利用蔗髓为还原剂浸出高铁氧化锰矿的研究

以蔗髓为还原剂, 在酸性条件下浸出高铁氧化锰矿, 通过正交和单因素实验考察了蔗髓用量、硫酸浓度、浸出温度、反应时间及液固比对锰浸出率和浸出液中残余有机物含量的影响。在蔗髓/锰矿质量比0.07 g/g、硫酸浓度6.44 mol/L、浸出温度90 ℃、反应时间3 h、液固比2.0 mL/g条件下, 锰浸出率73.73%, 浸出液COD含量530 mg/L。锰矿中未被浸出的锰, 按铁屑/锰矿质量比0.06 g/g添加铁屑, 继续进行还原反应, 总锰浸出率可达到95%以上。

Reductive Leaching of Manganese from Iron Rich Manganese Oxide Ores with Bagasse Pith as Reductant

Manganese leaching from an iron-rich manganese oxide with bagasse pith as a reducing agent in sulfuric acid medium was investigated through orthogonal and single-factor experiments. Influences of factors, including dosage of bagasse pith, sulfuric concentration, leaching temperature, reaction time and liquid-to-solid ratio, on the Mn leaching rate and COD in the leaching solution were discussed. It is found that under an optimized condition, including bagasse pith dosage to manganese ores at a mass ratio of 0.07 g/g, sulfuric concentration at 6.44 mol/L, reaction temperature of 90 ℃, a liquid-to-solid ratio of 2.0 mL/g, and reaction time of 3 h, leaching rate of Mn reached 73.73% and COD in the leaching liquid was decreased to 530 mg/L. After that, by adding scrap iron/manganese ores at a mass radio of 0.06 g/g as the reductant for further reduction, the total Mn leaching rate can be increased to over 95%.