摘要
在烧结杯上模拟带式焙烧机进行了铝土矿的焙烧脱硅试验。结果表明 :采用带式焙烧机焙烧铝土矿是可行的。获得的焙烧工艺条件为 :矿石粒度 0～ 5mm ,焦粉用量 3.4% ,混合料水分 7.5% ,950℃点火 1min ,80 0℃保温 2min ,点火负压 3kPa ,焙烧负压 7kPa。采用苛性碱溶出脱硅 ,焙烧矿脱硅率可达 43.45% ,精矿A/S =8.31。X射线衍射分析表明 :焙烧过程中高岭石发生热分解产生的非晶态SiO2 ,经碱处理后溶于NaOH而被脱除。高压溶出试验表明 :脱硅铝精矿中Al2 O3的溶出率比原矿高。
Using the ore from Sanxi province, the roasting process of the desilication from the diasporic bauxite was studied. It was shown that using rotary kiln as the roasting apparatus is practicable, and the optimum roasting parameters are: grain size 0～20 mm, roasting temperature 1 050～1 100 ℃, roasting time 15～20 min. The alkali leaching results, rate of desilication 55.61% and ratio between aluminium and silicon of the concentrate 9.92, were obtained. By means of XRD analysis, the following conclusions were reached: only Si, existed in kaolinite, could be changed into noncrystalline silica; during the leaching, this kind of silica is dissolved by NaOH solution, but α silica does not dissolve, so it is not contributive to desilication. The digestion of the concentrate by Bayer process also showed that the digestion ratio of Al 2O 3 of the concentrate is higher than that of raw ore.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2000年第5期705-709,共5页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展规划项目! ("973"计划 ) (G1 9990 6490 1 )
