Harmless treatment method for aluminum phosphide fumigation residues

A harmless treatment, aluminum phosphide technology, applied in chemical instruments and methods, waste treatment, separation methods, etc., can solve problems such as aluminum phosphide fumigation residue pollution, avoid secondary pollution, reduce risk factors, and solve Effects of pollution problems

Inactive Publication Date: 2012-10-17
DALIAN DONGTAI INDAL WASTE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned disadvantages, provide a method for harmless treatment of aluminum phosphide fumigation residues, perform non-toxic and harmless treatment on aluminum phosphide residues, achieve safety and environmental protection, and completely solve the problem of phosphating Pollution Problems of Aluminum Fumigation Residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for harmless treatment of aluminum phosphide fumigation residues. After mixing aluminum phosphide fumigation powder residues with excess water at 45°C in a closed container, nitrogen 2 gas, pH 3 Same as N 2 Together into the exhaust gas treatment system, PH 3 The gas reacts with sodium hypochlorite solution with an effective chlorine mass percentage concentration of 10% for two absorptions. During the absorption process, a slight negative pressure in the spray tower is guaranteed, and the pressure is -0.005MPa. Finally, the harmless treatment of the tail gas is achieved. Phosphating Hydrogen detector, measuring the concentration of phosphine gas is less than 0.03mg / m 3 ; The residue after treatment is used as raw material for cement production and sent to the cement plant for comprehensive utilization.

Embodiment 2

[0018] A method for harmless treatment of aluminum phosphide fumigation residues. After mixing aluminum phosphide fumigation powder residues with excess water at 55°C in a closed container, nitrogen 2 gas, pH 3 Same as N 2 Together into the exhaust gas treatment system, PH 3 The gas reacts with 30% mass percent hydrogen peroxide for primary absorption, and then performs secondary absorption with 20% mass percent copper sulfate solution. During the absorption process, a slight negative pressure in the spray tower is guaranteed, with a pressure of -0.05MPa. Finally, the harmless treatment of tail gas is achieved. Using a phosphine detector, the concentration of phosphine gas is measured to be less than 0.03mg / m 3 ; The residue after treatment is used as raw material for cement production and sent to the cement plant for comprehensive utilization.

Embodiment 3

[0020] A method for harmless treatment of aluminum phosphide fumigation residues. After mixing aluminum phosphide fumigation powder residues with excess 60°C water in a closed container, inject CO 2 gas, pH 3 Same as CO 2 Together into the exhaust gas treatment system, PH 3 The gas reacts with 30% mass percent hydrogen peroxide for primary absorption, and then performs secondary absorption with sodium hypochlorite solution with 10% mass percent concentration of available chlorine. During the absorption process, a slight negative pressure in the spray tower is guaranteed, with a pressure of -0.01MPa , and finally achieve the harmless treatment of tail gas, use the phosphine detector to measure the concentration of phosphine gas to be less than 0.03mg / m 3 ; The residue after treatment is used as raw material for cement production and sent to the cement plant for comprehensive utilization.

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Abstract

The invention belongs to a harmless treatment technology for aluminum phosphide fumigation residues, wherein the technology is applicable for harmless treatment of aluminum phosphide fumigation residues in the industry. According to the harmless treatment method for aluminum phosphide fumigation residues, aluminum phosphide fumigation powder residues and excess water are mixed in a closed container; a protection gas is introduced, and a stirring treatment is performed under a certain state, wherein the state is assurance of no air; the generated PH3 gas and the protection gas enter a tail gas absorption device; an oxidizing agent spraying treatment is performed two times to carry out a tail gas absorption treatment, wherein a slight negative pressure state inside a spraying tower is ensured during the spraying process, and the PH3 gas is subjected to a completely harmless treatment; and the treated residues are adopted as a cement production raw material to be conveyed to a cement plant to be comprehensively utilized. The method of the present invention has the following advantages that: the aluminum phosphide fumigation residues are subjected to the harmless treatment while the risk coefficient of the operation is reduced, and the PH3 gas produced in the process is further subjected to the harmless treatment at the same time so as to avoid secondary pollution generation, and completely solve the pollution problem of the aluminum phosphide fumigation residues.

Description

technical field [0001] The invention relates to a method for harmless treatment of aluminum phosphide fumigation residues. Background technique [0002] Aluminum phosphide is a fumigant widely used at home and abroad at present, and the residue after fumigation contains more than 3% of aluminum phosphide that has not been completely decomposed and utilized. When aluminum phosphide encounters moisture in the air, it will produce phosphine gas, phosphorus Hydrogen sulfide is a highly toxic substance, so scientific treatment of aluminum phosphide residues is very important. At present, the treatment of aluminum phosphide residues generally takes two forms: one is to use chemical treatment agents; the other is to find a place far away from the water source and dig a deep burial. Neither of these two methods can completely avoid the volatilization of residual phosphine. Phosphine gas is flammable and explosive, and has great safety hazards in the process of processing. Improper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B01D53/78B01D53/46
CPCY02W30/20
Inventor 高麒麟刘晶蔡钊荣华庆亮肖朋李新磊崔娜
Owner DALIAN DONGTAI INDAL WASTE TREATMENT
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