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Process for treating polluted acid water in copper smelting by utilizing calcium and magnesium desulfurization sludge

A magnesium-based desulfurization and sludge treatment technology, applied in water/sludge/sewage treatment, water/sewage treatment, neutralized water/sewage treatment, etc. Problems such as expansion of the warehouse occur, and the effects of significant economic and environmental benefits, saving processing costs and reducing expenses are achieved.

Active Publication Date: 2016-05-25
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the desulfurization sludge is produced in a large amount, so there will be a phenomenon of bank expansion
At present, there are still some technologies, such as pyrolysis of desulfurization to decompose solids into SO 2 And solids containing magnesium oxide, etc., due to high cost and secondary pollution, its engineering application is hindered

Method used

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  • Process for treating polluted acid water in copper smelting by utilizing calcium and magnesium desulfurization sludge
  • Process for treating polluted acid water in copper smelting by utilizing calcium and magnesium desulfurization sludge
  • Process for treating polluted acid water in copper smelting by utilizing calcium and magnesium desulfurization sludge

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Effect test

Embodiment 1

[0041] Such as figure 1 Schematic diagram of the flow shown: Take the sewage acid water of Tongling Jinlong Copper Industry in Anhui Province and the desulfurization sludge produced by magnesium desulfurization in its factory. The pH of the sewage acid water is 0.56, and the pollution factors contained in the sewage acid water include arsenic, copper, and zinc. , cadmium, etc. After the desulfurization sludge is concentrated, the moisture content is reduced to about 60%. Put the polluted acid water directly into the pretreatment reactor containing 10% lanthanum chloride, 80% iron and 10% carbon sintered at a high temperature of 990 degrees. The reaction time is 30 minutes, and the effluent and concentrated The final sludge (calculated with a water content of 60%) was mixed according to the mass ratio of 1:0.8, stirred for 40 minutes, and the pH of the slurry was maintained between 2-4. The main reactions that occurred were:

[0042] MgSO 3 +H 2 SO 4 → MgSO 3 +SO 2 +H 2 ...

Embodiment 2

[0056] Such as figure 1 Schematic diagram of the flow shown: Take the sewage acid water of Tongling Jinlong Copper Industry in Anhui Province and the desulfurization sludge produced by magnesium desulfurization in its factory. The pH of the sewage acid water is 0.56, and the pollution factors contained in the sewage acid water include arsenic, copper, and zinc. , cadmium, etc. After the desulfurization sludge is concentrated, the moisture content is reduced to about 60%. Put the polluted acid water directly into the pretreatment reactor containing special iron-carbon fillers loaded with 30% cerium chloride, 50% iron and 20% carbon and sintered at a high temperature of 990 degrees. The reaction time is 20 minutes, and the effluent Mix with concentrated sludge (based on water content of 60%) according to the mass ratio of 1:1.0, stir for 40 minutes, maintain the pH of the slurry between 2-4, add 10% oxidant hydrogen peroxide, and stir for 90 minutes , then add calcium oxide to ...

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Abstract

The invention discloses a process for treating polluted acid water in copper smelting by utilizing calcium and magnesium desulfurization sludge. The process comprises the steps of (1) directly injecting the polluted acid water under the strong acid condition that the pH value is less than 1 into a catalytic oxidization device with special ferric carbon fillers, and reacting for 10-60 minutes; (2) mixing the polluted acid water after the reaction in the step (1) with concentrated and dehydrated calcium and magnesium desulfurization sludge (based on the water content of 60%) according to a mass ratio of 1 to (0.2-1.2), stirring, reacting for 10-120 minutes, and maintaining the pH value of slurry to be 2-4; (3) adding an oxidizer into the slurry obtained in the step (2) and reacting for 10-120 minutes; (4) performing a neutralization reaction of the slurry obtained in the step (3) and adjusting the pH value of the slurry to be more than 9.2; and (5) precipitating and filtering a solution obtained in the step (4), adjusting the pH value of a filter liquor to be 6-9, and discharging heavy metal by standard. According to the process, the problems in treatment of the calcium and magnesium desulfurization sludge and the polluted acid water can be directly and synchronously solved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a process for treating copper smelting sewage acid water by using calcium and magnesium desulfurization sludge. Background technique [0002] The main sources of dirty acid water in the copper smelting industry 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 acid wastewater is produced. Stained acid water contains a large amount of arsenic, cadmium, lead, zinc, copper and other elements, especially arsenic, which greatly increases the toxicity of polluted acid water. Therefore, in the process of treating polluted acid water, arsenic and heavy metal elements in polluted acid water must also be removed at the same time. The amount of water produced by polluted acid water is huge and strongly acidic. If it is directly discharged into the municipal sewage pipe networ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/52C02F1/66C02F1/725C02F9/00C02F2103/16C02F2301/08
Inventor 韩正昌高亚娟马军军崔洪磊张寅丞朱伯淞王云枫张寿兵
Owner NANJING GW ENVIRONMENT ENG
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