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Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water

A technology for recovery and treatment of waste water, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as unfavorable resource utilization, reduction of market circulation value of sulfide slag, and increase in equipment load , to achieve the effect of resource utilization and commercialization, which is conducive to sustainable development and reduces the consumption of vulcanizing agents

Active Publication Date: 2012-12-12
大冶有色金属集团控股有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The percentage of arsenic in sulfide slag is low, generally below 30%, which reduces the market circulation value of sulfide slag and is not conducive to resource utilization;
[0008] 2. The arsenic content in the water after sulfidation is high, mostly above 100mg / L, and the cadmium content is higher. The sulfidation method can only be used as a pretreatment method for arsenic (cadmium), and the arsenic content in the recovered gypsum after the subsequent lime neutralization treatment is high High impact on the quality of gypsum, also not conducive to resource utilization;
[0009] 3. The amount of vulcanizing agent (such as sodium sulfide) far exceeds the theoretical amount, and a large amount of hydrogen sulfide escapes, which will not only increase the processing cost, but also increase the equipment load and affect the environment of the production workshop
[0026] Thioarsenate is soluble in water and this tendency to occur can adversely affect the precipitation of arsenic

Method used

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  • Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water
  • Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water
  • Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0052] Example 1, 250 liters of waste water, test plan: adopt submerged multi-head uniform reaction device, feeding and reaction time: 30 minutes, excessive sodium sulfide 10%, the treatment results are shown in Table 1,

[0053] Table 1

[0054] Element h 2 SO 4 (g / L) As (mg / L) Cu(mg / L) Cd (mg / L) temperature content before treatment 25 3420 459 158.7 30℃ Content in filtrate after treatment 16.7 0.15 not picked up not picked up Content in sulfurized slag after treatment (%) 43.38 Arsenic recovery rate (%) ∝100％ ∝100％

example 2

[0055] Example 2, 250 liters of waste water, test plan: adopt intermittent submerged multi-head evenly distributed reaction device, feeding and reaction time: 30 minutes, sodium sulfide excess 10%, the treatment results are shown in Table 2,

[0056] Table 2

[0057] Element h 2 SO 4 (g / L) As (mg / L) Cu(mg / L) Cd (mg / L) temperature content before treatment 24 (after neutralization) 4900 108.5 291.4 30℃ Content in filtrate after treatment 12.98 0.62 not picked up not picked up Content in sulfurized slag after treatment (%) 35.94 Arsenic recovery rate (%) ∝100％ ∝100％

example 3

[0058] Example 3, 22 cubic meters of waste water (industrial scale)

[0059] Test plan: use submerged multi-head uniform reaction device, feeding and reaction time: 120 minutes, sodium sulfide excess 10%, treatment results are shown in Table 3,

[0060] table 3

[0061] Element h 2 SO 4 (g / L) As (mg / L) Cu(mg / L) Cd (mg / L) temperature content before treatment 42.17 4.14 350 180 30℃ Content in filtrate after treatment 11.56 0.13 / 0.6 Content in sulfurized slag after treatment (%) 30.09％ / Recovery rate(%) ∝100％ 99.7％

[0062] As can be seen from the above test results, the present invention effectively prevents the "local overconcentration phenomenon" and the "escaping" of hydrogen sulfide, which is to improve the vulcanization efficiency, reduce the consumption of vulcanizing agent, increase the percentage of arsenic in the vulcanization slag, and reduce the vulcanization...

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Abstract

The invention discloses a method and a device for reclaiming and treating wastewater with high acidity, high arsenic and high cadmium, and relates to a method for reclaiming arsenic and cadmium in the wastewater with high acidity. The following steps are adopted: SO2 in the wastewater is removed; a certain quantity of lime is added into desulfated wastewater, and is filtered; filtrate is separated and led in a treatment device, wherein the treatment device is a uniform reactor with a plurality of heads of immersion type; vulcanizing agent is led in a medicine distributing chamber from a feeding pipe, evenly distributed, and added into the separated filtrate; As2S3 is generated by As3+ after a reaction, and CdS is generated by Cd2+ after a reaction, wherein the As2S3 and the CdS are filtered to reclaim the arsenic, cadmium and other metal sulfides; the filtrate without slag is led into a lime neutralization and aeration for neutralization and aeration; pH value is adjusted; the treated water is discharged after a standard is met. The method and the device for reclaiming and treating wastewater with high acidity, high arsenic and high cadmium has the advantages that a sulfuration reaction of the wastewater is carried out according to chemical amount; consumption of vulcanizing agent is little; the best sulfuration effect is attained with the lowest medicine consumption; the reclaiming rate of the arsenic is close to 100 percent; the reclaiming rate of the cadmium is over 99.7 percent; the arsenic content in sulfuration slag is high, thus beneficial to a deep processing and utilization of the arsenic and changing harm to advantages; reclamation and commercialization of the arsenic are realized; water is discharged after reaching the standard.

Description

technical field [0001] The invention relates to a method for recovering arsenic and cadmium in polluted acid. Background technique [0002] Arsenic is a carcinogen that is toxic to the human body and other organisms, and its fatal dose of acute poisoning is 0.2-0.6g. Most of the arsenic in nature is often associated with non-ferrous metal ore, and enters the smelting system with the concentrate. Arsenic enters the flue gas, waste water and waste residue in the state of sulfide or salt in the smelting process of non-ferrous metals, and in the process of using flue gas to make acid, they are transferred to the "dirty acid" of washing flue gas . Effective recovery of arsenic and toxic heavy metals including cadmium in polluted acid actually chokes the most important source of pollution in non-ferrous smelting. How to treat the polluted acid containing arsenic and cadmium produced in the non-ferrous metallurgical industry, make it discharge up to the standard and comprehensiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/58
Inventor 易求实杜冬云鲍霞杰曹龙文李敦顺
Owner 大冶有色金属集团控股有限公司