Method for recycling mercury from mercury-containing solid wastes

A technology of solid waste and recovery method, applied in the direction of mercury halide and other directions, can solve the problems of low recovery rate, inconvenient operation, environmental pollution, etc., and achieve the effect of high recovery efficiency and easy operation

Inactive Publication Date: 2013-02-27
XINJIANG TIANYE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the environmental pollution and serious waste of mercury resources caused by the landfill treatment of mercury-containing solid waste, the recovery rate...

Method used

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  • Method for recycling mercury from mercury-containing solid wastes

Examples

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Effect test

Embodiment 1

[0024] A method for recovering mercury in mercury-containing solid waste, including drying, chlorination, dry distillation, and absorption steps, 500Kg of mercury-containing solid waste 2 with a mercury content of 0.50% is loaded into a closed reactor 4, and the closed reactor 2 Heating, the heat transfer oil is introduced from the heat transfer oil inlet 6, and the heat transfer oil is discharged from the heat transfer oil outlet 3 after heating, and the N 2 Drying, control temperature 150°C, drying time 2 hours; turn off N 2 , into the above-mentioned dried mercury-containing solid waste 3, pass the dry Cl preheated by the preheater 1 2 , then raised to 250°C for 1 hour, then raised to 350°C for 2 hours; closed Cl 2 , N into the closed reactor 2 , the temperature was raised to 450°C for 2 hours, and then the temperature was raised to 550°C for 3 hours; the dry Cl that was preheated by the preheater 1 was passed into the above-mentioned dried mercury-containing solid waste ...

Embodiment 2

[0025] The difference between embodiment 2 and embodiment 1 is that the absorption process can use a spray device to absorb mercury chloride in the gas phase.

Embodiment 3

[0026] The difference between embodiment 3 and embodiment 1 or 2 is that a certain amount of dried Cl after being preheated by preheater 1 is passed into the closed reactor. 2 , and maintain a certain pressure, close the inlet and outlet of the airtight reactor, and do not need to open the power device of the circulating solvent storage tank 5 at the same time.

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Abstract

The invention discloses a method for recycling mercury from mercury-containing solid wastes. The method comprises the following steps: introducing N2 (or other inert gases) into mercury-containing wastes at 100 DEG C-200 DEG C and drying for 0.5-10 hours; introducing the chlorine at 200 DEG C-400 DEG C for chlorinating for 0.5-10 hours; introducing N2 again at 400 DEG C-750 DEG C and dry distilling for 1-10 hours; and lastly, washing with a solvent, thereby obtaining a product, and meanwhile, absorbing the dry distilling tail gas by using absorption liquid. According to the method, the recovery rate of the mercury can reach 80-99%; the recycled waste mercury bichloride contact agent carrier is not damaged; the mercury content is extremely reduced to below 0.1% and the recycled waste mercury bichloride contact agent carrier still can be applied to the production of a mercury bichloride contact agent; the pollution problem of the mercury-containing waste and the recycling problem of the mercury resource are solved according to the method; the traditional mercury recycling method and the mercury bichloride production are integrated; the production cost is saved; and the method has the advantages of zero remnant of waste residue and waste water, simpleness in technology, low cost, waste recycling and environmental protection.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of mercury-containing waste, and is especially suitable for the recovery of mercury in a waste mercury catalyst for acetylene hydrochlorination. Background technique [0002] Mercury is a silvery-white liquid metal that is highly volatile at room temperature. It is widely used in industrial sectors such as chemical and petrochemical industries, pharmaceuticals, pulp and paper, electrical and electronic instruments, and is known as "exhaust gas, waste residue, waste water". ways to pollute the environment. Among them, the waste residue mainly comes from the waste mercury catalyst produced by the calcium carbide method PVC industry. The national calcium carbide method PVC industry produces nearly 10,000 tons of waste mercury catalyst every year, and the mercury content reaches 2-5%. Such a large amount of mercury-containing waste brings environmental protection. At p...

Claims

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Application Information

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IPC IPC(8): C01G13/04
Inventor 庞晓东李春华王小昌李静陈万银李国栋周军
Owner XINJIANG TIANYE GRP
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