CN102698575A - Sintering flue gas desulfurizing agent and preparation method thereof - Google Patents
Sintering flue gas desulfurizing agent and preparation method thereof Download PDFInfo
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- CN102698575A CN102698575A CN2012101398197A CN201210139819A CN102698575A CN 102698575 A CN102698575 A CN 102698575A CN 2012101398197 A CN2012101398197 A CN 2012101398197A CN 201210139819 A CN201210139819 A CN 201210139819A CN 102698575 A CN102698575 A CN 102698575A
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Abstract
The invention discloses a sintering flue gas desulfurizing agent and a preparation method thereof. The sintering flue gas desulfurizing agent is prepared from steel slag tail sludge and lime kiln dust removal ash, wherein in the steel slag tail sludge, the content of CaO is 40-60 wt%, and the content of Al2O3 is 0-15 wt%; in the lime kiln dust removal ash, the content of CaO is 60-80 wt%; and the content of CaO in the steel slag tail sludge/lime kiln dust removal ash mixture is 60-70 wt%. The preparation method of the sintering flue gas desulfurizing agent comprises the following steps: carrying out magnetic separation on the converter steel slag; pulverizing the steel slag in a ball mill; detecting weight percents of all components in the steel slag tail sludge and lime kiln dust removal ash; and mixing the steel slag tail sludge and the lime kiln dust removal ash, and stirring. The novel desulfurizing agent prepared by the method disclosed by the invention can completely substitute quicklime as the raw material of the calcium-base desulfurizing process to lower the operating cost of the sintering flue gas desulfurizing system and reduce the generation of CO2, thereby reducing the steel slag accumulation and dust removal ash accumulation, achieving the goal of treating waste with waste and having high economic, environmental and social benefits.
Description
Technical field
The present invention relates to desulfurizing agent, specifically a kind of sintering flue gas desulfurization agent and preparation method thereof.
Background technology
China put into operation or the desulfurizer built in, according to the desulfurizing byproduct classification, the sulfur removal technology of employing mainly is divided three classes:
(1) " calcium base method " sulfur removal technology of by-product desulfurization slag.Use at present at most, domestic have 32 tame enterprises approximately.Concrete technology has kind surplus recirculating fluidized bed (LJS), dense-phase tower, rotating spraying (SDA), MEROS, NID, GSCA, the ENS etc. 10, is desulfurizing agent with quick lime, needs to consume a large amount of limestone resources.Accessory substance is the mixture of calcium chloride, calcirm-fluoride, calcium sulfite, gypsum etc., is difficult to resource at present utilize again, causes the stacking secondary pollution.Calcined limestone is produced a large amount of CO of discharging in desulfurizing agent (quick lime) process
2, do not meet the demand for development of national low-carbon economy.
(2) " ammonia-ammonia sulfate method " sulfur removal technology of producing ammonium sulfate byproduct is a desulfurizing agent with ammoniacal liquor.Domestic have 9 tame enterprises
approximately.The a large amount of NH of " ammonia-ammonia sulfate method " sulfur removal technology consumption
3, NH
3It is serious to escape, and discharged gas fume " is braved the rain ".Possibly contain heavy metal 、 bioxin etc. in the ammonium sulfate of by-product, can not be used for agrochemical and get into food chain (secondary pollution).Moreover China's nitrogenous fertilizer is seriously superfluous, and agriculture excessive applied nitrogen has caused serious pollution of area source.
(3) by-product sulfuric acid (H
2SO
4) sulfur removal technology, reclaim SO
2Gas by-product sulfuric acid.
Calcium base method sulfur removal technology is in service, and the cost of desulfurizing agent has accounted for the significant proportion of flue gas desulfurization operating cost.Desulfurizing agent is with high costs, the low bottleneck that has become the desulfur technology development of restriction China of desulfurizing byproduct value, and therefore, developing low-cost, high efficiency, the wide desulfurizing agent in source have become the emphasis of desulfurization industry broad research.
In the iron and steel enterprise, processes such as sintering, ironmaking, steel-making all need consume a large amount of quick limes, can produce large quantities of lime kiln dedusting ash in the quick lime production process, and its CaO content is up to 60%-70%.The steel slag tailing slurry that the slag that produces during pneumatic steelmaking produces after the magnetic separation of wet type grinding becomes solid waste, piles up in the slag field, and these two kinds of solid waste all do not have and effectively utilize method.
Summary of the invention
The objective of the invention is is the deficiency that exists to existing desulfurizing agent; A kind of sintering flue gas desulfurization agent and preparation method thereof is provided; The novel desulfurizing agent that this preparation method makes can substitute the raw material of quick lime as " calcium base method " sulfur removal technology fully; Reduce the operating cost of sintering flue gas desulfurization system, reduce CO
2Generation, reduced that slag is piled up and dedusting ash is piled up, reach the purpose of " treatment of wastes with processes of wastes against one another ", high economic, environment and social benefit are arranged.
The present invention is for realizing above-mentioned purpose, and realize through following technical scheme: a kind of sintering flue gas desulfurization agent, its raw material have steel slag tailing slurry and limekiln dedusting ash, and by weight percentage, CaO content is 40%-60% in the steel slag tailing slurry, Al
2O
3Content be 0-15%; CaO content in the dedusting ash of limekiln is 60%-80%, and the content of CaO is 60%-70% in steel slag tailing slurry and the limekiln dedusting ash mixture.
A kind of preparation method of sintering flue gas desulfurization agent may further comprise the steps:
1. converter slag is inserted magnetic separator, the iron content in the slag is reduced to below 2%;
2. the slag after the magnetic separation is inserted ball mill and pulverize, obtain the steel slag tailing slurry of granularity less than 50 μ m;
3. use analytical instrument to detect the percentage by weight of each composition in steel slag tailing slurry and the limekiln dedusting ash, guarantee that the content of CaO in the steel slag tailing slurry that 2. step obtain is more than 40%, Al
2O
3Content be 0-15%; CaO content in the dedusting ash of limekiln is more than 60%;
4. the percentage by weight of composition is satisfied steel slag tailing slurry that 3. step require and send in the blending tank in proportion with the limekiln dedusting ash and mix, the content that makes CaO in the mixture is 60%-70%, and mixture promptly obtains desulfurizing agent after mixer stirs.
The ratio of 4. middle steel slag tailing slurry of step and limekiln dedusting ash is: by weight percentage, and steel slag tailing slurry 5%-30%, limekiln dedusting ash 70%-95%; The mixing drum of mixer is processed by permeability magnetic material, and the mixing drum periphery wall is installed solenoid, and solenoid is connected with power supply, and the mixing drum internal perisporium is provided with wearing layer; Wearing layer is processed by ceramic material.
The invention has the advantages that: the present invention makes full use of solid waste such as the limekiln dedusting ash, steel slag tailing slurry of metallurgy industry; Problems such as the land occupation that the solid waste accumulation is produced, polluted source, contaminated environment have been solved; Desulfurizing agent of the present invention can substitute the raw material of quick lime as " calcium base method " sulfur removal technology fully; Reduce the use amount of quick lime, reduce CO
2Discharging reduces operating cost, and the ferro element rate of recovery in the slag is high.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
A kind of its raw material of sintering flue gas desulfurization agent of the present invention has steel slag tailing slurry and limekiln dedusting ash, and by weight percentage, CaO content is 40%-60% in the steel slag tailing slurry, Al
2O
3Content be 0-15%; CaO content in the dedusting ash of limekiln is 60%-80%, and the content of CaO is 60%-70% in steel slag tailing slurry and the limekiln dedusting ash mixture.When the content of CaO was 60%-70%, desulfurizing agent of the present invention was applicable to that sintering gas flue gas sulfuric dioxide content is less than 2500 mg/Nm
3Any situation.Steel slag tailing slurry and limekiln dedusting ash are not fixed proportion collocation, and its proportioning depends primarily on content of sulfur dioxide and the height of CaO content in the composition separately in the sinter fume.The present invention makes full use of solid waste such as the limekiln dedusting ash, steel slag tailing slurry of metallurgy industry, has solved solid waste and has piled up problems such as the land occupation that produced, polluted source, contaminated environment.Novel desulfurizing agent can substitute the raw material of quick lime as " calcium base method " sulfur removal technology fully, reduces the use amount of quick lime, reduces CO
2Discharging according to measuring and calculating, whenever removes 1 ton of SO
2Can reduce CO
2Discharge about 0.7 ton; Reduce operating cost, because desulfurizing agent utilization of the present invention is solid waste, ton ore deposit operating cost reduces by 1 yuan approximately.
The preparation method of a kind of sintering flue gas desulfurization agent of the present invention may further comprise the steps:
1. converter slag is inserted magnetic separator, the iron content in the slag is reduced to below 2%;
2. the slag after the magnetic separation is inserted ball mill and pulverize, obtain the steel slag tailing slurry of granularity less than 50 μ m;
3. use analytical instrument to detect the percentage by weight of each composition in steel slag tailing slurry and the limekiln dedusting ash, guarantee that the content of CaO in the steel slag tailing slurry that 2. step obtain is more than 40%, Al
2O
3Content be 0-15%; CaO content in the dedusting ash of limekiln is more than 60%;
4. the percentage by weight of composition is satisfied steel slag tailing slurry that 3. step require and send in the blending tank in proportion with the limekiln dedusting ash and mix, the content that makes CaO in the mixture is 60%-70%, and mixture promptly obtains desulfurizing agent after mixer stirs.
Granularity after slag is pulverized is crossed the speed of affects desulphurization reaction; Know through experiment: the granularity of steel slag tailing slurry is during less than 50 μ m; Influence to the speed of desulphurization reaction causes is minimum, if the granularity of steel slag tailing slurry greater than 50 μ m, can cause desulphurization reaction speed significantly to reduce; Content of reaction byproduct rises, and can't satisfy the actual production requirement.Al in the steel slag tailing slurry
2O
3Be impurity, its percentage by weight is high more, and the desulfurizing agent that desulphurization reaction consumes is just many more, can cause the rising of operating cost, therefore in order to control operating cost, need guarantee Al
2O
3Content is in the scope below 15%.When the content of CaO was 60%-70%, desulfurizing agent of the present invention was applicable to that sintering gas flue gas sulfuric dioxide content is less than 2500 mg/Nm
3Any situation.Steel slag tailing slurry and limekiln dedusting ash are not fixed proportion collocation, and its proportioning depends primarily on content of sulfur dioxide and the height of CaO content in the composition separately in the sinter fume.
The present invention is being used for sintering gas flue gas sulfuric dioxide content less than 2500 mg/Nm
3Desulphurization reaction the time, the steel slag tailing slurry that step usually adopts in 4. and the ratio of limekiln dedusting ash are: by weight percentage, steel slag tailing slurry 5%-30%, limekiln dedusting ash 70%-95%.The ratio of steel slag tailing slurry and limekiln dedusting ash is in this scope the time, and in the time of can the content of CaO is modal value in steel slag tailing slurry and limekiln dedusting ash, proportioning goes out to be fit to the desulfurizing agent of various sintering gas flue gas sulfuric dioxide content easily.Embodiment is following:
1, SO in the flue gas
2Content is 1500～2500 mg/Nm
3The time, the composition in the desulfurizing agent by weight percentage: steel slag tailing slurry 5%, limekiln dedusting ash 95%, CaO content in the desulfurizing agent: 70%.
2, SO in the flue gas
2Content is 1000～1500 mg/Nm
3The time, the composition in the desulfurizing agent by weight percentage: steel slag tailing slurry 10%, limekiln dedusting ash 90%, CaO content in the desulfurizing agent: 66%.
3, SO in the flue gas
2Content is 500～1000 mg/Nm
3The time, the composition in the desulfurizing agent by weight percentage: steel slag tailing slurry 15%, limekiln dedusting ash 85%, CaO content in the desulfurizing agent: 64%.
4, SO in the flue gas
2Content is less than 500 mg/Nm
3The time, the composition in the desulfurizing agent by weight percentage: steel slag tailing slurry 30%, limekiln dedusting ash 70%, CaO content in the desulfurizing agent: 60%.
The present invention is in order to select the ferro element in the slag more completely; Again mixture is carried out magnetic separation when can stir at mixture to steel slag tailing slurry and limekiln dedusting ash; When converter slag is carried out magnetic separation; Have in the slag that iron compound condenses in greater particle size, can't thoroughly select, this part iron compound can together be pulverized with slag; Get into steel slag tailing slurry, therefore when the mixture to steel slag tailing slurry and limekiln dedusting ash stirs, again mixture being carried out magnetic separation can effectively select ferro element remaining in the slag.Be to realize this purpose can adopting following structure: the mixing drum of mixer 1 is processed by permeability magnetic material, and mixing drum 1 periphery wall is installed solenoid 2, and solenoid 2 is connected with power supply 3, and mixing drum 1 internal perisporium is provided with wearing layer 4.When the mixture to steel slag tailing slurry and limekiln dedusting ash stirs, to solenoid 2 energisings, make solenoid 2 generation magnetic fields through power supply 3; Stirring along with mixer; Mixture constantly rolls in mixing drum 1, and the fine particle of iron content can be adsorbed on mixing drum 1 inwall rolling after near mixing drum 1 barrel in the mixture; Thing to be mixed cuts off the electricity supply 3 after discharging again, and remaining iron content particle in the mixing drum 1 is cleared up recovery.Show through repeatedly testing, adopt said structure that mixture was stirred magnetic separation after 10 minutes, can not detect in the mixture that mixing drum 1 is discharged and contain ferro element, the ferro element rate of recovery in the slag is near 100%.Because the granularity of iron content particle is less in the mixture, need on the inwall that is adsorbed on mixing drum 1 that bigger magnetic force can be firm with it, therefore in order to reduce magnetic force loss, mixing drum 1 need by ferromagnetism such as ferroalloy preferably permeability magnetic material process.Produce chip entering mixture in order to prevent that mixing drum 1 from self wearing and tearing; Can wearing layer 4 be set at mixing drum 1 internal perisporium; The wearing layer 4 preferred ceramic materials that adopt are processed, and the composition of ceramic material is main with silica and calcium silicates, even there is chip to get into mixture; Can not impact desulphurization reaction yet; Certainly wearing layer 4 also can adopt macromolecular materials such as polyvinyl chloride, but polyvinyl chloride macromolecule material may produce cotton-shaped cast after wearing and tearing, and cotton-shaped cast can impact desulphurization reaction after getting into mixture.
Claims (5)
1. sintering flue gas desulfurization agent is characterized in that: its raw material has steel slag tailing slurry and limekiln dedusting ash, and by weight percentage, CaO content is 40%-60% in the steel slag tailing slurry, Al
2O
3Content be 0-15%; CaO content in the dedusting ash of limekiln is 60%-80%, and the content of CaO is 60%-70% in steel slag tailing slurry and the limekiln dedusting ash mixture.
2. the preparation method of a sintering flue gas desulfurization agent is characterized in that: may further comprise the steps:
1. converter slag is inserted magnetic separator, the iron content in the slag is reduced to below 2%;
2. the slag after the magnetic separation is inserted ball mill and pulverize, obtain the steel slag tailing slurry of granularity less than 50 μ m;
3. use analytical instrument to detect the percentage by weight of each composition in steel slag tailing slurry and the limekiln dedusting ash, guarantee that the content of CaO in the steel slag tailing slurry that 2. step obtain is more than 40%, Al
2O
3Content be 0-15%; CaO content in the dedusting ash of limekiln is more than 60%;
4. the percentage by weight of composition is satisfied steel slag tailing slurry that 3. step require and send in the blending tank in proportion with the limekiln dedusting ash and mix, the content that makes CaO in the mixture is 60%-70%, and mixture promptly obtains desulfurizing agent after mixer stirs.
3. the preparation method of a kind of sintering flue gas desulfurization agent according to claim 2 is characterized in that: the ratio of 4. middle steel slag tailing slurry of step and limekiln dedusting ash is: by weight percentage, and steel slag tailing slurry 5%-30%, limekiln dedusting ash 70%-95%.
4. the preparation method of a kind of sintering flue gas desulfurization agent according to claim 2; It is characterized in that: the mixing drum of mixer (1) is processed by permeability magnetic material; Mixing drum (1) periphery wall is installed solenoid (2); Solenoid (2) is connected with power supply (3), and mixing drum (1) internal perisporium is provided with wearing layer (4).
5. the preparation method of a kind of sintering flue gas desulfurization agent according to claim 4 is characterized in that: wearing layer (4) is processed by ceramic material.
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| CN201210139819.7A CN102698575B (en) | 2012-01-17 | 2012-05-08 | Sintering flue gas desulfurizing agent and preparation method thereof |
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| CN201210013954.7 | 2012-01-17 | ||
| CN201210013954 | 2012-01-17 | ||
| CN201210139819.7A CN102698575B (en) | 2012-01-17 | 2012-05-08 | Sintering flue gas desulfurizing agent and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921002A (en) * | 2016-05-31 | 2016-09-07 | 武汉钢铁股份有限公司 | Semi-dry desulfurization process calcium-based desulfurizing agent and preparation method thereof |
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
| CN113074366A (en) * | 2021-04-16 | 2021-07-06 | 太原理工大学 | Coal-fired flue gas CO2 solidification adsorption system |
| CN114507076A (en) * | 2020-11-15 | 2022-05-17 | 南京宝地梅山产城发展有限公司 | Vertical kiln panel castable and use method thereof |
| CN114588770A (en) * | 2022-03-29 | 2022-06-07 | 宁波太极环保设备有限公司 | Egg shell powder modified steel slag waste modified desulphurization absorbent and preparation method thereof |
| CN116510495A (en) * | 2023-05-30 | 2023-08-01 | 曲阜龙坤环保科技有限公司 | Sintering flue gas desulfurizing agent and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110713A (en) * | 1995-03-25 | 1995-10-25 | 柳州市东风化工厂 | Mixed sweetening agent |
| CN101293170A (en) * | 2008-01-12 | 2008-10-29 | 中国海洋大学 | Composite sulphur dioxide desulfurizing agent and preparation method thereof |
| CN101607172A (en) * | 2008-06-16 | 2009-12-23 | 中国科学院过程工程研究所 | A kind of desulfurizing agent and method for making thereof that is used for flue gas desulfurization |
-
2012
- 2012-05-08 CN CN201210139819.7A patent/CN102698575B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110713A (en) * | 1995-03-25 | 1995-10-25 | 柳州市东风化工厂 | Mixed sweetening agent |
| CN101293170A (en) * | 2008-01-12 | 2008-10-29 | 中国海洋大学 | Composite sulphur dioxide desulfurizing agent and preparation method thereof |
| CN101607172A (en) * | 2008-06-16 | 2009-12-23 | 中国科学院过程工程研究所 | A kind of desulfurizing agent and method for making thereof that is used for flue gas desulfurization |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921002A (en) * | 2016-05-31 | 2016-09-07 | 武汉钢铁股份有限公司 | Semi-dry desulfurization process calcium-based desulfurizing agent and preparation method thereof |
| CN105921002B (en) * | 2016-05-31 | 2019-09-10 | 武汉钢铁有限公司 | A kind of semi-dry desulfurizing process calcium-based desulfurizing agent and preparation method thereof |
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
| CN114507076A (en) * | 2020-11-15 | 2022-05-17 | 南京宝地梅山产城发展有限公司 | Vertical kiln panel castable and use method thereof |
| CN114507076B (en) * | 2020-11-15 | 2022-11-15 | 南京宝地梅山产城发展有限公司 | Vertical kiln panel castable and use method thereof |
| CN113074366A (en) * | 2021-04-16 | 2021-07-06 | 太原理工大学 | Coal-fired flue gas CO2 solidification adsorption system |
| CN113074366B (en) * | 2021-04-16 | 2022-11-29 | 太原理工大学 | Coal-fired flue gas CO2 solidification adsorption system |
| CN114588770A (en) * | 2022-03-29 | 2022-06-07 | 宁波太极环保设备有限公司 | Egg shell powder modified steel slag waste modified desulphurization absorbent and preparation method thereof |
| CN116510495A (en) * | 2023-05-30 | 2023-08-01 | 曲阜龙坤环保科技有限公司 | Sintering flue gas desulfurizing agent and preparation method thereof |
| CN116510495B (en) * | 2023-05-30 | 2024-03-22 | 曲阜龙坤环保科技有限公司 | Sintering flue gas desulfurizing agent and preparation method thereof |
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| CN102698575B (en) | 2014-04-30 |
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