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Method for preparing lead chloride and calomel from mercury-containing waste catalyst

A waste mercury catalyst and waste mercury catalyst technology, which is applied in the fields of lead halide, solid waste removal, mercury halide, etc., can solve the problems of secondary pollution and waste mercury not being effectively used, and achieve pollution prevention and considerable economic benefits.

Inactive Publication Date: 2011-07-06
何侠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] First, the waste mercury after the reaction is not only not effectively utilized, but also causes secondary pollution;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Lead chloride and calomel are produced from the spent mercury catalyst through the following three steps:

[0016] The first step is to send 500Kg of waste mercury catalyst into a sealed still for distillation, turn on the power supply and heat it to 300-304 degrees Celsius to directly sublimate mercury chloride into gas, and then cool it into liquid mercury chloride;

[0017] In the second step, the mercuric chloride solution obtained above is reacted with the lead particles at a pure mass ratio of 1:0.56 to generate a mixed solution of lead chloride and calomel; the mixed solution is obtained through closed suction filtration to obtain filter cake lead chloride, and Washing, dehydration and packing obtain lead chloride product 26.3Kg; The clarified calomel solution carries out next step processing;

[0018] In the third step, the calomel solution obtained above is sent into a sealed atmospheric pressure still for distillation. When the distillation temperature reaches...

Embodiment 2

[0020] Lead chloride and calomel are produced from the spent mercury catalyst through the following three steps:

[0021] The first step is to send 500Kg of waste mercury catalyst into a sealed still for distillation, turn on the power supply and heat it to 300-304 degrees Celsius to directly sublimate mercury chloride into gas, and then cool it into liquid mercury chloride;

[0022] In the second step, the mercuric chloride solution obtained above is reacted with the lead particles in a pure mass ratio of 1:0.76 to generate a mixed solution of lead chloride and calomel; the mixed solution is obtained through closed suction filtration to obtain filter cake lead chloride, and Washing, dehydration and packing obtain lead chloride product 35.7Kg; The clarified calomel solution carries out next step processing;

[0023] In the third step, the calomel solution obtained above is sent into a sealed atmospheric pressure still for distillation. When the distillation temperature reaches...

Embodiment 3

[0025] Lead chloride and calomel are produced from the spent mercury catalyst through the following three steps:

[0026] The first step is to send 500Kg of waste mercury catalyst into a sealed still for distillation, turn on the power supply and heat it to 300-304 degrees Celsius to directly sublimate mercury chloride into gas, and then cool it into liquid mercury chloride;

[0027] In the second step, the mercuric chloride solution obtained above is reacted with the lead particles at a pure mass ratio of 1: 0.96 to generate a mixed solution of lead chloride and calomel; the mixed solution is obtained through closed suction filtration to obtain filter cake lead chloride, and Washing, dehydration and packing obtain lead chloride product 45.1Kg; The clarified calomel solution carries out the next step processing;

[0028] In the third step, the calomel solution obtained above is sent into a sealed atmospheric pressure still for distillation. When the distillation temperature re...

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PUM

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Abstract

The invention provides a method for preparing lead chloride and calomel from a mercury-containing waste catalyst and relates to the technical field of three waste treatment and utilization of organic industrial mercury-containing waste catalysts. The mercury-containing waste catalyst is treated to produce lead chloride and calomel by the following three steps: firstly the mercury-containing waste catalyst is fed to a closed-type distiller to be distilled so that lead chloride is directly sublimated to a gas, and then the gas is cooled to produce liquid lead chloride; secondly the resulting lead chloride liquid reacts with lead particles to produce a mixed liquid of lead chloride and calomel, the mixed liquid is filtered under sealed conditions to produce a filter cake of lead chloride, and the filter cake of lead chloride is washed, dehydrated and packaged to obtain a lead chloride product; and finally the resulting calomel liquid is fed to a closed-type normal-pressure distiller to be distilled so that calomel is directly sublimated, and the sublimate is cooled and crystallized to obtain a calomel crystal product. The method effectively avoids the environmental pollution due to the mercury-containing waste catalyst and simultaneously creates higher economic benefits.

Description

technical field [0001] The invention relates to the technical field of three wastes treatment and utilization of waste mercury catalysts in the organic industry, in particular to a method for preparing lead chloride and calomel from mercury-containing waste catalysts. Background technique [0002] In the reaction to synthesize vinyl chloride by the acetylene method, a high-mercury catalyst with a mercuric chloride content of 10wt% is used industrially. Since mercuric chloride is easily sublimated and lost during the reaction, it will cause harm to the environment. People are seeking ways to improve the mercury catalyst used for the synthesis of vinyl chloride by the acetylene method, trying to develop a low-mercury or non-mercury catalyst, so that it has a longer life under higher conversion and selectivity, and The harm to the environment is minimized, and a good foundation is laid for the industrial application of low-mercury or non-mercury catalysts in the future. Throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/16C01G13/04B09B3/00
Inventor 何侠
Owner 何侠
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