Abstract:

Magnesium carbonate was prepared by carbonization leaching from desiliconization slag of laterite nickel ore, and the content of NiO in the residue reached 2.96%.The results showed that extraction ratio of MgO increased with increasing stirring speed, reaction time and liquid-to-solid ratio, however, the extraction ratio increased firstly and then decreased with increasing reaction temperature.When stirring speed was 600 r·min^-1, reaction temperature was 15℃, reaction time was 36 h and liquid-to-solid ratio was 40∶1, the extraction ratio of MgO could reach as high as 91.57%.XRD analysis indicated that the product was magnesium carbonate, and its physical and chemical properties conformed to the state standards of chemical industry.

Key words:

红土镍矿, 脱硅渣, 碳化, 热解, 碳酸镁

摘要： 以红土镍矿脱硅渣为原料，采用碳化、热解工艺制备出碳酸镁产品，并使NiO在碳化渣中富集到2.96%。研究表明，氧化镁的提取率随着搅拌强度、反应时间及液固比（ml:g）的增加而增加，随着反应温度的升高先增加后减少。在搅拌强度600 r·min^-1、反应温度15 ℃、反应时间36 h及液固比（ml:g）40:1的条件下，氧化镁的提取率可达91.57％。经XRD分析，产品为碱式碳酸镁；产品理化性能符合国家化工行业HG/T 2959—2000标准。

关键词:

红土镍矿, 脱硅渣, 碳化, 热解, 碳酸镁