Effect of pH on Precipitation of Ferronickel Leaching Solution by Using MgO for Mixed Sulfate Precipitate Synthesis

Applied Mechanics and Materials Pub Date : 2024-03-05 DOI:10.4028/p-7bujxz

Kevin Armeimada Prabowo, F. Abdul, Y. Setiyorini, V. A. Setyowati, S. Pintowantoro

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Abstract

The increasing demand for electric vehicles affects the high demand for nickel-based batteries, including Nickel Manganese Cobalt (NMC) batteries. Generally, NMC is processed from high-quality ore (sulfide ore) to produce nickel (II) sulfate hexahydrate or NiSO4.6H2O. But sulfide ore face scarcity due to a long history of mining and exploitation. Thus, laterite-type nickel ore can be an alternative to nickel resources. This study aims to produce mixed sulfate precipitates from a ferronickel leaching solution that can be utilized further to produce NiSO4.6H2O. Also, this research will study the pH effect of the precipitation process on the product's elemental composition, recovery, and compounds formed. The precipitation process was conducted using 5% MgO (weight basis) with a pH range of 2.5 to 6.5 with one increment. The mixed sulfate precipitates were characterized using AAS, EDX, and XRD. When using a pH of 3.5, a nickel concentration of 1473.00 ppm, nickel recovery of 23.02%, and Nickel grade of 3.18% could be obtained. As a result, the phase of NiSO4.6H2O was formed. Also, the other phases were formed after precipitation, such as CoSO4, FeSO4, and MgSO4.

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使用氧化镁合成混合硫酸盐沉淀物对镍铁浸出液 pH 值的影响

电动汽车需求的不断增长，影响了对镍基电池（包括镍锰钴（NMC）电池）的大量需求。一般来说，镍锰钴电池是从优质矿石（硫化矿）中提炼出六水硫酸镍或 NiSO4.6H2O。但是，由于长期的开采和开发，硫化矿石非常稀缺。因此，红土型镍矿可以作为镍资源的替代品。本研究旨在从镍铁浸出液中生成混合硫酸盐沉淀物，可进一步用于生产 NiSO4.6H2O。此外，本研究还将研究沉淀过程的 pH 值对产品的元素组成、回收率和形成的化合物的影响。沉淀过程使用 5%的氧化镁（重量基），pH 值范围为 2.5 至 6.5，以一个增量递增。使用 AAS、EDX 和 XRD 对混合硫酸盐沉淀物进行了表征。当 pH 值为 3.5 时，镍浓度为 1473.00 ppm，镍回收率为 23.02%，镍品位为 3.18%。因此，形成了 NiSO4.6H2O 相。此外，沉淀后还形成了其他相，如 CoSO4、FeSO4 和 MgSO4。

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Applied Mechanics and Materials

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