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Comprehensive processing method for waste mercury catalyst

A waste mercury catalyst and comprehensive treatment technology, applied in the direction of improving process efficiency, can solve the problems of high equipment requirements, low mercury recovery rate, and high energy consumption, and achieve the effects of reducing difficulty, improving recovery rate, and reducing emissions

Inactive Publication Date: 2015-12-16
贵州蓝天固废处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of high equipment requirements and high energy consumption.
[0004] And no matter it is the high temperature method or the double salt method, after the waste mercury catalyst is treated, there are more mercury components in the waste residue, waste liquid and waste gas discharged into the environment, so that the content of mercury components discharged into the environment remains at the current level. At the technical level, that is, the discharge rate reaches 0.6%, or even more than 1%. This not only results in a low mercury recovery rate after comprehensive treatment of waste mercury catalysts, but also causes mercury components to leak into the environment, causing a large amount of environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for comprehensively treating waste mercury catalysts, comprising the following steps:

[0028] (1) After mixing the waste mercury catalyst and quicklime at a mass ratio of 0.95:3, place it in a natural environment for 5 hours, then place it in a boiler, and add water 0.1 times the weight of quicklime to the boiler , and adjust the temperature at the bottom of the boiler to 60°C for cooking for 10 hours, and then dry it at 45°C until the moisture content is 1%;

[0029] (2) Place the processed material in step 1 in a distillation furnace, and use a temperature of 700°C for distillation treatment to obtain steam and waste residue; and send the steam generated during the distillation process into a condensation tube for condensation treatment to obtain water vapor residue ;The steam slag is pumped to the natural sedimentation tank by a high-pressure pump for natural precipitation treatment for 20 hours, and a reactant is added to it during the precipitation treatm...

Embodiment 2

[0036] A method for comprehensively treating waste mercury catalysts, comprising the following steps:

[0037] (1) After mixing the waste mercury catalyst and quicklime at a mass ratio of 1.37:7, place it in the natural environment for 11 hours, then place it in a boiler, and add water 0.3 times the weight of quicklime into the boiler , and adjust the temperature at the bottom of the boiler to 80°C for cooking for 20 hours, and then dry it to a moisture content of 3%;

[0038](2) Place the processed material in step 1 in a distillation furnace, and use distillation at a temperature of 750°C to obtain steam and waste residue; and send the steam generated during the distillation process into a condensation tube for condensation treatment to obtain water vapor residue ;The water vapor slag is pumped to the natural sedimentation tank by a high-pressure pump for natural precipitation treatment for 30 hours, and a reactant is added to it during the precipitation treatment process, a...

Embodiment 3

[0046] A method for comprehensively treating waste mercury catalysts, comprising the following steps:

[0047] (1) After mixing the waste mercury catalyst and quicklime at a mass ratio of 1:5, place it in the natural environment for 8 hours, then put it in a boiler, and add water 0.2 times the weight of quicklime to the boiler , and adjust the temperature at the bottom of the boiler to 70°C for cooking for 15 hours, and then dry it at 55°C until the moisture content is 2%;

[0048] (2) Place the processed material in step 1 in a distillation furnace, and use distillation at a temperature of 730°C to obtain steam and waste residue; and send the steam generated during the distillation process into a condensation tube for condensation treatment to obtain water vapor residue ;The steam slag is pumped to the natural sedimentation tank by a high-pressure pump for natural precipitation treatment for 25 hours, and a reactant is added to it during the precipitation treatment process, r...

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Abstract

The invention relates to the technical field of comprehensive processing for waste mercury catalysts, in particular to a comprehensive processing method for a waste mercury catalyst. The waste mercury catalyst is mixed with quick lime and then boiled, so that effective ingredients of the waste mercury catalyst act with the quick lime, the purpose of curing the waste mercury catalyst is achieved, and the conversion efficiency of the waste mercury catalyst in the distillation process is improved; steam with mercury obtained after distillation is cooled to obtain steam residues, the steam residues act with a reactant, and mercury ingredients in the steam residues are precipitated greatly; and through ultrasonic processing coupled with centrifugal processing, the reactant and the steam residues can act more thoroughly, the rate of mercury recovery performed after mercury catalyst processing is improved, waste liquid emissions are reduced, environmental pollution is reduced, and the content of mercury discharged in the environment is reduced to 0.09-0.13%.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment of waste mercury catalysts, in particular to a method for comprehensive treatment of waste mercury catalysts. Background technique [0002] Mercury chloride catalyst (commonly known as mercury catalyst) is used as a catalyst for the synthesis of vinyl chloride (VCM) from acetylene and hydrogen chloride gas in PVC by the calcium carbide method. It uses activated carbon as the carrier and mercuric chloride as the active substance, and mercuric chloride is loaded on the surface of the activated carbon. After the mercury catalyst has been used for a certain period of time, its activity decreases and needs to be replaced. The replaced waste mercury catalyst generally contains about 2% to 5% of mercury chloride. The main reasons for the failure of mercury catalysts are: sublimation of HgCl2 at high temperature, which greatly reduces the content of mercury chloride; phosphorus and sulfur ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B43/00
CPCY02P10/20
Inventor 吴斌
Owner 贵州蓝天固废处置有限公司
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