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Method for cooperatively treating waste mercuric chloride contact agent through microwaves and ultrasonic waves

A collaborative processing and ultrasonic technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of complex process, low recovery rate of mercury chloride and low regeneration rate of activated carbon, and achieve short processing time, save processing time and The effect of process energy consumption and low energy consumption

Inactive Publication Date: 2017-08-08
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0006] The process of the existing waste mercury catalyst treatment method is relatively complicated, and the recovery rate of mercuric chloride and the regeneration rate of activated carbon are low

Method used

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  • Method for cooperatively treating waste mercuric chloride contact agent through microwaves and ultrasonic waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: as figure 1 Shown, a kind of method of microwave and ultrasonic co-processing waste mercuric chloride catalyst, concrete steps are as follows:

[0025] (1) Mix 50g of spent mercuric chloride catalyst and 10g of quicklime to obtain mixture A. The mass ratio of spent mercury catalyst to quicklime in mixture A is 5:1; Ratio, add 0.12L water to mixture A and mix well to obtain mixture B;

[0026] (2) Under microwave and ultrasonic conditions, where the ultrasonic frequency is 20 Hz, the ultrasonic power is 30 W, and the microwave power is 50 W, the mixture B obtained in step (1) is leached for 20 minutes, filtered, and then placed at a temperature of 80 Dry under microwave conditions at ℃ for 40min;

[0027] (3) Under the condition of nitrogen, where nitrogen is fed from the bottom of the furnace, the nitrogen flow rate is 10L / min, and the nitrogen purity is 90%, the product obtained in step (2) is subjected to microwave roasting to obtain material C, which ...

Embodiment 2

[0030] Embodiment 2: as figure 1 Shown, a kind of method of microwave and ultrasonic co-processing waste mercuric chloride catalyst, concrete steps are as follows:

[0031] (1) Mix 50g of spent mercury chloride catalyst and 5g of quicklime to obtain mixture A. The mass ratio of spent mercury catalyst to quicklime in mixture A is 10:1; Ratio, add 1.1L water to mixture A and mix well to obtain mixture B;

[0032] (2) Under microwave and ultrasonic conditions, where the ultrasonic frequency is 1100 Hz, the ultrasonic power is 10 W, and the microwave power is 1200 W, the mixture B obtained in step (1) is leached for 100 minutes, filtered, and then placed at a temperature of 110 ° C Dry under microwave conditions for 18min;

[0033] (3) Under the condition of nitrogen, where nitrogen is fed from the bottom of the furnace, the nitrogen flow rate is 80L / min, and the nitrogen purity is 81%, the product obtained in step (2) is subjected to microwave roasting to obtain material C, whi...

Embodiment 3

[0036] Embodiment 3: as figure 1 Shown, a kind of method of microwave and ultrasonic co-processing waste mercuric chloride catalyst, concrete steps are as follows:

[0037] (1) Mix 50g of spent mercuric chloride catalyst and 12.5g of quicklime to obtain mixture A. The mass ratio of spent mercury catalyst to quicklime in mixture A is 4:1; according to the liquid-solid ratio of water to mixture A, mL:g is 10:1 The ratio of 0.625L water is added to mixture A and mixed evenly to obtain mixture B;

[0038] (2) Under microwave and ultrasonic conditions, wherein the ultrasonic frequency is 2500 Hz, the ultrasonic power is 200 W, and the microwave power is 3000 W, the mixture B obtained in step (1) is leached for 240 minutes, filtered, and then placed at a temperature of 100 Dry under microwave conditions at ℃ for 10 minutes;

[0039] (3) Under the condition of nitrogen, where nitrogen is introduced from the surface of the raw material, the nitrogen flow rate is 180L / min, and the ni...

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Abstract

The invention relates to a method for cooperatively treating a waste mercuric chloride contact agent through microwaves and ultrasonic waves and belongs to the technical field of recycling and reusing of waste mercuric chloride contact agents. The method comprises the steps of mixing the waste mercuric chloride contact agent with quick lime, so that a mixture A is obtained, adding water to the mixture A, and mixing the materials uniformly, so that a mixture B is obtained; under the microwave and ultrasonic wave condition, making the mixture B be subjected to a leaching reaction, and conducting filtration and drying; under the nitrogen gas condition, conducting microwave roasting on a drying product, so that mercury and a material C are obtained; and adding water to the material C, and then conducting ultrasonic wave leaching, so that activated carbon and metal salt are obtained. According to the method, in the pretreatment process, the microwaves and the ultrasonic waves are synchronously introduced to cooperatively intensify the alkaline leaching process; cooperative treatment is conducted through the microwaves and the ultrasonic waves; under the synergistic effect of heating, the cavitation effect and the catalytic effect, an enclosing body on the surface of the waste contact agent is opened; organic deposited carbon is degraded; and a reaction occurring between alkaline liquor and mercuric chloride is accelerated, thus energy consumption generated in the process is lowered, and treatment time is shortened.

Description

technical field [0001] The invention relates to a method for synergistically treating waste mercury chloride catalysts with microwaves and ultrasonic waves, and belongs to the technical field of recycling waste mercury catalysts. Background technique [0002] my country is the world's largest producer of PVC, and more than 70% of PVC is produced by the calcium carbide method. This process requires the use of activated carbon loaded with mercury chloride as a catalyst. Its mercury consumption accounts for 60% of my country's mercury consumption and 30% of global mercury consumption. my country has become the world's largest mercury consumer. Once these mercury catalysts are discarded, a large amount of waste mercury catalysts will be produced. Due to the high toxicity of mercury leached from the waste catalysts, improper disposal will pose a great threat to the environment. Therefore, before the catalyst is discarded, most enterprises recycle the mercury in the waste mercury...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B43/00C22B1/02C01B32/36
CPCC22B1/02C22B7/006C22B43/00Y02P10/20
Inventor 张利波刘超彭金辉刘明刘晨辉马爱元王璐田时鸿
Owner KUNMING UNIV OF SCI & TECH
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