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Chlorine removal method for recycle use

A technology for recycling and dechlorination, applied in the field of wet smelting, can solve problems such as incomplete dechlorination, and achieve the effects of significant social comprehensive benefits, simple process and improved comprehensive recovery rate.

Inactive Publication Date: 2013-01-02
江西自立环保科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, chlorine removal is not complete, and resin regeneration consumes acid and produces a large amount of waste water

Method used

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  • Chlorine removal method for recycle use

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Embodiment Construction

[0042] The present invention can be further described by the following examples, however, the scope of the present invention is not limited to the following examples. Contains high concentrations of chloride ions

[0043] Such as: hydrometallurgy zinc dechlorination

[0044] (1) Acidification: The pH value of the neutral leachate of zinc hydrometallurgy is generally >5.2; the pH value of the leachate of the neutral leachate should be adjusted to 2.0-3.5 with zinc electrolysis waste liquid.

[0045] (2) Chlorine removal: The neutral leaching solution requires the chlorine content to be less than 200mg / L. The neutral leaching solution is based on the chlorine content of the liquid plus 1-1.5 times the theoretical amount of Cu 2 O, reaction precipitation in acidification solution; precipitation temperature 2 O and CI 1- Insoluble Cu 2 CI 2 precipitation.

[0046] (3) Filtration: prevent oxidation, quickly separate and precipitate Cu 2 CI 2 , Washing with acid water can ac...

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Abstract

The invention discloses a chlorine removal method for recycle use. The method is characterized in that the method comprises the following steps: combining red powder which is a chlorine removal agent Cu2O with chloride ions in a leachate to generate a white precipitate Cu2Cl2, and filtering a liquid to obtain a chlorine qualified liquid and chlorine removal residues; reacting the chlorine removal residues with an alkali to reduce to the red powder precipitate Cu2O and a sodium chloride solution; and filtering to obtain a solid phase which is water-containing regenerated Cu2O which can be recycled to remove chlorine as the chlorine removal agent, and evaporating and crystallizing the liquid phase which is the sodium chloride solution to produce sodium chloride crystals. According to the invention, the chlorine removal agent Cu2O is used to remove chlorine, but chlorine is removed through the action of the alkali after conversion; and a large amount of the chlorine removal agent Cu2O is used for the first time, and then the regenerated Cu2O is used for chlorine removal, and a trace amount of lost Cu2O is supplemented. The method has the advantages of advanced and simple technology, no wastewater discharge, and substantially reduced cost.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for removing chlorine that can be recycled and utilized. Background technique [0002] In the process of zinc hydrometallurgy, since the treated zinc calcine, various dust, zinc oxide and other zinc-containing materials (such as casting slag and galvanizing slag, etc.) contain a certain amount of chlorine, the chlorine in these materials is leached During the process, almost all went into solution. At the same time, because the whole system uses a large amount of tap water, a certain amount of chlorine is also brought in. The presence of chlorine affects the zinc electrowinning process, causing corrosion of the lead anode and equipment, increasing the lead content in the electrowinning solution, and reducing the quality of zinc precipitated from the cathode. The hazards of chloride ions cannot be ignored. Chloride ions have a small radius and are easy to penetra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04
CPCY02P10/20
Inventor 叶标施文山
Owner 江西自立环保科技有限公司
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