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首页> 外文会议>Annual Meeting Exhibition of The Minerals, Metals Materials Society >Impurity Uptake During Cooling Crystallization of Nickel Sulfate
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Impurity Uptake During Cooling Crystallization of Nickel Sulfate

机译：硫酸镍冷却结晶过程中的杂质摄取

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摘要

Battery production for electric vehicles has increased rapidly in the last decade, and the projections show an ever-increasing demand for the next years. This leads to a need for recycling of valuable metals used in batteries, such as nickel, for a sustainable development. Nickel can be recovered from process streams or side streams in hydrometallurgical industry as nickel sulfate by crystallization, in order to obtain high-purity products for applications like battery-grade nickel sulfate. In this work, NiSO_4-6H_2O was precipitated by cooling crystallization in a temperature-controlled batch reactor, and uptake of Na, Cl, and Mg, impurities commonly found in hydrometallurgical industries, were investigated. Increasing the initial impurity concentrations in the reactor caused increased impurity content in the precipitates, and the highest uptake was provided by Mg. Characterization of final products with X-ray diffraction (XRD) showed that the precipitating polymorph was altered at high impurity concentration. The results of partial dissolution studies indicated that uptake of Cl was negligible, and Na was weakly adsorbed on the crystal surface, while Mg was also incorporated in the bulk of the crystals, possibly explained by the similar properties of Mg and Ni.
机译：电动汽车的电池生产在过去十年中迅速增加，预测对未来几年的需求越来越大。这导致需要回收用于可持续发展的电池（如镍）的有价值金属。镍可以从液压冶金工业中的工艺流或侧料流中回收作为硫酸镍通过结晶，以获得高纯度产品，用于电池级硫酸镍等应用。在这项工作中，通过在温度控制的批量反应器中冷却结晶沉淀，研究了NISO_4-6H_2O，研究了Na，Cl和Mg的摄取，含水管冶金行业中常见的杂质。增加反应器中的初始杂质浓度导致沉淀物中的杂质含量增加，并且由Mg提供最高摄取。具有X射线衍射（XRD）的最终产品的表征显示沉淀多晶型物以高杂质浓度改变。部分溶解研究的结果表明，CL的摄取可忽略不计，Na弱堆积在晶体表面上，而Mg也掺入大部分晶体中，可能通过Mg和Ni的类似性质解释。

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