A method for recovering elemental phosphorus from hypophosphite wastewater

A technology of hypophosphite and recovery sheet, which is applied in the direction of phosphorus preparation, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of low utilization rate, low recovery rate of hypophosphite, difficult recovery of hypophosphite, etc., to achieve The effect of high recovery rate, reduction of secondary pollution, and relief of pollution control pressure

Active Publication Date: 2020-04-28
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for recovering elemental phosphorus from hypophosphite wastewater to solve the problem of low recovery rate of hypophosphite in the prior art due to difficulty in recovery of hypophosphite and low utilization rate of medicaments.

Method used

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  • A method for recovering elemental phosphorus from hypophosphite wastewater
  • A method for recovering elemental phosphorus from hypophosphite wastewater
  • A method for recovering elemental phosphorus from hypophosphite wastewater

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0048] The method for recovering elemental phosphorus from hypophosphite wastewater provided by the embodiments of the present invention includes:

[0049] S101: Construct a photoelectrocatalytic reaction system, in which graphite is used as the anode plate 2, Pd / g-C 3 N 4 The electrode is the cathode plate 3, the xenon lamp is the light source 5, and the Nafion proton exchange membrane 6 isolates the device corresponding to the photocatalytic reaction system into an anode chamber and a cathode chamber, and the volume ratio of the anode chamber and the cathode chamber is 1:5;

[0050] S102: adjust the plate spacing between the anode plate and the cathode plate to be 2 cm, and insert the pH meter 7 into a device corresponding to the photocatalytic reaction system;

[0051] S103: Pump the ammonium citrate, sodium sulfate, and hypophosphite wastewater in the raw material pool 12 into the cathode chamber through the metering pump 10, and control the pH value of the hypophosphite ...

Embodiment 2

[0064] The method for recovering elemental phosphorus from hypophosphite wastewater provided by the embodiments of the present invention includes:

[0065] S201: Construct a photoelectrocatalytic reaction system, in which stainless steel is used as the anode plate 2, Pd / g-C 3 N 4 The electrode is the cathode plate 3, the fluorescent lamp is the light source 5, and the Nafion proton exchange membrane 6 isolates the device corresponding to the photocatalytic reaction system into an anode chamber and a cathode chamber, and the volume ratio of the anode chamber and the cathode chamber is 1:5;

[0066] S202: Adjust the plate spacing between the anode plate and the cathode plate to 1 cm, and insert the pH meter 7 into a device corresponding to the photocatalytic reaction system;

[0067] S203: Pump the ammonium citrate, sodium sulfate, and hypophosphite wastewater in the raw material pool 12 into the cathode chamber through the metering pump 10, and control the pH value of the hypo...

Embodiment 3

[0080] The method for recovering elemental phosphorus from hypophosphite wastewater provided by the embodiments of the present invention includes:

[0081] S301: Construct a photoelectric catalytic reaction system, in which graphite is used as the anode plate 2, Pd / g-C 3 N 4 The electrode is the cathode plate 3, the sunlight is the light source 5, and the Nafion proton exchange membrane 6 isolates the device corresponding to the photocatalytic reaction system into an anode chamber and a cathode chamber, and the volume ratio of the anode chamber and the cathode chamber is 1:5;

[0082] S302: adjust the plate spacing between the anode plate and the cathode plate to be 10 cm, and insert the pH meter 7 into the device corresponding to the photocatalytic reaction system;

[0083] S303: Pump the ammonium citrate, sodium sulfate, and hypophosphite wastewater in the raw material pool 12 into the cathode chamber through the metering pump 10, and control the pH value of the hypophosphi...

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Abstract

The invention provides a method for recovering simple substance phosphorus from hypophosphite wastewater. According to the method, a Pd / g-C3N4 electrode is taken as a cathode for establishing a photoelectrocatalysis reaction system, a photoelectric synergistic effect is utilized for enhancing electron migration and improving generation amount of active hydrogen, hypophosphite radicals are catalytically reduced at the cathode, and a reduction product in the form of simple substance phosphorus is recovered from the hypophosphite wastewater. The method provided by the invention is capable of obtaining a recovery product with a high phosphorus yield up to 70% or more. The reduction product exists in the form of simple substance phosphorus, so that a large amount of chemical pollution is avoided and secondary pollution is reduced, and also the reduction product does not contain heavy metals or other impurities and can be directly applied to processing and utilization of phosphorus-containing products. The Pd / g-C3N4 electrode has stable performance and is reusable, so the method does not need a large amount of an agent during recovery of simple substance phosphorus, the usage amount of the agent is reduced and the usage rate of the agent is improved. The provided method is simple to operate and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of recovering elemental phosphorus from wastewater, in particular to a method for recovering elemental phosphorus from hypophosphite wastewater. Background technique [0002] In recent years, with the development of industry, surface treatment industries such as electroplating and chemical plating have developed rapidly. Hypophosphite is widely used in surface treatment due to its low toxicity and strong reducibility. Due to the development of the surface treatment industry, more than 400 million cubic meters of wastewater from plating tanks are produced every year. In the large amount of plating tank wastewater produced, the concentration of total phosphorus is relatively high, which can reach 3000mg / L. At present, the treatment of plating tank wastewater focuses on the treatment of heavy metals and toxic anions, and the treatment of hypophosphite is less. [0003] The traditional treatment method of hypo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/30C25B1/00C01B25/02C02F101/10C02F103/16
CPCC01B25/02C02F1/30C02F1/46109C02F1/4676C02F2001/46133C02F2101/105C02F2103/16C02F2201/46115C02F2201/4618C02F2305/10C25B1/55
Inventor 关伟谢志刚杨俊王维勋
Owner CHONGQING UNIV OF ARTS & SCI
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