A study on Cr(VI) reduction from aqueous solutions by bauxite
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：M. D. TURAN H. S. ALTUNDO？AN
文章页码：1961 - 1967
Key words：bauxite ore; chromium; reduction; sulfuric acid
Abstract: The reduction of Cr(VI) in aqueous solution by using bauxite ore was investigated. Experimental results for Cr(VI) reduction in aqueous solution depending on some factors such as time, sulfuric acid amount, bauxite dosage, initial Cr(VI) concentration, formic acid concentration, daylight and temperature were presented. The obtained results show that sulfuric acid amount, bauxite dosage and initial Cr(VI) concentration of solution are most effective parameters on the reduction process. Also, it has been found that the 60 g/L of bauxite dosage is sufficient to reduce up to 100% of Cr(VI) from acidic solution under the condition of low initial Cr(VI) mass concentrations such as 10 mg/L. The reduction reaction is completed within 30 min at 25 oC under the experimental conditions: bauxite dosage of 60 g/L, amount of sulfuric acid 40-60 stoichiometric and initial mass concentration of Cr(VI), 10 mg/L. It was determined that reduction percentage is decreasing with increasing initial Cr(VI) concentration. The chemical oxygen demand of bauxite ore was found to be 26 mg COD/g.
M. D. TURAN1, H. S. ALTUNDO？AN2
(1. Department of Metallurgical and Materials Engineering, Firat University, Elaz？？ 23119, Turkey;
2. Department of Bioengineering, Firat University, Elaz？？ 23119, Turkey)
Abstract:The reduction of Cr(VI) in aqueous solution by using bauxite ore was investigated. Experimental results for Cr(VI) reduction in aqueous solution depending on some factors such as time, sulfuric acid amount, bauxite dosage, initial Cr(VI) concentration, formic acid concentration, daylight and temperature were presented. The obtained results show that sulfuric acid amount, bauxite dosage and initial Cr(VI) concentration of solution are most effective parameters on the reduction process. Also, it has been found that the 60 g/L of bauxite dosage is sufficient to reduce up to 100% of Cr(VI) from acidic solution under the condition of low initial Cr(VI) mass concentrations such as 10 mg/L. The reduction reaction is completed within 30 min at 25 oC under the experimental conditions: bauxite dosage of 60 g/L, amount of sulfuric acid 40-60 stoichiometric and initial mass concentration of Cr(VI), 10 mg/L. It was determined that reduction percentage is decreasing with increasing initial Cr(VI) concentration. The chemical oxygen demand of bauxite ore was found to be 26 mg COD/g.
Key words:bauxite ore; chromium; reduction; sulfuric acid
