有色金属科学与工程2024，Vol.15Issue(6)：841-847,7.DOI:10.13264/j.cnki.ysjskx.2024.06.007
氯化挥发法提取电炉冶炼镍铁渣中镁
Extraction of magnesium from ferronickel slag produced in the electric furnace smelting by chloridizing volatilization
摘要
Abstract
Aiming at the problem that the high content of magnesium in ferronickel slag produced by electric furnace smelting laterite nickel minerals leads to the inability of slag to be used in large quantities and the waste of magnesium resources,the technical idea of chlorination of MgO in volatile slag with CaCl2 under the condition of carbon coexistence was proposed.The effects of chlorination temperature,holding time,carbon and calcium chloride addition on the volatilization rate of magnesium in slag were studied.The results showed that the volatilization rate of magnesium in ferronickel slag could reach 67.22%and the content of MgO in the slag after chlorination was reduced to 8.21%when n(C)/n(Mg)=1.25,n(CaCl2)/n(Mg)=1,and holding at 1 300℃for 120 min.The extraction process of magnesium from chlorination slag with CaCl2 under the condition of carbon coexistence was that O2 and acidic oxides in the slag made CaCl2 decompose to Cl2,and then it reacted with MgO to form MgCl2.The role of carbon was to reduce the reaction temperature of Cl2 and MgO.With the chlorination process,the main phase in the slag changed from Mg2SiO4 to CaMgSi2O6,and the melting temperature of the slag decreased from the initial 1 400 ℃ to 1 300 ℃.关键词
红土镍矿/镍铁渣/CaCl2/碳/镁/氯化挥发Key words
laterite nickel ore/ferronickel slag/CaCl2/carbon/magnesium/chloridzing volatilization分类
矿业与冶金引用本文复制引用
马红周,曾劲阳,王耀宁,党煜博,张兴,施瑞盟..氯化挥发法提取电炉冶炼镍铁渣中镁[J].有色金属科学与工程,2024,15(6):841-847,7.基金项目
陕西省自然科学基础研究计划项目(2019JLM-36) （2019JLM-36）
