In this work, the cyanide tailings were treated with slurry electrolysis technology. The removal of cyanide and the regularity of the oxidative dissolution of the main minerals in tailings during direct electrolysis (ET), air electrolysis (ETA), and NaCl electrolysis (ETC) were compared and analyzed. X ray diffraction, backscattered electron analysis, mineral liberation analysis, and other analytical methods were performed to analyze and characterize the mineral composition and interlocking relationship of cyanide tailings. Results indicated that cyanides and typical minerals, such as pyrite and pyrrhotite, in cyanide tailings would undergo a certain degree of oxidation and dissolution in the ET, ETA, and ETC systems, and the processing effect of the ETC system was more obvious than that of other systems. After the treatment, the mass loss of cyanide tailings could reach 8.62%, which was 5.10% and 1.36% higher than the mass loss in ET and ETA, respectively. The removal rates of CN, CN, Cu, Zn, and Fe were 92.07%, 97.17%, 86.31%, 98.24%, and 93.03%, respectively. The relative contents of pyrite and pyrrhotite decreased by 8.82% and 4.65%, respectively. The particle size occupancy rates of pyrite greater than 50 μm and pyrrhotite greater than 15 μm were 0.24% and 3.36%, respectively. The mineral liberation degrees of typical minerals increased significantly, and the mineral liberation degrees of pyrite and pyrrhotite increased by 16.46% and 13.20%, respectively. The oxidation of cyanides and minerals in cyanide tailings under the ETC system mainly involved electrochemical indirect oxidation. Cl migrated to the anode through electrogeneration to generate Cl/ClO in situ. CN and metal cyanide ions that migrated near the anode were oxidized by Cl/ClO to produce CO, N, and metal cations. Metal cations returned to the cathode where they were reduced and deposited. Pyrite, pyrrhotite, and other minerals in cyanide tailings could also be oxidized and dissolved by ClO. Therefore, the particle size of minerals decreased, and the degree of mineral liberation increased. As electrolysis proceeded, the interlocking relationship between the minerals was destroyed, and more minerals were exposed in the form of monomers. These phenomena provided favorable conditions for the subsequent comprehensive recovery of valuable metals from cyanide tailings.

中文翻译：

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矿浆电解无害化处理氰化尾矿对比试验研究


本工作采用矿浆电解技术处理氰化尾矿。对直接电解（ET）、空气电解（ETA）和氯化钠电解（ETC）过程中氰化物的去除及尾矿中主要矿物的氧化溶解规律进行了比较分析。采用X射线衍射、背散射电子分析、矿物游离分析等分析方法对氰化尾矿的矿物成分及连锁关系进行了分析和表征。结果表明，氰化尾矿中的氰化物及黄铁矿、磁黄铁矿等典型矿物在ET、ETA、ETC系统中都会发生一定程度的氧化溶解，且ETC系统处理效果较传统处理系统更为明显。其他系统。处理后氰化尾矿的质量损失可达8.62%，分别比ET和ETA的质量损失高5.10%和1.36%。 CN、CN、Cu、Zn、Fe的去除率分别为92.07%、97.17%、86.31%、98.24%、93.03%。黄铁矿和磁黄铁矿相对含量分别下降8.82%和4.65%。大于50μm的黄铁矿和大于15μm的磁黄铁矿的粒径占有率分别为0.24%和3.36%。典型矿物的矿物游离度显着提高，其中黄铁矿和磁黄铁矿的矿物游离度分别提高了16.46%和13.20%。 ETC系统下氰化尾矿中氰化物和矿物的氧化主要涉及电化学间接氧化。 Cl通过发电迁移到阳极，原位生成Cl/ClO。 迁移到阳极附近的 CN 和金属氰化物离子被 Cl/ClO 氧化，产生 CO、N 和金属阳离子。金属阳离子返回到阴极，在那里被还原并沉积。氰化尾矿中的黄铁矿、磁黄铁矿等矿物也能被ClO氧化溶解。因此，矿物质的粒径减小，矿物质的游离度增加。随着电解的进行，矿物质之间的连锁关系被破坏，更多的矿物质以单体的形式暴露出来。这些现象为后续从氰化尾矿中综合回收有价金属提供了有利条件。