Oxidation treatment process for arsenic-containing acidic wastewater

A technology for oxidation treatment and arsenic pollution acid, which is applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage treatment equipment, etc. It can solve the problem of high cost of arsenic oxidation treatment, achieve strong applicability, low investment, The effect of reducing curing costs

Inactive Publication Date: 2021-04-09
ZIJIN MINING GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The task of the present invention is to overcome the deficiencies in the prior art and provide a process for oxidation treatment of arsenic-containing polluted acid wastewater, which can effectively solve the problem of high cost of oxidation treatment of arsenic in arsenic-containing polluted acid in the production process of non-ferrous metal smelting industry. It can also provide a more environmentally friendly and cost-effective arsenic oxidation technology

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  • Oxidation treatment process for arsenic-containing acidic wastewater
  • Oxidation treatment process for arsenic-containing acidic wastewater
  • Oxidation treatment process for arsenic-containing acidic wastewater

Examples

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Embodiment 1

[0046] The content of arsenic in the copper concentrate in a copper smelter in northern my country is 0.45%, and the polluted acid produced during the smelting process contains 108g / L of sulfuric acid, 10.2g / L of total arsenic, 8.6g / L of trivalent arsenic, and 50.6mg of SS / L, conductivity 126.5ms / cm. The above-mentioned water quality is filtered by PVDF precision filter membrane, and then passed into the anode chamber of the anion diaphragm electrolyzer, and the cathode chamber of the electrolyzer is 150g / L sodium chloride solution; the cathode liquid level is 1.0cm higher than the anode liquid level, and the current density is 250A / m 2 , Control residence time 2.5h. The liquid after anodic oxidation is neutralized by limestone and enters the traditional iron salt solidification process. The concentration of arsenic in the solid waste slag toxic leachate after solidification is 0.2 mg / L, which is lower than the 5 mg / L required by the national hazardous waste identification st...

Embodiment 2

[0048] The arsenic content in copper and gold mines in a copper smelting plant in Fujian is 0.68%. Among the dirty acid produced during the smelting process, sulfuric acid: 95g / L, total arsenic 12.2g / L, trivalent arsenic 9.3g / L, SS120.6mg / L L, conductivity 136.5ms / cm. The above-mentioned water quality is passed through the anode chamber of the PP diaphragm electrolyzer after being precisely filtered by the ceramic membrane. The cathode chamber of the electrolyzer is 180g / L sodium sulfate solution; the cathode liquid level is 2.5cm higher than the anode liquid level and the current density is 350A / m 2 , Control residence time 3.5h. After anodizing, the solution is neutralized with calcium oxide and then enters the traditional iron salt curing process. The concentration of arsenic in the solid waste slag toxic leachate after solidification is 1.5mg / L, which is lower than the 5mg / L required by the national hazardous waste identification standard.

Embodiment 3

[0050] The arsenic content in a smelter of a lead-zinc mine in Guangdong is 0.3%. In the polluted acid produced during the smelting process, sulfuric acid: 98g / L, total arsenic 9.2g / L, trivalent arsenic 7.1g / L, SS150.6mg / L, Conductivity 106.5ms / cm. The above-mentioned water quality is passed through the anode chamber of the anion diaphragm electrolyzer after being precisely filtered by the ceramic membrane. The cathode chamber of the electrolyzer is 200g / L sodium nitrate solution; the cathode liquid level is 2.0cm higher than the anode liquid level and the current density is 250A / m 2 , Control residence time 1.5h. The liquid after anodic oxidation is neutralized by limestone and enters the traditional iron salt solidification process. The concentration of arsenic in the solid waste slag toxic leachate after solidification is 1.5mg / L, which is lower than the 5mg / L required by the national hazardous waste identification standard.

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Abstract

The invention relates to an oxidation treatment process for arsenic-containing acid wastewater. The oxidation treatment process comprises conventional arsenic immobilization via ferric salt and further comprises precision filtration pretreatment and diaphragm electrochemical oxidation. Specifically, the oxidation treatment process comprises the following steps: precision filtration, wherein the acid wastewater is subjected to precision filtration by precision filtration equipment, and a filtrate enters an adjusting tank; treatment with a diaphragm electrolytic cell, wherein the electrolytic cell is divided into an anode chamber and a cathode chamber by using a diaphragm, a soluble salt solution is contained in the cathode chamber, and the filtrate in the regulating tank is pumped into the anode chamber; electrochemical oxidation, wherein a certain current and liquid level of the diaphragm electrolytic cell are controlled for electrochemical oxidation of arsenic; and neutralization and arsenic immobilization via the ferric salt: neutralizing oxidized liquid with alkali and acid, and then immobilizing arsenic with the ferric salt. The process has the advantages that trivalent arsenic in waste acid can be converted into pentavalent arsenic; technological process flow is simple and economical; other ions cannot be introduced, and later arsenic curing cost is greatly reduced; and equipment structure is simple, investment is small, universality is high, and the method is suitable for being applied to the metallurgical and chemical industry.

Description

technical field [0001] The invention relates to an oxidation treatment process for arsenic-containing polluted acid wastewater, which is suitable for application in the metallurgical and chemical industries. Background technique [0002] Arsenic is an element with high abundance on the earth, and it is also the main associated pollutant in the smelting process of non-ferrous and rare metals, and one of the main harmful elements in wastewater of modern chemical industry. The existing arsenic-containing wastewater treatment technology is mainly the iron salt solidification method, which converts arsenic into the most stable form of iron arsenate, thereby reducing the release to the environment. The trivalent state of arsenic(III) needs to be oxidized to pentavalent arsenic(V) before reacting with the iron salt. At present, the commonly used trivalent arsenic oxidants mainly include air, oxygen, ozone, hydrogen peroxide and other chemical reagents. Obviously, the use of chemic...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/22
CPCC02F1/444C02F1/4672C02F1/66C02F9/00C02F2101/22C02F2201/46115
Inventor 季常青庄荣传王乾坤伍赠玲王弘陈启斌
Owner ZIJIN MINING GROUP
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