Solid material for treating cyanide cadmium plating wastewater and preparation method and application thereof

A technology of solid materials and production methods, applied in chemical instruments and methods, water/sewage treatment, cation exchange materials, etc., can solve the problems of less application, high treatment cost, and large amount of chemicals used, and achieve green and efficient processes, reduce Effect of production pressure and reduction of processing cost

Active Publication Date: 2020-05-05
NANJING YUANQUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical method is a commonly used cyanide cadmium plating rinse water treatment method. NaClO is mainly used for secondary cyanide breaking treatment. This method consumes a lot of chemicals and has high treatment costs.
The electrolysis method has a good effect of breaking the network, but the treatment cost is high, and additional chemicals need to be added to increase the conductivity of the electrolyte, and a large amount of hydrogen and oxygen are easily produced during the electrolysis process, which poses a safety hazard
The ion exchange resin method is widely used in the wastewater treatment industry because of its strong anion and cation exchange functions. However, due to the poor tolerance of ion exchange resins to organic matter, it is less used in the treatment of cyanide cadmium plating wastewater.

Method used

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  • Solid material for treating cyanide cadmium plating wastewater and preparation method and application thereof
  • Solid material for treating cyanide cadmium plating wastewater and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step (1), 0.1kg perfluoroacyl peroxide (FO 2 SCF 2 CF 2 OCF(CF 3 )COF), 0.2t of tetrafluoroethylene and 0.5t of perfluoro[2-(2-fluorosulfonylethoxy)-propyl vinyl ether] were added to the reaction kettle in sequence, and the reaction was stirred at 70°C for 24h, Stirring rate 400r / min; after the reaction is finished, add the solution to 3t sodium hydroxide aqueous solution (mass fraction of 30%) while it is hot, and continue to stir for 24h at a stirring rate of 400r / min, and uniform particles will be precipitated during soaking; filter, The particles are washed with distilled water to neutrality, that is, they contain -SO 2 Na group sodium perfluorosulfonate resin (F ion is less than 0.05%), spare;

[0035] Step (2), 200kg coconut shell activated carbon (200 mesh) is immersed in 0.4t ammonia water (mass fraction 30%), stirred and washed for 1h, filtered, and the particles are washed with distilled water until the filtrate is neutral; the solid is added to 0.5t hydrochloric ...

Embodiment 2

[0045] Step (1), 0.2kg perfluoroacyl peroxide (FO 2 SCF 2 CF 2 OCF(CF 3 )COF), 0.5t of tetrafluoroethylene and 0.2t of perfluoro[2-(2-fluorosulfonylethoxy)-propyl vinyl ether] were added to the reaction kettle in sequence, and the reaction was stirred at a temperature of 80°C for 12h, Stirring rate 400r / min; after the reaction is finished, add the solution to 3t sodium hydroxide aqueous solution (mass fraction 30%) while it is hot, and continue to stir for 20h at a stirring rate of 400r / min, uniform particles will be precipitated during the soaking process; filter , The particles are washed with distilled water to neutrality, that is, they contain -SO 2 Na group sodium perfluorosulfonate resin (F ion is less than 0.05%), spare;

[0046] Step (2), immerse 250kg coconut shell activated carbon (150 mesh) in 0.6t ammonia water (mass fraction 20%), stir and wash for 1.5h, filter, and wash the particles with distilled water until the filtrate is neutral; add the solid to 0.7t Wash in h...

Embodiment 3

[0053] Step (1), 0.3kg perfluoroacyl peroxide (FO 2 SCF 2 CF 2 OCF(CF 3 )COF), 0.5t of tetrafluoroethylene and 0.5t of perfluoro[2-(2-fluorosulfonylethoxy)-propyl vinyl ether] were added to the reaction kettle in sequence, and the reaction was stirred at a temperature of 80°C for 24h, Stirring rate 600r / min; after the reaction is finished, add the solution to 5t sodium hydroxide aqueous solution (mass fraction of 30%) while it is hot, and continue to stir for 48h at a stirring rate of 600r / min, uniform particles will be precipitated during the immersion process; filtered, particles Wash with distilled water to neutral, that is, it contains -SO 2 Na group sodium perfluorosulfonate resin (F ion is less than 0.05%), spare;

[0054] Step (2), immerse 300 kg of coconut shell activated carbon (200 mesh) in 0.8t ammonia water (mass fraction 10%), stir and wash for 2h, filter, and wash the particles with distilled water until the filtrate is neutral; add the solid to 1t hydrochloric acid ...

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Abstract

The invention discloses a solid material for treating cyanide cadmium plating wastewater. The solid material is prepared by adopting a method comprising the following steps: adopting perfluoroacyl peroxide as an initiator, copolymerizing tetrafluoroethylene and perfluoro[2-(2-fluorosulfonylethoxy)-propyl vinyl ether] to obtain perfluorosulfonic acid precursor resin, and then converting the perfluorosulfonic acid precursor resin by virtue of a sodium hydroxide solution to obtain sodium perfluorosulfonate resin containing -SO2Na groups; respectively cleaning the activated carbon powder with ammonia water and hydrochloric acid to obtain an activated carbon carrier; reacting butyl titanate, nitric acid, ammonia water and ammonium sulfate in an aqueous solution, roasting and crushing to obtaina nitrogen-doped TiO2 solid; and carrying out high-temperature treatment on the sodium perfluorosulfonate resin, the activated carbon carrier and the nitrogen-doped TiO2 solid, and granulating by using a granulator to obtain the solid material. The solid material provided by the invention integrates three effects of complex breaking, ion exchange and catalytic oxidation and can effectively treat cadmium cyanide pollutants in cyanide cadmium plating wastewater, and the removal rate of cadmium and free cyanogens can reach 99.8% or above.

Description

Technical field [0001] The invention belongs to the technical field of industrial electroplating wastewater treatment, and specifically relates to a solid material manufacturing method for treating cyanide cadmium plating wastewater and its application. Background technique [0002] Cyanide cadmium plating is a commonly used anti-corrosion and decoration process for carbon steel and low-alloy steel in military products. The cadmium coating is an anodic coating for steel, and its protective performance is stronger than that of the zinc coating, and it has better protection for steel parts. And because the cyanide cadmium plating solution has a large cathodic polarization, it can make the metal coating smooth and fine, and prepare more excellent metal products. Therefore, the cyanide cadmium plating process is widely used in aviation, navigation and defense industries. However, cyanide is a highly toxic substance with high toxicity, which seriously pollutes the environment and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/20B01J27/24B01J21/06C02F1/00C02F1/28C02F1/42C02F1/72C02F101/20C02F101/18
CPCB01J39/20B01J21/063B01J27/24C02F1/00C02F1/42C02F1/283C02F1/725C02F2001/425C02F2101/18C02F2101/20
Inventor 陈永乐沈德华骆劲松范正芳陈尧李瑞鹏吴冬飞
Owner NANJING YUANQUAN TECH CO LTD
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