfine crusher → turbine fine classifier → cyclone aggregate → packaging.

Generally, the talc is crushed to 8 mm and directly fed into a mechanical impact type ultrafine pulverizer. The pulverized product is classified by a turbo fine classifier and then collected by a cyclone collector. The graded coarse-grained product can be returned to the mill or used alone as a product.

The centrifugal self-grinding of the talc and the ultrafine grinding process of the rotary mill are generally similar to the high-speed mechanical impact superfine grinding process.

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