Alkaline pretreatment for chlorine removal from high-chlorine rhodochrosite |
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Authors: | Xing-ran Zhang Zuo-hua Liu Wen-sheng Li Ya-ya Cheng Jun Du Chang-yuan Tao |
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Affiliation: | Chongqing Key Laboratory of Chemical Process for Clean-Energy and Resource Utilization, Colege of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China |
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Abstract: | Chloride in manganese ore adversely affects mineral extraction. The mechanisms and the factors that influence an alkali pretreatment to removal chlorine from manganese ore were explored to eliminate hazards posed by chlorine during the electrolysis of manganese. The results showed that sodium carbonate, when used as an alkaline additive, promoted the dissolution of insoluble chloride, enhanced the migration of chloride ions, and effectively stabilized Mn2+. The optimal conditions were a sodium carbonate concentration of 0.45 mol·L?1, a liquid-solid ratio of 5:1 mL·g?1, a reaction time of 1 h, and a temperature of 25°C. The chlorine removal efficiency was greater than 95%, and the ore grade (Mn) was increased by 2.7%. |
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Keywords: | manganese ore treatment rhodochrosite sodium carbonation pretreatment dechlorination |
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