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Method for purifying chlorine-containing wastewater discharged during zinc hydrometallurgy

A technology for zinc hydrometallurgy and wastewater purification, which is applied in chemical instruments and methods, electrolysis process, metallurgical wastewater treatment, etc., can solve the problems such as the difficult treatment of chlorine-containing wastewater, and achieve the effect of high utilization rate and mild reaction conditions

Inactive Publication Date: 2017-09-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, at present, the ion exchange method is used to remove chloride ions in the zinc electrolyte, and there is a problem that chlorine-containing wastewater is difficult to treat. Therefore, a purification method for resin dechlorination wastewater needs to be developed urgently, so that the dechlorination wastewater can be used as regenerated liquid recycling

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  • Method for purifying chlorine-containing wastewater discharged during zinc hydrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) After the oxygen is decompressed, the flow rate is controlled by the flow meter and then introduced into the ozone generator. The internal discharge tube of the ozone generator converts part of the oxygen into ozone under the action of a high-voltage, high-frequency electric field, and the generated ozone and unionized gas Form a mixed gas, wherein the ozone concentration in the mixed gas is 55 mg / L.

[0021] (2) Disperse the mixed gas obtained in step (1) evenly through a gas distributor and mix it with a chlorine ion concentration of 1000 mg / L, a sulfuric acid concentration of 50 g / L, a zinc ion concentration of 4 g / L, and a manganese ion concentration. Concentration of 0.1 g / L of wastewater at 70 ° C conducts contact reaction for 60 min, completes dechlorination and discharges waste gas containing a small amount of chlorine.

[0022] (3) The chlorine ion concentration of the wastewater treated in step (2) is 80 mg / L, and the dechlorination rate is 92%.

[0023]...

Embodiment 2

[0026] (1) After the oxygen is decompressed, the flow rate is controlled by the flow meter and then introduced into the ozone generator. The internal discharge tube of the ozone generator converts part of the oxygen into ozone under the action of a high-voltage, high-frequency electric field, and the generated ozone and unionized gas Form a mixed gas, wherein the ozone concentration in the mixed gas is 75 mg / L.

[0027] (2) Disperse the mixed gas obtained in step (1) evenly through the gas distributor, and then mix it with the chlorine ion concentration of 1500 mg / L, sulfuric acid concentration of 25 g / L, zinc ion concentration of 10 g / L, manganese ion concentration The concentration of wastewater is 5 g / L at 30 ° C carries out contact reaction for 180 min, completes dechlorination and discharges waste gas containing a small amount of chlorine.

[0028] (3) The chlorine ion concentration of the wastewater treated in step (2) is 250 mg / L, and the dechlorination rate is 83.33%....

Embodiment 3 1）

[0031] Embodiment 3 (1) After the oxygen is decompressed, the flow rate is controlled by the flow meter and then introduced into the ozone generator. The internal discharge tube of the ozone generator converts part of the oxygen into ozone under the action of a high-voltage, high-frequency electric field. The ionized gas forms a mixed gas, and the ozone concentration in the mixed gas is 150 mg / L.

[0032] (2) Disperse the mixed gas obtained in step (1) evenly through the gas distributor, and then mix it with the chlorine ion concentration of 2000 mg / L, sulfuric acid concentration of 100 g / L, zinc ion concentration of 25 g / L, manganese ion concentration The concentration of wastewater is 3 g / L at 50 ° C carries out contact reaction for 120 min, completes dechlorination and discharges waste gas containing a small amount of chlorine.

[0033] (3) The chlorine ion concentration of the wastewater treated in step (2) is 150 mg / L, and the dechlorination rate is 92.5%.

[0034] (4) Pa...

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Abstract

The invention discloses a method for purifying chlorine-containing wastewater discharged during zinc hydrometallurgy. The process comprises the following steps: controlling flow of oxygen or air by a mass flow meter; feeding into an ozone generator after measurement; converting some oxygen into ozone under action of a high-pressure and high-frequency electric field by a discharge tube in the ozone generator; combining the generated ozone with unionized gas to form a mixed gas; uniformly dispersing the mixed gas by a gas distributor, then performing contact reaction on the mixed gas and chlorine-containing wastewater having a certain temperature so as to complete dechlorination; and feeding a tail gas into the ozone generator again after absorbing chlorine by lye so as to realize circulation. The method provided by the invention is mild in reaction condition, high in dechlorination rate, and low in cost due to the regenerated manganese oxide can be returned to a zinc hydrometallurgy system.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and metallurgy, and mainly relates to a method for purifying chlorine-containing waste water discharged during zinc hydrometallurgy. Background technique [0002] At present, 80%~85% of the world's zinc production is produced by the wet process, that is, roasting-leaching-purification-electrodeposition. As raw materials, chloride ions accumulate rapidly in the system, and some chloride ion concentrations are even as high as several thousand mg·L -1 . High concentration of chloride ions will not only aggravate the corrosion of equipment and pipelines, but also damage the anode and cathode during the electrowinning process. Chloride ions corrode the anode, increase the lead content in the electrolyte, increase the lead content of the precipitated zinc and reduce the grade, and shorten the life of the anode. Chloride ions may also be oxidized to chlorate at the anode, which intensifies th...

Claims

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Application Information

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IPC IPC(8): C02F1/78C25C7/06C02F101/12C02F103/16
CPCC02F1/78C02F2101/12C02F2103/16C02F2201/782C25C7/06
Inventor 吕莉刘维燥李春胡晓伟袁绍军
Owner SICHUAN UNIV
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