A method for removing arsenic by ultrasonic self-cleaning in polluted acid

A technology of ultrasonic wave and dirty acid, which is applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of high cost of gypsum slag treatment, high acid consumption and water consumption, and arsenic removal process High cost and other issues, to achieve the effect of shortening the response time, saving time, and improving environmental benefits

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

[0005] The existing polluted acid arsenic removal process has high cost, serious resource waste, and complex process operation; the generated gypsum slag has high treatment costs; the enterprise itself consumes a lot of acid and water

Method used

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  • A method for removing arsenic by ultrasonic self-cleaning in polluted acid
  • A method for removing arsenic by ultrasonic self-cleaning in polluted acid
  • A method for removing arsenic by ultrasonic self-cleaning in polluted acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Take 100mL of dirty acid solution and add it into the reaction kettle and stir to preheat to 35°C. The main component of dirty acid is As (as H 3 AsO 3 form) 735mg / L, Cl (as Cl - form) 1320mg / L, Pb (as Pb 2+ form) 116mg / L, Cd (as Cd 2+ form) 101.7mg / L, Cu (as Cu 2+ form) 2.86mg / L, F (in the form of F - form) 456mg / L, pH=1.2;

[0080] Use the ultrasonic device described in the present invention to add ultrasonic strengthening treatment to the dirty acid, the ultrasonic power is 100W, the temperature of the dirty acid is maintained at 35°C, and the ultrasonic strengthening reaction is completed in 30 minutes to obtain a solid-liquid mixture;

[0081] 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) 0.44mg / L; in the above reaction process, the removal rate of arsenic was 99.94%.

Embodiment 2

[0083] Take 100mL of dirty acid solution and add it into the reaction kettle and stir to preheat to 35°C. The main component of dirty acid is 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, Cu (as Cu 2+ form) 4.57mg / L, F (in the form of F - form) 502mg / L, pH=1.0;

[0084] Use the ultrasonic device described in the present invention to add ultrasonic strengthening treatment to the dirty acid, the ultrasonic power is 100W, the temperature of the dirty acid is maintained at 35°C, and the ultrasonic strengthening reaction is completed in 30 minutes to obtain a solid-liquid mixture;

[0085] 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) 1.3mg / L; in the above reaction process, the removal rate of arsenic was 99.83%.

Embodiment 3

[0087] Take 100mL of dirty acid solution and add it into the reaction kettle and stir to preheat to 35°C. The main component of dirty acid is As (as H 3 AsO 3 form) 525mg / L, Cl (as Cl - form) 1103mg / L, Pb (as Pb 2+ form) 156mg / L, Cd (as Cd 2+ form) 86.5mg / L, Cu (as Cu 2+ form) 0.86mg / L, F (in the form of F - form) 598mg / L, pH=1.5;

[0088] Use the ultrasonic device of the present invention to add ultrasonic waves to strengthen the dirty acid, the power of the ultrasonic wave is 100W, the temperature of the dirty acid is maintained at 35°C, and the ultrasonic strengthening reaction is completed in 30 minutes to obtain a solid-liquid mixture;

[0089] 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) 0.37mg / L; in the above reaction process, the removal rate of arsenic was 99.93%.

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Abstract

The invention relates to a method for removing arsenic by ultrasonic self-cleaning in polluted acid. It does not need to add any reagents, but only uses self-developed ultrasonic device to carry out ultrasonic intensified treatment on polluted acid, so as to achieve the purpose of efficiently removing arsenic. The specific steps include: Ultrasonic is added to the polluted acid to strengthen, react for a certain period of time, and precipitate is formed, and solid-liquid separation is carried out to obtain the filtered solution and precipitated impurities. According to the arsenic removal method provided by the present invention, the arsenic impurities in the dirty acid can be removed efficiently, and the process is simple, and the cost is greatly reduced. At the same time, the treated acid and water can be reused in the zinc oxide dust recovery section, reducing the Pollution to the environment; at the same time, it avoids a large amount of waste of acid and water in the polluted acid, and does not add any arsenic removal reagents, which reduces the treatment cost, and does not introduce other impurities, energy saving and environmental protection.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for ultrasonically intensified treatment of arsenic in polluted acid solution. 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 produce sulfuric acid not only eliminates smoke hazards, but also creates value. However, in the process of using flue gas to produce sulfuric acid, the arsenic, cadmium, chlorine, etc. in it are transferred to the "polluted acid" produced by washing the flue gas. [0003] However, impurities such as arsenic, chlorine, and fluorine are very harmful to the environment, and in terms of comprehensive utilization of resources, it is absolutely necessary to separate them, so that the polluted acid solution can be recycled and reused. [0004] For the removal of arsenic impurities, at present, the lead, iron and zinc smelting en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/36C02F101/10C02F101/12C02F101/14C02F101/20C02F103/16
CPCC02F1/36C02F2101/103C02F2101/101C02F2101/20C02F2101/12C02F2101/14C02F2103/16
Inventor 张利波李静罗永光邹景田曲洪涛席云浩张侯文付光李云张特保佳懿张宏廖天棋
Owner KUNMING UNIV OF SCI & TECH
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