Wollastonite is a kind of chain metasilicate, which is fibrous and acicular.Wollastonite has good insulation, high whiteness, good dielectric properties and high heat and weather resistance.Therefore, it is widely used in ceramics, chemical industry, metallurgy, papermaking, plastics, coatings and other fields.
The ceramic grade wollastonite powder can greatly reduce the firing temperature and shorten the firing time by adding the right amount of wollastonite powder to the ceramic raw material, so as to realize the low temperature rapid firing.Large amount of fuel saving, significantly reduce product costs;At the same time, improve the mechanical properties of the products, reduce the cracks and warping of the products, increase the glaze luster, improve the strength of the embryo body, and improve the pass rate of the products.
Wollastonite is widely used in automobile, metallurgy, ceramics, plastics and other industries.Among them, the most promising area for wollastonite consumption in the world is the engineering plastics industry. As the filler and reinforcing agent for the plastics and rubber industry, wollastonite is increasingly replacing metal parts in the manufactured products, and the market demand for it is growing rapidly.
Potential new USES for wollastonite are being discovered due to the improvement of processing methods and the acquisition of ultrafine materials.According to foreign experts, the proportion of wollastonite application in the future is as follows: ceramic industry and related departments 6%;Paints, plastics and decorative materials 22%;Asbestos substitutes 5%;El 12% insulation ceramic foam for ordinary household insulation;Insulation ceramic foam for building 6%;Refractory insulating layer ceramic foam 2%;Ceramic foam for casting production 4%;Slag concrete block surface coating 3%;Paper production is 40%.
At present, the main methods of wollastonite separation at home and abroad are manual separation, single magnetic separation, flotation, magnetic separation - flotation (or electrical separation) combined process.The main purpose of ore dressing is to reduce iron content and separate calcite.
First of all, manual selection is the manual picking of wollastonite rich ore block in the stope, and manual selection is suitable for the wollastonite ore with better quality.The single magnetic separation is based on the main associated minerals in wollastonite rocks such as diopside
Wollastonite and garnet are weakly magnetic minerals, while wollastonite shows little magnetism. Therefore, dry or wet strong magnetic separation technology can be used to separate wollastonite from them to separate a large amount of iron ore
Material, improve product purity.Single flotation of wollastonite is based on the difference of physical and chemical properties between wollastonite and calcite mineral surface
The purity of the product.
There is also a method of wollastonite dressing, which is the combined process of magnetic separation and flotation. This method is suitable for the treatment of low-grade wollastonite.Weak magnetic minerals are first separated by dry or wet magnetic separation.Then wollastonite is separated from calcite, quartz and other minerals by flotation method.
