Preparation method of heavy metal ion stabilizer for dehydrating electroplating sludge

A technology for heavy metal ions and electroplating sludge, which is applied in dewatering/drying/concentrating sludge treatment, metallurgical wastewater treatment and other directions, can solve the problems of secondary treatment of lost filtrate, and achieves a simple preparation process and avoids safety and environmental risks. Effect

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

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Problems solved by technology

[0005] Based on this, the present invention prepares a heavy metal ion stabilizer used in the electroplating sludge dehydration process to overcome the secondary

Method used

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  • Preparation method of heavy metal ion stabilizer for dehydrating electroplating sludge
  • Preparation method of heavy metal ion stabilizer for dehydrating electroplating sludge
  • Preparation method of heavy metal ion stabilizer for dehydrating electroplating sludge

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preparation example Construction

[0029] The invention provides a preparation method of a heavy metal ion stabilizer used for electroplating sludge dehydration, which is to add 59.00kg-118.00kg tetramethylethylenediamine and 112.00kg-224.00kg ultrapure water to the reaction kettle, and raise the temperature to 28°C , start the agitator to stir, the stirring speed is 300r / min; add 28.00kg-56.00kg potassium hydroxide, after the solution is colorless and transparent, slowly add 68.40kg-140.00kg carbon disulfide, add it within 0.5h, and heat up to 44°C, reflux reaction for 6 hours, the obtained yellow, viscous liquid is the dehydration stabilizer product of the present invention.

[0030] Add the prepared stabilizer solution to the undehydrated electroplating sludge by using a metering pump, mix and stir for 25-30 minutes, and perform centrifugal dehydration. When the dosage is 8-10kg / m 3 , after centrifugal dehydration (speed 2000-2500r / min), Cu 2+ 、Ni 2+ , Zn 2+ The ion stability rates were 90.80-95.77%, 91....

Embodiment 1

[0033] Add 80.50kg of tetramethylethylenediamine and 150.00kg 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 38.33kg of potassium hydroxide until the solution is colorless After it becomes transparent, slowly add 90.50kg of carbon disulfide, complete the addition within 0.5h, raise the temperature to 44°C, and reflux for 6h. The obtained yellow, viscous liquid is the dehydration stabilizer product of the present invention.

[0034] Add the prepared stabilizer solution into the undehydrated electroplating sludge by using a metering pump, mix and stir for 30 minutes, and perform centrifugal dehydration. Take Cu 2+ 、Ni 2+ , Zn 2+As the main research object, when the dosage is 9kg / m 3 , after centrifugal dehydration at 2500r / min, Cu 2+ 、Ni 2+ , Zn 2+ The stability rates were 94.81%, 94.92%, and 71.97%, respectively.

Embodiment 2

[0036] Add 118.00kg of tetramethylethylenediamine and 224.00kg of ultrapure water into the reaction kettle, raise the temperature to 28°C, start the stirrer to stir at a stirring speed of 300r / min; add 56.00kg of potassium hydroxide, and wait until the solution is colorless After becoming transparent, slowly add 140.00kg of carbon disulfide dropwise, finish adding within 0.5h, raise the temperature to 44°C, and reflux for 6h. The obtained yellow, viscous liquid is the dehydration stabilizer product of the present invention.

[0037] Add the prepared stabilizer solution into the undehydrated electroplating sludge by using a metering pump, mix and stir for 25 minutes, and perform centrifugal dehydration. Take Cu 2+ 、Ni 2+ As the main research object, when the dosage is 8kg / m 3 , after centrifugal dehydration at 2000r / min, Cu 2+ 、Ni 2+ The stability rates were 90.80% and 91.91%, respectively.

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Abstract

The invention discloses a preparation method of a heavy metal ion stabilizer for dehydrating electroplating sludge. By taking tetramethyl ethylenediamine as a raw material, potassium hydroxide as an initiator, carbon dioxide as an additive and ultrapure water as a solvent, the preparation method is used for preparing the heavy metal ion stabilizer for dehydrating electroplating sludge by virtue of S<-> and k<+> replacement reaction. The stabilizer prepared by the preparation method disclosed by the invention not only can be used for overcoming the problems that the existing electroplating sludge is high in water content, and secondary pollution treatment is caused due to dissolution of a great deal of heavy metal ions in a hydrating process, but also has the advantages of a simple preparation process, no high-temperature high-pressure requirements in a reaction kettle, no emission of three wastes, and the like.

Description

technical field [0001] The invention belongs to sewage treatment technology [0002] field, in particular to a method for preparing a heavy metal ion stabilizer used in the electroplating sludge dehydration process. Background technique [0003] Aiming at the problem of heavy metal ion dissolution in the dehydration process of electroplating sludge, a preparation method of heavy metal ion stabilizer used in the dehydration process of electroplating sludge was proposed. Electroplating sludge is the precipitation product of electroplating wastewater treated by physical and chemical methods. It is enriched with various heavy metals in electroplating wastewater. Its accumulation, loss or direct discharge seriously pollutes soil and groundwater, causing ecological and environmental safety problems, endangering human health and life safety. The first step in the treatment and disposal of electroplating sludge is dehydration to reduce the volume. At present, the moisture content...

Claims

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Application Information

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IPC IPC(8): C07C333/16C02F11/14C02F103/16
Inventor 张文艺刘芳冯国勇李文昱钱栋
Owner CHANGZHOU UNIV
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