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Preparation and application of zinc-copper alloy electroplating sludge dehydration stabilizer

A technology for electroplating sludge and zinc-copper alloy, which is used in water/sludge/sewage treatment, metallurgical wastewater treatment, dehydration/drying/concentrated sludge treatment, etc. problems, to achieve the effect of simple preparation process, avoiding safety and environmental risk problems

Inactive Publication Date: 2015-03-04
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the high moisture content of the current zinc-copper alloy electroplating sludge and the large amount of Zn in the dehydration process. 2+ 、Cu 2+ Dissolution and loss in wastewater bring secondary difficult problems. A new type of zinc-copper alloy electroplating sludge dehydration stabilizer is proposed and its application method is proposed.

Method used

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  • Preparation and application of zinc-copper alloy electroplating sludge dehydration stabilizer
  • Preparation and application of zinc-copper alloy electroplating sludge dehydration stabilizer
  • Preparation and application of zinc-copper alloy electroplating sludge dehydration stabilizer

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preparation example Construction

[0027] The invention provides a preparation method of a zinc-copper alloy electroplating sludge dehydration stabilizer. Add 59.00kg-110.00kg tetramethylethylenediamine and 120.00kg-220.00kg ultrapure water into the reaction kettle, raise the temperature to 28°C, and start Stir with a stirrer at a stirring speed of 300r / min; add 30.00kg-50.00kg of potassium hydroxide, and after the solution becomes colorless and transparent, slowly add 65.00kg-135.00kg of carbon disulfide, finish adding within 0.5h, and raise the temperature to 44°C , reflux reaction for 6h, the obtained yellow, viscous liquid is the zinc-copper alloy electroplating sludge dehydration stabilizer product of the present invention.

[0028] Add the prepared stabilizer solution to the undehydrated electroplating sludge by using a metering pump, mix and stir for 25-30 minutes, and then perform centrifugal dehydration. With Zn 2+ 、Cu 2+ As the main research object, when the dosage is 8-10kg / m 3 , after centrifugal...

Embodiment 1

[0031] Add 110.00kg of tetramethylethylenediamine and 220.00kg of ultrapure water into the reaction kettle, raise the temperature to 28°C, start the agitator to stir at a stirring speed of 300r / min; add 50.00kg of potassium hydroxide until the solution is colorless After being transparent, slowly add 135.00kg of carbon disulfide, finish adding within 0.5h, heat up to 44°C, and reflux for 6h, the obtained yellow, viscous liquid is the zinc-copper alloy electroplating sludge dehydration stabilizer product of the present invention .

[0032] The prepared stabilizer solution was added to the non-dehydrated electroplating sludge with a metering pump, and after mixing and stirring for 25 minutes, centrifugal dehydration was performed. With Zn 2+ 、Cu 2+ As the main research object, when the dosage is 8kg / m 3 , after centrifugal dehydration at 2000r / min, Zn 2+ 、Cu 2+ The stability rates were 70.69% and 90.80%, respectively.

Embodiment 2

[0034] Add 59.00kg of tetramethylethylenediamine and 120.00kg of ultrapure water to the reaction kettle, raise the temperature to 28°C, start the agitator to stir at a stirring speed of 300r / min; add 30.00kg of potassium hydroxide, until the solution is colorless After being transparent, slowly add 65.00kg of carbon disulfide, finish adding within 0.5h, raise the temperature to 44°C, and reflux for 6h, the obtained yellow, viscous liquid is the zinc-copper alloy electroplating sludge dehydration stabilizer product of the present invention .

[0035] The prepared stabilizer solution was added to the non-dehydrated electroplating sludge by a metering pump, and after mixing and stirring for 30 minutes, centrifugal dehydration was performed. With Zn 2+ 、Cu 2+ As the main research object, when the dosage is 10kg / m 3 , after centrifugal dehydration at 2300r / min, Zn 2+ 、Cu 2+ The stability rates were 77.92% and 95.77%, respectively.

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Abstract

The invention discloses preparation and application of a zinc-copper alloy electroplating sludge dehydration stabilizer. According to the preparation method, the stabilizer for Zn<2+> and Cu<2+> ions in the electroplating sludge dehydration process is prepared through an S<-> and K<+> replacement reaction by taking tetramethylethylenediamine as a raw material, taking potassium hydroxide as an initiator, taking carbon disulfide as an additive, taking ultrapure water as a solvent. With adoption of the prepared dehydration stabilizer, the current problems that the zinc-copper alloy electroplating sludge is high in moisture content and secondary pollution is caused due to dissolution of lots of heavy metal ions in the dehydration process can be solved, and the preparation method the advantages that the preparation process is simple, high-temperature and high-pressure requirements in the reaction kettle are avoided, and emission of the three wastes is avoided. When the addition amount of the dehydration stabilizer is larger than 8kg / m<3>, the stabilization rates of Zn<2+> and Cu<2+> are respectively higher than 70.69 percent and 90.80 percent.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to the preparation and application of a zinc-copper alloy electroplating sludge dehydration stabilizer. Background technique [0002] Zn in the dewatering process of zinc-copper alloy electroplating sludge 2+ 、Cu 2+ To solve the problem of ion dissolution, a preparation and application method of a zinc-copper alloy sludge dewatering stabilizer was proposed. Zinc-copper alloy electroplating wastewater is treated with physical and chemical methods, and the sludge moisture content is above 90%. Vacuum filtration, plate and frame filter press or centrifugal dehydration are usually used to reduce the sludge moisture content from above 90% to 60% respectively. %-80%, 45%-80%, 65%-80%, but these dehydration methods all have a large amount of heavy metal ions flowing into the filtrate due to mechanical force, resulting in that although the sludge has been dehydrated, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCC02F11/14C02F2103/16C02F2303/06
Inventor 张文艺刘芳钱栋胡跃平彭明国
Owner CHANGZHOU UNIV