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Method for removing fluorine and chlorine by combined process of alkaline washing and extraction of zinc ash material

A combined process and alkaline washing technology, applied in the field of wet smelting, achieves significant economic and social benefits, reduces the volume of alkaline washing water, and reduces costs

Active Publication Date: 2015-11-18
GREENNOVO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the above problems, to propose a method for removing fluorine and chlorine in zinc ash material alkaline washing and extraction combined process, which can effectively remove fluorine and chlorine in zinc ash with high fluorine and chlorine content, and make this type The material can be recycled through the wet zinc smelting process, and the water consumption in the alkali washing process should be reduced. At the same time, the method should also have the characteristics of high concentration of chloride ions in the alkali washing water and good process stability, so as to make up for the shortcomings of the existing technology. insufficient

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  • Method for removing fluorine and chlorine by combined process of alkaline washing and extraction of zinc ash material

Examples

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Effect test

example 1

[0027] Example 1: The main components of a certain zinc ash 1 are as follows:

[0028] element Zinc % Lead % Chlorine % Fluorine % iron % Indium % content 52.8 8.4 7.3 0.49 3.5 0.043

[0029] Using the following treatment process:

[0030] (1) Pulping alkali washing: transport 5 tons of zinc ash to the pulping tank, which is a mechanical stirring tank with a volume of 30m 3 , using the stripped liquid produced by stripping (the main component is water, if there is no such stripped liquid in advance, it can be replaced by water) as the pulping solution, and the liquid-solid ratio is controlled by returning part of the alkali washing water to the pulping tank 4:1, start the agitator and stir evenly, then add sodium hydroxide, sodium carbonate, etc. to carry out alkali cleaning operation. During the alkaline cleaning process, control the alkaline cleaning time for 1h, the alkaline cleaning temperature at 80°C, and adjust the final pH to 10. ...

example 2

[0034] Example 2: The main components of a certain zinc ash 2 are as follows:

[0035] element Zinc % Lead % Chlorine % Fluorine % iron % Indium % content 22 17 24 1.5 1.2 ——

[0036] Using the following treatment process:

[0037] (1) Pulping alkali washing: transport 2.5 tons of the zinc ash to the pulping tank, which is a mechanical stirring tank with a volume of 30m 3 , use the back-extracted liquid produced by back-extraction as the pulping solution, mix the liquid-solid ratio into the pulping tank by returning part of the alkali washing water to control the liquid-solid ratio to 8:1-10:1, start the agitator and stir evenly, add sodium hydroxide, Sodium carbonate, etc. are used for alkali cleaning operations. During the alkali cleaning process, the alkali cleaning time is controlled for 2 hours, the alkali cleaning temperature is 85°C, and the pH at the end point is adjusted to 11. The output of alkali washing water contains 71g / L of...

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Abstract

The invention relates to a method for removing fluorine chlorine of a zinc ash material by the alkali washing extracting combined process. The method comprises the following steps of: slurrying by using the zinc ash with high fluorine chlorine content; adding alkali and raising the temperature to perform alkali washing; filtering to obtain filter residue and filtrate of alkali washing; performing alkali washing again when the concentration of chloride ion in the filtrate is lower than 40g / L, or opening for recovering chlorine salt when the concentration of chloride ion in the filtrate is higher than 40g / L; rinsing the filter residue of alkali washing to obtain the rinsing water and rinsed zinc ash; leaching the rinsed zinc ash with sulfuric acid to obtain a zinc sulfate solution and the leaching residue; applying the leaching residue to smelt by wet way; extracting the zinc sulfate solution to remove fluorine chlorine ions; performing electrodeposition for extracting liquid to recover zinc; washing the extracted loaded organic phase with clean water or a low-acid solution to remove impurities so as to obtain pure organic phase and washing liquid; treating the organic phase by reverse extraction and impurity removal to remove fluorine chlorine; extracting the cycling organic phase again to remove fluorine chlorine; and applying the reverse extraction liquid to slurry and alkali washing. With the adoption of the method, the purpose of removing impurities and eradicating the harmful substances in high fluorine chlorine content zinc ash which exceeds several times of the processing limit of the existing fluorine chlorine removal method with high efficiency and low cost is reached; a new source of qualified raw materials is provided for electric zinc production; in addition, the method does not discharge any waste liquid and waste, so that the environment protection, economic and social benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for removing fluorine and chlorine through a combined process of alkaline washing and extraction of zinc ash materials. Background technique [0002] With the continuous depletion of zinc ore resources, more and more attention has been paid to the use of zinc ash with high fluorine and chlorine content for wet production of electrolytic zinc. However, under normal circumstances, zinc ash contains a large amount of fluorine and chlorine in the form of compounds, generally ranging from 0.5% to 2% of fluorine and 1% to 20% of chlorine. If these impurity components are not removed, the subsequent electrolysis operation will be seriously affected. How to effectively remove such harmful impurities has always been a problem that people have not solved well. [0003] At present, the common methods for defluorinating zinc ash in the zinc smelting industry include fire m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B3/44C25C1/16
CPCY02P10/214Y02P10/234Y02W30/54Y02P10/20
Inventor 童晓忠李春林王浩洋马黎阳
Owner GREENNOVO ENVIRONMENTAL TECH CO LTD