Method for purifying and deferrizing electrolytic manganese leach solution

Abstract

The invention relates to a method for purifying and deferrizing an electrolytic manganese leach solution, which comprises the following steps: when a compound leach solution of electrolytic manganese metal reaches to the leaching reaction end point, determining the total content of Fe<2+> in the leach solution, and adding MnO2, which is 0.6-1.2 times of the theoretical amount required by completely oxidizing all the Fe<2+>, into the leach solution; after finishing adding the MnO2, continuing stirring to react, determining the residual total content of Fe<2+> in the leach solution, and adding a strong oxidizer required by completely oxidizing the residual Fe<2+> so as to lower the concentration of the residual Fe<2+> to below 1mg / L; regulating the pH value of the solution with a neutralization reagent, and detecting the concentration of the Fe<2+> in the solution; and removing solid impurities from the solution by using a filter plant. The invention provides an oxidizing and deferrizing method by combining MnO2 and a strong oxidizer; and on the premise of ensuring the deferrizing effect, the invention prolongs the leaching reaction time, increases the concentration of Mn<2+> in the solution and lowers the deferrizing cost.

Description

technical field [0001] The invention relates to a method for purifying and removing iron from an electrolytic metal manganese compound leaching solution, which is applied to the purification process of the electrolytic metal manganese industry to remove Fe 2+ Effectively oxidize and remove by precipitation, and increase Mn in the solution while oxidizing and removing iron 2+ concentration. Background technique [0002] The production of metal electrolytic manganese generally adopts the method of compound leaching, purification and electrowinning. During the leaching process, metallic impurities such as iron also enter the solution. In order to obtain a qualified electrolyte, the Fe in the leaching solution needs to 2+ The concentration was reduced to within 1mg / L. The commonly used iron removal method is the hydrolysis purification method, that is, by adjusting the acidity of the solution, the iron ions to be removed are precipitated in the form of hydroxide, and then th...

AI Technical Summary

Problems solved by technology

[0004] Use H 2 o 2 , O 3 Such strong oxidants generally only need to add the amount of theoretical value to make Fe 2+ Reduced to below 1mg / L, but due to its high price, the actual use cost is also high. An electrolytic manganese enterprise with an annual output of 30,000 tons needs several million yuan in annual expenditure, and it needs to be added to the leachate during use. Unnecessary moisture is added, which increases the difficulty of solution balance

Compared to H 2 o 2 Strong oxidizing agents such as MnO 2 Oxidation power is weak, therefore, need to use excess MnO 2 , often need 50% of the excess theoretical value to achieve the same effect, resulting in higher cost of use