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

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...