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Ultrasonic-enhanced method for removing arsenic in waste acid

A technology of ultrasonic wave and dirty acid, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high cost of gypsum slag treatment, high acid and water consumption, and serious waste of resources. Achieve the effects of improving economic and environmental benefits, saving time, and shortening response time

Active Publication Date: 2020-04-14
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing sewage acid treatment process has the following problems: high direct cost of treatment, serious waste of resources, complex process operation; high cost of gypsum slag treatment; large acid and water consumption of the enterprise itself

Method used

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  • Ultrasonic-enhanced method for removing arsenic in waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Take 100mL of dirty acid solution and add it into the reaction kettle and preheat it 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;

[0129] At the same time, add 0.43g of iron powder and 14.4mL of 50g / L copper sulfate solution to the dirty acid, and stir;

[0130] Then add ultrasonic waves to strengthen the dirty acid, the ultrasonic power is 100W, the frequency is 20kHz, the temperature of the dirty acid is maintained at 35°C, and the ultrasonic strengthening reaction is completed in 10 minutes to obtain a solid-liquid mixture;

[0131] The above-mentioned solid-liquid mixture is suction-filtered to obtain the filtrate and filter residue, and the content of arsenic in the filtrate is measured, and As (as H 3 AsO 3 Form) 1.47mg / L, in the above reaction process, the removal rate of arsenic is 99.86%.

Embodiment 2

[0133] Take 100mL of dirty acid solution and add it into the reaction kettle and preheat it 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;

[0134]At the same time, add 0.648g of iron powder and 21.6mL of 50g / L copper sulfate solution to the dirty acid, and stir;

[0135] Then add ultrasonic waves to strengthen the dirty acid, the ultrasonic power is 100W, the frequency is 20kHz, the temperature of the dirty acid is maintained at 35°C, and the ultrasonic strengthening reaction is completed in 10 minutes to obtain a solid-liquid mixture;

[0136] The above-mentioned solid-liquid mixture is suction-filtered to obtain the filtrate and filter residue, and the content of arsenic in the filtrate is measured, and As (as H 3 AsO 3 form) 2.06mg / L, in the above reaction process, the removal rate of arsenic is 99.870%.

Embodiment 3

[0138] Take 100mL of dirty acid solution and add it into the reaction kettle and preheat it to 35°C. The dirty acid contains As (as H 3 AsO 3 form) 966mg / 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;

[0139] At the same time, add 0.396g of iron powder and 13.2mL of 50g / L copper sulfate solution to the dirty acid, and stir;

[0140] Then add ultrasonic waves to strengthen the dirty acid, the ultrasonic power is 100W, the frequency is 20kHz, the temperature of the dirty acid is maintained at 35°C, and the ultrasonic strengthening reaction is completed in 10 minutes to obtain a solid-liquid mixture;

[0141] The above-mentioned solid-liquid mixture is suction-filtered to obtain the filtrate and filter residue, and the content of arsenic in the filtrate is measured, and As (as H 3 AsO 3 Form) 2.46mg / L, in the above reaction process, the removal rate of arsenic is 99.745%.

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Abstract

The invention relates to an ultrasonic-enhanced method for removing arsenic in waste acid. The method comprises the following specific steps: simultaneously adding a certain amount of a metal powder and a sulfate solution into the waste acid, then applying ultrasonic waves for enhancing, reacting for a certain period of time, generating precipitate, and carrying out solid-liquid separation to obtain a filtered solution and precipitate impurities. According to the method provided by the invention, the generation of lime slag is effectively reduced, arsenic impurity ions in waste acid are effectively removed, the treated acid can be reused in a workshop section, and meanwhile, the pollution to the environment is reduced; meanwhile, the increase of the whole solution temperature of the wasteacid is avoided, and the energy consumption in the production process is reduced; and economic benefits and environmental benefits are comprehensively realized.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to an ultrasonic-strengthened method for removing impurities from a dirty acid solution. Background technique [0002] At present, the dirty acid solution discharged from the roasting flue gas acid production of enterprises often contains impurities such as arsenic, chlorine, and fluorine, which are very harmful to the environment, and in terms of comprehensive utilization of resources, it is also necessary to separate them It is absolutely necessary, so that dirty acid can be turned into treasure. [0003] For the removal of arsenic impurities, at present, lead and iron smelting enterprises mainly adopt the terminal treatment method, specifically adopting lime neutralization iron salt method for sewage acid treatment. Among the polluted acid, the arsenic is mainly arsenous acid (H 3 AsO 3 ) form exists. In the current sewage acid treatment operations in enterprises, lime under no...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/10C02F103/18
CPCC02F9/00C02F1/02C02F1/58C02F1/36C02F1/001C02F2101/103C02F2103/18
Inventor 罗永光张利波李静邹景田曲洪涛席云浩谢庭芳林国顾利坤王仕兴付光皮忠斌保佳懿张振国
Owner KUNMING UNIV OF SCI & TECH
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