Determination of S2- and S2O2-3 in sodium aluminate solution produced during alumina production by Bayer process
YUAN Jing-jiu1,2, CHEN Chao-yi*1,2, MAO Xiao-hao1,2, LI Jun-qi1,2, LAN Yuan-pei1,2
1. School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2. Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang 550025, China
Abstract：During the production of alumina from high-sulfur bauxite by Bayer process, the sulfur in ore enters into sodium aluminate solution in the form of S2- and S2O2-3, which cause a series of harm to the production. A special device was designed. The stannous chloride solution(in hydrochloric acid media) was added into sulfur-containing sodium aluminate solution. Nitrogen was selected as the protection gas and carrier. The generated hydrogen sulfide gas could react with cadmium acetate solution to from cadmium sulfide precipitate. Then the content of S2- was determined by indirect iodimetry. The silver nitrate solution was added to form silver thiosulfate, silver sulfite and silver sulfate precipitates. Then ammonia water was added to dissolve silver sulfite and silver sulfate precipitates. The content of S2O2-3 was determined according to the amount of silver sulfide precipitate from the hydrolysis of silver thiosulfate. The influence of nitrogen flow rate, ammonia water dosage and starch indicator dosage on the determination results was investigated. The proposed method was applied for the determination of S2- and S2O2-3 in three types of simulated sodium aluminate solution. The recoveries of S2- and S2O2-3 were both 95%. The relative standard deviations (RSD, n=5) of determination results for S2- and S2O2-3 were 0.12%-0.34% and 0.27%-0.57%, respectively. The contents of S2- and S2O2-3 in three sodium aluminate solution samples in alumina production by Bayer process in an aluminum factory of Guizhou Province were determined according to the experimental method. The RSDs (n=5) of determination results for S2- and S2O2-3 were 0.28%-0.35% and 0.32%-0.46%, respectively. The recoveries were between 94% and 95%.
苑京久, 毛小浩, 李军旗, 兰苑培. 拜耳法生产氧化铝过程铝酸钠溶液中S2-和S2O2-3的测定[J]. 冶金分析, 2020, 40(1): 28-32.
YUAN Jing-jiu, CHEN Chao-yi, MAO Xiao-hao, LI Jun-qi, LAN Yuan-pei. Determination of S2- and S2O2-3 in sodium aluminate solution produced during alumina production by Bayer process. , 2020, 40(1): 28-32.
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