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Method for preparing polyferric chloride flocculant by using steel wire rope sludge and waste hydrochloric acid

A technology for polymerizing ferric chloride and waste hydrochloric acid, which is applied in the fields of ferric halide, flocculation/sedimentation water/sewage treatment, etc., and can solve the problems of innocuous treatment and resource utilization of steel wire rope pickling sludge and waste hydrochloric acid, etc. To achieve the effect of excellent purification performance

Active Publication Date: 2017-11-21
刘阳生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"This patented technology simply mixes and dissolves waste hydrochloric acid and sludge. The heavy metal ion lead rich in steel wire rope pickling sludge and waste hydrochloric acid is not eliminated. Therefore, the final product obtained by this invention patent is rich in heavy metals. The strong acid waste liquid of ionic lead, according to the national hazardous waste identification standard, the strong acid waste liquid is still a hazardous waste and must be discharged to meet the standard after further detoxification and advanced treatment. Harmless treatment and resource utilization

Method used

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  • Method for preparing polyferric chloride flocculant by using steel wire rope sludge and waste hydrochloric acid

Examples

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Effect test

Embodiment 1

[0028] see figure 1, put 2000L waste hydrochloric acid (the mass concentration of hydrochloric acid is 13%, the mass concentration of lead ion is 1620 ppm, the mass concentration of iron ion is 9.7%) into the extraction reaction tank 2, add 1000kg of wire rope pickling sludge (moisture content 76.8 %, the mass concentration of iron ions is 10.8%, the mass concentration of lead ions is 2000 ppm) 1, stirred and reacted for 30 minutes, after the plate and frame filter press 3 removes the sludge residue 4, the filtrate enters the lead removal reaction tank 5, Gradually add 260 L of sodium sulfide solution 6 with a mass concentration of 17%, continue to stir and react for 30 minutes after the dropwise addition, discharge to the static precipitation tank 7, and leave it for 2 hours, then pump the supernatant into ferric chloride The solution storage tank 8 and the bottom sludge 9 of the sedimentation tank are filtered by a plate and frame filter press 10 to obtain a lead sulfide mud...

Embodiment 2

[0032] see figure 1 , put 2000L waste hydrochloric acid (the mass concentration of hydrochloric acid is 5%, the mass concentration of lead ion is 320ppm, the mass concentration of iron ion is 9%) into the extraction reaction tank 2, add 1000kg steel wire rope pickling sludge (moisture content 80% , the mass concentration of iron ions is 11.5%, and the mass concentration of lead ions is 2300 ppm) 1, stirred and reacted for 50 minutes, after the plate and frame filter press 3 removes the sludge residue 4, the filtrate enters the deleading reaction tank 5, gradually Add dropwise 230 L of potassium sulfide solution 6 with a mass concentration of 10%, continue to stir and react for 45 minutes after the dropwise addition, discharge the material to the static precipitation tank 7, and leave it for 3 hours, then pump the supernatant into the ferric chloride solution Storage tank 8 and sedimentation tank bottom sludge 9 are filtered by plate and frame filter press 10 to obtain lead sul...

Embodiment 3

[0035] Example 3: Example of use

[0036] The polyferric chloride flocculant prepared in Example 1 was used for domestic sewage treatment. at 1 m 3 Add 1.5 kg of polyferric chloride flocculant to the domestic sewage, stir for 5 minutes, let it settle for 30 minutes, and take samples to test the treatment effect of domestic sewage. Before treatment, domestic sewage turbidity 240.6 NTU, COD Cr 656.6 mg / L, ammonia nitrogen 30.9 mg / L, total phosphorus 3.6 mg / L, after treatment, turbidity decreased by 97%, COD Cr , ammonia nitrogen and total phosphorus removal rates were 79.5%, 81.2% and 81%.

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Abstract

The invention discloses a method for preparing a polyferric chloride flocculant by using steel wire rope sludge and waste salt. According to the method, the steel wire rope pickling sludge is dissolved in waste hydrochloric acid, lead ions in the dissolved solution are removed with a sulfide precipitation method, and the polyferric chloride flocculant is obtained; produced hydrogen sulfide gas meets the national odor pollutant emission standard after being subjected to falling-film absorption, packed tower absorption and activated carbon adsorption treatment, and meanwhile, whole-process sulfur element recycling is realized; cement is added to sludge residues for curing, and heavy metals are cured and stabilized. With the adoption of the method, the recovery rate of iron in the sludge is higher than 90%, the produced polyferric chloride flocculant has excellent performance in purification of domestic sewage, and produced lead sulfide meets the industrial purity requirement and can be used as an industrial raw material. With the adoption of the method, harmless disposal and resource utilization of the steel wire rope pickling sludge and the waste hydrochloric acid are realized simultaneously.

Description

technical field [0001] The invention belongs to the field of harmless treatment and resource utilization of chemical waste, and relates to a method for preparing polyferric chloride flocculant by using steel wire rope sludge and waste hydrochloric acid. Background technique [0002] A large amount of acidic wastewater is produced in the production process of steel wire rope, mainly from the pickling and phosphating production process, which contains a large amount of heavy metal elements, such as iron, lead and zinc, etc. The wastewater treatment method mainly adopts the hydroxide precipitation method. Use lime milk or sodium hydroxide as an alkaline precipitant, add wastewater, and through neutralization, heavy metals will form insoluble hydroxides to precipitate and separate. The precipitates formed are steel wire rope pickling sludge. Disposal after plate and frame filtration. [0003] According to the survey, 1 ton of wastewater after treatment produces about 0.02 tons ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/10C02F1/52
Inventor 刘阳生施荣标
Owner 刘阳生
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