Method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy

A technology for non-ferrous metals and smelting flue gas, which is applied in the field of smelting flue gas treatment. It can solve the problems of high environmental pollution hazards, waste of mercury resources, and high cost of external transportation, so as to improve the efficiency of condensation collection and recovery, reduce production costs, and avoid pollution. Effect

Active Publication Date: 2018-07-24
湖南西林环保材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the existing non-ferrous metal smelting flue gas, the efficiency of mercury removal is not high, and the mercury-containing acid mud obtained from mercury removal is difficult to handle, the hidden danger of environmental pollution during stacking, the potential environmental pollution risk during the process of external transportation, the high cost of external transportation, The purpose of this invention is to provide a method for in-situ recovery of mercury in non-ferrous metal smelting mercury-containing flue gas. The method is simple to operate, low in cost, high in mercury collection and recovery efficiency, and can The nearby construction of mercury-containing flue gas generation area avoids the difficulty of removing mercury from mercury-containing flue gas and the risk of environmental pollution in the process and transportation of mercury-containing acid mud, and the tail gas containing trace amounts of mercury can be reintroduced into non-ferrous metal smelting. In the mercury flue gas purification system, there is no need to build a special tail gas treatment device, which can effectively avoid secondary pollution. The method is simple and can be used on a large scale

Method used

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  • Method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy
  • Method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy
  • Method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy

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Experimental program
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Effect test

Embodiment 1

[0050] (1) Add mercury removal slurry containing melamine polymer material mercury removal agent (mass percentage concentration is about 11%) into the purification system, the slurry circulates in the purification system, and passes through the mercury removal agent at a temperature of about 100°C The chelation reaction with mercury captures and solidifies the mercury in the flue gas, and the purification efficiency can reach more than 90%.

[0051] (2) Through the detection of the amount of slurry taken, when the mercury content of the mercury removal agent reaches more than 5%, the amount of mercury-containing sewage sludge drawn from the purification system is about 0.5m 3 , The measured solid content was 11.8%.

[0052] (3) After the flocculation and concentration reaction, the concentrated mercury-containing acid mud is dehydrated to obtain 140 kg of mercury-containing sludge, and the measured moisture content is 60.0%. The mercury content in the dry residue is 6.02%.

...

Embodiment 2

[0062] (1) Add mercury removal slurry containing melamine polymer material mercury removal agent (mass percentage concentration is about 11%) into the purification system, the slurry circulates in the purification system, and passes through the mercury removal agent at a temperature of about 50°C The chelation reaction with mercury captures and solidifies the mercury in the flue gas, and the purification efficiency can reach more than 90%.

[0063] (2) Through the detection of the amount of slurry, when the mercury content of the mercury removal agent reaches more than 10%, the amount of mercury-containing acid sludge drawn from the mercury removal system is about 0.5m 3 , Solid content 12.5%.

[0064](3) After flocculation and concentration reaction, the concentrated mercury-containing acid mud is dehydrated to obtain 153.6 kg of mercury-containing sludge, and the moisture content is about 59.3%. The mercury content in the dry residue is 10.72%.

[0065] (4) Mix the mercury...

Embodiment 3

[0074] (1) Add mercury removal slurry containing melamine polymer material mercury removal agent (mass percentage concentration is about 11%) into the purification system, the slurry circulates in the purification system, and passes through the mercury removal agent at a temperature of about 150°C The chelation reaction with mercury captures and solidifies the mercury in the flue gas, and the purification efficiency can reach more than 90%.

[0075] (2) Through the detection of the amount of slurry taken, when the mercury content reaches more than 20%, the amount of mercury-containing acid sludge drawn from the mercury removal system is about 0.5m 3 , Solid content 10.5%.

[0076] (3) After the flocculation and concentration reaction, the concentrated mercury-containing acid mud was dehydrated to obtain 130.9 kg of mercury-containing sludge, and the moisture content was measured to be about 61.1%. The mercury content in the dry residue is 25.33%.

[0077] (4) Mix mercury-con...

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Abstract

The invention discloses a method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy. The method comprises the following steps: performing absorption and mercury removal on mercury fume to obtain mercury-containing acid mud, and performing flocculation concentration and dehydration on the mercury-containing acid mud to obtain mercury-containing mud residues; pre-treating the mercury-containing mud, performing incineration, and recovering liquid mercury in a centralized manner by virtue of a multistage mercury condensation and collection device. The method is simple, low in cost, small in occupied area and high in efficiency of collecting and recovering the metal mercury, construction can be performed nearby a mercury fume production area of non-ferrous metal metallurgy, and environmental risk existing in the process of shipping out and treating the mercury-containing acid mud and during transportation can be avoided. Moreover, tail gases containing trace mercury can be introduced into a mercury fume purification system in non-ferrous metal metallurgy to be subjected to mercury removal again, a special tail gas treatment device does not need to be constructed, secondary pollution is effectively prevented from being avoided, and the method is simple and can be used on a large scale.

Description

technical field [0001] The invention relates to a method for treating mercury-containing flue gas from non-ferrous metal smelting, in particular to a non-ferrous metal smelting flue gas that absorbs and enriches mercury, flocculates, concentrates and dehydrates, pretreats, incinerates to form mercury vapor, condenses into liquid mercury and collects it. The recovery method belongs to the technical field of smelting flue gas treatment. Background technique [0002] Metallic mercury is one of the major heavy metal pollutants that are very harmful to the environment and organisms, including humans. It can accumulate in organisms. In addition to being directly harmed by its pollution, humans can also pass through the food chain such as Living things such as fish contaminated by mercury are indirectly poisoned by mercury pollution. The main harm to the human body is to affect the human brain and nervous system. Therefore, the prevention and treatment of heavy metal mercury pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/64C22B43/00C22B7/02
CPCB01D53/64B01D53/80B01D2257/602B01D2258/0283C22B7/02C22B43/00Y02P10/20
Inventor 王平山王定华
Owner 湖南西林环保材料有限公司
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