CN101117649B - Method for carrying alkali metal on top of blast furnace charge and device thereof - Google Patents
Method for carrying alkali metal on top of blast furnace charge and device thereof Download PDFInfo
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- CN101117649B CN101117649B CN2007101322017A CN200710132201A CN101117649B CN 101117649 B CN101117649 B CN 101117649B CN 2007101322017 A CN2007101322017 A CN 2007101322017A CN 200710132201 A CN200710132201 A CN 200710132201A CN 101117649 B CN101117649 B CN 101117649B
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Abstract
The present invention provides a method and a device for loading the alkali metals on the blast furnace charging, and belongs to the blast furnace iron smelting technology field. The device is arranged with a heating furnace, an alkali metals loading device containing a cooling device, and a vacuum system in turn. The alkali metals K or/and Na, and blast furnace charging, such as coke, sintered ore and pellet are loaded in the alkali metals loading device, which is put into the heating furnace after being sealed; the vacuum pumping pressure is kept in a curtain pressure range, and the Argon is charged to make the pressure in the loading device kept at 0Pa around; being heated to 800-900 DEG C by the heating furnace, using the characteristic of low melting point and low boiling point of the alkali metals of K or/and Na, by the vapor deposition, the alkali metals of K or/and Na are loaded on the surface of the charging, and under the action of oxygen, the loaded alkali metals of K or/and Na exist on the charging in the form of alkali metal oxide. The present invention is characterized in that the non damaging load of the alkali metals to the blast furnace radically overcomes the deterioration of the charging caused by the dipping means, and the shortcoming of late metallurgical properties testing by the dipping means.
Description
Technical field:
The invention belongs to technical field of blast furnace ironmaking, be specifically related to method and the device thereof of a kind of carrying alkali metal at blast furnace burden.
Background technology:
The raw material that blast furnace uses, the basic metal potassium oxide (K that fuel all contains some amount
2O) and basic metal sodium oxide (Na
2O), bring blast furnace into after, under high temperature (1500 ℃～2000 ℃),, become the steam of potassium metal and sodium by the reduction of carbon, rise with coal gas stream, with FeO and the SiO in the furnace charge that descends
2Composition reacts, and can enter the high-temperature zone again and be reduced, and has so formed up and down circulation and the enrichment of basic metal in blast furnace.The harm of basic metal in blast-furnace smelting is very big, it not only can reduce ore softening temperature, cause pellet unusual expansion and serious efflorescence, strengthen the gasification reaction ability of coke, post-reaction strength is sharply reduced and efflorescence, cause the permeability of stock column severe exacerbation, and cause fire resisting material of furnace body dross or destroyed, normally the carrying out of harm blast-furnace smelting.
Blast furnace maximizes and oxygen enrichment big coal injection reinforcing blast furnace to smelt be the development trend of ironmaking production, thus raw material, fuel are subjected to basic metal erosion etc. in blast furnace and have higher requirement.Along with the continuous development of ironmaking technology, the specification of quality of the skeleton function of STRENGTH ON COKE, pellet and agglomerate is more and more higher.Practice is for many years thought the fluctuation of following raw material and fuel quality with research, and after the basic metal in the blast furnace reached some amount, STRENGTH ON COKE, agglomerate and pellet played tangible destruction, and the aggravation working of a furnace worsens, and makes the smooth operation of furnace variation.
Therefore, the behavior that influences and the rule of research basic metal, fuel performance former to blast furnace, for the science operation of blast furnace provides scientific basis, the experimental installation of wherein resolving basic metal load on furnace charge and method are to carry out the key studied aspect this this smoothly.
The basic metal carrying method mainly adopts pickling process at present, as: lump coke be impregnated in different concns yellow soda ash and solution of potassium carbonate immersion, make the sample of different potassium, sodium content, study then.But the alkali-metal method of dip loading can be damaged the coke former state, directly adopts alkali metal vapour that basic metal is loaded on the coke technology and method, and this method can also load on basic metal on agglomerate and the pellet.
Summary of the invention:
The present invention is directed to existing basic metal and load on the deficiency that exists in the blast furnace burden method, method and the device thereof of a kind of carrying alkali metal at blast furnace burden is provided.This inventive method is carried out alkali-metal harmless load to blast furnace burden, for provide the more foundation of science to blast furnace burden later stage metallurgical performance mensuration in the laboratory.
A kind of carrying alkali metal provided by the invention is specific as follows in the method for blast furnace burden:
1, weighing basic metal K, Na or both sums as 0.1～5g, are placed in the Stainless Steel Crucible, put into a certain proportion of blast furnace burden then, as 200～1000g, blast furnace burden is coke or agglomerate or pellet or other blast furnace burden, on stainless steel lid cover.
2, the Stainless Steel Crucible that basic metal and blast furnace burden sample will be housed places the bottom of load device, by gasket and bolt refrigerating unit and load device is tightly connected then, places High Temperature Furnaces Heating Apparatus.
3, vacuum unit vacuumizes load device and refrigerating unit, the vacuum pressure gauge pressure maintains-0.09～-0.092MPa between, charge into Ar gas then, make the intravital pressure of tube maintain 0Pa.
4, with the temperature rise rate of 5～10 ℃/min, the temperature of load device is heated to 800～900 ℃, insulation 10～30min, basic metal evaporation filling also loads on the blast furnace burden.
5, be cooled to room temperature, the inlet mouth of slowly opening T-valve charges into air, the basic metal K after the load or/and Na under the oxygen effect of air, finally make load basic metal K or/and Na be present on the furnace charge with the alkalimetal oxide form.
Content by alkalimetal oxide in the chemical analysis furnace charge, calculate alkali-metal percent load:
R
NaThe percent load of %-alkali metallic sodium;
W
1Na in the furnace charge after the-load (coke, agglomerate or pellet)
2The content of O;
W
2The content of Na in the furnace charge (coke, agglomerate or pellet) before-the load;
R
KThe percent load of %-basic metal potassium;
W
3K in the furnace charge after the-load (coke, agglomerate or pellet)
2The content of O;
W
4The content of K in the furnace charge (coke, agglomerate or pellet) before-the load.
Adopt the device of a kind of carrying alkali metal of the inventive method at blast furnace burden, this device is made up of load device 1, refrigerating unit 2, vacuum unit, process furnace 10, heating unit 11, Stainless Steel Crucible 12 and corresponding pipeline.Refrigerating unit 2 is equipped with water-in 3 and water outlet 7, adopts bolt 9 to connect with load device 1, and seals with gasket 8.Load device 1 places process furnace 10, supports with refractory brick 14.Vacuum system connects with load device 1 by bleeding point 4, and vacuum pressure shows by being installed in cooling zone 2 top vacuum pressure gauges 6.Argon gas charges in the load device 1 by the inlet mouth on the T-valve 5.
The invention has the advantages that: the method uniqueness, install comparatively simply, overcome the infringement of infusion method to furnace charge, fundamentally solved after the load of test basic metal test problem to the furnace charge metallurgical performance.
Description of drawings:
The apparatus structure synoptic diagram of Fig. 1 carrying alkali metal on blast furnace burden
Among the figure: 1-load device 2-refrigerating unit 3-water-in 4-bleeding point 5-inlet mouth 6-vacuum pressure gauge 7-water outlet 8-gasket 9-bolt 10-process furnace 11-heating unit 12-Stainless Steel Crucible 13-sample 14-refractory brick
Embodiment:
Embodiment 1: weighing 1.5g basic metal K, and coke 300g is heated to 800 ℃ with the temperature rise rate of 7.5 ℃/min with the temperature of basic metal load device, and insulation 10min detects by chemical analysis at last, loads on the K on the coke
2O content is 0.49%, and the basic metal percent load is 85.4%.
Embodiment 2: weighing 3.5g Alkali-Metal Na, and agglomerate 700g is heated to 900 ℃ with the temperature rise rate of 7.5 ℃/min with the temperature of basic metal load device, and insulation 10min detects by chemical analysis at last, loads on the Na on the agglomerate
2O content is 0.63%, and the basic metal percent load is 91.02%.
Embodiment 3: weighing 1.75g basic metal K, and the 1.75g Alkali-Metal Na, pellet 700g is heated to 900 ℃ with the temperature rise rate of 7.5 ℃/min with the temperature of basic metal load device, and insulation 10min detects by chemical analysis at last, loads on the K on the pellet
2O content is 0.26%, Na
2O content is 0.30%, and being equivalent to basic metal K percent load is 90.3%; The Alkali-Metal Na percent load is 64.5%.
Claims (1)
1. the method for a carrying alkali metal on blast furnace burden is characterized in that the concrete steps of this method are as follows:
(1) weighing basic metal K or Alkali-Metal Na or both sums of basic metal K, Na, put into Stainless Steel Crucible, put into a certain proportion of blast furnace burden around basic metal, this blast furnace burden is coke or agglomerate or pellet or other blast furnace burden, uses the stainless steel lid with on the crucible cover then;
(2) Stainless Steel Crucible that basic metal and blast furnace burden sample will be housed places the bottom of load device, by gasket and bolt refrigerating unit and load device is tightly connected then, places High Temperature Furnaces Heating Apparatus;
(3) vacuum unit vacuumizes load device and refrigerating unit, the vacuum pressure gauge pressure maintains-0.09～-0.092MPa between, charge into Ar gas then, make the pressure in the load device maintain 0Pa;
(4) with the temperature rise rate of 5～10 ℃/min the temperature of load device is heated to 800～900 ℃, insulation 10～30min, basic metal evaporation filling also loads on the blast furnace burden;
(5) be cooled to room temperature, the inlet mouth of slowly opening T-valve charges into air, the basic metal K after the load or/and Alkali-Metal Na under the oxygen effect of air, finally make load basic metal K or/and Na be present on the furnace charge with the alkalimetal oxide form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101322017A CN101117649B (en) | 2007-09-25 | 2007-09-25 | Method for carrying alkali metal on top of blast furnace charge and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101322017A CN101117649B (en) | 2007-09-25 | 2007-09-25 | Method for carrying alkali metal on top of blast furnace charge and device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101117649A CN101117649A (en) | 2008-02-06 |
| CN101117649B true CN101117649B (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101322017A Expired - Fee Related CN101117649B (en) | 2007-09-25 | 2007-09-25 | Method for carrying alkali metal on top of blast furnace charge and device thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914644B (en) * | 2010-08-05 | 2013-02-13 | 马鞍山钢铁股份有限公司 | Blast furnace feeding material alkali metal fusion loading device and method thereof |
| CN103882166B (en) * | 2014-04-03 | 2016-01-20 | 首钢总公司 | Alkali vapor generation rate regulation device |
| CN104316429B (en) * | 2014-09-26 | 2016-06-15 | 北京科技大学 | The method of test alkali metal and zinc fume STRENGTH ON COKE destruction and performance impact |
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