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Electrochemical treatment method for arsenic-containing solid waste

A treatment method, electrochemical technology, applied in the field of pollutant treatment, can solve the problems of narrow scope of application, non-disclosure, inapplicability of toxic solid waste treatment, etc., achieve good effect, reduce energy consumption, and facilitate subsequent separation

Active Publication Date: 2018-09-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method is only applicable to the treatment of organic pollutants present in the liquid phase, and it requires the use of specific catalysts and auxiliary catalysts, which is not applicable to the treatment of toxic solid waste, so the scope of application is narrow
In addition, it does not disclose that the method can be used to treat solid waste containing arsenic

Method used

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  • Electrochemical treatment method for arsenic-containing solid waste
  • Electrochemical treatment method for arsenic-containing solid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A method for processing arsenic-containing smelting waste residue, comprising the steps of:

[0064] (1) Ingredients: Mix the arsenic-containing smelting residue sieved into 80 meshes with potassium hydroxide aqueous solution to prepare an electrolyte and preheat it to 60°C. The content of potassium hydroxide in the potassium hydroxide solution is 1M, containing arsenic and The liquid-solid ratio of arsenic smelting waste residue to potassium hydroxide solution is 1g / L;

[0065] (2) Electrochemical reaction: Add the raw material electrolyte obtained in step (1) into the atmospheric pressure electrolyzer, pass oxygen into the electrolyte, the oxygen flow rate is 400mL / min, the mechanical stirring rate is 800rpm, and the carbon felt electrode is used as the working electrode , with a platinum electrode as the counter electrode and a mercury / mercury oxide electrode as the reference electrode, the control potential is -1V, the electrochemical reaction time is 4h, and the el...

Embodiment 2

[0069] A method for processing arsenic-containing smelting waste residue, comprising the steps of:

[0070] (1) mixing the arsenic-containing smelting waste residue with a sodium hydroxide solution having a concentration of 0.01M, the solid-to-liquid ratio of the arsenic-containing smelting waste residue and the sodium hydroxide solution being 0.1g / L to obtain a mixture;

[0071] (2) The mixture is placed in an electrolytic cell as an electrolyte, and an electrochemical catalytic oxidation reaction is carried out at 20° C. and a stirring speed of 2100 rpm. During the electrochemical catalytic oxidation process, oxygen-enriched air is introduced into the mixture; Wherein, the time of the electrochemical catalytic oxidation reaction is 2h, the voltage of the electrolytic cell is -0.4V, and the flow rate of the oxygen-enriched air is 100mL / min; the electrolytic cell uses a carbon felt electrode as a working electrode, and a platinum electrode As the counter electrode, the mercury...

Embodiment 3

[0075] A method for processing arsenic-containing smelting waste residue, comprising the steps of:

[0076] (1) mixing the arsenic-containing smelting waste residue with an alkali solution having a concentration of 10M, the solid-to-liquid ratio of the arsenic-containing smelting waste residue and the alkali solution being 100g / L to obtain a mixture;

[0077](2) The mixture is placed in an electrolytic cell as an electrolyte, and an electrochemical catalytic oxidation reaction is performed at 140° C. and a stirring speed of 800 rpm, and air is introduced into the mixture during the electrochemical catalytic oxidation process; wherein, The time of the electrochemical catalytic oxidation reaction is 1h, the voltage of the electrolytic cell is -5.0V, and the flow rate of feeding air is 500mL / min; the electrolytic cell uses a carbon felt electrode as a working electrode, and a platinum electrode as a counter electrode, A mercury / mercury oxide electrode is used as a reference elect...

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Abstract

The invention provides an electrochemical treatment method for arsenic-containing solid waste. The electrochemical treatment method comprises: (1) mixing an alkali and a solvent or mixing an alkali solution and arsenic-containing solid waste to obtain a mixture; (2) placing the mixture as an electrolyte in an electrochemical reaction device, carrying out an electrochemical reaction, and introducing an oxidizing gas into the electrolyte during the electrochemical reaction; and (3) carrying out solid-liquid separation on the reaction product obtained in the step (2) to obtain the arsenic-containing solution. According to the present invention, the method has advantages of high extraction rate of arsenic, cleaning property, no pollution, mild process condition, low cost and low requirements on equipment; the impurity is not introduced so as to conveniently perform the subsequent separation; the concentration of the used alkali is low so as to reduce the alkali consumption; and the automation degree is high so as to reduce the manpower input, the good economic and social benefits can be provided, and the good application prospect can be provided.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment and relates to an electrochemical treatment method for solid waste containing arsenic. Background technique [0002] Arsenic compounds are a class of chemical substances with high toxicity to organisms, and are internationally recognized carcinogens. my country is a country that suffers from arsenic damage very seriously, causing bad social impact. Arsenic is a sulfur-friendly metalloid or semi-metal element, and it mainly exists in the form of sulfide, sulfur arsenide, arsenide and arsenate in natural minerals, and it mainly occurs in non-ferrous metal deposits and is produced as an associated mineral of other metals , enriched during the smelting or manufacturing process, gradually forming highly toxic arsenic-containing solid waste. [0003] Arsenic also has special uses in the fields of agriculture, electronics, medicine, metallurgy, and chemical industry. It can be used to prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/22C22B30/04C22B7/00C25C7/06
CPCC22B7/006C22B30/04C25C1/22C25C7/06Y02P10/20
Inventor 金伟薛玉冬郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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