CN100537794C - Composite agglomeration technology of iron powdered ore - Google Patents
Composite agglomeration technology of iron powdered ore Download PDFInfo
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- CN100537794C CN100537794C CNB2005100320956A CN200510032095A CN100537794C CN 100537794 C CN100537794 C CN 100537794C CN B2005100320956 A CNB2005100320956 A CN B2005100320956A CN 200510032095 A CN200510032095 A CN 200510032095A CN 100537794 C CN100537794 C CN 100537794C
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Abstract
Composite agglomeration technology of iron powdered ore.The present invention tells granule iron concentrate separately and is prepared into pelletizing, again with coarse-grained contain to be taped against after powdered iron ore and other raw materials mix carry out roasting on the conventional sintering machine, make by acidic pellet ore and embed high basicity sinter and the compound iron-smelting furnace charge formed.Adopt the present invention, can fully, rationally utilize existing iron-bearing material; Overcome in the fine concentrate sintering process bed permeability poor, be difficult to the agglomerating shortcoming; The shortcoming of existing charging segregation when overcoming blast furnace and using agglomerate and pellet at the same time; Significantly reduce sintering energy consumption, save the investment of founding the factory.
Description
Technical field
The invention belongs to the ferrous metallurgy field, relate to a kind of utilization and contain powdered iron ore and prepare the method for blast furnace ironmaking with artificial composite block ore deposit.
Background technology
In recent years, also more and more higher to the requirement of iron-smelting raw material quality and quantity along with China's Iron And Steel Industry fast development, blast furnace ironmaking uses ore agglomerates's's (agglomerate and acidic pellet ore) ratio to surpass 90%.It is to adopt different prepared on different agglomeration equipment with pellet that used agglomerate is produced in ironmaking at present, and delivers to blast furnace hopper respectively, enters blast-furnace smelting after the batching in proportion.Practice shows: traditional sintering process must be produced high basicity sinter could guarantee sinter strength satisfying the requirement of blast-furnace smelting, and sintering process is not suitable for handling on a large scale the fine fraction iron ore concentrate; And the acid pellet ore production technology is to raw material granularity and moisture requirement harshness, to face the problem of resource scarcity, need to set up independently pelletizing plant simultaneously, the high temperature service investment is big, and newly-built pelletizing plant also is subjected to the restriction of conditions such as resource, factory site, thereby makes that fundamentally solving the acidic pellet ore for blast furnace problem of shortage has certain difficulty.
In addition,, cause both in blast furnace, to produce bigger segregation, influence blast furnace production process owing to agglomerate, the kinestate difference of pellet in State of Blast Furnace.
Summary of the invention
For rationally, make full use of fine ore and granule iron concentrate resource, solve the segregation problem that China's blast furnace is under-supply with acid burden material and blast furnace ironmaking uses agglomerate and pellet to exist, reduce sintering energy consumption, save the investment of founding the factory, realize blast furnace good quality and high output less energy-consumption production, special proposition the present invention.
Composite agglomeration technology of iron powdered ore, granule iron concentrate told separately be prepared into pelletizing, again with coarse-grained contain to be taped against after powdered iron ore and other raw materials mix carry out roasting on the conventional sintering machine, make by acidic pellet ore and embed high basicity sinter and the compound iron-smelting furnace charge formed.
It is that 30～60% granule iron concentrate adds binding agent and fuel is prepared burden, mixing that the present invention at first will account for all iron-bearing material per-cents, the binding agent add-on accounts for all iron-bearing materials 0～1.5%, the add-on of fuel accounts for all iron-bearing materials 0～1.5%, and compound is made diameter on balling disc be 8～16mm pelletizing; With accounting for all iron-bearing material per-cents is that 70～40% fine ore and other iron-bearing materials and flux and fuel are prepared burden, the flux add-on accounts for all iron-bearing materials 5.5～4.0%, fuel input accounts for all iron-bearing materials 5.0～3.5%, and by conventional sintering technology carry out once, the secondary combination treatment; With pelletizing and secondary compound mixing, carry out cloth, igniting, sintering on sinter machine then, whole grain gets complex sintered lump ore after cooling off.Whole grain back less than the fine ore of 5mm as returning charge.The sinter bed height is 500～900mm, igniting negative pressure 4～5kPa, ignition time 0.75～1min, sintering exhausting negative pressure 6～9kPa.
Described binding agent is wilkinite or unslaked lime.Described fuel is coke powder or pulverized anthracite.
Described granule iron concentrate be iron ore through ore grinding, sorting products obtained therefrom, general-200 order content are greater than 40%, the consumption in this technology accounts for 30%～60% of all iron-bearing materials.
Described iron ore fine ore refer generally to granularity be 0～8mm without ore grinding, sorting iron ore raw material, the consumption in this technology accounts for 70%～40% of all iron-bearing materials.
Still there are not any research of powdered iron ore composite agglomeration or the report of production at present both at home and abroad.
The present invention has following characteristics:
1) fully, rationally utilizes existing iron-bearing material
Adopt the present invention, with the fine concentrate of original sintering as the acid pellet raw materials for production, and with fine ore as alkaline agglomerate basic raw material, on a sinter machine, prepare the composite artificial lump ore of forming by acidic pellet ore and high basicity sinter simultaneously, make dissimilar iron ore raw materials obtain more rationally utilizing.
2) overcome in the fine concentrate sintering process bed permeability poor, be difficult to the agglomerating shortcoming
Adopt the present invention, allocate granule iron concentrate into an amount of binding agent and make ball separately, after being prepared into green-ball, again with other blended stock thorough mixing that constitutes by fine iron ore, flux etc., cloth, igniting, sintering, the raw materials for sintering of being made up of green-ball and granulation powder can improve the ventilation property of sinter bed greatly, significantly improves vertical sintering speed and utilization coefficient, has overcome the shortcoming that concentrate granulating efficiency difference in the conventional sintering technology causes the permeability of sintering material bed difference.
The shortcoming of existing charging segregation when 3) overcoming blast furnace and use agglomerate and pellet at the same time
Adopt the present invention, make in acidic pellet ore " embedding " the high basicity sinter matrix, form an integral body, fundamentally solved because blast furnace operating has been optimized in the segregation that both kinestates do not occur simultaneously.
4) significantly reduce sintering energy consumption, save the investment of founding the factory
Adopt the present invention, make that (800～900mm) become possibility to employing superelevation bed of material sintering technology.Because the improvement of bed permeability helps making full use of the auto accumulation heat effect of the bed of material, reduce the sintering solid energy consumption.And the significantly raising of productivity of sinter also can corresponding reduction SINTERING PRODUCTION energy consumption.In addition, this technology prepares high basicity sinter and acidic pellet ore simultaneously on sinter machine, to unconditionally building the iron and steel enterprise of chain grate-rotary kiln acid pellet factory or shaft furnace pelletizing plant in addition, can reduce investment outlay greatly.
Description of drawings
Fig. 1: process flow diagram of the present invention.
Embodiment
1. granule iron concentrate partly accounts for 35.5% in the sinter mixture, wherein adds 1.0% unslaked lime, is unworthy of refuel, makes ball in balling disc separately, and basicity keeps 0.6; Fine ore partly accounts for 64.5% in the compound, wherein allocates the unslaked lime of 5.0% coke powder and 4.38% into, and basicity is 3.2, carries out once mixing with secondary.The total alkalinity of control compound is 2.25.With green-ball and the secondary compound mixing for preparing, cloth in sintered cup, igniting, sintering.The sintering negative pressure is 7kPa, bed depth 700mm.The yield rate that can obtain agglomerate is 81.11%, and barrate strength is 63.52%, utilization coefficient 2.212t.m
-2.h
-1, vertical sintering speed 22.57mm/min.
2. granule iron concentrate partly accounts for 30% in the sinter mixture, wherein adds 1.0% coke powder, and not with addition of unslaked lime, basicity is 0.1, makes ball in balling disc separately; Fine ore partly accounts for 70% in the compound, wherein allocates the unslaked lime of 4.0% coke powder and 5.38% into, and basicity is 3.4, carries out once mixing with secondary.The total alkalinity of control material is 2.25.With green-ball and the secondary compound mixing for preparing, cloth in sintered cup, igniting, sintering.The sintering negative pressure is 8kPa, bed depth 600mm.The yield rate that can obtain agglomerate is 80.16%, and barrate strength is 61.07%, utilization coefficient 2.083t.m
-2.h
-1, vertical sintering speed 22.20mm/min.
3. granule iron concentrate partly accounts for 40% in the sinter mixture, adds 1.0% wilkinite, and basicity is 0.1, makes ball in balling disc separately; Fine ore partly accounts for 60% in the compound, wherein allocates the unslaked lime of 5.0% coke powder and 5.38% into, keeps basicity 3.4, carries out once mixing with secondary.The total alkalinity of control material is 2.25.With green-ball and the secondary compound mixing for preparing, cloth in sintered cup, igniting, sintering.The sintering negative pressure is 7kPa, bed depth 750mm.The yield rate that can obtain agglomerate is 78.51%, and barrate strength is 62.21%, utilization coefficient 1.985t.m
-2.h
-1, vertical sintering speed 21.79mm/min.
4. granule iron concentrate partly accounts for 50% in the sinter mixture, wherein adds 0.5% unslaked lime and 0.5% wilkinite, and not with addition of coke powder, basicity is 0.48, makes ball in balling disc separately; Fine ore partly accounts for 50% in the compound, wherein allocates the unslaked lime of 4.7% coke powder and 4.55% into, keeps basicity 2.90, carries out once mixing with secondary.The total alkalinity of control material is 2.0.With green-ball and the secondary compound mixing for preparing, cloth in sintered cup, igniting, sintering.The sintering negative pressure is 8kPa, bed depth 850mm.The yield rate that can obtain agglomerate is 80.38%, and barrate strength is 62.67%, utilization coefficient 1.747t.m
-2.h
-1, vertical sintering speed 18.35mm/min.
Claims (3)
1. composite agglomeration technology of iron powdered ore, it is characterized in that: will account for all iron-bearing material per-cents and be that 30～60% granule iron concentrate adds binding agent and fuel is prepared burden, mixing, compound is made diameter on balling disc be 8～16mm pelletizing, and fuel input accounts for all iron-bearing materials 0～1.5%; With accounting for all iron-bearing material per-cents is that 70～40% fine ore and other iron-bearing materials and flux and fuel are prepared burden, the flux add-on accounts for all iron-bearing materials 5.5～4.0%, fuel input accounts for all iron-bearing materials 5.0～3.5%, and by conventional sintering technology carry out once, the secondary combination treatment; With pelletizing and secondary compound mixing, carry out cloth, igniting, sintering on sinter machine then, whole grain gets complex sintered lump ore after cooling off; The sinter bed height is 500～900mm, igniting negative pressure 4～5kPa, ignition time 0.75～1min, sintering exhausting negative pressure 6～9kPa.
2. method according to claim 1 is characterized in that: described binding agent is wilkinite or unslaked lime, and its add-on accounts for all iron-bearing materials 0～1.5%.
3. method according to claim 1 is characterized in that: and described granule iron concentrate is general-and 0.074mm content is greater than 40%, and consumption accounts for 30%～60% of all iron-bearing materials; It is 0～8mm iron ore raw material that described iron ore fine ore refers generally to granularity, and consumption accounts for 70%～40% of all iron-bearing materials.
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| CNB2005100320956A CN100537794C (en) | 2005-09-01 | 2005-09-01 | Composite agglomeration technology of iron powdered ore |
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