CN101045956A - Additive for producing hard-to-calcine iron ore pellt - Google Patents
Additive for producing hard-to-calcine iron ore pellt Download PDFInfo
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- CN101045956A CN101045956A CN 200710034839 CN200710034839A CN101045956A CN 101045956 A CN101045956 A CN 101045956A CN 200710034839 CN200710034839 CN 200710034839 CN 200710034839 A CN200710034839 A CN 200710034839A CN 101045956 A CN101045956 A CN 101045956A
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- iron ore
- additive
- preheating
- roasting
- ball
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Abstract
The additive for producing hard-to-calcine iron ore pellet consists of Fe3O4 in 60-80 wt%, CaO in 5-20 wt%, and B2O3 in 5-20 wt%. It is added into hard-to-calcine iron ore pellet material in the amount of 1-5 wt% after being ground to fineness below 0.074 mm. Adding the additive can lower the pre-heating temperature of the hard-to-calcine pellet of hematite, limonite, etc by about 100 deg.c, shorten the pre-heating time by over 1/2, lower the pellet roasting temperature by about 50 deg.c and shorten the roasting time by over 1/3.
Description
Technical field
The present invention relates to a kind of additive, particularly relate to a kind of additive that hard-to-calcine iron ore pellt is produced that is used for.
Background technology
At the iron ore pellets production field, rhombohedral iron ore and limonite belong to difficult roasting raw material.For a long time, China iron ore pellets factory owner will be raw material with the magnetite concentrate, continuous expansion along with China's Iron And Steel Industry scale, demand to iron ore pellets is also increasing year by year, domestic resource of magnetite supply day is becoming tight, therefore, to prepare ironmaking oxidized pellet significant for difficult roasting iron ore deposit such as red, limonite of research and utilization.
Studies show that utilize bloodstone to prepare oxide pellet, its consolidation mechanism is mainly Fe
2O
3Recrystallization under grain growth and the high temperature.Below 1200 ℃, the ore particles of rhombohedral iron ore and pellet structure keep its original form always, though each particle is close to each other, do not have any connection.When having only temperature to reach 1300 ℃, just can observe crystal grain and obviously grow up, just form the cross structure at initial stage between the small-crystalline.To 1350 ℃ the time, can observe recrystallize.Meanwhile, the ultimate compression strength of pellet also raises with temperature increases.But sintering temperature can not be too high, and when temperature surpassed 1350 ℃, bloodstone just began to decompose: 6Fe
2O
3→ 4Fe
3O
4+ O
2, generating magnetic iron ore and oxygen, the result will cause the decline of pellet strength.This shows, utilizes bloodstone to prepare oxidation ball ore deposit, and the sintering temperature interval that the preheating and baking temperature height of its requirement, time are grown, suit is narrow, thereby in actual production process equipment material and production operation has been proposed more strict requirement.Utilize limonite to prepare oxide pellet, its preheating and baking need experience crystallization water decomposition, Fe
2O
3Recrystallization and pelletizing densification process under grain growth and the high temperature, except need experience crystallization water decomposable process in advance, it is similar that its follow-up consolidation mechanism and bloodstone prepare oxide pellet, therefore, utilizes limonite to prepare oxide pellet and have equally the problems referred to above in actual production.
The preheating and baking performance of, limonite pelletizing red, Chinese scholars in order to improve internally join carbon and with addition of magnetite, add slaked lime, Wingdale, rhombspar etc. and carried out systematic study.Result of study shows, in join the preheating and baking performance that carbon can improve hematite pellets to a certain extent, but effect is not remarkable, and green ball strength and burst temperature also can descend to some extent because of the interior carbon of joining.Must be with addition of its proportioning of magnetite in the preheating and baking performance that could significantly improve hematite pellets more than 30%, this method must a large amount of magnetite of outsourcing.Interpolation slaked lime, Wingdale, rhombspar etc. also can improve the preheating and baking performance of hematite pellets, but the product of producing is the fluxed pellets ore deposit, will change the burden structure of blast furnace when being used for blast furnace ironmaking, and the also difficult control of its production process.
Preheating and baking temperature height, the time red for effective solution, that the limonite pelletizing exists in the preheating and baking process, sintering temperature interval long, that suit was narrow, and bring thus in actual production process, equipment material and production operation are required the problems such as height, realize that the bloodstone that utilizes efficient, low consumption prepares ironmaking oxidized pellet, special proposition the present invention.
Summary of the invention
Technical problem to be solved by this invention provides a kind of preheating, maturing temperature that significantly reduces hematite pellets in the preheating and baking process, shortens the preheating and baking time, the interval wide additive that is used for hard-to-calcine iron ore pellt production of suitable maturing temperature.
In order to solve the problems of the technologies described above, the additive for hard-to-calcine iron ore pellt production provided by the invention is by B
2O
3, CaO and Fe
3O
4Form, wherein Fe
3O
4Mass percent accounts for 60%～80%, the CaO mass percent accounts for 5%～20%, B
2O
3Mass percent accounts for 5%～20%, and granularity is less than 0.074mm.
In hard-to-calcine iron ore pellt, add mass percent during use and be 1%～5% additive, when proportioning is got low value, CaO, B in the additive
2O
3The mass percent capping.During use it is finely ground to granularity less than below the 0.074mm.
Adopt the additive of technique scheme, can make the preheat temperature red, that the limonite pelletizing is suitable reduce about 100 ℃, shorten preheating time more than 1/2, sintering temperature reduces about 50 ℃, and roasting time shortens more than 1/3.
Principle of the present invention is: through the additive of fine grinding, Fe wherein
3O
4In the pellet roasting process, can form Fe
2O
3The crystallite bond structure, wherein CaO energy and Fe
2O
3Forming calcium ferrite is low melting point, strengthens bloodstone grain surface particle transfer ability, and B wherein
2O
3Can significantly strengthen solid-state diffusion.The above-mentioned effect of additive has promoted that forming the crystallite key between the adjacent particle under low preheat temperature connects crystallization, makes Fe in the pelletizing in high-temperature calcination process
2O
3Recrystallization is good, Fe
2O
3The crystal interconnection makes the pelletizing endoparticle connect into fine and close, a uniform integral body, thereby the intensity of pellet is improved in flakes.
Advantage of the present invention mainly is: the additive wide material sources, cheap, proportioning is few, substantially do not change the chemical constitution of finished product pellet, applicable to the production in hard-to-calcine iron ore pellt ore deposits such as red, brown iron ore concentrate, can significantly reduce preheating, the maturing temperature of hematite pellets, shorten the preheating and baking time, help enhancing productivity, cut down the consumption of energy.It is narrow effectively to solve long, the suitable maturing temperature interval of the preheating and baking temperature height red, that limonite concentrate pelletizing exists in the preheating and baking process, time, and bring thus in actual production process, equipment material and production operation are required problems such as height, realize the iron ore pellets production of difficult roasting raw materials such as utilizing of efficient, low consumption is red, limonite.
Embodiment
Embodiment 1, certain red iron ore concentrate, and its main chemical compositions is: TFe 66.54%, FeO 0.8%, SiO
21.21%, Al
2O
31.51%, CaO 0.028%, MgO 0.045%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 21min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 430N/, and roasting ball ultimate compression strength only reaches 1860N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 60%, CaO accounts for 20%, B
2O
3Account for 20% additive be finely ground to granularity less than below the 0.074mm, 1% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 9min, 1270 ℃ of sintering temperatures, under the condition of roasting time 12min, pre-hot-bulb compression strength can reach 441N/, and intensity of roasting can reach 2590N/.
Embodiment 2, certain red iron ore concentrate, and its main chemical compositions is: TFe 66.54%, FeO 0.8%, SiO
21.21%, Al
2O
31.51%, CaO 0.028%, MgO 0.045%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 21min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 443N/, and roasting ball ultimate compression strength only reaches 1860N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 80%, CaO accounts for 10%, B
2O
3Account for 10% additive be finely ground to granularity less than below the 0.074mm, 3% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 9min, 1260 ℃ of sintering temperatures, under the condition of roasting time 12min, pre-hot-bulb compression strength can reach 458N/, and intensity of roasting can reach 2690N/.
Embodiment 3, certain red iron ore concentrate, and its main chemical compositions is: TFe 66.54%, FeO 0.8%, SiO
21.21%, Al
2O
31.51%, CaO 0.028%, MgO 0.045%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking more after drying, 1000 ℃ of preheating temperatures, warm up time 21min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 443N/, and roasting ball ultimate compression strength only reaches 1860N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 70%, CaO accounts for 15%, B
2O
3Account for 15% additive be finely ground to granularity less than below the 0.074mm, the ratio of mass percent 5% is allocated in the compound then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 9min, 1250 ℃ of sintering temperatures, under the condition of roasting time 13min, pre-hot-bulb compression strength can reach 490N/, and intensity of roasting can reach 2700N/.
Embodiment 4, certain brown iron ore concentrate, and its main chemical compositions is: TFe 56.55%, SiO
29.53%, Al
2O
31.69%, CaO 0.6%, MgO 0.03%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 25min, 1310 ℃ of maturing temperatures, under the condition of roasting time 25min, pre-hot-bulb ultimate compression strength is 409N/, and roasting ball ultimate compression strength only reaches 1650N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 60%, CaO accounts for 20%, B
2O
3Account for 20% additive be finely ground to less than below the 0.074mm, 1% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 12min, 1270 ℃ of sintering temperatures, under the condition of roasting time 15min, pre-hot-bulb compression strength can reach 423N/, and intensity of roasting can reach 2210N/.
Embodiment 5, certain brown iron ore concentrate, and its main chemical compositions is: TFe 56.55%, SiO
29.53%, Al
2O
31.69%, CaO 0.6%, MgO 0.03%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 25min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 409N/, and roasting ball ultimate compression strength only reaches 1650N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 60%, CaO accounts for 20%, B
2O
3Account for 20% additive be finely ground to granularity less than below the 0.074mm, 3% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 12min, 1260 ℃ of sintering temperatures, under the condition of roasting time 15min, pre-hot-bulb compression strength can reach 448N/, and intensity of roasting can reach 2430N/.
Embodiment 6, certain brown iron ore concentrate, and its main chemical compositions is: TFe 56.55%, SiO
29.53%, Al
2O
31.69%, CaO 0.6%, MgO 0.03%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 25min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 409N/, and roasting ball ultimate compression strength only reaches 1650N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 70%, CaO accounts for 15%, B
2O
3Account for 15% additive be finely ground to granularity less than below the 0.074mm, 5% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 15min, 1250 ℃ of sintering temperatures, under the condition of roasting time 15min, pre-hot-bulb compression strength can reach 455N/, and intensity of roasting can reach 2490N/.
Embodiment 7, and Brazilian OK a karaoke club adds this red iron ore concentrate, and its main chemical compositions is: TFe 66.54%, FeO 0.8%, SiO
21.21%, Al
2O
31.51%, CaO 0.028%, MgO 0.045%.Certain brown iron ore concentrate, its main chemical compositions is: TFe 56.55%, SiO
29.53%, Al
2O
31.69%, CaO 0.6%, MgO 0.03%.Compare in the ore deposit of joining of above-mentioned two kinds of concentrate: Brazilian OK a karaoke club adds this red iron ore concentrate 70%, certain brown iron ore concentrate 30%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 21min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 418N/, and roasting ball ultimate compression strength only reaches 1980N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 60%, CaO accounts for 20%, B
2O
3Account for 20% additive be finely ground to granularity less than below the 0.074mm, 1% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 10min, 1270 ℃ of sintering temperatures, under the condition of roasting time 13min, pre-hot-bulb compression strength can reach 433N/, and intensity of roasting can reach 2320N/.
Embodiment 8, and Brazilian OK a karaoke club adds this red iron ore concentrate, and its main chemical compositions is: TFe 66.54%, FeO 0.8%, SiO
21.21%, Al
2O
31.51%, CaO 0.028%, MgO 0.045%.Certain brown iron ore concentrate, its main chemical compositions is: TFe 56.55%, SiO
29.53%, Al
2O
31.69%, CaO 0.6%, MgO 0.03%.Compare in the ore deposit of joining of above-mentioned two kinds of concentrate: Brazilian OK a karaoke club adds this red iron ore concentrate 50%, certain brown iron ore concentrate 50%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 21min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 418N/, and roasting ball ultimate compression strength only reaches 1980N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 60%, CaO accounts for 20%, B
2O
3Account for 20% additive be finely ground to granularity less than below the 0.074mm, 3% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 10min, 1260 ℃ of sintering temperatures, under the condition of roasting time 13min, pre-hot-bulb compression strength can reach 451N/, and intensity of roasting can reach 2460N/.
Embodiment 9, certain red iron ore concentrate, and its main chemical compositions is: TFe 66.54%, FeO 0.8%, SiO
21.21%, Al
2O
31.51%, CaO 0.028%, MgO 0.045%.Certain brown iron ore concentrate, its main chemical compositions is: TFe 56.55%, SiO
29.53%, Al
2O
31.69%, CaO 0.6%, MgO 0.03%.Compare in the ore deposit of joining of above-mentioned two kinds of concentrate: certain red iron ore concentrate 30%, certain brown iron ore concentrate 70%.Wilkinite with addition of 1.5% is made ball behind mixing, the gained green-ball carries out preheating and baking after drying, 1000 ℃ of preheating temperatures, warm up time 21min, 1310 ℃ of maturing temperatures, under the condition of roasting time 21min, pre-hot-bulb ultimate compression strength is 418N/, and roasting ball ultimate compression strength only reaches 1980N/.Under the constant prerequisite of bentonite ore ratio, will consist of by mass percentage Fe
3O
4Account for 60%, CaO accounts for 20%, B
2O
3Account for 20% additive and be finely ground to granularity less than below the 0.074mm, 5% ratio is allocated in the compound by mass percentage then, behind mixing, make ball, the gained green-ball carries out preheating and baking after drying, 900 ℃ of preheat temperatures, preheating time 10min, 1250 ℃ of sintering temperatures, under the condition of roasting time 13min, pre-hot-bulb compression strength can reach 465N/, and intensity of roasting can reach 2330N/.
Claims (2)
1, a kind of additive for hard-to-calcine iron ore pellt production is characterized in that: by B
2O
3, CaO and Fe
3O
4Form, wherein Fe
3O
4Mass percent accounts for 60%～80%, the CaO mass percent accounts for 5%～20%, B
2O
3Mass percent accounts for 5%～20%, is finely ground to granularity during use less than 0.074mm.
2, the additive of producing for hard-to-calcine iron ore pellt according to claim 1 is characterized in that: to add mass percent in hard-to-calcine iron ore pellt be 1%～5% to this additive during use, when proportioning is got low value, and CaO, B in this additive
2O
3The mass percent capping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100348397A CN100497671C (en) | 2007-04-28 | 2007-04-28 | Additive for producing hard-to-calcine iron ore pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100348397A CN100497671C (en) | 2007-04-28 | 2007-04-28 | Additive for producing hard-to-calcine iron ore pellet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101045956A true CN101045956A (en) | 2007-10-03 |
| CN100497671C CN100497671C (en) | 2009-06-10 |
Family
ID=38770878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100348397A Expired - Fee Related CN100497671C (en) | 2007-04-28 | 2007-04-28 | Additive for producing hard-to-calcine iron ore pellet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100497671C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643843B (en) * | 2009-09-02 | 2011-04-27 | 中南大学 | Composite additive for reinforcing calcination of hematite pellets |
| CN101643841B (en) * | 2009-08-21 | 2011-07-20 | 武汉钢铁(集团)公司 | Additive for improving metallurgical performance of all Fe2O3 pellets and use method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1740462A1 (en) * | 1989-06-06 | 1992-06-15 | Химико-металлургический институт АН КазССР | Agglomerate production method |
| CN1212291A (en) * | 1998-08-14 | 1999-03-31 | 王琳 | Sintering fortifying catalytic additive |
-
2007
- 2007-04-28 CN CNB2007100348397A patent/CN100497671C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643841B (en) * | 2009-08-21 | 2011-07-20 | 武汉钢铁(集团)公司 | Additive for improving metallurgical performance of all Fe2O3 pellets and use method thereof |
| CN101643843B (en) * | 2009-09-02 | 2011-04-27 | 中南大学 | Composite additive for reinforcing calcination of hematite pellets |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100497671C (en) | 2009-06-10 |
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