A Research on Application of Manganese Wastewater Precipitate Residue Resource Utilization
The precipitated of manganese wastewater is the product of electrolytic manganese production wastewater and the leachate of slag storage.It mainly exists in the form of Mn,Ca and Mg hydroxide.It can be used in the process of liquid acid reduction in electrolytic manganese production.In this paper,combined with the liquid preparation process of manganese metal,the application of manganese containing wastewater precipitated slag was studied.The results show that,after the waste water containing manganese is treated with lime,the content of Mn,Ca and Mg in the precipitated slag is 5.77％,32.04％and 6.44％.The slag is used in the acid reduction process of electrolytic manganese liquid production.Under the condition of the same amount of acid reduction,the amount of precipitated slag in the waste water containing manganese is 2.67 times that of calcium carbonate powder.Fe content in the solution will be decreased from 11.58 mg/L to 1.3 mg/L after acid reduction.Compared with calcium carbonate powder acid reduction process,Fe content was decreased by 87.6％,the content of other trace impurities was basically the same.And the slag manganese content was lower by 0.35％.The precipitated slag was more advantageous for electrolytic manganese acid reduction process.The application showed that the application of manganese containing wastewater precipitates in the process of electrolytic manganese making liquid can reduce the consumption of auxiliary materials,the impurity of the solution.It stabilizes the quality of the solution to realize the resource utilization of manganese containing wastewater precipitates.
Manganese wastewater precipitate residueResource utilizationPreparation of electrolytic manganese metal solutionNeutralization acid
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