硝酸氧化浸出难冶炼高砷钴矿

来源期刊：中国有色金属学报2010年第7期

论文作者：郑雅杰 滕浩 闫海泉

文章页码：1418 - 1423

关键词：高砷钴矿；氧化浸出；硫酸；硝酸

Key words：high-arsenic cobalt ores; oxidation leaching; sulfuric acid; nitric acid

摘    要：在100 g钴矿加入39 mL浓硫酸、浸出温度80 ℃、浸出时间2 h、液固比2:1时，采用常规的硫酸浸出，钴浸出率仅为16.86%；当100 g钴矿中加入42.5 mL浓硫酸、在焙烧温度630 ℃、焙烧时间1.5 h的焙烧条件下，采用硫酸化焙烧后硫酸浸出，钴浸出率达到67.48%；在100 g钴矿中加入39 mL浓硫酸和56 mL浓硝酸、浸出温度60 ℃、浸出时间4 h、液固比为3:1时，采用硝酸氧化下硫酸浸出，钴浸出率为96.35%。

Abstract: The leaching rate of Co is only 16.86% under condition of 39 mL sulfuric acid in 100 g cobalt ores, reaction time 2 h, reaction temperature 80 ℃, the ratio of liquid to solid 2:1 when high-arsenic cobalt ores was leached by sulfuric acid solution. The leaching rate of Co reaches 67.48% when 100 g cobalt ores was contacted with 42.5 mL sulfuric acid and roasted at 630 ℃ for 1.5 h, and then the obtained calcine is leached in sulfuric acid solution. In the process of nitric acid oxidation leaching with sulfuric acid, the leaching rate of Co is 96.35% when the nitric acid and sulfuric acid addition volume are 56 mL and 39 mL in 100 g cobalt ores, reaction time is 4 h, reaction temperature is 60 ℃, the ratio of liquid to solid is 3:1.