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Method for treating high-arsenic contaminated acid

A treatment method and technology of high arsenic polluted acid, applied in water/sewage treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., to achieve the effect of no harmful gas, safe and efficient treatment process

Active Publication Date: 2017-10-20
中城华宇(北京)矿业技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is no effective treatment process at present, so that the waste liquid and waste residue obtained after the treatment of high-arsenic polluted acid can meet the safe discharge standard at the same time

Method used

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Experimental program
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Effect test

Embodiment 1

[0025] This embodiment provides a treatment method for high arsenic acid, which is taken from a sulfuric acid plant. The water quality analysis result is shown in Table 1. The specific treatment method includes the following steps:

[0026] First, add lime milk to the high arsenic dirty acid to a pH of about 5.0, then blow air into the high arsenic dirty acid and add iron sulfate at the same time. The air-water ratio is about 10:1. The amount of iron sulfate added is The theoretical addition amount (that is, the theoretical calculation amount of all the trivalent arsenic in the high arsenic acid polluting acid to produce iron arsenate, the same below), after about 1 hour of reaction, no precipitation is observed, and then the flocculant PAM is added to achieve high arsenic In the dirty acid meter, the amount of flocculant added is about 4 mg / L, and the first sediment and the intermediate liquid product are separated to obtain the first sediment. The composition analysis result of ...

Embodiment 2

[0041] This embodiment provides a method for processing high arsenic polluting acid, which is taken from a sulfuric acid plant. The water quality analysis results are shown in Table 3. The specific processing method includes the following steps:

[0042] Add lime milk to the high arsenic dirty acid to a pH of about 1.5, until no calcium sulfate precipitation is observed, then add the flocculant PAM, based on the high arsenic dirty acid, the amount of flocculant added is about 4mg / L, and finally The calcium sulfate obtained is precipitated and separated and used as industrial gypsum after further treatment.

[0043] To the above-mentioned high arsenic acid with some sulfate radicals removed, continue to add milk of lime to a pH of about 4.5, then blow in air and add iron sulfate at the same time. The air-water ratio is about 10:1, and the amount of iron sulfate added is 1.1 times the theoretical amount added. After reacting for about 1h, no precipitation is observed. Then add the fl...

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Abstract

The invention provides a method for treating high-arsenic contaminated acid. The method comprises the following steps: 1) adding a calcium compound into high-arsenic contaminated acid until the pH value is 3 to 6, adding an oxidizing agent and soluble iron salt to perform reaction until precipitate is not generated any more, and performing solid and liquid separation to obtain a first precipitate and an intermediate liquid product; 2) adding the calcium compound into the intermediate liquid product to perform reaction, controlling the pH value to be 7 to 9 until precipitate is not generated any more, and performing solid and liquid separation to obtain a second precipitate and waste liquid, wherein the calcium compound is selected from at least one of calcium hydroxide and calcium oxide. By the treatment method, the waste liquid and the waste residues reach the discharge standard at the same time.

Description

Technical field [0001] The invention relates to a method for processing high arsenic acid and belongs to the field of environmental science and technology. Background technique [0002] In the process of pyrite smelting and flue gas sulphuric acid production, a large amount of waste liquid will be produced. These waste liquids contain a large amount of sulfuric acid, as well as toxic and harmful ions such as arsenic, copper, lead, and zinc, especially the content of trivalent arsenic ions It can even exceed 200mg / L. At the same time, the above-mentioned waste liquid also contains a large amount of reducing substances, and its chemical oxygen demand (COD) is usually higher than 500 mg / L. The waste liquid produced by pyrite smelting and flue gas sulphuric acid production with an arsenic ion content of more than 200mg / L and a COD value of more than 500mg / L is usually called high arsenic acid. If these high arsenic pollution acids are directly discharged, they will cause serious en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/5236C02F1/72C02F2101/103
Inventor 袁欣波谢祖宁程涛
Owner 中城华宇(北京)矿业技术有限公司
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