Method and device for recovering and purifying phosphorus from sludge incineration ash

A technology of sludge incineration and electrochemistry, applied in chemical instruments and methods, phosphoric acid, inorganic chemistry, etc., can solve the problems that hinder the industrial application of the process, complex phosphorus recovery equipment, harsh reaction conditions, etc., and achieve good industrial application prospects and realize The effect of high concentration enrichment and efficient recovery

Active Publication Date: 2022-03-01
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for recovering and purifying phosphorus from sludge incineration ash, so as to solve the problems of harsh reaction conditions, low purity of phosphorus, and difficulty in recovering phosphorus from existing methods for recovering phosphorus from sludge incineration ash. Complex equipment and other problems that hinder the industrial application of the process

Method used

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  • Method and device for recovering and purifying phosphorus from sludge incineration ash
  • Method and device for recovering and purifying phosphorus from sludge incineration ash
  • Method and device for recovering and purifying phosphorus from sludge incineration ash

Examples

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Embodiment 1

[0042] A device for recovering high-purity phosphorus from sludge incineration ash, combined with figure 1 and figure 2 shown, including:

[0043] A potentiostat 1 for providing a stable current;

[0044] anode 2 and cathode 3;

[0045] An anode reaction cell 4 equipped with anolyte, in which an anode 2 is inserted, the anode reaction cell 4 is a detachable reaction cell;

[0046] A cathode reaction tank 5 equipped with catholyte, a cathode 3 is inserted in the cathode reaction tank 5, and the cathode reaction tank 5 is a detachable reaction tank;

[0047] Cation exchange membrane 6: the cation exchange membrane 6 is detachably arranged between the anode reaction pool 4 and the cathode reaction pool 5, on the one hand the anode reaction pool 4 and the cathode reaction pool 5 are separated by the cation exchange membrane 6, on the other hand it can The detachable installation method is also convenient for the replacement of the cation exchange membrane 6; specifically, the...

Embodiment 2

[0052] This embodiment provides a method for recovering and purifying phosphorus from sludge incineration ash, comprising the following steps:

[0053] Acid extraction: use a sulfuric acid solution with a concentration of 1moL / L as the acid agent, pickle the sludge incineration ash for 24 hours, the solid-liquid ratio of the sludge incineration ash to the sulfuric acid solution is 1:5g / mL, filter with a filter membrane after pickling Remove the insoluble solids to obtain an acid extract, which contains phosphate ions and various metal ions, and the metal ions include calcium ions, magnesium ions, aluminum ions, iron ions, copper ions, zinc ions, manganese ions, and lead ions , nickel ions, cadmium ions.

[0054] Electrochemical purification: use the filtered acid extract as the anolyte, 0.01moL / L sodium nitrate solution as the catholyte, and make the volumes of the anolyte and catholyte the same to ensure the same hydraulic pressure. 2 The platinum sheet electrodes are the an...

Embodiment 3

[0060] This embodiment provides a method for recovering and purifying phosphorus from sludge incineration ash, comprising the following steps:

[0061] Acid extraction: Use a sulfuric acid solution with a concentration of 0.2moL / L as the acid agent, pickle the sludge incineration ash for 4 hours, the solid-liquid ratio of the sludge incineration ash to the sulfuric acid solution is 1:20g / mL, use a filter membrane after pickling The insoluble solid is filtered off to obtain an acid extract, which contains phosphate ions and various metal ions.

[0062] Electrochemical purification: use the filtered acid extract as the anolyte, 0.01moL / L sodium nitrate solution as the catholyte, and make the volumes of the anolyte and catholyte the same to ensure the same hydraulic pressure. 2 The platinum sheet electrodes are the anode and the cathode, and a cation exchange membrane is set between the anolyte and the catholyte, and the electrochemical reaction is performed at a constant current...

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Abstract

The invention relates to the technical field of environmental protection and resource recovery, in particular to a method and device for recovering and purifying phosphorus from sludge incineration ash. The method comprises the following steps: acid extraction, pickling the sludge incineration ash, and filtering to obtain an acid extract; electrochemical purification, using the acid extract as an anolyte, a salt solution containing nitrate as a catholyte, and an inert electrode It is an anode and a cathode, and a cation exchange membrane is arranged between the anolyte and the catholyte to carry out an electrochemical reaction, and the anolyte after the electrochemical reaction is a solution of purified phosphate radicals. The method can realize high-efficiency recovery and high-level purification of phosphorus in sludge incineration ash, has strong operability, and has good industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource recovery, in particular to a method and device for recovering and purifying phosphorus from sludge incineration ash. Background technique [0002] With the acceleration of modernization and urbanization, my country has to deal with a large amount of wastewater every year, accompanied by a large amount of urban sludge. The main treatment method of municipal sludge is incineration. The sludge incineration technology can effectively realize the demand for sludge reduction, greatly reduce the pressure on the landfill area, and reduce the volume of sludge by about 80%. The sludge incineration ash formed after sludge incineration is a major phosphorus-containing waste, but in addition to about 10% of P in the sludge incineration ash 2 o 5 In addition, it also contains a large number of metal compounds, which prevent the sludge incineration ash from being directly used as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/222C01B25/22
CPCC01B25/222C01B25/2208C01B25/2212C01B25/2216
Inventor 张作泰方乐颜枫
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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