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Method for reducing content of impurities in zinc hydrometallurgy iron oxide slag

A technology of iron oxide slag and impurity content, applied in the direction of improving process efficiency, etc., can solve the problems of unsatisfactory impurity content and high impurity content of iron oxide slag, overcome the limitation of zinc ion concentration, reduce zinc content, and The effect of low consumption

Inactive Publication Date: 2017-06-20
HENAN YUGUANG ZINC IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high impurity content in iron oxide slag produced by the wet smelting zinc hematite method in the prior art and the unsatisfactory reduction of the impurity content in the existing iron oxide slag, and to provide a method for reducing The method of impurity content in zinc oxide iron slag uses the principle that the solubility of zinc sulfate decreases with the increase of temperature when the solubility of zinc sulfate is above 60 ° C. In the process of oxidation hydrolysis iron removal, low temperature conditions are used to obtain mixed iron slag, which reduces the iron removal process. The crystallization of zinc in the medium reduces the zinc content in the iron slag accordingly, and overcomes the limitation of the existing iron removal method on the concentration of zinc ions in the iron-containing zinc sulfate solution; the mixed iron slag is adjusted with neutral or acid-containing production wastewater After the slurry is continuously and quantitatively added to the autoclave, the iron vitriol, basic ferric sulfate, and goethite will react and be converted into iron oxide at high temperature, and the soluble sulfate produced by the reaction and the soluble sulfate in the original mixed iron slag will be dissolved in water , to obtain iron oxide slag with low impurity content, correspondingly improve the grade of iron oxide slag, and at the same time, the production wastewater can be recycled

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  • Method for reducing content of impurities in zinc hydrometallurgy iron oxide slag
  • Method for reducing content of impurities in zinc hydrometallurgy iron oxide slag

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Embodiment 1

[0022] Embodiment 1: a kind of method that reduces impurity content in the zinc oxide slag of hydrometallurgy, comprises the steps:

[0023] Step 1), neutralize the zinc sulfate solution containing 15g / L of ferrous iron and 180g / L of zinc, and then put it into the iron removal autoclave for low-temperature oxidation and hydrolysis to remove iron. The reaction temperature is 120°C, the oxygen partial pressure is 0.1MPa, and the time is After 1 hour, a mixture of iron oxide and goethite is formed. The mixture contains a small amount of impurities such as basic ferric sulfate, iron vitriol, and a small amount of soluble sulfate. The mixture is cooled and filtered to obtain mixed iron slag and iron-free zinc sulfate. solution;

[0024] Step 2), add the mixed iron slag and water obtained in step 1) into the slurry tank to make a slurry with a mass ratio of 5%, and heat it to 85°C with steam. The water used can be neutral or acid-containing production wastewater. In this In the emb...

Embodiment 2

[0029] Embodiment 2: A kind of method for reducing impurity content in the zinc oxide slag of hydrometallurgy, comprises the following steps;

[0030] Step 1), neutralize the zinc sulfate solution containing 20g / L of ferrous iron and 140g / L of zinc, and then put it into the iron removal autoclave for low-temperature oxidation and hydrolysis to remove iron. The reaction temperature is 150°C, the oxygen partial pressure is 0.2MPa, and the time is 3h, forming a mixture of iron oxide and goethite, the mixture contains a small amount of impurities such as basic ferric sulfate, iron vitriol and a small amount of soluble sulfate entrained, the mixture is cooled and filtered to obtain mixed iron slag and iron-free zinc sulfate solution;

[0031] Step 2), add the mixed iron slag obtained in step 1) and the electrolytic zinc scalding tank water in the process of wet zinc smelting to the slurry mixing tank to make a slurry with a mass ratio of 10%, and heat it to 90°C with steam; Neutra...

Embodiment 3

[0034] Embodiment 3 A kind of method for reducing impurity content in the zinc oxide slag of hydrometallurgy, comprises the following steps;

[0035] Step 1), neutralize the zinc sulfate solution containing 30g / L of ferrous iron and 160g / L of zinc, and then put it into the iron removal autoclave for low-temperature oxidation and hydrolysis to remove iron. The reaction temperature is 140°C, the oxygen partial pressure is 0.3MPa, and the time is After 1.5 hours, a mixture of iron oxide and goethite is formed. The mixture contains a small amount of impurities such as basic ferric sulfate, iron vitriol, and a small amount of soluble sulfate entrained. The mixture is cooled and filtered to obtain mixed iron slag and iron-free sulfuric acid. Zinc solution;

[0036] Step 2), add the mixed iron slag obtained in step 1) and the lead and silver slag washing water in the process of wet zinc smelting to the slurry tank to make a slurry with a mass ratio of 20%, and heat it to 95°C with st...

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Abstract

The invention relates to a method for reducing content of impurities in zinc hydrometallurgy iron oxide slag. The principle that the solubility of zinc sulfate decreases with increase of the temperature above 60 DEG C is used, mixed iron slag is obtained under the low-temperature condition in the process of iron removal through oxidation hydrolysis, zinc crystals in the process of iron removal are reduced, the content of zinc in the iron slag is correspondingly reduced, and the limitation on the concentration of zinc ions in the iron-containing zinc sulfate solution in an existing iron removal method is broken through; the mixed iron slag and neutral or acidic production wastewater are subjected to size mixing and then are continuously and quantitatively added to a high-pressure kettle, iron vitriol, basic iron sulfate and goethite react to be converted into iron oxide at the high temperature, soluble sulfate produced through the reaction and soluble sulfate in the original mixed iron slag are dissolved in water, iron oxide slag with the low impurity content is obtained, the grade of the iron oxide slag is correspondingly increased, and meanwhile, the production wastewater is recycled.

Description

technical field [0001] The invention belongs to the technical field of impurity removal in zinc hydro-smelting, and in particular relates to a method for reducing the content of impurities in iron oxide slag in zinc hydro-smelting by combining high and low temperature. Background technique [0002] The hematite method is the main method for removing iron from the iron-containing zinc sulfate solution of zinc hydrosmelting. Jarosite (jaojasite, jarosite, hydrated jarosite, etc.) will be formed during the precipitation of hematite , basic iron sulfate, goethite and other impurities, and because the solubility of zinc sulfate is above 60°C and the solubility decreases with the increase of temperature, under the reaction conditions of the existing iron removal method (temperature is about 180°C) zinc sulfate If the solubility is lower than 110g / L, a large amount of zinc sulfate crystals are mixed into iron slag, resulting in high content of Zn, K, Na, and S in the produced iron ...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B3/22C22B19/20
CPCC22B3/22C22B3/44C22B19/26Y02P10/20
Inventor 张向阳倪恒发张新庄杨腾蛟张文科孔金换张阳
Owner HENAN YUGUANG ZINC IND
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