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Method for treating and recycling lead-zinc sulfide ore dressing wastewater

A lead-zinc sulfide and mineral processing wastewater technology, applied in mining wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. problems, to achieve the effect of eliminating the impact and prolonging the service life

Active Publication Date: 2010-12-15
HUNAN HERMES SAFE ENVIRONMENT PROTECTION SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the recycling rate of mineral processing wastewater in the domestic lead-zinc mineral processing industry is relatively low, and the degree of resource utilization is not high. According to incomplete statistics, the wastewater reuse rate of domestic large and medium-sized lead-zinc mineral processing enterprises is lower than 75%. The main problem is: the backwater system is complicated, and the operation and management cannot keep up with it, which often leads to abnormal system backwater and unstable water quality, making it difficult to ensure long-term stable return water quality requirements
[0009] To sum up, at present, the processing wastewater of complex lead-zinc sulfide mines contains heavy metals, and the processing cost of residual mineral processing agents is high, so it cannot be discharged up to the standard; or the reuse of mineral processing wastewater in production affects the mineral processing indicators such as the recovery rate of lead and zinc; or the recycling rate of mineral processing wastewater Not high, causing environmental pollution when discharged

Method used

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  • Method for treating and recycling lead-zinc sulfide ore dressing wastewater
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  • Method for treating and recycling lead-zinc sulfide ore dressing wastewater

Examples

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Effect test

Embodiment 1

[0036] Example 1: For the treatment of mineral processing wastewater produced by the lead-zinc sulfide mine of Hunan Baoshan Nonferrous Metals Mining Co., Ltd. using potential-regulated flotation and environmental protection collector combined application technology, the water quality components of the wastewater are shown in Table 1, and 10% sulfuric acid is first used to adjust the wastewater PH value to PH=10.24, then add a certain concentration of ferrous sulfate and flocculant polyacrylamide, stir, let stand for 60 minutes and then take samples for analysis, when the dosage of ferrous sulfate is 50-200mg / l, add flocculant When the amount is 1.0mg / l, the concentration of heavy metal ions, CODcr, and petroleum in the treated water have all reached a lower level, and the water quality is relatively clear. The treatment results are shown in Table 2.

[0037] Table 1 Mineral processing wastewater composition table Unit: mg / l

[0038] project

pH

COD

Petro ...

Embodiment 2

[0041] Embodiment 2: For the beneficiation wastewater produced by Hunan Baoshan Nonferrous Metal Mining Co., Ltd. lead-zinc sulfide ore, adjust the pH value to PH=9.5, add a certain concentration of ferrous sulfate and flocculant, stir, and take it after standing for 60 minutes For the clear liquid, add chlorine dioxide to the treated water, sample and analyze after 60 minutes of oxidation, when the dosage of ferrous sulfate is 100mg / l, when the dosage of 3# flocculant (polyacrylamide) is 1.0mg / l , when the dosage of chlorine dioxide is 10-20mg / l, the concentration of heavy metal ions, phenol, CODcr, etc. in the treated water will reach a lower level, and the water quality will be relatively clear, which can reach the relevant national sewage comprehensive discharge standards. The treatment results are shown in the table 3.

[0042] Table 3 Oxidation treatment results after flocculation treatment of mineral processing wastewater Unit: mg / l

[0043] Chlorine dioxide (...

Embodiment 3

[0044] Example 3: Add a certain concentration of ferrous sulfate and flocculant (polyacrylamide) to the ore dressing wastewater whose pH value is adjusted to 9.5, stir, take the supernatant after standing for 60 minutes, and add carbon dioxide to the treated water Chlorine 20mg / l, after oxidizing for 30 minutes, treat with the reaction bed that uses activated carbon as the medium, the activated carbon bed device (see figure 2 ) device size: φ18×20cm; activated carbon filling height: 16cm, when the dosage of ferrous sulfate is 100mg / l, the dosage of 3# flocculant is 1.0mg / l, chlorine dioxide is 20mg / l, the adsorption device When the residence time is 30min; the phenol, petroleum and CODcr in the treated water are all at a lower level, and the water quality is relatively clear. The analysis results of the treated water are shown in Table 4.

[0045] Table 3 Catalytic oxidation adsorption treatment results after flocculation oxidation treatment of mineral processing wastewater U...

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Abstract

The invention provides a technique for treating and recycling lead-zinc ore dressing wastewater and aims to solve the problems of influence on the ore dressing index due to the recycling of the ore dressing wastewater for production and environmental pollution caused by drainage. The novel technique for treating and recycling the lead-zinc sulfide ore dressing wastewater comprises the steps of: adjusting the pH value of the total wastewater of an ore dressing plant; adding ferrous sulfate and flocculant into the wastewater to perform oxidation-coagulation treatment; and oxidizing the treated water by using chlorine dioxide, and performing catalytic oxidation and adsorption by using an active carbon bed, so that the treated water reaches the relevant discharge standard of China; and totally recycling the treated water by adopting the combined application of potential-controlled flotation and an environmental-protection collector. Compared with the field process technique, the method saves the cyanide flotation process and improves the recovery rates of lead, zinc and gold. The method provides whole technical integration of the combined application technique of the potential-controlled flotation and the environmental-protection collector and the wastewater treatment technique for the treatment and recycling of the lead-zinc ore dressing wastewater, and realizes recycling of the ore dressing wastewater.

Description

technical field [0001] The invention relates to a method for treating and reusing mine beneficiation wastewater, in particular to a technology for treating and reusing lead-zinc ore beneficiation wastewater. Background technique [0002] my country is rich in lead-zinc ore resources, mainly sulfide ore. With the development of my country's lead-zinc mineral processing industry, lead-zinc mines are one of the main sources of heavy metal pollution, and the environmental pollution caused by the discharge of mineral processing wastewater is becoming increasingly serious, especially for water. damage of environment. Implement mineral processing wastewater treatment and reuse, realize zero discharge of mineral processing wastewater, increase industrial water reuse rate, not only save water resources, but also reduce the discharge of heavy metal pollutants, thereby achieving clean production. [0003] In the beneficiation process of lead sulfide ore, a large number of flotation age...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10
Inventor 彭新平陈伟陈代雄刘锡桂吴兆清王仁芳
Owner HUNAN HERMES SAFE ENVIRONMENT PROTECTION SCI
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