Mercury-containing waste catalyst recycling method

Abstract

A mercury-containing waste catalyst recycling method relates to the technical field of ''three wastes'' treatment and utilization of organic industrial waste mercury catalysts. A waste mercury catalyst undergoes the following three steps for preparation of silver chloride and co-production of mercuric oxide and aluminium nitrate: firstly, sending the waste mercury catalyst into a sealed distillerfor distillation to directly sublimate mercuric chloride into a gas, and cooling to obtain liquid mercuric chloride; then carrying out a reaction between the above mercuric chloride solution and a silver nitrate solution to generate silver chloride precipitate and mercury nitrate mixed solution; carrying out closed suction filtration to obtain a filter cake silver chloride, washing and drying, crushing and packaging to obtain a silver chloride product; processing the clarified mercury nitrate solution; carrying out a reaction between the above mercuric nitrate solution and an aluminium hydroxide emulsion to generate mercuric oxide precipitate and aluminium nitrate mixed solution; filtering to obtain a filter cake mercuric oxide, washing, spin-drying, drying, crushing, and packaging to obtain a mercuric oxide product; and distilling the clarified aluminium nitrate solution, cooling, crystallizing and packaging to obtain an aluminium nitrate crystal product. By the method, the pollutionof the waste mercury catalyst to the environment is effectively prevented, and high economic benefit is generated.

Description

technical field [0001] The invention relates to the technical field of three-waste treatment and utilization of waste mercury catalysts in the organic industry, in particular to a recycling and utilization method for mercury-containing waste catalysts. 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. Through practice, a catalyst ...

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;