Electrolytic extraction of non-metallic inclusions in pure nickel
CHAI Ting-xi1, WANG Xi-jing*1, WANG Jiang2, WANG Ping-yi2, CAO Ai-chong1
1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China; 2.Jinchuan Group Co., Ltd., Jinchang 737100, China
Abstract：The separation and extraction of non-metallic inclusions in pure nickel N6 were studied by electrolytic extraction experiments. The obtained reasonable electrolyte formula was listed as follows: 0.1% Cr2(SO4)3, 0.2%-0.4% sodium citrate, 0.1%-1% FeSO4, 0.1%-1% NiSO4 and 1% NaCl. The optimized electrolytic conditions were as below: the current density of 60-80 mA/cm2, the electrolytic time of 24 h, the experimental temperature of (20±5) ℃, and the electrolyte pH of 5-6. The electrolytic extraction of non-metallic inclusions in pure nickel N6 could be realized under the optimized electrolytic parameters above. The non-metallic inclusions were analyzed by the scanning electron microscope (SEM), energy dispersive spectroscope (EDS) and X-ray diffractometer. The results showed that the non-metallic inclusions existed in various N6 samples. However, the quantity and size of inclusions in different samples were different. The non-metallic inclusions were mainly composed of silicon, aluminum, calcium, magnesium, iron and oxygen. The main inclusion types included aluminum oxides, silicates, aluminates, complex inclusions and nitrides. The study had certain guiding significance to the metal smelting and casting technology.
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