从工业硅渣中回收硅和铝的研究
收稿日期: 2022-11-09
网络出版日期: 2023-09-19
Study on recovery of silicon and aluminum from industrial silicon slag
Received date: 2022-11-09
Online published: 2023-09-19
罗文波 , 李恒 , 吕钧 , 杨林光 , 赵兴凡 , 龙潇 . 从工业硅渣中回收硅和铝的研究[J]. 无机盐工业, 2023 , 55(9) : 94 -99 . DOI: 10.19964/j.issn.1006-4990.2022-0664
The industrial silicon slag is mainly composed of silicon,aluminum,calcium ternary oxides and a small amount of silicon.The content of other impurities is extremely rare.It can be used as the raw material for high-quality molecular sieve.Sodium silicate and sodium aluminate solution were extracted from industrial silicon slag by "baking soda alkali leaching" process.The effects of calcination time,calcination temperature and sodium carbonate addition on the leach rate of silicon and aluminum were investigated.The results showed that under the optimum conditions of calcination temperature of 800 ℃,calcination time of 30 min and 1.1 times of the theoretical amount of sodium carbonate,the conversion rate of silicon and aluminum was high,and the leach rates of silicon and aluminum in alkali leaching were 82.34% and 67.10% respectively.The process was feasible,which solved the problem of industrial silicon waste residue stockpiling and brings considerable economic benefits.
Key words: industrial silicon slag; sodium silicate; sodium aluminate; soda roasted; leaching
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