Comparison of deep desulfurization methods in alumina production process
来源期刊：中南大学学报(英文版)2015年第10期
论文作者：LIU Zhan-wei LI Wang-xing MA Wen-hui YIN Zhong-lin WU Guo-bao
文章页码：3745 - 3750
Key words：high-sulfur bauxite; alumina production; desulfurization; wet oxidation
Abstract: Several methods of deep desulfurization in alumina production process were studied, and the costs of these methods were compared. It is found that most of the S2- in sodium aluminate solution can be removed by adding sodium nitrate or hydrogen peroxide in digestion process, and in this way the effect of S2- on alumina product quality is eliminated. However, the removal efficiency of in sodium aluminate solution is very low by this method. Both S2- and in sodium aluminate solution can be removed completely by wet oxidation method in digestion process. The cost of desulfurization by wet oxidation is lower than by adding sodium nitrate or hydrogen peroxide. The results of this research reveal that wet oxidation is an economical and feasible method for the removal of sulfur in alumina production process to improve alumina quality, and provide valuable guidelines for alumina production by high-sulfur bauxite.
LIU Zhan-wei(刘战伟)1, 2, LI Wang-xing(李旺兴)3, MA Wen-hui(马文会)1, 2, YIN Zhong-lin(尹中林)3, WU Guo-bao(武国宝)3
(1. Faculty of Metallurgical and Energy Engineering,
Kunming University of Science and Technology, Kunming 650093, China;
2. State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province/
The National Engineering Laboratory for Vacuum Metallurgy (Kunming University of Science and Technology), Kunming 650093, China;
3. Zhengzhou Research Institute of CHALCO, Zhengzhou 450041, China)
Abstract:Several methods of deep desulfurization in alumina production process were studied, and the costs of these methods were compared. It is found that most of the S2- in sodium aluminate solution can be removed by adding sodium nitrate or hydrogen peroxide in digestion process, and in this way the effect of S2- on alumina product quality is eliminated. However, the removal efficiency of in sodium aluminate solution is very low by this method. Both S2- and in sodium aluminate solution can be removed completely by wet oxidation method in digestion process. The cost of desulfurization by wet oxidation is lower than by adding sodium nitrate or hydrogen peroxide. The results of this research reveal that wet oxidation is an economical and feasible method for the removal of sulfur in alumina production process to improve alumina quality, and provide valuable guidelines for alumina production by high-sulfur bauxite.
Key words:high-sulfur bauxite; alumina production; desulfurization; wet oxidation
