CN102978377A - Powder material rotary kiln reducing roasting device and process using device - Google Patents
Powder material rotary kiln reducing roasting device and process using device Download PDFInfo
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- CN102978377A CN102978377A CN2012104971301A CN201210497130A CN102978377A CN 102978377 A CN102978377 A CN 102978377A CN 2012104971301 A CN2012104971301 A CN 2012104971301A CN 201210497130 A CN201210497130 A CN 201210497130A CN 102978377 A CN102978377 A CN 102978377A
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Abstract
The invention discloses a powder material rotary kiln reducing roasting device and a process using the device. The device comprises a rotary kiln and a hot blast heater, wherein an air outlet of the hot blast heater faces to an air inlet at the front end of the rotary kiln along the motion direction of the material and the generated hot air is fed into the rotary kiln; the motion direction of the hot air is the same as that of the material; and a tail gas exhaust port and a drainage port are formed at the tail end of the rotary kiln. The process comprises the following steps of: (1) preparing reducing coals with the mass ratio of 0-20 percent in powder materials; (2) quantificationally adding the mixed powder materials into the rotary kiln and introducing hot air into the rotary kiln; (3), reducing the mixed powder materials in the rotary kiln; and (4), cooling the reduced powder materials into the rotary kiln, discharging the powder materials from the drainage port at the tail end of the rotary kiln, performing dust removal on the tail gas and then feeding a part of the tail gas into the rotary kiln for recycling. The powder material rotary kiln reducing roasting device has the advantages of simple, compact structure and low cost, is convenient for operation, and is capable of improving the reducing roasting efficiency and guarantying the reducing roasting quality.
Description
Technical field
The present invention is mainly concerned with the ore-dressing technique apparatus field, refer in particular to a kind of pulverulent material rotary kiln reduction roasting device and technique thereof, mainly be applicable to the magnetizing roasting of sulfidation roasting, powdery limonite and the spathic iron ore of lead-zinc, the reducing roasting of fine fraction manganese oxide ore etc.
Background technology
Along with the day by day scarcity of Mineral resources, the oxidized ore of difficult choosing reclaims and utilizes the great attention that is subject to gradually the scientific worker at present.In the situation that common process and method are felt simply helpless, adopt the reducing roasting pre-treatment after, adopt again the method for better simply conventional ore dressing to address the above problem preferably.As: adopt rotary kiln to the magnetic roasting process of limonite, to the reducing roasting of manganese oxide ore, the sulfidation roasting of lead-zinc etc.But yet there are no the rotary kiln baking device that relates to pulverulent material and the industrial application of technique in the prior art.
Because in recent years iron ore concentrate price increase, the rotary kiln magnetizing roasting of iron ore begins widely industrial application in China, in Shaanxi, the ground such as Xinjiang, Yunnan have nearly ten of the large-sized rotary kilns of Φ 4.0 * 60m.But the problems such as traditional equipment and process ubiquity energy consumption is high, ring formation is serious.In addition, for satisfying the electrolytic manganese needs that day by day increase, low-grade manganese oxide rotary kiln reducing roasting technology has begun industrial application.But because the manganese ore silt content is higher, the ring formation phenomenon is more serious.
There is following problem in traditional rotary kiln reducing roasting technique:
1, present rotary kiln can only be processed the material of granularity 0～20mm, and-1mm fine fraction content can not be greater than 10%, and namely rotary kiln can not be processed pulverulent material at present.
2, the generation heat carries out reduction reaction because fuel burns in rotary kiln, and the local temperature of generation can reach 1000 ℃, and its harm has: the one, make ring formation in the kiln, and impact is normally produced; Find that by long-term commerical test and practical studies low melting point, tiny powdered material are the major cause that produces " ring formation " in the rotary kiln localized high temperature regions.The 2nd, some material made material become waste material owing to high temperature produces reduction.
3, in traditional technology, owing to be that material and hot blast are that adverse current is carried out, this just makes easily, and fugitive constituent volatilizees when kiln tail cold zone in the reductive agent, can not produce quickly and efficiently reductive action.
4, the temperature of kiln tail is 300 ℃, but kiln hood ore discharge ore temperature reaches more than 600 ℃, and energy wastage is large.
5, kiln tail ash quantum of output is large.If material fine fraction content is high, fine is directly larger from the amount that the kiln tail is extracted out without crossing the high-temperature zone.
Summary of the invention
The technical problem to be solved in the present invention just is: for the technical problem that prior art exists, the invention provides a kind of simple and compact for structure, with low cost, easy and simple to handle, can improve reducing roasting efficient, guarantee the reducing roasting quality, heat utilization efficiency is high, energy consumption is low pulverulent material rotary kiln reduction roasting device and technique thereof.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of pulverulent material rotary kiln reduction roasting device, comprise rotary kiln and hotblast stove, direction of motion along material, the front end of described rotary kiln is provided with opening for feed and blast inlet, described opening for feed links to each other with feeding assembly, the air outlet of described hotblast stove is sent in the rotary kiln towards the blast inlet of rotary kiln front end and with the hot blast that produces, and the direction of motion of hot blast and the direction of motion of material keep in the same way; The tail end of described rotary kiln is provided with exhaust port and discharge gate, and the tail gas that produces when described exhaust port is used for rotary kiln worked is discharged, and described discharge gate is used for the discharge of materials that will finish after the reducing roasting.
The exhaust port of described rotary kiln links to each other with a ventilation and dust removal assembly, and the output terminal of described ventilation and dust removal assembly links to each other with hotblast stove by pipeline and the dedusting wind circulation that generates is fed hotblast stove.
Described ventilation and dust removal assembly comprises whirlpool fly-ash separator, sack cleaner, induced draft fan, worm conveyor and middle flue-dust retainer, behind the whirlpool fly-ash separator, send into sack cleaner through the tail gas that exhaust port on the rotary kiln is discharged, flue-dust retainer in the middle of collected dust is directly sent into; Described sack cleaner is sent hot blast back to hotblast stove through induced draft fan after tail gas is carried out again dedusting, flue-dust retainer in the middle of the dust that described sack cleaner is collected is sent into behind worm conveyor.
Arrange one between described hotblast stove and the rotary kiln and be used for purifying the cinder in the hot blast, the purification reduction assembly of the unnecessary oxygen of elimination.
Described feeding assembly comprises blending bun and batch mixing rubber conveyer, finishes pulverulent material and go back the opening for feed of sending into the rotary kiln front end behind the mixture operation of raw coal through the batch mixing rubber conveyer in blending bun.
Discharge gate on the described rotary kiln tail end links to each other with a screw classifier, and coarse fraction enters ore-sorting system after the cooling of screw classifier, and fine fraction is sent into thickening pond; The discharge gate ejecta of described thickening pond also enters ore-sorting system, and overflow water is sent into screw classifier after by the slag stock pump again.
The present invention further provides the reducing roasting technique that adopts behind the above-mentioned pulverulent material rotary kiln reduction roasting device, the steps include:
(1) being equipped with mass ratio in pulverulent material is 0～20% the raw coal of going back;
(2) will mix rear powder material quantitative and add in the rotary kiln, in rotary kiln, pass into the reductibility hot blast simultaneously, and guarantee the reductibility hot blast and mix rear pulverulent material in rotary kiln, to keep in the same way operation;
(3) mixing rear pulverulent material is reduced in rotary kiln;
(4) discharge gate from the rotary kiln tail end after pulverulent material cools off in rotary kiln after the mixing that is reduced is discharged; The material of discharging after the cooling enters in the ore-sorting system enrichment valuable mineral; Tail gas is sent into the ventilation and dust removal assembly, and the dedusting wind that produces is again fed hotblast stove and enters rotary kiln, carries out the secondary circulation utilization.
For the sulfidation roasting of powdery lead-zinc, its maturing temperature should be 600～750 ℃, and the rotary kiln rotating speed is 1～5rpm, interior coal blending 0～20%, and the sulfuration rate of plumbous zinc reaches more than 75%.
For the pulverulent material magnetizing roasting of spathic iron ore, limonite, rhombohedral iron ore, 650～800 ℃ of its maturing temperatures, rotary kiln rotating speed 1～5rpm, interior coal blending 1～20%, susceptibility reaches more than 80%.
For the pulverulent material reducing roasting of manganese oxide ore, 700～800 ℃ of its maturing temperatures, rotary kiln rotating speed are 1～5rpm, interior coal blending 5～20%, and reduction ratio reaches more than 85%.
Compared with prior art, the invention has the advantages that:
1, the present invention can carry out the direct roasting of pulverulent material, need not ball processed.
2, owing to be to adopt the hotblast stove heating, i.e. hot blast low-temperature reduction roasting, can not cause local superheating, material and heat following current can guarantee that all materials can both well be reacted through the high-temperature zone; Simultaneously, can effectively control maturing temperature below 900 ℃, avoid the burning of localized hyperthermia to material, also can not cause the ring formation of rotary kiln phenomenon.
3, the present invention carries in the same way by roasted ore and hot blast, can reach the fine fraction fast restore, quick collection; Simultaneously, by hot blast is carried out circular treatment, can control preferably the reducing atmosphere in the rotary kiln.
4, roasting product of the present invention can cool off under protective atmosphere gradually, preferably effective use of energy sources, while and the reaction of residual coal generation secondary reduction.
5, calcination process of the present invention can reduce effectively that primary slime improves floatation indicators to the impact of flotation in the ore such as plumbous oxide zinc.
6, device of the present invention is controlled maturing temperature and reducing atmosphere easily, and can not cause ring formation of rotary kiln, heat utilization efficiency is high, energy consumption is low.Compare conventional equipment and technique, the roasting material properties is more stable, is conducive to follow-up ore dressing sorting, and the actual recovered rate is better.
Description of drawings
Fig. 1 is the structural representation of the present invention in concrete application example.
Marginal data:
1, rotary kiln; 2, hotblast stove; 3, blending bun; 4, batch mixing rubber conveyer; 5, whirlpool fly-ash separator; 6, sack cleaner; 7, induced draft fan; 8, worm conveyor; 9, middle flue-dust retainer; 10, screw classifier; 11, thickening pond; 12, slag stock pump; 13, purify the reduction assembly.
Embodiment
Below with reference to Figure of description and specific embodiment the present invention is described in further details.
As shown in Figure 1, pulverulent material rotary kiln reduction roasting device of the present invention comprises rotary kiln 1 and hotblast stove 2, this hotblast stove 2 can produce the hot blast of high heating value, low oxygen content, it can adopt high combustion value coal or Sweet natural gas to act as a fuel, and uses low blast volume, and produces a large amount of hot blasts.Along the direction of motion of material, the front end of rotary kiln 1 is provided with opening for feed and blast inlet, and opening for feed links to each other with feeding assembly, and material is sent in the rotary kiln 1 by opening for feed behind feeding assembly.The air outlet of hotblast stove 2 is sent into the hot blast that produces in the rotary kiln 1 towards the blast inlet of rotary kiln 1 front end, and the direction of motion of hot blast and the direction of motion of material keep in the same way.The tail end of rotary kiln 1 is provided with exhaust port and discharge gate, and the tail gas that exhaust port produces when being used for rotary kiln 1 work is discharged, and discharge gate is used for the discharge of materials that will finish after the reducing roasting.
In the present embodiment, further the exhaust port with rotary kiln 1 links to each other with a ventilation and dust removal assembly, utilize the ventilation and dust removal assembly that tail gas is processed, the dedusting wind that generates is secondary use, and the dedusting wind that is about to be rich in CO feeds hotblast stove 2 by the induced draft fan circulation.In other embodiments, dedusting wind also can directly discharge as required.
In the present embodiment, further between hotblast stove 2 and rotary kiln 1, arrange one and be used for purifying and the purification reduction assembly 13 that reduces air-flow, its objective is the cinder in the hot blast is purified, and eliminate unnecessary oxygen.
In the present embodiment, feeding assembly comprises blending bun 3 and batch mixing rubber conveyer 4, after in blending bun 3, finishing pulverulent material and going back the mixture operation of raw coal, send into the opening for feed of rotary kiln 1 front end through batch mixing rubber conveyer 4, and can be by the speed of batch mixing rubber conveyer 4 control chargings.
In the present embodiment, the ventilation and dust removal assembly comprises whirlpool fly-ash separator 5, sack cleaner 6, induced draft fan 7, worm conveyor 8 and middle flue-dust retainer 9, behind whirlpool fly-ash separator 5, send into sack cleaner 6 through the tail gas that exhaust port on the rotary kiln 1 is discharged, flue-dust retainer 9 in the middle of collected dust is directly sent into.Sack cleaner 6 can adopt the long bag and low pulse cloth bag, and it sends hot blast back to hotblast stove 2 through induced draft fan 7 after tail gas is carried out again dedusting, carries out the secondary circulation utilization, by hot blast is carried out circular treatment, can control preferably the reducing atmosphere in the rotary kiln 1.Flue-dust retainer 9 in the middle of the dust that sack cleaner 6 is collected is sent into behind worm conveyor 8.
In the present embodiment, the discharge gate on rotary kiln 1 tail end links to each other with a screw classifier 10, and the material of finishing reducing roasting is drained in the screw classifier 10.Coarse fraction after the cooling of screw classifier 10 (coarse fraction) enters ore-sorting system, and fine fraction (fine fraction) is sent into thickening pond 11; The sand setting of thickening pond 11 (discharge gate ejecta) also enters ore-sorting system, and overflow water then by again sending into screw classifier 10 behind the slag stock pump 12, carries out recycle.
After adopting above-mentioned pulverulent material rotary kiln reduction roasting device, the present invention further provides a kind of pulverulent material rotary kiln reducing roasting technique, the steps include:
1, being equipped with mass ratio in pulverulent material is 0～20% the raw coal of going back, and mixes; That is, go back raw coal and account for 0～20% of the rear pulverulent material quality of mixing.
2, will mix rear powder material quantitative and add in the rotary kiln 1, in rotary kiln 1, pass into hot blast simultaneously; Pulverulent material moves in the same way in rotary kiln 1 interior maintenance after guaranteeing hot blast and mixing, because material and hot blast are carried in the same way, can effectively control maturing temperature below 900 ℃, avoids localized hyperthermia to the burning of material, also can not cause the ring formation of rotary kiln phenomenon; Simultaneously can also reach the effect of fine fraction fast restore, quick collection, thereby greatly improve the efficient of reducing roasting.In this process, pulverulent material is sent into from the opening for feed that is arranged in rotary kiln 1 front end by feeding assembly after mixing; The reductibility hot blast is produced by hotblast stove 2, directly passes into the blast inlet that is positioned at rotary kiln 1 front end.
3, according to material fast restore, the quick principle that reclaims, pulverulent material is reduced in rotary kiln 1 after mixing;
4, pulverulent material is discharged from the discharge gate of rotary kiln 1 tail end after 1 interior cooling for some time at rotary kiln after the mixing that is reduced.In this process, can adopt according to actual needs water cooling or dry and cold or other mode.The tail gas that produces in rotary kiln 1 roasting process is discharged by the exhaust port of rotary kiln 1 tail end.
The material of 5, discharging after the cooling enters and sorts in the assembly enrichment valuable mineral.Tail gas can be sent into the ventilation and dust removal assembly, and the dedusting wind that produces is entered rotary kiln 1 again, carries out the secondary circulation utilization.By hot blast is carried out circular treatment, can control preferably the reducing atmosphere in the rotary kiln 1.
Device of the present invention and technique are fit to different types of pulverulent material, for example powdery lead-zinc, spathic iron ore, limonite, rhombohedral iron ore, manganese oxide ore etc.
For the sulfidation roasting of powdery lead-zinc, its maturing temperature should be 600～750 ℃, and the rotary kiln rotating speed is 1～5rpm, interior coal blending 0～5%, and the sulfuration rate of plumbous zinc reaches more than 75%.
For the pulverulent material magnetizing roasting of spathic iron ore, limonite, rhombohedral iron ore, 650～800 ℃ of its maturing temperatures, rotary kiln rotating speed 1～5rpm, interior coal blending 1～10%, susceptibility reaches more than 80%.
For the pulverulent material reducing roasting of manganese oxide ore, 700～800 ℃ of its maturing temperatures, rotary kiln rotating speed are 1～5rpm, interior coal blending 5～20%, and reduction ratio reaches more than 85%.
In a concrete application example, certain low-grade refractory oxidized leadzinc ore has been stored up more than 3,000 ten thousand tons owing to there is not suitable method to carry out ore dressing.After adopting device of the present invention and technique to carry out the sulfidation roasting processing, generated lead sulfide and zinc sulphide, then adopt conventional lead-zinc sulfide ore beneficiation method just can obtain preferably sorting index.
With-0.074mm account for about 45%, powder material plumbous 1.5%, zinc 6.5% allocates fine coal 5% into, fully behind the mixing, feed with input speed 600kg/h in the rotary kiln of Φ 1.6 * 28m, the heating of employing hotblast stove, the control maturing temperature is at 600～750 ℃, and rotating speed 1.5rpm carries out roasting.Roasted ore is regrinded to-200 order 90%(valuable mineral basic monomers and is dissociated) after routinely lead-zinc sulfide ore bulk flotation flow process, sweep three essences by one thick two and obtain grade Pb+Zn＞40%, the collective concentrate of plumbous zinc recovery about 80%.
Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art the some improvements and modifications not breaking away under the principle of the invention prerequisite should be considered as protection scope of the present invention.
Claims (10)
1. pulverulent material rotary kiln reduction roasting device, it is characterized in that: comprise rotary kiln (1) and hotblast stove (2), direction of motion along material, the front end of described rotary kiln (1) is provided with opening for feed and blast inlet, described opening for feed links to each other with feeding assembly, the air outlet of described hotblast stove (2) is sent in the rotary kiln (1) towards the blast inlet of rotary kiln (1) front end and with the hot blast that produces, and the direction of motion of hot blast and the direction of motion of material keep in the same way; The tail end of described rotary kiln (1) is provided with exhaust port and discharge gate, and the tail gas that produces when described exhaust port is used for rotary kiln (1) worked is discharged, and described discharge gate is used for the discharge of materials that will finish after the reducing roasting.
2. pulverulent material rotary kiln reduction roasting device according to claim 1, it is characterized in that: the exhaust port of described rotary kiln (1) links to each other with a ventilation and dust removal assembly, and the output terminal of described ventilation and dust removal assembly links to each other with hotblast stove (2) by pipeline and the dedusting wind circulation that generates is fed hotblast stove (2).
3. pulverulent material rotary kiln reduction roasting device according to claim 2, it is characterized in that: described ventilation and dust removal assembly comprises whirlpool fly-ash separator (5), sack cleaner (6), induced draft fan (7), worm conveyor (8) and middle flue-dust retainer (9), behind whirlpool fly-ash separator (5), send into sack cleaner (6) through the tail gas that the upper exhaust port of rotary kiln (1) is discharged, flue-dust retainer (9) in the middle of collected dust is directly sent into; Described sack cleaner (6) is sent hot blast back to hotblast stove (2) through induced draft fan (7) after tail gas is carried out again dedusting, flue-dust retainer (9) in the middle of the dust that described sack cleaner (6) is collected is sent into behind worm conveyor (8).
4. the described pulverulent material rotary kiln of any one reduction roasting device according to claim 1～3 is characterized in that: arrange one between described hotblast stove (2) and the rotary kiln (1) and be used for purifying the cinder in the hot blast, the purification reduction assembly (13) of the unnecessary oxygen of elimination.
5. the described pulverulent material rotary kiln of any one reduction roasting device according to claim 1～3, it is characterized in that: described feeding assembly comprises blending bun (3) and batch mixing rubber conveyer (4), finishes pulverulent material and go back the opening for feed of sending into rotary kiln (1) front end behind the mixture operation of raw coal through batch mixing rubber conveyer (4) in blending bun (3).
6. the described pulverulent material rotary kiln of any one reduction roasting device according to claim 1～3, it is characterized in that: the discharge gate on described rotary kiln (1) tail end links to each other with a screw classifier (10), after the classification of screw classifier (10), coarse fraction enters ore-sorting system, and it is concentrated that fine fraction is sent into thickening pond (11); The sand setting of described thickening pond (11) also enters ore-sorting system, and overflow water is again sent into screw classifier (10) after by slag stock pump (12) and carried out recycle.
7. one kind is adopted the reducing roasting technique behind the described pulverulent material rotary kiln of any one reduction roasting device in the claim 1～6, it is characterized in that step is:
(1) being equipped with mass ratio in pulverulent material is 0～20% the raw coal of going back;
(2) will mix rear powder material quantitative and add in the rotary kiln (1), in rotary kiln (1), pass into hot blast simultaneously, and guarantee hot blast and mix rear pulverulent material in rotary kiln (1), to keep in the same way operation;
(3) mixing rear pulverulent material is reduced in rotary kiln (1);
(4) discharge gate from rotary kiln (1) tail end after pulverulent material cools off in rotary kiln (1) after the mixing that is reduced is discharged; The material of discharging after the cooling enters in the ore-sorting system enrichment valuable mineral; Tail gas is sent into the ventilation and dust removal assembly, and the dedusting wind that produces is entered rotary kiln (1) again, carries out the secondary circulation utilization.
8. reducing roasting technique according to claim 7 is characterized in that, when being applied to the sulfidation roasting of powdery lead-zinc, maturing temperature should be 600～750 ℃, interior coal blending 0～20%.
9. reducing roasting technique according to claim 7 is characterized in that, when being applied to the pulverulent material magnetizing roasting of spathic iron ore, limonite, rhombohedral iron ore, maturing temperature should be 650～800 ℃, interior coal blending 1～20%.
10. reducing roasting technique according to claim 7 is characterized in that, when being applied to the pulverulent material reducing roasting of manganese oxide ore, and 700～800 ℃ of maturing temperatures, interior coal blending 5～20%.
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Cited By (5)
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| CN103316755A (en) * | 2013-07-16 | 2013-09-25 | 罗德明 | One-piece magnetic reduction preparation equipment and its process flow |
| CN103344107A (en) * | 2013-05-17 | 2013-10-09 | 周海彬 | Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating |
| CN103643032A (en) * | 2013-12-02 | 2014-03-19 | 武汉理工大学 | Method for magnetically roasting weak-magnetic iron ore |
| CN108165731A (en) * | 2017-12-07 | 2018-06-15 | 宁夏天元锰业有限公司 | A kind of method that manganese oxide ore carries out reduction roasting |
| CN113976097A (en) * | 2021-12-29 | 2022-01-28 | 山西炬华新材料科技有限公司 | Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103344107A (en) * | 2013-05-17 | 2013-10-09 | 周海彬 | Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating |
| CN103344107B (en) * | 2013-05-17 | 2014-11-26 | 周海彬 | Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating |
| CN103316755A (en) * | 2013-07-16 | 2013-09-25 | 罗德明 | One-piece magnetic reduction preparation equipment and its process flow |
| CN103643032A (en) * | 2013-12-02 | 2014-03-19 | 武汉理工大学 | Method for magnetically roasting weak-magnetic iron ore |
| CN108165731A (en) * | 2017-12-07 | 2018-06-15 | 宁夏天元锰业有限公司 | A kind of method that manganese oxide ore carries out reduction roasting |
| CN113976097A (en) * | 2021-12-29 | 2022-01-28 | 山西炬华新材料科技有限公司 | Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst |
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Application publication date: 20130320 |