含碱硅酸钠溶液的回收和利用工艺研究
收稿日期: 2021-04-23
网络出版日期: 2022-03-14
Study on recovery and utilization process of alkali containing sodium silicate solution
Received date: 2021-04-23
Online published: 2022-03-14
韩东 , 张强 , 张敏 . 含碱硅酸钠溶液的回收和利用工艺研究[J]. 无机盐工业, 2022 , 54(2) : 106 -110 . DOI: 10.19964/j.issn.1006-4990.2021-0258
Adding lime as desilication agent,the desilication solution of alkali leaching containing sodium silicate was recov-ered after desilication treatment.The desilication solution was recycled to desilicate high silica bauxite.The effect of calcium/silica ratio,caustic soda concentration,initial silica concentration and desilication time on desilication ratio were investigated,and the effect of recycling desilication was verified under the optimal desilication condition.The results of desilication showed that under alkaline condition[ρ(Na2O)≈100 g/L],the concentration of silica in the solution decreased from about 7 g/L to about 1 g/L after adding lime with calcium silicon ratio of 1.2 for 2 h.The results of cyclic desilication showed that the n(Al)/n(Si) of bauxite was greater than 7 after 5 cycles of alkali liquor.This not only provided theoretical guidance for alumina in-dustrial production,but also provided an effective way for caustic solution recycling.
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