Method and device for jointly removing mercury from high-acidity chemical mercury-containing waste acid liquid

A technology for waste liquid and mercury removal, applied in the field of mercury treatment, can solve the problems of incomplete mercury removal, inability to meet stable standards, and inability to achieve, and achieve the effects of being beneficial to comprehensive utilization, reducing mercury content, and occupying less land.

Pending Publication Date: 2020-10-13
唐山周行科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The method mainly treats heavy metal wastewater such as mercury, or low-acidity mercury-containing wastewater, but for acids with a mass fraction of more than 30%, the above conventional methods cannot achieve
Although there is currently a mercury removal technology in high-acidity acid, the existing technology does not completely remove mercury and cannot meet the requirements of stable compliance

Method used

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  • Method and device for jointly removing mercury from high-acidity chemical mercury-containing waste acid liquid
  • Method and device for jointly removing mercury from high-acidity chemical mercury-containing waste acid liquid
  • Method and device for jointly removing mercury from high-acidity chemical mercury-containing waste acid liquid

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Experimental program
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Effect test

Embodiment 1

[0036] The high-acidity chemical mercury-containing waste liquid combined mercury removal device in this embodiment includes acid-resistant pumps (1, 4, 7, 20, 22), waste liquid storage tank 2, electrolytic deposition tank 3, elemental mercury storage tank 5, primary Mercury removal liquid storage tank 6, jet tube 8, jet tube 9, hydrogen sulfide generator 10, hydrogen sulfide storage tank 12, continuous vulcanization reaction device 14, mercury release stop valve 15, mud pump 16, solid-liquid separator 17, sewage Mud receiving tank 18, secondary purification liquid adsorption tank 21, liquid outlet pipe 23 and mud discharge stop valve 24.

[0037] The high-acidity chemical industry mercury-containing waste liquid combined mercury removal device in this embodiment consists of three parts:

[0038] (1) Diaphragm electrodeposition unit. Including waste liquid storage tank 2, electrolytic deposition tank 3, elemental mercury storage tank 5 and primary mercury removal liquid stora...

Embodiment 2

[0047] Take 1# chemical industry sulfonated salting-out filtrate for experimental research, the research process is as follows:

[0048] The first step is the step of removing mercury by diaphragm electrodeposition. The mercury concentration in the initial high-acidity chemical mercury-containing waste liquid is 11300mg / L, and the acid concentration is 31.50%. A vertical diaphragm electrolyzer is used. The diaphragm is a cation exchange membrane. Deposition cathode current density is 60A / m 2 , the same pole distance is 100mm, the additive thiourea is 0.5g / L, and the electrodeposition time is 60min. Cr 9.55×10 4 mg / L decreased to 3.6×10 4 mg / L or less, as shown in Table 2.

[0049] The second step is the step of continuous sulfidation and mercury removal. Seal the two jet tubes at the inlets on both sides of the three-necked flask. The hydrogen sulfide reactor is a conical flask with a sealed tee, and then seal it with a glass tube with a gas outlet. The gas guide tube is ...

Embodiment 3

[0052] Take 1# chemical industry sulfonated salting-out filtrate for experimental research, the research process is as follows:

[0053] The first step is the step of removing mercury by diaphragm electrodeposition. The mercury concentration in the initial high-acidity chemical mercury-containing waste liquid is 11300mg / L, and the acid concentration is 31.50%. A vertical diaphragm electrolyzer is used. The diaphragm is a cation exchange membrane. The anode uses a 10mm graphite plate and the cathode uses a 1mm stainless steel plate. The cathode current density of diaphragm electrodeposition is 70A / m 2 , the same pole distance is 100mm, the additive thiourea is 0.6g / L, and the electrodeposition time is 70min. Cr 9.55×10 4 mg / L decreased to 3.6×10 4 mg / L or less, as shown in Table 2.

[0054] The second step is the step of continuous sulfidation and mercury removal. Seal the two jet tubes at the inlets on both sides of the three-necked flask. The hydrogen sulfide reactor is ...

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Abstract

The invention discloses a method and device for jointly removing mercury from high-acidity chemical mercury-containing waste acid liquid, and belongs to the field of mercury treatment. The device consists of a diaphragm electro-deposition unit, a continuous vulcanization mercury removal unit and an adsorption mercury removal unit which are connected in sequence and can realize continuous and efficient removal of the mercury in any form in the high-acidity mercury-containing waste acid liquid. According to the method disclosed by the invention, the mercury in the high-acidity mercury-containingwaste acid liquid can be continuously and rapidly removed by utilizing a diaphragm electrolytic deposition method-continuous vulcanization method-adsorbent mercury removal method combined process technology, so that the mercury is precipitated and removed in the form of metal mercury and mercury sulfide, and the mercury can be recycled after being collected; the electrolytic deposition method issmall in occupied area, environmentally friendly and free of pollution; organic mercury and inorganic mercury are precipitated out in the form of metal mercury finally, so that the mercury content ofthe high-acidity waste liquid can be effectively reduced; hydrogen sulfide gas produced by the continuous vulcanization method is hermetically circulated in a system with no pollution brought about; and the adsorbent mercury removal method can ensure deep purification of the waste liquid, which is more beneficial to the comprehensive utilization of the purified acid liquid.

Description

technical field [0001] The invention relates to the field of mercury treatment, in particular to a method and device for combined removal of mercury from high-acidity chemical waste acid liquid containing mercury. Background technique [0002] Mercury and its compounds have become priority control pollutants in China and the world due to their characteristics of biotoxicity, bioaccumulation, persistence, and long-distance transmission. my country is a big country in the production, use and discharge of mercury. The production and use of mercury account for about 60% of the global production and use respectively. The production and use of mercury will cause the discharge of mercury-containing waste. Mercury and its compounds discharged into water bodies form various forms of mercury through physical, chemical and biological actions, and even transform into highly toxic methyl compounds. The Minamata disease that occurred in Japan was caused by the pollution of waters by meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20
CPCC02F1/281C02F1/283C02F1/46104C02F1/5236C02F9/00C02F2101/20
Inventor 孙荣林梅云峰
Owner 唐山周行科技发展有限公司
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