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Method for treating waste hydrochloric acid containing lead, zinc and ferrum

A treatment method and technology for waste hydrochloric acid, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. To avoid heavy metal pollution, the process is simple and practical, and the effect of removing lead is good.

Inactive Publication Date: 2012-07-18
陆伯新 +4
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  • Description
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Problems solved by technology

[0002] The waste hydrochloric acid produced by enterprises using the pickling and phosphating process in the steel wire rope industry has a large amount of waste hydrochloric acid, which is rich in heavy metals such as lead, zinc, and iron. The problem of its disposal has not been properly resolved, which has caused regional environmental pollution and restricted the development of the industry to a certain extent.
The traditional disposal method is generally to use lime, calcium carbide slag or lime digestion reaction product Ca(OH) 2 With neutralization, the pH value after neutralization can meet the requirements, but the rest of the indicators are difficult to meet the standards
For example, the main pollutants of waste acid, lead and zinc, are amphoteric metals, and the hydroxide precipitation range is narrow, and they will be dissolved again when the pH is low or high, and because the pH value of the waste acid is extremely low, neutralization will consume a large amount of lime and produce A large amount of sludge, causing pollution transfer, difficult post-processing

Method used

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  • Method for treating waste hydrochloric acid containing lead, zinc and ferrum

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Embodiment Construction

[0015] The treatment method of waste hydrochloric acid containing lead, zinc and iron described in this example takes the treatment of waste hydrochloric acid in the steel wire rope industry as an example, as figure 1 As shown, through the following process flow:

[0016] (1) After starting the tail gas absorption system (10% NaOH solution), add a certain amount of calcium oxide into the waste hydrochloric acid solution for reaction, preferably the pH of the filtrate after the reaction is about 0.5-4.5. The main chemical reactions are:

[0017] CaO+H 2 O→Ca(OH) 2

[0018] Ca(OH) 2 +2HCl→CaCl 2 +2H 2 o

[0019] CaCO 3 +2HCl→CaCl 2 +H 2 O+CO 2 ↑

[0020] (2) The filtrate is pumped into the reactor and left for the next reaction, and the filter residue (the filter residue is a small amount of lead, zinc, iron hydroxide precipitates and calcium oxide impurities) is used for the next batch of reactions.

[0021] (3) After opening the reactor and stirring, add the confi...

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Abstract

The invention discloses a method for treating waste hydrochloric acid containing lead, zinc and ferrum. The method comprises the following steps of: adjusting the pH value of the waste hydrochloric acid containing lead, zinc and ferrum to make the pH value of the further filtered filtrate between 0.5 and 4.5; adding the filtrate into sodium sulfide solution, fully stirring and reacting; and filtering; the filtrate is the treated hydrochloric acid, and the main component of the treated hydrochloric acid is ferrous chloride; the filter residue is a mixture of lead sulfide, zinc sulfide and ferrous sulfide. By the method, the separation of lead, zinc and ferrum can be realized effectively.

Description

technical field [0001] The invention relates to a method for treating waste hydrochloric acid containing lead, zinc and iron. Background technique [0002] The waste hydrochloric acid produced by enterprises using the pickling and phosphating process in the steel wire rope industry has a large amount of waste hydrochloric acid, which is rich in heavy metals such as lead, zinc, and iron. The problem of its disposal has not been properly resolved, which has caused regional environmental pollution and restricted the development of the industry to a certain extent. . The traditional disposal method is generally to use lime, calcium carbide slag or lime digestion reaction product Ca(OH) 2 With neutralization, the pH value after neutralization can meet the requirements, but the remaining indicators are difficult to meet the standards. For example, the main pollutants of waste acid, lead and zinc, are amphoteric metals, and the hydroxide precipitation range is narrow, and they wi...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 陆伯新陆荣葛勇德吴玉军严宇澄
Owner 陆伯新
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