从硅渣中回收Al_2O_3的研究与实践  

Research and Practice for Al_2O_3 Recovery from Silica Residue

作　　者：郭怀胜 

机构地区：[1]中铝山东分公司氧化铝厂,山东淄博255065

出　　处：《山东冶金》2008年第5期37-39,共3页Shandong Metallurgy

摘　　要：为减少烧结法生产氧化铝产生的硅渣量,在实验室中用正交试验法探讨了溶出温度、液固比、碳酸钠浓度与钙硅渣中氧化铝溶出率的关系,结果表明,固相钙硅渣中Al2O3的溶出率随溶出液固比、溶出温度的升高(100℃以下)而增加,适当延长溶出时间能提高溶出率。在工业实践中,用含Na2OC100g/L的碳分母液溶出混合硅渣,控制溶出液固比9、温度约90℃,搅拌40min,经过滤分离,固相中Al2O3的回收率达29.16%,附液中Al2O3的回收率达57.4%,年降低生产成本434万元。In order to reduce mixed silica residue produced in producing alumina by sinter process, the connections of digestion temperature, liquid-solid ratio, concentration of sodium carbonate and the leaching rate of alumina in calcium silica slag were discussed by orthogonal test in laboratory. The results showed that the leaching rate of alumina in solid phase calcium silica slag increased along with the augment of liquid-solid ratio and digestion temperature and were improved by the extension of digestion time. In industrial practice, the recovery rate of Al2O3 in solid phase reached to 29.16% and the recovery rate of Al2O3 in accreted liquid reached to 57.4% after filtration and separation under the condition of using spent carbonated liquor contained Na2Oc 100 g/L to extract the mixed silica residue, controlling extraction liquid-solid ratio at 9, temperature at about 90℃ and agitating for 40 minutes, then reduced the production cost of 4.34 million RMB per year.

关 键 词：钙硅渣 氧化铝 溶出率 碳分母液 

分 类 号：TF821[冶金工程—有色金属冶金]