Abstract

 
 
 he focus of the study was the acidic underspoil waters of Safyanovskaya copper JSC containing 0.17 g/l of copper and 1.8 g/l of zinc (pH 2.8–2.9). The purpose of the work was research and development of water purification technology from impurities (copper, zinc, aluminum, iron, manganese), suggesting the possibility of copper and zinc extraction in the form of commercial products. The process of copper extraction by cementation with metallic iron was studied. It was shown that this method could allow to extract 94–95 % copper into a concentrate. The zinc extraction from solution after copper removal was studied by precipitation with NaHS, Na2CO3, NaOH and CaO. For economic reasons it is recommended to make zinc precipitation in two stages with CaO in order to produce cake containing 15–21 % Zn with extraction 80–87 %. This cake can be utilized at zinc processing plant. A process flowsheet for acidic underspoil waters, including copper cementation and the precipitation of zinc cake, has been developed. According to this scheme, mother liquor from zinc precipitation should be treated with lime until pH reaches 10–10.5, followed by pulp settling. As a result, purified water of the following composition is obtained, mg/l: zinc – 0.05, copper – 0.01, aluminum – 0.02, iron – 0.02, manganese – 0.05.
 Keywords: underspoil water, copper, zinc, iron, cementation, calcium oxide, concentrate, precipitation
 
 
Highlights
The underspoil and mine waters of enterprises engaged in the processing of copperzinc pyrite ores are an important resource for the extraction of copper and zinc in the Ural region
Extraction of copper was carried out by cementation with an iron according to the equation [1]
In accordance with works [2, 3] it was pointed out that effective processing of zinc products by Waeltz process was possible while the content of the zinc in concentrate was at least 15–20 %
Summary
The underspoil and mine waters of enterprises engaged in the processing of copperzinc pyrite ores are an important resource for the extraction of copper and zinc in the Ural region. These waters are sent to neutralization plants, where non-ferrous and ferrous metals are precipitated with water regeneration for industrial needs. The extraction of valuable components is not performed. The organization of water purification from impurities with the associated commercial extraction of valuable components may be appropriate. The aim of the study was to develop a process of copper and zinc extraction from underspoil waters in the form of commercial products. Klyushnikov, (2020), “Extraction of Non-ferrous Metals from Underspoil Waters” in IV Congress “Fundamental research and applied developing of recycling and utilization processes of technogenic formations”, KnE Materials Science, pages Page 472
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