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Method for mineralizing precipitated iron from zinc hydrometallurgy lixivium

A technology of hydrometallurgy and leaching solution, which is applied in the field of chemical industry and metallurgy, can solve the problems of high disposal cost, low separation efficiency of zinc and iron, and high content of heavy metals, and achieve low content of harmful elements, high separation efficiency of zinc and iron, mineralization and precipitation of iron high rate effect

Active Publication Date: 2022-07-29
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As the national environmental protection policy becomes more and more stringent, the alumina slag and goethite slag produced during the hydrometallurgy process are included in the national hazardous waste list, which poses a high risk of environmental pollution and high follow-up disposal costs
In addition, due to the low content of iron and high content of heavy metals such as lead and zinc in the iron slag and goethite slag, it is difficult to recycle and dispose of them
The slag produced by the hematite iron removal method has a high iron content and can be used as a raw material for cement or ironmaking. However, the iron removal by the hematite method requires high temperature and high pressure conditions of 180°C to 200°C and 1.8 to 2.0MPa. The hematite product is obtained, the reaction conditions are harsh, and the iron-precipitated solution contains 3-6g / L iron ions, and the separation efficiency of zinc and iron is low

Method used

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  • Method for mineralizing precipitated iron from zinc hydrometallurgy lixivium

Examples

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Embodiment 1

[0030] A method for mineralizing and precipitating iron from a zinc hydrometallurgical leaching solution, the specific steps of which are as follows: take 5.0 L of the leaching solution containing zinc sulfate and ferrous sulfate produced by a wet zinc smelting production enterprise, and add it to a reaction kettle. The zinc ion concentration in the leaching solution is 130 g / L, and the iron ion concentration is 15 g / L. After heating the solution to 100°C, industrial oxygen with an oxygen content of 88% was introduced, and the oxygen partial pressure was controlled to be 0.3MPa, and then high-temperature steam was further introduced to maintain the reaction temperature at 135°C. 20 minutes after the oxygen was introduced into the reaction, the slurry of zinc oxide with a slurry concentration of 30% was pumped, and the zinc content in the zinc oxide was 62%. The pH value of the end point of the reaction was controlled to be 1.0, and the total reaction time was 180 minutes. Afte...

Embodiment 2

[0032] A method for mineralizing and precipitating iron from a zinc hydrometallurgical leaching solution, the specific steps of which are as follows: take 5.0 L of the leaching solution containing zinc sulfate and ferrous sulfate produced by a wet zinc smelting production enterprise, and add it to a reaction kettle. The zinc ion concentration in the leaching solution is 145g / L, and the iron ion concentration is 6.5g / L. After heating the solution to 90°C, industrial oxygen with an oxygen content of 80% was introduced, and the oxygen partial pressure was controlled to be 0.1 MPa, and then high-temperature steam was further introduced to maintain the reaction temperature at 100°C. 30 minutes after the reaction started by feeding oxygen, the slurry of zinc oxide with a slurry concentration of 30% was pumped, and the content of zinc in the zinc oxide was 60%. The pH value of the end point of the reaction was controlled to be 2.0, and the total reaction time was 90 minutes. After th...

Embodiment 3

[0034] A method for mineralizing and precipitating iron from a zinc hydrometallurgical leaching solution, the specific steps of which are as follows: taking 5.0 L of the leaching solution containing zinc sulfate and ferrous sulfate produced by a hydrometallurgical zinc smelting enterprise, and adding it to a reaction kettle. The zinc ion concentration in the leaching solution is 120.0g / L, and the iron ion concentration is 25.5g / L. After heating the solution to 100°C, industrial oxygen with an oxygen content of 90% was introduced, and the partial pressure of oxygen was controlled to be 0.5MPa, and then high-temperature steam was further introduced to maintain the reaction temperature at 135°C. Twenty-five minutes after the start of the reaction by introducing oxygen, the slurry of zinc oxide with a slurry concentration of 45% was pumped, and the content of zinc in the zinc oxide was 65%. The pH value of the end point of the reaction was controlled to be 0.8, and the total react...

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Abstract

The invention relates to a method for mineralizing precipitated iron from a zinc hydrometallurgy leaching solution, and belongs to the technical field of chemical metallurgy. The method comprises the following steps: adding a leaching solution containing zinc sulfate and ferrous sulfate produced by zinc hydrometallurgy into a reaction kettle, heating to A DEG C, starting to introduce oxygen, and controlling the oxygen partial pressure to be 0.1-0.8 MPa; further introducing high-temperature steam to maintain the reaction temperature at B DEG C; pumping ore pulp containing zinc oxide in the reaction process, controlling the pH value at the end point of the reaction to be 0.2-2.0, and performing liquid-solid separation after the reaction to obtain a mineralized iron precipitation product and a zinc sulfate solution after iron precipitation; wherein the value of A is 80 to 100; the value of B is 100-170, and B-A is less than or equal to 70. The method has the characteristics of thorough separation of zinc and iron, high iron content of an iron precipitation product, good mineralization precipitation effect of iron and the like.

Description

technical field [0001] The invention relates to a method for mineralizing precipitation iron from a zinc hydrometallurgical leaching solution, belonging to the technical field of chemical metallurgy. Background technique [0002] The separation of zinc and iron from the leaching solution is an indispensable process link in the hot acid leaching process of hydrometallurgy zinc, and it is also one of the technical difficulties of the hydrometallurgical zinc process. In order to solve the problem of the separation of zinc and iron in the leaching solution of the zinc hydrometallurgy process, scientific and technological workers at home and abroad have carried out extensive research, and successively developed iron removal by hydrolysis, iron removal by jarosite method, iron removal by goethite method and hematite method. Iron removal methods such as iron removal realize the separation of zinc and iron in the leaching solution, reduce the output of iron slag to a certain extent,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/44
CPCC22B19/26C22B3/44Y02P10/20
Inventor 李兴彬魏昶邓志敢李旻廷彭晓华罗兴国
Owner KUNMING UNIV OF SCI & TECH