乙酸/单宁酸还原浸出某低品位软锰矿

Reductive Leaching of Manganese from Certain Low-grade Pyrolusite with Tannic Acid and Acetic Acid

为合理开发利用某低品位软锰矿,首次以对环境友好且来源广泛的天然高分子单宁酸,结合乙酸作为新型复合绿色浸出剂,提供了一种更环保且安全的软锰矿浸出剂。通过单因素试验和正交试验考察了乙酸浓度、单宁酸浓度、液固比、反应温度以及反应时间对锰浸出率的影响。结果表明,影响锰浸出率的主要因素依次为单宁酸浓度、乙酸浓度、液固比、反应时间和反应温度。在乙酸浓度3.5 mol/L、单宁酸浓度25 g/L、液固比9 mL/g、反应温度85℃、反应时间2.5 h的最佳工艺条件下,软锰矿中锰的浸出率可达97.26%。

To rationally develop and utilize the procession of certain low-grade pyrolusite,the combination of more environmentally friendly and naturally macromolecular tannic acid,and acetic acid as a new composite green leaching agent was first investigated and applied in this experiment.It provides another sustainable and safe practice innovation for manganese leaching.The effects of acetic acid concentration,tannic acid concentration,liquid-solid ratio,reaction temperature,and reaction time on manganese leaching rate were studied through the single factor test and orthogonal test.The results showed that the main factors affecting manganese leaching rate were tannic acid concentration,acetic acid concentration,liquid-solid ratio,reaction time,and reaction temperature.Under the optimal process conditions(acetic acid concentration of 3.5 mol/L,tannic acid concentration of 25 g/L,liquid-solid ratio of 9 mL/g,reaction temperature of 85℃,and reaction time of 2.5 h),the leaching rate of manganese from pyrolusite could reach 97.26%.