CN111135523B - Mild method for treating triethyl aluminum in hazardous waste - Google Patents

Abstract

The invention discloses a mild method for disposing triethyl aluminum in hazardous waste, which comprises the following steps of S1, disintegrating distillation residues containing triethyl aluminum into small blocks; s2, adding one thousandth of oxazine inhibitor into water, and stirring to obtain an aqueous solution containing the oxazine inhibitor; s3, adding the rectification residue decomposed in the step S1 into the aqueous solution containing the oxazine inhibitor prepared in the step S2, and fully hydrolyzing the aqueous solution in water; s4, collecting aluminum hydroxide waste residue, rectification residue aqueous solution and ethane waste gas generated in the hydrolysis process in the step S3; s5, performing centralized treatment on the ethane waste gas by using a tail gas absorption system; the heat values of the aluminum hydroxide waste residue and the rectification residue aqueous solution meet the incineration requirement, and the treatment is directly carried out after the compatibility. According to the invention, by adding the oxazine inhibitor, the temperature can be controlled in the hydrolysis process, and the tail gas can be completely collected and then treated, so that the risk and the secondary environmental pollution in the treatment process can be reduced.

Description

Mild method for treating triethyl aluminum in hazardous waste

Technical Field

The invention relates to a mild method for treating triethyl aluminum in hazardous waste.

Background

The dangerous solid waste is called dangerous waste for short, and is called harmful waste old. May cause or contribute to increased mortality due to their amount, concentration, physical or chemical properties, ease of dissemination; or increased incidence of severe disease; or solid waste that, when properly managed, can pose a significant acute (immediate) or potential hazard to human health or the environment. At present, the domestic and foreign disposal methods for industrial solid hazardous wastes mainly comprise a safe landfill method, wet leaching, rotary kiln incineration and the like.

At present, the treatment of special hazardous wastes such as industrial hazardous wastes is generally carried out by burning the crushed small bags in a separate feeding mode. The disadvantages of this approach are: 1) the daily treatment amount is small, and the treatment is carried out according to the furnace condition every day; 2) the pretreatment is required to be carried out immediately, an exothermic reaction can occur when the pretreatment is met with water, and a large amount of white smoke is generated to cause secondary pollution to the environment; 3) when incinerated, the heat value is high, so that deflagration can cause certain pollution factors in the smoke to exceed the standard, and secondary environmental pollution is caused.

The main hazard source of the special substances is chemical raw material triethyl aluminum which is not completely reacted in the rectification residue, and the physicochemical properties of the triethyl aluminum are as follows: has strong irritation and corrosion effects, and can be decomposed with water or alcohol to produce aluminum hydroxide and triethoxy aluminum. Is inflammable, toxic, has high chemical reaction activity, and can smoke and spontaneously combust when contacting with air. The reaction to trace oxygen and moisture is very sensitive, and the combustion and explosion are easily caused. Contact with acid, halogen, alcohol and amine to produce violent reaction. Therefore, designing a safe, stable and harmless method for disposing waste triethyl aluminum becomes a technical problem to be solved urgently.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a mild method for treating triethyl aluminum in dangerous waste, so that the reaction is mild, and the chemical reaction risk is eliminated.

In order to solve the technical problems, the invention provides the following technical scheme:

the invention discloses a mild method for treating triethyl aluminum in hazardous waste, which comprises the following steps:

s1, disintegrating the rectification residue containing triethyl aluminum into small blocks;

s2, adding one thousandth of oxazine inhibitor into water, and stirring to obtain an aqueous solution containing the oxazine inhibitor;

s3, adding the rectification residue decomposed in the step S1 into the aqueous solution containing the oxazine inhibitor prepared in the step S2, and fully hydrolyzing the aqueous solution in water;

s4, collecting aluminum hydroxide waste residue, rectification residue aqueous solution and ethane waste gas generated in the hydrolysis process in the step S3;

s5, performing centralized treatment on the ethane waste gas by using a tail gas absorption system; the heat values of the aluminum hydroxide waste residue and the rectification residue aqueous solution meet the incineration requirement, and the treatment is directly carried out after the compatibility.

Preferably, the oxazine inhibitor is a diphenylsulfide salt.

The invention has the following beneficial effects:

1) by adding the oxazine inhibitor, the temperature can be controlled in the hydrolysis process, and the tail gas can be completely collected and then treated, so that the risk and the secondary environmental pollution in the treatment process can be reduced;

2) after hydrolysis, the raw materials can be directly mixed, so that the daily treatment amount is increased, the temporary storage amount can be quickly treated, and the temporary storage risk is reduced;

3) the chemical reaction risk is eliminated after hydrolysis, the temporary storage can be safely carried out, and secondary environmental pollution is avoided;

4) and through direct feeding compatibility after hydrolysis, the smoke exceeding caused by deflagration in the incineration disposal process can be avoided, and the secondary pollution to the environment is caused.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.

A mild method for treating triethyl aluminum in hazardous waste comprises the following steps:

s1, disintegrating the rectification residue containing triethyl aluminum into small blocks;

s2, adding one thousandth of oxazine inhibitor into water, and stirring to obtain an aqueous solution containing the oxazine inhibitor;

s3, adding the rectification residue decomposed in the step S1 into the aqueous solution containing the oxazine inhibitor prepared in the step S2, and fully hydrolyzing the aqueous solution in water; after the inhibitor is added, the reaction is mild, the heat release is not severe, and the production accident caused by high-temperature splashing is avoided;

s4, collecting aluminum hydroxide waste residue, rectification residue aqueous solution and ethane waste gas generated in the hydrolysis process in the step S3;

s5, performing centralized treatment on the ethane waste gas by using a tail gas absorption system; the heat values of the aluminum hydroxide waste residue and the rectification residue aqueous solution meet the incineration requirement, and the treatment is directly carried out after the compatibility.

The comparison is carried out in three experiments, wherein the oxazine inhibitor is not added in the first experiment, and the oxazine inhibitor is added in the second experiment and the third experiment. It can be seen that the reaction phenomenon is mild after the oxazine inhibitor is added.

The invention can destroy triethyl aluminum through hydrolysis, so that the triethyl aluminum is decomposed into triethoxy aluminum, ethane and aluminum hydroxide, and ethane gas generated by hydrolysis is subjected to photolysis and adsorption treatment after being completely collected by a tail gas absorption system; the oxazine inhibitor is added in the hydrolysis process, so that the reaction is not so violent, and the temperature is controllable; after hydrolysis, the water can be stored temporarily and safely, and secondary pollution to the environment can not be caused. The material heat value after hydrolysis is stable, the daily treatment amount is large, and the smoke exceeding caused by deflagration is avoided.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A mild method for treating triethyl aluminum in hazardous waste is characterized by comprising the following steps:

s1, disintegrating the rectification residue containing triethyl aluminum into small blocks;

s2, adding one thousandth of oxazine inhibitor into water, and stirring to obtain an aqueous solution containing the oxazine inhibitor;

s3, adding the rectification residue decomposed in the step S1 into the aqueous solution containing the oxazine inhibitor prepared in the step S2, and fully hydrolyzing the aqueous solution in water;

s4, collecting aluminum hydroxide waste residue, rectification residue aqueous solution and ethane waste gas generated in the hydrolysis process in the step S3;

s5, performing centralized treatment on the ethane waste gas by using a tail gas absorption system; the heat values of the aluminum hydroxide waste residue and the rectification residue aqueous solution meet the incineration requirement, and the treatment is directly carried out after the compatibility;

the oxazine inhibitor is a vulcanized diphenylamine salt.