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Electrochemical treatment method for arsenic-containing soot

A treatment method and electrochemical technology, applied in the field of pollutant treatment, can solve the problems of undisclosed treatment of arsenic-containing soot, the increase of harmful components of As in the charge, and the reduction of the processing capacity of the flash furnace, so as to achieve the promotion of oxidation efficiency, reduction of alkali concentration, The effect of reducing energy consumption

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

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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 arsenic-containing soot
[0010] White soot is the soot obtained from flue gas dust collection in the metal smelting process. It is one of the most representative alkaline wastes in the industry at present. It not only contains heavy metal valuable elements such as Pb, Bi, Zn, but also contains harmful elements such as As. If this kind of waste is not disposed of in time, it will not only cause serious environmental pollution, but also cause a waste of resources.
The commonly used treatment method is to directly return the soot to the smelting system for treatment; the above method not only reduces the processing capacity of the flash furnace and deteriorates the furnace condition, but also increases the harmful components such as As in the charge

Method used

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  • Electrochemical treatment method for arsenic-containing soot
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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0063] An electrochemical treatment method for arsenic-containing soot, wherein the arsenic-containing soot is copper converter white soot, comprising the steps of:

[0064] (1) Ingredients: Mix arsenic-containing soot sieved to 80 mesh with potassium hydroxide aqueous solution to prepare an electrolyte, and preheat to 60°C, wherein the content of potassium hydroxide in the potassium hydroxide solution is 1M, arsenic-containing soot and The liquid-solid ratio of 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 carbon rod as the counter electrode, a mercury / mercury oxide electrode as the reference electrode, the control potential is -1V, the electrochemical reaction time is 4h...

Embodiment 2

[0068] An electrochemical treatment method for arsenic-containing soot, wherein the arsenic-containing soot is copper converter white soot, comprising the steps of:

[0069] (1) Mixing the arsenic-containing soot with a sodium hydroxide solution whose concentration is 0.01M, the solid-to-liquid ratio of the arsenic-containing soot and the sodium hydroxide solution is 0.1g / L to obtain a mixture;

[0070] (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 graphite rod as a working electrode and a platinum electrode as a As the counter ele...

Embodiment 3

[0073] An electrochemical treatment method for arsenic-containing soot, wherein the arsenic-containing soot is copper converter white soot, comprising the steps of:

[0074] (1) mixing the arsenic-containing soot with an alkali solution having a concentration of 10M, the solid-to-liquid ratio of the arsenic-containing soot and the alkali solution being 100g / L to obtain a mixture;

[0075] (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 graphite plate is used as the working electrode in the electrolytic cell, and the graphite plate is the counter electrode. The mercury / mercury oxide ele...

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Abstract

The invention provides an electrochemical treatment method for arsenic-containing soot. The electrochemical treatment method comprises: (1) mixing an alkali and a solvent or mixing an alkali solutionand arsenic-containing soot to obtain a mixture; (2) placing the mixture as an electrolyte in an electrochemical reaction device, carrying out an electrochemical reaction, and introducing an oxidizinggas 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 ishigh 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 arsenic-containing soot. 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 prepare insec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B11/04C25B11/02C25B11/12C22B7/02C22B30/04
CPCC22B7/008C22B7/02C22B30/04C25B1/00C25B11/02C25B11/04C25B11/043Y02P10/20
Inventor 金伟薛玉冬郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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