CN110283951A - A method of promote titanium nitride during blast furnace process high-purity pig iron to be precipitated in furnace - Google Patents
A method of promote titanium nitride during blast furnace process high-purity pig iron to be precipitated in furnace Download PDFInfo
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- CN110283951A CN110283951A CN201910716801.0A CN201910716801A CN110283951A CN 110283951 A CN110283951 A CN 110283951A CN 201910716801 A CN201910716801 A CN 201910716801A CN 110283951 A CN110283951 A CN 110283951A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/02—General features in the manufacture of pig-iron by applying additives, e.g. fluxing agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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Abstract
The present invention provides a kind of method that is precipitated in furnace of titanium nitride in promotion blast furnace process high-purity pig iron, include the following steps: that nitrogenous material is uniformly mixed after broken, screening with the common coal dust of blast furnace blowing by (1), obtain the nitrogenous coal powder injection material of blast furnace, mixed mass percent is nitrogenous material 10%~30%, coal dust 70%~90%, nitrogenous material includes following components in percentage by weight: N 25~35%, Mn 5~10%, Fe 10~15%, Si 35~45%；(2) the nitrogenous coal powder injection material of blast furnace is put into the injection tank of bf coal injection system, is blown pipeline and is transported to blast-furnace tuyere, is entered in blast furnace through coal injection of draught rifle.A kind of nitrogenous coal powder injection material of blast furnace blowing of the present invention, nitrogenous material enter molten iron, avoid the influence of slag blanket, improve TiN and environment is precipitated.In conjunction with normal coal powder injection process, nitrogenous material is uniformly blown, and does not generate the segregation phenomena of coal dust Yu nitrogenous material, can significantly improve TiN amount of precipitation, does not change blast fumance technique and equipment flowsheet, and industrial production is adaptable.
Description
Technical field
The present invention relates to technical field of blast furnace ironmaking, and in particular to a kind of promotion blast furnace process high-purity pig iron nitridation in the process
The method that titanium is precipitated in furnace.
Background technique
High-purity pig iron refers to Ti, Mn, S, and the constituent contents such as P are low, specific micronutrient levels is seldom specializes in premium casting
The pig iron of production.Currently, the smelting process of high-purity pig iron mainly has oxidizing process and fine fodder method.
Oxidizing process refers to iron liquid oxygen or converting with air, removes Si therein, Mn, Ti, V, Cr, P etc..The technique pair
Blast furnace raw material can control without particular/special requirement, Trace Element in Pig Iron, but the technology is complicated, at high cost, low output.State
Oxidizing process is mostly used to produce high-purity pig iron greatly outside.
Fine fodder method is, using ore-proportioning method, to control harmful element by selecting the crude fuels such as phosphorus concentrate powder, coke, coal
Furnace entering volume improves blast furnace operating system, optimizes blast furnace process condition, realizes the control restored to certain harmful elements, thus raw
Produce high-purity pig iron.Most Cast Iron Production enterprise, China uses the method.But as the supply of fine fodder is constantly reduced, fine fodder
The limitation of method production high-purity pig iron gradually shows, using Ti element as Typical Representative.
Ti is a very active element, has a very strong chemical affinity with C, N, O, easily formation TiN, TiC and Ti (N,
C) the compounds such as solid solution, stretching and fatigue behaviour to casting have larger harm.High-purity pig iron must be strictly controlled Ti content.
Machinery industry " casting high-purity pig iron " standard formulated and promulgated by the Ministry of Industry and Information Technology, the People's Republic of China (PRC) for 2014,
Turn to two-stage, C1:wTi≤0.01%, C2:wTi≤0.03%.But with the worsening shortages of low Ti fine fodder, cause because Ti is exceeded
It is the phenomenon that high-purity pig iron " impure ", commonplace.
From thermodynamics and kinetics condition analysis, TiN, TiC and Ti (N, C) solid solution be precipitated with Ti in molten iron, N content and
Temperature is related.In one timing of Ti content, molten iron temperature is higher, and N content is higher in molten iron, and the TiN for reaching precipitation condition is more.
Existing high-purity pig iron smelts mode, can control and improve molten iron temperature, but cannot improve N content in molten iron, therefore cause
More TiN cannot be precipitated in molten iron and stay in furnace.
Therefore, under conditions of not changing existing high-purity pig iron production method and process, it is high that urgent need develops a kind of promotion
The method that titanium nitride is precipitated in furnace during the furnace smelting high-purity pig iron.
Summary of the invention
The invention aims to make up prior art defect, titanium nitride in a kind of promotion blast furnace process high-purity pig iron is provided
The method being precipitated in furnace promotes that more TiN are precipitated and stays in furnace.
To achieve the above object, the present invention is achieved by following scheme:
The present invention provides a kind of method that is precipitated in furnace of titanium nitride in promotion blast furnace process high-purity pig iron, including walks as follows
It is rapid:
(1) nitrogenous material is uniformly mixed after broken, screening with the common coal dust of blast furnace blowing, obtains the nitrogenous spray of blast furnace
Coal charge, mixed mass percent are nitrogenous material 10%~30%, and coal dust 70%~90%, nitrogenous material includes following weight
The component of percentage: N 25~35%, Mn 5~10%, Fe 10~15%, Si 35~45%；
(2) the nitrogenous coal powder injection material of blast furnace is put into the injection tank of bf coal injection system, is blown pipeline and is transported to blast furnace wind
Mouthful, enter in blast furnace through coal injection of draught rifle.
Preferably, nitrogenous material solids material maximum particle diameter≤2.0mm accounts for 60~90% less than 200 mesh granularities.
Preferably, the nitrogenous coal powder injection material of blast furnace includes nitrogenous material 15~25%, the common coal of blast furnace blowing by mass percentage
Powder 75~85%.
Preferably, the nitrogenous coal powder injection material of blast furnace includes nitrogenous material 18%, the common coal dust of blast furnace blowing by mass percentage
82%.
Preferably, in step (1), nitrogenous material and coal dust mixing step are as follows:
A, nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, is added to by the charging gear of blending bunker orlop
The main belt of raw coal enters the run coal bin of powder processed together with raw coal；
B, the nitrogenous material and raw coal tentatively mixed in run coal bin is processed as mixing through coal pulverizer and cloth bag collection machine
The nitrogenous coal powder injection material of even blast furnace.
The beneficial effects of the present invention are:
In existing blast furnace process high-purity pig iron technology, in addition to temperature factor, the evolution reaction of TiN is by molten iron in the pig iron
Ti content and N content controlled, with TiO in slag2Content is unrelated.But since in slag iron interface, the covering of slag blanket, molten iron is not
It can directly be contacted with furnace gas, the nitrogen in furnace gas can only be dissolved in slag, then reach slag iron interface, this mass transport process through slag blanket
Resistance it is very big, lack N in molten iron, TiN is precipitated difficult.A kind of nitrogenous coal powder injection material of blast furnace blowing of the present invention, nitrogenous material enter
Molten iron avoids the influence of slag blanket, improves TiN and environment is precipitated.In conjunction with normal coal powder injection process, nitrogenous material is uniformly blown, no
The segregation phenomena for generating coal dust and nitrogenous material, can significantly improve TiN amount of precipitation, not change blast fumance technique and equipment
Process, industrial production are adaptable.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
All other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Embodiment 1.
In certain 142m3The nitrogenous coal powder injection material of blast furnace blowing includes by mass percentage nitrogenous material 15%, and blast furnace blowing is common
Uniformly mixed nitrogenous coal powder injection material is conveyed into blast furnace by coal dust 85% through bf coal injection system.
The chemical component and content of nitrogenous material are N=28%, Mn=10%, Fe=16%, Si=42%.
Nitrogenous material solids material maximum particle diameter≤1.6mm accounts for 68% less than 200 mesh granularities.
The present invention is included the following steps: using the method that bf coal injection system is blown nitrogenous coal powder injection material
(1) nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, is added by the charging gear of blending bunker orlop
To the main belt of raw coal, the run coal bin of powder processed, the nitrogenous material and raw coal tentatively mixed in run coal bin are entered together with raw coal
Uniformly mixed nitrogenous coal powder injection material is processed as through coal pulverizer and cloth bag collection machine, nitrogenous coal powder injection contains by including mass percent 15%
Nitrogen material and the common coal dust of 85% blast furnace blowing.
(2) uniformly mixed nitrogenous coal powder injection material is put into the injection tank of bf coal injection system, is blown pipeline and is transported to
Blast-furnace tuyere enters in blast furnace through coal injection of draught rifle.
Nitrogenous 82 tons of coal powder injection material of total blowing, obtains good result.
Embodiment 2
In certain 410m3The nitrogenous coal powder injection material of blast furnace blowing includes by mass percentage nitrogenous material 25%, and blast furnace blowing is common
Uniformly mixed nitrogenous coal powder injection material is conveyed into blast furnace by coal dust 75% through bf coal injection system.
The chemical component and content of nitrogenous material are N=32%, Mn=8%, Fe=15%, Si=42%.
Nitrogenous material solids material maximum particle diameter≤1.7mm accounts for 62% less than 200 mesh granularities.
The present invention is included the following steps: using the method that bf coal injection system is blown nitrogenous coal powder injection material
(1) nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, is added by the charging gear of blending bunker orlop
To the main belt of raw coal, the run coal bin of powder processed, the nitrogenous material and raw coal tentatively mixed in run coal bin are entered together with raw coal
Uniformly mixed nitrogenous coal powder injection material is processed as through coal pulverizer and cloth bag collection machine.
(2) uniformly mixed nitrogenous coal powder injection material is put into the injection tank of bf coal injection system, is blown pipeline and is transported to
Blast-furnace tuyere enters in blast furnace through coal injection of draught rifle.
Nitrogenous 98 tons of coal powder injection material of total blowing, obtains good result.
Embodiment 2
In certain 410m3The nitrogenous coal powder injection material of blast furnace blowing includes by mass percentage nitrogenous material 25%, and blast furnace blowing is common
Uniformly mixed nitrogenous coal powder injection material is conveyed into blast furnace by coal dust 75% through bf coal injection system.
The chemical component and content of nitrogenous material are N=32%, Mn=8%, Fe=15%, Si=42%.
Nitrogenous material solids material maximum particle diameter≤1.7mm accounts for 62% less than 200 mesh granularities.
The present invention is included the following steps: using the method that bf coal injection system is blown nitrogenous coal powder injection material
(1) nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, is added by the charging gear of blending bunker orlop
To the main belt of raw coal, the run coal bin of powder processed, the nitrogenous material and raw coal tentatively mixed in run coal bin are entered together with raw coal
Uniformly mixed nitrogenous coal powder injection material is processed as through coal pulverizer and cloth bag collection machine.
(2) uniformly mixed nitrogenous coal powder injection material is put into the injection tank of bf coal injection system, is blown pipeline and is transported to
Blast-furnace tuyere enters in blast furnace through coal injection of draught rifle.
Nitrogenous 98 tons of coal powder injection material of total blowing, obtains good result.
Embodiment 3
In certain 220m3The nitrogenous coal powder injection material of blast furnace blowing includes by mass percentage nitrogenous material 25%, and blast furnace blowing is common
Uniformly mixed nitrogenous coal powder injection material is conveyed into blast furnace by coal dust 75% through bf coal injection system.
The chemical component and content of nitrogenous material are N=30%, Mn=8%, Fe=15%, Si=45%.
Nitrogenous material solids material maximum particle diameter≤1.6mm accounts for 75% less than 200 mesh granularities.
The present invention is included the following steps: using the method that bf coal injection system is blown nitrogenous coal powder injection material
(1) nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, is added by the charging gear of blending bunker orlop
To the main belt of raw coal, the run coal bin of powder processed, the nitrogenous material and raw coal tentatively mixed in run coal bin are entered together with raw coal
Uniformly mixed nitrogenous coal powder injection material is processed as through coal pulverizer and cloth bag collection machine.
(2) uniformly mixed nitrogenous coal powder injection material is put into the injection tank of bf coal injection system, is blown pipeline and is transported to
Blast-furnace tuyere enters in blast furnace through coal injection of draught rifle.
Nitrogenous 95 tons of coal powder injection material of total blowing, obtains good result.
Embodiment 4
In certain 300m3The nitrogenous coal powder injection material of blast furnace blowing includes by mass percentage nitrogenous material 18%, and blast furnace blowing is common
Uniformly mixed nitrogenous coal powder injection material is conveyed into blast furnace by coal dust 82% through bf coal injection system.
The chemical component and content of nitrogenous material are N=25%, Mn=10%, Fe=15%, Si=44%.
Nitrogenous material solids material maximum particle diameter≤1.8mm accounts for 83% less than 200 mesh granularities.
The present invention is included the following steps: using the method that bf coal injection system is blown nitrogenous coal powder injection material
(1) nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, is added by the charging gear of blending bunker orlop
To the main belt of raw coal, the run coal bin of powder processed, the nitrogenous material and raw coal tentatively mixed in run coal bin are entered together with raw coal
Uniformly mixed nitrogenous coal powder injection material is processed as through coal pulverizer and cloth bag collection machine.
(2) uniformly mixed nitrogenous coal powder injection material is put into the injection tank of bf coal injection system, is blown pipeline and is transported to
Blast-furnace tuyere enters in blast furnace through coal injection of draught rifle.
Nitrogenous 87 tons of coal powder injection material of total blowing, obtains good result.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention
In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.
Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, also do not limit the specific embodiment of the invention.Obviously, according to the content of this specification, can make very much
Modifications and variations.These embodiments are chosen and specifically described to this specification, be principle in order to better explain the present invention and
Practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only wanted by right
Ask the limitation of book and its full scope and equivalent.
Claims (5)
1. a kind of promote the method that titanium nitride is precipitated in furnace in blast furnace process high-purity pig iron, include the following steps:
(1) nitrogenous material is uniformly mixed after broken, screening with the common coal dust of blast furnace blowing, obtains the nitrogenous coal powder injection of blast furnace
Material, mixed mass percent are nitrogenous material 10~30%, and coal dust 70~90%, nitrogenous material includes following weight percent
Component: N 25~35%, Mn5~10%, Fe 10~15%, Si 35~45%；
(2) the nitrogenous coal powder injection material of blast furnace is put into the injection tank of bf coal injection system, is blown pipeline and is transported to blast-furnace tuyere, is passed through
Coal injection of draught rifle enters in blast furnace.
2. according to claim 1 promote the method that titanium nitride is precipitated in furnace in blast furnace process high-purity pig iron, feature
It is, the nitrogenous material solids material maximum particle diameter≤2.0mm accounts for 60~90% less than 200 mesh granularities.
3. according to claim 1 promote the method that titanium nitride is precipitated in furnace in blast furnace process high-purity pig iron, feature
It is, the nitrogenous coal powder injection material of blast furnace includes nitrogenous material 15~25% by mass percentage, the common coal dust of blast furnace blowing 75~
85%.
4. according to claim 1 promote the method that titanium nitride is precipitated in furnace in blast furnace process high-purity pig iron, feature
It is, the nitrogenous coal powder injection material of blast furnace includes nitrogenous material 18%, the common coal dust 82% of blast furnace blowing by mass percentage.
5. according to claim 1 promote the method that titanium nitride is precipitated in furnace in blast furnace process high-purity pig iron, feature
It is, in the step (1), nitrogenous material and coal dust mixing step are as follows:
A, nitrogenous material is packed into the blending bunker of blast-furnace coal powder raw coal field, raw coal is added to by the charging gear of blending bunker orlop
Main belt, together with raw coal enter powder processed run coal bin；
B, the nitrogenous material and raw coal tentatively mixed in run coal bin is processed as uniformly mixed through coal pulverizer and cloth bag collection machine
The nitrogenous coal powder injection material of blast furnace.
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| CN201910716801.0A CN110283951A (en) | 2019-08-05 | 2019-08-05 | A method of promote titanium nitride during blast furnace process high-purity pig iron to be precipitated in furnace |
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| CN201910716801.0A CN110283951A (en) | 2019-08-05 | 2019-08-05 | A method of promote titanium nitride during blast furnace process high-purity pig iron to be precipitated in furnace |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000204405A (en) * | 1999-01-13 | 2000-07-25 | Kawasaki Steel Corp | Operation of blast furnace |
| CN1605632A (en) * | 2004-11-22 | 2005-04-13 | 东北大学 | Method for enrichment growth of TiN by deoxidation nitridation of mineralizer and processed titanium-containing blast furnace slag |
| CN105219897A (en) * | 2014-06-11 | 2016-01-06 | 鞍钢股份有限公司 | A kind of blast furnace protecting semicoke and using method thereof |
| CN106521060A (en) * | 2016-10-20 | 2017-03-22 | 新冶高科技集团有限公司 | Titanium-containing powder for blast furnace protection and furnace protection method for injection through blast furnace coal injection system |
| CN108504802A (en) * | 2018-05-11 | 2018-09-07 | 鞍钢股份有限公司 | A kind of blast furnace blowing furnace retaining material and its application method |
-
2019
- 2019-08-05 CN CN201910716801.0A patent/CN110283951A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000204405A (en) * | 1999-01-13 | 2000-07-25 | Kawasaki Steel Corp | Operation of blast furnace |
| CN1605632A (en) * | 2004-11-22 | 2005-04-13 | 东北大学 | Method for enrichment growth of TiN by deoxidation nitridation of mineralizer and processed titanium-containing blast furnace slag |
| CN105219897A (en) * | 2014-06-11 | 2016-01-06 | 鞍钢股份有限公司 | A kind of blast furnace protecting semicoke and using method thereof |
| CN106521060A (en) * | 2016-10-20 | 2017-03-22 | 新冶高科技集团有限公司 | Titanium-containing powder for blast furnace protection and furnace protection method for injection through blast furnace coal injection system |
| CN108504802A (en) * | 2018-05-11 | 2018-09-07 | 鞍钢股份有限公司 | A kind of blast furnace blowing furnace retaining material and its application method |
Non-Patent Citations (1)
| Title |
|---|
| 李丽英: ""高纯生铁生产工艺浅析"", 《科技探索》 * |
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Application publication date: 20190927 |