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Oxidation iron removal method for removing iron from solutions containing iron and zinc by pressurizing oxygen-enriched air

A technology of oxygen-enriched air and oxidation iron removal, which is applied in the field of iron in zinc solution and pressurized oxygen-enriched air oxidation to remove iron. High-level problems, to achieve the effect of improving the quality of filter press, high iron removal efficiency, and balancing production costs

Inactive Publication Date: 2017-11-24
GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, for neutralizing oxidized goethite (FeOOH) or Fe(OH) 3 Iron removal method requires oxidant treatment, and in this process, chemical substances such as hydrogen peroxide or permanganate are commonly used as oxidants, resulting in high cost of neutralization and iron removal, and too fast oxidation iron removal speed, making It is easy to produce colloidal precipitation of ferric hydroxide, resulting in slower filtration speed in the later stage, and the alternating ions will also adsorb zinc ions in the solution, resulting in co-precipitation, resulting in higher zinc content in the slag and greater loss of zinc
[0004] Therefore, the use of air as an oxidant for iron removal has become an inevitable choice for iron removal in the field of hydrometallurgy. However, pure air oxidation iron removal results in an unsatisfactory iron removal effect, and it is difficult to reduce the iron content in the solution to 30mg / L Below, but adopt general air oxidation, add catalyst to remove iron, adjust the pH value above 4.5, and the iron content in the solution is below 1g / L, and it will take 5-6h to reduce the iron content below 30mg / L. If the iron content reaches above 5g / L, it will take more than 10 hours to remove iron to a content below 30mg / L, which greatly increases the cost of iron removal and greatly reduces the production efficiency of hydrometallurgy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Pump the zinc sulfate solution containing 5.8g / L iron, Zn114g / L, and a pH value of 2 into the iron removal tank or tank, use stone powder to neutralize the solution until the pH value is 4, and then copper / iron = 0.02 according to the mass ratio Add copper sulfate pentahydrate with a concentration of 0.45g / L, heat up to 60°C, seal the iron removal tank; feed compressed oxygen-enriched air with an oxygen content of 32%, and control the pressure in the iron removal tank or tank to 0.7kg / m2 for neutralization and oxidation iron removal; and after testing the pH in the iron removal tank, when the pH is lower than 4, pump in stone powder to adjust the pH value to 4-4.5, so that the pH value is constant. After 30 minutes of treatment, the iron content in the test is 3.2g / L, continue to be treated for 60 minutes, sampling and testing, its iron content is 0.8g / L, after the treatment time is 1.5h, the iron content is 0.2g / L, when the treatment time reaches 2h, its iron content ...

Embodiment 2

[0028] Add the zinc sulfate solution containing 12.5g / L iron and 135g / L zinc into the iron removal tank or tank, adjust the pH value to 4.5, raise the temperature to 70°C, add copper sulfate according to the mass ratio of copper / iron = 0.05, and seal it The iron removal tank is fed with compressed oxygen-enriched air with an oxygen content of 40%, so that the pressure in the iron removal tank reaches 1.5kg / m2 for neutralization and oxidation iron removal; and after testing the pH in the iron removal tank, wait until the pH is low At 4 o'clock, pump in stone powder to adjust the pH value to 4-4.5, so that the pH value is constant. After 2.5 hours of treatment, take a sample for analysis and measurement. The iron content in the solution is reduced to 15.8 mg / L, and the pressure is released to normal pressure. Press filtration, detection, The zinc content of the slag is 7.8%.

Embodiment 3

[0030] Contain iron 18.5g / L, zinc 121g / L zinc sulfate solution, temperature 70 ℃, according to mass ratio copper / iron=0.1, copper sulfate, pH value is 4.5, oxygen content of compressed oxygen-enriched air is 40%, except Iron tank internal pressure is 2kg / m2, other all operate according to the operation method of embodiment 1, and after it 3h, solution iron is 14.5mg / L, and depressurization is to normal pressure, press filtration, and slag zinc is 9.2%.

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Abstract

The invention relates to the technical field of hydrometallurgy, in particular to an oxidation iron removal method for removing iron from solutions containing iron and zinc by pressurizing oxygen-enriched air. By adopting compressed oxygen-enriched air and copper ion compositions and combining control of technical parameters, the effect of removing iron from zinc sulfate solutions containing iron and zinc is better, the iron removal efficiency is improved, ferric hydroxide colloid formation is effectively avoided, zinc losses are reduced, and the iron removal cost is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for oxidizing and removing iron in a solution containing iron and zinc in pressurized oxygen-enriched air. Background technique [0002] Iron is a harmful impurity in hydrometallurgy and must be removed. The method for removing iron in the prior art is that ferrous ions must be oxidized into ferric ions, then the jarosite method or hematite method, goethite method or Fe(OH) 3 method to remove. In the case of high iron content, most of the hematite (Fe 2 o 3 Crystallization) or jarosite method (K 2 Fe 6 (SO 4 ) 12 Crystallization), this method needs to be carried out under high temperature and highly acidic conditions, and also needs to introduce potassium ions, sodium ions or ammonium ions; and it is still difficult to remove iron ions so that the iron ion concentration reaches below 30mg / L , making it still necessary to use the goethite method or Fe(OH) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/44
CPCC22B3/44C22B19/26Y02P10/20
Inventor 曾光祥李世平张华卢宇杨光王明兴
Owner GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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