Rich bauxite resources in China, but has high aluminum, high silica, low iron, lower than the aluminum-silicon features, most advanced ore can not meet the requirements of Bayer alumina production craft. At present, the production of alumina in China mainly adopts the hybrid method and the sintering method, and faces the problems of high production cost, high energy consumption and environmental pollution, and the products lack international competitiveness. In order to solve the problem of the utilization of China's 2.3 billion tons of bauxite resources and the challenges after China's accession to the WTO, the national “Ninth Five-Year Plan†proposed a new technology for the production of alumina by the mineral processing and Bayer process, and it has achieved initial success. The positive flotation desiliconization technology developed can obtain high alumina to bauxite concentrate for alumina production. The National Key Basic Research and Development Program (973) and the National “Tenth Five-Year Plan†further proposed the basic research and technology development of anti-flotation desiliconization as a key topic. In reverse flotation desiliconization, the selective inhibition of diaspore and the enhanced capture of kaolinite are two key technologies. In this thesis, a phosphate diaspore and kaolinite flotation performance. Sodium hexametaphosphate (SHMP) inhibits kaolinite at a lower dosage than that of diaspore, which can achieve positive flotation desiliconization of bauxite; and under high dosage, six The inhibitory effect of metaphosphate on diaspore is very strong, and the inhibition effect on kaolinite is not significantly changed compared with the low dosage condition, so that desiliconization of bauxite can be achieved by reverse flotation. The solution chemistry of phosphate, the effect of sodium hexameta on the potential of diaspore and kaolinite minerals and their adsorption on the mineral surface, and the imaging of mineral particles in solution by microscopy, 6) The mechanism of action in an amine cation reverse flotation system of diaspore and kaolinite.
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