The talc powder was purified and flotation was carried out by electrostatic separation

How to purify talc powder flotation because of the natural buoyancy of talc. Therefore, hydrocarbon oil collectors can be flotation. The commonly used collector is kerosene, the flotation oil as the foaming agent. The foam produced by methyl isobutyl methanol (MIBC) is more brittle and easy to obtain high quality concentrate. The floatation process of talc is simple, and the final concentrate can be obtained by only one roughing, one sweep and two or four handpicking.

Hand runners are selected by hand according to the slimy properties of talc and gangue minerals. Talc has good slimy property, the higher the grade, the better the slimy property. Most talc mines in China are used to produce high grade talc blocks by hand.

In addition to talc, the talc ore of haicheng powder is selected by static electricity. It also contains magnesite, magnetite, magnetite, diorite and other minerals with microchimeric size of about 0.5mm. Talc has a positive charge in electrostatic field. Magnetite and magnetite are good conductors, so they can be easily separated in electric field.

Magnetic dressing talc concentrate requires a certain fineness. You have to have a certain whiteness. Because the existence of chromatite in ore is sometimes not enough by the above method, it is necessary to remove the iron ore by magnetic separation. Wet magnetic separation can reduce the iron content of talc concentrate from 4-5% to less than 1%.

Photoelectric selective photoelectric detection is a method of separating the surface light properties of talc and impurity minerals. Photoelectric separator includes preparation mechanism (ore bin, feeder, belt conveyor), radiation source and detector (sensor), electronic control circuit and actuator. In addition, the characteristics of white fluorescence produced by talc under ultraviolet radiation are also used.

Many paper mills often encounter quantitative fluctuation and fluctuation of paper ash in the process of copying paper. It brings a lot of trouble to the quality control of production. There are many factors influencing the quantitative fluctuation, among which the unstable filling of talc in paper copy is also a main reason.

Some paper mills directly add talc powder into the mixing pond, which is simple and convenient. Just pour a certain amount of dry talc powder into the mixing tank and mix with the slurry for a certain period of time. However, because talc has a higher proportion than fiber, talc powder is lost in the process of slag removal and purification of the pulp system of paper machine (commonly used cone slag remover). This not only causes the waste of talc addition and filling, but also makes the paper quantitative, ash difficult to control.

Talcum powder