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Low-grade zinc oxide extraction method

An extraction method and zinc oxide technology, applied in the field of ore smelting, can solve the problems of inability to carry out electrowinning recovery, high impurity content, low zinc concentration, etc., and achieve the effects of low cost, high metal recovery rate and improved purity

Active Publication Date: 2019-07-26
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for extracting low-grade zinc oxide, so as to solve the problem that the existing low-grade zinc oxide ore is difficult to be enriched by beneficiation, and the zinc concentration in the leaching solution after direct leaching is low and the impurity content is high, which cannot Problems with electrowinning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Leaching treatment:

[0034] The low-grade zinc oxide ore was leached with 0.61mol / L sulfuric acid. The liquid-solid ratio in the leaching treatment was 4:1, the leaching temperature was 30°C, the leaching time was 3.5h, the amount of sulfuric acid was 241kg / t, and the final pH value was 1.95. In the immersion solution, the concentration of zinc is 32.94g / L, and the leaching rate is 94.24%; the concentration of iron is 0.558g / L, and the leaching rate is 4.42%; the concentration of aluminum is 0.8g / L, and the leaching rate is 7.5%. ; The concentration of silica is 0.476g / L, and the leaching rate is 4.2%.

[0035] (2) The leaching solution is stirred with air at 70°C, the stirring speed is 700 rpm, and the pH value is 3.8 to 4.5. After removing metal impurities such as Fe and Ni under the above conditions, the leaching solution is extracted with P204 to obtain Zn. The leaching solution was extracted, the extraction rate of Zn was 53.23wt%, and the recovery rate of Zn...

Embodiment 2

[0037] The difference from Example 1 is: the consumption of sulfuric acid corresponding to each ton of low-grade zinc oxide is 270Kg, the liquid-solid ratio of low-grade zinc oxide and the leaching process is 2:1, and the endpoint pH value of the leaching solution is 1.74.

[0038] In the immersion solution, the concentration of zinc element is 30.95g / L, and the leaching rate is 92.57wt%; the concentration of iron element is 1.845g / L, and the leaching rate is 7.3wt%; the concentration of aluminum element is 1.424g / L, and the leaching rate is 1.424g / L. 13.35wt%; the concentration of silica is 0.629g / L, and the leaching rate is 5.55wt%.

[0039] The extraction rate of Zn from the leaching solution was 53.23wt%, and the recovery rate of Zn was 90.97wt%.

Embodiment 3

[0041] The difference from Example 1 is that the endpoint pH value of the leachate is adjusted to 5.

[0042]In the leaching solution, the concentration of zinc element is 29.64.g / L, the leaching rate is 88.44wt%; the concentration of iron element is 1.345g / L, the leaching rate is 5.32wt%; the concentration of aluminum element is 1.425g / L, the leaching rate is 13.36wt%; the concentration of silica is 0.473g / L, and the leaching rate is 4.00wt%.

[0043] The extraction rate of Zn from the leaching solution was 54.49wt%, and the recovery rate of Zn was 86.84wt%.

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Abstract

The invention provides a low-grade zinc oxide extraction method. The weight percentage of the zinc element in the low-grade zinc oxide is 1-13wt%, the extraction method comprises the following steps of leaching low-grade zinc oxide and sulfuric acid to obtain a leachate; extracting the leachate to obtain a zinc-containing extracting solution and an acid-containing raffinate; wherein in the leaching treatment step, the dosage of sulfuric acid corresponding to each ton of low-grade zinc oxide is 200-300 kg, and the liquid-solid ratio is (4-6): 1. According to the low-grade zinc oxide extractionmethod, the leaching of impurity metals in the low-grade zinc oxide ores can be inhibited by controlling the concentration of the sulfuric acid and the liquid-solid ratio of the reaction raw materials, so that the purity of the leachate can be improved, and the recovery rate of the zinc element can be improved by virtue of the extraction treatment; on the basis, the invention solves the problem that low-grade zinc oxide ores are difficult to be enriched by beneficiation, the concentration of the zinc in the leaching solution is low and cannot be directly recycled after the leaching solution isdirectly leached.

Description

technical field [0001] The invention relates to the field of ore smelting, in particular to a method for extracting low-grade zinc oxide. Background technique [0002] With the in-depth development of mineral resources, the treatment of oxidized ore has been paid more and more attention by people. Among them, zinc oxide ore is a low-grade ore that is difficult to handle. The ore has a deep oxidation degree, high content of calcium, magnesium and aluminum in alkaline minerals, and high leaching acid consumption. Zinc oxide ore treatment is usually enriched by pyrometallurgy. The typical process flow is: zinc oxide ore crushing - briquetting - blast furnace ore - smoke furnace volatilization - zinc oxide powder. Due to the disadvantages of high investment, large pollution and low recovery rate in the pyro-enrichment process, progress has been made in the research on the use of wet process to treat zinc oxide ore in recent years, and it has been applied to different degrees in...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/08C22B3/26C22B19/34
CPCC22B19/22C22B19/34C22B3/26Y02P10/20
Inventor 秦丽娟孙宁磊丁剑李勇彭建华
Owner CHINA ENFI ENGINEERING CORPORATION
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