CN103468849B - External heated shaft furnace reduction grinding sefstromite concentrate produces micro alloy iron powder technique - Google Patents
External heated shaft furnace reduction grinding sefstromite concentrate produces micro alloy iron powder technique Download PDFInfo
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- CN103468849B CN103468849B CN201310389545.1A CN201310389545A CN103468849B CN 103468849 B CN103468849 B CN 103468849B CN 201310389545 A CN201310389545 A CN 201310389545A CN 103468849 B CN103468849 B CN 103468849B
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Abstract
The present invention relates to mineral resources comprehensive utilization field, be specifically related to the novel process that a kind of external heated shaft furnace reduction grinding sefstromite concentrate prepares micro alloy iron powder.Contriver applies tunnel kiln reduction mill and selects method from vanadium titano-magnetite, fully utilize iron, titanium, the Technology of vanadium and method, external heated shaft furnace is transplanted wherein, substitute tunnel furnace, play the advantage that tunnel kiln reduction quality is high, stable and shaft furnace unit surface treatment capacity is large, refractory consumption rate is low.Separation of iron, titanium, vanadium is selected to test through Laboratary type external heated shaft furnace reduction test and reducing material mill thereof, integratedly captured reasonable selection furnace tube material and size, controlled reducing atmosphere quality, reserved furnace charge expanded by heating space, high-density is pressed into the billet being slightly less than boiler tube internal diameter, furnace charge move not with the technical problem such as boiler tube directly contacts, guarantee that furnace charge runs in reduction process smooth and easy, reducing material quality high, stable, not cracked, not sticky wall, non-nodulating, obtain the micro alloy iron powder that cost performance is high.
Description
Technical field
The present invention relates to mineral resources comprehensive utilization field, be specifically related to the novel process that a kind of external heated shaft furnace reduction grinding method prepares micro alloy iron powder from sefstromite concentrate.
Background technology
The method of domestic and international production powder metallurgy iron powder has tens of kinds more than, but realize industrialization only with the reduction method that high-purity refined iron-mineral and iron scale are raw material, leading technique of producing iron powder remains with solid carbon is now reductive agent, reduces the method (He Genasifa) of high-purity refined iron-mineral or iron scale in tunnel furnace.The present inventor develops and grinds with tunnel kiln reduction the technological process control selecting method to prepare micro alloy iron powder from sefstromite concentrate in [200810143675.6] with [CN102827985A] number patent.The increase selection kinds of processes proposed according to user and the demand of method, the technological process control of founding the factory at Steep Mountains as being suitable for, according to road kiln, then significantly can increase construction investment because of smooth mountain region.Accordingly, this patent is developed.
Summary of the invention
External heated shaft furnace direct-reduction process, is mainly used in the lump ore of single high-grad iron ore deposit or the pellet process of fine iron breeze, and the product of production is the sponge iron that power supply stove is smelted.Nineteen sixty-eight Danieli Off Mecc of Italy and the external heated shaft furnace coal-based direct reduction iron smelting method developed of Meng Tefunuo company of Switzerland put (referred to as KM method) into effect, and be country's employing on some many mountains, as Burma the 3rd 1981 ~ nineteen eighty-three of mining company successively introduces the KM subtraction unit of two cover annual output 20000 T sponge iron from Italy.Within 2007, Li Zhi loyalty has declared the utility model patent that the patent No. is " coal base direct-reduced " of 200720015482, is also process Iron grade more than 66% pellet.Old large unit in 2011; , Dong Ronghua etc. declared the patent of invention that the patent No. is " the gas-based shaft kiln directly reduced vanadium titano-magnetite non-blast furnace ironmaking technique " of 201110441319, this patent is a kind of internal heat type shaft furnace, product is a kind of sponge iron containing vanadium, titanium, through electrosmelting, realizes the separation of iron, titanium, vanadium.Through above-mentioned retrieval, there is not yet about external heated shaft furnace reduction grinding sefstromite concentrate prepares the report of micro alloy iron powder technique.
Summary of the invention
The present invention is on the basis of independent research patent [200810143675.6] with [20120257024.6], contriver applies tunnel kiln reduction mill and selects method from vanadium titano-magnetite, fully utilize iron, titanium, the Technology of vanadium and method, external heated shaft furnace is transplanted wherein, substitute tunnel furnace, play the advantage that tunnel kiln reduction material quality is high, stable and shaft furnace unit surface treatment capacity is large, refractory materials consumption is low, realize strong complementary.In the Laboratary type external heated shaft furnace of high 500 ㎜, diameter 55 ㎜, carried out reduction test, and the mill of reducing material selects separation of iron, titanium, vanadium to test.Compared with producing micro alloy iron powder technique with existing tunnel kiln reduction grinding sefstromite concentrate, obtain following technical functionality effect:.
The first, external heated shaft furnace reduction grinding method substitutes tunnel kiln reduction mill and selects method, granularity-200 order 65 ~ 95% can be produced out from sefstromite concentrate, micro alloy iron powder that TFe grade 98.5 ~ 99.5%, solid solution have trace V, Ti, Co, Ni, produce micro alloy iron powder for sefstromite concentrate and comprehensive utilization provides a kind of new technique and approach.
The advantages such as the second, external heated shaft furnace unit surface treatment capacity is large, is suitable for the investment in cliffy mountain and founds the factory, with tunnel furnace ratio, have economizing the land resource, reduce earth and rock works, reduced investment, scaleable, changeable.
Three, reduction shaft furnace is by preheating-burn till-cool three temperature band realizations, and furnace tube material is in steady state at differing temps band, alternately can not occur the situation of rapid heat cycle, extend the work-ing life of boiler tube, compared with tunnel furnace, can significantly reduce refractory materials consumption, reduce operational cost.
Four, devise the Novel furnace body structure of the difficult reduction feature of suitable treatment sefstromite concentrate shown in accompanying drawing 2, integratedly captured reasonable selection furnace tube material and size, control reducing atmosphere quality, reserve furnace charge expanded by heating space, high-density is pressed into the billet being slightly less than boiler tube internal diameter, furnace charge move not with the technical problem such as boiler tube directly contacts.With internal heat type shaft furnace ratio, both the problem that furnace charge glues wall dross and discharging difficulty had been solved, turn avoid air-flow in reduction process and mix (existing reducing gas, also oxidizing gas) problem, guarantee that furnace charge runs smooth and easy, reducing material steady quality, not cracked, the sticky process difficulties such as wall, non-nodulating in reduction process.Compared with existing external heated shaft furnace, it is not identical in mineral type, range of product, furnace binding, boiler tube shape are many with material, furnace charge making method, technical process control etc., can not sefstromite concentrate be processed with existing external heated shaft furnace, can not directly output for the micro alloy iron powder of sintered metal product.
Five, furnace charge moves from top to bottom in shaft furnace, and speed, by deadweight and material discharging machine regulation and control, compared with tunnel furnace, is conducive to realizing the automatization of loading, unloading material, reduces labor intensity, height of raising labour productivity.
Six, install residual heat using device at cooling zone, the high-temperature vapour of output can be used for generating or other purposes, compared with tunnel furnace, and can be significantly energy-conservation.
6th, except sefstromite concentrate, the present invention also provides a kind of new Application way for concentrated ilmenite, spathic iron ore, limonite, laterite and oolitic hematite etc., has broad application prospects.
For realizing above-mentioned technical functionality effect, this patent proposes following technical scheme:.
The first, the external heated shaft furnace furnace binding through test design is: one is body of heater height, according to production capacity needs, selects 5 meters ~ 30 meters scopes; Two is that the caliber of circular boiler tube is selected between 60 ~ 220mm, and boiler tube can be independent one, also can be many combinations; Three is the processes experiencing preheating-burn till-cool according to furnace charge in boiler tube, from top to bottom boiler tube is divided into external heat preheating zone, external heat temperature controls at 950 ~ 1050 DEG C (output particulate micro alloy iron powders) and the clinkering zone (or claiming zone of reduction) of two kinds of calcining systems of 1150 ~ 1220 DEG C (output rower micro alloy iron powders) and the cooling zone without external heat source; Four is according to boiler tube in the temperature capability of differing temps band and billet furnace charge expanded by heating situation, and the boiler tube internal diameter of high temperature reduction band is slightly larger than preheating zone and cooling zone boiler tube internal diameter, and the radial thermal expansion for furnace charge billet leaves and enough moves radially space; Five is that the boiler tube of preheating zone and cooling zone adopts fireclay refractory in order to reduce construction investment, and the clinkering zone of 950 ~ 1050 DEG C adopts Heat-Resisting Stainless Steel Tube, and 1150 ~ 1220 DEG C of clinkering zones adopt vitrified pipe; Six is set up residual heat using device at cooling zone, energy-saving and emission-reduction.
The second, for eliminating lump ore or pellet directly contacts with boiler tube inwall, expanded by heating efflorescence and glue the technology trouble of wall dross, this patent adopt levigate to-200 orders account for more than 85% sefstromite concentrate and reductive agent, additive is through the furnace charge of preparing burden, mix, be compressed to high density charge billet with automatic hydraulic press, billet external diameter is 50 ~ 200 ㎜, and be that 60 ~ 220 ㎜ boiler tube internal diameters are corresponding one by one with internal diameter, when furnace charge moves down, because of reserved certain radial space, guarantee that billet furnace charge is in reduction process, does not directly contact with boiler tube inwall.
Three, adopt the discharge velocity of material discharging machine to control the descending translational speed of furnace charge, guarantee that furnace charge is 15 ~ 25 hours (determining according to dissimilar sefstromite concentrate) in the soaking time of clinkering zone.
Four, the heating system of external heated shaft furnace can adopt electrically heated, coal gas and Sweet natural gas, according to local resources condition of founding the factory, selects any one as heating source.
Accompanying drawing explanation
Fig. 1 is external heated shaft furnace reduction grinding method process flow sheet.
Fig. 2 is external heated shaft furnace structural representation, and in figure, 1 is extraction hood, and 2 is hopper loader, and 3 is lagging material, and 4 for being heating chamber, and 5 is thermal source, and 6 is cooling zone residual heat using device, and 7 is circular boiler tube, and 8 is billet furnace charge, and 9 is discharger.
Embodiment
Adopt Fig. 2 technical process, by weight batching, by sefstromite concentrate 100 parts, mix as furnace charge with additive 0 ~ 20 part and solid reductant 15 ~ 25 parts, wherein additive is at least one in sodium-chlor, sodium sulfate, sodium carbonate, and solid reductant is at least one in hard coal, broken Jiao, refinery coke, brown coal, coke; Furnace charge is pressed into the billet (being less than boiler tube internal diameter) of 50 ~ 200 ㎜ through automatic hydraulic press; Briquetting loads external heated shaft furnace reduction through loading machine, burns till, and is incubated 15 ~ 25h, obtain billet reducing material 950 ~ 1050 DEG C or 1150 ~ 1220 DEG C; Be separated through fragmentation, wet-milling, magnetic separation, obtain the mine tailing of the concentrate of micro alloy iron powder and Vanadium Concentrationin, titanium; Concentrate is through essence reduction (or claiming secondary reduction), again crushing and screening, conjunction batch shaping, and make granularity-200 order 65 ~ 95%, TFe grade 98.5 ~ 99.5%, solid solution has the micro alloy iron powder of trace V, Ti, Co, Ni.
Claims (1)
1. external heated shaft furnace reduction grinding sefstromite concentrate prepares the technique of micro alloy iron powder, external heated shaft furnace is it is characterized in that to transplant wherein, substitute tunnel furnace, play tunnel kiln reduction material quality high, stable large with shaft furnace unit surface treatment capacity, the advantage that refractory materials consumption is low, at high 500 ㎜, reduction test has been carried out in the Laboratary type external heated shaft furnace of diameter 55 ㎜, and the mill of reducing material selects separation of iron, titanium, vanadium is tested, produce out granularity-200 order 65 ~ 95%, TFe grade 98.5 ~ 99.5%, solid solution has trace V, Ti, Co, the micro alloy iron powder of Ni, micro alloy iron powder is produced and comprehensive utilization provides a kind of technique and approach for sefstromite concentrate, its main technologic parameters is:
(1) external heated shaft furnace furnace binding: is body of heater height, according to production capacity needs, select 5 meters ~ 30 meters scopes, two is that the caliber of circular boiler tube is selected between 60 ~ 220mm, boiler tube is independent one, or many combinations, three is the processes experiencing preheating-burn till-cool according to furnace charge in boiler tube, from top to bottom boiler tube is divided into external heat preheating zone, external heat temperature control 950 ~ 1050 DEG C with the clinkering zone of 1150 ~ 1220 DEG C of two kinds of calcining systems and the cooling zone without external heat source, four is that the boiler tube internal diameter of clinkering zone is slightly larger than preheating zone and cooling zone boiler tube internal diameter, radial thermal expansion for furnace charge billet leaves and enough moves radially space, five is that the boiler tube of preheating zone and cooling zone adopts fireclay refractory, the clinkering zone of 950 ~ 1050 DEG C adopts Heat-Resisting Stainless Steel Tube, 1150 ~ 1220 DEG C of clinkering zones adopt vitrified pipe, six is set up residual heat using device at cooling zone,
(2) furnace charge: adopt levigate to-200 orders account for more than 85% sefstromite concentrate and reductive agent, additive is through the furnace charge of preparing burden, mix, be compressed to high-density billet with automatic hydraulic press, billet external diameter is 50 ~ 200 ㎜, and be that 60 ~ 220 ㎜ boiler tube internal diameters are corresponding one by one with internal diameter, when furnace charge moves down, directly do not contact with boiler tube inwall.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065226A (en) * | 1991-03-23 | 1992-10-14 | 冶金工业部长沙矿冶研究院 | Method for preparing microalloy iron powder by reduction grinding and selecting method |
| CN101832706A (en) * | 2010-04-30 | 2010-09-15 | 攀枝花市创盛粉末冶金有限责任公司 | External combustion tube type direct reduction shaft furnace |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065226A (en) * | 1991-03-23 | 1992-10-14 | 冶金工业部长沙矿冶研究院 | Method for preparing microalloy iron powder by reduction grinding and selecting method |
| CN101832706A (en) * | 2010-04-30 | 2010-09-15 | 攀枝花市创盛粉末冶金有限责任公司 | External combustion tube type direct reduction shaft furnace |
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