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Treatment process of polluted acid water containing heavy metals such as arsenic, copper and zinc in copper smelting industry

A treatment process and copper smelting technology, which is applied in the field of treatment process of heavy metal polluted acid water, can solve the problems of inability to meet emission standards, high consumption cost, limited effect, etc., and achieve short reaction time, strong oxidation effect, and strong catalytic performance. Effect

Active Publication Date: 2018-03-13
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Jinlong Copper Co., Ltd. and others have used the sodium sulfide method to treat high-arsenic-containing wastewater, and added a sufficient amount of sodium sulfide to the sewage acid water. In order to ensure the acidity of the wastewater, a large amount of sulfuric acid needs to be added, which consumes a lot of money and has achieved good results. Limited, far from meeting the requirements of emission standards, the removal rate of arsenic in this method is increased to more than 95%, and the remaining 5% is still treated by iron salt-lime method

Method used

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  • Treatment process of polluted acid water containing heavy metals such as arsenic, copper and zinc in copper smelting industry
  • Treatment process of polluted acid water containing heavy metals such as arsenic, copper and zinc in copper smelting industry
  • Treatment process of polluted acid water containing heavy metals such as arsenic, copper and zinc in copper smelting industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 The schematic diagram shown: take the polluted acid water of Tongling Jinlong Copper Industry, the pH of the polluted acid water is 0.56, and the pollution factors contained in the polluted acid water include arsenic, copper, zinc, cadmium, etc. 10% lanthanum chloride, 80% iron and 10% carbon are sintered at a high temperature of 990 degrees to produce a special iron-carbon filler pretreatment reactor. The reaction time is 30 minutes, the pH of the effluent is 1.10, and the mass fraction is 0.1 % oxidant hydrogen peroxide, adjusted to about 2.0 with calcium oxide, stirred and reacted for 60 minutes, then added calcium oxide to adjust the pH to about 10, added PAM, stirred at a slow speed for 10 minutes, filtered, adjusted the pH of the filtrate to about 7 with hydrochloric acid, and measured the supernatant content of pollutants. The measurement data are shown in Table 2.

[0037] Table 2 Experimental measurement data

[0038]

[0039] It can be s...

Embodiment 2

[0043] Such as figure 1 The schematic diagram shown: take the polluted acid water of Tongling Jinlong Copper Industry, the pH of the polluted acid water is 0.56, and the pollution factors contained in the polluted acid water include arsenic, copper, zinc, cadmium, etc. 30% cerium chloride, 50% iron and 20% carbon are sintered at a high temperature of 990 degrees to produce a special iron-carbon filler pretreatment reactor. The reaction time is 40 minutes, the pH of the effluent is 1.25, and the mass fraction is 10 % oxidant sodium hypochlorite, adjusted to about 2.5 with calcium oxide, stirred for 60 minutes, then added calcium oxide to adjust the pH to about 9.5, added PAM, stirred at a slow speed for 10 minutes, filtered, adjusted the pH of the filtrate to about 7 with hydrochloric acid, and measured the supernatant content of pollutants. The measurement data are shown in Table 3.

[0044] Table 3 Experimental measurement data

[0045]

[0046] It can be seen from the ...

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Abstract

The invention discloses a process for treating polluted acid water containing heavy metals such as arsenic, copper, zinc, etc. in the copper smelting industry. In the catalytic oxidation reactor, the reaction time is 10-60min; (2) add an oxidant with a mass fraction of 0.1-10% to the effluent in step (1) for oxidation, and the oxidation reaction time is 30-120min. During the oxidation process Adjust the pH of the solution in the range of 2.0-2.5; (3) adjust the pH value of the fully reacted solution in step (2) greater than 9.2, and the reaction time is 10-120min; (4) Precipitate the solution obtained in step (3) , filter, adjust the pH to 6‑9, and discharge heavy metals up to the standard. The invention can directly treat the polluted acid water with strong acidity (pH<1), without adjusting the pH value, and has good removal effect of heavy metal ions.

Description

technical field [0001] The invention belongs to the field of sewage acid water treatment, and in particular relates to a process for treating sewage acid water high in arsenic, copper, zinc and other heavy metals in the copper smelting industry. Background technique [0002] The non-ferrous metal industry occupies an important position in modern industry, and acid-containing wastewater is the main pollutant produced in the copper smelting industry. The main sources of dirty acid water are the flue gas washing in the smelting section, the acid production stage of flue gas recovery, and the electrolyte section. More than 90% of. The amount of water produced by polluted acid water is huge and strongly acidic. If it is directly discharged into the municipal sewage pipe network, it will seriously affect the normal operation of urban sewage treatment plants. If it is discharged into the external environment, the water quality will deteriorate and the treatment is difficult. It i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/20C02F103/16
CPCC02F1/281C02F1/461C02F1/5236C02F9/00C02F2101/103C02F2101/20C02F2101/22C02F2103/16C02F2301/08
Inventor 韩正昌马军军高亚娟张寅丞崔洪磊朱伯淞何建龙朱家明
Owner NANJING GW ENVIRONMENT ENG