CN103834799A - Method for increasing yield of sintering ore by utilizing siderite - Google Patents
Method for increasing yield of sintering ore by utilizing siderite Download PDFInfo
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- CN103834799A CN103834799A CN201410078661.6A CN201410078661A CN103834799A CN 103834799 A CN103834799 A CN 103834799A CN 201410078661 A CN201410078661 A CN 201410078661A CN 103834799 A CN103834799 A CN 103834799A
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Abstract
The invention discloses a method for increasing yield of sintering ore by utilizing siderite. The method comprises the following steps: crushing the siderite into particles with particle size of 16 to 25mm; completely or partially replacing the finished sintering ore serving as a bedding material by the particles; distributing materials; igniting; sintering; and then oxidizing and roasting the siderite with the high-temperature smoke produced by the sintering. With the adoption of the method, the problem that the finished sintering ore is used as the bedding material can be avoided, and the sintering ore output can be effectively increased; in addition, the siderite can be roasted, and thus the incremental and synergistic utilization of the siderite can be realized; moreover, the output of sintering desulfurization equipment can be increased; relatively high economic benefit is brought.
Description
Technical field
The invention belongs to agglomerate preparing technical field, more particularly, relate to a kind of method of utilizing spathic iron ore to improve Sintering Yield.
Background technology
Spathic iron ore is the ore that contains iron carbonate, and its major ingredient is FeCO
3, present Steel Gray.This ore contains quite high calcium salt and magnesium salts mostly, in the time that the impurity in spathic iron ore is few, can be used as iron ore and refine iron, but emit carbonic acid gas because carbonate can absorb a large amount of heat when approximately 800～900 ℃ of the high temperature, therefore conventionally first this class ore is utilized after roasting more in addition.
A kind of spathic iron ore sulphur content high (1～3wt%) of Panxi Diqu, TFe content are about 35wt% left and right, SiO
2content reaches 30wt% left and right, and its scaling loss value is about 25wt% left and right, and its price is lower.If remove its scaling loss value, the TFe content of this spathic iron ore can reach 47wt%.But just because of the sulphur content of this spathic iron ore and scaling loss is higher and its sintering character is poor, although therefore its price is lower, but still cannot use in a large number, cause the serious waste of resource.
Summary of the invention
For deficiency of the prior art, the object of the invention is to solve one or more in above technical problem.
The object of the present invention is to provide a kind of method of utilizing spathic iron ore to improve Sintering Yield, improve Sintering Yield at effective roasting spathic iron ore and in improving its utilization ratio.
To achieve these goals, the invention provides a kind of method of utilizing spathic iron ore to improve Sintering Yield, spathic iron ore fragmentation is become to the pellet that particle diameter is 16～25mm, finished product agglomerate using all or part of described pellet replacement as grate-layer material, carry out afterwards cloth, igniting and sintering, the high-temperature flue gas that utilizes sintering to produce carries out oxidizing roasting processing to spathic iron ore.
According to an embodiment who utilizes spathic iron ore to improve the method for Sintering Yield of the present invention, by weight percentage, the TFe content in described spathic iron ore is 30～40%, and the scaling loss value of described spathic iron ore is 20～30%.
According to an embodiment who utilizes spathic iron ore to improve the method for Sintering Yield of the present invention, by weight percentage, the TFe content in described spathic iron ore is 35%, and the scaling loss value of described spathic iron ore is 25%.
According to an embodiment who utilizes spathic iron ore to improve the method for Sintering Yield of the present invention, by weight percentage, the amount of the described finished product agglomerate as grate-layer material accounts for 2～8% of finished product Sintering Yield.
According to an embodiment who utilizes spathic iron ore to improve the method for Sintering Yield of the present invention, described agglomerate is high-Ti type V-Ti agglomerate.
According to an embodiment who utilizes spathic iron ore to improve the method for Sintering Yield of the present invention, control the temperature of sinter machine bottom lower than 600 ℃.
According to an embodiment who utilizes spathic iron ore to improve the method for Sintering Yield of the present invention, the dosage of coke in raw materials for sintering is controlled to 4.5～4.8wt%.
After adopting method of the present invention, not only can avoid using finished product agglomerate as grate-layer material, effectively improve Sintering Yield, and can roasting spathic iron ore, and can improve the output of sintering desulfuration equipment, there is larger economic benefit.
Embodiment
Hereinafter, the method for utilizing spathic iron ore to improve Sintering Yield to exemplary embodiment of the present is described.Unless otherwise noted, in this specification sheets, related content all refers to weight percent content.
According to the present invention, the described method of utilizing spathic iron ore to improve Sintering Yield specifically comprises the following steps: spathic iron ore fragmentation is become to the pellet that particle diameter is 16～25mm, finished product agglomerate using all or part of described pellet replacement as grate-layer material, carry out afterwards cloth, igniting and sintering, the high-temperature flue gas that utilizes sintering to produce carries out oxidizing roasting processing to spathic iron ore.
Particularly, one aspect of the present invention utilizes spathic iron ore partly or entirely to replace the finished product agglomerate as grate-layer material, has reduced agglomerate returning charge, has improved yield rate; Utilize on the other hand the waste heat of sintering to realize heated oxide roasting to spathic iron ore, impel FeCO wherein
3and sulfide decomposes under cold condition, improve the quality of burning residual thing.Due to the finished product agglomerate that all to adopt part granularity in sintering process be 10～16mm sieve out return to sinter machine and be laid on raw material bottom to improve ventilation property, but consider after spathic iron ore oxidizing roasting is decomposed and may cause part efflorescence, so needed to be crushed to the particle diameter that requires of 16～25mm before utilizing spathic iron ore, the setting of this preferred particle diameter is to consider and determine according to experiment with reference to the intensity after granularity requirements and the roasting of grate-layer material.
Wherein, the main component of spathic iron ore is FeCO
3, and FeCO
3decomposes reaction formula in air and under the temperature of reaction of 400～560 ℃ is as follows:
4FeCO
3+O
2=2Fe
2O
3+4CO
2↑
But utilize spathic iron ore to replace grate-layer material to carry out sintering and also may produce some problems, the first may have the Powdered resolvent of part and be bonded in the bottom of sinter machine, it two is that sulphur content in sinter fume may rise, but all sinter machines are all furnished with flue gas desulfurization (FGD) unit at present, therefore this impact is little, it three is may cause certain influence to the homogeneity of whole sintered material, but by controlling material basicity well, its impact also can become very little.Wherein, in order to prevent the rear bonding of spathic iron ore fusing sinter machine castor bar, can be by the temperature control bottom sinter machine for to avoid lower than 600 ℃.Generally, the temperature of sinter machine bottom is to control according to the mixed carbon comtent in raw materials for sintering, according to the present invention, the proportioning of coke powder is controlled to 4.5～4.8wt% and can makes the temperature of sinter machine bottom lower than 600 ℃.
Spathic iron ore after roasting enters blast furnace with finished product agglomerate and smelts, and can be used for substituting the lump ore that blast furnace is used.And this baked spathic iron ore than not baked spathic iron ore directly enter blast furnace use more energy-conservation, because it consumes metallurgical coke still less, therefore in increase spathic iron ore usage quantity and utilization ratio, reduced energy expenditure.
By weight percentage, in spathic iron ore of the present invention, TFe content is 30～40%, and its scaling loss value is 20～30%.Preferably, TFe content is 35%, and scaling loss value is 25%.Utilize the spathic iron ore of above grade condition both economical, because the ore resource amount under this condition is larger, and utilization ratio is high.If TFe content is too low, it is worth not quite, if scaling loss value is too high, decomposes needed heat many, when sintering, can increase fuel consumption.
Wherein, amount as the finished product agglomerate of grate-layer material accounts for 2～8% of finished product Sintering Yield, can the spathic iron ore pellet after above-mentioned fragmentation be replaced to all or part of of this grate-layer material according to actual condition, the benefit that the substitution ratio of spathic iron ore can bring according to raising Sintering Yield decides, for example, substituting 50% above benefit can be better, preferably carries out replacing whole.According to one embodiment of present invention, described agglomerate is high-Ti type V-Ti agglomerate, but the invention is not restricted to this.
Wherein, can be according to the performance of the sintering basic characteristic of sintering iron-bearing material (melting, same to voltinism), gangue kind and quantity, ore structure, granularity, agglomerate, sintering iron-bearing material is suitably selected and proportioning, and the present invention does not specifically limit raw materials for sintering.
Because proportioning and the sintering parameter of agglomerate all do not change, therefore adopt spathic iron ore to replace after hearth layer for sintering, the performance of gained agglomerate is substantially constant.
Further illustrate the method for utilizing spathic iron ore to improve Sintering Yield of the present invention below in conjunction with concrete example.
Table 1 shows raw materials for sintering and the proportioning thereof in benchmark example and example 1,2.
Table 1 raw materials for sintering and proportioning thereof (wt%)
From table 1, the raw materials for sintering in benchmark example and example 1,2 specifically comprises Baima V-ti-bearing Magnetite Concentrate, the common fine ore of domestic higher-grade, low-grade common fine ore and flux (unslaked lime, Wingdale), fuel (coke powder), the breeze etc. of returning mine.
In the proportioning process of above-mentioned raw materials, the outer method of joining is taked in return mine breeze and grate-layer material, according to 25% and finished product ore deposit of dry powder gross weight 5.5% additionally with addition of.
In actual production, only the total weight percent of the iron charge that comprises higher-grade v-ti magnetite concentrate, the common fine ore of higher-grade and low-grade common fine ore is fixed as to 80%, the ratio of rest materials is unfixing, can require to do suitable adjustment according to producing Sinter Component.
Wherein, above-mentioned raw materials used main physical and chemical indexes is (ratio of each composition is all weight percentage):
Baima V-ti-bearing Magnetite Concentrate: ω (TFe) 55.5～57.0%, ω (SiO
2) >3.0%, ω (FeO) >30%, ω (TiO
2) >10%, ω (granularity <0.074mm) >70%;
The common fine ore of domestic higher-grade: ω (TFe) 58～62%, ω (SiO
2) 6～9%, ω (Al
2o
3) <3%, ω (TiO
2) <0.5%;
Low-grade common fine ore: ω (TFe) 40～49%, ω (SiO
2) 17～25%, ω (Al
2o
3) <6%, ω (TiO
2) <0.5%;
Dedusting ash: ω (TFe) 35～50%, ω (SiO
2) 6～8%, ω (Al
2o
3) <4%, ω (TiO
2) <5%;
Active ash: ω (CaO) 85～90%;
Wingdale: ω (main component CaO) 50～53%, ω (granularity <3mm)=100%;
Coke powder: ash content 12～15%, ω (granularity <3mm)=100%;
Breeze: the ω (TFe) 50% that returns mine, ω (SiO
2) 5.0～5.5%, ω (CaO) 10.0～11.0%, ω (granularity <5mm)=100%.
According to the proportioning ratio shown in table 1, by higher-grade v-ti magnetite concentrate, the common breeze of higher-grade, low-grade common fine ore, active ash, Wingdale, dedusting ash, coke powder, return mine after allocating blending bunker into adds water and mix in mixer.In mixing process, the moisture of controlling in compound is 7.4～7.8%, and mixing time is 5～6min.Before the compound mixing is put into sintered cup, by the finished product agglomerate 3.0kg(of the 10～16mm having sieved account for finished product agglomerate 5.5%) be layered on sintered cup bottom, then compound is packed into the down draft sintering of lighting a fire in sintered cup.Wherein, the diameter of sintered cup is 300mm, highly for 800mm, and in sintered cup, the granularity of grate-layer material is that 10～16mm, thickness are 20mm, and bed thickness is that 650～750mm(is containing grate-layer material thickness).
When sintering, ignition temperature is 1100～1150 ℃, and be 2.0～2.5min ignition time, and igniting negative pressure is 5.5～6kPa, and sintering suction pressure is 11.5～12.5kPa, and exhausting flow is 5～15m
3/ min, can be by regulating the sintering velocity of the parameter control compounds such as sintering suction pressure, exhausting flow.According in sintering operation process of the present invention: FeO content range is controlled to 7.0-10wt%, and vertical sintering speed is controlled at 17～20mm/min, and bed thickness is controlled at 650-750mm, sintering temperature is controlled at 1250～1300 ℃.Bottom sintered discharge gas temperature control is lower than 600 ℃, wherein, operates in sintering process, can also be by regulating bed thickness to control sinter machine bottom temp in the situation that sintering dosage of coke is certain, the bed of material is thicker, and sintering heat-accumulating and-keeping effect is better, and temperature is higher.
In sintering process, in the time that the spent air temperture of sintered cup lower end air draft pipe rises to the highest (lower than 600 ℃) and drops to 300 ℃ again, sintering process finishes.Sinter cake is poured out and carried out just broken (spacing of crusher is 50mm), after carrying out again falling for 3 times processing (height of fall is 2m), sieve respectively by 40～25mm, 25～16mm, 16～10mm, 10～5mm, <5mm, finally calculate the shared ratio of agglomerate that granularity is greater than 5mm, and according to GB GB3209 canonical measure sintered ore rotary drum strength.
For the ease of the technique effect of contrast and understanding example of the present invention, lower mask body has provided sintering experiment and the result of benchmark example and example 1,2.
benchmark example
Baima V-ti-bearing Magnetite Concentrate proportioning is 64%, the common fine ore proportioning of domestic higher-grade is 11%, domestic low-grade common fine ore proportioning is 5%, active grey proportioning is 4.5%, Wingdale proportioning is 6.5%, dosage of coke is 4.8%, dedusting ash proportioning is 4%, the breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in agglomerate
2ratio) control be 1.85 ± 0.05, quicklime slaking water ratio is 2:1, sintered mixture moisture is 7.4 ± 0.1%, grate-layer material amount 3.0kg, bed depth is 700mm, charge amount is 80kg.
Sintering result shows, 580 ℃ of sintered discharge gas temperature, and the amount of burning till of compound is 66kg, the agglomerate amount that granularity is greater than 5mm is 55kg, the 3.0kg of deduction grate-layer material, sintering finished rate is 78.78%.
example 1
Baima V-ti-bearing Magnetite Concentrate proportioning is 64%, the common fine ore proportioning of domestic higher-grade is 11%, domestic low-grade common fine ore proportioning is 5%, active grey proportioning is 4.5%, Wingdale proportioning is 6.5%, dosage of coke is 4.8%, dedusting ash proportioning is 4%, the breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in agglomerate
2ratio) control be 1.85 ± 0.05, quicklime slaking water ratio is 2:1, sintered mixture moisture is 7.4 ± 0.1%, grate-layer material amount is 3.0kg, grate-layer material comprises the finished product agglomerate of 1.5kg and the broken spathic iron ore of 1.5kg (particle diameter is 16～25mm), bed depth is 700mm, and charge amount is 80kg.
Result shows, the amount of burning till of compound is 65.63kg, and the agglomerate amount that granularity is greater than 5mm is 54.63kg, the 1.5kg of deduction grate-layer material, and sintering finished rate is 80.95%, yield rate is compared with 2.17 percentage points of the routine improves of benchmark.
example 2
Baima V-ti-bearing Magnetite Concentrate proportioning is 64%, the common fine ore proportioning of domestic higher-grade is 11%, domestic low-grade common fine ore proportioning is 5%, active grey proportioning is 4.5%, Wingdale proportioning is 6.5%, dosage of coke is 4.8%, dedusting ash proportioning is 4%, the breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in agglomerate
2ratio) control be 1.85 ± 0.05, quicklime slaking water ratio is 2:1, sintered mixture moisture is 7.4 ± 0.1%, grate-layer material amount 3.0kg, grate-layer material comprises the broken spathic iron ore (particle diameter is 16～25mm) of 3.0kg, and bed depth is 700mm, and charge amount is 80kg.
Result shows, the amount of burning till of compound is 65.25kg, and the agglomerate amount that granularity is greater than 5mm is 54.25kg, and sintering finished rate is 83.14%, and yield rate is compared with 4.36 percentage points of the routine improves of benchmark.
The tooling cost of ton agglomerate is about 80 yuan/t, and the price of spathic iron ore is 160 yuan/t, and the lump ore price that TFe is 47% is 450 yuan/t, estimates to substitute 2 percentage points of hearth layer for sintering with spathic iron ore, can improve the Sintering Yield of 2 percentage points, 360m
2sinter machine year is produced approximately more than 360 ten thousand tons, agglomerate, expectation can be saved approximately more than 800 ten thousand yuan/year of tooling cost and yield increase effects, improved the TFe grade of spathic iron ore simultaneously, thereby improve its cost performance, its value can increase by 200 yuan/t, year treatment capacity can reach 70,000 tons, makes spathic iron ore increment reach more than 1,000 ten thousand yuan/year, and both add up to benefit to estimate to reach more than 2,000 ten thousand yuan/year.
In sum, the present invention not only can utilize sintering waste heat to carry out roasting spathic iron ore, utilizes this spathic iron ore to substitute hearth layer for sintering simultaneously, in improving Sintering Yield, can also improve the output of sintering desulfuration equipment, has larger economic benefit.
The invention is not restricted to above-described embodiment, without departing from the present invention, can carry out various changes and modifications.
Claims (7)
1. a method of utilizing spathic iron ore to improve Sintering Yield, it is characterized in that, spathic iron ore fragmentation is become to the pellet that particle diameter is 16～25mm, finished product agglomerate using all or part of described pellet replacement as grate-layer material, carry out afterwards cloth, igniting and sintering, the high-temperature flue gas that utilizes sintering to produce carries out oxidizing roasting processing to spathic iron ore.
2. the method for utilizing spathic iron ore to improve Sintering Yield according to claim 1, is characterized in that, by weight percentage, the TFe content in described spathic iron ore is 30～40%, and the scaling loss value of described spathic iron ore is 20～30%.
3. the method for utilizing spathic iron ore to improve Sintering Yield according to claim 2, is characterized in that, by weight percentage, the TFe content in described spathic iron ore is 35%, and the scaling loss value of described spathic iron ore is 25%.
4. the method for utilizing spathic iron ore to improve Sintering Yield according to claim 1, is characterized in that, by weight percentage, the amount of the described finished product agglomerate as grate-layer material accounts for 2～8% of finished product Sintering Yield.
5. the method for utilizing spathic iron ore to improve Sintering Yield according to claim 1, is characterized in that, described agglomerate is high-Ti type V-Ti agglomerate.
6. the method for utilizing spathic iron ore to improve Sintering Yield according to claim 1, is characterized in that, controls the temperature of sinter machine bottom lower than 600 ℃.
7. the method for utilizing spathic iron ore to improve Sintering Yield according to claim 6, is characterized in that, the dosage of coke in raw materials for sintering is controlled to 4.5～4.8wt%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425008A (en) * | 2018-06-21 | 2018-08-21 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of classification cloth sintering method of siderite |
| CN111850197A (en) * | 2020-07-07 | 2020-10-30 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN115094233A (en) * | 2022-05-26 | 2022-09-23 | 抚顺新钢铁有限责任公司 | Method for efficiently utilizing full-size grade of iron selamestron |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04259339A (en) * | 1991-02-08 | 1992-09-14 | Sumitomo Metal Ind Ltd | Production of sintered ore |
| CN101413057A (en) * | 2008-03-05 | 2009-04-22 | 中南大学 | Method for efficiently separating low-ore grade and complicated iron ore |
| CN103343217A (en) * | 2013-06-25 | 2013-10-09 | 新疆昌平矿业有限责任公司 | Siderite roasting and dry sorting method |
-
2014
- 2014-03-05 CN CN201410078661.6A patent/CN103834799B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04259339A (en) * | 1991-02-08 | 1992-09-14 | Sumitomo Metal Ind Ltd | Production of sintered ore |
| CN101413057A (en) * | 2008-03-05 | 2009-04-22 | 中南大学 | Method for efficiently separating low-ore grade and complicated iron ore |
| CN103343217A (en) * | 2013-06-25 | 2013-10-09 | 新疆昌平矿业有限责任公司 | Siderite roasting and dry sorting method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425008A (en) * | 2018-06-21 | 2018-08-21 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of classification cloth sintering method of siderite |
| CN108425008B (en) * | 2018-06-21 | 2019-12-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of classification cloth sintering method of siderite |
| CN111850197A (en) * | 2020-07-07 | 2020-10-30 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN111850197B (en) * | 2020-07-07 | 2022-02-15 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN115094233A (en) * | 2022-05-26 | 2022-09-23 | 抚顺新钢铁有限责任公司 | Method for efficiently utilizing full-size grade of iron selamestron |
| CN115094233B (en) * | 2022-05-26 | 2023-12-15 | 抚顺新钢铁有限责任公司 | Method for full-grain-level efficient utilization of sorafenib |
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