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Method for extracting zinc from low-grade zinc-containing material leachate

A low-grade, leaching liquid technology, applied in the field of metallurgy, can solve the problems of reducing economic benefits, increasing production costs, increasing concentration, etc., and achieves the effects of wide adaptability, high-efficiency extraction and enrichment, and high-efficiency extraction and recovery.

Active Publication Date: 2017-06-16
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the most widely used zinc extractant, P204 has poor selectivity to zinc. During the extraction process, a large amount of acid is released, resulting in a decrease in pH, which makes the extraction of zinc incomplete. The zinc concentration in the system needs to be opened.
In the domestic reported factories using P204 to extract zinc, the extraction recovery rate of zinc is only 60%~70%. During the production process, zinc is continuously accumulated in the solution, and it needs to be neutralized step by step or combined with traditional zinc smelting process for zinc extraction. Open circuit, which complicates the production process, increases production costs and reduces economic benefits

Method used

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  • Method for extracting zinc from low-grade zinc-containing material leachate
  • Method for extracting zinc from low-grade zinc-containing material leachate
  • Method for extracting zinc from low-grade zinc-containing material leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, for the low-grade zinc calcined sand leach solution 1#, the zinc concentration is 45.50g / L, and the pH value is 4.5 after iron removal and purification. Mix 70% aviation kerosene with 30% (volume percentage) of P204 to extract the organic phase. Add 2.00L of zinc sulfate solution containing 0.50g / L of zinc per 1L of leaching solution to dilute to obtain 3.00L of extraction stock solution containing 15.50g / L of zinc; the stock solution and the organic phase are subjected to three-stage countercurrent extraction, and the O:A ratio is 2:1 , the extraction time is 5 minutes, the phase separation time is 3 minutes, the zinc concentration of the raffinate is 0.58g / L, and the zinc-loaded organic phase contains 8.01g / L of zinc; after extraction, 1L of the raffinate is returned to leaching, and the remaining 3.68L of the raffinate is added to the lime And to filter after pH value 4.5, filtrate stays to use for next dilution; Load zinc organic phase an...

Embodiment 2

[0032] Such as figure 1 As shown, for low-grade zinc oxide ore acid leaching solution 2#, the zinc concentration is 26.38g / L, and the pH value is 4.5 after iron removal and purification. Mix 60% aviation kerosene with 40% (volume percentage) of P204 to extract the organic phase. Add 2.41L of zinc sulfate solution containing 3.21g / L of zinc to each 1L of leaching solution to dilute to obtain 3.41L of extracting solution containing 10.0g / L of zinc; the extracting solution and the organic phase are subjected to four-stage countercurrent extraction, and the ratio of O:A is 1:2 , the extraction time is 5 minutes, the phase separation time is 3 minutes, the zinc concentration of the raffinate is 3.21g / L, and the zinc-loaded organic phase contains 13.58g / L of zinc; after the extraction, 1L of the raffinate is returned to leaching, and the remaining 2.41L is added to lime to neutralize the pH value 4.5 Reserved for the next dilution; zinc-loaded organic phase and zinc electrowinning ...

Embodiment 3

[0034] Such as figure 1 As shown, for low-grade zinc sulfide ore oxygen pressure leaching solution 3#, the zinc concentration is 35.34g / L, and the pH value is 4.5 after iron removal and purification. Mix 60% aviation kerosene with 40% (volume percentage) of P204 to extract the organic phase. Add 1.57L of zinc sulfate solution containing 4.96g / L of zinc to each 1L of leaching solution to dilute to obtain 2.57L of extracting liquid containing 16.76g / L of zinc; the extracting liquid and the organic phase are subjected to four-stage countercurrent extraction, and the O:A ratio is 1.4:1 , the extraction time is 5 minutes, the phase separation time is 3 minutes, the zinc concentration of the raffinate is 4.96g / L, and the zinc-loaded organic phase contains 8.43g / L of zinc; after the extraction, 1L of the raffinate is returned to leaching, and the remaining 1.57L is added to lime to neutralize the pH value 4.5 Reserved for the next dilution; zinc-loaded organic phase and zinc electro...

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Abstract

The invention relates to a method for extracting zinc from a low-grade zinc-containing material leaching liquid and belongs to the technical field of metallurgy. According to the method, di(2-ethylhexyl phosphoric acid) and No. 260 aviation kerosene constitute an extraction organic phase, Zn<2+> is extracted from the low-grade zinc-containing material leaching liquid, reverse extraction is performed with zinc electrodeposition waste liquid and thus the recovery of zinc in the leaching liquid can be effectively achieved. The method is characterized by comprising the following steps of firstly preparing a zinc sulfate solution with a certain concentration according to the concentration of zinc in the leaching liquid and the extraction effect of the used extractant, diluting the leaching liquid with the zinc sulfate solution and extracting the diluted solution so that all zinc in the leaching liquid is enriched into the organic phase; returning a part of raffinate for extracting and neutralizing a part of raffinate with lime and recycling for dilution. By the steps of diluting, extracting, neutralizing and recycling, Zn<2+> can be efficiently extracted and enriched and the extraction recovery rate of zinc in the leaching liquid reaches above 98%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for extracting zinc from leachate of low-grade zinc-containing materials. Background technique [0002] At present, most of the zinc concentrates are processed by the traditional roasting-leaching-electrowinning process. In order to obtain better economic benefits, it is generally required that the zinc content of the roasted ore should be more than 55%. For low-grade zinc-containing materials such as oxide ore and zinc-containing slag, due to their low zinc content and low zinc concentration in the leaching solution, they cannot be connected with the current zinc electrowinning process, and separation and enrichment is required. Extraction is a suitable method for separation and enrichment commonly used at present, but the existing methods for extracting zinc have many limitations and are difficult for industrial application. [0003] The extraction of z...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/40C22B19/20
CPCY02P10/20
Inventor 谢刚崔涛李怀仁和晓才彭建蓉袁野徐庆鑫李小英魏可赖浚柯浪徐俊毅
Owner KUNMING METALLURGY INST
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