Micro-electrolysis method for lead and zinc smelting waste water

A lead-zinc and waste water technology, which is applied in the micro-electrolysis treatment of lead-zinc smelting waste water and the field of smelting waste water treatment, can solve the problems of secondary pollution, difficulty in disposal, easy scaling of treated water, etc., and achieve simple treatment process and high treatment effect Good results

Inactive Publication Date: 2010-12-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment of lead-zinc smelting wastewater mainly involves neutralization of sulfur precipitation and lime neutralization of precipitation processes, but the reuse of more solid waste (slag) produced by the neutralization method is uneconomical, difficult to dispose of, and easily causes serious secondary pollution. Treated water with high calcium content cannot be reused due to easy scaling

Method used

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  • Micro-electrolysis method for lead and zinc smelting waste water
  • Micro-electrolysis method for lead and zinc smelting waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A lead-zinc smelting smelting waste water volume of 80m 3 / h (continuous flow), composition (mg / L):

[0029] pH: 3.5, Zn: 141.00, Pb: 10.80, Cu: 3.66, Cd: 15.60

[0030] Using the process shown in the drawing, the acidic waste water from lead and zinc smelting is homogenized in the sedimentation tank and enters the iron-carbon bed. The mass ratio of iron to activated carbon is 0.6:1. The clear liquid is reused, and the underflow of the sediment is discharged and then filtered by a filter press. The filtrate is returned to the homogenization tank for treatment, and the filter residue is sent to the production system.

[0031] The hydraulic retention time of the iron-carbon bed is 30 minutes, the pH of the effluent is 6.2, and the pH is adjusted to 7.5 with sodium hydroxide. After precipitation, the supernatant of the sedimentation tank is taken to test the composition (mg / L): pH: 7.1, Zn: 1.69, Pb: 1.20, Cu: 0.23, Cd: 0.65.

Embodiment 2

[0033] A lead-zinc smelter's comprehensive waste water volume is 200m 3 / h (continuous flow), composition (mg / L):

[0034] pH: 3.0, Zn: 148.30, Pb: 9.50, Cu: 2.27, Cd: 11.60, As: 1.21, F: 11.05.

[0035] Using the process shown in the drawing, the acidic wastewater from lead and zinc smelting enters the iron-carbon bed after being homogenized in the grit chamber, and the mass ratio of iron to activated carbon is 1.5:1. The supernatant is reused, and the bottom flow of the sediment is discharged and then filtered by a filter press. The filtrate is returned to the homogenization tank for treatment, and the filter residue is sent to the production system.

[0036] The hydraulic retention time of the iron-carbon bed is 45 minutes, the pH of the effluent is 5.9, the pH is adjusted to 9.5 with sodium hydroxide, and the supernatant of the sedimentation tank is taken to test the composition (mg / L): pH: 8.6, Zn: 2.23, Pb: 1.01, Cu: 0.45, Cd: 0.21, F: 3.22.

Embodiment 3

[0038] A lead-zinc smelting acid production waste water volume 28m 3 / h (continuous flow), composition (mg / L):

[0039] pH: 1.8, Zn: 256.52, Pb: 7.60, Cu: 18.90, Cd: 6.63, As: 4.70, F: 25.20.

[0040] Using the process shown in the drawing, the acidic wastewater from lead and zinc smelting enters the iron-carbon bed after being homogenized in the grit chamber, and the mass ratio of iron to activated carbon is 3:1. The supernatant is reused, and the bottom flow of the sediment is discharged and then filtered by a filter press. The filtrate is returned to the homogenization tank for treatment, and the filter residue is sent to the production system.

[0041] The hydraulic retention time of the iron-carbon bed is 40 minutes, the pH of the effluent is 5.8, and the pH is adjusted to 9.5 with sodium hydroxide. After precipitation, the supernatant of the sedimentation tank is taken to test the composition (mg / L): pH: 8.9, Zn: 4.47, Pb: 0.80, Cu: 0.71, Cd: 0.13, As: 0.48, F: 9.27.

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Abstract

The invention relates to a method for treating smelting waste water, in particular to a micro-electrolysis method for lead and zinc smelting waste water, which belongs to the technical field of environment protection. The method comprises the following steps of: pretreating lead and zinc smelting acid waste water and feeding the pretreated waste water into an iron carbon bed for reacting, wherein the mass ratio of scrap iron to active carbon is 0.5-3:1; recycling most of heavy metal pollutants by performing a micro-electrolysis reaction, wherein a pH value is increased; adjusting the pH to be between 7.5 and 9.5 and generating a flocculating constituent from Fe<2+> and Fe<3+> generated in a previous reaction; precipitating and removing remaining heavy metal ions together with arsenic and fluorine pollutants by adsorption, flocculation and co-precipitation; and recycling supernatant serving as industrial water. The method has the advantages of good treatment effect on the lead and zinc smelting waste water, low cost and capability of recycling heavy metal resources and reusing treating water.

Description

Technical field: [0001] The invention relates to a treatment method for smelting wastewater, in particular to a micro-electrolysis treatment method for lead-zinc smelting wastewater, and belongs to the technical field of environmental protection. Background technique: [0002] With the rapid development of my country's non-ferrous metal industry, the capacity of lead and zinc smelting continues to expand, and the amount of wastewater discharged in the process of smelting and sulfuric acid production is increasing, which not only causes resource loss, corrosion of equipment, sewage charges and other internal uneconomical More importantly, it will pollute the surrounding environment; and with the migration and transformation of heavy metal elements, they will enter the food chain and enrich, seriously endangering the ecological environment and human health. Therefore, the state has set strict standards for the discharge of acid wastewater, requiring smelting and sewage enterpri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F103/16
Inventor 徐晓军李新征罗发生陈映雪邱珉张瑾
Owner KUNMING UNIV OF SCI & TECH
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