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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Use of sulphur dioxide as reducing agent in cobalt leaching at Shituru hydrometallurgical plant
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Use of sulphur dioxide as reducing agent in cobalt leaching at Shituru hydrometallurgical plant

机译：Shituru湿法冶金厂钴浸出中使用二氧化硫作为还原剂

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摘要

Copper oxide ores deposits in the Katanga province of the Democratic Republic of Congo (DRC) contain at variable level cobalt oxide minerals. In contrast to copper oxide minerals which readily dissolve in the sulphuric acid solution, the cobalt oxide bearings are difficult to dissolve, especially if cobalt is present in the third oxidation state (Co_2O_3). This species become soluble after reduction of Co~(+3) in Co~(+2). In practice, the use of reducing agent is therefore necessary in order to transform the insoluble minerals into soluble cobalt sulphate species. The following reducing agents are currently used at the Shituru plant: ferrous ions, which are present in leach solutions, pulverised copper or sodium meta bisulphite (MBS).Due to the high consumption of reducing agents (0,8 t MBS/t of solubilized Co; 1,2 t Cu/t-Co), cobalt production is expensive. The use of sulphur dioxide as reducing agent was then investigated in order to reduce operating cost. This reagent also presents the advantage of sulphuric acid production during the leaching process. It has been added in the leaching vessel (tank).From the laboratory and industrial tests, selective leaching of cobalt (78 percent) has been performed. The cobalt leaching kinetic depend on sulphur dioxide dosage. Dissolution of copper, iron and manganese remained very low. No emanation of SO_2 gas was observed during the process.
机译：刚果民主共和国加丹加省（DRC）的氧化铜矿石矿床含有不同含量的氧化钴矿物。与易于溶解在硫酸溶液中的氧化铜矿物相反，氧化钴轴承难以溶解，特别是如果钴以第三氧化态（Co_2O_3）存在。在Co〜（+2）中还原Co〜（+3）后，该物种可溶。因此在实践中，因此有必要使用还原剂以将不溶性矿物转化为可溶性硫酸钴物质。 Shituru工厂目前使用以下还原剂：浸出溶液中存在的亚铁离子，粉碎的铜或偏亚硫酸氢钠（MBS）。由于还原剂的消耗量很高（0.8 t MBS / t增溶剂Co; 1,2 t Cu / t-Co），钴的生产价格昂贵。然后研究了使用二氧化硫作为还原剂以降低运行成本。该试剂还具有在浸出过程中产生硫酸的优点。它已添加到浸出容器（罐）中。通过实验室和工业测试，已对钴（78％）进行了选择性浸出。钴的浸出动力学取决于二氧化硫的用量。铜，铁和锰的溶解度仍然很低。在此过程中未观察到SO_2气体的散发。

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