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Method for producing silver chloride and bismuth nitrate from mercury-containing waste liquid

A technology of silver chloride and bismuth nitrate, applied in chemical instruments and methods, silver halide, inorganic chemistry, etc., can solve the problems of ineffective utilization of waste mercury and secondary pollution, and achieve the effects of pollution prevention and considerable economic benefits.

Inactive Publication Date: 2016-08-24
CHANGDE YUNGANG BIOTECHNOLOGY CO LTD
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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

[0016] 500Kg spent mercury catalyst is made silver chloride co-production mercuric oxide and bismuth nitrate through following three steps:

[0017] The first step is to send the waste mercury catalyst into a sealed still for distillation, turn on the power supply and heat up to 295-315 degrees Celsius to directly sublimate mercury chloride into gas, and then cool it into liquid mercury chloride;

[0018] In the second step, the mercuric chloride solution obtained above is reacted with the silver nitrate solution with a pure mass ratio of 1: 1.05 to generate a mixed solution of silver chloride precipitation and mercuric nitrate; then obtain filter cake silver chloride through closed suction filtration, and Washing and drying, pulverizing and packaging to obtain 31Kg of silver chloride product; the clarified mercuric nitrate solution is processed in the next step;

[0019] The third step is to react the mercuric nitrate solution obtained above with the bismuth hydroxide emulsio...

Embodiment 2

[0021] 500Kg spent mercury catalyst is made silver chloride co-production mercuric oxide and bismuth nitrate through following three steps:

[0022] The first step is to send the waste mercury catalyst into a sealed still for distillation, turn on the power supply and heat up to 295-315 degrees Celsius to directly sublimate mercury chloride into gas, and then cool it into liquid mercury chloride;

[0023] In the second step, the mercuric chloride solution obtained above is reacted with the silver nitrate solution with a pure mass ratio of 1: 1.25 to generate a mixed solution of silver chloride precipitation and mercuric nitrate; Washing and drying, pulverizing and packaging to obtain 36.9Kg of silver chloride product; clarified mercuric nitrate solution is processed in the next step;

[0024] The third step is to react the mercuric nitrate solution obtained above with the bismuth hydroxide emulsion at a pure mass ratio of 1:0.61 to generate a mixed solution of mercuric oxide p...

Embodiment 3

[0026] 500Kg spent mercury catalyst is made silver chloride co-production mercuric oxide and bismuth nitrate through following three steps:

[0027] The first step is to send the waste mercury catalyst into a sealed still for distillation, turn on the power supply and heat up to 295-315 degrees Celsius to directly sublimate mercury chloride into gas, and then cool it into liquid mercury chloride;

[0028] In the second step, the mercuric chloride solution obtained above is reacted with the silver nitrate solution with a pure mass ratio of 1: 1.45 to generate a mixed solution of silver chloride precipitation and mercuric nitrate; then obtain filter cake silver chloride through closed suction filtration, and Washing and drying, pulverizing and packaging to obtain 42.8Kg of silver chloride product; the clarified mercuric nitrate solution is processed in the next step;

[0029] The third step is to react the mercuric nitrate solution obtained above with the bismuth hydroxide emuls...

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PUM

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Abstract

The invention discloses a method for producing silver chloride and bismuth nitrate from a mercury-containing waste liquid. The method comprises feeding a waste mercury catalyst into a seal-type distiller, carrying out distillation so that mercuric chloride is directly sublimated to form gas and is cooled to form a liquid, carrying out a reaction process on the mercuric chloride solution and the silver nitrate solution to obtain a silver nitrate precipitate-mercury nitrate mixed solution, carrying out enclosed pumping filtration to obtain silver chloride filter cake, carrying out washing, drying, crushing and packaging to obtain a silver chloride product, further processing the clear mercury nitrate solution, carrying out a reaction process on the mercury nitrate solution and a bismuth hydroxide emulsion to produce a mercuric oxide precipitate-bismuth nitrate mixed solution, filtering the mixed solution to obtain mercuric oxide filter cake, carrying out washing, spin-drying, drying, crushing and packaging to obtain a mercuric oxide product, carrying out distillation on the clear bismuth nitrate solution, carrying out cooling, carrying out crystallization and carrying out packaging to obtain a bismuth nitrate crystal product. The method effectively prevents waste mercury catalyst-caused environmental pollution and produces high 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 producing silver chloride and bismuth nitrate by using mercury-containing waste liquid. Background technique [0002] In the synthesis of vinyl chloride by the acetylene method, a high-mercury catalyst with a mercuric chloride content of 10 wt% is used industrially. Because 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. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00C01G5/02
Inventor 邓家国
Owner CHANGDE YUNGANG BIOTECHNOLOGY CO LTD
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