CN103834799B - A kind of method utilizing spathic iron ore to improve Sintering Yield - Google Patents
A kind of method utilizing spathic iron ore to improve Sintering Yield Download PDFInfo
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- CN103834799B CN103834799B CN201410078661.6A CN201410078661A CN103834799B CN 103834799 B CN103834799 B CN 103834799B CN 201410078661 A CN201410078661 A CN 201410078661A CN 103834799 B CN103834799 B CN 103834799B
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Abstract
The invention discloses a kind of method utilizing spathic iron ore to improve Sintering Yield, spathic iron ore fragmentation is become the pellet that particle diameter is 16 ~ 25mm, using the finished product agglomerate of all or part of for described pellet replacement as grate-layer material, carry out cloth, igniting and sintering afterwards, the high-temperature flue gas utilizing sintering to produce carries out oxidizing roasting process to spathic iron ore.Not only can avoid after adopting method of the present invention using finished product agglomerate as grate-layer material, effectively improve Sintering Yield, and can roasting spathic iron ore, realize the increment of spathic iron ore, synergy utilizes, and the output of sintering desulfuration equipment can be improved, there is larger economic benefit.
Description
Technical field
The invention belongs to agglomerate preparing technical field, more particularly, relate to a kind of method utilizing spathic iron ore to improve Sintering Yield.
Background technology
Spathic iron ore is the ore containing iron carbonate, and its major ingredient is FeCO
3, present Steel Gray.This ore is mostly containing quite high calcium salt and magnesium salts, iron can be refined as iron ore when the impurity in spathic iron ore is few, but release carbonic acid gas because carbonate can absorb a large amount of heat when high temperature about 800 ~ 900 DEG C, therefore usually first utilize again after this class ore in addition roasting.
A kind of spathic iron ore sulphur content high (1 ~ 3wt%) of Panxi Diqu, TFe content are about about 35wt%, SiO
2content reaches about 30wt%, and its scaling loss value is about about 25wt%, and its price is lower.If remove its scaling loss value, then the TFe content of this spathic iron ore can reach 47wt%.But just because of this spathic iron ore sulphur content 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, what the object of the invention is to solve in above technical problem is one or more.
The object of the present invention is to provide a kind of spathic iron ore that utilizes to improve the method for Sintering Yield, improve Sintering Yield at effective roasting spathic iron ore while improving its utilization ratio.
To achieve these goals, the invention provides a kind of method utilizing spathic iron ore to improve Sintering Yield, spathic iron ore fragmentation is become the pellet that particle diameter is 16 ~ 25mm, using the finished product agglomerate of all or part of for described pellet replacement as grate-layer material, carry out cloth, igniting and sintering afterwards, the high-temperature flue gas utilizing sintering to produce carries out oxidizing roasting process to spathic iron ore.
According to the embodiment utilizing 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 the embodiment utilizing 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 the embodiment utilizing 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 the embodiment utilizing 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 the embodiment utilizing spathic iron ore to improve the method for Sintering Yield of the present invention, the temperature bottom control sinter machine is lower than 600 DEG C.
According to the embodiment utilizing 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 at 4.5 ~ 4.8wt%.
Not only can avoid after adopting method of the present invention using finished product agglomerate as grate-layer material, effectively improve Sintering Yield, and can roasting spathic iron ore, and the output of sintering desulfuration equipment can be improved, there is larger economic benefit.
Embodiment
Hereinafter, be described to the method utilizing spathic iron ore to improve Sintering Yield of exemplary embodiment of the present.Unless otherwise noted, involved in this specification sheets content all refers to weight percent content.
According to the present invention, the described method utilizing spathic iron ore to improve Sintering Yield specifically comprises the following steps: spathic iron ore fragmentation is become the pellet that particle diameter is 16 ~ 25mm, using the finished product agglomerate of all or part of for described pellet replacement as grate-layer material, carry out cloth, igniting and sintering afterwards, the high-temperature flue gas utilizing sintering to produce carries out oxidizing roasting process to spathic iron ore.
Particularly, one aspect of the present invention utilizes spathic iron ore partly or entirely to replace finished product agglomerate as grate-layer material, decreases agglomerate returning charge, improves yield rate; Utilize the waste heat of sintering to realize heated oxide roasting to spathic iron ore on the other hand, impel FeCO wherein
3and sulfide decomposes under cryogenic, improve the quality of burning debris getting.Due to all adopt part granularity in sintering process be the finished product agglomerate of 10 ~ 16mm sieve out return sinter machine and the bottom being laid on raw material to improve ventilation property, but consider that spathic iron ore oxidizing roasting may cause part efflorescence after decomposing, so needed the requirement particle diameter being crushed to 16 ~ 25mm before utilizing spathic iron ore, the setting of this preferred particle diameter be with reference to the granularity requirements of grate-layer material and roasting after intensity consider and experimentally determine.
Wherein, the main component of spathic iron ore is FeCO
3, and FeCO
3decomposes reaction formula in atmosphere and under the temperature of reaction of 400 ~ 560 DEG C 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 bottom that amount of powder shape resolvent is bonded in sinter machine, it two is that sulphur content in sinter fume may rise, but sinter machines all at present is all furnished with flue gas desulfurization (FGD) unit, 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, bonding sinter machine castor bar after melting to prevent spathic iron ore, can by controlling the temperature bottom sinter machine as to avoid lower than 600 DEG C.Generally, the temperature bottom sinter machine controls according to the mixed carbon comtent in raw materials for sintering, according to the present invention, temperature bottom sinter machine can be made lower than 600 DEG C the burden control of coke powder at 4.5 ~ 4.8wt%.
Spathic iron ore after roasting enters blast furnace with finished product agglomerate and smelts, and can be used for the lump ore of alternative blast furnace.And this baked spathic iron ore directly enters blast furnace than not baked spathic iron ore to be used more energy-conservation, because it consumes less metallurgical coke, therefore while increase spathic iron ore usage quantity and utilization ratio, reduces 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 comparatively large, and utilization ratio is high.If TFe content is too low, then it is worth little, if scaling loss value is too high, then decomposes required heat many, can increase fuel consumption during sintering.
Wherein, amount as the finished product agglomerate of grate-layer material accounts for 2 ~ 8% of finished product Sintering Yield, according to actual condition, the spathic iron ore pellet after above-mentioned fragmentation can be replaced all or part of of this grate-layer material, the benefit that the substitution ratio of spathic iron ore can bring according to raising Sintering Yield decides, such as, substituting more than 50% 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 present invention is not limited thereto.
Wherein, can according to the performance of the sintering basic characteristic (melting, anabolic) of sintering iron-bearing material, gangue kind and quantity, ore structures, granularity, agglomerate, suitably select and proportioning sintering iron-bearing material, the present invention does not specifically limit raw materials for sintering.
Because the proportioning of agglomerate and sintering parameter all do not change, after therefore adopting spathic iron ore to replace hearth layer for sintering, the performance of gained agglomerate is substantially constant.
The method utilizing spathic iron ore to improve Sintering Yield of the present invention is further illustrated below in conjunction with concrete example.
Table 1 show benchmark example and example 1,2 in raw materials for sintering and proportioning.
Table 1 raw materials for sintering and proportioning (wt%) thereof
From table 1, benchmark example and example 1,2 in raw materials for sintering specifically comprise 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), breeze etc. of returning mine.
In the proportioning process of above-mentioned raw materials, return mine breeze and grate-layer material are taked to join method outward, namely according to dry powder gross weight 25% and finished product ore deposit 5.5% additionally with addition of.
In actual production, only the total weight percent of the iron charge comprising higher-grade v-ti magnetite concentrate, the common fine ore of higher-grade and low-grade common fine ore is fixed as 80%, the ratio of rest materials is not fixed, and can require to do suitable adjustment according to production 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%;
Return mine breeze: ω (TFe) 50%, ω (SiO
2) 5.0 ~ 5.5%, ω (CaO) 10.0 ~ 11.0%, ω (granularity <5mm)=100%.
According to the 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 allocate blending bunker into after add water in mixer and mix.In mixing process, the moisture controlled in compound is 7.4 ~ 7.8%, and mixing time is 5 ~ 6min.Before the compound mixed is put into sintered cup, the finished product agglomerate 3.0kg(of the 10 ~ 16mm sieved is accounted for 5.5% of finished product agglomerate) be layered on bottom sintered cup, then compound is loaded in sintered cup and carry out igniting down draft sintering.Wherein, the diameter of sintered cup is 300mm, is highly 800mm, and the granularity of grate-layer material in sintered cup is 10 ~ 16mm, thickness is 20mm, and bed thickness is that 650 ~ 750mm(is containing grate-layer material thickness).
During sintering, ignition temperature is 1100 ~ 1150 DEG C, and ignition time is 2.0 ~ 2.5min, 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, by regulating the sintering velocity of state modulator compound such as sintering suction pressure, exhausting flow etc.According in sintering operation process of the present invention: control at 7.0-10wt% by FeO content range, vertical sintering speed controls at 17 ~ 20mm/min, and bed thickness controls at 650-750mm, and sintering temperature controls at 1250 ~ 1300 DEG C.Bottom frit spent air temperture controls to be lower than 600 DEG C, wherein, operates in sintering process, can also when sintering dosage of coke and being certain by regulating bed thickness to control sinter machine bottom temp, the bed of material is thicker, and sintering heat-accumulating and-keeping effect is better, then temperature is higher.
In sintering process, when the spent air temperture of sintered cup lower end air draft pipe rise to the highest (lower than 600 DEG C) drop to 300 DEG C again time, sintering process terminates.Sinter cake is poured out and carries out just broken (spacing of crusher is 50mm), sieve respectively by 40 ~ 25mm, 25 ~ 16mm, 16 ~ 10mm, 10 ~ 5mm, <5mm after carrying out falling process (height of fall is 2m) for 3 times again, finally calculate the ratio shared by agglomerate that granularity is greater than 5mm, and according to GB GB3209 canonical measure sintered ore rotary drum strength.
For the ease of contrast and the technique effect understanding example of the present invention, show in particular sintering experiment and the result of benchmark example and example 1,2 below.
benchmark example
Baima V-ti-bearing Magnetite Concentrate proportioning is 64%, domestic higher-grade common fine ore proportioning 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%, breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in agglomerate
2ratio) control to be 1.85 ± 0.05, quicklime slaking water ratio is 2:1, and sintered mixture moisture is 7.4 ± 0.1%, shop fixtures doses 3.0kg, and bed depth is 700mm, and charge amount is 80kg.
Sintering result shows, sintered discharge gas temperature 580 DEG C, and the amount of burning till of compound is 66kg, and the agglomerate amount that granularity is greater than 5mm is 55kg, and 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%, domestic higher-grade common fine ore proportioning 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%, breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in agglomerate
2ratio) control to be 1.85 ± 0.05, quicklime slaking water ratio is 2:1, sintered mixture moisture is 7.4 ± 0.1%, shop fixtures doses is 3.0kg, grate-layer material comprises the finished product agglomerate of 1.5kg and the broken spathic iron ore (particle diameter is 16 ~ 25mm) of 1.5kg, 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%, and yield rate comparatively benchmark example improves 2.17 percentage points.
example 2
Baima V-ti-bearing Magnetite Concentrate proportioning is 64%, domestic higher-grade common fine ore proportioning 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%, breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in agglomerate
2ratio) control to be 1.85 ± 0.05, quicklime slaking water ratio is 2:1, and sintered mixture moisture is 7.4 ± 0.1%, shop fixtures doses 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 comparatively benchmark example improves 4.36 percentage points.
The tooling cost of ton agglomerate is about 80 yuan/t, the price of spathic iron ore is 160 yuan/t, TFe be 47% lump ore price be 450 yuan/t, estimate to substitute hearth layer for sintering 2 percentage points with spathic iron ore, then can improve the Sintering Yield of 2 percentage points, 360m
2sinter machine year produces about more than 360 ten thousand tons, agglomerate, expectation can save tooling cost and yield increase effect about more than 800 ten thousand yuan/year, improve the TFe grade of spathic iron ore simultaneously, thus improve its cost performance, its value can increase by 200 yuan/t, year, treatment capacity can reach 70,000 tons, and spathic iron ore is rised in value and reaches more than 1,000 ten thousand yuan/year, 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, while raising Sintering Yield, can also improve the output of sintering desulfuration equipment, have larger economic benefit.
The invention is not restricted to above-described embodiment, without departing from the present invention, can various changes and modifications be carried out.
Claims (6)
1. the method utilizing spathic iron ore to improve Sintering Yield, it is characterized in that, spathic iron ore fragmentation is become the pellet that particle diameter is 16 ~ 25mm, using the finished product agglomerate of all or part of for described pellet replacement as grate-layer material, carry out cloth, igniting and sintering afterwards, the high-temperature flue gas utilizing sintering to produce carries out oxidizing roasting process to spathic iron ore, and the temperature bottom control sinter machine is lower than 600 DEG C.
2. the method utilizing spathic iron ore to improve Sintering Yield according to claim 1, it 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 utilizing spathic iron ore to improve Sintering Yield according to claim 2, it 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 utilizing spathic iron ore to improve Sintering Yield according to claim 1, it 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 utilizing spathic iron ore to improve Sintering Yield according to claim 1, it is characterized in that, described agglomerate is high-Ti type V-Ti agglomerate.
6. the method utilizing spathic iron ore to improve Sintering Yield according to claim 1, is characterized in that, control the dosage of coke in raw materials for sintering at 4.5 ~ 4.8wt%.
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| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| JPH04259339A (en) * | 1991-02-08 | 1992-09-14 | Sumitomo Metal Ind Ltd | Production of sintered ore |
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| 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 |
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