A method for synergistically treating cadmium with a controllable degradation collector in wastewater from lead-zinc sulfide mines

A technology of lead-zinc sulfide and synergistic treatment, applied in chemical instruments and methods, multi-stage water/sewage treatment, light water/sewage treatment, etc., can solve the problems of secondary pollution, high cost, and lack of popularization, and achieve pollution Less, simple process, easy to operate

Active Publication Date: 2021-12-31
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent application with the publication number CN 109607720 A discloses a method for the treatment and reuse of copper-zinc sulfide ore dressing wastewater, which uses a combination of sulfide precipitation and coagulation precipitation, but requires a large number of different types of treatment Chemicals, the cost is high, and it is difficult to control the amount of addition, and there is also the problem of large amount of sludge generation and easy to cause secondary pollution, so it has not been popularized
At present, there is no report on the use of low-pressure vacuum ultraviolet (VUV) lamps to degrade collectors to co-process cadmium ions in lead-zinc mine wastewater

Method used

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  • A method for synergistically treating cadmium with a controllable degradation collector in wastewater from lead-zinc sulfide mines
  • A method for synergistically treating cadmium with a controllable degradation collector in wastewater from lead-zinc sulfide mines
  • A method for synergistically treating cadmium with a controllable degradation collector in wastewater from lead-zinc sulfide mines

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Indoor test 1

[0035] Xanthate concentration and solution pH versus S 2- Effect test of concentration maximum

[0036] Test method: Prepare a standard solution with a xanthate concentration of 100 mg / L as a stock solution. The experiments on the degradation of different concentrations of xanthate and the effect of pH on the maximum value of xanthate were carried out in a cylindrical glass reactor. Take a certain volume of the stock solution and transfer it into the reactor, add deionized water until the final reaction volume is 1.0 L, and place the reactor on a magnetic stirrer to fully stir at a speed of 400 r / min. Irradiate with a low-pressure vacuum ultraviolet lamp (185 nm+254 nm). Samples were taken at 0, 2, 5, 10, 15, 20, 30, 40, 60 min.

[0037] Degradation test of different concentrations of xanthate: adjust the concentration gradient of xanthate to 5, 10, 15, and 25 mg / L, measure the concentration of xanthate and sulfur ion according to the above sampling ...

Embodiment 2

[0048] Indoor test 2

[0049] Simulated wastewater Cd 2+ Removal of Certification Tests

[0050] Test method and steps:

[0051] 1. The xanthate with a concentration of 100 mg / L is used as a stock solution; the cadmium (Cd 2+ ) as the stock solution.

[0052] 2. Cd 2+ Removal qualification tests were performed in a cylindrical glass reactor. Take a certain volume of xanthate stock solution and transfer it to the reactor, add deionized water to a final reaction volume of 1.0 L, prepare a xanthate solution with a concentration of 10 mg / L, and place the reactor at a speed of 400 r / min. On a magnetic stirrer, irradiate with a low-pressure vacuum ultraviolet lamp (185 nm+254 nm) for 30 min.

[0053] 3. Add CdCl to the reactor 2 , so that Cd in the reactor 2+ Concentration of 1 mg / L, sample determination of xanthate concentration and Cd 2+ Concentration (recorded as the first sampling), continue to irradiate with a low-pressure vacuum ultraviolet lamp (185 nm+254 nm) for 10...

Embodiment 3

[0061] Mineral processing wastewater pilot test 1

[0062] The situation of mineral processing wastewater exceeding the standard in the test area is: COD exceeds the standard by 0.8 times, Cd 2+ 1.72 times higher than the standard.

[0063] Test method and steps: 1. If figure 1 As shown, the time from the production of the flotation concentrate to the pressure filtration is controlled within 30 minutes, and the pressure filtration water of the concentrate is immediately passed into the reaction tank 1, and treated with the VUV method for 15 minutes. 2. Pass the treated concentrated ore press water and tailings press water into the reaction pool 2, use the VUV method for 10 minutes, then filter and discharge. Determination of COD and Cd before and after treatment 2+ ,See Figure 7 .

[0064] Data processing and analysis:

[0065] Determination of COD: adopt rapid determination method, refer to "Determination of National Standard Chemical Oxygen Demand (GB11914-89)".

[0...

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Abstract

The invention discloses a method for synergistically treating cadmium with a controllable degradation collector in waste water of a lead-zinc sulfide mine. The present invention uses a low-pressure vacuum ultraviolet lamp (VUV) radiation method to treat lead-zinc ore beneficiation wastewater without adding exogenous substances, controls the degradation condition parameters of the collector xanthate in the wastewater, and promotes the degradation of the collector xanthate. Analyze the sulfide ion (S 2‑ ), sulfur ions and cadmium ions in wastewater (Cd 2+ ) combined to form cadmium sulfide precipitation, so that the wastewater can be discharged up to the standard. The present invention realizes COD and Cd in mineral processing wastewater without adding any chemicals 2+ Cooperative processing has the characteristics of simple processing technology, convenient operation, economical feasibility and wide application.

Description

technical field [0001] The invention belongs to the technical field of beneficiation wastewater treatment, in particular to a method for synergistically treating cadmium with degradation collectors in wastewater from lead-zinc sulfide mines. Background technique [0002] The discharge of mineral processing wastewater in my country is huge, and the composition of mineral processing wastewater is very complex, including collectors, various heavy metal ions, acids and bases, etc. In particular, lead-zinc mines are often associated with cadmium, which enters the mineral processing wastewater during the mineral processing production process to form heavy metal pollutants. If it is directly discharged, except for cadmium exceeding the standard, because it contains a large amount of collectors and other beneficiation agents, the COD index in the wastewater will not meet the discharge standard, and the collectors and heavy metal cadmium will cause harm to humans and animals if they ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F101/30C02F101/20
CPCC02F1/32C02F1/001C02F2101/40C02F2101/20
Inventor 覃朝科毛珺张超兰林达红张静农泽喜周治德
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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