A kind of treatment method of electrolytic manganese slag

Abstract

The method for treating electrolytic manganese slag in the present invention uses electrolytic manganese anolyte to flush the electrolytic manganese slag into slurry at high pressure, and the high-acid and low-manganese characteristics of the electrolytic manganese anolyte cooperates with high-pressure conditions to make the manganese slag filter cake into slurry thoroughly and greatly improve The recovery rate of metal manganese and ammonium sulfate in manganese slag; the filter cake is washed with water on the filter press, which avoids the disadvantages of inconspicuous washing effect and difficult manganese slag melting when manganese slag is compacted and then washed. Recover acid-soluble manganese and ammonium sulfate, while reducing water consumption; wash the filter cake with lye on the filter press, and the lye is poured into the filter press, vertically passing through the filter cake and continuously circulating, so as to realize the solidification of residual manganese in the manganese slag and ammonia nitrogen removal, the solid-to-liquid ratio is large, significantly reducing the consumption of chemicals; the treatment method of the electrolytic manganese slag of the present invention, the recovery rate of water-soluble manganese ≥ 90%, the recovery rate of ammonium sulfate ≥ 90%, the moisture content of manganese slag ≤ 28%, reaching The purpose of harmless treatment of electrolytic manganese slag.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a treatment method for electrolytic manganese slag. Background technique [0002] Electrolytic manganese slag is the filter residue produced during the electrolysis of manganese metal by leaching manganese carbonate ore powder with sulfuric acid. That is, add sulfuric acid solution in the reactor to react with manganese carbonate ore to generate manganese sulfate, and add a small amount of reducing agent when the pH value is close to 4, and the Fe in the solution 2+ Oxidize and hydrolyze the precipitate, then neutralize the excess acid with liquid ammonia; when the pH value is close to 7, add a vulcanizing agent to make the heavy metal ions in the solution form corresponding sulfide precipitates; then filter with a filter press, and the filtrate enters the electrolytic cell Electrolysis, the discharged filter cake is the so-called electrolytic manganese slag. Due to the exte...

AI Technical Summary

Problems solved by technology

Due to the extensive press filtration process, backward equipment and low degree of mechanical automation of the existing electrolytic manganese production, about 30%-35% of the electrolyte solution remains in the manganese slag, of which the concentration of manganese sulfate (calculated as Mn) is 30g / L-36g / L, resulting in higher manganese loss

In addition, the combined leaching is not complete, and about 1.5%-2.0% of the manganese carbonate in the manganese slag has not been converted into manganese sulfate in one acid leaching

In the leaching and filtration process alone, about 3%-4% of the manganese ore (accounting for 18%-25% of the total manganese content) is not utilized, which is a serious waste of resources

At present, foreign electrolytic manganese enterprises have relatively strict requirements on the treatment of electrolytic manganese waste residue, and generally use tail ponds for disposal, while most of the electrolytic manganese enterprises in my country adopt the method of damming and stockpiling, without any measures such as anti-seepage, sealing and leachate treatment , not only occupies a large amount of land, but also the harmful substances in the manganese waste residue will penetrate into the soil, surface water and groundwater, causing great harm to the environment