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Treatment method for contaminated acid from nonferrous metals smelting

A treatment method and technology for polluted acid, which are applied in the field of non-ferrous smelting pollution control, can solve problems such as hazardous waste residues, and achieve the effect of reducing the addition amount and stabilizing the discharge up to the standard.

Active Publication Date: 2019-11-15
济源豫光有色冶金设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment method of the present invention can effectively solve the technical problem of producing a large amount of hazardous waste residue in the existing sewage acid treatment technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking the sewage acid of a copper smelter as the treatment object, the concentration of each main component is: sulfuric acid 15.3% (mass percentage concentration), copper ion 2133.8mg / L, arsenic ion 13420.5mg / L, cadmium ion 374.2mg / L, Lead ion is 15.9mg / L.

[0032] The detailed steps of the non-ferrous smelting waste acid treatment method using the technical scheme of the present invention are as follows:

[0033] a. First, pump the above-mentioned dirty acid into the membrane filter for filtration (the filter membrane of the membrane filter is 300 meshes). After filtration, the lead sulfate filter residue is obtained. The lead sulfate filter residue is filtered by a plate and frame filter to obtain the content The filter cake of 62.3% lead sulfate (on a dry basis), the lead sulfate filter cake enters the lead smelting system for smelting;

[0034] b. Add 10% by mass sodium sulfide solution to the filtrate obtained after filtration by the membrane filter in step a, and cont...

Embodiment 2

[0039] Taking the sewage acid of a copper smelter as the treatment object, the concentration of each main component is: sulfuric acid 14.1% (mass percentage concentration), copper ion 3765.7mg / L, arsenic ion 15028.6mg / L, cadmium ion 325.1mg / L, Lead ion 18.1mg / L.

[0040] The detailed steps of the non-ferrous smelting waste acid treatment method using the technical scheme of the present invention are as follows:

[0041] a. First, pump the above-mentioned dirty acid into the membrane filter for filtration (the filter membrane of the membrane filter is 350 meshes), and the lead sulfate filter residue is obtained after filtration. The lead sulfate filter residue is filtered by a plate and frame filter to obtain the content The filter cake of 60.8% lead sulfate (on a dry basis), the lead sulfate filter cake enters the lead smelting system for smelting;

[0042] b. Add 10% by mass sodium sulfide solution to the filtrate obtained after filtration by the membrane filter in step a, control ...

Embodiment 3

[0047] Taking the sewage acid of a copper smelter as the treatment object, the concentration of each main component is: sulfuric acid 18.9% (mass percentage concentration), copper ion 4568.4mg / L, arsenic ion 9021.6mg / L, cadmium ion 355.3mg / L, Lead ion is 24.8mg / L.

[0048] The detailed steps of the non-ferrous smelting waste acid treatment method using the technical scheme of the present invention are as follows:

[0049] a. First, pump the above-mentioned dirty acid into the membrane filter for filtration (the filter membrane of the membrane filter is 300 meshes). After filtration, the lead sulfate filter residue is obtained. The lead sulfate filter residue is filtered by a plate and frame filter to obtain the content The filter cake of 66.1% lead sulfate (on a dry basis), the lead sulfate filter cake enters the lead smelting system for smelting;

[0050] b. Add 10% by mass sodium sulfide solution to the filtrate obtained by the membrane filter in step a, and control the ORP value ...

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Abstract

The invention discloses a treatment method for contaminated acid from nonferrous metals smelting. At first, that nonferrous metals smelting waste acid is filtered by a membrane filter to obtain lead sulfate filter residue, and lead sulfate is recovered; a vulcanizing agent is added into the obtained filtrate to sulfurize the copper in the filtrate to form a copper sulfide precipitate, and copper resources are recovered after filtering; the vulcanizing agent is then added to that obtain filtrate to sulfurize heavy metals such as arsenic to form a precipitate for removal; carbide slag is added into that obtained filtrate to adjust the pH value to prepare gypsum, and then the gypsum is dewatered with a centrifuge to obtain dewatered gypsum; finally, the obtained sewage is subjected to advanced treatment, up-to-standard discharge or recycling. The treatment method of the present invention can effectively solve the technical problem of producing large amount of dangerous waste residue in the existing non-ferrous metals smelting contaminated acid treatment technology.

Description

[0001] 1. Technical Field: [0002] The invention belongs to the technical field of non-ferrous smelting pollution treatment, and in particular relates to a method for treating non-ferrous smelting pollution acid. [0003] 2. Background technology: [0004] The dirty acid mainly comes from the power wave flue gas washing of the sulfuric acid workshop. The dirty acid wastewater contains a variety of heavy metal ions, and the concentration of heavy metal ions is high, the form is complex, and the toxicity is high. With the gradual depletion of mineral resources, the lead-zinc smelting industry is facing a situation where there is no stable and single source of minerals, and the components in the polluted acid will be more complicated. The Northwest Lead and Zinc Smelter has been treating Baijia Mine, and its sewage acid has the characteristics of high acid, high Hg, high COD, and high F. The original sulfide-lime neutralization treatment method is difficult to achieve stable Hg, COD, a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G21/20C01G3/12C01F11/46C04B11/02C02F103/16C02F101/20
CPCC02F9/00C01G21/20C01G3/12C01F11/46C04B11/02C02F2103/16C02F2101/20C02F1/001C02F1/5236C02F1/38C02F2301/08C02F2001/007
Inventor 王海波崔鹏夏胜文狄聚才王拥军
Owner 济源豫光有色冶金设计研究院有限公司
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