大洋多金属结核低温氢还原-酸浸新工艺研究

来源期刊:中国有色金属学报优先出版20210825

论文作者:周小舟 彭俊 沈裕军 黄宗朋 蔡云卓 钟山

文章页码:339 - 351

关键词:大洋多金属结核;低温氢还原;浸出;硫酸

Key words:ocean polymetallic nodules; low temperature hydrogen reduction; leaching; H2SO4

摘    要:大洋多金属结核是一种复杂难选的多金属氧化矿,本文以其为原料,开展了低温氢还原-酸浸新工艺研究。首先考察了氢还原温度、时间及氢气流量等因素对有价金属氧化物还原的影响,得出了优化的还原工艺条件:还原温度 600 ℃、时间90min、氢气流量 50mL/min。在此基础上,针对优化条件下的还原物料进行浸出研究,考察了浸出温度、时间、液固比、终点pH、双氧水和氧气用量对有价金属浸出的影响,结果表明:在浸出液固比6:1、温度80℃、氧气流量250mL/min、浸出时间6h、控制终点pH1.5~2.0的条件下,Ni、Co、Cu、Mn浸出率分别达99.09%,98.35%,94.97%,98.58%,实现了多金属结核中有价金属的高效浸出。

Abstract: Ocean polymetallic nodule is a kind of complex and difficult to concentrate polymetallic oxide. A new technology of low temperature hydrogen reduction-acid leaching was studied in this paper. Firstly, the effects of hydrogen reduction temperature, time and hydrogen flow rate on the oxidation reduction of each valuable metal were investigated. The optimal reduction process conditions were obtained: reduction temperature 600 ℃, time 90min, hydrogen flow rate 50mL/min.Under these conditions, the leaching of reduced materials under optimized conditions was studied, and the effects of leaching temperature, leaching time, liquid-solid ratio, pH and dosage of H2O2 and O2 on the leaching of valuable metals were investigated. The results showed that: Under the conditions of liquid-solid ratio 6:1, temperature 80 ℃, leaching time 6h, pH1.5~2.0 and oxygen flow rate 250mL/min, the leaching rates of Ni, Co, Cu and Mn reached 99.09%, 98.35%, 94.97% and 98.58%, respectively, which realized the efficient leaching of valuable metals from polymetallic nodules.

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