Recovery of Mn and Mg from wet wastewater of laterite nickel ore
Laterite nickel ore hydrometallurgical process is widely used in industrial production,with a large number of valuable metals containing Mn2+,Ca2+,Mg2+waste liquid.Selective recovery can not only improve economic benefits,but also reduce the difficulty of waste liquid treatment.Using CO2 as carbon source and NaOH as pH regulator,the manganese in waste liquid can be selectively recovered under the conditions of 10％NaOH concentration,15 min reaction time and pH=6.6,and the crude manganese carbonate containing 41％Mn,2.5％Ca and 0.8％Mg can be prepared.After the recovery of manganese,the waste liquid was further adjusted to the pH value of 0.5 mol/L sodium carbonate solution to 10,and Mg2+in the liquid phase was recovered.This recovery process can improve the economic benefit line,reduce the carbon emission of the wet smelting process,and has a high green and economic application prospect.
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维普
