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| Plant Practice of Bayer Process without Salt Discharge of High Sulfur and High Carbon Complex Bauxite |
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Received:June 07, 2020
Revised:June 07, 2020
Accepted:June 10, 2020
Published Online:September 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.10.009 |
| KeyWord:Bauxite; sulfur; carbon; Bayer process; sodium carbonate; salt discharge; red mud |
| Author | Institution |
| LI Qi-gui |
（中铝）遵义铝业股份有限公司 |
| LIU Yong-yi |
（中铝）遵义铝业股份有限公司 |
| YIN Zhong-lin |
国家铝冶炼工程技术研究中心/中铝郑州有色金属研究院有限公司 |
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| Abstract: |
| An alumina refinery in Zunyi applies Bayer process to produce alumina with high sulfur bauxite as raw materials. Effect of rising of carbon and alkali in system on production is summarized. The causes of rise of carbon and alkali is studied and analyzed. The results show that siderite is the main carbonaceous mineral in bauxite, and amount of sulphate in mother liquor will significantly reduce amount of carbonate discharging from red mud during dissolution. In terms of production organization, control of use of high-carbon bauxite is changed to control of high-sulfur bauxite and high-carbon bauxite simultaneously. As a result, carbon alkali ratio of system is restored to normal level without salt discharging operation during evaporation process, and production cost is reduced. |
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