CN103331094B - Method for purifying non ferrous metal smelting flue gas and realizing synchronized multiple resource utilization - Google Patents
Method for purifying non ferrous metal smelting flue gas and realizing synchronized multiple resource utilization Download PDFInfo
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Abstract
The invention relates to a method for purifying non ferrous metal smelting flue gas and realizing synchronized multiple resource utilization. The method is as below: using a composite absorption liquid comprising main components of mercury sulfate, sulfuric acid and iodine to carry out high efficiency absorption of sulfur dioxide and zero valent mercury in the non ferrous metal smelting; conversing sulfur dioxide into sulfuric acid through reaction with iodine, and conversing zero valent mercury into mercurous sulfate through reaction with mercury sulfate; and finally separating and decomposing the absorption liquid to recover generated sulfuric acid and zero, and simultaneously utilizing other methods to separate, purify and decompose the hydrogen iodide generated in the reaction process for hydrogen production. The method provided by the invention mainly carries out discharge control and recovery utilization of flue gas containing high-concentration sulfur dioxide and zero valent mercury in the non ferrous metal smelting industry, and realizes multiple resource.
Description
Technical field
The invention belongs to the air pollution control technique of field of environment protection, especially relate to a kind of purification of non-ferrous metal metallurgy flue gas and synchronously realize multiple resources Application way.
Background technology
As persistence toxic pollutant, mercury pollution problem is subject to the extensive concern in worldwide.United Nations Environment Programme (UNEP) is classified as mercury as global contaminant.In January, 2013 the United Nations's government-to-government talks committee have passed one legally binding " international control mercury pollution pact ", is intended to control in global range and reduce mercury emissions, to reduce the infringement that it causes environment and human health.As one of topmost mercury emissions state in the world, China will be faced with severe pressure of honouring an agreement.
In numerous artificial mercury emissions source, the discharge capacity of non-ferrous metal metallurgy mercury in flue gas accounts for very large proportion, is therefore the important industry of mercuric pollution treatment.The mercury control of current non-ferrous metal metallurgy flue gas mainly adopts the several methods such as condensation method, absorption method and absorption process.Wherein condensation method mercury removal efficiency is on the low side, generally can only as pre-removal of mercury technique.The mercury adsorption capacity of the material that absorption method is used is generally only the 10-15% of own wt, is suitable only for the flue gas that process mercury content is lower, is not suitable for the mercury process of non-ferrous metal metallurgy flue gas.Current, the mercury processing method of non-ferrous metal metallurgy flue gas is mainly absorption process, and the absorption process being wherein representative with mercury chloride removal of mercury method is again most widely used.But this technique exists some problems equally: first flue-gas temperature is first reduced to 30-40 degree scope by this technological requirement, thus absorption tower inlet flue gas mercury concentration is controlled at 30mg/m
3below absorb again, otherwise absorption efficiency can be caused obviously to decline, outlet mercury concentration exceedes discharge standard; The second, after the sulfur dioxide in non-ferrous metal metallurgy flue gas is absorbed, the Hg in the sulfite ion meeting Reducing and absorption liquid of generation
2+, thus reduce total demercuration efficiency; 3rd, the outlet mercury concentration of this technique is generally 0.1mg/m
3, more and more stricter mercury emissions standard cannot be met.In addition, due to the sulfur dioxide containing high concentration in non-ferrous metal metallurgy flue gas, the acid-making process that general needs need increase complicated after absorbing demercuration and equipment are for reducing discharge and the Resource recovery of sulfur dioxide.Current main employing double-absorption technique, also has and adopts the relieving haperacidity of three-conversion three-absorption technique.The acid-making process floor space adopted is large, complex process, operating cost are also higher, and the product of relieving haperacidity can contain certain density mercury, needs to remove further.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and provide one can improve mercury control and organic efficiency, reclaim high-concentration sulfur dioxide simultaneously, and realize the purification of the non-ferrous metal metallurgy flue gas of multiple resources and synchronously realize multiple resources Application way.
Object of the present invention can be achieved through the following technical solutions: a kind of purification of non-ferrous metal metallurgy flue gas and synchronously realize multiple resources Application way, and it is characterized in that, the method comprises following step:
The first step, is hybridly prepared into composite absorption liquid by mercuric sulfate, sulfuric acid, iodine and water and is stored in composite absorption liquid liquid pool;
Second step, passes in composite absorption liquid circulating slot by the composite absorption liquid V6 in composite absorption liquid liquid pool;
3rd step, composite absorption liquid in composite absorption liquid circulating slot is sprayed in smoke absorption tower and absorption trapping is carried out to the sulfur dioxide in flue gas and mercury, mercuric sulfate wherein in nonvalent mercury and composite absorption liquid reacts and generates mereurous sulfate, iodine in sulfur dioxide and composite absorption liquid and water react and generate sulfuric acid and hydrogen iodide, and the composite absorption liquid after gas-liquid contact recycles by passing at the bottom of tower in composite absorption liquid circulating slot;
4th step, the liquid V1 that partially absorbs wherein passes in composite absorption liquid separating apparatus after being reduced to and being less than 0.05mol/L by the ion concentration of mercury in absorbing liquid circulating slot to be composite, and the volume partially absorbing liquid V1 is the 20-50% of absorbing liquid volume in composite absorption liquid circulating slot;
5th step, is separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid by the composite absorption liquid entered in composite absorption liquid separating apparatus, and passes in hydrogen iodide absorbing liquid separator and sulfuric acid phase absorbing liquid separator respectively;
6th step, utilizes sulfuric acid phase absorbing liquid separator to be reclaimed by the sulfuric acid in absorbing liquid, and makes sulfuric acid product after purifying, and the liquid that partially absorbs of remainder passes in mereurous sulfate decomposer;
7th step, resolves into Elemental Mercury and mercuric sulfate absorbing liquid by the absorbing liquid in mereurous sulfate decomposer, wherein Elemental Mercury is purified reclaims afterwards as product, and mercuric sulfate absorbing liquid passes in composite absorption liquid liquid pool and recycles;
8th step, the absorbing liquid entered in hydrogen iodide absorbing liquid separator be separated into hydrogen iodide concentrate and contain iodine absorbing liquid, wherein hydrogen iodide concentrate passes in hydrogen iodide concentrate decomposer, and passes in composite absorption liquid liquid pool recycle containing iodine absorbing liquid;
9th step, is decomposed into hydrogen and Biodine by the hydrogen iodide entered in hydrogen iodide concentrate decomposer, wherein hydrogen purified concentrated after reclaim as product, and Biodine passes in composite absorption liquid liquid pool and recycles;
Tenth step, continues to pass into a certain amount of water V5 in composite absorption liquid liquid pool, to supplement the water consumed owing to preparing sulfuric acid.
The main component of described composite absorption liquid is mercuric sulfate, sulfuric acid, iodine and water, wherein the concentration of mercuric sulfate, sulfuric acid and iodine is respectively: 0.1-0.5mol/L, 0.6-3.0mol/L and 0.05-2.0mol/L, the temperature of composite absorption liquid maintains within the scope of 30-60 degree.
Described smoke absorption tower is packed tower, spray column or plate column, and the liquid-gas ratio scope of spray-absorption is: 1-10L/m
3, the temperature range passing into the non-ferrous metal metallurgy flue gas of smoke absorption tower is 30-60 degree.
Described composite absorption liquid separating apparatus is membrane separation device or extraction separation device, absorbing liquid can be separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid.
Described sulfuric acid phase absorbing liquid separator is membrane separation device or extraction separation device, sulfuric acid phase absorbing liquid can be separated mereurous sulfate absorbing liquid and sulfuric acid product.
Described mereurous sulfate absorbing liquid decomposer is light decomposer or electrochemical decomposition device, mereurous sulfate can be decomposed into Elemental Mercury and mercuric sulfate.
Described hydrogen iodide absorbing liquid separator is membrane separation device or extraction separation device, hydrogen iodide absorbing liquid can be separated into hydrogen iodide concentrate and contain iodine absorbing liquid.
Described hydrogen iodide concentrate decomposer is light decomposer or electrochemical decomposition device, the hydrogen iodide in hydrogen iodide concentrate can be decomposed into hydrogen and Biodine.
The volume being passed into the composite absorption liquid V6 of composite absorption liquid circulating slot from composite absorption liquid liquid pool be passed into from composite absorption liquid circulating slot composite absorption liquid separating apparatus to partially absorb liquid V1 volume equal, i.e. V6=V1.
A certain amount of water V5 is passed in composite absorption liquid liquid pool, the volume that wherein volume of supplementing water V5 equals to pass into from composite absorption liquid liquid pool the composite absorption liquid V6 of composite absorption liquid circulating slot deducts respectively from mereurous sulfate absorbing liquid decomposer, hydrogen iodide absorbing liquid separator and hydrogen iodide concentrate decomposer defeated liquor capacity V2, V3 and the V4 be back to composite absorption liquid liquid pool, i.e. V5=V6-V2-V3-V4.
The main chemical reactions process that whole technological process relates to has:
The absorption reaction process of sulfur dioxide and mercury:
Hg+HgSO
4＝Hg
2SO
4
SO
2+ I
2+ 2H
2o=2HI+H
2sO
4(Bunsen reaction)
The decomposition reaction process of mereurous sulfate:
Hg
2SO
4＝Hg+HgSO
4
The decomposition reaction process of hydrogen iodide:
HI＝H
2+I
2
Compared with existing absorption process demercuration technology, the present invention has following advantages:
1, the present invention utilizes mercuric sulfate to be absorbed with mercury in non-ferrous metal flue gas during smelting, also can have higher absorption efficiency, can ensure the qualified discharge of outlet mercury concentration under low concentration absorbing liquid condition;
2, the present invention utilizes the preparing sulfuric acid by using sulfur dioxide in Bunsen reactive absorption non-ferrous metal metallurgy flue gas, not only can by the sulfur dioxide recycling in flue gas, save the Processes and apparatus of follow-up relieving haperacidity, by by quick for the sulfur dioxide in flue gas sorption enhanced, sulfite ion can also be decreased to Hg in absorbing liquid
2+the reduction reaction of ion, substantially increases the removal efficiency of total mercury.
3, the present invention is by decomposition to hydrogen iodide, can prepare hydrogen, by preparing high-concentration sulfur dioxide in the form recovered flue gas of sulfuric acid and Elemental Mercury and mercury, can achieve the object of multiple resources in addition.
4, the sulfuric acid, mercuric sulfate and the iodine that generate in course of reaction of the present invention can pass in absorbing liquid liquid pool and recycle, and except needs supplementing water, do not need other running stores, greatly reduce operating cost.
In a word, the present invention, except the removal of the sulfur dioxide and mercury that are applicable to non-ferrous metal metallurgy flue gas and resource, is applicable to other and contains the sulfur dioxide of the industrial smoke of high-concentration sulfur dioxide and mercury and the emission control of mercury and recycling equally.
Accompanying drawing explanation
Fig. 1 is the process schematic representation that the present invention adopts.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described.
Below embodiments of the invention are described in detail: the present embodiment is implemented under with technical solution of the present invention prerequisite, give detailed embodiment and specific operation process, but protection scope of the present invention is not limited to following embodiment.
Main purpose of the present invention is that the sulfur dioxide in non-ferrous metal metallurgy flue gas and mercury are synchronously removed and reclaimed, and carries out disintegrant hydrogen, realize the object of multiple resources additionally by the hydrogen iodide generated in course of reaction.In the implementation process of the present invention program, emphasis is to realize the efficient absorption of gas mercury and sulfur dioxide for target.
Embodiment 1
Utilize glass bubble absorption device that a volume is 500mL as reactor, reactor is built with 250mL absorbing liquid.Absorbing liquid take distilled water as solvent, and key component and concentration are respectively: mercuric sulfate (1.48g/L), sulfuric acid (49g/L), iodine (127g/L).In reactor, pass into nonvalent mercury concentration is 3mg/m
3simulated flue gas, flue gas flow controls at 1L/min, and temperature of reaction system maintains about 25 degree.By monitoring the nonvalent mercury in tail gas, result shows that the nonvalent mercury concentration in tail gas maintains 30 μ g/m substantially
3left and right, calculates nonvalent mercury removal efficiency thus and is about about 99.0%.In reactor, pass into sulfur dioxide concentration is 3mg/m
3simulated flue gas, flue gas flow and temperature still control at about 1L/min and 25 degree respectively, and by detecting the sulfur dioxide concentration in tail gas, result shows that the sulfur dioxide concentration in tail gas remains on 75mg/m substantially
3, the removal efficiency calculating sulfur dioxide is thus about 97.5%.
Embodiment 2
Utilize an internal diameter to be 100mm, the glass wet scrubber tower of long 1200mm carries out pilot plant test as reactor.Composite absorption liquid take distilled water as solvent, and key component and concentration are respectively: mercuric sulfate (2.96g/L), sulfuric acid (98g/L), iodine (254g/L).Passed into by simulated flue gas in wet scrubber tower, exhaust gas volumn is 2m
3/ h, temperature is 25 degree.In wet scrubber tower, spray into composite absorption liquid by multilayer atomizer, the straying quatity of absorbing liquid is 10L/h simultaneously, and the liquid-gas ratio of reaction system is 5L/m
3.Nonvalent mercury content in simulated flue gas is 2mg/m
3, sulfur dioxide concentration is 8000mg/m
3.Monitor the tail gas by wet scrubber tower, result shows that in tail gas, the content of nonvalent mercury is about 12 μ g/m
3, sulfur dioxide concentration is 120mg/m
3.Removal efficiency through calculating nonvalent mercury is about 99.4%, and the removal efficiency of sulfur dioxide is about 98.5%.
Embodiment 3
As shown in Figure 1, a kind of purification of non-ferrous metal metallurgy flue gas and synchronously realize multiple resources Application way, the method comprises following step:
The first step, is hybridly prepared into composite absorption liquid by mercuric sulfate, sulfuric acid, iodine and water and is stored in composite absorption liquid liquid pool 8; The main component of described composite absorption liquid is mercuric sulfate, sulfuric acid, iodine and water, and wherein the concentration of mercuric sulfate, sulfuric acid and iodine is respectively: 0.1mol/L, 0.6mol/L and 0.05mol/L, and the temperature of composite absorption liquid maintains within the scope of 30-60 degree.
Second step, passes in composite absorption liquid circulating slot 2 by the composite absorption liquid V6 in composite absorption liquid liquid pool 8;
3rd step, composite absorption liquid in composite absorption liquid circulating slot 2 is sprayed in smoke absorption tower 1 and absorption trapping is carried out to the sulfur dioxide in flue gas and mercury, mercuric sulfate wherein in nonvalent mercury and composite absorption liquid reacts and generates mereurous sulfate, iodine in sulfur dioxide and composite absorption liquid and water react and generate sulfuric acid and hydrogen iodide, and the composite absorption liquid after gas-liquid contact recycles by passing at the bottom of tower in composite absorption liquid circulating slot 2; Described smoke absorption tower 1 is spray column, and the liquid-gas ratio scope of spray-absorption is: 1-10L/m
3, the temperature range passing into the non-ferrous metal metallurgy flue gas of smoke absorption tower 1 is 30-60 degree.
4th step, the liquid V1 that partially absorbs wherein passes in composite absorption liquid separating apparatus 3 after being reduced to and being less than 0.05mol/L by the ion concentration of mercury in absorbing liquid circulating slot 2 to be composite, and the volume partially absorbing liquid V1 is 20% of absorbing liquid volume in composite absorption liquid circulating slot 2;
5th step, is separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid by the composite absorption liquid entered in composite absorption liquid separating apparatus 3, and passes in hydrogen iodide absorbing liquid separator 6 and sulfuric acid phase absorbing liquid separator 4 respectively; Absorbing liquid can be separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid for membrane separation device by described composite absorption liquid separating apparatus 3.
6th step, utilizes sulfuric acid phase absorbing liquid separator 4 to be reclaimed by the sulfuric acid in absorbing liquid, and makes sulfuric acid product after purifying, and the liquid that partially absorbs of remainder passes in mereurous sulfate decomposer 5; Described sulfuric acid phase absorbing liquid separator 4 is membrane separation device, sulfuric acid phase absorbing liquid can be separated mereurous sulfate absorbing liquid and sulfuric acid product.
7th step, resolves into Elemental Mercury and mercuric sulfate absorbing liquid by the absorbing liquid in mereurous sulfate decomposer 5, wherein Elemental Mercury is purified reclaims afterwards as product, and mercuric sulfate absorbing liquid passes in composite absorption liquid liquid pool 8 and recycles; Described mereurous sulfate absorbing liquid decomposer 5 is light decomposer, mereurous sulfate can be decomposed into Elemental Mercury and mercuric sulfate.
8th step, the absorbing liquid entered in hydrogen iodide absorbing liquid separator 6 be separated into hydrogen iodide concentrate and contain iodine absorbing liquid, wherein hydrogen iodide concentrate passes in hydrogen iodide concentrate decomposer 7, and passes in composite absorption liquid liquid pool 8 recycle containing iodine absorbing liquid; Described hydrogen iodide absorbing liquid separator 6 is membrane separation devices, hydrogen iodide absorbing liquid can be separated into hydrogen iodide concentrate and contain iodine absorbing liquid.
9th step, is decomposed into hydrogen and Biodine by the hydrogen iodide entered in hydrogen iodide concentrate decomposer 7, wherein hydrogen purified concentrated after reclaim as product, and Biodine passes in composite absorption liquid liquid pool 8 and recycles; Described hydrogen iodide concentrate decomposer 7 is light decomposers, the hydrogen iodide in hydrogen iodide concentrate can be decomposed into hydrogen and Biodine.
Tenth step, continues to pass into a certain amount of water V5 in composite absorption liquid liquid pool 8, to supplement the water consumed owing to preparing sulfuric acid.
The volume being passed into the composite absorption liquid V6 of composite absorption liquid circulating slot 2 from composite absorption liquid liquid pool 8 be passed into from composite absorption liquid circulating slot 2 composite absorption liquid separating apparatus 3 to partially absorb liquid V1 volume equal, i.e. V6=V1.
A certain amount of water V5 is passed in composite absorption liquid liquid pool 8, the volume that wherein volume of supplementing water V5 equals to pass into from composite absorption liquid liquid pool 8 the composite absorption liquid V6 of composite absorption liquid circulating slot 2 deducts respectively from mereurous sulfate absorbing liquid decomposer 5, hydrogen iodide absorbing liquid separator 6 and hydrogen iodide concentrate decomposer 7 defeated liquor capacity V2, V3 and the V4 be back to composite absorption liquid liquid pool 8, i.e. V5=V6-V2-V3-V4.
Embodiment 4
Shown in 1, a kind of purification of non-ferrous metal metallurgy flue gas and synchronously realize multiple resources Application way, the method comprises following step:
The first step, is hybridly prepared into composite absorption liquid by mercuric sulfate, sulfuric acid, iodine and water and is stored in composite absorption liquid liquid pool 8; The main component of described composite absorption liquid is mercuric sulfate, sulfuric acid, iodine and water, and wherein the concentration of mercuric sulfate, sulfuric acid and iodine is respectively: 0.5mol/L, 3.0mol/L and 2.0mol/L, and the temperature of composite absorption liquid maintains within the scope of 30-60 degree.
Second step, passes in composite absorption liquid circulating slot 2 by the composite absorption liquid V6 in composite absorption liquid liquid pool 8;
3rd step, composite absorption liquid in composite absorption liquid circulating slot 2 is sprayed in smoke absorption tower 1 and absorption trapping is carried out to the sulfur dioxide in flue gas and mercury, mercuric sulfate wherein in nonvalent mercury and composite absorption liquid reacts and generates mereurous sulfate, iodine in sulfur dioxide and composite absorption liquid and water react and generate sulfuric acid and hydrogen iodide, and the composite absorption liquid after gas-liquid contact recycles by passing at the bottom of tower in composite absorption liquid circulating slot 2; Described smoke absorption tower 1 is packed tower, and liquid-gas ratio scope is: 1-10L/m
3, the temperature range passing into the non-ferrous metal metallurgy flue gas of smoke absorption tower 1 is 30-60 degree.
4th step, the liquid V1 that partially absorbs wherein passes in composite absorption liquid separating apparatus 3 after being reduced to and being less than 0.05mol/L by the ion concentration of mercury in absorbing liquid circulating slot 2 to be composite, and the volume partially absorbing liquid V1 is 50% of absorbing liquid volume in composite absorption liquid circulating slot 2;
5th step, is separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid by the composite absorption liquid entered in composite absorption liquid separating apparatus 3, and passes in hydrogen iodide absorbing liquid separator 6 and sulfuric acid phase absorbing liquid separator 4 respectively; Described composite absorption liquid separating apparatus 3 is extraction separation device, absorbing liquid can be separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid.
6th step, utilizes sulfuric acid phase absorbing liquid separator 4 to be reclaimed by the sulfuric acid in absorbing liquid, and makes sulfuric acid product after purifying, and the liquid that partially absorbs of remainder passes in mereurous sulfate decomposer 5; Described sulfuric acid phase absorbing liquid separator 4 is extraction separation device, sulfuric acid phase absorbing liquid can be separated mereurous sulfate absorbing liquid and sulfuric acid product.
7th step, resolves into Elemental Mercury and mercuric sulfate absorbing liquid by the absorbing liquid in mereurous sulfate decomposer 5, wherein Elemental Mercury is purified reclaims afterwards as product, and mercuric sulfate absorbing liquid passes in composite absorption liquid liquid pool 8 and recycles; Described mereurous sulfate absorbing liquid decomposer 5 is electrochemical decomposition device, mereurous sulfate can be decomposed into Elemental Mercury and mercuric sulfate.
8th step, the absorbing liquid entered in hydrogen iodide absorbing liquid separator 6 be separated into hydrogen iodide concentrate and contain iodine absorbing liquid, wherein hydrogen iodide concentrate passes in hydrogen iodide concentrate decomposer 7, and passes in composite absorption liquid liquid pool 8 recycle containing iodine absorbing liquid; Described hydrogen iodide absorbing liquid separator 6 is extraction separation devices, hydrogen iodide absorbing liquid can be separated into hydrogen iodide concentrate and contain iodine absorbing liquid.
9th step, is decomposed into hydrogen and Biodine by the hydrogen iodide entered in hydrogen iodide concentrate decomposer 7, wherein hydrogen purified concentrated after reclaim as product, and Biodine passes in composite absorption liquid liquid pool 8 and recycles; Described hydrogen iodide concentrate decomposer 7 is electrochemical decomposition devices, the hydrogen iodide in hydrogen iodide concentrate can be decomposed into hydrogen and Biodine.
Tenth step, continues to pass into a certain amount of water V5 in composite absorption liquid liquid pool 8, to supplement the water consumed owing to preparing sulfuric acid.
The volume being passed into the composite absorption liquid V6 of composite absorption liquid circulating slot 2 from composite absorption liquid liquid pool 8 be passed into from composite absorption liquid circulating slot 2 composite absorption liquid separating apparatus 3 to partially absorb liquid V1 volume equal, i.e. V6=V1.
A certain amount of water V5 is passed in composite absorption liquid liquid pool 8, the volume that wherein volume of supplementing water V5 equals to pass into from composite absorption liquid liquid pool 8 the composite absorption liquid V6 of composite absorption liquid circulating slot 2 deducts respectively from mereurous sulfate absorbing liquid decomposer 5, hydrogen iodide absorbing liquid separator 6 and hydrogen iodide concentrate decomposer 7 defeated liquor capacity V2, V3 and the V4 be back to composite absorption liquid liquid pool 8, i.e. V5=V6-V2-V3-V4.
Claims (10)
1. non-ferrous metal metallurgy flue gas purification and synchronously realize a multiple resources Application way, it is characterized in that, the method comprises following step:
The first step, is hybridly prepared into composite absorption liquid by mercuric sulfate, sulfuric acid, iodine and water and is stored in composite absorption liquid liquid pool (8);
Second step, passes into the composite absorption liquid in composite absorption liquid liquid pool (8) in composite absorption liquid circulating slot (2);
3rd step, composite absorption liquid in composite absorption liquid circulating slot (2) is sprayed in smoke absorption tower (1) and absorption trapping is carried out to the sulfur dioxide in flue gas and mercury, mercuric sulfate wherein in nonvalent mercury and composite absorption liquid reacts and generates mereurous sulfate, iodine in sulfur dioxide and composite absorption liquid and water react and generate sulfuric acid and hydrogen iodide, and the composite absorption liquid after gas-liquid contact recycles by passing at the bottom of tower in composite absorption liquid circulating slot (2);
4th step, the liquid that partially absorbs wherein passes in composite absorption liquid separating apparatus (3) after being reduced to and being less than 0.05mol/L by the ion concentration of mercury in absorbing liquid circulating slot (2) to be composite, and the volume partially absorbing liquid is the 20-50% of absorbing liquid volume in composite absorption liquid circulating slot (2);
5th step, the composite absorption liquid entered in composite absorption liquid separating apparatus (3) is separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid, and passes in hydrogen iodide absorbing liquid separator (6) and sulfuric acid phase absorbing liquid separator (4) respectively;
6th step, utilizes sulfuric acid phase absorbing liquid separator (4) to be reclaimed by the sulfuric acid in absorbing liquid, and makes sulfuric acid product after purifying, and the liquid that partially absorbs of remainder passes in mereurous sulfate decomposer (5);
7th step, absorbing liquid in mereurous sulfate decomposer (5) is resolved into Elemental Mercury and mercuric sulfate absorbing liquid, wherein Elemental Mercury is purified reclaims afterwards as product, and mercuric sulfate absorbing liquid passes in composite absorption liquid liquid pool (8) and recycles;
8th step, the absorbing liquid entered in hydrogen iodide absorbing liquid separator (6) be separated into hydrogen iodide concentrate and contain iodine absorbing liquid, wherein hydrogen iodide concentrate passes in hydrogen iodide concentrate decomposer (7), and passes in composite absorption liquid liquid pool (8) recycle containing iodine absorbing liquid;
9th step, the hydrogen iodide entered in hydrogen iodide concentrate decomposer (7) is decomposed into hydrogen and Biodine, wherein hydrogen purified concentrated after reclaim as product, and Biodine passes in composite absorption liquid liquid pool (8) and recycles;
Tenth step, continues to pass into a certain amount of water in composite absorption liquid liquid pool (8), to supplement the water consumed owing to preparing sulfuric acid.
2. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, the main component of described composite absorption liquid is mercuric sulfate, sulfuric acid, iodine and water, wherein the concentration of mercuric sulfate, sulfuric acid and iodine is respectively: 0.1-0.5mol/L, 0.6-3.0mol/L and 0.05-2.0mol/L, the temperature of composite absorption liquid maintains within the scope of 30-60 degree.
3. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, described smoke absorption tower (1) is packed tower, spray column or plate column, and the liquid-gas ratio scope of spray-absorption is: 1-10L/m
3, the temperature range passing into the non-ferrous metal metallurgy flue gas of smoke absorption tower (1) is 30-60 degree.
4. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, described composite absorption liquid separating apparatus (3) is membrane separation device or extraction separation device, absorbing liquid can be separated into hydrogen iodide absorbing liquid and sulfuric acid phase absorbing liquid.
5. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, described sulfuric acid phase absorbing liquid separator (4) is membrane separation device or extraction separation device, sulfuric acid phase absorbing liquid can be separated mereurous sulfate absorbing liquid and sulfuric acid product.
6. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, described mereurous sulfate absorbing liquid decomposer (5) is light decomposer or electrochemical decomposition device, mereurous sulfate can be decomposed into Elemental Mercury and mercuric sulfate.
7. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, described hydrogen iodide absorbing liquid separator (6) is membrane separation device or extraction separation device, hydrogen iodide absorbing liquid can be separated into hydrogen iodide concentrate and contain iodine absorbing liquid.
8. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, described hydrogen iodide concentrate decomposer (7) is light decomposer or electrochemical decomposition device, the hydrogen iodide in hydrogen iodide concentrate can be decomposed into hydrogen and Biodine.
9. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, be passed into the volume of the composite absorption liquid of composite absorption liquid circulating slot (2) with the liquid that partially absorbs be passed into composite absorption liquid separating apparatus (3) amasss equal from composite absorption liquid circulating slot (2) from composite absorption liquid liquid pool (8).
10. a kind of non-ferrous metal metallurgy flue gas according to claim 1 purification and synchronously realize multiple resources Application way, it is characterized in that, a certain amount of water is passed in composite absorption liquid liquid pool (8), the volume that wherein volume of supplementing water equals to pass into from composite absorption liquid liquid pool (8) the composite absorption liquid of composite absorption liquid circulating slot (2) deducts respectively from mereurous sulfate absorbing liquid decomposer (5), hydrogen iodide absorbing liquid separator (6) and the defeated liquor capacity be back in composite absorption liquid liquid pool (8) of hydrogen iodide concentrate decomposer (7).
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| CN103331094A (en) | 2013-10-02 |
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