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A method for adding metal powder and inorganic salt to remove arsenic and chlorine in polluted acid

A technology of metal powder and metal addition, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problem of large acid consumption and water consumption, high cost of gypsum slag treatment, and difficult reprocessing of polluted acid. and other problems, to achieve the effect of reducing the amount of slag, improving economic and environmental benefits, and shortening the processing time.

Active Publication Date: 2022-01-04
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that when the chlorine content is high, there is a large amount of copper slag and a large amount of copper slag is introduced into the sewage acid, which makes it difficult to reprocess the sewage acid.
[0007] The existing sewage acid treatment process has the following problems: high direct cost of treatment, serious waste of resources, complicated process operation; high cost of gypsum slag treatment; large acid and water consumption of the enterprise itself; low chlorine removal efficiency and complicated process Wait

Method used

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  • A method for adding metal powder and inorganic salt to remove arsenic and chlorine in polluted acid
  • A method for adding metal powder and inorganic salt to remove arsenic and chlorine in polluted acid
  • A method for adding metal powder and inorganic salt to remove arsenic and chlorine in polluted acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] Take 100mL of dirty acid solution and put it into the reaction kettle, start stirring (100 rpm), and preheat to 35°C, the dirty acid contains As (as H 3 AsO 3 form) 735mg / L, Cl (as Cl - form) 1300mg / L, Pb (as Pb 2+ form) 116mg / L, Cd (as Cd 2+ form) 101.7mg / L, F (in the form of F - form) 456mg / L, pH=1.2;

[0178] Add 0.255g zinc powder, 8.6mL of copper sulfate solution of 50g / L in polluted acid simultaneously, continue to stir (100 revs / min) reaction, the reaction time is 10 minutes, obtains solid-liquid mixture I; Above-mentioned solid-liquid mixture I is extracted Filter, obtain filtrate I and filter residue I, measure the content of arsenic in filtrate I, contain As (with H 3 AsO 3 form) 43.96mg / L, in the above reaction process, the removal rate of arsenic is 94.0%;

[0179] Take the filtrate I and place it in the reactor, start stirring (100 rpm), and heat to 35°C, add copper powder and copper sulfate solution, 0.094g copper powder, 3.9mL of 50g / L copper sulfa...

Embodiment 2

[0181] Take 100mL of dirty acid solution and put it into the reaction kettle, start stirring (100 rpm), and preheat to 35°C, the dirty acid contains As (as H 3 AsO 3 form) 790mg / L, Cl (as Cl - form) 1025mg / L, Pb (as Pb 2+ form) 198mg / L, Cd (as Cd 2+ form) 98mg / L, F (in the form of F - form) 502mg / L, pH=1.0;

[0182] Add 0.273g zinc powder, 9.1mL of copper sulfate solution of 50g / L in polluted acid simultaneously, continue to stir (100 revs / min) reaction, the reaction time is 10 minutes, obtains solid-liquid mixture I; Above-mentioned solid-liquid mixture I is pumped Filter, obtain filtrate I and filter residue I, measure the content of arsenic in filtrate I, contain As (with H 3 AsO 3 form) 48.98mg / L; in the above-mentioned reaction process, the removal rate of arsenic is 93.8%;

[0183] Get the filtrate I and place it in the reactor, start stirring (100 rev / min), and heat to 35°C, add copper powder and copper sulfate simultaneously, 0.616g copper powder, 12.3mL of copp...

Embodiment 3

[0185] Take 100mL of dirty acid solution and put it into the reaction kettle, start stirring (100 rpm), and preheat to 35°C, the dirty acid contains As (as H 3 AsO 3 form) 483mg / L, Cl (as Cl - form) 1103mg / L, Pb (as Pb 2+ form) 156mg / L, Cd (as Cd 2+ form) 86.5mg / L, F (in the form of F - form) 598mg / L, pH=1.5;

[0186] Add 0.167g zinc powder, 5.6mL of copper sulfate solution of 50g / L in polluted acid simultaneously, continue stirring (100 revs / min) reaction, the reaction time is 10 minutes, obtains solid-liquid mixture I; Above-mentioned solid-liquid mixture I is pumped Filter, obtain filtrate I and filter residue I, measure the content of arsenic in filtrate I, contain As (with H 3 AsO 3 form) 28.49mg / L; in the above-mentioned reaction process, the removal rate of arsenic is 94.1%;

[0187] Get the filtrate I and place it in the reactor, start stirring (100 rev / min), and heat to 35°C, add copper powder and copper sulfate simultaneously, 0.706g copper powder, 29.4mL of c...

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Abstract

The invention relates to a method for removing arsenic and chlorine by adding metal powder and inorganic salts to polluted acid to remove arsenic and chlorine in the polluted acid. The steps include: adding a certain amount of metal powder and copper sulfate solution to the polluted acid at the same time, React for a set time, generate a precipitate, and perform solid-liquid separation to obtain a filtered solution and precipitated impurities. According to the method for removing arsenic and chlorine provided by the present invention, the generation of lime slag is effectively reduced, and the arsenic and chlorine impurity ions in the polluted acid are effectively removed, and the treated acid and water can be recycled to the zinc leaching section At the same time, the pollution to the environment is reduced; and the reaction time is short, and the efficiency of arsenic and chlorine removal is high; economic and environmental benefits are realized comprehensively.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for removing arsenic and chlorine by adding metal powder and sulfate to polluted acid. Background technique [0002] During the smelting process of non-ferrous metals, a large amount of flue gas containing sulfur dioxide is produced. Recycling sulfur dioxide to make acid not only eliminates smoke hazards, but also creates value. However, at present, the polluted acid solution formed by the recovery of roasting flue gas in enterprises often contains impurities such as arsenic, chlorine, and fluorine, which are extremely harmful to the subsequent electrowinning process. Excessive content will reduce the efficiency of electrolytic current and affect product quality. Therefore, it is necessary to remove impurities through the solution to remove the above impurities and produce a solution that can be reused. [0003] For the removal of arsenic impurities, at present, lead and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/10C02F101/12
CPCC02F9/00C02F2101/12C02F1/001C02F1/02C02F2001/007C02F2209/06C02F1/705
Inventor 李静张利波罗永光邹景田席云浩曲洪涛俞兵谢庭芳王仕兴林国保佳懿顾利坤付光李红权皮忠斌张振国
Owner KUNMING UNIV OF SCI & TECH
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