含锰磁铁相还原氧化锰矿的浸出工艺

Leaching process of manganese magnetite phase in reduction of manganese oxide ores

针对含锰磁铁相的还原氧化锰矿浸出效果差的问题,以云南文山示范线还原氧化锰矿、浸出尾渣为主要研究对象,考察起始酸度、浸出时间和浸出温度对锰磁铁相浸出反应的影响;在明确锰磁铁相浸出规律基础上,优化浸出工艺。结果表明,锰磁铁相在较高酸浓度梯度下,能保持较快的浸出速率;先后采用质量浓度为48.02 g/L的起始酸浸出一氧化锰相,76.44 g/L的浸出锰磁铁相的两段逆流浸出工艺,比单段浸出工艺,锰浸出率从82.31%增加到92.17%,酸耗(酸矿质量比)从0.55减少到0.50。

The-leaching-behaviors-of-a-reduction-manganese-oxide-ores-with-manganese-magnetite-phase-from-the-demonstration-plant-in-Yunnan-Province-were-presented.-The-effects-and-influence-of-sulfuric-acid-concentration,-leaching-time,-leaching-temperature-on-Mn-leaching-rate-and-residual-acid-were-investigated.-The-results-show-that-only-at-a-relatively-higher-acid-concentration-condition,-the-manganese-magnetite-phase-can-maintain-a-fast-leach-rate.-A-two-stage-countercurrent-leaching-technology-is-applied,-the-first-stage-leached-manganese-monoxide-phase-with-sulfuric-acid-concentration-of-48.02-g/L-and-the-second-stage-with-sulfuric-acid-concentration-of-76.44-g/L.Compared-with-the-one-stage-leaching-process,-the-leaching-rate-of-manganese-in-the-two-stage-leaching-process-increases-from82.31%-to-92.17%,-and-the-acid-consumption（acid-to-ore-ratio）decreased-from-0.55-to-0.50.