A method for increasing the content of divalent iron in the leach solution during the leaching process of zinc oxide smoke and dust

The technology of zinc oxide and leaching solution is applied in the field of zinc hydrometallurgy, which can solve the problems of large fluctuation of content, difficult control, and influence on the production of subsequent processes, and achieves the effects of simple process, improved economic and technical indicators, and convenient operation.

Active Publication Date: 2019-06-28
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Abstract
  • Description
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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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  • A method for increasing the content of divalent iron in the leach solution during the leaching process of zinc oxide smoke and dust
  • A method for increasing the content of divalent iron in the leach solution during the leaching process of zinc oxide smoke and dust

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Effect test

Embodiment 1

[0027] 1) In the two-stage acid leaching process of zinc oxide dust, the first-stage acid leaching underflow obtained by the first-stage acid leaching with a liquid-solid ratio of 2 to 3:1 is respectively introduced into the second-stage acid leaching 1# reaction tank and the second-stage acid leaching 2 # In the reaction tank, the first-stage acid leaching bottom flow entering the second-stage acid leaching 1# reaction tank is 10 m 3 / h, the first-stage acid leaching bottom flow into the second-stage acid leaching 2# reaction tank is 30 m 3 / h, add roasted dust and waste electrolyte in the second-stage acid leaching 1# reaction tank, the main components of roasted dust are Zn 45~50 wt%; Fe 8~11 wt%; S 2.5~4.5wt%, the addition amount is 1 t / h, the electrolyte contains H + 160~170 g / L, containing Zn 2+ 50-55 g / L, fully stirred for reaction; add calcined leaching acid underflow, sulfur concentrate, concentrated sulfuric acid into the second-stage acid leaching 2# reaction ta...

Embodiment 2

[0033] 1) In the two-stage acid leaching process of zinc oxide dust, the first-stage acid leaching underflow obtained by the first-stage acid leaching with a liquid-solid ratio of 2 to 3:1 is respectively introduced into the second-stage acid leaching 1# reaction tank and the second-stage acid leaching 2 # In the reaction tank, the first-stage acid leaching bottom flow entering the second-stage acid leaching 1# reaction tank is 30 m 3 / h, the first-stage acid leaching bottom flow entering the second-stage acid leaching 2# reaction tank is 50 m 3 / h, add roasted dust and waste electrolyte in the second-stage acid leaching 1# reaction tank, the main components of roasted dust are Zn 45~50 wt%; Fe 8~11 wt%; S 2.5~4.5wt%, the addition amount is 3 t / h, the electrolyte contains H + 160~170 g / L, containing Zn 2+50-55 g / L, fully stirred for reaction; add calcined leaching acid underflow, sulfur concentrate, concentrated sulfuric acid into the second-stage acid leaching 2# reaction ...

Embodiment 3

[0039] 1) In the two-stage acid leaching process of zinc oxide dust, the first-stage acid leaching underflow obtained by the first-stage acid leaching with a liquid-solid ratio of 2 to 3:1 is respectively introduced into the second-stage acid leaching 1# reaction tank and the second-stage acid leaching 2 # In the reaction tank, the first-stage acid leaching bottom flow entering the second-stage acid leaching 1# reaction tank is 40 m 3 / h, the first-stage acid leaching bottom flow into the second-stage acid leaching 2# reaction tank is 60 m 3 / h, add roasted dust and waste electrolyte in the second-stage acid leaching 1# reaction tank, the main components of roasted dust are Zn 45~50 wt%; Fe 8~11 wt%; S 2.5~4.5wt%, the addition amount is 4 t / h, the electrolyte contains H + 160~170 g / L, including Zn 2+ 50-55 g / L, fully stirred for reaction; add calcined leaching acid underflow, sulfur concentrate, concentrated sulfuric acid into the second-stage acid leaching 2# reaction tan...

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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 in particular relates to a method for increasing the content of divalent iron in a leach solution during the leaching process of zinc oxide fumes. Background technique [0002] At present, two-stage acid leaching process is generally used in the leaching process of zinc oxide fume from wet smelting at home and abroad. The underflow after one-stage acid leaching is subjected to two-stage high-temperature high-acid acid leaching, and the filtrate obtained after two-stage acid leaching is returned to one-stage acid leaching. . [0003] During an acid leaching process Fe 2+ The level of content will directly affect the quality of subsequent goethite neutralization and impurity removal, 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 period of acid leaching Fe 2+ The content of Fe is in the range of 5000-6000 mg / l...

Claims

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Application Information

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Patent Type & Authority Patents(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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