Determination of occurrence and leaching toxicity of arsenic in copper flash smelting slags

ZHANG, Hui-bin; Wang, Yanan; ZHU, Yin-bin; REN, Peng; Hu, Bin; Xu, Shenghang; Zhou, Jun; Zheng, Guoqu

doi:10.1016/s1003-6326(22)66107-7

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…However, during the combine's work, a large amount of solid waste (overburdened rocks, tailings, dump slag) has accumulated, for the disposal of which more than 9800 hectares have been allocated. Sulfides of non-ferrous metals and iron in the waste storage process are oxidized with the formation of sulfuric acid; heavy metals are converted to water-soluble salts, resulting in the acidification of natural waters by mining facilities [2][3][4][5][6][7][8][9]. Hypergenic changes in minerals of technogenic products occur much faster than in natural geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Deep Processing of Dump Slag from the Copper-Nickel Industry

Kasikov

Shchelokova

Timoshchik

et al. 2023

Metals

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This work proposes an environmentally safe and economically feasible method of waste copper-nickel production slag utilization (Kola Mining-Metallurgical Company, Nornickel, Kola Peninsula, Russia). This process involves the decomposition of slag by diluted solutions of sulfuric acid (7–10 wt.% H2SO4) with a transfer in a solution of more than 70% silicon, 77% iron and 78% magnesium, and a concentration of non-ferrous metals in the residue (~70%). Copper ions were used in the leaching stage to prevent the release of hydrogen sulfide into the working atmosphere. Dehydration of the solution, followed by washing of water-soluble sulphates from silica, was carried out to separate silica from the leaching solution. The dehydration temperature effect on the silica structural characteristics was determined. The possibility of recovering non-ferrous metals from solutions after silica extraction by precipitation, in the form of copper cementite, and the sum of nickel and cobalt sulfides, was evaluated. Pigment-grade iron dioxide, magnesium sulphate and aluminium hydroxide were obtained by dehydration of the solution after extraction of base metals, calcination and other operations. Sulfuric acid leaching resulted in the disclosure of sulfide grains encapsulated in ferrosilicate, which is a favorable factor for flotation. The depleted residue can be successfully used in the construction industry.

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