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Method for deep oxidation and harmless treatment of zinc sulfite slag for comprehensive recovery of valuable metal

A zinc sulfite, deep oxidation technology, applied in the direction of improving process efficiency, can solve the problems of lowering grade, high energy consumption, difficult to control uniformity, etc., to reduce production safety and environmental protection pressure, reduce safety and environmental protection pressure, reduce The effect of production costs

Pending Publication Date: 2020-06-05
YUNNAN LUOPING ZINC & ELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the treatment of zinc sulfite, there are mainly the following methods at present: 1. Zinc sulfite is concentratedly analyzed with dilute sulfuric acid to generate high-concentration sulfur dioxide gas and zinc sulfate slurry solution for acid production, but part of the sulfur dioxide overflows from the analysis tank in this method , deteriorating the operating environment, and more importantly, in the analysis process, due to the difficulty in controlling the uniformity of the input of zinc sulfite and the addition of dilute sulfuric acid, the concentration of the generated sulfur dioxide gas fluctuates greatly, and the production of the acid system is difficult to control, so that the tail gas discharge meets the standard Difficulties and increased environmental risks
2. After the zinc oxide powder produced by the rotary kiln is slurried, it is contacted with the flue gas of low concentration sulfur dioxide in the spray tower, and zinc sulfite is formed after absorbing sulfur dioxide, and then air is passed into it for oxidation. The disadvantage of this method is that zinc sulfite is not oxidized Completely, the oxidation rate is not high, only about 80wt%, and a large amount of sulfur dioxide gas will be released during acid leaching in the next process, which will deteriorate the operating environment and cause great risk and pressure to production
3. Chinese patent CN109161691A discloses a method for comprehensive recovery and treatment of zinc sulfite slag, which adopts the boiling roasting method, that is, after the zinc sulfite slag is dried and crushed, it is mixed with high-sulfur zinc concentrate and boiled and roasted to recover zinc. The disadvantages of this method are: (1) It must be mixed with high-sulfur zinc concentrate to be boiled and roasted; (2) Mixed with zinc concentrate to reduce the grade of lead, germanium, and silver, and to deplete the valuable metal intermediate product zinc sulfite slag
(3) Drying is required, which consumes a lot of energy, and zinc sulfite will decompose and release sulfur dioxide during the baking process, which will deteriorate the operating environment and bring pressure to environmental protection

Method used

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  • Method for deep oxidation and harmless treatment of zinc sulfite slag for comprehensive recovery of valuable metal
  • Method for deep oxidation and harmless treatment of zinc sulfite slag for comprehensive recovery of valuable metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get 15,000 grams of zinc sulfite slag produced by our company and dry it for use. The zinc sulfite slag contains 24.63wt% of zinc, 22.79wt% of zinc sulfite, 2.17wt% of iron, 0.0299wt% of germanium, 1.95wt% of lead, and 0.0056% of silver. wt%, moisture 9.5wt%.

[0040] 1) Slurrying of zinc sulfite slag: take 60 liters of industrial water, add 10,000 grams of zinc sulfite slag for slurrying, the slurrying time is 10 minutes, stir and slurry evenly before use.

[0041] 2) Oxidation of pulped pulp by air: the pulp after stirring and pulping is fed with compressed air in reverse, and the acidity is adjusted with 150g / l-200g / l sulfuric acid or acid-containing filtrate during the process, and the process pH is kept at 3.5-4.0 at room temperature Stirring, air oxidation for 2.0-2.5 hours. Obtain air oxidation liquid.

[0042] 3) Deep oxidation of oxidizing agent: After air oxidation, add 200 grams of hydrogen peroxide and 50 grams of potassium permanganate to the middle liqui...

Embodiment 2

[0052] Get 15,000 grams of zinc sulfite slag produced by our company and dry it for use by calculation. Silver 0.0026wt%, moisture 8.8wt%.

[0053] 1) Slurrying of zinc sulfite slag: take 65 liters of industrial water, add 10,000 grams of zinc sulfite slag for slurrying, the slurrying time is 10 minutes, stir and slurry evenly before use.

[0054] 2) Oxidation of pulped pulp by air: the pulp after stirring and pulping is fed with compressed air in reverse, and the acidity is adjusted with 150g / l-200g / l sulfuric acid or acid-containing filtrate during the process, and the process pH is kept at 3.5-4.0 at room temperature Stirring, air oxidation for 2.0-2.5 hours. Obtain air oxidation liquid.

[0055] 3) Deep oxidation of oxidant: add 300 grams of hydrogen peroxide and 70 grams of potassium permanganate to the liquid after air oxidation, adjust the acidity with 150 grams per liter of sulfuric acid or acid-containing filtrate, keep the process pH = 2.0-3.0, and then carry out d...

Embodiment 3

[0065] Get 15,000 grams of zinc sulfite slag produced by our company and dry it for later use. The zinc sulfite slag contains 32.56wt% of zinc, 29.89wt% of zinc sulfite, 4.35wt% of iron, 0.0338wt% of germanium, 3.35wt% of lead, and 0.0047wt% of silver. wt%, moisture 8.5wt%.

[0066] 1) Slurrying of zinc sulfite slag: take 70 liters of industrial water, add 10,000 grams of zinc sulfite slag for slurrying, the slurrying time is 10 minutes, stir and slurry evenly before use.

[0067] 2) Oxidation of pulped pulp by air: the pulp after stirring and pulping is fed with compressed air in reverse, and the acidity is adjusted with 150g / l-200g / l sulfuric acid or acid-containing filtrate during the process, and the process pH is kept at 3.5-4.0 at room temperature Stirring, air oxidation for 2.0-2.5 hours. Obtain air oxidation liquid.

[0068] 3) Deep oxidation of oxidant: add 400 grams of hydrogen peroxide and 100 grams of potassium permanganate to the liquid after air oxidation, adju...

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Abstract

The invention discloses a method for deep oxidation and harmless comprehensive recovery processing of zinc sulfite slag. The method comprises the following steps: zinc oxide powder produced by a zincvolatilizezing kiln is directly pulpified to absorb low-concentration sulfur dioxide flue gas generated by the zinc volatilizezing kiln to obtain zinc sulfite slag as the raw material, the zinc sulfite slag is first pulpified and then subjected to air oxidation, then, a mixing oxidizing agent is added for deep oxidation, heating and warming are carried out, finally filtering is carried out to obtain germanium-containing zinc sulfate solution and zinc oxide slag, germanium-containing zinc sulfate solution and zinc oxide slag are the raw materials of zinc hydrometallurgy, wherein zinc sulfate solution contains high content of germanium and low contents of zinc and ferric iron, germanium can be directly recycled to obtain high-grade germanium concentrate, acid leaching is carried out on zincoxide slag to recycle zinc and produce lead and silver concentrate to recycle lead and silver.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for deep oxidation of zinc sulfite slag and harmless comprehensive recovery of valuable metals. Background technique [0002] To protect the clear water and blue sky and build a green home together, the zinc hydrometallurgy industry uses self-produced zinc oxide powder and dust to absorb low-concentration sulfur dioxide flue gas to meet the emission standards, and at the same time obtain zinc sulfite slag, the main component of which is zinc sulfite. For the treatment of zinc sulfite, there are mainly the following methods at present: 1. Zinc sulfite is concentratedly analyzed with dilute sulfuric acid to generate high-concentration sulfur dioxide gas and zinc sulfate slurry solution for acid production, but part of the sulfur dioxide overflows from the analysis tank in this method , deteriorating the operating environment, and more importantly,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B41/00C22B19/20C22B19/30C22B13/00C22B11/00
CPCC22B7/006C22B11/042C22B13/045C22B19/20C22B19/30C22B41/00Y02P10/20
Inventor 陈长浩吴慧李尤立张龙赵兵伍杨智赵菊华李金波幸文仲
Owner YUNNAN LUOPING ZINC & ELECTRICITY
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