预脱硅分选拜尔法新工艺的理论依据和工业化技术

THEORETICAL BASIS OF NEW TECHNOLOGY IN PREDESILICIFICATION AND BAUXITE DRESSING-BAYER PROCESS AND INDUSTRY TECHNIQUE OF NEW TECHNOLOGY

预脱硅分选拜尔法新工艺是我国首次提出的氧化铝工业生产新工艺 ,本文关于预脱硅过程中铝矿物和硅矿物互相解离的研究为新工艺的形成提供了理论依据 ,关于不同温度下生成的水合铝硅酸钠在常压下与石灰反应特性的研究为新工艺的技术经济评价提供了理论依据 ,还对磨矿过程中铝土矿过磨问题和机械分选时细微粒矿物分级等关键技术进行了试验研究 ,论述了新工艺工业化实施的途径 .

Predesilicification-bauxite dressing-Bayer process is a new technical process in alumina industry proposed firstly in the world. The study on the disaggregation between alumina mineral and silica mineral in the predesilicification presents the theoretical basis for the new process. The study on the different reaction features of hydrated sodium aluminosilicate produced in different temperature with additive lime in atmospheric pressure provides the theoretical basis for its technical and economical feasibility. Some key techniques such as avoidance of bauxite over grinding and gradation of the small particles in bauxite dressing are investigated. The method of the new process in use is mentioned.