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Hypophosphite treatment reactor for realizing iodine recycling, and facility and method thereof

A technology for hypophosphite and treatment facilities, which is applied in chemical instruments and methods, filtration treatment, metallurgical wastewater treatment, etc., and can solve the problems of incomplete oxidation of hypophosphite and high treatment costs

Active Publication Date: 2021-04-30
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, phosphite can also react with calcium ions or iron ions to form precipitates and remove them. However, the existing hypophosphite oxidation processes directly oxidize it to orthophosphate. There is no selectivity in the oxidation process, and the treatment cost is high. Incomplete oxidation of phosphate

Method used

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  • Hypophosphite treatment reactor for realizing iodine recycling, and facility and method thereof
  • Hypophosphite treatment reactor for realizing iodine recycling, and facility and method thereof
  • Hypophosphite treatment reactor for realizing iodine recycling, and facility and method thereof

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preparation example Construction

[0038] The preparation method of the activated carbon particles that adsorb iodine elemental substance in the present invention is as follows:

[0039] The iodine element is configured into an iodine solution with a concentration of c, and added with a volume of V 1 , in granular activated carbon with a particle size of 0.5-1 cm, stirring and mixing until the supernatant has no free iodine element, stirring for 2-5 hours, and filtering to obtain activated carbon particles that adsorb iodine element;

[0040] Volume V of activated carbon particles 1 It is calculated by the following formula,

[0041] m 2 =Q×c′×T

[0042]

[0043] V 1 =m 1 / ρ

[0044] where m 2 is the mass of hypophosphite (measured in P) in the waste liquid, in mg; Q is the influent flow, in m 3 / h; c' is the concentration of hypophosphite (calculated as P) in the waste liquid, the unit is mg / m 3 ; T is the running time of the reactor, the unit is h; m 1 is the mass of activated carbon particles, t...

Embodiment

[0056] In this embodiment, the device and method of the present invention are used to treat the electroless nickel plating waste liquid collected separately in a sewage treatment plant in an electroplating park. Among them, the daily treated water volume is 40t, the hypophosphite content is 480mg / L, and the operation time of the device is 12h / d.

[0057] The electroless nickel plating waste liquid to be treated is first pre-treated by the coagulation air flotation unit and the sand filter unit to intercept and remove the impurities and macromolecular organic matter in the waste liquid, and then adjust the pH value in the dosing unit and then mix with hydrogen peroxide. mixed to obtain pretreated wastewater. The pretreated wastewater is passed into the reaction unit.

[0058] The reaction units are set as two groups of parallel operation. Each group of reaction units is provided with three reactors in series, each with a diameter of 1m. The reaction zone is uniformly filled wi...

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Abstract

The invention discloses a hypophosphite treatment reactor for realizing iodine recycling as well as a facility and a method thereof. An intercepting device and an intercepting support plate of the reactor divide an inner cavity into a water inlet area, a reaction area and a water outlet area along the axial direction; the middle lower part of the reaction area is filled with activated carbon particles for adsorbing elemental iodine to form a reaction bed, and a plurality of vertical air pipes are also arranged in the reaction area; and an air compressor can introduce air into the air pipes through an air inlet pipe, so that negative pressure is formed near the air inlets in the bottom end of the air pipes, and waste liquid and activated carbon particles near the air inlets are pumped into the air pipes under the pressure difference, ascend to the air outlets in the top ends to overflow and fall back to the reaction bed under the action of gravity. According to the invention, the air compressor is started regularly, so that the activated carbon particles losing elemental iodine at the lower part of the reaction bed are turned over to the upper part to re-adsorb elemental iodine, thereby avoiding loss caused by separation of elemental iodine from the reaction bed in the water flow migration process.

Description

technical field [0001] The invention belongs to the field of complex heavy metal wastewater treatment, and in particular relates to a hypophosphite treatment reactor for realizing iodine recycling and its facility and method. Background technique [0002] Electroless nickel plating solution is mainly composed of nickel salt, complexing agent, reducing agent and additives. Nickel salt is the main salt of the plating solution. Nickel sulfate is generally used, followed by nickel chloride, and nickel acetate and nickel carbonate. At the same time, it can prevent the precipitation of hydroxide and phosphite; sodium hypophosphite is generally used as the reducing agent, and its function is to provide active hydrogen atoms through catalytic dehydrogenation, and reduce nickel ions to metallic nickel. [0003] The huge electroless plating industry not only promotes the rapid development of modern industry, but also brings serious environmental pollution problems. Periodically scrap...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F103/16
CPCC02F9/00C02F1/24C02F2103/16C02F1/52C02F1/001C02F1/66C02F2101/105C02F1/766Y02P10/20
Inventor 金素素许海亮余华东杨佳朱斌来黄金调刘国庆
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
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