CN110283992B - High-proportion limonite sintering method - Google Patents
High-proportion limonite sintering method Download PDFInfo
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- CN110283992B CN110283992B CN201910658015.XA CN201910658015A CN110283992B CN 110283992 B CN110283992 B CN 110283992B CN 201910658015 A CN201910658015 A CN 201910658015A CN 110283992 B CN110283992 B CN 110283992B
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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
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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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Abstract
The invention discloses a high-proportion limonite sintering method, which comprises the steps of pretreatment and sintering, and specifically comprises the following steps: uniformly mixing 60-70 parts by mass of high crystal water limonite, 25-30 parts by mass of iron-containing concentrate and 5-10 parts by mass of iron-containing fine ore to obtain a material a for later use; sequentially adding 15-25 parts of flux and 5-10 parts of fuel into the material a, uniformly mixing to obtain a material b, and pelletizing the material b to obtain a material c; and sintering the material c to obtain a finished product of sinter d. The invention effectively overcomes the thin-wall big air holes caused by the overflow of the high crystal water in the sintering process, improves the solvent ratio, promotes the generation of liquid phase in the sintering process and improves the strength of a bonding phase, effectively improves the air permeability of a sinter layer through the strict control of process parameters, is beneficial to the generation of calcium ferrite, improves the combustion efficiency and inhibits the crystal form transformation of sinter.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a high-proportion limonite sintering method.
Background
In recent years, with the excess of steel production capacity and the increased market competition, steel enterprises begin to use a large amount of limonite with high crystal water and low price for sintering production based on resource strategy and production cost consideration. However, because the high crystal water limonite has the characteristics of looseness, porosity, small stacking density, high crystal water content, large granularity, easy self-melting, strong assimilation, special sintering liquid phase, low bond phase strength and the like, in the sintering process of the high crystal water limonite with high mixture ratio, the crystal water is decomposed to generate pores after being heated, and the assimilation degree between the crystal water and a calcium ferrite solution is very high, so that the air permeability of a melting zone of a sintering material layer is deteriorated, and the local heating is insufficient. Resulting in slow sintering speed, reduced consolidation strength of the sintered ore, reduced yield, high fuel consumption, and reduced productivity. How to research and solve the technical problems existing in the sintering production of the limonite with high crystal water and produce high-quality and high-strength sintered ore becomes a new technological innovation way which is a key breakthrough for various iron and steel enterprises.
Disclosure of Invention
The invention aims to provide a high-proportion limonite sintering method.
The invention aims to realize the purpose, the high-proportion limonite sintering method comprises the steps of pretreatment and sintering, and specifically comprises the following steps:
A. pretreatment:
1) uniformly mixing 60-70 parts by mass of high crystal water limonite, 25-30 parts by mass of iron-containing concentrate and 5-10 parts by mass of iron-containing fine ore to obtain a material a for later use;
2) sequentially adding 15-25 parts of flux and 5-10 parts of fuel into the material a, uniformly mixing to obtain a material b, and pelletizing the material b to obtain a material c;
B. and (3) sintering: and sintering the material c to obtain a finished product of sinter d.
Because the high crystal water limonite has the characteristics of high crystal water content, looseness, porosity, easy self-melting, strong assimilation property, special sintering liquid phase and low strength of a binding phase, the high-proportion high crystal water limonite has the decomposition heat absorption of crystal water and excessive water migration heat consumption in the sintering process, the sintering ore is easy to generate thin-wall macropores, the strength is reduced, the assimilation degree with a calcium ferrite solution is high, the permeability of a melting zone of a sintering material layer is deteriorated, the sintering speed is slow, the productivity is reduced, the strength of the special sintering liquid phase and the binding phase is low, and the strength of the sintering ore is reduced. The invention relates to a high-proportion limonite sintering method, which effectively solves the technical problems in the high-crystal-water limonite sintering production by increasing the proportion of a fusing agent, improving the moisture content of a mixture, the thickness of a sintering machine material layer, the machine speed and the vertical sintering speed, reducing the ignition temperature, reducing the front negative pressure of a dust remover and other technical measures, realizes the high-crystal-water high-proportion limonite sintering production, and improves the production efficiency and the quality of a sintering process at the same time of realizing the high-crystal-water high-proportion limonite sintering production.
The invention effectively overcomes the thin-wall large pores caused by the overflow of the crystal water in the sintering process of the high crystal water, improves the solvent ratio, promotes the generation of liquid phase in the sintering process and improves the strength of a bonding phase, effectively improves the air permeability of a sinter bed through the strict control of process parameters, is beneficial to the generation of calcium ferrite, improves the combustion efficiency, inhibits the crystal form transformation of the sinter, solves the technical problems of poor sintered mineral content and low production efficiency in the high-ratio sintering production process of the high crystal water limonite, and provides reference experience for the popularization and application of the sintering technology of the high crystal water limonite with the high ratio of more than 65 percent.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The high-proportion limonite sintering method comprises the steps of pretreatment and sintering, and specifically comprises the following steps:
A. pretreatment:
1) uniformly mixing 60-70 parts by mass of high crystal water limonite, 25-30 parts by mass of iron-containing concentrate and 5-10 parts by mass of iron-containing fine ore to obtain a material a for later use;
2) sequentially adding 15-25 parts of flux and 5-10 parts of fuel into the material a, uniformly mixing to obtain a material b, and pelletizing the material b to obtain a material c;
B. and (3) sintering: and sintering the material c to obtain a finished product of sinter d.
The high-crystal-water limonite comprises 55.00-56.00% of iron content, 12.00-14.00% of physical water content and 11.00-13.00% of crystal water content.
The iron-containing concentrate is iron-containing concentrate with iron content of 57.00% -63.00%.
The iron-containing ore separation is iron-containing fine ore with iron content of 58.00% -65.00%.
The flux is limestone, dolomite and/or quicklime.
The flux comprises 3-5 parts by mass of limestone, 8-10 parts by mass of dolomite and 5-7 parts by mass of quick lime.
The fuel is coking coal and/or anthracite.
The fuel comprises 4-6 parts of coking coal and 1-2 parts of anthracite by mass.
And the pelletizing is to place the mixture b in a cylinder mixing and stirring machine, add water for stirring, uniformly mix and pelletize, control the uniformly mixing and pelletizing time to be 5-7 min, control the water content of the mixture to be 9.00-10.00%, and control the content of the particle size fraction smaller than 3mm to be less than 35% to obtain a material c.
And the sintering step is to press the material c according to the reduction of 30-50 mm so as to control the density and the air permeability of the material layer, sintering is carried out under the sintering parameter conditions of 730-760 mm height of the material layer of the mixture, 1050-1100 ℃ ignition temperature, 1.20-1.25 m/min machine speed, 13.50-14.00 mm/min vertical speed and 14.50-15.00 KPa negative pressure before a dust remover, so as to obtain sintered ore, and the sintered ore is crushed, cooled and screened so as to obtain the finished sintered ore d.
The high-proportion limonite sintering method provided by the invention comprises the following specific operation steps:
A. blending and mixing 60.00-70.00% of high crystal water limonite, 25.00-30.00% of iron-containing concentrate and 5.00-10.00% of iron-containing fine ore into a new iron material pile in a blending stock ground.
B. On the basis of the step A, 3.00-5.00% of limestone, 8.00-10.00% of dolomite, 5.00-7.00% of quicklime, 4.00-6.00% of coke powder and 1.00-2.00% of anthracite are mixed according to the mass ratio, and are uniformly mixed with the new iron material in the step A to obtain a mixture.
C. And C, conveying the mixture obtained in the step B into a cylinder mixing stirrer through a belt, adding water, stirring, uniformly mixing and pelletizing, controlling the uniformly mixing and pelletizing for 5-7 minutes, wherein the water content of the mixture is 9.00-10.00%, and the content of the particle size fraction smaller than 3mm is below 35%.
D. And C, conveying the mixture pelletized in the step C to a sintering trolley through a belt, pressing according to the pressing amount of 30-50 mm to control the density and the air permeability of a material layer, and sintering under the sintering parameter conditions of the height of the material layer of the mixture being 730-760 mm, the ignition temperature being 1050-1100 ℃, the machine speed being 1.20-1.25 m/min, the vertical speed being 13.50-14.00 mm/min and the front negative pressure of a dust remover being 14.50-15.00 KPa to obtain the sintered ore.
E. And D, crushing, cooling and screening the sintered ore obtained in the step D to obtain a finished sintered ore, and conveying the finished sintered ore to a finished sintered ore bin through a belt for use by a blast furnace.
The limonite in the step A contains 55.00-56.00% of iron, 12.00-14.00% of physical water and 12.00-15.00% of crystal water. The iron-containing concentrate is 57.00-63.00% of iron, and the iron-containing fine ore is ordinary fine ore and fine ore containing 58.00-65.00% of iron.
And C, using solvents limestone, dolomite, quicklime and fuels in the step B as common products purchased in the market.
And the cylinder mixing stirrer in the step C is conventional equipment in sintering production.
And the parameters in the step D are very important technological parameter indexes in the sintering process, and the selection of parameter control is favorable for improving the air permeability of a sinter bed, improving the production efficiency and improving the quality of sinter.
The finished sintered ore obtained in the step E contains 52.00% -53.00% of iron, and R22.30 to 2.50 times, and the rotating drum index is more than or equal to 80 percent.
The invention is further illustrated by the following specific examples:
example 1
At a certain distance of 260m2The industrial production of limonite with high mixture ratio and high crystal water by a sintering machine is taken as an example, and the specific implementation mode is explained as follows:
A. high crystal water limonite with the mass ratio of 64.67%, iron-containing concentrate with the mass ratio of 28.58% and iron-containing fine ore with the mass ratio of 6.75% are mixed in a mixing stock ground to form a new iron material pile for standby.
B. On the basis of the step A, 5.00 percent of limestone, 9.00 percent of dolomite, 5.50 percent of quicklime, 5.00 percent of coke breeze and 1.30 percent of anthracite are mixed according to the mass ratio and are uniformly mixed with the new iron material A to obtain a mixture.
C. And C, conveying the mixture obtained in the step B into a cylinder mixing stirrer through a belt, adding water, stirring, uniformly mixing and pelletizing, controlling the uniformly mixing and pelletizing time to be 5.50 minutes, wherein the water content of the mixture is 9.70%, and the content of the granules with the size fraction smaller than 3mm is 32.50%.
D. And C, conveying the mixture granulated in the step C to a sintering trolley through a belt, pressing according to the pressing amount of 38mm, and igniting and sintering under the sintering parameter conditions of the mixture layer height of 750mm, the ignition temperature of 1065 ℃, the machine speed of 1.23m/min, the vertical speed of 13.70mm/min and the front negative pressure of 14.80KPa of a dust remover to obtain the sintered ore.
E. And D, crushing, cooling and screening the sintered ore obtained in the step D to obtain a finished sintered ore, and conveying the finished sintered ore to a finished sintered ore bin through a belt for use by a blast furnace.
Example 2
For convenience of comparison and explanation of problems, the sintering production data of the high crystal water limonite with the same sintering machine is compared with the sintering production data of the high crystal water limonite without the sintering machine. The material structure ratio is shown in table 1, the sintering machine process parameter control is shown in table 2, and the sintering production efficiency and the sinter quality are shown in table 3.
TABLE 1 sintering ratio of high crystal water, high manganese limonite
TABLE 2 sintering Process control parameters
TABLE 3 sintering procedure yields
Claims (3)
1. A high-proportion limonite sintering method is characterized by comprising the steps of pretreatment and sintering, and specifically comprises the following steps:
A. pretreatment:
1) uniformly mixing 60-70 parts by mass of limonite, 25-30 parts by mass of iron-containing concentrate and 5-10 parts by mass of iron-containing powder ore to obtain a material a for later use; the limonite comprises 55.00-56.00% of iron content, 12.00-14.00% of physical water content and 11.00-13.00% of crystal water content, the iron-containing concentrate comprises 57.00-63.00% of iron content, and the iron-containing fine ore comprises 58.00-65.00% of iron content;
2) sequentially adding 15-25 parts of flux and 5-10 parts of fuel into the material a, and uniformly mixing to obtain a material b, wherein the flux is limestone, dolomite and/or quicklime, and the fuel is coking coal and/or anthracite; pelletizing the material b, namely placing the material b in a cylindrical mixing and stirring machine, adding water for stirring, uniformly mixing and pelletizing, controlling the uniformly mixing and pelletizing time to be 5-7 min, wherein the water content of the mixture is 9.00-10.00%, and the content of the particle fraction smaller than 3mm is smaller than 35% to obtain a material c;
B. and (3) sintering: pressing the material c according to the pressing amount of 30-50 mm to control the density and the air permeability of the material layer, sintering under the sintering parameter conditions of the height of the material layer of the mixture being 730-760 mm, the ignition temperature being 1050-1100 ℃, the machine speed being 1.20-1.25 m/min, the vertical speed being 13.50-14.00 mm/min and the front negative pressure of a dust remover being 14.50-15.00 KPa to obtain sintered ore, crushing, cooling and screening to obtain the finished sintered ore d.
2. The sintering method of limonite with high proportion as claimed in claim 1, wherein the flux is limestone 3-5 parts, dolomite 8-10 parts and quicklime 5-7 parts by mass.
3. The method for sintering high-proportion limonite according to claim 1, wherein the fuel comprises 4-6 parts by mass of coking coal and 1-2 parts by mass of anthracite.
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| CN111154970B (en) * | 2020-01-07 | 2021-06-29 | 武钢集团昆明钢铁股份有限公司 | Method for improving quality of sinter in sintering production of large-proportion limonite |
| CN111172385B (en) * | 2020-01-20 | 2022-04-08 | 包头钢铁（集团）有限责任公司 | Method for preparing sintered ore by using high-crystallization-water iron ore powder |
| CN113528808B (en) * | 2021-05-24 | 2022-07-01 | 红河钢铁有限公司 | Sintered ore based on high-crystal-water limonite and magnetic separation tailings and production method thereof |
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| JPH03193828A (en) * | 1989-12-22 | 1991-08-23 | Nippon Steel Corp | Production of sintering raw material and sintered ore |
| JP2002167621A (en) * | 2000-11-30 | 2002-06-11 | Sumitomo Metal Ind Ltd | Method for producing iron sintered ore |
| CN101928823A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Sintering method of iron ore powder with high content of crystal water |
| CN108642272A (en) * | 2018-06-04 | 2018-10-12 | 山西建龙实业有限公司 | A kind of brown ocher high mixture ratio sintering method |
| CN109182735A (en) * | 2018-11-17 | 2019-01-11 | 武钢集团昆明钢铁股份有限公司 | Highly crystalline water limonite sintering method |
| CN109234523A (en) * | 2018-11-17 | 2019-01-18 | 武钢集团昆明钢铁股份有限公司 | A kind of highly crystalline water high mixture ratio limonite sintering method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH03193828A (en) * | 1989-12-22 | 1991-08-23 | Nippon Steel Corp | Production of sintering raw material and sintered ore |
| JP2002167621A (en) * | 2000-11-30 | 2002-06-11 | Sumitomo Metal Ind Ltd | Method for producing iron sintered ore |
| CN101928823A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Sintering method of iron ore powder with high content of crystal water |
| CN108642272A (en) * | 2018-06-04 | 2018-10-12 | 山西建龙实业有限公司 | A kind of brown ocher high mixture ratio sintering method |
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