Method for preparing sulfide and mixed product of sodium sulfide and ammonium sulfate by manganese-containing waste liquid

Abstract

The invention provides a method for preparing sulfide and mixed product of sodium sulfide and ammonium sulfate by manganese-containing waste liquid, which comprises the steps of: leaching the manganese-containing waste liquid obtained by producing hydroquinone, and obtaining clear filtrate containing manganese sulfate, the ammonium sulfate and sulfuric acid as well as a filter cake containing simple substance residue; leading the filter cake containing simple substance residue to have reaction with the excess sulfuric acid, and obtaining solution containing calcium sulfate, magnesium sulfate, zinc sulfate, sodium sulfate, aluminum sulfate, cadmium sulfate and nickel sulfate; then, mixing the obtained solution and ammonium sulfide solution for reaction, and obtaining mixed solution of the ammonium sulfate and the sulfide containing calcium sulfide, magnesium sulfide, zinc sulfide, sodium sulfide, aluminium sulfide, cadmium sulfide and nickel sulfide; filtering the obtained mixed solution, and obtaining a mixed sulfide filter cake of the calcium sulfide, the magnesium sulfide, the zinc sulfide, the aluminium sulfide, the cadmium sulfide and the nickel sulfide as well as filtrate containing the sodium sulfide and the ammonium sulfate; washing, drying and grinding the mixed sulfide filter cake, and obtaining the sulfide product; and finally, carrying out reduced pressure distillation and cooling crystallization on the filtrate containing the sodium sulfide and the ammonium sulfate, and obtaining the mixed product of the sodium sulfide and the ammonium sulfate.

Description

technical field [0001] The present invention relates to the technical field of treatment and utilization of manganese-containing waste liquid, especially a method for preparing mixed products of sulfide, sodium sulfide and ammonium sulfate with manganese-containing waste liquid. The manganese-containing waste liquid is obtained from the production of hydroquinone containing manganese waste. Background technique [0002] Hydroquinone is an important organic intermediate, which was developed in my country in the 1970s and has been put into industrial production. At present, hydroquinone is mainly produced by the aniline-manganese dioxide process in China. Compared with the foreign phenol-hydrogen peroxide process, this process has the advantages of high product purity and less impurities. But its disadvantage is that the discharge of waste liquid is large. Under normal conditions, there are about 40 tons of manganese-containing wastewater for every ton of hydroquinone produc...

AI Technical Summary

Problems solved by technology

[0004] However, other chemical constituents in hydroquinone are not utilized, thereby wasting resources