多金属结核矿浆电解的浸出机理研究

LEACHING MECHANISM OF OCEAN POLYMETALLIC NODULES IN SLURRY ELECTROLYSIS

围绕多金属结核的矿浆电解,对多金属结核矿和MnO2在矿浆电解过程中锰的行为规律进行了研究。通过对不同条件下石墨阴极极化曲线的测定和纯二氧化锰矿浆电解浸出行为的研究,查明了多金属结核矿浆电解的阴极浸出反应机理。浸出过程中,阴极上发生的主要是FeCl(3-n)n的还原反应,多金属结核的浸出主要由FeCl(2-n)n,FeCl(3-n)nn来完成。阴极生成的FeCl(2-n)n被结核氧化成FeCl(3-n)又在阴极被还原为FeCl(2-n)n,如此反复。多金属结核的浸出可通过三种途径实现:阴极还原、化学还原和化学溶解,其中多金属结核与阴极碰撞发生的阴极还原反应对锰浸出的贡献率小于5%,多金属结核的浸出主要由FeCl(2-n)n完成。

The cathode reaction mechanism of manganese in the Ocean Polymetallic Nodules during the Slurry Electrolysis is investigated by the cathode polarization curve determined under various conditions and the corresponding experiments.The main reaction on the cathode is the reduction of FeCl^((3-n))_n. Because of the existence of the Ocean Nodules particles,the FeCl ^((2-n))_n produced on the cathode will be oxidized by the Ocean Nodules,and FeCl ^((3-n))_n will be reduced on the cathode again and so on.There are three ways for the Ocean polymetallic nodules to be leached,which are cathode reduction,chemical reduction and chemical dissolution.Among them,the ratio of direct reduction of the nodule particles on the cathode is less than 5%.The majority of manganese in the Ocean Polymetallic Nodules is leached by FeCl^((2-n))_n during Slurry Electrolysis.