Method and system for separating salt from electrolytic manganese electrolyte salt slag

Abstract

The invention discloses an electrolytic manganese electrolyte salt residue salt separation method and system, and belongs to the field of wastewater treatment, and the system comprises a dissolving tank, a filter press, a primary buffer tank, a primary cooling crystallization system, a first centrifugal machine, a secondary vacuum crystallization system, a second centrifugal machine, a secondary buffer tank, a tertiary high temperature crystallization system, a filter press kettle and a concentrated discharge drying system. No agent is added, inorganic components of the electrolytic manganese residues are extracted according to basic physical properties of solid waste and physical separation, and the operation cost is low; inorganic salt is separated in a mother liquor circulation mode, the waste liquor discharge amount is small, and meanwhile a large amount of water resources are recycled. According to the method, the multi-component elemental salts (ammonium, magnesium and manganese) in the manganese slag are recovered in sequence instead of single-component salt recovery in the electrolytic manganese waste slag, the recovery rate is high, and the solid waste reduction treatment degree is high; the electrolytic manganese waste residue inorganic salt separation equipment mainly comprises a reactor and an evaporator, and is simple in system, low in equipment investment and easy to industrialize.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and system for separating salt from salt slag in an electrolytic manganese electrolyte. Background technique [0002] The main part of salt slag pollution in manganese electrolyte is electrolytic manganese acid leaching residue, which is huge and difficult to handle. my country's electrolytic manganese enterprises produce 1 ton of electrolytic manganese on average to produce 10-12 tons of electrolytic manganese slag. The output of electrolytic manganese in my country is more than 1 million tons, and 8-10 million tons of manganese slag is newly added every year, and the accumulation of manganese slag over the years is more than 50 million tons. Most enterprises in my country use landfill to dispose of manganese slag, and pile up a large amount of solid waste in the slag yard, and a large amount of soluble manganese salt, magnesium salt, and ammonium salt wil...

AI Technical Summary

Problems solved by technology

There are many cases of recovery of manganese in manganese electrolyte salt slag, such as magnetic separation, electric leaching, and hydrothermal leaching, but there are problems of high operating costs, low recovery rate, and low degree of solid waste reduction

The high operating cost has led to a large amount of stacking of manganese electrolyte salt slag. Under the background of low economic, environmental and social benefits of the existing treatment technology, it is urgent to develop a high recovery rate, high degree of solid waste reduction, Method and system for resource recovery in manganese electrolytic salt residue with low cost

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