Treatment method of electrolytic manganese residue

Abstract

The invention discloses a treatment method of electrolytic manganese residue. Electrolytic manganese anode liquor is adopted for high-pressure flushing of electrolytic manganese slagging slurry, the characteristics of high acid and low manganese of the electrolytic manganese anode liquor are matched with the high pressure condition, manganese residue filer cake slurrying is thorough, the recyclingrate of manganese metal and ammonium sulfate in the manganese residue can be greatly improved, a filter cake is subjected to washing by clean water on a filter press, the defects that after manganeseresidue compaction, cleaning is carried out, the cleaning effect is not obvious, and the manganese residue is not prone to being dissolved into liquor can be overcome, the acid soluble manganese andthe ammonium sulfate can be efficiently recycled, the clean water consumption amount is reduced, on the filter press, the filter cake is subjected to alkali cleaning, the alkali liquor is put into thefilter press, and perpendicularly penetrates through the filter cake and continuously circulates, curing of residual manganese in the manganese residue and removing of ammonia nitrogen are achieved,the solid liquid ratio is large, the drug consumption amount is obviously reduced, according to the treatment method of the electrolytic manganese residue, the water soluble manganese recycling rate is larger than or equal to 90%, the recycling ammonium sulfate is larger than or equal to 90%, the manganese residue water containing rate is smaller than or equal to 28%, and the aim of harmless treatment of electrolytic manganese residue is achieved.

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