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What is Wollastonite?

Wollastonite is a triclinic, thin plate-like crystal, aggregates were radial or fibrous. The color is white, sometimes with light gray, light red color with glass luster, cleavage surface with pearl luster. Hardness is 4.5 to 5.5; density is 2.75 to 3.10g/cm3. Completely soluble in concentrated hydrochloric acid. Under normal circumstances is acid, alkali, chemical resistance. Moisture absorption is less than 4%; low oil absorption, low electrical conductivity, good insulation. Wollastonite is a typical metamorphic mineral, mainly produced in acid rock and limestone contact zone, and Fu rocks, garnet symbiotic. Also found in the deep metamorphic calcite schist, volcanic eruption and some alkaline rocks. Wollastonite is an inorganic needle-like mineral, characterized by non-toxic, chemical corrosion resistance, good thermal stability and dimensional stability, glass and pearl luster, low water absorption and oil absorption, mechanical properties and excellent electrical properties and a certain Reinforcing effect. Wollastonite products is long fiber and easy separation, low iron content, high whiteness. The product is mainly used for polymer-based composites reinforced filler. Such as plastics, rubber, ceramics, coatings, building materials and other industries.

Usage of Wollastonite
In the ever-changing technology today, wollastonite industry has developed by leaps and bounds, the world's main use of wollastonite is the ceramic industry, and it can be used as plastic, rubber, paint, functional fillers in paint field. At present, China's main consumption area of wollastonite is ceramic industry, accounting for  55%; Metallurgical industry accounted for 30%, other industries (such as plastic, rubber, paper, paint, welding, etc.), accounting for about 15%. 
1. Ceramic industry: Wollastonite in the ceramic market is very mature, widely used in the ceramic industry as the green body and glaze, makes the green body and glaze from crack and easy break, no cracks or flaws, increase glaze surface gloss degree.
2. Functional filler: High purity wollastonite used as inorganic white pigment is widely used in coatings, can replace some of the expensive titanium dioxide.
3. Asbestos substitutes: Wollastonite powder can replace some asbestos, glass fiber, pulp, etc., mainly used in the fire board and cement materials, friction materials, indoor wall panels.
4. Metallurgical flux: Wollastonite can protect molten steel not been oxidized under molten state and high temperature, widely used in the metallurgical industry. 
5. Paint: Adding wollastonite paint can improve the physical properties, durability and resistance to climate, reduce the aging of the paint.
Model selection and technological process in Wollastonite powder processing

 Wollastonite ingredients analysis sheet

48.25% 51.75%

Wollastonite powder making selection program 

Specification (mesh)Ultrafine powder processing(20—400 mesh)Deep processing of ultrafine powder(600--2000mesh)
Equipment selection program Vertical mill or pendulum grinding mill Ultrafine grinding roller mill or ultrafine vertical grinding mill


Analysis on grinding mill models

1, Raymond Mill, HC series pendulum grinding mill: low investment costs, high capacity, low energy consumption, equipment stability, low noise; is the ideal equipment for wollastonite powder processing. But the degree of large-scale is relatively lower compared to vertical grinding mill.

2, HLM vertical mill: large-scale equipment, high capacity, to meet the large-scale production demand. Product has high degree of spherical, better quality, but the investment cost is higher.

3, HCH ultrafine grinding roller mill:ultrafine grinding roller mill is efficient, energy-saving, economical and practical milling equipment for ultrafine powder over 600 meshes.

4, HLMX ultra-fine vertical mill: especially for large-scale production capacity ultrafine powder over 600 meshes, or customer who has higher requirements on powder particle form, HLMX ultrafine vertical mill is the best choice.

Wollastonite powder processing technological process

Phrase one: raw material crushing
Wollastonite blocks will be crushed to 15mm-50mm fineness by crusher.

Phrase two: grinding
Crushed wollastonite blocks will be sent to the storage hopper by elevator, and then sent to main mill for grinding through feeder.

Phrase three: classifying
Ground material will be classified, coarse powder will fall back to the main mill for ground again.

Phrase four: end product collecting
Qualified powder will flow with the air and be collected by dust collector, then the finished powder will be transported to the product storage bin through discharge port. Finally, powder will be loaded by tank car or packed by packing machine.

We offer full set of calcite powder processing solution to convoy your calcite powder project!

Learn more about powder processing integration service

Application examples of Wollastonite powder processing

Some wollastonite processing enterprise

Material: Wollastonite

Fineness: 200mesh D97

Capacity: 6-8t/h

Configuration: 1 set of HC1700

Customer feedback:

Guilin Hong Cheng wollastonite mill has reliable quality, excellent performance, smooth operation; long service life, grinding roller and grinding ring are made of special wear-resistant material, more wear-resistant, saving us a lot of maintenance costs. Hong Cheng research and development, sales, maintenance and other team of engineers dedicated to their due, diligence and dedication to serve my company's wollastonite milling production line to provide professional milling technology and equipment.

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