Method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury

A recovery rate, divalent mercury technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as difficult recycling of mercury and sulfur, secondary pollution, high operating costs, etc., to achieve an increase in total mercury Effects of recovery rate, increased equipment cost, and waste treatment cost savings

Active Publication Date: 2012-09-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of activated carbon is used, resulting in high operating costs; the generated HgS is difficult to recycle mercury and sulfur; if it is not disposed of properly, it may cause secondary pollution

Method used

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  • Method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury
  • Method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A glass bubbling device with a volume of 500 mL was used as the main reactor, and the liquid volume in the reactor was kept at about 250 mL. (1) Add 250mL concentration of mercuric chloride solution that is 100mg / L in the reactor; Inject 10mL concentration and be 184mM / L sodium sulfite solution in the reactor; Air flow is controlled at 1L / min, after 20 minutes of reaction, react Determination of Hg of the solution in the vessel with a cold atomic absorption mercury analyzer 2+ The remaining amount, according to which the reduced Hg is calculated 2+ Quantity and reduction rate; tail gas is absorbed with 5% potassium permanganate solution; the total power of the device is provided by the air pump. After adopting the above method, Hg 2+ The reduction rate can be 85% or above. (2) Under the same mercuric chloride solution condition, inject 1mL concentration into the solution and be 184mM / L sodium sulfite solution, after 30 minutes of reaction, measure Hg 2+ The remainin...

Embodiment 2

[0038] Utilize an internal diameter of 100mm, a long 1200mm plexiglass material wet scrubber as the main reactor, (1) add 800mL concentration of mercuric chloride solution that is 100mg / L in the reactor; The spray concentration is 1.84mM / L sodium sulfite solution for 20 minutes; after 20 minutes of reaction, the solution in the reactor is measured with a cold atomic absorption mercury meter to measure Hg 2+ The remaining amount, according to which the reduced Hg is calculated 2+ Amount and reduction rate; tail gas is absorbed with 5% potassium permanganate. After adopting the above method, Hg 2+ The reduction rate can be 85% or above. (2) Add 800mL concentration of mercuric chloride solution that is 100mg / L in the reactor; Spray concentration is 0.7mM / L sodium sulfite and 1.2mM / L sodium bisulfite mixed solution 20 in the reactor with the flow rate of 160mL / min Minutes; After 20 minutes of reaction, the solution in the reactor was measured with a cold atomic absorption mercu...

Embodiment 3

[0040] Using sulfite (SO 3 2- ), bisulfite (HSO 3 - ) or a mixture of the two, divalent mercury (Hg 2+ ) is reduced to zero-valent mercury (Hg 0 ) method, device such as figure 1 As shown, it specifically includes the following steps:

[0041] 1. Distribute one flue gas from the flue gas system, pass it from the diverted flue gas inlet 1 into the NaOH washing tower 2 (dilute NaOH is the detergent), and use the pump 4 to spray the NaOH washing liquid from the NaOH storage tank 3 into the NaOH scrubber 2 to make the SO in the flue gas 2 React with NaOH to produce SO 3 2- 、HSO 3 - or a mixture of both.

[0042] 2. The split flue gas enters the main flue gas pipeline from the outlet 6 of the NaOH scrubber 2, and the SO in the NaOH scrubber 2 3 2- 、HSO 3 - Or the mixed solution of the two is transported in the acid liquid washing liquid tank 10 by pump 5;

[0043] 3. The main flue gas enters the pickling tower 8 from the inlet 7, and uses the pump 9 to spray the was...

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Abstract

The invention relates to a method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury, which comprises steps as follows: (1) metallurgical fume discharged from a fume system is divided into two ways, the first way of fume directly enters an acid washing column, and the second way of fume is introduced into a sodium hydroxide washing column, so that SO2 in the fume reacts with NaOH to generate a solution of SO3<2-> or HSO3<-> or both; (2) the solution of SO3<2-> or HSO3<-> or both generated in the step (1) is introduced into the acid washing column as a reducer, wherein the introduction amount of the reducer is controlled, so that the mol ratio of the SO3<2-> or HSO3<-> concentration to the Hg<2+> concentration in the washing liquid in the acid washing column is kept within the range of 0.8-5000; and (3) the Hg<2+> in the acid washing column is directed reduced into HgO by the SO3<2-> or HSO3<-> in the reducer, and the HgO enters a subsequent mercury absorption column to be recycled through an exhaust port along with the fume. Compared with the prior art, the invention can greatly enhance the total mercury recovery rate of non-ferrous smelting fume, thereby achieving the goal of removing and recovering fume mercury more efficiently.

Description

technical field [0001] The invention belongs to the non-ferrous metal smelting flue gas mercury emission control and recovery technology in the field of environmental protection, and relates to a method for reducing divalent mercury to improve the recovery rate of total mercury in metallurgical flue gas, using sulfite (SO 3 2- ), bisulfite (HSO 3 - ) or a mixture of the two to reduce the divalent mercury in the pickling tower to zero-valent mercury, so as to improve the recovery rate of total mercury in the subsequent flue gas zero-valent mercury recovery device (Poliden absorption tower, etc.). Background technique [0002] As we all know, mercury is a toxic pollutant with persistence, easy migration, high bioaccumulation, and strong toxicity. It is not only very harmful to the ecological environment, but also directly or indirectly harmful to human health. The "Minamata disease" incident that broke out in Japan in the 1950s and 1960s was a serious mercury pollution dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/64
Inventor 瞿赞晏乃强马永鹏姚女胡林刚
Owner SHANGHAI JIAO TONG UNIV
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