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Method for preparing zinc sulphate monohydrate from zinc-containing waste residues

A technology of zinc sulfate and waste sulfuric acid, applied in the preparation of zinc sulfate and zinc compounds, chemical instruments and methods, etc., can solve problems such as difficulty in recycling, and achieve the effect of saving cost and energy

Active Publication Date: 2017-11-24
台山市化工厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming and deficiency in the prior art, provide the method for preparing zinc sulfate monohydrate from zinc-containing waste slag, make the preparation raw material cost of zinc sulfate monohydrate low, waste reuse, solve existing zinc-containing The environmental problem that the waste residue is difficult to recycle, and the preparation process is also energy-saving and environmentally friendly, no waste gas and waste water are generated, less reagents are used, and no reagents that are unfavorable to the environment are used. Metals such as copper and cadmium are recovered while zinc sulfate monohydrate is prepared, and each Secondary waste slag can be reused to achieve comprehensive utilization of zinc-containing waste slag

Method used

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  • Method for preparing zinc sulphate monohydrate from zinc-containing waste residues
  • Method for preparing zinc sulphate monohydrate from zinc-containing waste residues
  • Method for preparing zinc sulphate monohydrate from zinc-containing waste residues

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Embodiment 1

[0028] The production raw material contains zinc waste residue, calculated by weight percentage, containing 40-60% of zinc, 2-4% of iron, 3-5% of copper, 10-20% of cadmium and 8-16% of silicon oxide.

[0029] The present embodiment prepares the method for zinc sulfate monohydrate from zinc-containing waste residue, and its preparation method is as follows:

[0030] (1) Acid leaching: add zinc-containing waste residue and sulfuric acid with a weight percentage of 20-30% to the first acid leaching tank in a weight ratio of 1:3, and continue to stir for 2 hours. At the end of the reaction, control the pH to 4.8-5.0, press filter Perform liquid-solid separation to obtain primary filtrate and primary filter residue;

[0031] (2) Oxidative iron removal: put the primary filtrate in the iron removal tank, heat it to 70°C, introduce air or oxygen and stir, the color of the filtrate changes from colorless to rust red, and detect the concentration of ferric ion. 3+ When the content is l...

Embodiment 2

[0038] The production raw material contains zinc waste residue, calculated by weight percentage, containing 40-60% of zinc, 2-4% of iron, 3-5% of copper, 10-20% of cadmium and 8-16% of silicon oxide.

[0039] The method for preparing zinc sulfate monohydrate from zinc-containing waste residue, its preparation method is as follows:

[0040](1) Acid leaching: Add zinc-containing waste slag and factory waste sulfuric acid with a weight percentage of 20 to 30% to the first acid leaching tank in a weight ratio of 1:3, and continue stirring for 2 hours. At the end of the reaction, the pH is controlled to be 4.8 to 5.0, Press filtration for liquid-solid separation to obtain the primary filtrate and primary filter residue; then in the second acid leaching step, the primary filter residue and 20-30% of factory waste sulfuric acid are added to the second acid leaching tank in a weight ratio of 1:4, and heated to The temperature is 30-40°C, continuous stirring for 2.5-3 hours, the pH is ...

Embodiment 3

[0052] The production raw material contains zinc waste residue, calculated by weight percentage, containing 40-60% of zinc, 2-4% of iron, 3-5% of copper, 10-20% of cadmium and 8-16% of silicon oxide.

[0053] The present embodiment prepares the method for zinc sulfate monohydrate from zinc-containing waste residue, and its preparation method is as follows:

[0054] (1) Acid leaching: add zinc-containing waste residue and sulfuric acid with a weight percentage of 20-30% to the first acid leaching tank in a weight ratio of 1:3, and continue to stir for 2 hours. At the end of the reaction, control the pH to 4.8-5.0, press filter Perform liquid-solid separation to obtain primary filtrate and primary filter residue;

[0055] (2) Oxidative iron removal: put the primary filtrate in the iron removal tank, heat to 75°C, feed air or oxygen and stir at a stirring speed of 800r / min, and the gas flow rate of the air or oxygen is 6-8L / min , the color of the filtrate changed from colorless ...

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Abstract

The invention discloses a method for preparing zinc sulphate monohydrate from zinc-containing waste residues. The method is characterized by comprising the following steps of (1), acid leaching; (2), oxidation for iron removal; (3), extraction of copper; (4), replacement for cadmium removal; (5), concentration and crystallization. The method for preparing the zinc sulphate monohydrate from the zinc-containing waste residues is a low-carbon and environmentally-friendly scheme, the preparation raw material is low in cost, waste is reutilized, the environmental problem that existing zinc-containing waste residues cannot be recycled and utilized is solved, the preparation process is energy-saving and environmentally-friendly, no waste gas or waste water is generated, a reagent unfriendly to the environment is not used, meanwhile metal, such as the copper and cadmium, is recycled, and the waste residues are reutilized.

Description

technical field [0001] The invention relates to the field of preparation of zinc sulfate monohydrate, in particular to a method for preparing zinc sulfate monohydrate from zinc-containing waste residue. Background technique [0002] Zinc sulfate is an important industrial raw material, widely used in feed additives, fertilizers, chemicals, pharmaceuticals, national defense, rubber, electronics, electroplating, water treatment and other industries, and is a raw material for the manufacture of zinc salts and lithopone. In the electrolysis industry, it is used for cable galvanizing and electrolytic pure zinc. It is also used to prevent diseases in fruit tree nurseries, wood and leather preservatives and artificial fiber industries. It is also used as a nutritional supplement (zinc enhancer) in food grade. The commonly used method in industry is to react with sulfuric acid and zinc oxide, or to react with zinc powder or zinc ingot directly with sulfuric acid, then filter, then a...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01G9/06C01G9/00C22B15/00C22B17/00
CPCC01G9/003C01G9/06C01P2006/80C22B7/007C22B15/0084C22B17/04Y02P10/20
Inventor 叶宏裕杨庆辉黄志远肖国寅马景荣
Owner 台山市化工厂有限公司
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