(长沙矿冶研究院有限责任公司 矿产资源开发利用技术研究所，长沙 410012)
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90 min、氢气流量 50 mL/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值、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250 mL/min、浸出时间6 h、控制终点pH 1.5~2.0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。
关键字: 大洋多金属结核；低温氢还原；浸出；硫酸
（Institute of Mineral Resources Development and Utilization Technology, Changsha Research Institute of Mining and Metallurgy Co., Ltd., Changsha 410012, China）
Abstract:The ocean polymetallic nodule is a kind of complex polymetallic oxide that is difficult to concentrate. A new technology of low temperature hydrogen reduction-acid leaching was studied. 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 at reduction temperature of 600 ℃, time of 90 min, and hydrogen flow rate of 50 mL/min. Under these conditions, the leaching process of reduced materials under optimized conditions was studied, and the effects of leaching temperature, leaching time, liquid-solid ratio, pH value, dosages of H2O2 and O2 on the leaching of valuable metals were investigated. The results show that, under the conditions of liquid-solid ratio 6:1, temperature 80 ℃, leaching time 6 h, pH 1.5-2.0 and oxygen flow rate 250 mL/min, the leaching rates of Ni, Co, Cu and Mn reach 99.09%, 98.35%, 94.97% and 98.58%, respectively, which realize the efficient leaching of valuable metals from polymetallic nodules.
Key words: ocean polymetallic nodules; low temperature hydrogen reduction; leaching; H2SO4
