Method for improving content of ferrous iron in leaching liquid during zinc oxide smoke and dust leaching process

A zinc oxide and leaching solution technology, applied in the field of zinc hydrometallurgy, can solve the problems of large fluctuation in content, difficult to control, affecting the production of the subsequent process, etc., and achieve the effects of improving economic and technical indicators, simple process and convenient operation.

Active Publication Date: 2018-03-02
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Abstract
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  • Application Information

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Problems solved by technology

However, during the leaching process of zinc oxide fumes from hydrometallurgy, due to the influence of raw material iron content fluctuations, process temperature, acidity, reaction time, etc., after leaching, Fe 2+ The content of the content fluctuates greatly, it is difficult to control, directly affects the production of the subsequent process, and it is difficult to meet the production process control requirements

Method used

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  • Method for improving content of ferrous iron in leaching liquid during zinc oxide smoke and dust leaching process
  • Method for improving content of ferrous iron in leaching liquid during zinc oxide smoke and dust leaching process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) In the zinc oxide fume two-stage acid leaching process, the one-stage acid leaching underflow with a liquid-to-solid ratio of 2 to 3:1 obtained by the one-stage acid leaching is respectively introduced into the second-stage acid leaching 1# reaction tank and the second-stage acid leaching 2 # In the reaction tank, the underflow of the first stage of acid leaching into the second stage of acid leaching 1# reaction tank is 10 m 3 / h, the underflow of the first stage of acid leaching into the second stage of acid leaching 2# reaction tank is 30 m 3 / h, add roasting dust and waste electrolyte into the second stage acid leaching 1# reaction tank, the main components of roasting dust are Zn 45-50 wt%; Fe 8-11 wt%; S 2.5-4.5 wt%, and the added amount is 1 t / h, the electrolyte contains H + 160~170 g / L, containing Zn 2+ 50~55 g / L, fully agitate the reaction; add calcine to the second stage acid leaching 2# reaction tank to extract acid underflow, pyrite concentrate and concentr...

Embodiment 2

[0033] 1) In the zinc oxide fume two-stage acid leaching process, the one-stage acid leaching underflow with a liquid-to-solid ratio of 2 to 3:1 obtained by the one-stage acid leaching is respectively introduced into the second-stage acid leaching 1# reaction tank and the second-stage acid leaching 2 # In the reaction tank, the underflow of the first stage of acid leaching into the second stage acid leaching 1# reaction tank is 30 m 3 / h, the underflow of the first stage of acid leaching into the second stage of acid leaching 2# reaction tank is 50 m 3 / h, add roasting dust and waste electrolyte into the second stage acid leaching 1# reaction tank, the main components of roasting dust are Zn 45-50 wt%; Fe 8-11 wt%; S 2.5-4.5 wt%, and the added amount is 3 t / h, the electrolyte contains H + 160~170 g / L, containing Zn 2+ 50~55 g / L, fully agitate the reaction; add calcine to the second stage acid leaching 2# reaction tank to extract acid underflow, pyrite concentrate and concentrate...

Embodiment 3

[0039] 1) In the zinc oxide fume two-stage acid leaching process, the one-stage acid leaching underflow with a liquid-to-solid ratio of 2 to 3:1 obtained by the one-stage acid leaching is respectively introduced into the second-stage acid leaching 1# reaction tank and the second-stage acid leaching 2 # In the reaction tank, the underflow of the first stage of acid leaching into the second stage of acid leaching 1# reaction tank is 40 m 3 / h, the underflow of the first stage of acid leaching into the second stage of acid leaching 2# reaction tank is 60 m 3 / h, add roasting dust and waste electrolyte into the second stage acid leaching 1# reaction tank, the main components of roasting dust are Zn 45-50 wt%; Fe 8-11 wt%; S 2.5-4.5 wt%, and the added amount is 4 t / h, the electrolyte contains H + 160~170 g / L, containing Zn 2+ 50~55 g / L, fully agitate the reaction; add calcine to the second stage acid leaching 2# reaction tank to extract acid underflow, pyrite concentrate and concentr...

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Abstract

The invention relates to a method for improving the content of ferrous iron in leaching liquid during the zinc oxide smoke and dust leaching process, and belongs to the field of zinc hydrometallurgy.The method comprises the steps that in the second-stage acid leaching process of zinc oxide, first-stage acid leaching bottom flow is guided into a second-stage acid leaching 1# reaction tank and a second-stage acid leaching 2# reaction tank, roasted dust and waste electrolyte are added into the second-stage acid leaching 1# reaction tank, roasted sand leaching acid bottom flow, sulfur concentrateand concentrated sulfuric acid are added into the second-stage acid leaching 2# reaction tank, full reaction is conducted, then mixing is conducted, and a mixture is guided into a second-stage acid leaching 3# reaction tank for further reaction, obtained high-iron second-stage acid leaching ore pulp is filtered, so that lead slag and high iron liquid are obtained; and the high iron liquid returnsto a first-stage acid leaching process for first-stage acid leaching iron supplement. Through the method for improving the content of the ferrous iron in the leaching liquid during the zinc oxide smoke and dust leaching process, the content of Fe2+ in the high iron liquid is improved to 16000-22000 mg / L, so that it is ensured that the content of first-stage acid leaching Fe2+ is stably controlledto be 5000-6000 mg / L, and smoothing carrying out of the neutralizing and impurity removing process of subsequent stages is ensured.

Description

Technical field [0001] The invention belongs to the field of zinc hydrometallurgy, and specifically relates to a method for increasing the content of divalent iron in the leaching solution during the leaching process of zinc oxide soot. Background technique [0002] At present, the two-stage acid leaching process is commonly used in the domestic and foreign wet zinc smelting zinc oxide soot leaching process. The underflow after one acid leaching is subjected to two stages of high temperature and high acid acid leaching, and the filtrate obtained after two stages of acid leaching treatment is returned to one stage of acid leaching . [0003] Fe during a period of acid leaching 2+ The content will directly affect the follow-up goethite neutralization and impurity removal effect, and has a direct effect on the content of impurities such as As, Ge, TOC in the control system, so it is necessary to control a stage of acid leaching Fe during the leaching process of zinc oxide fume 2+ The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02
CPCC22B7/007C22B7/02Y02P10/20
Inventor 罗永光蒋荣生俞兵赵世龙陈波顾利坤张宏徐德胜何宗云李云卢文鹏张路飞朱培海吕朝东张勤念
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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