The role of stone powder in protecting skin and mucous membranes. Because talcum powder has small particles and a large total area, ultrafine talcum powder can absorb a large amount of chemical irritants or poisons. Therefore, it can have a protective effect when spread on the surface of inflamed or damaged tissues; In addition to protecting the inflamed gastrointestinal mucosa and exerting antiemetic and antidiarrheal effects, it can also prevent the absorption of poisons in the gastrointestinal tract. Talc is not completely harmless. It can cause granulomas in the abdomen, rectum, and vagina.

The antibacterial effect of talc powder uses the plate method to make the culture medium contain 10% talc powder, which has an inhibitory effect on typhoid and paratyphoid. The use of the paper rule only has a mild antibacterial effect on meningococcus.

Jet mills used in industry include disc-type jet mills, fluidized-bed jet jet mills, and circulating tube jet mills.

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

Talc blocks-crushing (hammer crusher)-high-speed mechanical impact superfine crusher-

Turbine Fine Grading Machine-Cyclone Aggregate-Packaging

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

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

Surface modification Talcum powder is widely used as a reinforcing filler for polymer-based composite materials such as polypropylene and nylon. Surface modification of it can effectively improve the affinity between talc and polymer and the dispersion state of talc filler in the polymer matrix, thereby improving the physical and mechanical properties of the composite.

The surface modifiers used for the surface modification of talcum powder mainly include various surfactants, paraffin, titanate and zirconium aluminate coupling agents, silane coupling agents, phosphate esters, and the like.

Modification mainly adopts dry modification process. The modification machines mainly include continuous and fluidized modification machines, continuous vortex powder surface modification machines (SLG type), and high-speed heating mixing kneaders.

The reason for calcination is that some talc ore contains more organic carbon. In order to develop and utilize these black talc resources, calcination is a necessary processing technology. The calcination temperature is generally 600-1200 ° C. In this temperature range, the higher the temperature, the higher the whiteness of the talc after calcination, and the higher the calcined whiteness can be above 90%. At present, most of the calcining equipment use shuttle kiln, tunnel kiln and rotary kiln.