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A waste mercury catalyst mercury recovery and slag harmless treatment process

A technology of harmless treatment and waste mercury catalyst, which is applied in gas treatment, process efficiency improvement, chemical instruments and methods, etc., can solve the problems of low mercury recovery rate, environmental pollution, leakage of mercury components, etc., to reduce mercury content , reduce the impact of pollution, reduce the effect of stress

Inactive Publication Date: 2020-06-12
喜德县良在硅业有限公司
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Problems solved by technology

[0004] No matter the distillation method or the oxygen-controlled dry distillation method, after the waste mercury catalyst is treated, there are still many mercury components in the waste residue, waste liquid and waste gas discharged into the environment, which not only causes the mercury recovery rate after the waste mercury catalyst comprehensive treatment is relatively low Low, also caused mercury components to leak into the environment, causing a lot of environmental pollution

Method used

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  • A waste mercury catalyst mercury recovery and slag harmless treatment process
  • A waste mercury catalyst mercury recovery and slag harmless treatment process

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0031] Such as figure 1 As shown, a waste mercury catalyst mercury recovery and slag harmless treatment process includes the following process steps:

[0032] (1) alkalization pretreatment

[0033] The waste mercury catalyst and quicklime enter their respective silos through the bucket elevator, and then enter the pretreatment reaction kettle after being fully mixed by the screw feeder, and at the same time add water to stir and mix well. Heat the mixed materials in the reaction kettle to a temperature of about 80°C, stir for 2 hours, and remove the HgCl in the waste mercury catalyst 2 Converted into HgO, the chemical reaction equation is:

[0034]

[0035] Note: The decomposition temperature of mercuric oxide is 500°C, and the temperature in the pretreatment reactor in...

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Abstract

The invention relates to a mercury recovering and residue harmless treatment process for a waste mercury catalyst. On the basis of the technological process of an existing distillation method, a technology processing method involving a high temperature rotary kiln, a second combustion chamber, quenching and activated carbon adsorption is added to waste activated carbon residues discharged out of adistilling furnace, so that the residues produced by the distilling furnace are completely converted into common solid waste residues and duly handled, and the problem that the residues cause secondary environment pollution in the previous technological process and need to be transferred to a unit with the further handling qualification is solved.

Description

technical field [0001] The invention relates to the field of waste recycling and treatment, in particular to a waste mercury catalyst mercury recovery and slag harmless treatment process. Background technique [0002] Mercury chloride catalyst (commonly known as mercury catalyst) is used as a catalyst for the synthesis of vinyl chloride (VCM) from acetylene and hydrogen chloride gas in PVC by the calcium carbide method. It uses activated carbon as the carrier and mercuric chloride as the active substance, and mercuric chloride is loaded on the surface of the activated carbon. 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. The main reasons for the failure of mercury catalysts are: HgCl at high temperature 2 Sublimation greatly reduces the content of mercuric chloride; phosphorus and sulfur in the raw gas poison th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B43/00C22B1/02B01D53/02B01D53/78
CPCB01D53/02B01D53/78B01D2253/102B01D2257/602C22B1/02C22B43/00Y02P10/20
Inventor 王勇智胡良在
Owner 喜德县良在硅业有限公司
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