Research On Leaching Function Of High Grade Bauxite Containing Sulfur Of Guizhou

There are abundant resources of bauxite ore in our country .The total sum of high grade bauxite containing sulfur is 57.2% ,and more than 60% of high grade bauxite containing sulfur of Guizhou belongs to this ore ,the Bayer pressure is applicable to handle this ore .It will reduce the burden of bauxite resource if we are able to exploit/utilize this kind of bauxite ore efficiently .So first we must resolve the desulfurizing problem of technological process in producing alumina .This paper studies the leaching function of high grade bauxite containing sulfur of Guizhou according to the high-pressure digestion theory of the diaspore bauxite .As far as working procedure segment of Bayer method is concerned , in order to reduce the desulfurizing burden of digested slurry , the quantity of desulfurization and the cost of desulfurizing, we must control suitable high-pressure digestion condition .Under the premise of gaining the high yield of Al₂O₃,we should try our best to keep the sulfur out of liquid .So it is necessary for us to study the leaching function of high grade bauxite containing sulfur deeply .Discussing the effect parameters of leaching ratio among the four influencing factors : alkali-consistency , leaching-temperature , alkali-consistency and leaching-time , the optimal analysis about the digestion of Guizhou high grade bauxite containing sulfur adopting orthogonal cross-course analysis have been made , the mathematic model of optimal digestion condition have been found and the suitable condition of leaching technology have been gained .It's optimum conditions are that leaching-temperature is 260℃,alkali-consistency 195 g/l , CaO 12 % and leaching-time 50min. In this optimum condition, the yield of Al₂O₃ reaches no less than 88 %±, the yield of sulfur reaches no more than 13 %±. Thus all this can offer reference to efficiently using high grade bauxite containing sulfur of Guizhou in producing.At the same time , this paper studies the leaching function of bauxite containing different amount of sulfur under the given conditions and the depositing ability of diluted Bayer process's digested slurry .The result points out: the leaching-temperature affect the digestion rate greatly , the following is the quantity of lime , leaching-time and alkali-consistency affect the digestion rate smaller ; sulfureous leaching rate is lower when sulfur of bauxite ore is the middle content ; the depositing ability of diluted digested slurry is good and compressed L/S is small .