Nickel sulfide concentrate was an important raw material for battery-grade nickel sulfate. To efficiently separate nickel from saprolitic laterite to product nickel sulfide concentrate, a novel and clean sulfidation-flotation process aimed to enhance selective sulfidation and particle growth through sodium carbonate was proposed herein. The effects of temperature, time, sulfur dosage, Na salts, and carbon additions on the selective sulfidation of nickel are systematically studied. Experimental results show that sodium carbonate can destroy the silicate structure, release nickel in the silicate, and form a low-melting point phase, promoting the aggregation of nickel sulfide, thereby achieving the purpose of promoting the sulfidation of nickel and the growth of synthetic nickel matte particles. Under the optimal conditions, 85.7% Ni and 27.1% Fe could be sulfated.

中文翻译：

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钠盐强化腐泥质红土中镍的选择性硫化


硫化镍精矿是电池级硫酸镍的重要原料。为了有效地将镍从腐泥红土中分离出来，生产硫化镍精矿，本文提出了一种新颖且清洁的硫化-浮选工艺，旨在通过碳酸钠增强选择性硫化和颗粒生长。系统研究了温度、时间、硫用量、Na 盐和碳添加量对镍选择性硫化的影响。实验结果表明，碳酸钠能破坏硅酸盐结构，在硅酸盐中释放镍，形成低熔点相，促进硫化镍的聚集，从而达到促进镍硫化和合成镍锍颗粒生长的目的。在最佳条件下，可硫酸化 85.7% 的 Ni 和 27.1% Fe。