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A method for synchronous recovery of mercury in spent mercury catalysts and regenerated activated carbon

A waste mercury catalyst and activated carbon technology, applied in chemical instruments and methods, separation methods, chemical recovery, etc., can solve the problems of complicated process, low recovery rate of mercury chloride and activated carbon regeneration, and achieve high recovery rate of mercury and significant economic value , The process is clean and pollution-free

Active Publication Date: 2019-07-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent realizes the recovery of mercuric chloride and the regeneration of activated carbon, the process is complicated, and the recovery rate of mercuric chloride and the regeneration of activated carbon are all low

Method used

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  • A method for synchronous recovery of mercury in spent mercury catalysts and regenerated activated carbon
  • A method for synchronous recovery of mercury in spent mercury catalysts and regenerated activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: as figure 1 Shown, a method for synchronously reclaiming mercury in waste mercury catalysts and regenerating activated carbon, the specific steps are as follows:

[0021] (1) Mix 100g of waste mercury catalyst and lye (the concentration of lye is 0.1mol / L, and the lye is a mixed solution of sodium hydroxide and calcium hydroxide) and soak them under ultrasonic conditions at a temperature of 90°C 1h obtains mixture A, wherein the solid-to-liquid ratio g:mL of waste mercury catalyst and lye is 1:1, the ultrasonic frequency is 2500 Hz, and the ultrasonic power is 10W;

[0022] (2) Filter the mixture A obtained in step (1) to obtain the filtrate and filter residue, and return the filtrate to step (1) to replace the lye for soaking;

[0023] (3) Under the condition of activated gas (activated gas is carbon dioxide gas), microwave the filter residue obtained in step (2) for 50 minutes to obtain regenerated activated carbon and tail gas I, wherein the power of m...

Embodiment 2

[0026] Embodiment 2: as figure 1 Shown, a method for synchronously reclaiming mercury in waste mercury catalysts and regenerating activated carbon, the specific steps are as follows:

[0027] (1) Mix 100g of waste mercury catalyst and lye (the concentration of lye is 10mol / L, and the lye is a mixed solution of sodium hydroxide and ammonia water) and soak for 3 hours under ultrasonic conditions at a temperature of 60°C to obtain a mixture A, wherein the solid-to-liquid ratio g:mL of waste mercury catalyst and lye is 1:4, the ultrasonic frequency is 1500 Hz, and the ultrasonic power is 100W;

[0028] (2) Filter the mixture A obtained in step (1) to obtain the filtrate and filter residue, and return the filtrate to step (1) to replace the lye for soaking;

[0029] (3) Under the condition of activated gas (the activated gas is carbon dioxide gas), microwave the filter residue obtained in step (2) for 10 minutes to obtain regenerated activated carbon and tail gas I, wherein the po...

Embodiment 3

[0032] Embodiment 3: as figure 1 Shown, a method for synchronously reclaiming mercury in waste mercury catalysts and regenerating activated carbon, the specific steps are as follows:

[0033] (1) Soak 100g of waste mercury catalyst and lye (the concentration of lye is 20mol / L, and the lye is sodium hydroxide solution) for 4 hours under ultrasonic conditions at a temperature of 70°C to obtain mixture A, in which the waste mercury catalyst The solid-to-liquid ratio g:mL of lye is 1:6, the ultrasonic frequency is 20Hz, and the ultrasonic power is 200W;

[0034] (2) Filter the mixture A obtained in step (1) to obtain the filtrate and filter residue, and return the filtrate to step (1) to replace the lye for soaking;

[0035] (3) Under the condition of activated gas (the activated gas is water vapor), microwave the filter residue obtained in step (2) for 180 minutes to obtain regenerated activated carbon and tail gas I, wherein the power of microwave roasting is 50W;

[0036] (4)...

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Abstract

The invention relates to a method for synchronously recovering mercury and regenerated activated carbon in a waste mercury catalyst, and belongs to the technical field of recovering and reusing of a waste mercuric chloride catalyst. The waste mercury catalyst and alkali liquor are evenly mixed to be soaked under the ultrasonic wave condition to obtain a mixture A, the mixture A is filtered to obtain filter liquor and filter residues, and the alkali liquor is replaced with the filter liquor for soaking; under the excitation gas condition, the filter residues are subject to microwave roasting to obtain the regenerated activated carbon and tail gas I; and the tail gas I condensates to obtain mercury and tail gas II, the tail gas II is absorbed by the activated carbon to obtain gas capable of being discharged and adsorbing saturation activated carbon, and the adsorbing saturation activated carbon returns to be subject to microwave roasting. According to the method, pollution is avoided during cleaning in the technological process, the mercury recovering rate is high, the activated carbon can be regenerated synchronously, and the economic value and the benefit of environmental protection are achieved.

Description

technical field [0001] The invention relates to a method for synchronously recovering mercury and regenerated active carbon in waste mercury catalysts, belonging to the technical field of waste mercury catalyst recovery and utilization. Background technique [0002] Mercury chloride catalyst is a catalyst for the production of vinyl chloride in my country's chemical industry. Once the catalyst is deactivated, a large amount of waste mercury catalyst will be produced. Since the waste catalyst contains a certain amount of mercury, which has leaching toxicity, it is necessary to carry out harmless disposal of the waste mercury catalyst. The relatively mature mercury recovery process used in industry is the chemical pretreatment-roasting method. The process is to first soak or boil the waste mercury catalyst with alkali to make the HgCl in it 2 Converting to HgO, this step is called chemical pretreatment, and then use a distillation furnace or a vertical blast furnace to smelt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B43/00C01B32/36B01J20/34B01J20/20
CPCB01J20/3416C22B7/006C22B43/00Y02P10/20Y02P20/584
Inventor 张利波刘超刘晨辉彭金辉夏洪应胡途马爱元林国
Owner KUNMING UNIV OF SCI & TECH
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