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Method for removing arsenic and chlorine from acidic wastewater of metallurgical enterprises

A technology of polluted acid wastewater and polluted acid, which is applied in the direction of metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of complex process treatment, low silver regeneration recovery rate, high production cost, etc., to reduce environmental pollution , reduced processing time, shortened response time

Active Publication Date: 2020-04-17
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the removal of chlorine impurities, the current treatment methods for chlorine in lead-zinc smelting in my country include silver sulfate precipitation method, cerium salt method, goethite method, etc. Among them, silver sulfate dechlorination method has good chlorine removal effect and simple operation, but silver salt The price is expensive, the recovery rate of silver regeneration is the highest, and the production cost is high; other chlorine removal methods have low chlorine removal efficiency (about 80%), or the process is complex
[0005] 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, process deal with complex

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  • Method for removing arsenic and chlorine from acidic wastewater of metallurgical enterprises
  • Method for removing arsenic and chlorine from acidic wastewater of metallurgical enterprises

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] 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) 1050mg / 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;

[0138] Add 0.432g iron powder, 14.4mL 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) 24.6mg / L; in the above reaction process, the removal rate of arsenic is 97.66%;

[0139] The pretreated strong basic anion exchange resin (calculated as 10g with dry resin) is packed into a column, then the filtrate I is pumped into the column, and the flow rate of the effluent ...

Embodiment 2

[0141] 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) 1580mg / 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;

[0142] Add 0.648g iron powder, 21.6mL 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 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) 25.0mg / L; in the above reaction process, the removal rate of arsenic was 97.62%;

[0143] The pretreated strong basic anion exchange resin (calculated as 10g with dry resin) is packed into a column, then the filtrate I is pumped into the column, and the flow rate of the effluent II...

Embodiment 3

[0145] 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) 1050mg / 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;

[0146] Add 0.510g iron powder, 17.0mL 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) 21.3mg / L; in the above reaction process, the removal rate of arsenic is 97.97%;

[0147] The pretreated strong basic anion exchange resin (calculated as 10g with dry resin) is packed into a column, then the filtrate I is pumped into the column, and the flow rate of the effluent ...

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Abstract

The invention relates to a method for removing arsenic and chlorine in acidic wastewater of metallurgical enterprises so as to remove arsenic and chlorine in acidic wastewater. The method comprises the following steps: simultaneously adding a certain amount of iron powder and a copper sulfate solution into acidic wastewater, stirring, reacting for a set time, generating precipitate, and carrying out solid-liquid separation to obtain a filtered solution and precipitate impurities; and continuously carrying out adsorption exchange dechlorination on the filtrate by using an ion exchange resin. According to the arsenic removal method provided by the invention, the generation of lime slag is effectively reduced, arsenic impurity ions in waste acid are effectively removed, and the arsenic removal efficiency is high; other impurities are prevented from being introduced during chlorine removal, the treated acid and water can be reused in a workshop section, and the pollution to the environmentis reduced; the increase of the whole solution temperature of waste acid is avoided, and energy consumption in the production process is reduced; and economic benefits and environmental benefits arecomprehensively realized.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for removing arsenic and chlorine from polluted acid waste liquid in metallurgical enterprises. Background technique [0002] A large amount of sulfur dioxide flue gas produced in the metal smelting process is mainly used for acid production from flue gas. A large amount of sulfuric acid wastewater is generated in the washing and pickling process of the flue gas acid production process, commonly known as "dirty acid", and its composition is very complex. 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 impur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/10C02F101/12C02F103/16
CPCC02F9/00C02F1/02C02F1/001C02F1/28C02F1/42C02F1/58C02F2101/103C02F2101/12C02F2103/16
Inventor 李静罗永光张利波席云浩邹景田曲洪涛马云川谢庭芳李红权林国保佳懿顾利坤王仕兴付光皮忠斌张振国
Owner KUNMING UNIV OF SCI & TECH
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