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Iron depositing method of high acid and high iron solution goethite during zinc hydrometallurgy

A technology for hydrometallurgy of zinc and goethite, applied in the direction of improvement of process efficiency, etc., can solve the problems of high zinc content, impact on iron resource utilization, low iron grade, etc., and achieve improved leaching rate, simple operation, and high iron slag grade high effect

Inactive Publication Date: 2011-04-13
ZHUZHOU SMELTER GRP
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Zinc concentrate is leached directly with high acid and high temperature plus oxygen, and the obtained zinc sulfate solution contains high iron and sulfuric acid content, and iron is mainly composed of Fe 3+ It exists in the form of iron-precipitation before the electro-zinc process, but the conventional iron-precipitation method is used to remove iron. The zinc content in the iron-precipitation slag is high, and the grade of iron is low, which affects the resource utilization of iron.

Method used

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  • Iron depositing method of high acid and high iron solution goethite during zinc hydrometallurgy
  • Iron depositing method of high acid and high iron solution goethite during zinc hydrometallurgy

Examples

Experimental program
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Effect test

Embodiment 1

[0040]a) Use zinc concentrate to treat high-acid and high-Fe 3+ The leaching solution is restored.

[0041] High Acid High Fe 3+ The chemical composition of the leachate is: Zn 2+ 138g / L, H 2 SO 4 22g / L, Cu 2+ 1.1g / L, Fe 3+ 10g / L, Fe 2+ 6g / L.

[0042] The weight percentage content of the zinc concentrate adopted is: Zn41%, S32%, Fe8%.

[0043] During reduction, the temperature is 80°C and the time is 4h.

[0044] The chemical composition of the solution after the reduction obtained is: Zn 2+ 145g / L, H 2 SO 4 22g / L, Cu 2+ 1.1g / L, Fe 3+ 0.7g / L, Fe 2+ 14.7g / L.

[0045] b) pre-neutralizing the leaching solution to a pH value of 1.5-2.5.

[0046] The neutral leaching slag produced by conventional zinc hydrometallurgy is added to pre-neutralize the leaching solution. The pre-neutralization time is 3 hours and the temperature is 80°C.

[0047] The weight percentage content of the neutral leaching slag is: Zn24%, Fe20%, Cu0.7%, S7%.

[0048] The chemical composition ...

Embodiment 2

[0055] a) Use zinc concentrate to treat high-acid and high-Fe 3+ The leaching solution is restored.

[0056] High Acid High Fe 3+ The chemical composition of the leachate is: Zn 2+ 132g / L, H 2 SO 4 25g / L, Cu 2+ 1.3g / L, Fe 3+ 13g / L, Fe 2+ 3g / L.

[0057] The weight percentage content of the zinc concentrate adopted is: Zn41%, S32%, Fe8%.

[0058] During reduction, the temperature is 100°C and the time is 3h.

[0059] The chemical composition of the solution after the reduction obtained is: Zn 2+ 138g / L, H 2 SO 4 25g / L, Cu 2+ 1.3g / L, Fe 3+ 0.9g / L, Fe 2+ 14.3g / L.

[0060] b) pre-neutralizing the leaching solution to a pH value of 1.5-2.5.

[0061] The neutral leaching slag produced by conventional zinc hydrometallurgy is added to pre-neutralize the leaching solution. The pre-neutralization time is 3 hours and the temperature is 70°C.

[0062] The weight percentage content of the neutral leaching slag is: Zn22%, Fe20%, Cu1.3%, S6.7%.

[0063] The chemical composit...

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Abstract

The present invention provides an iron depositing method of high acid and high iron solution goethite during zinc hydrometallurgy, comprising the following steps: a) carrying through oxidization leaching for zinc concentrate ore by using a sulphuric acid contained solution; b) reducing the leaching liquid by the zinc concentrated ore; c) pre-neutralizing the reduced liquid until pH value is 1.5-2.5, and generating a supernatant and a base flow via solid and liquid separation; d) carrying through goethite iron depositing for the generated supernatant, wherein after iron is deposited, liquid and solid are separated; the overflow is returned into a purification process; a part of the base flow is returned to a first iron depositing reactor as a seed crystal, and the rest base flow is discharged outwardly. The method provided by the present invention, iron is deposited in a form of goethite by using a high acid and high iron solution generated during zinc refining procedure; the grade of iron slag is high; and emissions of waste residues, waste gas and waste water are not increased.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a method for precipitating iron from goethite in a high-acid and high-iron solution in a zinc hydrometallurgy process. Background technique [0002] Since the 1970s, zinc hydrometallurgy technology has developed rapidly. Compared with zinc pyrometallurgy, zinc hydrometallurgy has the advantages of good working conditions, environmental protection, easy continuous production, automation, large-scale, and convenient comprehensive recycling. Used in new smelters. [0003] In the traditional zinc hydrometallurgy process, zinc concentrate needs to be boiled and roasted to obtain zinc calcine and sulfur dioxide flue gas. Although the flue gas after dust collection is used for acid production, the tail gas after acid production still contains a certain amount of sulfur dioxide. , causing air pollution. With the continuous development of zinc hydrometallurgy technology, the direct leachin...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/46C22B19/00
CPCY02P10/20
Inventor 陈爱国张权度王志美周正华袁建明孙天友苗华磊王强
Owner ZHUZHOU SMELTER GRP
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