CN103305687A - Method for suppressing reduction swelling rate of pellet - Google Patents
Method for suppressing reduction swelling rate of pellet Download PDFInfo
- Publication number
- CN103305687A CN103305687A CN2013102362680A CN201310236268A CN103305687A CN 103305687 A CN103305687 A CN 103305687A CN 2013102362680 A CN2013102362680 A CN 2013102362680A CN 201310236268 A CN201310236268 A CN 201310236268A CN 103305687 A CN103305687 A CN 103305687A
- Authority
- CN
- China
- Prior art keywords
- pellet
- iron ore
- self
- ore concentrate
- proportioning
- 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 a method for suppressing the reduction swelling rate of a pellet, which is characterized in that the raw materials for preparing a pellet include an iron-containing material and bentonite, wherein the iron-containing material comprises a steel-clad self-produced iron ore concentrate and an outsourced domestic common iron ore concentrate; the bentonite accounts for 2.5-6% of the mixture by weight; and the proportion is adjusted according to the proportion of the steel-clad self-produced iron ore concentrate in the iron-containing material in a pellet production process. The method provided by the invention has the advantages that the reduction swelling rate of pellets with different dosages of self-produced iron ore concentrates can be suppressed by adjusting different proportions of bentonite, and the pellet quality under a condition of high proportion of self-produced iron ore concentrate is effectively improved so as to improve the technical-economical index of a blast furnace.
Description
Technical field
The present invention relates to a kind of method that suppresses the pellet ore reduction swellability rate, particularly a kind ofly be fit to contain potassium, the sodium iron ore concentrate carries out the method that Pelletizing Process suppresses the reduction swellability rate, belongs to steel industry pelletizing process production field.
Background technology
Expansion along with Baogang's pig iron throughput, the throughput of pelletizing is also enlarging, cause existing ferric charge can not satisfy the demand of the pellet formation after enhancing production capacities, and pelletizing in short supply at Iron Ore Market reduces under the constraint of cost simultaneously, can only be with addition of the self-produced Bayan Obo iron ore concentrate of part Baogang.Baiyuneboite is the large-scale complex deposit of the multiple element symbiosis such as rare in the world iron, rare earth, niobium, fluorite (fluorine), its iron ore concentrate is owing to containing fluorine, potassium, sodium, in pelletizing process, cause the reduction swellability rate of pellet to raise with addition of the too high meeting of ratio, thereby affect blast furnace production, worsen the blast furnace index.Especially Baogang's ore slurry pipeline of newly going into operation is in recent years carried ultra-fine iron ore concentrate (0.074 μ m accounts for more than 90%), preferably for pelletizing process from granularity, but find that in the middle of using the too high meeting of its consumption causes the reduction swellability rate of pellet to raise, how at pelletizing process this self-produced ultra-fine iron ore concentrate rationally to be utilized better is the aim of present technique inventive method.In general, the pellet ore reduction swellability rate is 20% take interior as normal expansion, and 20% ~ 40% is undesirable extention, and surpassing 40% be calamitous expansion, that is to say that the rate of expansion index that satisfies the blast furnace feeding pellet should be lower than 20%.
Summary of the invention
The purpose of this invention is to provide a kind of under the condition that does not change pellet basicity, add the reduction swellability rate that bentonitic consumption suppresses pellet by improving, thereby improve fluorine-containing pellet quality index, be conducive to improve a kind of method that suppresses the pellet ore reduction swellability rate of blast furnace index.
The method of the fluorine-containing pellet ore reduction swellability rate of inhibition of the present invention is as follows:
Used for pellet raw material of the present invention has ferric charge and wilkinite.Ferric charge comprises the self-produced iron ore concentrate of Baogang and the domestic common iron ore concentrate of outsourcing, bentonitic proportioning is controlled at the 2.5 ~ 6wt% that accounts for compound, this proportioning according to the self-produced iron ore concentrate of Baogang in the middle of the pellet production process in ferric charge shared proportioning how much come to be adjusted: (1) is the domestic common iron ore concentrate of outsourcing if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 40 all the other ferric charges of wt %(, as follows), bentonite ore ratio is controlled to be 2.5 ~ 3 wt %; (2) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 40 ~ 50 wt %, bentonite ore ratio is controlled to be 3.0 ~ 3.5 wt %; (3) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 60 ~ 70 wt %, bentonite ore ratio is controlled to be 4.0 wt %; (4) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 70 ~ 80 wt %, bentonite ore ratio is controlled to be 4.0 ~ 4.5 wt %; (5) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 80 ~ 90 wt %, bentonite ore ratio is controlled to be 4.5 ~ 5.0 wt %; (6) if Baogang's self-produced iron ore concentrate proportioning in iron charge accounts for 100 wt %, bentonite ore ratio is controlled to be 5.0 ~ 6.0 wt %.
Described pellet is acidic pellet ore.
Granularity-200 order grade accounts for more than the 85 wt % in the self-produced iron ore concentrate of described Baogang.
Above-mentioned ferric charge and wilkinite are prepared burden by weighing balance in proportioning room in proportion according to Production requirement, be transported to afterwards and carry out mixing in the intensive mixer, compound behind the mixing enters balling disk (-sc) and carries out pelletizing, the green-ball that to make afterwards is through roll screen, with the green-ball cloth of 8mm ~ 16mm to belt type roasting machine, drying, preheating, roasting, soaking, cooling double teacher, this sinter process process parameter control need not to adjust.
Advantage of the present invention is: is suppressed under the different fluorine-containing iron ore conditions of mixture ratios by different bentonite ore ratios, and the reduction swellability rate of pellet, thus improve the blast furnace feeding pellet quality, improve the blast-furnace technique economic target.
Embodiment
Embodiment 1
Adopt the iron charge configuration of the self-produced iron ore concentrate of 40 wt % Baogangs+domestic common iron ore concentrate of 60 wt % outsourcings, before the enforcement, what binding agent adopted is compound binding agent, proportioning 1.0 wt%, green-ball fall ball 3.5 times/, and compression strength of green pellet is 12.91N/ ball, dry bulb ultimate compression strength is 26.5 a N/ ball, a pelletizing crushing strength 1980N/ ball under 1250 ℃ of maturing temperatures, the rate of expansion of pellet is 26.7%, reaches undesirable extention; After the enforcement, under identical iron charge configuration, binding agent changes wilkinite into, and proportioning is controlled at 2.5 ~ 3.0 wt %, and green-ball falls and is increased to ball 5.4 ~ 6.9 times/, the green-ball pressure resistance reaches 15.5 ~ 18.1N/ ball, dry bulb ultimate compression strength reaches 79.72 ~ 91.99 a N/ ball, and pelletizing crushing strength reaches 2025 ~ 2300N under the identical maturing temperature, and the rate of expansion of finished ball is reduced to 18.8 ~ 9.5% simultaneously, belong to the normal expansion scope, the grade of pellet reduces by 0.9 ~ 1.3 percentage point.
Embodiment 2
Before the enforcement, adopt the iron charge configuration of the self-produced iron ore concentrate of 40 wt % Baogangs+domestic common iron ore concentrate of 60 wt % outsourcings, what binding agent adopted is compound binding agent, proportioning 1.0 wt%, green-ball fall ball 3.5 times/, and compression strength of green pellet is 12.91N/ ball, dry bulb ultimate compression strength is 26.5 a N/ ball, a pelletizing crushing strength 1980N/ ball under 1250 ℃ of maturing temperatures, the rate of expansion of pellet is 26.7%, reaches undesirable extention; After the enforcement, adopt the iron charge configuration of the self-produced iron ore concentrate of 50 wt % Baogangs+domestic common iron ore concentrate of 50 wt % outsourcings, binding agent changes wilkinite into, proportioning is controlled at 2.5 ~ 4.0 wt %, green-ball falls and is increased to ball 4.3 ~ 5.35 times/, the green-ball pressure resistance reaches 13.5 ~ 17.1N/ ball, dry bulb ultimate compression strength reaches 63.76 ~ 91.89 a N/ ball, pelletizing crushing strength reaches 2640 ~ 3020N under the identical maturing temperature, the rate of expansion of finished ball is reduced to 20.6 ~ 12.7% simultaneously, belong to the normal expansion scope, the grade of pellet reduces by 0.1 ~ 1.1 percentage point.
Embodiment 3
Before the enforcement, adopt the iron charge configuration of the self-produced iron ore concentrate of 40 wt % Baogangs+domestic common iron ore concentrate of 60 wt % outsourcings, what binding agent adopted is compound binding agent, proportioning 1.0 wt%, green-ball fall ball 3.5 times/, and compression strength of green pellet is 12.91N/ ball, dry bulb ultimate compression strength is 26.5 a N/ ball, a pelletizing crushing strength 1980N/ ball under 1250 ℃ of maturing temperatures, the rate of expansion of pellet is 26.7%, reaches undesirable extention; After the enforcement, adopt the iron charge configuration of the self-produced iron ore concentrate of 60 wt % Baogangs+domestic common iron ore concentrate of 40 wt % outsourcings, binding agent changes wilkinite into, proportioning is controlled at 3.5 ~ 4.0 wt %, green-ball falls and is increased to ball 4.4 ~ 6.9 times/, the green-ball pressure resistance reaches 12.3 ~ 13.95N/ ball, dry bulb ultimate compression strength reaches 84.46 ~ 105.51 a N/ ball, pelletizing crushing strength reaches 2460 ~ 2700N under the identical maturing temperature, the rate of expansion of finished ball is reduced to 22.5 ~ 15.2% simultaneously, belong to the normal expansion scope, the grade of pellet reduces by 0.3 ~ 0.8 percentage point.
Embodiment 4
Before the enforcement, adopt the iron charge configuration of the self-produced iron ore concentrate of 40 wt % Baogangs+domestic common iron ore concentrate of 60 wt % outsourcings, what binding agent adopted is compound binding agent, proportioning 1.0 wt%, green-ball fall ball 3.5 times/, and compression strength of green pellet is 12.91N/ ball, dry bulb ultimate compression strength is 26.5 a N/ ball, a pelletizing crushing strength 1980N/ ball under 1250 ℃ of maturing temperatures, the rate of expansion of pellet is 26.7%, reaches undesirable extention; After the enforcement, adopt the iron charge configuration of the self-produced iron ore concentrate of 100 wt % Baogangs, binding agent is wilkinite, proportioning is increased to 6.0 wt %, it is 16.6 times/balls that green-ball falls, compression strength of green pellet is 14.17N/ ball, dry bulb ultimate compression strength reaches 148.4 a N/ ball, pelletizing crushing strength reaches 2060N under the identical maturing temperature, the rate of expansion of finished ball can be reduced to 19.4%, belong to the normal expansion scope, the grade of pellet reduces by 1.3 percentage points, and the production cost of pellet obtains decrease simultaneously.
Claims (3)
1. method that suppresses the pellet ore reduction swellability rate, it is characterized in that: the raw material of pellet is ferric charge and wilkinite, ferric charge comprises the self-produced iron ore concentrate of Baogang and the domestic common iron ore concentrate of outsourcing, bentonitic proportioning is controlled at the 2.5 ~ 6wt% that accounts for compound, this proportioning according to the self-produced iron ore concentrate of Baogang in the middle of the pellet production process in ferric charge shared proportioning how much come to be adjusted: (1) is if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 40 wt %, all the other ferric charges are the domestic common iron ore concentrate of outsourcing, as follows, bentonite ore ratio is controlled to be 2.5 ~ 3 wt %; (2) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 40 ~ 50 wt %, bentonite ore ratio is controlled to be 3.0 ~ 3.5 wt %; (3) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 60 ~ 70 wt %, bentonite ore ratio is controlled to be 4.0 wt %; (4) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 70 ~ 80 wt %, bentonite ore ratio is controlled to be 4.0 ~ 4.5 wt %; (5) if Baogang's self-produced iron ore concentrate proportioning in ferric charge accounts for 80 ~ 90 wt %, bentonite ore ratio is controlled to be 4.5 ~ 5.0 wt %; (6) if Baogang's self-produced iron ore concentrate proportioning in iron charge accounts for 100 wt %, bentonite ore ratio is controlled to be 5.0 ~ 6.0 wt %.
2. the method for inhibition pellet ore reduction swellability rate according to claim 1, it is characterized in that: described pellet is acidic pellet ore.
3. the method for inhibition pellet ore reduction swellability rate according to claim 1, it is characterized in that: granularity-200 order grade accounts for more than the 85 wt % in the self-produced iron ore concentrate of described Baogang.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102362680A CN103305687A (en) | 2013-06-14 | 2013-06-14 | Method for suppressing reduction swelling rate of pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102362680A CN103305687A (en) | 2013-06-14 | 2013-06-14 | Method for suppressing reduction swelling rate of pellet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103305687A true CN103305687A (en) | 2013-09-18 |
Family
ID=49131401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102362680A Pending CN103305687A (en) | 2013-06-14 | 2013-06-14 | Method for suppressing reduction swelling rate of pellet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103305687A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232886A (en) * | 2014-09-19 | 2014-12-24 | 内蒙古包钢钢联股份有限公司 | Raw materials for production of oxidized pellets with low reduction expansion rate and preparation method of oxidized pellets |
| CN106636503A (en) * | 2016-11-10 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Blast furnace burden |
| CN109266840A (en) * | 2018-12-06 | 2019-01-25 | 福建龙净脱硫脱硝工程有限公司 | A kind of pellet and its production method |
| CN109487074A (en) * | 2018-11-13 | 2019-03-19 | 包头钢铁（集团）有限责任公司 | A kind of fluxed pellets mine and preparation method thereof with addition of the production of fluorine-containing magnetite concentrate |
| CN113817918A (en) * | 2021-08-05 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Method for improving reduction expansion of high-alkali metal and high-F content pellet ore |
| CN114058841A (en) * | 2021-11-16 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for controlling chemical components of alkali-containing metal pellet ore by controlling reduction expansion rate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713024A (en) * | 2009-10-30 | 2010-05-26 | 内蒙古包钢钢联股份有限公司 | Fluorine-containing magnesium oxide pellet ore |
-
2013
- 2013-06-14 CN CN2013102362680A patent/CN103305687A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713024A (en) * | 2009-10-30 | 2010-05-26 | 内蒙古包钢钢联股份有限公司 | Fluorine-containing magnesium oxide pellet ore |
Non-Patent Citations (1)
| Title |
|---|
| 邹虎林等: ""抑制包钢球团矿膨胀率的技术研究"", 《2012年全国炼铁生产技术会议暨炼铁学术年会文集上》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232886A (en) * | 2014-09-19 | 2014-12-24 | 内蒙古包钢钢联股份有限公司 | Raw materials for production of oxidized pellets with low reduction expansion rate and preparation method of oxidized pellets |
| CN106636503A (en) * | 2016-11-10 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Blast furnace burden |
| CN109487074A (en) * | 2018-11-13 | 2019-03-19 | 包头钢铁（集团）有限责任公司 | A kind of fluxed pellets mine and preparation method thereof with addition of the production of fluorine-containing magnetite concentrate |
| CN109266840A (en) * | 2018-12-06 | 2019-01-25 | 福建龙净脱硫脱硝工程有限公司 | A kind of pellet and its production method |
| CN113817918A (en) * | 2021-08-05 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Method for improving reduction expansion of high-alkali metal and high-F content pellet ore |
| CN113817918B (en) * | 2021-08-05 | 2023-03-21 | 包头钢铁（集团）有限责任公司 | Method for improving reduction expansion of high-alkali metal and high-F content pellet ore |
| CN114058841A (en) * | 2021-11-16 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for controlling chemical components of alkali-containing metal pellet ore by controlling reduction expansion rate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103305687A (en) | Method for suppressing reduction swelling rate of pellet | |
| CN102321849B (en) | Preparation method of nickel-chrome alloy steel | |
| CN104357657B (en) | A kind of method utilizing converter dust-removing ash to prepare acid pellet | |
| CN101215632A (en) | Bonding agent for iron ore pellet and preparation method thereof | |
| CN101713024A (en) | Fluorine-containing magnesium oxide pellet ore | |
| CN104232886A (en) | Raw materials for production of oxidized pellets with low reduction expansion rate and preparation method of oxidized pellets | |
| CN104073627A (en) | Producing method of fluxed composite pellet | |
| CN103060548B (en) | Method for sintering chromite powder recycled based on ferronickel smelting furnace slag | |
| CN104531983B (en) | Method used for preparing pellet ore from fluorine-containing mixed iron concentrate | |
| CN104561534A (en) | Magnesium containing fluxed oxide pellets and preparation method thereof | |
| CN105063348A (en) | Fluxed MgO pellet ore production method | |
| CN108998606B (en) | The blast furnace ferrous burden structure that a kind of pellet and Metallurgical Properties of Sinter are distributed rationally | |
| CN102787234A (en) | High-ratio sintering method for limonite | |
| CN106435170B (en) | A kind of Basic Pellets preparation method and preparation and mineral powder mixed material used | |
| CN109355494B (en) | Pellet containing chromium-containing vanadium-titanium magnetite and capable of improving chalking resistance and preparation method of pellet | |
| CN103343221B (en) | Method for using fly ash as molten iron smelting material | |
| CN103146914B (en) | Cold-pressed high-strength fluorite pellet binder and use method thereof | |
| CN107345272A (en) | A kind of pellet binder and its preparation and application containing magnesia | |
| CN104711418A (en) | Method for using metallurgical iron-bearing dust in iron-making | |
| CN106191434A (en) | The manufacture method of a kind of iron smelting pellets is mining magnesio organic binder bond | |
| CN102268533B (en) | Move horizontally-fixed-bed type Magnetization reductive roasting technique | |
| CN103468935B (en) | A kind of sinter production method containing high crystal water lump ore | |
| CN109371232A (en) | For reducing the method for pellet expansion rate | |
| CN103114198A (en) | Method for utilizing nickel flash smelting water-quenched slag | |
| CN107385213A (en) | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
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 |
Application publication date: 20130918 |