CN1664116A - Iron making process in blast furnace and additives therefor - Google Patents
Iron making process in blast furnace and additives therefor Download PDFInfo
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- CN1664116A CN1664116A CN 200510045828 CN200510045828A CN1664116A CN 1664116 A CN1664116 A CN 1664116A CN 200510045828 CN200510045828 CN 200510045828 CN 200510045828 A CN200510045828 A CN 200510045828A CN 1664116 A CN1664116 A CN 1664116A
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- blast furnace
- additive
- mgo
- magnesium oxide
- ironmaking
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a new iron-smelting process of adding magnesium oxide scientifically in blast furnace, and it is characterized in that the magnesium oxide is made to additive which is mixed with raw coal and made to coal powder containing magnesium oxide and is injected into blast furnace 1 from tuyere 4. The invention also provides the magnesium oxide addictive which is used for iron-smelting in the new process. The formulation of the addictive calculated by weight is: MgO 80-83; CaO 12-14; SiO21-2; fire waste 4-6. The main component magnesium oxide can be replaced by magnesium compounds. The invention is modifying the preexisting process of adding magnesium oxide to sintered ore to the new process of adding magnesium oxide into the furnace through tuyere 4 by using coal powder. By applying the process in this invention the air permeability in lump area 2 can be improved; the thickness of reflowing area 3 can be decreased; the combustion efficiency of coal powder can be increased and the flowability and desulfurizing ability can be improved, which is good for the increase of the smelting strength of blast furnace and the yield and quantity of foundry iron.
Description
Technical field
The invention belongs to the technical field of blast furnace ironmaking.Specifically, the invention provides a kind of in the blast furnace ironmaking process science add magnesian novel process and for the additive of this novel process ironmaking usefulness.
Background technology
In blast furnace ironmaking is produced, guarantee to contain in the blast-furnace slag that the magnesium oxide (MgO) of some amount is necessary.MgO can improve the flowability of slag desulfurization capacity, improvement slag, and can reduce the crushing of cohesive zone and the thickness in control blast furnace melting with soft interval, and this helps improving the combustion intensity of blast furnace, increases output.Because the raw material of blast furnace---do not contain MgO in sintering iron ore itself, coal dust and the solubility promoter usually, so prior art is to add rhombspar (CaCO in the agglomerate production process
3MgCO
3) or wagnerite (MgCO
3).Magnesium-containing compound is joined in the agglomerate, also can help to reduce the low temperature Pulverization ratio of agglomerate at first sight; Yet because the add-on of MgO is bigger, it has brought following new problem: (1) reduces the yield rate that agglomerate is produced, and production cost is increased; (2) make the cold strength variation of agglomerate; (3) the cohesive zone temperature range is risen 60～100 ℃, the whole pressure reduction of State of Blast Furnace stock column is risen, this is unfavorable for the strengthening smelting of blast furnace.Although above-mentioned technology is used widely, the contriver thinks that this is not the scientific approach of adding MgO in the blast furnace ironmaking process.
Summary of the invention
Purpose of the present invention will be sought a kind of magnesian ironmaking novel process of scientifically adding exactly in the blast furnace ironmaking process.
Blast furnace ironmaking novel process proposed by the invention is characterized in that making the coal dust that contains MgO together spray into blast furnace from the air port containing magnesian additive and raw coal.
The coal dust that contains the magnesium oxide additive is blown in the blast-furnace tuyere, not only can improve MgO content in the flowability of finishing slag and sweetening power and the finishing slag, can also improve the ventilation property of lump zone, and the thickness of thinning and cohesive zone improves the rate of combustion and the smelting strength of blast furnace of coal dust.Really can obtain and make us unexpected positively effect.
Though the present invention has changed prior art fully magnesium-containing compound is added thinking in the agglomerate, obtain splendid effect, consider that agglomerate is very few because of containing MgO, can adverse influence be arranged its low temperature reduction degradation index.For this reason, the present invention does not contain or contains less under the situation of MgO at agglomerate, adopts to contain CaCl to its surface sprinkling
2The method of the additive of (calcium chloride) is to reduce the low temperature reduction degradation index of agglomerate.Like this, the contriver proposes, and behind the adding MgO additive, sprays into the blast furnace from the air port in coal dust; And in agglomerate, spray CaCl
2Still add blast furnace from the top behind the surface additive, both combine and have formed a complete technical scheme, and Here it is all technical characteristic of the present invention also is the ironmaking novel process of scientifically adding MgO in blast furnace of coming proposed by the invention.
The prescription of the said MgO additive of the present invention (calculating by weight percentage) is:
Composition weight percentage (wt%)
MgO 80～83
CaO 12～14
SiO
2 1～2
Scaling loss 4～6
The add-on of MgO additive can be that standard is determined by the MgO that should contain 8～10wt% in the blast furnace finishing slag in the coal dust, and the winding-up equivalent of MgO additive is 20～30 kilograms of/ton iron usually.
The above-mentioned MgO of containing additive be for novel process of the present invention custom-designed, yet it also can be used as a kind of independently product, sells separately and uses for iron work.
Consider also available magnesium-containing compound of the present invention such as rhombspar (CaCO from the angle that reduces production costs
3MgCO
3), wagnerite (MgCO
3), brucite [Mg (OH)
2] and serpentine [Mg
6(Si
4O
10) (OH)
8] wait ore to replace pure zirconia magnesium in the MgO additive, this moment, additive formulations can remain unchanged, but will increase and decrease its winding-up equivalent according to the effective content of MgO in the additive.So also can obtain good effect.
Proposed by the inventionly come the blast furnace ironmaking novel process, compare, have following remarkable advantage with existing blast furnace smelting process:
(1) MgO and coal dust spray into blast furnace together from the air port, have satisfied the requirement of blast furnace finishing slag to MgO content preferably, not only help improving the flowability of slag and the sweetening power of slag; Reduce the thickness and the crushing of cohesive zone, also can improve the efficiency of combustion of coal dust, help improving combustion intensity, the increase output of blast furnace.
(2) in agglomerate with CaCl
2Surface additive substitutes MgO, not only can reduce the low temperature reduction degradation index of agglomerate, improves the ventilation property of lump zone, can improve the yield rate and the cold strength of agglomerate again.
Description of drawings
Fig. 1 is a technological process synoptic diagram of the present invention;
Among Fig. 1: 1. blast furnace; 2. lump zone; 3. cohesive zone; 4. air port.
Embodiment
The inventor once under the situation for preparing additive in advance, perform technical know-how after, successively in the blast furnace of various scales, implement novel process of the present invention.Now slightly lift numerical example, to explain.
Embodiment 1
At certain 1800M of Iron And Steel Company
3Blast furnace 1 on, the content of the MgO of control in the agglomerate is 0.9wt%, with the CaCl of 4.0wt%
2Additive is sprayed at agglomerate as blast furnace ironmaking raw material by 4.5 kilograms/ton metering.Utilize existing powder process injection system, following prescription contained the MgO additive:
Composition weight percentage (wt%)
MgO 82.3
CaO 12.5
SiO
2 1.4
Scaling loss 3.8
Together add coal pulverizer with raw coal and carry out powder process, and 4 coal dust sprayed into the blast furnace from the air port.The winding-up equivalent of MgO additive is 20 kilograms of/ton iron.Adopt this technology to improve the output of agglomerate effectively, reduced the low temperature reduction degradation index of agglomerate; Improve the ventilation property of blast furnace lump zone 2, reduced stock column pressure reduction 20kPa.This is beneficial to the raising of the capacity factor of a blast furnace and pig iron output significantly.
Embodiment 2
At 1250M
3Blast furnace 1 on implement technology of the present invention.Because magnesian content is 0.8wt% in its agglomerate, so with the CaCl of 4.0wt%
2The aqueous solution evenly is sprayed onto with 5 kilograms/ton usage quantity by agglomerate weight on 200 ℃ the agglomerate surface, and adds in the blast furnace 1.Again following prescription contained the MgO additive:
Composition weight percentage (wt%)
MgO 80
CaO 14
SiO
2 2
Scaling loss 4
Drop into coal pulverizer with raw coal and be milled to powder, 4 spray into the blast furnace from the air port.The winding-up equivalent of additive is 25 kilograms of/ton iron.It is about about 5% that its improves before air port coal combustion rate, and the while is also obviously improved the combustion intensity and the iron quality of blast furnace.
Embodiment 3
At 750M
3Blast furnace 1 on implement this technology.CaCl with 4.0wt%
2The aqueous solution evenly is sprayed onto on (containing MgO 0.8wt%) agglomerate surface below 200 ℃ by the proportioning of 4.2 kilograms/ton of agglomerate weight, adds blast furnace.Again following prescription contained the MgO additive:
Composition weight percentage (wt%)
MgCO
3 80
CaO 14
SiO
2 2
Scaling loss 4
Add coal pulverizer powder process together with raw coal, and 4 coal dust blown into the blast furnace from the air port.The winding-up equivalent of MgO additive is 20 kilograms of/ton iron.The productivity effect of this blast furnace is fine.
Embodiment 4
At 1800M
3Blast furnace 1 on brucite [Mg (OH)
2] replace pure zirconia magnesium (MgO) to implement this technology as additive.Press following formulated MgO additive:
Composition weight percentage (wt%)
Mg(OH)
2 85
CaO 10
SiO
2 1
Scaling loss 4
It is added coal pulverizer powder process with raw coal, and coal dust is sprayed into the blast furnace 1 from air port 4.The winding-up equivalent of MgO additive is 25 kilograms of/ton iron, its sweetening effectiveness and to the optimization function of blast furnace ironmaking process also no less than the pure zirconia magnesium additive.
Embodiment 5
At 1250M
3Blast furnace 1 ironmaking produce in rhombspar (CaCO
3MgCO
3) replace pure zirconia magnesium to implement this technology as additive.Press following formulated MgO additive:
Composition weight percentage (wt%)
CaCO
3·MgCO
3 95
SiO
2 1
Scaling loss 4
It is added coal pulverizer powder process together with raw coal, and coal dust is sprayed into the blast furnace 1 from the air port.Owing to contain CaO, MgO in the rhombspar, when adjusting the prescription of additive, must correspondingly consider the content in the agglomerate, to guarantee the requirement of slag to its composition.
Embodiment 6
With following prescription modulation MgO additive, wherein MgO is by serpentine [Mg
6(Si
4O
10) (OH)
8] replace:
Composition weight percentage (wt%)
Mg
6(Si
4O
10)(OH)
8 83
CaO 12
SiO
2 1
Scaling loss 4
When can selling for blast furnace ironmaking separately, uses this additive.So long as grasp the ABC of iron-making theory or have the practical work experience of blast furnace ironmaking,, all be not difficult to implement novel process of the present invention according to the disclosed content of this specification sheets.
Technical characterictic of the present invention is the novel process of process reform for adding MgO by air port 4 to blast furnace 1 by coal dust of prior art being added MgO by agglomerate in blast furnace, and this is the protection domain that this patent claim is applied for.Novel process of the present invention has been guaranteed the flowability of blast-furnace slag and the sweetening power of slag, improve the ventilation property of lump zone 2, the thickness of thinning and cohesive zone 3, and improved the efficiency of combustion of coal dust, this helps improving the combustion intensity of blast furnace, also helps improving pig iron production and quality.
Claims (7)
1, a kind of in blast furnace science add magnesian ironmaking novel process, it is characterized in that:
(1) will contain magnesian additive and raw coal makes the coal dust that contains MgO together spray into blast furnace from the air port;
(2) sprinkling contains CaCl on agglomerate
2Surface additive to substitute the low temperature reduction degradation index that MgO reduces agglomerate.
2, by the described blast furnace ironmaking novel process of claim 1, it is characterized in that said its prescription of magnesian additive that contains is by weight percentage:
Composition weight percentage (wt%)
MgO 80～83
CaO 12～14
SiO
2 1～2
Scaling loss 4～6.
3, by claim 1,2 described blast furnace ironmaking novel procesies, it is characterized in that the said main component magnesium oxide that contains in the magnesian additive can be magnesium-containing compound.
4, by the described blast furnace ironmaking novel process of claim 3, it is characterized in that said magnesium-containing compound can be rhombspar (CaCO
3MgCO
3) or wagnerite (MgCO
3); Also can be brucite (Mg (OH)
2) or serpentine [Mg
6(Si
4O
10) (OH)
8] wait mineral.
5, a kind ofly contain the magnesium oxide additive, it is characterized in that its prescription is by weight percentage for what blast furnace ironmaking was used:
Composition weight percentage (wt%)
MgO 80～83
CaO 12～14
SiO
2 1～2
Scaling loss 4～6.
6, by the described ironmaking additive of claim 5, it is characterized in that the magnesium oxide in the said prescription can be magnesium-containing compound.
7, by the described ironmaking additive of claim 6, it is characterized in that said magnesium-containing compound can be rhombspar (CaCO
3MgCO
3) or wagnerite (MgCO
3); Also can be brucite (Mg (OH)
2) or serpentine [Mg
6(Si
4O
10) (OH)
8] wait mineral.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510045828 CN1276980C (en) | 2005-02-02 | 2005-02-02 | Iron making process in blast furnace and additives therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510045828 CN1276980C (en) | 2005-02-02 | 2005-02-02 | Iron making process in blast furnace and additives therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1664116A true CN1664116A (en) | 2005-09-07 |
| CN1276980C CN1276980C (en) | 2006-09-27 |
Family
ID=35035426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510045828 Expired - Fee Related CN1276980C (en) | 2005-02-02 | 2005-02-02 | Iron making process in blast furnace and additives therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1276980C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392087A (en) * | 2011-11-23 | 2012-03-28 | 崔涛 | Novel spherical MgO-CaO metallurgy accessory for blast furnace |
| CN104060009A (en) * | 2013-12-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Adding method of desulfurizer in blast furnace ironmaking process and application |
| CN105907951A (en) * | 2016-05-13 | 2016-08-31 | 辽宁科技大学 | Sintering additive and preparation method and application method thereof |
| CN106029911A (en) * | 2014-02-21 | 2016-10-12 | 三菱重工业株式会社 | Method for preparing coal to be injected into blast furnace, coal to be injected into blast furnace, and usage of same |
| CN107955880A (en) * | 2016-10-18 | 2018-04-24 | 上海梅山钢铁股份有限公司 | A kind of additive for improving RDI of Sinter and preparation method thereof |
| CN110687004A (en) * | 2019-09-30 | 2020-01-14 | 鞍钢股份有限公司 | Device and method for testing smelting performance of blast furnace blocky strip iron ore |
| CN112094969A (en) * | 2019-06-18 | 2020-12-18 | 美匡冶金技术研究院(苏州)有限公司 | Sintering method for reducing solid fuel consumption ratio |
| CN115505660A (en) * | 2022-09-29 | 2022-12-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving combustion rate of blast furnace coal powder injection of vanadium titano-magnetite and quality of molten iron |
-
2005
- 2005-02-02 CN CN 200510045828 patent/CN1276980C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392087A (en) * | 2011-11-23 | 2012-03-28 | 崔涛 | Novel spherical MgO-CaO metallurgy accessory for blast furnace |
| CN102392087B (en) * | 2011-11-23 | 2012-09-05 | 崔涛 | Novel spherical MgO-CaO metallurgy accessory for blast furnace |
| CN104060009A (en) * | 2013-12-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Adding method of desulfurizer in blast furnace ironmaking process and application |
| CN104060009B (en) * | 2013-12-06 | 2016-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The Adding Way of sweetening agent and application in a kind of blast furnace ironmaking process |
| CN106029911A (en) * | 2014-02-21 | 2016-10-12 | 三菱重工业株式会社 | Method for preparing coal to be injected into blast furnace, coal to be injected into blast furnace, and usage of same |
| CN105907951A (en) * | 2016-05-13 | 2016-08-31 | 辽宁科技大学 | Sintering additive and preparation method and application method thereof |
| CN105907951B (en) * | 2016-05-13 | 2018-09-21 | 辽宁科技大学 | A kind of sinter additives and its preparation and application |
| CN107955880A (en) * | 2016-10-18 | 2018-04-24 | 上海梅山钢铁股份有限公司 | A kind of additive for improving RDI of Sinter and preparation method thereof |
| CN112094969A (en) * | 2019-06-18 | 2020-12-18 | 美匡冶金技术研究院(苏州)有限公司 | Sintering method for reducing solid fuel consumption ratio |
| CN110687004A (en) * | 2019-09-30 | 2020-01-14 | 鞍钢股份有限公司 | Device and method for testing smelting performance of blast furnace blocky strip iron ore |
| CN110687004B (en) * | 2019-09-30 | 2022-03-22 | 鞍钢股份有限公司 | Device and method for testing smelting performance of blast furnace blocky strip iron ore |
| CN115505660A (en) * | 2022-09-29 | 2022-12-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving combustion rate of blast furnace coal powder injection of vanadium titano-magnetite and quality of molten iron |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1276980C (en) | 2006-09-27 |
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