Understanding of wollastonite beneficiation process

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Wollastonite belongs to a chain of metasilicate, which is fibrous and needle-like, and its special crystal morphology also determines its properties. Wollastonite has good insulation, high whiteness, good dielectric properties and high heat and weather resistance. Therefore widely used in ceramics, chemicals, metallurgy, paper making, plastics, paint and so on. In this article, we will take a closer look at the wollastonite beneficiation method.

At present, the main methods of wollastonite beneficiation at home and abroad are hand-selected, single magnetic separation, flotation, magnetic separation-flotation (or electric selection) combined processes. The main purpose of mineral processing is to reduce iron content and separate calcite .

First of all, the hand selection is the manual selection of wollastonite rich ore blocks in the mining site, and the hand selection is suitable for the better quality wollastonite ore. The single magnetic separation is based on the main associated minerals in wollastonite rocks such as diopside and garnet , which are weak magnetic minerals, and wollastonite does not show magnetic properties. Therefore, dry or wet magnetic separation technology can be used. By separating the wollastonite from it, a large amount of iron-containing minerals can be separated to improve the purity of the product. Wollastonite single flotation is based on the difference in physical and chemical properties of wollastonite and calcite minerals. It can be effectively separated from each other by flotation, thereby improving the purity of wollastonite products.

Another method of wollastonite beneficiation is the magnetic separation-flotation combined process, which is suitable for the treatment of low grade wollastonite. The weak magnetic mineral is first separated by dry or wet magnetic separation. The wollastonite is then separated from the minerals such as calcite and quartz by flotation.

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