CN102051474B - Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same - Google Patents
Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same Download PDFInfo
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- CN102051474B CN102051474B CN2010105925072A CN201010592507A CN102051474B CN 102051474 B CN102051474 B CN 102051474B CN 2010105925072 A CN2010105925072 A CN 2010105925072A CN 201010592507 A CN201010592507 A CN 201010592507A CN 102051474 B CN102051474 B CN 102051474B
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Abstract
The invention discloses a Cr-Fe powder ore cold-hardened pellet binder comprising the following components in percentage by weight: 70-80 percent of silicon micro powder, 19.81-29.78 percent of light calcined magnesia and 0.19-0.22 percent of trimeric sodium phosphate. The invention also discloses a process for pelleting by using the binder, which comprises the following steps of: adding 6-8 percent by weight of binder in 76-84 percent by weight of Cr-Fe powder ore; then adding 4-8 percent by weight of blue carbon powder; after dryly mixing for 2-3min by an edge milling type stirring mill, adding 6-8 percent by weight of reinforcer, and wetly mixing for 5-10min; then discharging and putting into a roller type ball press for pressing to form pellets; and then drying at the temperature of 150-200 DEG C and the wind speed of 1.0-1.8m/s for 30-40min to obtain finished Cr-Fe pellets. The carbon ferrochrome produced by the invention has the advantages of increasing the yield by 15-20 percent, reducing the electricity consumption by 12-16 percent and lowering the comprehensive cost by 10-12 percent.
Description
Technical field
The present invention relates to a kind of sticker of ferrochrome fine ore system ball, relate in particular to ferrochrome fine ore cooled agglomerated pellet sticker and utilize this sticker to make the technology of ball.
Background technology
In short supply day by day along with chromium ore resource, the lump ore supply gradually reduces, and fine ore system ball replaces lump ore and produces carbon ferrochrome, has become at present and even main production situation from now on.Fine ore system ball has dual mode, adopts agglomerates of sintered pellets in early days, and it is to obtain the higher pellet of intensity through the sintering more than 1000 ℃; Recent development goes out cooled agglomerated pellet, and it only needs oven drying at low temperature, just can obtain the pellet with sufficient intensity.Pelletizing high temperature sintering operation has been cancelled in the application of cooled agglomerated pellet, has not only saved investment, but also is a novel process of saving energy and reduce the cost and reducing environmental pollution, is worthy to be popularized.
Ironmaking is produced and has been promoted pellet technology for a long time, and many units have continued to use iron ore pellet binder and production technique in the making of chrome pellets.But because the ferrochrome fine ore is smelted characteristic and iron ore differs greatly, by contrast, the reduction difficulty of ferrochrome fine ore is bigger, and the smelting equipment that is adopted is also far different, thereby to indiscriminately imitate fully be impracticable.
Early stage cold solid iron ore pellet binder is mainly slaked lime and syrup.Slaked lime has certain viscosity, makes pelletizing have certain intensity just, makes Ca (OH) through " health "
2Absorb CO
2Change CaCO
3, obtain higher-strength.But CaCO
3At 900 ℃, decompose and emit CO
2, will lose cohesive strength, make the pelletizing efflorescence.Slaked lime adds syrup, in heat-processed, can generate new bonding phase---Calciofon, makes pelletizing keep certain intensity.But the syrup source is few, can not satisfy the large-scale commercial prodn needs.The cold solid sticker of development in the recent period (claiming " pelletizing adhesive special " again) mainly is the organic binder bond that contains humic acids or SEPIGEL 305, and they can give higher low temperature intensity of pelletizing and hygrometric state plasticity.In the blast furnace reducing atmosphere, heat, meeting " carbonization " generates the carbon granules node, and breeze is bonded together, and makes pelletizing have certain hot strength.But in smelting the hot stove in ore deposit of ferrochrome, charge level temperature up to 800 ℃ about, simultaneously, contain oxygen in the furnace gas, organic binder bond can burn rapidly and lose totally, makes pelletizing lose intensity and efflorescence, causes the working of a furnace to worsen, output descends, energy consumption rises.Thereby development ferrochrome fine ore cooled agglomerated pellet sticker, be the task of top priority.
Summary of the invention
One of the object of the invention is to provide a kind of in the process of smelting ferrochrome, and the ferrochrome pelletizing can worsen the working of a furnace because of losing the intensity efflorescence, and output descends, the ferrochrome fine ore cooled agglomerated pellet sticker that energy consumption rises;
Two of purpose is the pellet forming process that provides a kind of and said sticker to be complementary.
For this reason; The technical scheme that is adopted is: a kind of ferrochrome fine ore cooled agglomerated pellet sticker; The each component and the weight percent thereof of this sticker are respectively: silicon powder is 70 ﹪～80 ﹪, and light calcined magnesia is 19.81 ﹪～29.78 ﹪, and tripoly phosphate sodium STPP is 0.19%～0.22 ﹪; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material.
A kind of technology of utilizing said sticker system ball: in weight ratio is 76%～84% ferrochrome fine ore, add the said sticker that weight ratio is 6 ﹪～8 ﹪, add weight ratio again and be 4%～8% blue carbon dust, through muller formula stirrer do mix 2～3 minutes after; Added weight is than the reinforcer that is 6 ﹪～8 ﹪, and wet mixing 5～10 minutes can discharging get into pair roller type ball press compacting balling-up; Again through 150 ℃～200 ℃; Wind speed 1.0m/s～1.8m/s, 30 minutes～40 minutes time drying gets ferrochrome pelletizing finished product.
The principle of sticker of the present invention by: use micro mist cohesion adhesive theory and is developed, used silicon powder has two big characteristics in the prescription:
The first, silicon powder can form colloid in water, and the micro mist surface generates silanol bonds Si-OH, can breeze be sticked together, and makes the certain wet tenacity of pelletizing tool.The colloid dehydration of dry back changes the silica long-chain of Si-O-Si-O form into by the Si-OH key, has further increased the bonding force between ore particle, produces higher low temperature dry strength;
The second, silicon powder is highly active unsetting (noncrystal) SiO
2, it is more than 400 ℃, just can with picrochromite (MgOCr in the chrome ore
2O
3) reaction, capture MgO wherein, generate new high temperature bond phase Magnesium Silicate q-agent (MgOSiO
2), make pelletizing have higher medium temperature intensity.Simultaneously, discharge Cr
2O
3, the Cr that in sharp crystalline substance, discharges
2O
3, have higher chemically reactive, be prone to and reductive agent (carbon dust) reaction, obtain the carbon containing ferrochrome, thereby accelerated the reduction of ore.Along with temperature raises, silicon powder about 800 ℃, can with the Al in the chrome ore
2O
3Reaction begins to generate high temperature bond phase mullite, and during to 1200 ℃, mullite is separated out in a large number, and crystallization, makes pelletizing have higher high temperature strength.
The adding of light calcined magnesia fine powder in the prescription equally also has two kinds of effects:
Effect one, light calcined magnesia fine powder and silicon powder reaction under lesser temps (≤300 ℃), just can form the bonding reticulattion between ore particle, make it to have higher low temperature intensity;
Act on two, can improve the reducing property of chromite ore fine.MgO/ Al in some ferrochrome fine ore
2O
3Than＜1, because Al
2O
3Fusing point is high, and it is thick in the production process slag to be become sticky, and the reduction ratio of chromium descends.Suitably improve MgO, make MgO/ Al
2O
3Than>=1, slag will be thinning, helps Cr like this
2O
3Reduction, improve the recovery of chromium.
Ferrochrome fine ore cooled agglomerated pellet sticker of the present invention is compared with commercially available " pelletizing adhesive special ", has following characteristics.
1, from hygrometric state to dry state,, can both interact to high temperature by low temperature with the ferrochrome fine ore; Generate new bonding phase; Thereby guaranteed ferrochrome fine ore pelletizing by pressure ball → drying → reduction, each stage desirable strength in the whole process has been eliminated the fragmentation and the powder phenomenon-tion of chrome pellets to greatest extent.Compare with existing sticker, smelt output and improve 15 ﹪～20 ﹪, power consumption reduces by 12 ﹪～16 ﹪, comprehensive cost 10 ﹪～12 ﹪ that descend.
2, this novel ferrochrome fine ore cooled agglomerated pellet sticker, composition wherein are the material that ferrochrome smelting institute must adding, in mine heat furnace smelting ferrochrome furnace charge, allocate a large amount of silica (SiO into
2) and a certain amount of MgO mineral (like magnesia) that contain, to improve the chrome ore reduction characteristic and to form the suitable slag of fusing point, improve the recovery of chromium.Though the consumption of this sticker (quality 6 ﹪～8 ﹪) is greater than existing special-purpose organic binder bond (quality 1.5 ﹪), price is merely the latter's 30%.What is more important, it can guarantee that the working of a furnace is good, realizes the high yield and saving energy purpose, comprehensive benefit is greater than currently available products.
3, contain multiple promotion chromite reductive material in this stick, more help carbon ferrochrome production, this be currently available products can't be obtained.
4, the made pelletizing of this caking agent not only has wet tenacity and low temperature dry strength, and higher middle gentle hot strength is arranged, and guarantees pelletizing breaking and Dusting not in adding thermal reduction.Time (10 pelletizings fall within on the steel plate in the 0.5m height in wet bulb group's intensity >=4; Chip-proof average time), dry bulb intensity >=8 time (10 balls drop down onto on the steel plate chip-proof average time from 1 meter high); Dried pelletizing compressive strength＞550N/ (diameter is 20 ㎜); Greater than the prepared pellet strength of existing sticker (300 ~ 400N/), reduce returns, reduce the power consumption of manual work and energy.
5, pelletizing has good anti-knocking property and hot strength.Pelletizing under the condition of 10 kilograms of weights pressurizations, is directly sent in 1000 ℃ the High Temperature Furnaces Heating Apparatus after 180 ℃, 30 minutes dryings, does not ftracture, not efflorescence; Be warming up to 1350 ℃ of insulations 2 hours again, little distortion only takes place in spheroid.
Description of drawings
Fig. 1 is a sticker manufacture craft schema;
Fig. 2 is cold solid chrome pellets manufacture craft schema.
Embodiment
Reinforcer among the following embodiment is that weight ratio is 4%, to add weight ratio be that 96% water dissolution forms to the NaOH solution of concentration 96%.
Embodiment 1, a kind of novel ferrochrome fine ore cooled agglomerated pellet sticker, and its each component and weight are respectively: silicon powder 29kg, light-magnesite powder 12 kg, tripoly phosphate sodium STPP 0.08 kg; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material; Utilize said sticker to make the technology of ball, get said sticker 20kg, join South Africa ferrochrome fine ore 213kg; Blue carbon dust 13.3 kg in Shenmu County are after doing mixed 2-3 minutes on the muller formula stirrer, with reinforcer; 20kg continues the powerful discharging after 10 minutes of stirring, and is pressed into the pelletizing that diameter is 20 ㎜ through the pair roller type ball press; Time (10 pelletizings fall within on the steel plate in the 0.5m height in wet bulb group's intensity >=4; Chip-proof average time), dry bulb intensity >=8 time (10 balls drop down onto on the steel plate chip-proof average time from 1 meter high).Pelletizing compressive strength＞560N/ behind 180 ℃, wind speed 1.0m/s～1.8m/s, oven dry in 30 minutes; Under 1000 ℃ heat-flash, do not ftracture, not efflorescence, under the 10 kg/ condition of exerting pressure, through 1350 ℃ the insulation 2 hours, about 20% compression set only takes place, in whole heating, reduction process, kept the integrity of pelletizing preferably.
Embodiment 2, a kind of novel ferrochrome fine ore cooled agglomerated pellet sticker, and its each component and weight are respectively: silicon powder 27.5kg, light-magnesite powder 9 kg, tripoly phosphate sodium STPP 0.07 kg; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material; Utilize said sticker to make the technology of ball, get said sticker 20 kg, join South Africa ferrochrome fine ore 110 kg; Brazil ferrochrome fine ore 110 kg, blue carbon dust 16 kg in Shenmu County do in muller formula stirrer and mixed 2-3 minutes; Add reinforcer 20kg; Continue powerful the stirring 10 minutes, discharging pair roller rod ball press is pressed into the pelletizing that diameter is 20 ㎜.0.5 meter dropping strength >=5 of wet bulb time; Behind 180 ℃, wind speed 1.0m/s～1.8m/s, oven dry in 30 minutes, 1 meter dropping strength >=15 time.1000 ℃ down shock heating, do not ftracture, not efflorescence, under 10 kg/ the condition of exerting pressure, after the heating in 1350 ℃, 2 hours, 22% compression set only takes place, kept the integrity of pelletizing preferably.
Instance 3, a kind of novel ferrochrome fine ore cooled agglomerated pellet sticker, its each component and weight are respectively: silicon powder 32 kg, light-magnesite powder 8 kg, tripoly phosphate sodium STPP 0.08 kg; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material; Utilize said sticker to make the technology of ball, get said sticker 28kg, join South Africa ferrochrome fine ore 170 kg; Motor adds this ferrochrome fine ore 170 kg; Blue powdered carbon 20 kg in Shenmu County, in muller formula stirrer, do mix 2-3 minutes can, with reinforcer 30kg; Continue powerful the stirring after 10 minutes, discharging is pressed into the pelletizing that diameter is 20 ㎜ through the pair roller ball press.0.5 meter dropping strength >=4 of wet bulb time; Behind 180 ℃, wind speed 1.0m/s～1.8m/s, oven dry in 30 minutes, 2 meters dropping strength >=8 time; Dry bulb through 1000 ℃ shock heatingly do not ftracture, not efflorescence; Added thermal reduction in 1350 ℃, 2 hours, spheroid is compression set 18% only, has kept the integrity of pelletizing.
Embodiment 4, a kind of novel ferrochrome fine ore cooled agglomerated pellet sticker, and its each component and weight are respectively: silicon powder 26 kg, light-magnesite powder 9.5kg, tripoly phosphate sodium STPP 0.08 kg; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material; Utilize said sticker to make the technology of ball, get said sticker 30kg, join South Africa ferrochrome fine ore 155 kg; Motor adds this ferrochrome fine ore 200 kg; Blue powdered carbon 32.3 kg in Shenmu County, in muller formula stirrer, do mix 2～3 minutes can, with reinforcer 34.6kg; Continue powerful the stirring after 10 minutes, discharging is pressed into the pelletizing that diameter is 20 ㎜ through the pair roller ball press.0.5 meter dropping strength >=4 of wet bulb time; Behind 180 ℃, wind speed 1.0m/s～1.8m/s, oven dry in 30 minutes, 1.5 meters dropping strength >=8 time; Dry bulb through 1000 ℃ shock heatingly do not ftracture, not efflorescence; Added thermal reduction in 1350 ℃, 2 hours, spheroid is compression set 19% only, has kept the integrity of pelletizing.
Embodiment 5, get novel ferrochrome fine ore cooled agglomerated pellet sticker, and its each component and weight are respectively: silicon powder 40 kg, light-magnesite powder 14kg, tripoly phosphate sodium STPP 0.11kg; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material; Utilize said sticker to make the technology of ball, get said sticker 35kg, join South Africa ferrochrome fine ore 250kg; Motor adds this ferrochrome fine ore 132 kg; Blue powdered carbon 23 kg in Shenmu County, in muller formula stirrer, do mix 2-3 minutes can, with reinforcer 32kg; Continue powerful the stirring after 10 minutes, discharging is pressed into the pelletizing that diameter is 20 ㎜ through the pair roller ball press.0.5 meter dropping strength >=4 of wet bulb time; Behind 180 ℃, wind speed 1.0m/s～1.8m/s, oven dry in 30 minutes, 1.5 meters dropping strength >=8 time; Dry bulb through 1000 ℃ shock heatingly do not ftracture, not efflorescence; Added thermal reduction in 1350 ℃, 2 hours, spheroid is compression set 19% only, has kept the integrity of pelletizing.
Claims (3)
1. ferrochrome fine ore cooled agglomerated pellet sticker, it is characterized in that: the each component and the weight percent thereof of said sticker are respectively: silicon powder is 70 ﹪～80 ﹪, and light calcined magnesia is 19.81 ﹪～29.78 ﹪, and tripoly phosphate sodium STPP is 0.19%～0.22 ﹪; Said three kinds of materials in muller formula stirrer, are stirred through powerful, process homogeneous mixture of material.
2. technology of utilizing the sticker system ball of claim 1 is characterized in that: in weight ratio is 76%～84% ferrochrome fine ore, add the said sticker that weight ratio is 6 ﹪～8 ﹪, add weight ratio again and be 4%～8% blue carbon dust; After muller formula stirrer is done mixed 2～3 minutes; Adding weight ratio again is the reinforcer of 6 ﹪～8 ﹪, and wet mixing 5～10 minutes can discharging get into pair roller type ball press compacting balling-up; Again through 150 ℃～200 ℃; Wind speed 1.0m/s～1.8m/s, 30 minutes～40 minutes time drying gets ferrochrome pelletizing finished product.
3. technology according to claim 2 is characterized in that: said reinforcer is that weight ratio is 4%, to add weight ratio be that 96% water dissolution forms to the NaOH solution of concentration 96%.
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|---|---|---|---|
| CN2010105925072A CN102051474B (en) | 2010-12-17 | 2010-12-17 | Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same |
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|---|---|---|---|
| CN2010105925072A CN102051474B (en) | 2010-12-17 | 2010-12-17 | Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same |
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| CN102051474B true CN102051474B (en) | 2012-03-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140000834A1 (en) * | 2012-06-28 | 2014-01-02 | Yieh United Steel Corp. | Method for Manufacturing an Austenitic Stainless Steel from a Nickel Laterite Ore and a Chromite Ore |
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| CN101705356A (en) * | 2009-12-07 | 2010-05-12 | 中南大学 | Sintering technology of ferrochrome mineral powder |
-
2010
- 2010-12-17 CN CN2010105925072A patent/CN102051474B/en not_active Expired - Fee Related
Patent Citations (4)
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|---|---|---|---|---|
| WO2004061138A1 (en) * | 2003-01-07 | 2004-07-22 | Kabushiki Kaisha Kobe Seiko Sho | Method for reducing chromium containing raw material |
| CN101538629A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Process and device for smelting chromium irons and chromium-containing molten iron by using chromium ore powder |
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
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| US20140000834A1 (en) * | 2012-06-28 | 2014-01-02 | Yieh United Steel Corp. | Method for Manufacturing an Austenitic Stainless Steel from a Nickel Laterite Ore and a Chromite Ore |
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