CN104195325A - Step-by-step oxygenating, magnetizing and roasting process of powdery difficult-to-separate iron ores in tunnel kiln - Google Patents
Step-by-step oxygenating, magnetizing and roasting process of powdery difficult-to-separate iron ores in tunnel kiln Download PDFInfo
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- CN104195325A CN104195325A CN201410380941.2A CN201410380941A CN104195325A CN 104195325 A CN104195325 A CN 104195325A CN 201410380941 A CN201410380941 A CN 201410380941A CN 104195325 A CN104195325 A CN 104195325A
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Abstract
The invention provides a step-by-step oxygenating, magnetizing and roasting process of powdery difficult-to-separate iron ores in a tunnel kiln. The process comprises the following steps: (1) dividing the iron ores with the granularity of 0-15mm into the iron ores in granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm, respectively mixing the iron ores with the different granularities and reduced coal according to a ratio of 100 to (1-3) so as to obtain mixed materials in corresponding granularity ranges; (2) successively and horizontally paving the mixed materials with the granularities of 0-1mm, 1-3mm, 3-5mm and 5-15mm on a bench surface of a kiln car in the tunnel kiln from bottom to top; (3) pushing the kiln car charged with the mixed materials into the tunnel kiln from a kiln entering end of the tunnel kiln, and gradually preheating, heating, roasting and cooling the mixed materials; (4) carrying out ore grinding on the roasted mixed materials and then carrying out magnetic separation so as to obtain fine iron powder with the iron grade above 54% and the metal recovery rate above 80%. According to the process, the iron ores with the different granularities, which are reduced in the tunnel kiln layer by layer from top to bottom and oxygenated at an upper layer by depending on a lower layer, can be uniformly magnetized and roasted.
Description
Technical field
The invention belongs to metallurgical and mineral engineering technology field, relate to a kind of powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process.
Background technology
The fast development of China's Iron And Steel Industry and the iron ore contradiction that there is lack of raw materials, the development of iron and steel enterprise faces immense pressure, domestic refractory iron ore resource of while is relatively abundant but utilization ratio is not high, strengthen the domestic exploitation to refractory iron ore resource, the treatment process of the reliable and economical rationality of discovery techniques, has important scientific value and realistic meaning.
Iron ore utilizes magnetizing roasting technology to become one of effective way of raising refractory iron ore comprehensive utilization of resources rate.At present, the magnetizing roasting equipment that difficulty selects iron ore of low ore grade to adopt mainly contains shaft furnace and rotary kiln, massive iron ore adopts shaft furnace magnetizing roasting-magnetic separation process, there is good mineral processing index, and powdered iron ore adopts rotary kiln technology, when maturing temperature control is 700～750 ℃, magnetizing roasting quality and the separation index of its roasted ore are better than shaft furnace, but while being 0～25mm iron ore due to rotary kiln magnetizing roasting granularity, exist ring formation, reduce inhomogeneous, roasting high in cost of production problem, restricted its promotion and application at home.When powdery refractory iron ore adopts high intensity magnetic separation process, its metal recovery rate generally only has 67～68%, and iron concentrate grade is 46～48%, has caused the larger wasting of resources.
Summary of the invention
?the present invention is directed to that the granularity that rotary kiln technology that at present domestic 0～15mm refractory iron ore magnetizing roasting adopts exists differs large, iron ore roasting quality is uneven, be prone to ring formation and the lower problem of metal recovery rate in producing, and refractory iron ore adopts all lower present situations of metal recovery rate that high intensity magnetic separation process exists and iron grade, provide a kind of powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process.
For this reason, the present invention adopts following technical scheme:
A powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process, comprises following processing step:
(1) 0～15mm grade scope iron ore is divided into 0～1mm, 1～3mm, 3～5mm, 5～15mm grade scope, above-mentioned size fractionated iron ore respectively with go back the mixture that obtains corresponding grade scope after raw coal mixes in 100:1～3 ratio batching;
(2) on the table top of kiln car, tile successively from bottom to up 0～1mm, 1～3mm, 3～5mm, 5～15mm grade mixture, every layer of material thickness is 30～50mm, it is 120～200mm that material total thickness is controlled;
(3) kiln car that material is housed is pushed from the kiln end that enters of tunnel furnace, kiln car is in preheating zone, roasting band and the cooling zone process of process of passing through tunnel kiln, material is preheated, adds thermal bake-out and cooling gradually, and the maturing temperature of controlling roasting band is that 830～900 ℃, roasting time are 30～50min;
(4) after roasting, material adopts griding technology to make its granularity reach-200 orders to account for more than 80%, then carry out magnetic separation, obtains iron grade and be more than 54%, metal recovery rate is more than 80% iron fine powder.
Further, in step (1), by 0～1mm and 1～3mm grade scope iron ore respectively with 0～3mm grade scope also raw coal in the ratio of 100:1～2, prepare burden and mix, obtain respectively 0～1mm and 1～3mm grade mixture.
Further, in step (1), by 3～5mm and 5～15mm grade scope iron ore respectively with 3～5mm grade scope also raw coal in the ratio of 100:2～3, prepare burden and mix, obtain respectively 3～5mm and 5～15mm grade mixture.
Further, in step (1), 0～1mm and the coal blending of 1～3mm grade scope iron ore select volatile matter higher go back raw coal, 3～5mm and the coal blending of 5～15mm grade scope iron ore select volatile matter lower go back raw coal or blue carbon.
Cardinal principle of the present invention is as follows:
1, for improving the heat transfer efficiency of iron ore in tunnel furnace and improving reduction effect, adopt iron ore to be laid in the method heating on kiln car with reducing after mixing with coal, can make kiln fuel combustion product and iron ore carry out direct heat exchange.Because the heating heat of material layer lower part conducts by fire-resistant heat-conducting plate, and the heating heat on bed of material top comes by furnace cavity direct radiation, and therefore, the temperature on bed of material top will be higher than temperature of lower.Accordingly, the present invention makes within identical heat-up time, to reach with smaller particle size material compared with volume particle size material higher reduction effect, and in view of needing higher reduction temperature compared with volume particle size material, take 0～1mm grade mixture to be distributed in the bottom bed of material, and lay successively 1～3mm, 3～5mm, 5～15mm grade mixture on 0～1mm grade mixture top.
2, be the gasification rate of carbon in each layer of material of strengthening, with improve reduction of iron ore medium concentration, shorten the recovery time, according to small grain size iron ore with go back raw coal and mix after under high temperature reduction rate comparatively fast, unit time generation CO
2tolerance is larger, the slow feature of volume particle size reduction of iron ore, and the method that the present invention takes has: (1) iron ore layer-by-layer distribution, classification oxygenation method.Material is in tunnel furnace in heat-processed, and granularity thicker material in top is under furnace cavity hyperthermia radiation, and first top layer material carries out heat temperature raising, and in temperature-rise period by the heat of Surface absorption gradually to internal delivery.When coarse grain iron ore temperature reaches more than 600 ℃ reduction reaction, start to carry out, and along with the rising of iron ore temperature, reduction reaction is accelerated gradually.When the reducing degree of coarse grain iron ore reaches 65～75%, the CO that reduction produces
2amount reduces, and carbon gasification Speed Reduction makes the speed of reduction of iron ore slack-off gradually, but be now positioned at particulate iron ore under coarse-grained material, has reached the temperature that reduction starts, and with the rising of iron ore temperature, reduction reaction is accelerated gradually, the CO that reduction produces
2gas up flows in the bed of material of bottom, works as CO
2gas stream when the coarse-grained material on upper strata, CO
2gas reacts generation CO gas with the raw coal generating gasification of going back in the coarse grain bed of material, thereby CO gas concentration in coarse-grained material layer is increased, and can accelerate coarse grain reduction of iron ore speed of response, thereby the susceptibility of coarse grain iron ore is improved and recovery time shortening.Therefore, the present invention utilizes the CO that bottom particulate reduction of iron ore produces
2gas is that oxygenation is carried out in the reduction of top coarse grain iron ore, can realize the particulate iron ore of bottom and the coarse grain iron ore on top and within the identical recovery time, reach identical reduction effect, solve iron ore coarse grain iron ore in tunnel furnace simultaneously and owed the problem of reducing, production energy consumption is higher.(2) in 5～15mm grade scope iron ore with addition of the raw coal of going back of 2-3%, when iron ore grade scope reduces, reduce coal blending amount, can improve the reduction rate of different grain size iron ore in tunnel furnace.
3, for reducing combustiblecomponents content in flue gas that tunnel furnace discharges, at reduction of iron ore, use in the selection of coal, for the lower phenomenon of lower floor's particulate reduction of iron ore temperature, for strengthening reducing atmosphere, lower floor's iron ore is selected the coal that volatile matter is higher, and to upper strata coarse grain iron ore because reduction temperature is higher, select coal or blue carbon that volatile matter is lower.
To sum up, beneficial effect of the present invention is:
(1) this technique has reached the object that adopts tunnel kiln equipment to carry out the magnetizing roasting of powdered iron ore;
(2) this technique can make different grain size iron ore successively reduction and lower floor obtain uniform magnetizing roasting in the process of upper strata oxygenation from top to bottom in tunnel furnace;
(3) on tunnel furnace, adopt layer-by-layer distribution Technology to carry out magnetizing roasting, go back raw coal consumption and can be reduced to 1-3% from 5-7% when more not stratified, roasting time reduces to 30 ~ 50min by 50 ~ 80min;
(4) low-grade refractory iron ore adopts this technique to carry out after magnetizing roasting, and roasted ore can obtain through mill choosing that iron grade is more than 54%, metal recovery rate is more than 80% iron fine powder.
Accompanying drawing explanation
Fig. 1 is tunnel furnace material distribution schematic diagram of the present invention;
In figure, 1-tunnel kiln body, 2-kiln car, 3-rail, 4-kiln car wheel hub, 5-kiln vehicle surface, 6-burns and chews, the fire-resistant heat-conducting plate of 7-, 8-0～1mm grade mixture; 9-1～3mm grade mixture, 10-3～5mm grade mixture, 11-5～15mm grade mixture.
Embodiment
embodiment 1
A powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process, comprises following processing step:
(1) adopt method for sieving to be divided into 0～1mm, 1～3mm, 3～5mm, tetra-grade scopes of 5～15mm 0～15mm grade scope iron ore, by 0～1mm and 1～3mm grade scope iron ore respectively with 0～3mm grade scope also raw coal in the ratio of 100:1 and 100:2, prepare burden and mix, obtain respectively 0～1mm and 1～3mm grade mixture; By 3～5mm and 5～15mm grade scope iron ore respectively with 3～5mm grade scope also raw coal in the ratio of 100:2 and 100:3, prepare burden and mix, obtain respectively 3～5mm and 5～15mm grade mixture;
(2) as shown in Figure 1, on the table top of kiln car, tile successively from bottom to up 0～1mm, 1～3mm, 3～5mm, 5～15mm grade mixture, each layer of material thickness is 30mm, 40mm, 50mm, 40mm from bottom to up;
(3) kiln car that material is housed is pushed from the kiln end that enters of tunnel furnace, kiln car is in preheating zone, roasting band and the cooling zone process of process of passing through tunnel kiln, material is preheated, adds thermal bake-out and cooling gradually, and the maturing temperature of controlling roasting band is that 830～860 ℃, roasting time are 50min;
(4) after roasting, material adopts griding technology to make its granularity reach-200 orders to account for more than 80%, then carry out magnetic separation, and magnetic separation magneticstrength is 1000-1500Oe, and after testing, the iron fine powder iron grade obtaining is 55.6%, and metal recovery rate is 80.5%.
embodiment 2
Embodiment 2 is with the difference of embodiment 1:
In step (1), by 0～1mm and 1～3mm grade scope iron ore respectively with 0～3mm grade scope also raw coal in the ratio of 100:1, prepare burden and mix, obtain respectively 0～1mm and 1～3mm grade mixture; By 3～5mm and 5～15mm grade scope iron ore respectively with 3～5mm grade scope also raw coal in the ratio of 100:3 and 100:2, prepare burden and mix, obtain respectively 3～5mm and 5～15mm grade mixture;
In step (2), each layer of material thickness is followed successively by 40mm, 50mm, 30mm, 30mm from bottom to up;
In step (3), the maturing temperature of controlling roasting band is that 850～880 ℃, roasting time are 40min;
In step (4), after testing, the iron fine powder iron grade obtaining is 56.2%, and metal recovery rate is 81.3%.
embodiment 3
Embodiment 3 is with the difference of embodiment 1:
In step (1), by 0～1mm and 1～3mm grade scope iron ore respectively with 0～3mm grade scope also raw coal in the ratio of 100:2, prepare burden and mix, obtain respectively 0～1mm and 1～3mm grade mixture; By 3～5mm and 5～15mm grade scope iron ore respectively with 3～5mm grade scope also raw coal in the ratio of 100:3, prepare burden and mix, obtain respectively 3～5mm and 5～15mm grade mixture;
In step (2), each layer of material thickness is followed successively by 50mm, 30mm, 40mm, 50mm from bottom to up;
In step (3), the maturing temperature of controlling roasting band is that 870～900 ℃, roasting time are 30min;
In step (4), after testing, the iron fine powder iron grade obtaining is 57.1%, and metal recovery rate is 83.3%.
Claims (4)
1. a powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process, is characterized in that, comprises following processing step:
(1) 0～15mm grade scope iron ore is divided into 0～1mm, 1～3mm, 3～5mm, 5～15mm grade scope, above-mentioned size fractionated iron ore respectively with go back the mixture that obtains corresponding grade scope after raw coal mixes in 100:1～3 ratio batching;
(2) on the table top of kiln car, tile successively from bottom to up 0～1mm, 1～3mm, 3～5mm, 5～15mm grade mixture, it is 30～50mm that every layer of material thickness controlled, it is 120～200mm that material total thickness is controlled;
(3) kiln car that material is housed is pushed from the kiln end that enters of tunnel furnace, kiln car is in preheating zone, roasting band and the cooling zone process of process of passing through tunnel kiln, material is preheated, adds thermal bake-out and cooling gradually, and the maturing temperature of controlling roasting band is that 830～900 ℃, roasting time are 30～50min;
(4) after roasting, material adopts griding technology to make its granularity reach-200 orders to account for more than 80%, then carry out magnetic separation, obtains iron grade and be more than 54%, metal recovery rate is more than 80% iron fine powder.
2. a kind of powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process according to claim 1, it is characterized in that, in step (1), by 0～1mm and 1～3mm grade scope iron ore respectively with 0～3mm grade scope also raw coal in the ratio of 100:1～2, prepare burden and mix, obtain respectively 0～1mm and 1～3mm grade mixture.
3. a kind of powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process according to claim 1, it is characterized in that, in step (1), by 3～5mm and 5～15mm grade scope iron ore respectively with 3～5mm grade scope also raw coal in the ratio of 100:2～3, prepare burden and mix, obtain respectively 3～5mm and 5～15mm grade mixture.
4. a kind of powdery refractory iron ore tunnel furnace Graded reoxygenation magnetic roasting process according to claim 1, it is characterized in that, in step (1), 0～1mm and the coal blending of 1～3mm grade scope iron ore select volatile matter higher go back raw coal, 3～5mm and the coal blending of 5～15mm grade scope iron ore select volatile matter lower go back raw coal or blue carbon.
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| CN105925806A (en) * | 2016-06-16 | 2016-09-07 | 江苏省冶金设计院有限公司 | Direct reduction and metallurgy method |
| CN108754132A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | A method of improving Metallurgical Properties of Sinter |
| CN108754131A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | A kind of sintering production method of optimization fuel collocation |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104726691A (en) * | 2015-04-03 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Reducing roasting method for powdered iron ores in tunnel kiln |
| CN104745805A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Whole-grade powdery iron ore magnetizing and roasting process based on three tandem rotary kilns |
| CN104745804A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for improving grade and recovery rate of roasting ore separation iron ore |
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| CN105925806A (en) * | 2016-06-16 | 2016-09-07 | 江苏省冶金设计院有限公司 | Direct reduction and metallurgy method |
| CN108754132A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | A method of improving Metallurgical Properties of Sinter |
| CN108754131A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | A kind of sintering production method of optimization fuel collocation |
| CN108754131B (en) * | 2018-06-14 | 2020-02-18 | 鞍钢股份有限公司 | Sintering production method for optimizing fuel matching |
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