Nickel sulfide concentrates are critical materials for the production of metallic nickel. The disadvantages associated with the conventional nickel extraction process are the considerable amounts of sulfur dioxide emissions in the smelting process and the complex Ni refining steps to produce a marketable product. The authors proposed a novel thermal treatment method for nickel sulfide concentrates with minimal SO₂ emissions and have increased the ferronickel particle size through a two-stage heat treatment process. Heating the materials at 1223 K followed by slow cooling to 973 to 1073 K produced large ferronickel particles of d₈₀ = 500 μm and Ni extraction of approximately 97 pct.

硫化镍精矿是生产金属镍的关键材料。与传统镍提取工艺相关的缺点是在冶炼过程中会排放大量二氧化硫，以及生产适销产品的镍精炼步骤复杂。作者提出了一种新的硫化镍精矿热处理方法，SO ₂排放量最少，并通过两阶段热处理工艺增加了镍铁粒度。将材料加热至 1223 K，然后缓慢冷却至 973 至 1073 K，产生d ₈₀ = 500 μm 的大镍铁颗粒和约 97 pct 的镍提取量。