Sulfur Removal of High-Sulfur Bauxite

Sulfur Removal of High-Sulfur Bauxite
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高硫铝土矿脱硫

DOI:
10.1007/s42461-020-00225-6
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发表时间:
2020-06
期刊:
Mining, Metallurgy and Exploration
影响因子:
--
通讯作者:
Xiong Ping
Xiong Ping
中科院分区:
其他
文献类型:
--
作者:
Liu Zhanwei;Yan Hengwei;Ma Wenhui;Xiong Ping

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高硫铝土矿中的硫不仅污染环境,而且不利于氧化铝生产。本研究研究了在拜耳法中添加 Zn 或 ZnO 来去除高硫铝土矿中的硫。结果表明,在消解过程中添加Zn可以有效去除铝酸钠溶液中的不同价态硫(S2−、S2O32−、SO32−和SO42−)。添加 ZnO 可以去除液体中的 S2−,但其他硫化合物(S2O32−、SO32− 和 SO42−)不受影响。其脱硫机理已被阐明,其中S2O32−、SO32−和SO42−首先被还原为S2−,添加Zn后,S2−以ZnS的形式进入赤泥中。然后 ZnO 与 S2− 反应生成 ZnS,进入赤泥中。因此,在消化过程中添加锌是一种新的、有效的脱硫方法。研究结果为氧化铝生产过程中从高硫铝土矿中脱硫提供了线索。
The sulfur in high-sulfur bauxite not only pollutes the environment but also harms alumina production. This study investigated the removal of sulfur from high-sulfur bauxite by adding Zn or ZnO during the Bayer process. The results showed that the different valence sulfur (S2−, S2O32−, SO32−, and SO42−) in sodium aluminate solution can be effectively removed by adding Zn during the digestion process. Adding ZnO removes the S2−in liquor, but the other sulfur compounds (S2O32−, SO32−, and SO42−) are not affected. The mechanism of sulfur removal has been elucidated, where the S2O32−, SO32−, and SO42−are first reduced to S2−, and after adding Zn, the S2−enters into red mud in the form of ZnS. The ZnO then reacts with S2−to generate the ZnS that enters into red mud. Thus, this is a new and effective method of sulfur removal by adding Zn during the digestion process. The results shed light on the removal of sulfur from high-sulfur bauxite during alumina production.
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发表时间: 2013-08
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