Device and process for safely treating aluminum phosphide fumigating residues

Abstract

The invention discloses a device and process for safely treating aluminum phosphide fumigating residues. The process comprises the steps that firstly, inert gas is introduced into a hydrolyzing and absorbing tank, air in the hydrolyzing and absorbing tank is discharged, then water is injected into the hydrolyzing and absorbing tank, then a hydrolyzing agent, the aluminum phosphide fumigating residues and a site absorption agent are sequentially added to the hydrolyzing and absorbing tank, and absorption liquid is sprayed for absorption in an exhaust absorption device; and secondly, reaction liquid generated after a hydrolyzing reaction is conducted is discharged and filtered, filter residues are neutralized and buried safely, filter liquid returns to the hydrolyzing and absorbing tank to replace the water added to the hydrolyzing and absorbing tank in the first step, residual liquid is absorbed by exhaust to complement the insufficient part, and raw materials are added for a next reaction. According to the device and process, the hydrolyzing reaction is performed in the hydrolyzing and absorbing tank, exhaust absorption comprises site absorption in the hydrolyzing and absorbing tank and further absorption in a two-stage exhaust absorption tower, and the residual liquid absorbed by exhaust can be reused for hydrolyzing agent preparation.

Description

technical field [0001] The invention discloses a safe treatment device and process for aluminum phosphide fumigation residues, belongs to the field of hazardous waste treatment and disposal, and is suitable for safe treatment and disposal of aluminum phosphide residues of different scales. Background technique [0002] Aluminum phosphide is a fumigant widely used in the process of grain storage and transshipment at home and abroad. With the development of my country's grain industry and the prosperity of import and export grain trade, the amount of aluminum phosphide fumigation residue produced in the fumigation process is increasing day by day. At the same time, due to differences in fumigation methods, temperature, time, etc., the residual amount of aluminum phosphide in these fumigation residues varies, usually containing more than 3% aluminum phosphide, but sometimes the residual amount of aluminum phosphide will reach 15%- 35%, such as in the long-distance shipping of ...

AI Technical Summary

Problems solved by technology

25%-75% sodium chlorite absorption solution decomposes itself during the storage and transportation process, the concentration of available chlorine decreases, the absorption efficiency drops rapidly, and the absorption effect is poor. The protective gas introduced will increase the gas flow rate and reduce the mass transfer efficiency. Reduce the absorption effect of the absorption liquid on phosphine, and there will be a large amount of phosphine gas in the total exhaust gas discharge. In addition, the hydrolysis agent hydrochloric acid has strong volatility, low utilization rate, and secondary damage to the environment. serious pollution

Although aluminum phosphide can be disposed of in a harmless manner in this method, the toxic gas phosphine produced cannot be controlled, and the construction of a special incineration device in this method requires a high one-time input cost, and due to the aluminum phosphide residue produced in each region Limited, the engineering application is more difficult, and at the same time, the safety hazards in the transportation of aluminum phosphide residues cannot be avoided

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