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Method for recovering mercury from multi-element mercury-containing hazardous solid wastes by high-temperature rotary roasting

A solid waste and roasting technology, which is applied in the fields of environmental protection and metallurgy, can solve problems such as inability to perform chlorination recovery, and achieve the effect of solving disorderly discharge, simple process, and environmental pollution control

Active Publication Date: 2015-04-22
贵州重力科技环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the current patented technology, there is no relevant report on the recovery of mercury from multi-component mercury-containing solid waste using the method of rotary roasting and condensation. The traditional mercury recovery method in mercury-containing solid waste is suitable for the recovery of mercury in waste catalysts. , different forms of mercury resources in metallurgical slag and flue ash cannot be chlorinated and recovered. In this patented technology, mercury resources of different forms and different valences in mercury-containing wastes can be comprehensively recycled. Therefore, the development of a A technology for recovering mercury from multivariate mercury-containing solid waste is imperative for the development of the PVC industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for recycling mercury by high-temperature rotary roasting multi-element mercury-containing hazardous solid waste, comprising the following steps:

[0016] The waste catalyst in the polyvinyl chloride catalytic conversion section, whose mercury content is 2-3%, and the crushed particle size is 130-150 μm, is mixed with quicklime containing 20% ​​of the total amount of mercury-containing solid waste, and heated and stirred with a stirring reactor. The stirring temperature is 80°C, the time is about 2h, high-temperature rotary furnace is used for roasting, the roasting temperature is about 800°C, the time is about 2h, first use cyclone dust collection, and then bag dust collection to collect dust from mercury vapor, use tube type condensation equipment The mercury vapor is condensed and collected in the mercury collection tank, and the mercury-containing tail gas is recovered by using the packed adsorption tower. The recovery rate of mercury is 95~99%.

Embodiment 2

[0018] A method for recycling mercury by high-temperature rotary roasting multi-element mercury-containing hazardous solid waste, comprising the following steps:

[0019] Mix mercury-containing non-ferrous metallurgical slag with a mercury content of 4-20% and a crushed particle size of 130-150 μm into quicklime containing 30% of the total amount of mercury-containing solid waste, and heat and stir in a stirring reactor at a stirring temperature of 70°C for a period of time For about 2 hours, high-temperature rotary furnace is used for roasting, the roasting temperature is about 850 ° C, and the time is about 6 hours. First, dust is collected by cyclone, and then dust is collected by bag dust. The condensation is collected in the mercury collection tank, and the mercury-containing tail gas is recovered by using the packed adsorption tower. The recovery rate of mercury is 97~99%.

Embodiment 3

[0021] A method for recycling mercury by high-temperature rotary roasting multi-element mercury-containing hazardous solid waste, comprising the following steps:

[0022] The mercury-containing flue ash, whose mercury content is 4-40%, is crushed to a particle size of 130-150 μm, mixed with quicklime containing 40% of the total amount of mercury-containing solid waste, and heated and stirred in a stirring reactor at a stirring temperature of 90 ° C. The time is about 2 hours, and the high-temperature rotary furnace is used for roasting. The roasting temperature is about 750 ° C, and the time is about 8 hours. Condensation is collected in the mercury collection tank, and the mercury-containing tail gas is recovered by using a packed adsorption tower. The recovery rate of mercury is 96-99%.

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Abstract

The invention discloses a method for recovering mercury from multi-element mercury-containing hazardous solid wastes by high-temperature rotary roasting, and belongs to the field of environmental protection and metallurgy. The method comprises the following steps: crushing multi-element mercury-containing solid wastes namely nonferrous metallurgy slag, flue dust and waste catalysts until the granularity is 130-150 microns; adding quicklime accounting for 20-40% of the total weight of the mercury-containing solid wastes, and stirring continuously at 70-90 DEG C for 2 hours to ensure that mercury compounds are converted into mercury oxide; roasting in a high-temperature rotary furnace at a roasting temperature of 75-850 DEG C for 2-8 hours to ensure that mercury oxide is decomposed into mercury vapor; performing cyclone dust collection, and then performing bag dust collection to remove dust from the mercury vapor; performing two-stage condensation recovery on the mercury vapor by adopting tubular condensing equipment, and condensing and collecting the mercury vapor in a mercury collecting tank; and recovering mercury-containing tail gas by adopting a filler adsorption tower. By adopting the method disclosed by the invention, the problems of difficult stacking of the multi-element mercury-containing solid wastes, environmental pollution and mercury recovery are solved, and the economic value of mercury is improved.

Description

technical field [0001] The invention belongs to the fields of environmental protection and metallurgy, and specifically relates to a method for recovering mercury in multi-component mercury-containing solid waste. Background technique [0002] With the continuous expansion of the industrial scale of the production of polyvinyl chloride by the calcium carbide method, the amount of mercuric chloride catalyst is also increasing, while the original ecological mercury resources are becoming less and less. Before the development and application of mercury-free alternatives, the multi-component mercury-containing solid waste and recovery of mercury from it is of great importance. Multivariate mercury-containing solid waste mainly refers to mercury-containing waste catalyst, flue ash and mercury-containing waste acid sludge. With the improvement of living standards, the requirements for environmental protection systems are becoming increasingly stringent. It is imperative to recov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B43/00C22B7/00
Inventor 王良栋李武斌张彬陈明慧
Owner 贵州重力科技环保股份有限公司
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