CN104630452A - Sintering method for preparing boron ore powder - Google Patents
Sintering method for preparing boron ore powder Download PDFInfo
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- CN104630452A CN104630452A CN201510063844.5A CN201510063844A CN104630452A CN 104630452 A CN104630452 A CN 104630452A CN 201510063844 A CN201510063844 A CN 201510063844A CN 104630452 A CN104630452 A CN 104630452A
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Abstract
The invention discloses a sintering method for preparing boron ore powder. The sintering method comprises the following steps: carrying out fine grinding on ore powder, namely, adding an aqueous polymer which accounts for 3-5% of the weight of boron ore powder, furfural residues which accounts for 10-20% of the weight of boron ore powder, a gallic acid which accounts for 0.3-0.5% of the weight of boron ore powder, and coal ash which accounts for 10-20% of the weight of boron ore powder, and uniformly mixing and carrying out fine grinding; (2) preparing spherulite; (3) sintering, namely, coating the surface of spherulite with a layer of fuel, feeding the spherulite into a sintering machine, allocating materials, wherein the material layer height is 600-700mm, an atomization spraying device is adopted to add moisture to the sintered mixed material in the allocation procedure of the sintering machine, a small water allocation amount is adopted to middle and upper allocated materials in the upper mixed material layer of the sintering machine, the moisture is 5-6%, a large water allocation amount is adopted in the lower allocated material of the material layer, and the moisture is 7-8%, drying, preheating, igniting and sintering to prepare sintered ore, and cooling, crushing and screening sintered ore, thereby obtaining a finished product sintered ore of which the granularity is 10-20mm. The method for preparing boron ore powder is simple in process, by fine grinding and activating boron ore powder, the reaction temperature can be reduced, an average heating method is adopted in the sintering procedure, the strength and the yield of sintering ore can be improved, and the consumption of solid fuel can be reduced.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, particularly relate to a kind of sintering method preparing boron ore powder.
Background technology
Furnace charge refers to the ore and other catalytic materials that add smelting furnace, and iron ore, steel billet, the pig iron, iron and steel scrap, breeze, coking coal, iron alloy all belong to furnace charge.Boron ore powder is the one of furnace charge, prepare the method for boron ore powder at present, there is solid fuel consumption high, energy utilization rate is low, the problem that sinter strength is poor, yield poorly, in boron ore powder fine grinding operation, boron ore powder grindability is very poor, fine particle is the group of connecing easily, needs to consume a large amount of energy and production time in grinding process, and in sintering circuit, after bed of material surface ignition, along with the process of sintering, the heat that in compound, solid fuel ignition produces shifts from bed of material top lower portion, material layer temperature presents the trend progressively improved from top to bottom, the auto accumulation heat effect of fuel concentrated combustion and sintering ore bed, more down temperature is higher to make the bed of material, heat is more, thermal zone wider, therefore sintering process is an anisothermal process, and the quality of thickness to sintering process and quality product of top temperature travelling speed in sinter bed and zone of combustion has a great impact, after such as the bed of material thickens, solid fuel consumption reduces relatively, the sintering top bed of material causes sinter strength to be deteriorated because of shortage of heat, decrease in yield, finished product agglomerate heterogeneity, production system sinter return rate increases, worsen sintering process conditions etc.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of sintering method preparing boron ore powder is provided, processing method is simple, easy to operate, by fine grinding boron ore powder and activation boron ore powder, reduce its temperature of reaction, soaking method is adopted in sintering circuit, improve sinter strength and Sintering Yield, save solid fuel consumption, energy utilization rate is high.
The present invention adopts following technical scheme to achieve these goals:
Prepare a sintering method for boron ore powder, comprise the following steps:
(1) in drying machine, paigeite is added, drying is carried out through being dispersed as boron ore powder, then gas solid separation is carried out to the mixture of boron ore powder and air, the solid obtained, add the aqueous high molecular of solid weight 3-5%, the furfural dregs of 10-20%, the gallic acid of 0.3-0.5%, the flyash of 10-20%, mix, then carry out fine grinding to-0.07mm, specific surface area 1300-1400cm
2/ g;
(2) spherolite is prepared: the compound getting step (1) fine grinding, add the described caking agent of compound weight 1.5-1.8%, the fuel of 3.0-4.5%, Homogeneous phase mixing, add water-wet, control pelletizing moisture 8.0-8.5%, then by pelletizer pelletizing, spherolite Task-size Controlling is at 5-10mm;
(3) sinter: the pellet surface of step (2) gained is wrapped one deck fuel, load sinter machine, cloth, bed of material floor height is 600-700mm, use atomizing sprayer for sinter mixture is with addition of moisture in described sintering machine distributing operation, described atomizing sprayer comprises the multiple atomizers be arranged in sinter machine, atomizer is arranged on the different positions in cloth short transverse, atomizer is communicated with water source by water-supply line, water-supply line is provided with water control valve, on sinter machine in the compound bed of material, top cloth adopts little water distribution quantity, moisture is 5-6%, the lower part cloth of the bed of material adopts large water distribution quantity, moisture is 7-8%, sintering of lighting a fire after super-dry, preheating again makes heat sinter, and heat sinter, through overcooling, fragmentation and screening, obtains the finished product agglomerate that granularity is 10-20mm.
Furfural dregs described in step (1) take corn cob as the residue waste residue that raw material sulphuric acid method produces furfural.
Caking agent described in step (2) is prepared by following methods: take 3-5% rare earth element, 5-10% sodium-chlor, 5-10% sodium carbonate and excess water mixed dissolution by weight percentage and be mixed with medicament, medicament and montmorillonite powder mixing is taken again by weight 1:2.5-3.5, then slaking, oven dry, fine grinding.
Fuel described in step (2) is one or both in coke powder, hard coal.
In pelletizer balling process described in step (2), Balling time is 10-15min, and shatter strength of green pellet is greater than 4 times/0.5m, and ultimate compression strength is greater than 10N/, and burst temperature is higher than 300 DEG C.
Described in step (3), drying temperature is 400-450 DEG C, and dry negative pressure is 5-6KPa, and time of drying is 5-8min, and described ignition temperature is 1100-1200 DEG C, and igniting negative pressure is 5-6KPa.
Compared with the prior art, beneficial effect of the present invention is as follows:
(1) sintering method preparing boron ore powder of the present invention, processing method is simple, easy to operate, by fine grinding boron ore powder and activation boron ore powder, reduce its temperature of reaction, in sintering circuit, adopt soaking method, improve sinter strength and Sintering Yield, save solid fuel consumption.
(2) boron ore powder is first carried out fine grinding process by the present invention, with regard to boron rock fine fraction content and specific surface area, improve its balling property, green ball strength and thermostability is improved again by adding caking agent, divided by pellet forming process and fuel and add technique, improve the ventilation property of the bed of material on sinter machine, improve the combustion conditions of fuel, the advantage of pelletizing process and sintering process is combined, boron rock agglomerate is by solid phase consolidation and liquid phase is bonding combines, the consolidation in intensified-sintered ore deposit, therefore, sinter strength and output increase substantially, and energy consumption obviously reduces; And the caking agent selected has oxygenation, combustion-supporting, the function of improving ventilation property, prevents pellet from occurring quick-fried ball phenomenon in pyrotic smelting, improves sintering velocity simultaneously.
(3) the present invention adds the breeze additives such as aqueous high molecular, furfural dregs, gallic acid and flyash in the boron ore powder fine grinding stage, has significant grinding-aid effect, effectively excites breeze active, reduces its temperature of reaction.
(4) the present invention is in sintering circuit, by adopting uniform heating process, in stub bar, bottom, the uniform atomized water of surface sprinkling before roasting, improve the bulk density of compound in sinter bed, improve solid fuel and hot gas flow conduction efficiency, solve that material layer lower part auto accumulation heat temperature in deep bed sintering is too high, fuel and water dispenser ratio are difficult to uniform temperature in sintering top shortage of heat and the bed of material, make boron ore powder soaking, improve the seed output and quality of agglomerate, save solid fuel consumption.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but the present invention is not limited only to these embodiments, and under the prerequisite not departing from present inventive concept, any improvement done all drops within protection scope of the present invention.
Embodiment 1:
Prepare a sintering method for boron ore powder, comprise the following steps:
(1) in drying machine, paigeite is added, drying is carried out through being dispersed as boron ore powder, then gas solid separation is carried out to the mixture of boron ore powder and air, the solid obtained, add the aqueous high molecular of solid weight 3%, 20% furfural dregs, the gallic acid of 0.3%, the flyash of 10%, mix, then carry out fine grinding to-0.07mm, specific surface area 1300-1400cm
2/ g;
(2) prepare spherolite: the compound getting step (1) fine grinding, add the described caking agent of compound weight 1.5%, the coke powder of 3.0%, Homogeneous phase mixing, add water-wet, control pelletizing moisture 8.0%, then by pelletizer pelletizing, spherolite Task-size Controlling is at 10mm; Described caking agent is prepared by following methods: take 3% rare earth element, 10% sodium-chlor, 5% sodium carbonate and excess water mixed dissolution by weight percentage and be mixed with medicament, medicament and montmorillonite powder mixing is taken again by weight 1:2.5, then slaking, oven dry, fine grinding; In described pelletizer balling process, Balling time is 10-15min, and shatter strength of green pellet is greater than 4 times/0.5m, and ultimate compression strength is greater than 10N/, and burst temperature is higher than 300 DEG C.
(3) sinter: the pellet surface of step (2) gained is wrapped one deck fuel, load sinter machine, cloth, bed of material floor height is 600mm, use atomizing sprayer for sinter mixture is with addition of moisture in described sintering machine distributing operation, described atomizing sprayer comprises the multiple atomizers be arranged in sinter machine, atomizer is arranged on the different positions in cloth short transverse, atomizer is communicated with water source by water-supply line, water-supply line is provided with water control valve, on sinter machine in the compound bed of material, top cloth adopts little water distribution quantity, moisture is 5-6%, the lower part cloth of the bed of material adopts large water distribution quantity, moisture is 7-8%, sintering of lighting a fire after super-dry, preheating again makes heat sinter, and heat sinter, through overcooling, fragmentation and screening, obtains the finished product agglomerate that granularity is 10-20mm, described drying temperature is 400 DEG C, and dry negative pressure is 6KPa, and time of drying is 5min, and described ignition temperature is 1100 DEG C, and igniting negative pressure is 6KPa.
Embodiment 2:
Prepare a sintering method for boron ore powder, comprise the following steps:
(1) in drying machine, paigeite is added, drying is carried out through being dispersed as boron ore powder, then gas solid separation is carried out to the mixture of boron ore powder and air, the solid obtained, add the aqueous high molecular of solid weight 5%, 15% furfural dregs, the gallic acid of 0.5%, the flyash of 15%, mix, then carry out fine grinding to-0.07mm, specific surface area 1300-1400cm
2/ g; Described furfural dregs take corn cob as the residue waste residue that raw material sulphuric acid method produces furfural.
(2) prepare spherolite: the compound getting step (1) fine grinding, add the described caking agent of compound weight 1.6%, the hard coal of 3.5%, Homogeneous phase mixing, add water-wet, control pelletizing moisture 8.0-8.5%, then by pelletizer pelletizing, spherolite Task-size Controlling is at 5-10mm; Described caking agent is prepared by following methods: take 5% rare earth element, 8% sodium-chlor, 8% sodium carbonate and excess water mixed dissolution by weight percentage and be mixed with medicament, medicament and montmorillonite powder mixing is taken again by weight 1:3.0, then slaking, oven dry, fine grinding; In described pelletizer balling process, Balling time is 10-15min, and shatter strength of green pellet is greater than 4 times/0.5m, and ultimate compression strength is greater than 10N/, and burst temperature is higher than 300 DEG C.
(3) sinter: the pellet surface of step (2) gained is wrapped one deck fuel, load sinter machine, cloth, bed of material floor height is 700mm, use atomizing sprayer for sinter mixture is with addition of moisture in described sintering machine distributing operation, described atomizing sprayer comprises the multiple atomizers be arranged in sinter machine, atomizer is arranged on the different positions in cloth short transverse, atomizer is communicated with water source by water-supply line, water-supply line is provided with water control valve, on sinter machine in the compound bed of material, top cloth adopts little water distribution quantity, moisture is 5-6%, the lower part cloth of the bed of material adopts large water distribution quantity, moisture is 7-8%, sintering of lighting a fire after super-dry, preheating again makes heat sinter, and heat sinter, through overcooling, fragmentation and screening, obtains the finished product agglomerate that granularity is 10-20mm, described drying temperature is 450 DEG C, and dry negative pressure is 6KPa, and time of drying is 8min, and described ignition temperature is 1200 DEG C, igniting negative pressure 6KPa.
Claims (6)
1. prepare a sintering method for boron ore powder, it is characterized in that: comprise the following steps:
(1) in drying machine, paigeite is added, drying is carried out through being dispersed as boron ore powder, then gas solid separation is carried out to the mixture of boron ore powder and air, the solid obtained, add the aqueous high molecular of solid weight 3-5%, the furfural dregs of 10-20%, the gallic acid of 0.3-0.5%, the flyash of 10-20%, mix, then carry out fine grinding to-0.07mm, specific surface area 1300-1400cm
2/ g;
(2) spherolite is prepared: the compound getting step (1) fine grinding, add the described caking agent of compound weight 1.5-1.8%, the fuel of 3.0-4.5%, Homogeneous phase mixing, add water-wet, control pelletizing moisture 8.0-8.5%, then by pelletizer pelletizing, spherolite Task-size Controlling is at 5-10mm;
(3) sinter: the pellet surface of step (2) gained is wrapped one deck fuel, load sinter machine, cloth, bed of material floor height is 600-700mm, use atomizing sprayer for sinter mixture is with addition of moisture in described sintering machine distributing operation, described atomizing sprayer comprises the multiple atomizers be arranged in sinter machine, atomizer is arranged on the different positions in cloth short transverse, atomizer is communicated with water source by water-supply line, water-supply line is provided with water control valve, on sinter machine in the compound bed of material, top cloth adopts little water distribution quantity, moisture is 5-6%, the lower part cloth of the bed of material adopts large water distribution quantity, moisture is 7-8%, sintering of lighting a fire after super-dry, preheating again makes heat sinter, and heat sinter, through overcooling, fragmentation and screening, obtains the finished product agglomerate that granularity is 10-20mm.
2. the sintering method preparing boron ore powder according to claim 1, is characterized in that: the furfural dregs described in step (1) take corn cob as the residue waste residue that raw material sulphuric acid method produces furfural.
3. the sintering method preparing boron ore powder according to claim 1, it is characterized in that: the caking agent described in step (2) is prepared by following methods: take 3-5% rare earth element, 5-10% sodium-chlor, 5-10% sodium carbonate and excess water mixed dissolution by weight percentage and be mixed with medicament, medicament and montmorillonite powder mixing is taken again by weight 1:2.5-3.5, then slaking, oven dry, fine grinding.
4. the sintering method preparing boron ore powder according to claim 1, is characterized in that: the fuel described in step (2) is one or both in coke powder, hard coal.
5. the sintering method preparing boron ore powder according to claim 1, it is characterized in that: in the pelletizer balling process described in step (2), Balling time is 10-15min, and shatter strength of green pellet is greater than 4 times/0.5m, ultimate compression strength is greater than 10N/, and burst temperature is higher than 300 DEG C.
6. the sintering method preparing boron ore powder according to claim 1, it is characterized in that: described in step (3), drying temperature is 400-450 DEG C, dry negative pressure is 5-6KPa, and time of drying is 5-8min, described ignition temperature is 1100-1200 DEG C, and igniting negative pressure is 5-6KPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603179A (en) * | 2016-01-13 | 2016-05-25 | 铜陵百荣新型材料铸件有限公司 | Process for granulating, shaping and sintering phosphate powder |
| CN105714105A (en) * | 2016-02-26 | 2016-06-29 | 铜陵安东铸钢有限责任公司 | High-temperature sintering technology for nickel mineral powder |
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| CN102965077A (en) * | 2012-11-23 | 2013-03-13 | 东南大学 | Powdered ore additive |
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2015
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Patent Citations (6)
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| CN101157977A (en) * | 2007-11-27 | 2008-04-09 | 北京科技大学 | Concentration method for iron and boron in low-grade paigeite |
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| CN101705356A (en) * | 2009-12-07 | 2010-05-12 | 中南大学 | Sintering technology of ferrochrome mineral powder |
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