Treatment method for zinc oxygen pressure leaching solution

A treatment method and solution technology are applied in the treatment field of zinc-oxygen pressure leaching solution, which can solve the problems of difficulty in ensuring that zinc oxide does not bring fluorine chloride ions, zinc loss, etc., and achieves the effect of reducing the amount of lime and solving the enrichment and recovery.

Active Publication Date: 2018-12-21
CINF ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high content of fluorine and chlorine in zinc oxide materials, even if zinc oxide is defluorinated and chlorine-treated by fire or wet methods, it is difficult to ensure that zinc oxide does not bring in fluoride and chloride ions when zinc oxide is used as a neutralizing agent. The increase of chloride ions will cause the burning plate of zinc electrolysis
If lime is used as neutralizing agent, a large amount of neutralized gypsum slag will be produced, resulting in the loss of zinc

Method used

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  • Treatment method for zinc oxygen pressure leaching solution

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Embodiment 1

[0036] In this embodiment, the treatment method of the zinc oxygen pressure leaching solution is: take 1L of the neutralized zinc oxygen pressure leaching solution (Zn 2+ : 160g / L), washing water 3.5L (Zn 2+ : 40g / L, H 2 SO 4 : 4g / L), add lime 0.36kg (CaO90%), control the reaction temperature 60 ℃, the reaction time 2h, the end point pH = 8, the output of 2.45L of neutralized precipitate, 2.45L of neutralized precipitate, added to 24L Zinc oxygen pressure leaching solution (Zn 2+ : 160g / L, H 2 SO 4 : 10g / L), controlled reaction temperature 80℃, reaction time 3.5h, end point pH=4, obtained qualified neutralized solution (Zn 2+ : 160g / L), the output of gypsum slag is 0.56kg (Zn content is 0.3wt%).

Embodiment 2

[0038] In this embodiment, the treatment method of the zinc oxygen pressure leaching solution is: take 1L of the neutralized zinc oxygen pressure leaching solution (Zn 2+ : 160g / L), washing water 3.5L (Zn 2+ : 40g / L, H 2 SO 4 : 4g / L), add lime 0.4kg (CaO90%), control the reaction temperature at 50°C, the reaction time is 1.5h, the end point pH=7, the output of 2.4L of neutralized precipitate, 2.4L of neutralized precipitate, added to 24L zinc oxygen pressure leaching solution (Zn 2+ : 160g / L, H 2 SO 4 : 10g / L), the reaction temperature was controlled at 70°C, the reaction time was 3h, and the end point pH=5 to obtain a qualified neutralized solution (Zn 2+ : 160g / L), the output of gypsum slag is 0.6kg (Zn content is 0.4wt%).

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Abstract

The invention relates to a treatment method for zinc oxygen pressure leaching solution. The treatment method includes the steps that neutralizing precipitate is added to the zinc oxygen pressure leaching solution, reaction is carried out until the pH value of the solution is 4-5, and the neutralized solution and gypsum slag are obtained; the gypsum slag is washed to obtain washing water; a mixtureis obtained by mixing partial neutralized solution with the washing water, then lime is added to the mixture, reaction is carried out until the pH value of the mixture is 7-8, and neutralized precipitate is obtained; and wherein, the neutralized precipitate comprises a hydroxide containing CaSO4 and zinc. According to the treatment method for the zinc oxygen pressure leaching solution, neutralizer (hydroxide of zinc) is self-circulation, additional zinc-containing materials adding to a production system is not required, the zinc content used as the zinc hydroxide neutralizer is approximately10% of that of the main production system, the zinc-containing content of the gypsum slag is greatly reduced, the required lime quantity is little, the neutralized precipitate is prepared by mixing the lime with the neutralized solution and the washing water, and the problem of zinc enriching and recovering in the washing water is solved.

Description

technical field [0001] The invention relates to a method for treating a zinc-oxygen pressure leaching solution, belonging to the field of hydrometallurgy. Background technique [0002] The solution produced by oxygen pressure leaching of zinc sulfide concentrate generally contains high acid content, and the excess acid needs to be neutralized before entering the next process. The neutralizers used in production are generally divided into two types, one is zinc calcined sand Or zinc oxide, the other is lime. The advantage of using zinc calcine or zinc oxide as a neutralizing agent is that the neutralized slag produced after neutralization will not be discharged outside, and can be returned to the autoclave for leaching or sent to fire to process and recover zinc. Using this process, zinc can be effectively recovered, but there are also The disadvantage is that it is necessary to build a supporting zinc calcine or zinc oxide production unit, or through outsourcing, which will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B19/20
CPCC22B3/44C22B19/26Y02P10/20
Inventor 王恒辉杨建平刘自亮罗虹霖王宇佳王邕舟陈龙义左小红仝一喆舒见义何醒民
Owner CINF ENG CO LTD
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