CN101550484A - Acidic magnesia pellet and preparation method thereof - Google Patents
Acidic magnesia pellet and preparation method thereof Download PDFInfo
- Publication number
- CN101550484A CN101550484A CNA2008100108415A CN200810010841A CN101550484A CN 101550484 A CN101550484 A CN 101550484A CN A2008100108415 A CNA2008100108415 A CN A2008100108415A CN 200810010841 A CN200810010841 A CN 200810010841A CN 101550484 A CN101550484 A CN 101550484A
- Authority
- CN
- China
- Prior art keywords
- pellet
- acidic
- temperature
- magnesia
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to an acidic magnesia pellet and a preparation method thereof. 90-95 percent of magnetite powder, 1-2 percent of bentonite and 4-8 percent of magnesite powder with grain size of 200 meshes are blended with magnesite powder and bentonite in a batching room for dry mixing, and in the controlled pellet raw material, MgO/SiO2 is equal to 0.4-0.55; and meanwhile, the roasting temperature is kept between 1250 DEG C and 1300 DEG C, thus the acidic magnesia pellet can be produced. The low-temperature reduction degradation index of the pellet is improved under the conditions without increasing the equipment investment and changing the original process, and the low-temperature reduction expansion rate is reduced by 50 percent; the softening temperature of the pellet is raised by 120-150 DEG C, the high-temperature metallurgical property of the pellet is enhanced and the smelting conditions of the blast furnace are improved; and the invention is adequate in raw materials, simple in production process and convenient for operation and grasping and has the superiority and the value for the increase of the use proportion of the pellet and the broad popularization.
Description
Technical field
The invention belongs to iron-smelting raw material pellet agglomeration technology field, specifically relate to a kind of magnet fine mineral powder is produced acidic magnesia pellet and preparation thereof with addition of the magnesite powder method.
Background technology
The materials structure of blast furnace is that can ironmaking produce important prerequisite and the basic substance that realize high-quality, low consumption, high yield, thereby one to being paid close attention to by people and paying attention to, and in the blast furnace raw material production technique, drop into a large amount of fund and energy, taked a lot of advanced persons' technique means to be grouped into the one-tenth that changes pellet, and then improve the metallurgical performance of raw material, for the target that realizes high-quality, low consumption, high yield is done a lot of work, and obtained certain effect.
At present, the output of domestic pellet increases sharply, and rate of utilization also improves constantly.No wonder and two kinds of pelletizing kind acid pellet and alkaline pelletizings also have the situation that the two collocation is used.But common acidic pellet ore exists reduction swellability rate height, and is softening, and molten low temperature is low, and the loading softening problem of problem, especially pellets such as high temperature metallurgical properties difference is more outstanding.Because the softening initial stage temperature of common acidic pellet ore is low, cause the interior cohesive zone of blast furnace to thicken, reduce the ventilation property of blast furnace, thereby influenced the working of a furnace and the output of blast furnace.
For this reason, Chinese patent application numbers 2006100182999 provides " a kind of iron ore pellets and preparation method thereof ", be to add the forsterite of 2～4wt% and the binding agent of 0.2～0.8wt% in iron ore, add the water mixing, the moisture content in the compound behind the mixing is 6～11wt%; Reproducing ball, drying, is preheating under 900 ℃～1000 ℃ conditions in temperature then, and be 15～25min warm up time; Be roasting 20～40min under 1260 ℃～1320 ℃ conditions in temperature at last.This method can obviously be improved the every performance index and the working of a furnace of pellet under the condition that does not increase facility investment.But its defective is: the one, and the binding agent that needs special preparation to form by sodium starch glycolate, polyacrylamide, sodium humate, water-proof putty powder, kaolin, ferrous sulfate and yellow soda ash; The 2nd, raw material need add water and mix, and is difficult to mix; The 3rd, preparation section is more, the technology slightly complicated
Summary of the invention
Purpose of the present invention is exactly the problem at above-mentioned existence, it is reasonable, simple for process to aim to provide a kind of composition collocation, can obviously improve the high temperature metallurgical properties of blast furnace materials, improve the capacity factor of a blast furnace, reduce acidic magnesia pellet of fuel consumption and production cost and preparation method thereof.
For achieving the above object, the technical solution that the present invention taked is:
Acidic magnesia pellet of the present invention, its raw material are formed weight percent content and are:
Magnetite powder 90～95%, wilkinite 1～2%, magnesite powder 4～8%.
Described magnetite powder chemical ingredients is: TFe 66～69wt%, FeO 16.2～28.5wt%, SiO
24.1～6.3wt%, CaO 0.10～0.22wt%, MgO 0.14～0.34wt%; Bentonitic chemical ingredients is: TFe 1.15～1.20wt%, FeO 0.15～0.20wt%, SiO
268～71wt%, CaO 1.45～1.55wt%, MgO 1.45～1.55wt%.
Described magnesite powder comprises the magnesite stone flour and the light-burning magnesium powder of particle diameter-200 order＞90%, and its chemical ingredients is: TFe 0.58～0.68wt%, FeO 0.30～0.42wt%, SiO
21.48～1.56wt%, CaO 1.60～1.75wt%, MgO 41～47wt%.
The preparation method of acidic magnesia pellet of the present invention is to do with addition of magnesite powder and wilkinite in proportioning room to mix MgO/SiO in the control pellet raw material
2=0.4～0.55; Maturing temperature remains between 1250 ℃～1300 ℃.All the other are common process.
Adopt the present invention, not increasing any facility investment and not changing substantially under the condition of original technology, improved pellet low temperature reduction degradation index index, the low-temperature reduction rate of expansion reduces by 50%; Make the soft temperature of melting of pellet improve 120 ℃～150 ℃, variation reduces between the softened zone, helps improving the high temperature metallurgical properties of pellet, improves the blast-furnace smelting condition, improves the utilization coefficient of blast furnace.Sufficient raw of the present invention is prepared burden easily simultaneously, and production technique is simple, is convenient to operation and grasp, has its usage ratio of raising, condition of generally promoting and value.
Embodiment
The invention will be further described below in conjunction with embodiment.
Table 1 embodiment raw material composition, active chemical and proportioning table look-up
After 1,2, the 3 listed raw materials of embodiment in the last table are ready to, in proportioning room according to each self-corresponding ratio with addition of magnesite powder and wilkinite, and do and mix.Want MgO/SiO in the strict control pellet raw material
2Ratio between 0.4～0.55.Maturing temperature during sintering can not be low excessively, generally should remain between 1250 ℃～1300 ℃.All the other adopt common process can produce the present invention's acidic magnesia pellet.
The acidic magnesia pellet of producing according to above-mentioned raw materials component, chemical ingredients, proportioning and method has reached the needs of blast-furnace smelting fully, has realized purpose of the present invention.Select for use granularity be 10～12.5mm acidic magnesia pellet as sample, through checking its every performance index as shown in table 2:
The every performance index assay of table 2 acidic magnesia pellet
In the table: RDI
6.3, RDI
3.15, RDI
-0.5Sample after the expression check low temperature reduction degradation index of sieving and being drawn respectively with the square hole sieve of 6.3mm, 3.15mm and 0.5mm;
T
10: the softening beginning of expression temperature, promptly the bed of material shrinks 10% o'clock temperature;
T
40: the softening finishing temperature of expression, promptly the bed of material shrinks 40% o'clock temperature;
△ Tl: expression softening temperature interval, △ Tl=T
40-T
10
Tm: expression drippage beginning temperature, i.e. first temperature when dripping.
Be not difficult to find out by the listed test rating of last table, maturing temperature greater than 1250 ℃ condition under, acidic magnesia pellet ultimate compression strength can satisfy the requirement of blast-furnace smelting fully, and the maturing temperature of common stoving oven design all can reach this requirement.Under the identical prerequisite of other smelting conditions, add MgO and help improving the high temperature metallurgical properties of pellet, its soft soft temperature of melting of melting temperature near high basicity sinter, make blast furnace the soft temperature range of melting of stock column narrow down, improve ventilation property, the direct motion that helps smelting.Acidic magnesia pellet makes moderate progress the low temperature reduction degradation index index, and the reduction swellability index obviously improves.Therefore, acidic magnesia pellet has more significant high temperature metallurgical properties advantage than common acidic pellet ore.
Claims (4)
1, a kind of acidic magnesia pellet is characterized in that, raw material is formed weight percent content and is:
Magnetite powder 90～95%, wilkinite 1～2%, magnesite powder 4～8%.
2, acidic magnesia pellet according to claim 1 is characterized in that, described magnetite powder chemical ingredients is: TFe 66～69wt%, FeO 16.2～28.5wt%, SiO
24.1～6.3wt%, CaO0.10～0.22wt%, MgO 0.14～0.34wt%; Bentonitic chemical ingredients is: TFe 1.15～1.20wt%, FeO 0.15～0.20wt%, SiO
268～71wt%, CaO 1.45～1.55wt%, MgO 1.45～1.55wt%.
3, acidic magnesia pellet according to claim 1 is characterized in that, described magnesite powder comprises the magnesite stone flour and the light-burning magnesium powder of particle diameter-200 order＞90%, and its chemical ingredients is: TFe 0.58～0.68wt%, FeO 0.30～0.42wt%, SiO
21.48～1.56wt%, CaO 1.60～1.75wt%, MgO 41～47wt%.
4, a kind of preparation method of acidic magnesia pellet is characterized in that, does with addition of magnesite powder and wilkinite in proportioning room and mixes MgO/SiO in the control pellet raw material
2=0.4～0.55; Maturing temperature remains between 1250 ℃～1300 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100108415A CN101550484A (en) | 2008-03-31 | 2008-03-31 | Acidic magnesia pellet and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100108415A CN101550484A (en) | 2008-03-31 | 2008-03-31 | Acidic magnesia pellet and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101550484A true CN101550484A (en) | 2009-10-07 |
Family
ID=41154972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100108415A Pending CN101550484A (en) | 2008-03-31 | 2008-03-31 | Acidic magnesia pellet and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101550484A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102399978A (en) * | 2011-11-09 | 2012-04-04 | 山西太钢不锈钢股份有限公司 | Manufacture method of iron ore MgO pellet ore |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
| CN102719662A (en) * | 2011-03-30 | 2012-10-10 | 鞍钢股份有限公司 | Magnesium binder used for pellet and preparation method and addition method thereof |
| CN105063347A (en) * | 2015-08-26 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Method for producing pellets with discarded calcium magnesium bricks |
| CN106978533A (en) * | 2017-03-01 | 2017-07-25 | 江苏省冶金设计院有限公司 | Prepare the method and system of gas-based shaft kiln acid pellet |
| CN112159896A (en) * | 2020-09-27 | 2021-01-01 | 酒泉钢铁(集团)有限责任公司 | High-magnesium internal combustion acid pellet ore |
-
2008
- 2008-03-31 CN CNA2008100108415A patent/CN101550484A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
| CN102719662A (en) * | 2011-03-30 | 2012-10-10 | 鞍钢股份有限公司 | Magnesium binder used for pellet and preparation method and addition method thereof |
| CN102399978A (en) * | 2011-11-09 | 2012-04-04 | 山西太钢不锈钢股份有限公司 | Manufacture method of iron ore MgO pellet ore |
| CN105063347A (en) * | 2015-08-26 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Method for producing pellets with discarded calcium magnesium bricks |
| CN105063347B (en) * | 2015-08-26 | 2017-04-26 | 山西太钢不锈钢股份有限公司 | Method for producing pellets with discarded calcium magnesium bricks |
| CN106978533A (en) * | 2017-03-01 | 2017-07-25 | 江苏省冶金设计院有限公司 | Prepare the method and system of gas-based shaft kiln acid pellet |
| CN112159896A (en) * | 2020-09-27 | 2021-01-01 | 酒泉钢铁(集团)有限责任公司 | High-magnesium internal combustion acid pellet ore |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100348744C (en) | Iron ore pellet and its preparation method | |
| CN101649392B (en) | Pelletizing method of ilmenite concentrates and pellet binder | |
| CN104073627A (en) | Producing method of fluxed composite pellet | |
| CN101550484A (en) | Acidic magnesia pellet and preparation method thereof | |
| CN101985689A (en) | Composite binder for iron ore pellets and preparation method thereof | |
| CN102399978B (en) | Manufacture method of iron ore MgO pellet ore | |
| CN101906533B (en) | Low-silicon magnesium-containing pellets and production method thereof | |
| CN101736148A (en) | Sintering-pelletizing additive, preparation method and application thereof | |
| CN104357657A (en) | Method for preparing oxidized pellets from converter dedusting ash | |
| CN105087842B (en) | A kind of method of high-iron bauxite production molten iron and aluminum oxide | |
| WO2023130784A1 (en) | Additive for reducing roasting temperature of fluxed magnetite pellets and use method | |
| CN102021318A (en) | Magnesian self-fluxed pellet and preparation method thereof | |
| CN102409170A (en) | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets | |
| CN102925671A (en) | Sintering method of iron ore with added limonite | |
| CN103627895A (en) | Production method for sintering chromium powder ore by continuous strand sinter machine | |
| CN107345272A (en) | A kind of pellet binder and its preparation and application containing magnesia | |
| CN102851491A (en) | Red mud composite binder for oxidized pellets | |
| CN107130070A (en) | A kind of calcium-magnesium-containing pellet and preparation method thereof | |
| CN104496230B (en) | Clinker and preparation method thereof | |
| CN103614551B (en) | Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof | |
| CN110205485A (en) | One kind containing K2O、Na2O, the oxide pellet and preparation method thereof of F iron ore | |
| CN205774134U (en) | A kind of production line utilizing magnesite concentrate one one-step baking highly-purity magnesite | |
| CN104988309B (en) | Iron ore pellets boron magnesium compound binding agent and purposes and the processing method of acidic pellet ore | |
| CN110894572B (en) | Additive for reducing roasting temperature of high-silicon magnetite concentrate pellets and application method thereof | |
| CN102517444B (en) | Liquid state binder capable of reinforcing iron ore sintering, its preparation and its application method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20091007 |