Method for producing sodium sulfide crystal by using electrowinning lean solution

Abstract

The invention discloses a method for producing a sodium sulfide crystal by using an electrowinning lean solution. The method comprises the following steps: 1, evaporating and crystallizing the lean solution: evaporating the electrowinning lean solution in 100 DEG C hot water, cooling and crystallizing the evaporated solution at room temperature, filtering the crystallized solution, and performingnatural drying and weighing, wherein a product obtained after the crystallization is sodium sulfide, and can be applied as a leaching agent to a leaching system adopting sodium sulfide self-produced after sulfation and crystallization during antimony leaching; 2, adding the crystallized sodium sulfide obtained in step 1 in a dissolving liquid to form a sodium sulfate solution; 3, neutralizing andpurifying the sodium sulfate solution; and 4, performing reduction to prepare a sodium chloride product. The electrowinning lean solution is evaporated and crystallized to produce the sodium sulfide crystal, and the sodium sulfide crystal returns to a leaching workshop section and is afresh used in production, so the use amount of the sodium sulfide agent is reduced, impurities are removed from anelectrolyte, and the electrowinning process is optimized.

Description

technical field [0001] The invention relates to a method for producing sodium sulfide crystals, in particular to a method for producing sodium sulfide crystals by using electrowinning barren solution, and belongs to the technical field of metallurgy. Background technique [0002] Electrowinning is a term for hydrometallurgy, which is to electrolytically deposit the extracted and enriched solution containing metal ions to produce cathode metal. In hydrometallurgy, electrowinning is the electrolytic deposition of extracted and enriched antimony solution to produce cathode antimony. The antimony concentration of the electrolysis liquid is generally 45-50g / L, and the antimony concentration of the electrolysis liquid is 20-30g / L. The electrolytic poor solution is returned to the extraction and used as a stripping agent. According to the accumulation of iron in it, a small amount of the poor solution is extracted and returned to leaching to maintain the balance of iron. The elect...

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Problems solved by technology

The electrolytic poor solution is returned to the extraction and used as a stripping agent. According to the accumulation of iron in it, a small amount of the poor solution is extracted and returned to leaching to maintain the balance of iron. The electrolytic poor solution contains a large amount of sodium sulfide reagent and impurities such as sulfate and sulfite , the impurity ions have a great influence on the electrowinning process, which deteriorates the electrowinning process, reduces the electrolytic efficiency, causes waste of chemicals, and increases production costs

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