Distillation recovery method of waste mercury catalyst

A waste mercury catalyst, distillation recovery technology, applied in the direction of improving process efficiency, can solve the problems of large waste gas treatment volume and total emission environmental pollution, etc., and achieve the effect of improving cleanliness and high adsorption performance of mercury

Inactive Publication Date: 2021-01-22
新晃鲁湘钡业有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the waste gas condensed by mercury vapor in dry treatment is directly discharged by conventional purification treatment, and the amount of waste gas treatment is large. Even if the discharge reaches the standard, the cumulative total discharge will also cause serious environmental pollution.

Method used

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Embodiment Construction

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application. rather than all examples.

[0026] It should be noted that when an element is referred to as being "fixed" or "disposed on" another element, it may be directly disposed on another element or indirectly disposed on another element; when an element is referred to as being "connected" It may be directly connected to another element or indirectly connected to another element.

[0027] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are only for the co...

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Abstract

The invention discloses a distillation recovery method of a waste mercury catalyst. The method includes the following steps that the waste mercury catalyst is placed in a sodium hydroxide solution, heating is performed to enable mercuric chloride in the waste mercury catalyst to react with sodium hydroxide to convert the mercuric chloride into mercuric oxide, and pretreated waste is obtained; thepretreated waste is placed in a distillation furnace, and heating is performed to decompose mercury oxide in the pretreated waste into mercury vapor; the mercury vapor is introduced into an air condenser for indirect condensation, most of the mercury vapor forms liquid metal mercury, the liquid metal mercury falls into a mercury collecting box at the lower part for storage, and liquid metal mercury and mercury soot are obtained through condensing of the residual mercury vapor by the aid of a multi-tube condenser and enter a mercury collecting tank at the lower part; the tail gas is adsorbed bymodified activated carbon, and the adsorbed tail gas is washed by a sodium sulfide solution and is discharged. Compared with the prior art, the modified activated carbon is adopted to adsorb the tailgas generated after distillation of the waste mercury catalyst, the mercury absorption capacity of the activated carbon can be improved, and thus the cleanliness of the tail gas can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of industrial waste recovery and treatment, in particular to a distillation recovery method for waste mercury catalyst. Background technique [0002] When the calcium carbide method is used to produce vinyl chloride, it is necessary to use a mercury catalyst with a mercury chloride content of up to 10 wt% as a catalyst to catalyze the synthesis of vinyl chloride from acetylene and hydrogen chloride gas. Mercury catalyst is a kind of catalyst with activated carbon as the carrier and mercuric chloride as the active substance. 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. At present, my country is the largest PVC producer in the world, and a large amount of waste mercury catalyst is produced in the production process due to HgCl 2 It is highly tox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B43/00
CPCC22B7/009C22B7/001C22B43/00Y02P10/20
Inventor 龙凤华王瑞辉
Owner 新晃鲁湘钡业有限公司
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