CN104726630A - High-alkalinity composite metallized pellet for converter and production process thereof - Google Patents
High-alkalinity composite metallized pellet for converter and production process thereof Download PDFInfo
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- CN104726630A CN104726630A CN201510132452.XA CN201510132452A CN104726630A CN 104726630 A CN104726630 A CN 104726630A CN 201510132452 A CN201510132452 A CN 201510132452A CN 104726630 A CN104726630 A CN 104726630A
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Abstract
The invention relates to the technical field of metallurgical and mineral engineering and discloses a high-alkalinity composite metallized pellet for a converter and a production process thereof. The pellet comprises an inner core and a shell wrapping outside the inner core, wherein the inner core is prepared through mixing coal powder, limestone and cement according to the mass ratio of 100: (300-550): (4-7), the shell is prepared through mixing iron concentrate and bentonite according to the mass ratio of (1,500-1,800): (30-54), the granularity of the inner core is 20-25mm, and the thickness of the shell is 5-10mm; the outside of the shell is further covered with a layer of reducing agent. The production process comprises the steps of preparing the inner core, wrapping the shell to form the composite metallized pellet, wrapping the external wall of the composite metallized pellet with a reducing layer, distributing and drying the composite metallized pellet, carrying out reduction roasting on the composite metallized pellet, cooling and separating the high-temperature-reduction composite metallized pellet, and the like. According to the high-alkalinity composite metallized pellet and the production process thereof, through proportionally adding the limestone and the coal powder into the inner core, the internal reducing atmosphere of the pellet is strengthened, the reduction rate is increased, and the energy consumption is lowered.
Description
Technical field
The present invention relates to metallurgical and mineral engineering technology field, disclose a kind of coverter pig high alkalinity composition metal pellet and the production technique thereof that can substitute the volume particle size of steel scrap and Wingdale.
Background technology
At present, converter metallized pellet production technique used is: prepared burden by a certain percentage with wilkinite by iron ore concentrate higher for grade and after mixing, the pelletizing that granularity is 8 ~ 16mm is made by balling disc, pelletizing mixes with a certain proportion of reduction coal after cryodrying, mixture joins reduction stove (as shaft furnace, rotary kiln, tunnel furnace and rotary hearth furnace etc.) in reduce after, higher-grade can be obtained, the metallized pellet of high degree of metalization, the recovery time of producing metallized pellet due to this method is longer, production capacity is lower and energy consumption is higher, limit it to apply.Metallized pellet replaces steel scrap to join converter when utilizing, also need with addition of a certain proportion of dephosphorization and desulfurization granular unslaked lime used in furnace charge.
Summary of the invention
The object of this invention is to provide a kind of coverter pig high alkalinity composition metal pellet and production technique thereof, production time less with the granularity solving coverter pig metallized pellet be long, energy consumption is higher, also need with addition of the problem of unslaked lime when converter uses.
For solving upper technical problem, the technical solution used in the present invention is:
A kind of coverter pig high alkalinity composition metal pellet, it comprises kernel, is wrapped in the shell of kernel outside, the ratio that described kernel is 100:300 ~ 550:4 ~ 7 by coal powder, Wingdale, cement in mass ratio mixes, the ratio that described shell is 1500 ~ 1800:30 ~ 54 by iron ore concentrate and wilkinite in mass ratio mixes, the granularity of described kernel is 20 ~ 25mm, and the thickness of described shell is 5 ~ 10mm.
As a further improvement on the present invention, the outside of described shell is also coated with one deck reductive agent.
Further improve as of the present invention, described reductive agent is coal powder, and its quality is 5 ~ 8% of Iron Concentrate Quality in described shell, and wherein granularity is that the mass percentage content of-120 object coal powder particles is greater than 80%.
Further improve as of the present invention, the Iron grade of described iron ore concentrate be 64 ~ 66%, SiO
2content 2 ~ 4%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
Further improve as of the present invention, in described Wingdale the mass percentage content of CaO be 50 ~ 55%, SiO
2mass percentage content be 2 ~ 3%, wherein granularity is that the mass percentage content of-120 object limestone particles is greater than 80%.
Further improve as of the present invention, in described coal powder, the mass percent of fixed carbon, ash content, volatile matter is 72 ~ 76:11 ~ 15:11 ~ 14.
Further improve as of the present invention, in described high alkalinity composition metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is 1800N/ ball, and basicity is 2.0 ~ 4.0.
Based on the production technique of above-mentioned a kind of coverter pig high alkalinity composition metal pellet, it comprises the following steps:
Step one, prepare kernel, by coal powder, Wingdale, cement in mass ratio for the ratio of 100:300 ~ 550:4 ~ 7 is prepared burden and mixes, mixture adds the wetting rear standing 45min of a small amount of moisture, carry out disk or cylinder pelletizing when cement starts initial set, the mass percentage content controlling water in pelletizing in pelletizing is 7 ~ 10%, the granularity of kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 1500 ~ 1800:30 ~ 54 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped in by mixture on the outer wall of described kernel, form described shell, the thickness of shell is 5 ~ 10mm, obtains the wet composition metal pellet that granularity is 25 ~ 35mm;
Step 3, composition metal pellet outer wall parcel reducing zone, the wet composition metal pellet prepared in described step 2 is put into the coal powder that quality is Iron Concentrate Quality 5 ~ 8%, adopt balling disc to make its outside uniform fold one deck coal powder, form reducing zone;
The cloth of step 4, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 5, composition metal pellet, dried composition metal pellet through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, obtains high temperature reduction composition metal pellet in reduction kiln;
The cooling of step 6, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 5 gained is cooled to normal temperature, obtain the high alkalinity composition metal pellet product that degree of metalization is greater than 90%, a ultimate compression strength 1800N/ ball, basicity are 2.0 ~ 4.0.
Further improve as of the present invention, described reduction kiln is tunnel furnace or car bottom furnace or batch-type furnace.
Further improve as of the present invention, when the housing exterior of described composition metal pellet does not need reducing zone, described step 3 can be omitted.
Coverter pig high alkalinity composition metal pellet grading: mainly according to volume particle size composition metal pellet in reduction furnace after cloth, hole between pelletizing is larger, be conducive to the radiative transfer between pelletizing levels, reduce the heat transfer resistance of material and the temperature difference of levels material, make whole material through-thickness obtain homogeneous reduction, realize the reducing roasting of deep bed sintering.But when the granularity of pelletizing is more than 40mm, the heat that increase and pelletizing reduction due to pelletizing internal heat transfer thermal resistance need absorption certain, the internal-external temperature difference of pelletizing increases, and affects the decomposition of limestone of kernel and the gasification of coal thereupon.When pellet size is less than 20mm, the heat transfer between upper and lower pelletizing is mainly heat transfer by conduction, is unfavorable for the pelletizing reduction of deep bed sintering.In addition, when the coverter pig high alkalinity composition metal pellet of this explained hereafter uses as converter charge, for improving the ventilation property of converter, the granularity of composition metal pellet should increase as far as possible.Therefore, the granularity selection of coverter pig high alkalinity composite pellet of the present invention is 25 ~ 35mm.
Beneficial effect of the present invention:
(1) the present invention by high alkalinity composition metal pellet kernel with addition of Wingdale and coal powder, the calcining of Wingdale can be carried out in composite pellet reduction process, decomposition of limestone produce CO
2gas and coal generating gasification are reacted and are generated CO gas, and when wrapping up in the bed of material outside CO gas is diffused through outward by kernel, CO reacts with iron ore concentrate and generates CO
2, the CO of generation
2continue to participate in except gasification reaction except a part turns back to kernel, most of CO
2when wrapping up in coal layer outside outwards diffusing through, CO
2react with carbon generating gasification again and generate CO, CO gas is wrapped up in the bed of material and is participated in outside reduction of iron ore except a part turns back to, major part CO is out-diffusion in furnace cavity and burns, not only improve gas concentration and the speed of response of reduction of iron ore, and a part of fuel is provided in reduction stove, enhance pelletizing interior atmosphere, improve reduction rate, reduce energy consumption;
(2) the present invention is with addition of Wingdale and coal powder in composition metal pellet kernel, not only serves the effect of iron ore concentrate oxygenation reduction, and the CaO produced after decomposition of limestone serves the effect of adjustment composition metal pellet basicity;
(3) the invention solves powdered lime stone can not carry out calcining and powdered lime stone can not add the difficult problem that converter utilizes, effectively reduce the usage quantity of granular unslaked lime during converter steelmaking;
(4) the present invention is the degree of metalization improving metallized pellet, one deck coal powder has been wrapped up in as reducing zone outside pelletizing outside, gasification reaction is there is and releases CO gas in coal powder and iron ore concentrate in the process of heat temperature raising, part CO gas, to pelletizing internal divergence, makes reducing gas concentration and reduction rate in pelletizing be improved;
(5) granularity that the present invention produces is 25-35mm, carries the volume particle size high alkalinity composition metal pellet of Wingdale, uses for steel-making converter, improves homogeneity and the degree of metalization of pelletizing reduction.
Accompanying drawing explanation
Fig. 1 is the structural representation of coverter pig high alkalinity composition metal pellet;
Fig. 2 is the production technological process of coverter pig high alkalinity composition metal pellet.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
A kind of coverter pig high alkalinity composition metal pellet as shown in Figure 1, it comprises kernel 1, is wrapped in the shell 2 of kernel 1 outside, the ratio that kernel 1 is 100:300 ~ 550:4 ~ 7 by coal powder, Wingdale, cement in mass ratio mixes, the ratio that shell 2 is 1500 ~ 1800:30 ~ 54 by iron ore concentrate and wilkinite in mass ratio mixes, the granularity of kernel 1 is 20 ~ 25mm, and the thickness of shell 2 is 5 ~ 10mm.
The outside of shell 2 is also coated with one deck coal powder as reductive agent 3, and the quality of coal powder is 5 ~ 8% of Iron Concentrate Quality in shell 2, and wherein granularity is that the mass percentage content of-120 object coal powder particles is greater than 80%.
The Iron grade of iron ore concentrate is 64 ~ 66%, SiO
2content 2 ~ 4%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
In Wingdale the mass percentage content of CaO be 50 ~ 55%, SiO
2mass percentage content be 2 ~ 3%, wherein granularity is that the mass percentage content of-120 object limestone particles is greater than 80%.
In coal powder, the mass percent of fixed carbon, ash content, volatile matter is 72 ~ 76:11 ~ 15:11 ~ 14.
In high alkalinity composition metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is 1800N/ ball, and basicity is 2.0 ~ 4.0.
The production technique based on above-mentioned a kind of coverter pig high alkalinity composition metal pellet as shown in Figure 2, it comprises the following steps:
Step one, prepare kernel, by coal powder, Wingdale, cement in mass ratio for the ratio of 100:300 ~ 550:4 ~ 7 is prepared burden and mixes, mixture adds the wetting rear standing 45min of a small amount of moisture, carry out disk or cylinder pelletizing when cement starts initial set, the mass percentage content controlling water in pelletizing in pelletizing is 7 ~ 10%, the granularity of kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 1500 ~ 1800:30 ~ 54 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped in by mixture on the outer wall of described kernel, form described shell, the thickness of shell is 5 ~ 10mm, obtains the wet composition metal pellet that granularity is 25 ~ 35mm;
Step 3, composition metal pellet outer wall parcel reducing zone, the wet composition metal pellet prepared in described step 2 is put into the coal powder that quality is Iron Concentrate Quality 5 ~ 8%, adopt balling disc to make its outside uniform fold one deck coal powder, form reducing zone;
The cloth of step 4, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 5, composition metal pellet, dried composition metal pellet through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, obtains high temperature reduction composition metal pellet in reduction kiln;
The cooling of step 6, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 5 gained is cooled to normal temperature, obtain the high alkalinity composition metal pellet product that degree of metalization is greater than 90%, a ultimate compression strength 1800N/ ball, basicity are 2.0 ~ 4.0.
Reduction kiln described in this production technique is tunnel furnace or car bottom furnace or batch-type furnace.
When the housing exterior of composition metal pellet does not need reducing zone, described step 3 can be omitted.
The present invention produce coverter pig high alkalinity composition metal pellet, by kernel with addition of Wingdale and coal powder, Wingdale decomposes produce CO
2participate in the gasification reaction of coal as oxygenation agent, enhance pelletizing interior atmosphere, improve reduction rate, reduce energy consumption.The granularity that the present invention produces is 25 ~ 35mm, carries the volume particle size high alkalinity composition metal pellet of Wingdale, for steel-making converter, decreases the ratio that steel-making adds granular unslaked lime, has saved production cost, improve production efficiency.
Claims (10)
1. a coverter pig high alkalinity composition metal pellet, it comprises kernel (1), is wrapped in the outside shell (2) of kernel (1), it is characterized in that: the ratio that described kernel (1) is 100:300 ~ 550:4 ~ 7 by coal powder, Wingdale, cement in mass ratio mixes, the ratio that described shell (2) is 1500 ~ 1800:30 ~ 54 by iron ore concentrate and wilkinite in mass ratio mixes, the granularity of described kernel (1) is 20 ~ 25mm, and the thickness of described shell (2) is 5 ~ 10mm.
2. coverter pig high alkalinity composition metal pellet according to claim 1, is characterized in that: the outside of described shell (2) is also coated with one deck reductive agent (3).
3. coverter pig high alkalinity composition metal pellet according to claim 2, it is characterized in that: described reductive agent (3) is coal powder, its quality is 5 ~ 8% of Iron Concentrate Quality in described shell (2), and wherein granularity is that the mass percentage content of-120 object coal powder particles is greater than 80%.
4. the coverter pig high alkalinity composition metal pellet according to claim 1 or 2 or 3, is characterized in that: the Iron grade of described iron ore concentrate is 64 ~ 66%, SiO
2content 2 ~ 4%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
5. the coverter pig high alkalinity composition metal pellet according to claim 1 or 2 or 3, is characterized in that: in described Wingdale the mass percentage content of CaO be 50 ~ 55%, SiO
2mass percentage content be 2 ~ 3%, wherein granularity is that the mass percentage content of-120 object limestone particles is greater than 80%.
6. the coverter pig high alkalinity composition metal pellet according to claim 1 or 2 or 3, is characterized in that: in described coal powder, the mass percent of fixed carbon, ash content, volatile matter is 72 ~ 76:11 ~ 15:11 ~ 14.
7. the coverter pig high alkalinity composition metal pellet according to claim 1 or 2 or 3, is characterized in that: in described high alkalinity composition metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is 1800N/ ball, and basicity is 2.0 ~ 4.0.
8. the production technique of a kind of coverter pig high alkalinity composition metal pellet according to claim 1, is characterized in that: it comprises the following steps:
Step one, prepare kernel, by coal powder, Wingdale, cement in mass ratio for the ratio of 100:300 ~ 550:4 ~ 7 is prepared burden and mixes, mixture adds the wetting rear standing 45min of a small amount of moisture, carry out disk or cylinder pelletizing when cement starts initial set, the mass percentage content controlling water in pelletizing in pelletizing is 7 ~ 10%, the granularity of kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 1500 ~ 1800:30 ~ 54 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped in by mixture on the outer wall of described kernel, form described shell, the thickness of shell is 5 ~ 10mm, obtains the wet composition metal pellet that granularity is 25 ~ 35mm;
Step 3, composition metal pellet outer wall parcel reducing zone, the wet composition metal pellet prepared in described step 2 is put into the coal powder that quality is Iron Concentrate Quality 5 ~ 8%, adopt balling disc to make its outside uniform fold one deck coal powder, form reducing zone;
The cloth of step 4, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 5, composition metal pellet, dried composition metal pellet through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, obtains high temperature reduction composition metal pellet in reduction kiln;
The cooling of step 6, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 5 gained is cooled to normal temperature, obtain the high alkalinity composition metal pellet product that degree of metalization is greater than 90%, a ultimate compression strength 1800N/ ball, basicity are 2.0 ~ 4.0.
9. the production technique of coverter pig high alkalinity composition metal pellet according to claim 8, is characterized in that: described reduction kiln is tunnel furnace or car bottom furnace or batch-type furnace.
10. the production technique of coverter pig high alkalinity composition metal pellet according to claim 8, is characterized in that: when the housing exterior of described composition metal pellet does not need reducing zone, can omit described step 3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105087913A (en) * | 2015-08-04 | 2015-11-25 | 江苏省冶金设计院有限公司 | Novel pellet metallurgy method |
| CN106282549A (en) * | 2016-09-12 | 2017-01-04 | 苏州大学 | A kind of chlorination pelletizing and preparation method thereof |
| CN106702153A (en) * | 2016-12-06 | 2017-05-24 | 江苏省冶金设计院有限公司 | Method and system for preparing metallized pellets |
| CN108609873A (en) * | 2018-05-15 | 2018-10-02 | 鞍钢股份有限公司 | With silicon-carbon bisgallic acid degree composite pellet and preparation method thereof in a kind of modification of vessel slag |
| CN110079668A (en) * | 2019-04-25 | 2019-08-02 | 东北大学 | A kind of preparation method and application of bilayer carbonaceous pelletizing |
| CN111979424A (en) * | 2020-08-24 | 2020-11-24 | 云南华鼎再生资源开发有限公司 | Metallurgy method of high-sulfur lead slag containing zinc and tin |
| CN114350942A (en) * | 2021-12-14 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for preparing pellets by utilizing superfine high-iron and high-sodium iron concentrates |
| WO2023142481A1 (en) * | 2022-01-25 | 2023-08-03 | 中冶长天国际工程有限责任公司 | Direct reduction process and direct reduction apparatus for iron-containing composite pellets |
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| CN105087913A (en) * | 2015-08-04 | 2015-11-25 | 江苏省冶金设计院有限公司 | Novel pellet metallurgy method |
| CN106282549A (en) * | 2016-09-12 | 2017-01-04 | 苏州大学 | A kind of chlorination pelletizing and preparation method thereof |
| CN106282549B (en) * | 2016-09-12 | 2018-05-29 | 苏州大学 | A kind of chlorination pelletizing and preparation method thereof |
| CN106702153A (en) * | 2016-12-06 | 2017-05-24 | 江苏省冶金设计院有限公司 | Method and system for preparing metallized pellets |
| CN108609873A (en) * | 2018-05-15 | 2018-10-02 | 鞍钢股份有限公司 | With silicon-carbon bisgallic acid degree composite pellet and preparation method thereof in a kind of modification of vessel slag |
| CN110079668A (en) * | 2019-04-25 | 2019-08-02 | 东北大学 | A kind of preparation method and application of bilayer carbonaceous pelletizing |
| CN111979424A (en) * | 2020-08-24 | 2020-11-24 | 云南华鼎再生资源开发有限公司 | Metallurgy method of high-sulfur lead slag containing zinc and tin |
| CN114350942A (en) * | 2021-12-14 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for preparing pellets by utilizing superfine high-iron and high-sodium iron concentrates |
| WO2023142481A1 (en) * | 2022-01-25 | 2023-08-03 | 中冶长天国际工程有限责任公司 | Direct reduction process and direct reduction apparatus for iron-containing composite pellets |
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Application publication date: 20150624 |