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Study on Application of Grinding Aids in Grinding of Henan Low Grade Bauxite

Author: LuoChunHua
Tutor: HuYueHuaï¼›SunWei
School: Central South University
Course: Mineral Processing Engineering
Keywords: Bauxite Selective grinding Grinding aids
CLC: TD952
Type: Master's thesis
Year: 2008
Downloads: 373
Quote: 1
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Abstract


In this thesis, as the research object to Henan low grade bauxite, investigated ore insert the bout and different grinding conditions of bauxite grinding; different pharmaceutical bauxite grinding aid and selective grinding . By potentiodynamic and IR detection means for grinding aid mechanism was discussed. Embedded Butte ore, we know, the diaspore crystal structure dense siliceous gangue minerals and kaolinite, illite disseminated closely related. A diaspore embedded Bute, determines the fineness of grinding. The same time, the hardness of minerals, cleavage and rock and mineral structural defects, etc. affect the the bauxite crushing behavior, selective grinding of mineral. Add test conditions by grinding and grinding aids: the ball medium size and ratio, time of grinding and grinding concentration and other conditions of bauxite grinding have a greater impact; anhydrous sodium carbonate, sodium hexametaphosphate RC bauxite-0.075mm grain size the better grinding aid, when grinding concentration of 80%, compared with the Pharmacy without grinding fineness were increased by 9.23%, 11.47%, 9.74% . Aluminum-silicon analysis showed that adding Pharmacy the bauxite grinding coarse Al-Si minerals are improved, seen with pesticides, have some selective grinding of the bauxite strengthening effect. The grinding aids Mechanism of: anhydrous sodium carbonate, sodium hexametaphosphate and RC absolute value by changing the surface potential of the mineral change the rheological properties of the slurry to improve the grinding efficiency; enhanced rheological properties at the same time, weakening the hard and soft minerals \Due to the structural differences between the diaspore minerals and aluminum silicate minerals, pharmaceutical presence of physical or chemical adsorption on the mineral surface, the crack of aluminum silicate minerals over a diaspore more easily broken, and strengthen its selective grinding. Sodium hexametaphosphate to change the the bauxite particles surface roughness, help to change the fluidity of the slurry; without significant voids and cracks in the surface of the particles, reducing the sodium hexametaphosphate in the mineral surface was found by scanning electron microscopy, the surface of the mineral particles can promote cracks and fracture defects. By XRD analysis showed that urea may be accelerated by the role of intercalation kaolinite layered structure of silicate minerals crushing speed, enhanced selective grinding of the bauxite.

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CLC: > Industrial Technology > Mining Engineering > Beneficiation > Metallic Ore Dressing > Nonferrous metal ore beneficiation
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