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Method for ultrasonic self-cleaning arsenic removal in waste 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 and water consumption, and arsenic removal process High cost and other problems, to achieve the effect of improving economic and environmental benefits, reducing the generation of lime residue, and shortening the reaction time

Active Publication Date: 2020-12-01
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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  • Method for ultrasonic self-cleaning arsenic removal in waste acid
  • Method for ultrasonic self-cleaning arsenic removal in waste acid
  • Method for ultrasonic self-cleaning arsenic removal in waste 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 ultrasonic self-cleaning arsenic removal in waste acid. According to the method, the purpose of efficiently removing arsenic can be achieved only by carrying outultrasonic enhancing treatment on the contaminated acid by utilizing an independently-developed ultrasonic device without adding any reagent, and the method comprises the following specific steps: adding ultrasonic waves into the contaminated acid for enhancement, reacting for a certain time, generating precipitate, carrying out solid-liquid separation, and obtaining a filtered solution and precipitate impurities. According to the arsenic removal method, arsenic impurities in the contaminated acid can be efficiently removed, the process is simple, the cost is greatly reduced, and meanwhile, the treated acid and water can be reused in a zinc oxide smoke dust recovery section so that the pollution to the environment is reduced; meanwhile, waste of a large amount of acid and water in waste acid is avoided, any arsenic removal reagent is not added, the treatment cost is reduced, other impurities are not introduced, energy is saved, and the environment is protected.

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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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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