Sulfur removal by adding aluminum in the bayer process of high-sulfur bauxite
Sulfur removal by adding aluminum in the bayer process of high-sulfur bauxite
复制标题
高硫铝土矿拜耳法加铝脱硫
DOI：
10.1016/j.mineng.2018.01.030
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发表时间：
2018-04-01
影响因子：
4.8
通讯作者：
Li, Pengfei
中科院分区：
文献类型：
--
作者：
Liu, Zhanwei;Li, Dunyong;Li, Pengfei
本文提出了一种在高硫铝土矿拜耳法生产过程中添加铝的脱硫新方法。详细考察了铝用量对铝酸钠溶液中不同价态硫浓度的影响，发现随着铝用量的增加，铝酸钠溶液中高价态硫（S2 O32-、SO 32-、SO 42-）浓度降低，而S2-浓度增加。这表明在溶出温度下铝与高价硫反应生成低价硫，这与我们的热力学计算结果一致。随着铝用量的增加，硫的溶出率显著降低，氧化铝的溶出率略有降低，而赤泥中硫的含量显著增加。这说明在溶出过程中加入铝可以使铝酸钠溶液中的高价硫转化为S2-进入赤泥。
This paper proposes a novel approach to sulfur removal by adding aluminum in the bayer process of high-sulfur bauxite. The effects of aluminum dosage on the concentrations of different valence sulfur in sodium aluminate solution were investigated at length to find that high-valence sulfur (S2O32-, SO32-, SO42-) concentration in sodium aluminate solution decreases, but the concentration of the S2- in the sodium aluminate solution increases as aluminum dosage increases. This suggests that aluminum reacts with high-valence sulfur to generate low-valence sulfur at digestion temperature, which is consistent with our thermodynamic calculation results. As aluminum dosage increases, sulfur digestion rate decreases notably, and the alumina digestion rate decreases slightly, while sulfur content in red mud markedly increases. This suggests that high-valence sulfur in sodium aluminate solution can be converted to S2- and then enter red mud by adding aluminum during the digestion process.