Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching

Resources Processing Pub Date : 2017-01-01 DOI:10.4144/RPSJ.64.3

Baisui Han, B. Altansukh, Kazutoshi Haga, Y. Takasaki, A. Shibayama

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引用次数: 5

Abstract

In this paper, we present the results for recovery of copper from silicate-containing low-grade copper ore using flotation followed by atmospheric and high-pressure oxidative leaching. The effects of various flotation parameters, such as flotation time, PAX dosage, slurry pH and air injection rate on beneficiation of copper from the low-grade copper ore were studied. The recovery of copper reached 93.1% and the grade of copper improved to 18.2 mass% from 0.4 mass% under collector-less optimum flotation conditions. The enrichment ratio of copper in the concentrate was 45. The copper concentrate obtained from flotation of the low-grade copper ore was treated by atmospheric leaching and high-pressure oxidative leaching processes. A maximum recovery (>93.0%) of copper was obtained by high-pressure oxidative leaching in the water, whereas the copper recovery was lower than 12% in the sulfuric acid solution under atmospheric leaching conditions. The copper concentration in a pregnant leach solution enriched up to 15.0 g/L under the optimized leaching conditions. The effect of impurity such as iron in the sample on the froth flotation and both leaching processes is also considered. A process flow for the recovery of copper from silicate-containing low-grade copper ores is proposed as a result of these studies.

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浮选-高压氧化浸出法回收含硅酸盐低品位铜矿石中的铜

本文介绍了从含硅酸盐低品位铜矿石中采用浮选-常压氧化浸出法和高压氧化浸出法回收铜的试验结果。研究了浮选时间、PAX投加量、矿浆pH、空气注入量等浮选参数对某低品位铜矿石选铜的影响。在无捕收剂的最佳浮选条件下，铜回收率达到93.1%，铜品位由0.4质量%提高到18.2质量%。铜精矿富集比为45。对某低品位铜矿浮选所得铜精矿进行了常压浸出和高压氧化浸出两种工艺处理。高压氧化浸出条件下，铜在水中的最大回收率(>93.0%)，而在常压硫酸浸出条件下，铜的回收率低于12%。在优化的浸出条件下，浸出液中铜的浓度可达15.0 g/L。同时考虑了样品中铁等杂质对泡沫浮选和两种浸出过程的影响。在此基础上，提出了从含硅酸盐低品位铜矿中回收铜的工艺流程。

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Resources Processing

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