CN114737053A - Sintering method based on dust removal ash particle bottoming - Google Patents
Sintering method based on dust removal ash particle bottoming Download PDFInfo
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- CN114737053A CN114737053A CN202210056457.9A CN202210056457A CN114737053A CN 114737053 A CN114737053 A CN 114737053A CN 202210056457 A CN202210056457 A CN 202210056457A CN 114737053 A CN114737053 A CN 114737053A
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- sintering
- dust removal
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- ash particles
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- C—CHEMISTRY; METALLURGY
- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C—CHEMISTRY; METALLURGY
- 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
- C22B1/18—Sintering; Agglomerating in sinter pots
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- C—CHEMISTRY; METALLURGY
- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a sintering method based on dust removal ash particle bottom paving, which comprises the steps of uniformly mixing and granulating a sintering mixture, carrying out micronization treatment on the mixed dust removal ash, finishing bottom paving and material distribution and preparing a sintering ore. The method realizes the replacement of the bottom material by replacing finished sintered ore with the dedusting ash particles, adopts graded bottom laying cloth, and lays the dedusting ash particles with close particle size in the same material layer, so that on the premise of realizing the stable quality of sintered minerals, the air permeability is better, the sintering speed is improved, the utilization coefficient of a sintering machine is improved, the solid fuel consumption is reduced, and the method is favorable for metallurgical enterprises to recover secondary resources.
Description
Technical Field
The invention belongs to the technical field of metal smelting, and relates to a sintering method based on bottom paving of fly ash particles.
Background
In recent years, the rapid development of the steel industry has brought about a serious problem of environmental pollution. A great deal of dust is generated along with the process, wherein the sintering, iron-making and steel-making processes are important dust emission sources in the steel industry. Research finds that the particle pollution load is highest in all steel production processes during sintering, and is one of the main sources of fine particles in the atmosphere.
In the prior art, most enterprises adopt a sintering or pelletizing batching system to recycle the fly ash by adopting a recycling mode of the fly ash. The recovery method is simple and convenient to operate, the cost is relatively low, but the influence on sintering production is various: firstly, the dedusting ash has various and large quantity, and the components are unstable, so that the quality of the sintered minerals is unstable, and the component fluctuation is large; secondly, due to the process, the dedusting ash is subjected to a high-temperature roasting process, so that the hydrophobicity is strong, the particle size is small, the mixture is difficult to pelletize when the dedusting ash is directly added, the air permeability of a sinter layer is easy to deteriorate, and the sintering production capacity is reduced. In recent years, researches show that after various dedusting ashes are subjected to pre-mixing and uniformly-mixing measures, a certain amount of limestone powder is added as a binder to solve the problem of balling, and then the limestone powder participates in sintering and batching to realize harmless utilization of the dedusting ashes, so that a good practical effect is obtained from the aspect of long-term operation tracking.
Meanwhile, most of the sintering machine bottom materials at home and abroad adopt sintered ores with the grain size of 10-20 mm screened from finished sintered ores, and the method can reduce the sintering yield and increase the sintering cost. Based on the method, the best substitute of the sintering bedding materials is researched and found, and the method has important significance for reducing the production cost of the sintering machine and improving the finished product rate of the sintered ore.
Disclosure of Invention
The invention aims to provide a sintering method based on dust removal ash particle bottom laying, which can improve the finished product ratio of sinter and reduce the solid fuel consumption of the sinter so as to reduce the iron-making cost.
Therefore, the invention adopts the following technical scheme:
a sintering method based on dust removal particle bottoming comprises the following steps:
s1, proportioning raw materials participating in a sintering process according to a certain proportion, wherein the raw materials comprise the following components in percentage by weight: 58-60wt% of comprehensive concentrate, 9-10wt% of PB fine ore, 16-18wt% of blast furnace return mine, 2-2.5wt% of fly ash, 2.5-3wt% of quicklime, 12-13wt% of limestone and 1.6-2.0wt% of coke powder, uniformly mixing the raw materials, and performing secondary uniform mixing granulation under a water-wet condition to obtain a sintering mixture;
s2, uniformly mixing metallurgical dedusting ash according to a certain proportion to perform pretreatment to form mixed dedusting ash, adding iron ore powder and fuel into the mixed dedusting ash, adding a certain amount of limestone powder as a binder, uniformly mixing, adding 6-8% of water by mass ratio to perform wetting, performing micronization treatment by using a disc pelletizer to form dedusting ash particles with the diameter of 5-16 mm, and drying the dedusting ash particles at the temperature of 80-120 ℃, wherein the water content of the dried dedusting ash particles is less than 1%;
s3, further dividing the dust removal ash particles subjected to drying treatment into two size fractions of 10mm-16mm and 5mm-10mm, paving the dust removal ash particles with the larger size fraction on the lowest layer of the sintering machine trolley, paving the dust removal ash particles with the smaller size fraction on the second layer, and paving the base material with the total thickness of about 30 mm;
s4, uniformly distributing the sintering mixture on the bedding material, and scraping the material surface, wherein the height of the sintering material layer is 500-550 mm;
s5, after the charging is finished, starting an igniter, wherein the ignition time is 3-5min, the ignition negative pressure is controlled at 6000-minus charge 6010Pa, the sintering negative pressure is controlled at 8990-minus charge 9000Pa, then cooling the sintering ore under the condition of air draft, stopping the air draft when the temperature is reduced to 150 ℃, and pouring out the sintered ore from the sintering cup while stopping the air draft;
and S6, carrying out particle size screening and drum strength detection on the sintered ore under different bedding material conditions, and carrying out metallurgical performance analysis.
Furthermore, the water-moistening condition means that a layer of free water is formed on the outer surface of the ore particles by spraying, so that the agglomeration of sticky powder is facilitated, the pelletizing effect is enhanced, and the water content is controlled to be 3-7%.
Further, the mixed fly ash in the step S2 is composed of the following components in percentage by mass: and (4) TFe: 41.74%, S: 0.44%, P: 0.08% and SiO2：4.53 %、CaO：6.59 %、MgO：1.34%、TiO2：0.06 %、K2O：0.44%、Na2O: 0.45%, Pb: 0.04% and ZnO: 0.99 percent.
Further, the metallurgical dust removal ash in the step S2 is formed by uniformly premixing sintered dust removal ash, blast furnace gas ash, cast house dust removal ash, converter sludge and gas sludge according to the mass weight ratio of 3:3:2:1: 1.
The invention has the beneficial effects that:
the method realizes the replacement of the bottom material by replacing finished sintered ore with the dedusting ash particles, adopts graded bottom laying cloth, and lays the dedusting ash particles with close particle size fraction on the same material layer, so that on the premise of realizing stable sintered mineral quality, the method has better air permeability, improves the sintering rate, improves the utilization coefficient of a sintering machine, reduces the consumption of solid fuel, is beneficial to recovering secondary resources of metallurgical enterprises, and creates economic and environmental protection benefits.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical scheme of the invention is described in the following by combining the attached drawings and an implementation method.
As shown in fig. 1, a sintering method based on settled dust particles bottom comprises the following steps:
s1, proportioning raw materials participating in a sintering process according to a certain proportion, wherein the raw materials comprise the following components in percentage by weight: 58-60wt% of comprehensive concentrate, 9-10wt% of PB fine ore, 16-18wt% of blast furnace return fine, 2-2.5wt% of fly ash, 2.5-3wt% of quick lime, 12-13wt% of limestone and 1.6-2.0wt% of coke powder, uniformly mixing the raw materials, and performing secondary uniform mixing and granulation under a water-wet condition.
The main raw material components of the above sinter mix are shown in table 1 below.
TABLE 1 main raw material composition (wt%) of sinter mix
Specifically, the moistening condition means that a layer of free water is formed on the outer surface of the ore particles by spraying, so that the agglomeration of sticky powder is facilitated, the pelletizing effect is enhanced, and the water content is controlled to be 3-7%.
S2, uniformly mixing metallurgical dust removal ash according to a certain proportion to perform pretreatment to form mixed dust removal ash, adding iron ore powder and fuel into the mixed dust removal ash, adding a certain amount of limestone powder as a binder, uniformly mixing, adding 6-8% of water by mass to perform wetting, performing micronization treatment by using a disc pelletizer to form dust removal ash particles with the diameter of 5-16 mm, and drying the dust removal ash particles at the temperature of 80-120 ℃, wherein the water content of the dried dust removal ash particles is less than 1%.
Specifically, the metallurgical dust removal ash is formed by premixing and uniformly mixing sintered dust removal ash, blast furnace gas ash, cast house dust removal ash, converter sludge and gas sludge according to the mass weight ratio of 3:3:2:1: 1; the mixed dedusting ash comprises the following components in percentage by mass: TFe: 41.74%, S: 0.44%, P: 0.08% and SiO2：4.53 %、CaO：6.59 %、MgO：1.34%、TiO2：0.06 %、K2O：0.44%、Na2O: 0.45%, Pb: 0.04% and ZnO: 0.99 percent.
S3, preparing a certain amount of bedding materials, and finishing bedding and distributing, wherein the thickness of the bedding materials is 30mm, and the specific embodiment comprises three bedding schemes, wherein:
scheme 1 is that 2kg of finished sintered ore with the granularity of 10mm-20mm is selected as a bedding material and evenly paved at the bottom of a sintering cup;
scheme 2 is that 2kg of dust removal ash particles with the particle size of 5mm-15mm after drying treatment are selected as a bedding material and evenly paved at the bottom of a sintering cup;
scheme 3 is a scheme adopted by the invention and comprises the steps of selecting a certain amount of dust removal ash particles subjected to drying treatment, dividing the dust removal ash particles into two size fractions of 10mm-16mm and 5mm-10mm, paving the dust removal ash particles with a larger size fraction on the lowest layer of a sintering cup, and paving the dust removal ash particles with a smaller size fraction on the second layer.
S4, adding the sintering mixture from the cylindrical mixer onto the bedding material in the sintering cup, and scraping the material surface, wherein the height of the sintering material layer is 505mm and the height comprises the bedding material.
S5, starting an igniter after the charging is finished, controlling the ignition time to be 3min, controlling the ignition negative pressure to be 6000Pa and controlling the sintering negative pressure to be 9000Pa, cooling the sintered ore under the condition of air draft, reducing the temperature to 150 ℃, stopping the air draft, and pouring the sintered ore from the sintering cup while stopping the air draft;
and S6, carrying out particle size screening and drum strength detection on the sintered ore under different bedding material conditions, and carrying out metallurgical performance analysis.
As can be seen from table 2, compared with the use of the finished sintered ore as the bedding material, the drum index of the finished sintered ore of the two bottom paving schemes of dust removal ash particles and dust removal ash particle grading is basically stable, but the yield and the solid fuel consumption index are greatly improved, particularly after the bottom paving is carried out by adopting the dust removal ash particle grading, the utilization coefficient is improved by 4.26%, the solid fuel consumption is reduced by 3.86%, and good effects of increasing the yield and reducing the consumption are achieved.
TABLE 2 comparison of sintering index differences under different bedding material conditions
As can be seen from Table 3, compared with the use of the finished sintered ore as the bedding material, the metallurgical performance of the finished sintered ore of the two bedding schemes of the dust-removing ash particles and the dust-removing ash particle grading is relatively basically stable, and the requirements of the blast furnace can be met.
| Scheme(s) | Bedding material | RI/% | RDL+3.15/% | Softening onset temperature/. degree C | Softening end temperature/. degree.C | Softening interval/. degree.C | Melt drop temperature/. degree.C |
| 1 | Sintered ore | 86.96 | 88.60 | 1019 | 1150 | 131 | 1269 |
| 2 | Dust removal particles | 83.78 | 88.41 | 1008 | 1152 | 144 | 1258 |
| 3 | Dust particle classification | 85.96 | 88.59 | 1011 | 1150 | 139 | 1271 |
TABLE 3 comparison of the metallurgical properties of the sinter under different bedding conditions
The process is simple and convenient, and the tests prove that the fly ash particles can replace finished sintered ore to realize bottom material paving, and meanwhile, graded bottom material paving is adopted, the fly ash particles with close particle size fraction are paved on the same material layer, so that on the premise of realizing stable mineral content of sintering, the air permeability is better, the sintering rate is improved by 2.89%, and the utilization coefficient of the sintering machine is improved by 0.06 t/(m) per cent2H ], the solid fuel consumption is reduced by 2.52 kg.t < -1 >, and accordingly, the economic benefit of 865.7 ten thousand yuan can be generated in the practice of a certain sintering machine, so that the method is beneficial to the recovery of secondary resources of metallurgical enterprises, and can create economic and environmental protection double benefits.
Claims (4)
1. A sintering method based on dust removal ash particle bottoming is characterized by comprising the following steps:
s1, proportioning raw materials participating in a sintering process according to a certain proportion, wherein the raw materials comprise the following components in percentage by weight: 58-60wt% of comprehensive concentrate, 9-10wt% of PB fine ore, 16-18wt% of blast furnace return mine, 2-2.5wt% of fly ash, 2.5-3wt% of quicklime, 12-13wt% of limestone and 1.6-2.0wt% of coke powder, uniformly mixing the raw materials, and performing secondary uniform mixing granulation under a water-wet condition to obtain a sintering mixture;
s2, uniformly mixing metallurgical dedusting ash according to a certain proportion to perform pretreatment to form mixed dedusting ash, adding iron ore powder and fuel into the mixed dedusting ash, adding a certain amount of limestone powder as a binder, uniformly mixing, adding 6-8% of water by mass ratio to perform wetting, performing micronization treatment by using a disc pelletizer to form dedusting ash particles with the diameter of 5-16 mm, and drying the dedusting ash particles at the temperature of 80-120 ℃, wherein the water content of the dried dedusting ash particles is less than 1%;
s3, further dividing the dust removal ash particles subjected to drying treatment into two size fractions of 10mm-16mm and 5mm-10mm, paving the dust removal ash particles with the larger size fraction on the lowest layer of the sintering machine trolley, paving the dust removal ash particles with the smaller size fraction on the second layer, and paving the base material with the total thickness of about 30 mm;
s4, uniformly distributing the sintering mixture on the bedding material, and scraping the material surface, wherein the height of the sintering material layer is 500-550 mm;
s5, after the charging is finished, starting an igniter, wherein the ignition time is 3-5min, the ignition negative pressure is controlled at 6000-minus charge 6010Pa, the sintering negative pressure is controlled at 8990-minus charge 9000Pa, then cooling the sintering ore under the condition of air draft, stopping the air draft when the temperature is reduced to 150 ℃, and pouring out the sintered ore from the sintering cup while stopping the air draft;
and S6, carrying out particle size screening and drum strength detection on the sintered ore under different bedding material conditions, and carrying out metallurgical performance analysis.
2. The sintering method based on settled bottom of fly ash particles as claimed in claim 1, wherein the moistening condition in step S1 is to spray a layer of free water on the surface of the ore particles to facilitate the agglomeration of the sticky powder and enhance the pelletizing effect, and the water content is controlled to be 3-7%.
3. The sintering method based on settled dust particle bedding as claimed in claim 1, wherein the mixed settled dust in the step S2 is composed of the following components by mass percent: TFe: 41.74%, S: 0.44%, P: 0.08% and SiO2：4.53 %、CaO：6.59 %、MgO：1.34%、TiO2：0.06 %、K2O：0.44%、Na2O: 0.45%, Pb: 0.04% and ZnO: 0.99 percent.
4. The sintering method based on settled dust particle bottoming as claimed in claim 1, wherein the metallurgical settled dust in step S2 is formed by uniformly premixing sintered settled dust, blast furnace gas dust, cast house settled dust, converter sludge and gas sludge in a mass weight ratio of 3:3:2:1: 1.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63128129A (en) * | 1986-11-17 | 1988-05-31 | Sumitomo Metal Ind Ltd | Manufacture of sintered ore |
| CN104762468A (en) * | 2015-03-26 | 2015-07-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering bedding material, and manufacturing method and sintering method thereof |
| CN107419045A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | The recovery method and blast furnace dedusting ash agglomerated material of blast furnace dedusting ash |
| CN109207739A (en) * | 2018-09-17 | 2019-01-15 | 中南大学 | A kind of method of resource utilization zinc-containing metallurgy dust production iron-smelting furnace charge |
| CN109957651A (en) * | 2019-05-10 | 2019-07-02 | 唐山瑞丰钢铁（集团）有限公司 | Adjust the sintering production method of shop fixtures thickness of feed layer |
| CN113604660A (en) * | 2021-06-21 | 2021-11-05 | 酒泉钢铁(集团)有限责任公司 | Dedusting ash micronized recycling process method |
-
2022
- 2022-01-18 CN CN202210056457.9A patent/CN114737053A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63128129A (en) * | 1986-11-17 | 1988-05-31 | Sumitomo Metal Ind Ltd | Manufacture of sintered ore |
| CN104762468A (en) * | 2015-03-26 | 2015-07-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering bedding material, and manufacturing method and sintering method thereof |
| CN107419045A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | The recovery method and blast furnace dedusting ash agglomerated material of blast furnace dedusting ash |
| CN109207739A (en) * | 2018-09-17 | 2019-01-15 | 中南大学 | A kind of method of resource utilization zinc-containing metallurgy dust production iron-smelting furnace charge |
| CN109957651A (en) * | 2019-05-10 | 2019-07-02 | 唐山瑞丰钢铁（集团）有限公司 | Adjust the sintering production method of shop fixtures thickness of feed layer |
| CN113604660A (en) * | 2021-06-21 | 2021-11-05 | 酒泉钢铁(集团)有限责任公司 | Dedusting ash micronized recycling process method |
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