CN111455166B - Pre-prepared material for reducing discharge amount of nitrogen oxides, production method thereof and sintering material - Google Patents
Pre-prepared material for reducing discharge amount of nitrogen oxides, production method thereof and sintering material Download PDFInfo
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- CN111455166B CN111455166B CN202010444783.8A CN202010444783A CN111455166B CN 111455166 B CN111455166 B CN 111455166B CN 202010444783 A CN202010444783 A CN 202010444783A CN 111455166 B CN111455166 B CN 111455166B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
Abstract
The invention discloses a pre-batching material for reducing the discharge amount of nitrogen oxides, a production method thereof and a sintering material, which are characterized in that: the coke-containing sintering agent is prepared from coke for sintering, iron ore powder for sintering, quicklime for sintering and a pre-prepared material for reducing the discharge amount of nitrogen oxides in a mass ratio of (5: 100): (5-10): (10-20) mixing uniformly to prepare the composition; the pre-ingredient for reducing the discharge amount of nitrogen oxides is prepared from coke with the particle size of 1.5-2.5 mm, iron ore powder with the particle size of below 2.5mm and quicklime with the particle size of below 1mm in a mass ratio of (2.5-5): (1.5-2) 1, and adding water and uniformly mixing to obtain the product. The sintering material prepared by the invention can be fully combusted, so that the concentration of nitrogen oxide in flue gas is reduced to about 350 mg/cubic meter; the process is simple, the operation is easy, the industrial production is convenient, and the structure of the sintering material is stable.
Description
Technical Field
The invention relates to an improvement of a sintering material in the steel industry, in particular to a pre-prepared material for reducing the discharge amount of nitrogen oxides, a production method thereof and the sintering material.
Background
The sintering process is an important branch of the steel industry, the existing sintering material is prepared by mixing powdered iron ore powder, quicklime and coke, the granularity of the coke for sintering is required to be below 5mm, the granularity of the iron ore powder for sintering is required to be below 8mm, the granularity of the quicklime for sintering is required to be below 2mm, after the sintering material is uniformly mixed, the sintering material is placed on a sintering trolley and is combusted to generate blocky sintering ore with certain metallurgical performance, a large amount of flue gas can be generated in the sintering process, the concentration of nitrogen oxide in the flue gas is basically about 500 mg/cubic meter, the nitrogen oxide is a substance with the most serious pollution, the vast majority of the nitrogen oxide is generated by combusting the coke, and the emission of the nitrogen oxide is reduced to become the key point of the sintering process at present with more and more severe environmental protection situation. At the present stage, the common method is that raw material control and tail end treatment are carried out in the batching stage, namely coke indexes are strictly controlled and a tail gas treatment device is added, the coke indexes are clearly classified in China, the sintering cost can be greatly increased by coke with better quality, and the production cost can also be increased by improving or newly building a treatment system by adding the tail gas treatment device. In the traditional method for controlling and reducing the emission of nitrogen oxides by raw materials in the material preparation stage, such as controlling the granularity of the raw materials, maintaining accurate water adding amount, adding certain inhibitors, replacing the adding sequence and the like, the concentration of the nitrogen oxides in the flue gas after combustion is generally reduced to about 450 mg/cubic meter, the effect brought by the method is not obvious, and the problem of reducing the emission of the nitrogen oxides in the sintering process is difficult to effectively solve.
Disclosure of Invention
The invention aims to provide a pre-burdening material which is added into a sintering raw material and can effectively reduce the discharge amount of nitrogen oxides in the subsequent sintering process and reduce the production cost.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the pre-prepared material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke is prepared from coke with the grain diameter of 1.5-2.5 mm, iron ore powder with the grain diameter of below 2.5mm and quicklime with the grain diameter of below 1mm according to the mass ratio of (2.5-5): (1.5-2) 1, and adding water and uniformly mixing to obtain the product.
The invention also aims to provide a production method of the pre-burdening material, which has simple process and easy operation, can effectively reduce the discharge amount of nitrogen oxides in the sintering process and reduce the production cost.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the production method of the pre-prepared material for reducing the emission of nitrogen oxides is characterized by comprising the following steps of: it comprises the following steps:
(1) preparing materials: crushing quicklime to below 1mm to obtain quicklime with particle size below 1mm, and standing for later use; crushing iron ore powder, sieving with a 60-mesh sieve to obtain iron ore powder with particle size of less than 2.5mm, and standing; crushing and screening coke, taking the coke with the particle size of 1.5-2.5 mm to prepare the coke with the particle size of 1.5-2.5 mm for sintering, and standing for later use;
(2) mixing coke with the particle size of 1.5-2.5 mm and quicklime with the particle size of less than 1mm according to the mass ratio of (2.5-5) to 1, and then placing the mixture into a mixing barrel to stir for 3-5 min;
(3) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.5-0.9 time of the mass of the quicklime with the particle size of less than 1mm, and stirring for 3-5 min while adding water;
(4) then uniformly adding iron ore powder with the particle size of less than 2.5mm into the mixing barrel, wherein the adding amount is 1.5-2 times of the mass of the quick lime with the particle size of less than 1 mm;
(5) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.1-0.3 time of the mass of the quicklime with the particle size of less than 1mm, and adding water while stirring for 1-3 min;
(6) discharging the materials in the mixing barrel, and standing for 30min to obtain the pre-mixed material for reducing the discharge amount of the nitrogen oxides.
The CaO content of the quicklime is not less than 80%.
The third purpose of the invention is to provide a sintering material which is added with a pre-prepared material for reducing the discharge amount of nitrogen oxides on the basis of mixing the traditional coke, iron ore powder and quicklime for sintering, effectively reduces the discharge amount of nitrogen oxides in the sintering process and reduces the production cost.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the sintering material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke-containing sintering agent is prepared from coke for sintering, iron ore powder for sintering, quicklime for sintering and a pre-prepared material for reducing the discharge amount of nitrogen oxides in a mass ratio of (5: 100): (5-10): (10-20) mixing uniformly to prepare the composition; the pre-ingredient for reducing the discharge amount of nitrogen oxides is prepared from coke with the particle size of 1.5-2.5 mm, iron ore powder with the particle size of below 2.5mm and quicklime with the particle size of below 1mm in a mass ratio of (2.5-5): (1.5-2) 1, and adding water and uniformly mixing to obtain the product.
The granularity of the coke for sintering is required to be less than 5mm, the granularity of the iron ore powder for sintering is required to be less than 8mm, and the granularity of the quicklime for sintering is required to be less than 2 mm.
The invention has the beneficial effects that: the sintered material prepared by the method has the advantages that the coke content in the particles is high, a little coke exists outside the particles, the particle size of the coke is fine, and the coke can be fully combusted; in addition, because the burnt coke, mineral powder and the like belong to porous substances and can effectively adsorb surrounding smoke, the burnt smoke can be absorbed by the porous sintered ore when passing through the sintered ore, so that the concentration of nitrogen oxides in the smoke is reduced to about 350 mg/cubic meter; in addition, the invention has simple process, easy operation and convenient industrial production, and the sintering material has stable structure and lower production fluctuation.
Detailed Description
Example 1:
the pre-prepared material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke is prepared from coke with the grain diameter of 1.5-2.5 mm, iron ore powder with the grain diameter of below 2.5mm and quicklime with the grain diameter of below 1mm according to the mass ratio of 2.5: 1.5:1, and adding water and mixing uniformly.
The production method of the pre-batching for reducing the emission of the nitrogen oxides is characterized by comprising the following steps of: it comprises the following steps:
(1) preparing materials: crushing quicklime to below 1mm to obtain quicklime with particle size below 1mm, and standing for later use; crushing iron ore powder, sieving with a 60-mesh sieve to obtain iron ore powder with particle size of less than 2.5mm, and standing; crushing and screening coke, taking the coke with the particle size of 1.5-2.5 mm to prepare the coke with the particle size of 1.5-2.5 mm for sintering, and standing for later use;
(2) mixing coke with the particle size of 1.5-2.5 mm and quicklime with the particle size of less than 1mm according to the mass ratio of 2.5:1, and then placing the mixture in a mixing barrel to stir for 3 min;
(3) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.5 times of the mass of the quicklime with the particle size of less than 1mm, and stirring for 3min while adding water;
(4) uniformly adding iron ore powder with the particle size of less than 2.5mm into the mixing barrel, wherein the adding amount is 1.5 times of the mass of the quick lime with the particle size of less than 1 mm;
(5) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.1 time of the mass of the quicklime with the particle size of less than 1mm, and stirring for 1min while adding water;
(6) discharging the materials in the mixing barrel, and standing for 30min to obtain the pre-mixed material for reducing the discharge amount of the nitrogen oxides.
The CaO content of the quicklime is not less than 80%.
The sintering material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke-containing sintering agent is prepared from coke for sintering, iron ore powder for sintering, quicklime for sintering and a pre-prepared material for reducing the discharge amount of nitrogen oxides in a mass ratio of (5: 100): 5:10 mixing uniformly to obtain the product; the pre-mixed material for reducing the discharge amount of nitrogen oxides comprises coke with the grain diameter of 1.5-2.5 mm, iron ore powder with the grain diameter of below 2.5mm and quicklime with the grain diameter of below 1mm according to the mass ratio of 2.5: 1.5:1, and adding water and mixing uniformly.
The granularity of the coke for sintering is required to be less than 5mm, the granularity of the iron ore powder for sintering is required to be less than 8mm, and the granularity of the quicklime for sintering is required to be less than 2 mm.
The sintered material for reducing the discharge amount of nitrogen oxides prepared by the invention is placed on a sintering trolley, block-shaped sintered ore with certain metallurgical performance is generated by combustion, and the concentration of the nitrogen oxides in flue gas generated in the sintering process is 361 mg/cubic meter by detection.
Example 2:
the pre-prepared material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke is prepared from coke with the grain diameter of 1.5-2.5 mm, iron ore powder with the grain diameter of below 2.5mm and quicklime with the grain diameter of below 1mm according to the mass ratio of 5: 2:1, adding water and mixing uniformly.
The production method of the pre-batching for reducing the emission of the nitrogen oxides is characterized by comprising the following steps of: it comprises the following steps:
(1) preparing materials: crushing quicklime to below 1mm to obtain quicklime with particle size below 1mm, and standing for later use; crushing iron ore powder, sieving with a 60-mesh sieve to obtain iron ore powder with particle size of less than 2.5mm, and standing; crushing and screening coke, taking the coke with the particle size of 1.5-2.5 mm to prepare the coke with the particle size of 1.5-2.5 mm for sintering, and standing for later use;
(2) mixing coke with the particle size of 1.5-2.5 mm and quicklime with the particle size of less than 1mm according to the mass ratio of 5:1, and then placing the mixture in a mixing barrel to stir for 5 min;
(3) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.9 times of the mass of the quicklime with the particle size of less than 1mm, and stirring for 5min while adding water;
(4) uniformly adding iron ore powder with the particle size of less than 2.5mm into the mixing barrel, wherein the adding amount is 2 times of the mass of the quick lime with the particle size of less than 1 mm;
(5) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.3 times of the mass of the quicklime with the particle size of less than 1mm, and stirring for 3min while adding water;
(6) discharging the materials in the mixing barrel, and standing for 30min to obtain the pre-mixed material for reducing the discharge amount of the nitrogen oxides.
The CaO content of the quicklime is not less than 80%.
The sintering material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke-containing sintering agent is prepared from coke for sintering, iron ore powder for sintering, quicklime for sintering and a pre-prepared material for reducing the discharge amount of nitrogen oxides in a mass ratio of (5: 100): 10: 20, mixing uniformly; the pre-mixed material for reducing the discharge amount of nitrogen oxides is prepared from coke with the particle size of 1.5-2.5 mm, iron ore powder with the particle size of below 2.5mm and quicklime with the particle size of below 1mm according to the mass ratio of 5: 2:1, adding water and mixing uniformly.
The granularity of the coke for sintering is required to be less than 5mm, the granularity of the iron ore powder for sintering is required to be less than 8mm, and the granularity of the quicklime for sintering is required to be less than 2 mm.
The sintered material for reducing the discharge amount of nitrogen oxides prepared by the invention is placed on a sintering trolley, block-shaped sintered ore with certain metallurgical performance is generated by combustion, and the concentration of the nitrogen oxides in flue gas generated in the sintering process is 360 mg/cubic meter through detection.
Example 3:
the pre-prepared material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke is prepared from coke with the grain diameter of 1.5-2.5 mm, iron ore powder with the grain diameter of below 2.5mm and quicklime with the grain diameter of below 1mm according to the mass ratio of 3: 1.7:1, and adding water and mixing uniformly to obtain the product.
The production method of the pre-batching for reducing the emission of the nitrogen oxides is characterized by comprising the following steps of: it comprises the following steps:
(1) preparing materials: crushing quicklime to below 1mm to obtain quicklime with particle size below 1mm, and standing for later use; crushing iron ore powder, sieving with a 60-mesh sieve to obtain iron ore powder with particle size of less than 2.5mm, and standing; crushing and screening coke, taking the coke with the particle size of 1.5-2.5 mm to prepare the coke with the particle size of 1.5-2.5 mm for sintering, and standing for later use;
(2) mixing coke with the particle size of 1.5-2.5 mm and quicklime with the particle size of less than 1mm according to the mass ratio of 3:1, and then placing the mixture in a mixing barrel to stir for 4 min;
(3) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.7 times of the mass of the quicklime with the particle size of less than 1mm, and stirring for 4min while adding water;
(4) uniformly adding iron ore powder with the particle size of less than 2.5mm into the mixing barrel, wherein the adding amount is 1.7 times of the mass of the quick lime with the particle size of less than 1 mm;
(5) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.2 times of the mass of the quicklime with the particle size of less than 1mm, and stirring for 2min while adding water;
(6) discharging the materials in the mixing barrel, and standing for 30min to obtain the pre-mixed material for reducing the discharge amount of the nitrogen oxides.
The CaO content of the quicklime is not less than 80%.
The sintering material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke-containing sintering agent is prepared from coke for sintering, iron ore powder for sintering, quicklime for sintering and a pre-prepared material for reducing the discharge amount of nitrogen oxides in a mass ratio of (5: 100): 8: 15 mixing uniformly; the pre-mixed material for reducing the discharge amount of nitrogen oxides is prepared from coke with the particle size of 1.5-2.5 mm, iron ore powder with the particle size of below 2.5mm and quicklime with the particle size of below 1mm according to the mass ratio of 3: 1.7:1, and adding water and mixing uniformly to obtain the product.
The granularity of the coke for sintering is required to be less than 5mm, the granularity of the iron ore powder for sintering is required to be less than 8mm, and the granularity of the quicklime for sintering is required to be less than 2 mm.
The sintered material for reducing the discharge amount of nitrogen oxides prepared by the invention is placed on a sintering trolley, block-shaped sintered ore with certain metallurgical performance is generated by combustion, and the concentration of the nitrogen oxides in flue gas generated in the sintering process is 342 mg/cubic meter through detection.
Claims (3)
1. A production method of pre-prepared materials for reducing the emission of nitrogen oxides is characterized in that: it comprises the following steps:
(1) preparing materials: crushing quicklime to below 1mm to obtain quicklime with particle size below 1mm, and standing for later use; crushing iron ore powder, sieving with a 60-mesh sieve to obtain iron ore powder with particle size of less than 2.5mm, and standing; crushing and screening coke, taking the coke with the particle size of 1.5-2.5 mm to prepare the coke with the particle size of 1.5-2.5 mm for sintering, and standing for later use; the CaO content of the quicklime is not lower than 80%;
(2) mixing coke with the particle size of 1.5-2.5 mm and quicklime with the particle size of less than 1mm according to the mass ratio of (2.5-5) to 1, and then placing the mixture into a mixing barrel to stir for 3-5 min;
(3) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.5-0.9 time of the mass of the quicklime with the particle size of less than 1mm, and stirring for 3-5 min while adding water;
(4) then uniformly adding iron ore powder with the particle size of less than 2.5mm into the mixing barrel, wherein the adding amount is 1.5-2 times of the mass of the quick lime with the particle size of less than 1 mm;
(5) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.1-0.3 time of the mass of the quicklime with the particle size of less than 1mm, and adding water while stirring for 1-3 min;
(6) discharging the materials in the mixing barrel, and standing for 30min to obtain the pre-mixed material for reducing the discharge amount of the nitrogen oxides.
2. The sintering material for reducing the discharge amount of nitrogen oxides is characterized in that: the coke-containing sintering agent is prepared from coke for sintering, iron ore powder for sintering, quicklime for sintering and a pre-prepared material for reducing the discharge amount of nitrogen oxides in a mass ratio of (5: 100): (5-10): (10-20) mixing uniformly to prepare the composition;
the pre-mixed material for reducing the emission of nitrogen oxides is prepared by the following steps:
(1) preparing materials: crushing quicklime to below 1mm to obtain quicklime with particle size below 1mm, and standing for later use; crushing iron ore powder, sieving with a 60-mesh sieve to obtain iron ore powder with particle size of less than 2.5mm, and standing; crushing and screening coke, taking the coke with the particle size of 1.5-2.5 mm to prepare the coke with the particle size of 1.5-2.5 mm for sintering, and standing for later use; the CaO content of the quicklime is not lower than 80%;
(2) mixing coke with the particle size of 1.5-2.5 mm and quicklime with the particle size of less than 1mm according to the mass ratio of (2.5-5) to 1, and then placing the mixture into a mixing barrel to stir for 3-5 min;
(3) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.5-0.9 time of the mass of the quicklime with the particle size of less than 1mm, and stirring for 3-5 min while adding water;
(4) then uniformly adding iron ore powder with the particle size of less than 2.5mm into the mixing barrel, wherein the adding amount is 1.5-2 times of the mass of the quick lime with the particle size of less than 1 mm;
(5) uniformly spraying water into the mixing barrel, wherein the water adding amount is 0.1-0.3 time of the mass of the quicklime with the particle size of less than 1mm, and adding water while stirring for 1-3 min;
(6) discharging the materials in the mixing barrel, and standing for 30min to obtain the pre-mixed material for reducing the discharge amount of the nitrogen oxides.
3. The sintering material for reducing the discharge amount of nitrogen oxides according to claim 2, characterized in that: the granularity of the coke for sintering is required to be less than 5mm, the granularity of the iron ore powder for sintering is required to be less than 8mm, and the granularity of the quicklime for sintering is required to be less than 2 mm.
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| BR9203748A (en) * | 1992-09-25 | 1993-04-20 | Siderurgica Nacional Sa | IRON MINING SUPERFINES SINTERIZATION PROCESS |
| JP5423611B2 (en) * | 2010-08-09 | 2014-02-19 | 新日鐵住金株式会社 | Method for producing sintered ore |
| CN102260788B (en) * | 2010-12-08 | 2013-02-27 | 鞍钢集团矿业公司 | Sintering method by mixing sintered solid fuel and quick lime in advance |
| JP5857977B2 (en) * | 2013-01-28 | 2016-02-10 | Ｊｆｅスチール株式会社 | Blast furnace sintering raw material manufacturing apparatus and method for manufacturing blast furnace sintered ore |
| BR112019013087B1 (en) * | 2016-12-28 | 2023-04-18 | Jfe Steel Corporation | SINTERIZED ORE MANUFACTURING METHOD |
| CN110004286B (en) * | 2018-01-04 | 2020-10-27 | 中冶长天国际工程有限责任公司 | Modified coke powder based on sintering low-nitrogen-oxide combustion, modification method and system and iron ore sintering method |
| CN109181808B (en) * | 2018-09-30 | 2021-08-03 | 安徽工业大学 | Emission reduction method for nitrogen oxides in iron ore sintering process |
| CN110846498A (en) * | 2019-12-03 | 2020-02-28 | 马鞍山钢铁股份有限公司 | Sintered ore and preparation method thereof |
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