[Chemical composition] Al can be replaced by a small amount of Fe 2+ , Fe 3+ , Mg 2+ , and a small amount of Al-substituted Si. Sometimes it contains a small amount of K, Na, and Ca, and their position in the pyrophyllite is not clear, and may exist between the structural unit layers to compensate for the shortage of positive charges generated by Al-based Si. They also suggested that the surface adsorption of ions, or containing a small amount of inclusions caused by white mica. [Crystal Structure] Pyrophyllite has two types: monoclinic and trigonal. Single oblique multi-type (2M) is more common; [Form] Good crystal form is rare. It is often a leaf-like, scaly or cryptocrystalline dense block, sometimes a radial leaf-like aggregate (Figure G-44). Figure G-44 Radiation leaf-like aggregate of pyrophyllite [Physical properties] white, light green, light yellow or light gray; glass luster, dense block is oily luster, cleavage surface is pearl luster. The cleavage {001} is extremely complete; the cryptocrystalline dense block has a shell-like fracture. Hardness 1 to 1.5. The relative density is 2.65 to 2.90. It has a slippery feel and the cleavage sheet is flexible. [Origin] and pyrophyllite occurrence extrusive rocks often acidic Al-rich, acidic or tuff by hydrothermal from junction metamorphic chips, but also in the epithermal gold-containing quartz veins. Our Fujian Shoushan, Qingtian pyrophyllite and other places, the Department of Cretaceous rhyolite and rhyolitic tuff formed by hydrothermal alteration. [Identification characteristics] Similar to talc , the difference method is shown in the talc section. [Main use] Basically the same as talc. In addition, pyrophyllite has a long history in the engraving process and seal making.
Gravity Ore Processing Plant or Ore washing plant is a relatively environmental solution compared to Flotation Process, this solution is to separate the ore from its gangue by gravity differences. After grinding and classifying, the ore is liberated from the gangue, but their gravity is different, so the ore can be separated by adding water. From the introduction we can find that gravity ore dressing solution mainly used to mines with heavy specific gravity in water, sometimes it can be used for pre-processing to remove some impurities, such as clay, to increase the efficiency and higher concentrate grade.
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a 0 = 0.515 nm, b 0 =0.892 nm, c 0 = 1.895 nm; β = 99° 55'; Z = 2; slanting polytype (1Tc): Ci1-P1; a 0 = 0.517 nm, b 0 = 0.896 nm, c 0 = 0.936 nm; α = 91 ° 12', β = 100 ° 24', γ = 90 °; Z = 2. The TOT type, the octahedral sheet is composed of an [AlO 4 (OH) 2 ] octahedron and is a dioctahedral type.
Al 2 [Si 4 O 10 ](OH) 2