Silicon ash powder

Appearance of silica fume: silica fume is white microstrip gray, red, lamellar, radial or fibrous aggregate, triclinic crystal system, glassy luster, deconstructed mask pearl luster.

The chemical formula of silica fume is CaSiO3, theoretical chemical composition: cao 48.25%, SiO251.75%. Pure wollastonite is rare in nature. During its formation, Ca is sometimes partially replaced by Fe, Mn, Ti and Sr plasma, presenting a plasmoid isomer, mixed with a small amount of Al and micro K and Na.

Due to the difference in temperature, pressure and other conditions during the formation of wollastonite, three kinds of homogeneous polymorphisms may appear. 2. ZM type parastolite with single oblique chain structure, commonly known as parastolite; 3. Pseudosiliceous limestone with triclinic ternary ring structure, commonly known as pseudosiliceous limestone. At present, low temperature triclinal silica limestone is widely used as industrial mineral raw materials. Low temperature triclinal limestone is a triclinal crystal system, most of which are acicular, fibrous or lamellar, often clustered in a fan, radiative assembly, some in a small granular form. Microstrip grey, red, white glass luster, cleavage surfaces appear pearly luster, cleavage parallel medium, at 1125 degrees can be converted into false wollastonite, thermal expansion coefficient increase at this moment, and due to the release of the impurities such as Fe, Sr, so the color from white to cream, red or brown.

The natural types of wollastonite are usually skarn type ore and wollastonite quartz calcite type ore. The former is mainly produced in skarn type deposits with complex mineral components and often associated quartz, calcite, diophanite, garnet and other skarn minerals. The latter mainly from contact metamorphism and regional metamorphism type ore deposit, mineral composition is simple, and can be divided into: wollastonite quartz, wollastonite calcite and wollastonite - quartz - calcite type three sub-types. Wollastonite ore structure usually has two kinds: the density lump ore with fine grained granite crystalloblastic or fiber blastic texture, dense block structure, wollastonite is small granular, columnar or fibrous collection, individual grain density is very fine jade; Coarse-grained siliceous limestone ore with fibrous crystalloblastic texture, massive, gravel-like, macroporphyritic, or striate structure, large siliceous limestone crystals, plate-columnar, fascicular or radial (chrysanthemum).