CN205352043U - Be used for reductive rotary kiln in laterite -nickel ore ore deposit - Google Patents
Be used for reductive rotary kiln in laterite -nickel ore ore deposit Download PDFInfo
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- CN205352043U CN205352043U CN201620029786.4U CN201620029786U CN205352043U CN 205352043 U CN205352043 U CN 205352043U CN 201620029786 U CN201620029786 U CN 201620029786U CN 205352043 U CN205352043 U CN 205352043U
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Abstract
The utility model provides a be used for reductive rotary kiln in laterite -nickel ore ore deposit, it includes raw materials preheating tank, prereduction kiln, melting reduction kiln, gathers dust and tail gas circulation system and fuel nozzle to state the rotary kiln. The utility model provides a be used for reductive rotary kiln in laterite -nickel ore ore deposit adopts preheating tank to add two reduction kilns, can effectively prevent rotary kiln ring formation phenomenon, tail gas directly gets into laterite -nickel ore ore deposit prereduction kiln from high temperature melting reduction kiln, and then gets into preheating tank, and the tail gas that comes out from preheating tank is after removing dust, and partial tail gas returns the combustion -supporting wind as two reduction kilns, can effectively solve the reality that the general energy utilization of rotary kiln is low like this, high temperature melting reduction kiln adopts two combustion systems that the nozzle combined together, can keep rotary kiln temperature, atmosphere when smelting stably in succession, to be favorable to ferronickel's the formation and the improvement of ferronickel grade, makes the laterite -nickel ore ore deposit generate the ferronickel of grade more than 10%.
Description
Technical field
This utility model relates to ferronickel refining and takes technical field, particularly relates to a kind of rotary kiln for lateritic nickel ore reduction.
Background technology
The nickel content of the nickel pig iron that current Small and Medium Enterprises in China produces is many 4%～8%, can only be used as the dispensing of smelting stainless steel, when smelting stainless steel, and a certain amount of refine pure nickel of addition of still needing.The nickel content being only improved in the nickel pig iron reaches 12%～15%, and when smelting stainless steel, the nickel pig iron can substitute pure nickel completely and use.
Traditional blast furnace process low-grade product market is saturated, and traditional handicraft is nickel minerals → dehydration, sintering, agglomeration → allocate coke into, Si, C, P, S → ferronickel drops in flux → blast furnace process → thick ferronickel → refine.At home, in recent years the pyrometallurgical smelting ferronickel adopted is comparatively general, mainly being borrowed in existing ironmaking small furnace directly to change the line of production, it is similar that concrete operations produce pig iron operation to small furnace, is particularly suitable for using low Ni, high Fe nickel minerals to produce low Ni ferronickel (nickel-contained pig iron).This technique is still using coke combustion heat release as smelting heat energy, and entering the ferrum oxide in stove nickel minerals fully can be reduced by the C in coke, so the Ni content height in thick ferronickel is limited to the scale of Ni and the Fe into stove nickel minerals substantially.Due to the present 400m of country3The use of abnormity small furnace, accelerates development the rotary kiln technology of more than 10% grade, it is possible to expand the market capacity of laterite pyrogenic process nickel further.
Rotary kiln reduction lateritic nickel ore under prior art is prepared in the process of ferronickel, is primarily present the shortcomings such as heat utilization ratio ferronickel grade low, the easy ring formation of rotary kiln, institute's output is low.
Utility model content
For the problems referred to above, this utility model aims to solve the problem that problem as described above.A purpose of the present utility model is to provide a kind of any one ferronickel solved in problem above refining fetching and puts.Specifically, this utility model provides a kind of rotary kiln that realize, that can effectively prevent ring formation simple, easy.
According to first aspect of the present utility model, this utility model provides a kind of rotary kiln for lateritic nickel ore reduction, described rotary kiln of stating includes raw material preheating tank, prereduction kiln, melting and reducing kiln, gather dust and exhaust gas circulation system and fuel nozzle, wherein, first end of described raw material preheating tank is connected with exhaust gas circulation system with described gathering dust, second end of described raw material preheating tank is connected with the first end of described prereduction kiln by tremie pipe and the first flue, second end of described prereduction kiln is connected with the first end of described melting and reducing kiln by chute and the second flue；And wherein, the second end of described prereduction kiln is provided with at least one described fuel nozzle, and the second end of described melting and reducing kiln is provided with fuel nozzle described at least two.
Wherein, described rotary kiln also includes ferronickel magnetic recovery process, and the bottom of the second end of described melting and reducing kiln is connected with described ferronickel magnetic recovery process.
Wherein, the top of the first end of described raw material preheating tank is provided with feeding hole, and described feeding hole is connected with feeding device.
Wherein, it is provided with flap valve in described tremie pipe.
Wherein, the over top of described first flue is provided with baffle plate.
Wherein, the diameter of described melting and reducing kiln is more than the diameter of described prereduction kiln, and the length of described melting and reducing kiln is less than the length of described prereduction kiln.
Wherein, the angle between angle and described melting and reducing kiln and the ground between described prereduction kiln and ground is identical.
Wherein, the outer surface of described prereduction kiln is provided with the first gear ring, the bottom of described prereduction kiln is provided with the first driving device and two the first tugboats, wherein, described first gear ring and described first driving device are in transmission connection, and said two the first tugboat lays respectively at the both sides of described first driving device.
Wherein, the outer surface of described melting and reducing kiln is provided with the second gear ring, the bottom of described melting and reducing kiln is provided with the second driving device and two the second tugboats, wherein, described second gear ring and described second driving device are in transmission connection, and said two the second tugboat lays respectively at the both sides of described second driving device.
Wherein, the bottom of described raw material preheating tank is provided with support column.
The rotary kiln for lateritic nickel ore reduction that this utility model provides, adopts preheating can to add two reduction kilns, it is possible to effectively prevention ring formation of rotary kiln phenomenon；Tail gas directly enters lateritic nickel ore prereduction kiln from high-temperature fusion reduction kiln, then preheating can is entered back into, from preheating can tail gas out after dedusting, partial tail gas returns the combustion air being used as two reduction kilns, so can effectively solve the reality that the general capacity usage ratio of rotary kiln is low；High-temperature fusion reduction kiln adopts the combustion system that two burners combine, and can keep rotary kiln temperature, atmosphere steady and continuous when smelting, be conducive to the generation of dilval and the raising of ferronickel grade, promote lateritic nickel ore to generate the dilval of more than 10% grade.
Being described below for exemplary embodiment is read with reference to the drawings, and other property features of the present utility model and advantage will become apparent from.
Accompanying drawing explanation
The accompanying drawing of the part being incorporated in description and constituting description illustrates embodiment of the present utility model, and is used for together with the description explaining principle of the present utility model.In the drawings, similar accompanying drawing labelling is used for representing similar key element.Accompanying drawing in the following describes is embodiments more of the present utility model, rather than whole embodiment.For those of ordinary skill in the art, under the premise not paying creative work, it is possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 schematically illustrates the structural representation of the rotary kiln for lateritic nickel ore reduction of the present utility model.
Detailed description of the invention
For making the purpose of this utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in this utility model embodiment, technical scheme in this utility model embodiment is clearly and completely described, obviously, described embodiment is a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Basic thought of the present utility model is, adopt two additional preheating cans of reduction kiln, tail gas directly enters lateritic nickel ore prereduction kiln from high-temperature fusion reduction kiln, then preheating can is entered back into, from preheating can tail gas out after dedusting, partial tail gas returns the combustion air being used as two reduction kilns, so can effectively solve the reality that the general capacity usage ratio of rotary kiln is low；High-temperature fusion reduction rotary kiln adopts the combustion system that two burners combine, rotary kiln temperature, atmosphere steady and continuous when smelting can be kept, be conducive to the generation of dilval and the raising of ferronickel grade, promote lateritic nickel ore to generate the dilval of more than 10% grade；Prereduction section is separated with melting and reducing section, adopts two reduction kilns, it is possible to the problem preventing ring formation of rotary kiln very well.
Below in conjunction with accompanying drawing, it is described in detail according to the rotary kiln for lateritic nickel ore reduction provided by the utility model.
This utility model provides a kind of rotary kiln for lateritic nickel ore reduction, and Fig. 1 illustrates the structural representation of this rotary kiln.With reference to shown in Fig. 1, this rotary kiln being used for lateritic nickel ore reduction includes raw material preheating tank 1, prereduction kiln 2, melting and reducing kiln 3, gathers dust and exhaust gas circulation system 4 and fuel nozzle 5, wherein, first end of raw material preheating tank 1 is connected with exhaust gas circulation system 4 with gathering dust, second end of raw material preheating tank 1 is connected with the first end of prereduction kiln 2 with the first flue 122 by tremie pipe 121, and the second end of prereduction kiln 2 is connected with the first end of melting and reducing kiln 3 with the second flue 232 by chute 231；And wherein, the second end of prereduction kiln 2 is provided with at least one fuel nozzle 5, and the second end of melting and reducing kiln 3 is provided with at least two fuel nozzle 5.
The raw material of dilval enters prereduction kiln 2 through tremie pipe 121 and carries out selectivity prereduction, enter melting and reducing kiln 3 then through by chute 231 after first preheating in raw material preheating tank 1；Melting and reducing kiln 3 to the furnace temperature in melting and reducing kiln 3, stable, the continuous print adjustment of smelting atmosphere by least two fuel nozzle 5 of its second end, is carried out high-temperature fusion reduction to entering its interior pre-reduction of laterite-nickel ore, forms the dilval of qualified grade.
Flue gas in melting and reducing kiln 3, enters prereduction kiln 2 via the second flue 232, with at least one fuel nozzle 5 of prereduction kiln 2 second end produced by high-temperature flue gas jointly for lateritic nickel ore prereduction provide heat supply.Wherein, the prereduction that at least one fuel nozzle 5 of prereduction kiln 2 second end is lateritic nickel ore provides major heat source, the flue gas entered through the second flue 232 is then pre-reduction carries out concurrent heating and promotes the formation of reducing atmosphere, and it is making full use of the heat in flue gas, can effectively reduce the digestion of fuel, strengthen the dynamics of reduction simultaneously.The mixed flue gas produced after pre-reduction enters raw material preheating tank 1 then through by the first flue 122, provides heat to the preheating of the raw material of dilval, finally reaches the first end of raw material preheating tank 1, and entrance is gathered dust and exhaust gas circulation system 4 carries out process of gathering dust；Partial tail gas after gathering dust and processing can again return to raw material preheating tank 1, and sequentially enters prereduction kiln 2 and melting and reducing kiln 3 together in company with the raw material of dilval, as the combustion air of fuel nozzle 5, to maximally utilise the waste heat in tail gas.
According to the rotary kiln for lateritic nickel ore reduction of the present utility model, the fuel through fuel nozzle 5 includes but not limited to coke-stove gas, natural gas, producer gas, brown coal upgrading coal gas.
It should be noted that, via gathering dust, how the partial tail gas after processing returns raw material preheating tank 1, belong to gather dust mechanism with exhaust gas circulation system 4 and principal content, and gather dust the concrete structure composition with exhaust gas circulation system 4 and principle thereof, this utility model is not described in detail.
It addition, the rotary kiln for lateritic nickel ore reduction of the present utility model also includes ferronickel magnetic recovery process 6, the bottom of the second end of melting and reducing kiln 3 is connected with ferronickel magnetic recovery process 6.The dilval produced after carrying out high-temperature fusion reduction via melting and reducing kiln 3 is finally reached the second end of melting and reducing kiln 3, and blanking device it is provided with in the bottom of the second end of melting and reducing kiln 3, and be connected with magnetic separation ferronickel recovery system 6, dilval enters magnetic separation ferronickel recovery system 6 through blanking device, after the flow chart such as magnetic separation, drying, just can obtain the dilval product of more than 10% grade.
Specifically, the top of the first end of raw material preheating tank 1 is provided with feeding hole 10, and feeding hole 10 is connected with feeding device 7.Lateritic nickel ore drying, broken after, and additive, reducing agent mixing pelletize, form spherical raw material, soccer star's raw material after feeding hole 10 is added to and preheated in raw material preheating tank 1, is carried out in prereduction kiln 2 by feeding device 7 via tremie pipe 121.
Wherein, flap valve 121a it is provided with in tremie pipe 121, so that tremie pipe 121 keeps closed state when not having raw material to enter, while keeping uniform blanking, dredging, the air of outside enters and causes the air flow shortcircuit caused due to pressure reduction in rotary kiln in rotary kiln, leaks out, constitute unnecessary thermal loss and reduce heat exchange power, and the reduction of lateritic nickel ore is brought adverse effect.
Correspondingly, over top at the first flue 122 is provided with baffle plate 122a, both raw material preheating tank 1 was entered without influence on the flue tail gas in prereduction kiln 2, again it can be avoided that extraneous gas enters prereduction kiln 2 by the first flue pipeline 122, form convection current, not only affect the circulation of flue gas, also can reduce the temperature of flue gas, cause thermal loss.
According to the rotary kiln for lateritic nickel ore reduction of the present utility model, the diameter of its melting and reducing kiln 3 is more than the diameter of prereduction kiln 2, and the length of melting and reducing kiln 3 is less than the length of prereduction kiln 2, and, the angle between angle and melting and reducing kiln 3 and ground between prereduction kiln 2 and ground is identical, so it is able to ensure that lateritic nickel ore at the uniform velocity advances in prereduction kiln 2 and melting and reducing kiln 3, fully reduces, is conducive to the process of ferronickel melting and reducing.
Specifically, the outer surface of prereduction kiln 2 is provided with the first gear ring 201, and the bottom of prereduction kiln 2 is provided with the first driving device 202 and two the first tugboats 203.Wherein, the first gear ring 201 and the first driving device 202 are in transmission connection, and the revolution completing prereduction kiln 2 drives；Two the first tugboats 203 lay respectively at the both sides of the first driving device 202, and prereduction kiln 2 is supported, it is ensured that the stable operation of prereduction kiln 2.
Equally, the outer surface of melting and reducing kiln 3 is provided with the second gear ring 301, and the bottom of melting and reducing kiln 3 is provided with the second driving device 302 and two the second tugboats 303.Wherein, the second gear ring 301 and the second driving device 302 are in transmission connection, and the revolution completing melting and reducing kiln 3 drives；Two the second tugboats 303 lay respectively at the both sides of the second driving device 302, and melting and reducing kiln 3 is supported, it is ensured that the stable operation of melting and reducing kiln 3.
Adaptably, the bottom of raw material preheating tank 1 is provided with support column 11, and support column 11 fixes on the ground, it is ensured that the firm stable of raw material preheating tank 1.
Descriptions above can combine enforcement individually or in every way, and these variant are all within protection domain of the present utility model.
It should be noted that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the article of a series of key element or equipment not only includes those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this article or equipment.When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in the article including described key element or equipment.
This utility model only in order to the technical solution of the utility model to be described and unrestricted, has been described in detail by above example reference only to preferred embodiment.It will be understood by those within the art that, it is possible to the technical solution of the utility model is modified or equivalent replacement, without deviating from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of right of the present utility model.
Claims (10)
1. the rotary kiln for lateritic nickel ore reduction, it is characterized in that, described rotary kiln includes raw material preheating tank (1), prereduction kiln (2), melting and reducing kiln (3), gather dust and exhaust gas circulation system (4) and fuel nozzle (5), wherein, first end of described raw material preheating tank (1) is connected with exhaust gas circulation system (4) with described gathering dust, second end of described raw material preheating tank (1) is connected by the first end of tremie pipe (121) with the first flue (122) with described prereduction kiln (2), second end of described prereduction kiln (2) is connected by the first end of chute (231) with the second flue (232) with described melting and reducing kiln (3)；And wherein, the second end of described prereduction kiln (2) is provided with at least one described fuel nozzle (5), and the second end of described melting and reducing kiln (3) is provided with fuel nozzle described at least two (5).
2. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterized in that, described rotary kiln also includes ferronickel magnetic recovery process (6), and the bottom of the second end of described melting and reducing kiln (3) is connected with described ferronickel magnetic recovery process (6).
3. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterized in that, the top of the first end of described raw material preheating tank (1) is provided with feeding hole (10), and described feeding hole (10) is connected with feeding device (7).
4. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterised in that be provided with flap valve (121a) in described tremie pipe (121).
5. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterised in that the over top of described first flue (122) is provided with baffle plate (122a).
6. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterized in that, the diameter of described melting and reducing kiln (3) is more than the diameter of described prereduction kiln (2), and the length of described melting and reducing kiln (3) is less than the length of described prereduction kiln (2).
7. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterised in that the angle between angle and described melting and reducing kiln (3) and ground between described prereduction kiln (2) and ground is identical.
8. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterized in that, the outer surface of described prereduction kiln (2) is provided with the first gear ring (201), the bottom of described prereduction kiln (2) is provided with the first driving device (202) and two the first tugboats (203), wherein, described first gear ring (201) and described first driving device (202) are in transmission connection, and said two the first tugboat (203) lays respectively at the both sides of described first driving device (202).
9. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterized in that, the outer surface of described melting and reducing kiln (3) is provided with the second gear ring (301), the bottom of described melting and reducing kiln (3) is provided with the second driving device (302) and two the second tugboats (303), wherein, described second gear ring (301) and described second driving device (302) are in transmission connection, and said two the second tugboat (303) lays respectively at the both sides of described second driving device (302).
10. the rotary kiln for lateritic nickel ore reduction as claimed in claim 1, it is characterised in that the bottom of described raw material preheating tank (1) is provided with support column (11).
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| CN201620029786.4U CN205352043U (en) | 2016-01-13 | 2016-01-13 | Be used for reductive rotary kiln in laterite -nickel ore ore deposit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201420A (en) * | 2017-04-14 | 2017-09-26 | 爱润森德（天津）能源科技有限公司 | The energy comprehensive utilization system and its production technology of a kind of smelting in rotary kiln sponge iron |
| CN107267776A (en) * | 2017-07-07 | 2017-10-20 | 沈阳有色金属研究院 | A kind of method that lateritic nickel ore direct-reduction beneficiation enrichment produces ferronickel |
| CN114622051A (en) * | 2021-12-30 | 2022-06-14 | 中冶长天国际工程有限责任公司 | Direct reduction method and device for iron-containing pellets based on internal circulation of hot air of each section of rotary kiln |
| CN116294570A (en) * | 2023-04-03 | 2023-06-23 | 内蒙古景蕾实业有限公司 | Medium-low grade manganese ore pretreatment rotary kiln and feeding system |
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2016
- 2016-01-13 CN CN201620029786.4U patent/CN205352043U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201420A (en) * | 2017-04-14 | 2017-09-26 | 爱润森德（天津）能源科技有限公司 | The energy comprehensive utilization system and its production technology of a kind of smelting in rotary kiln sponge iron |
| CN107267776A (en) * | 2017-07-07 | 2017-10-20 | 沈阳有色金属研究院 | A kind of method that lateritic nickel ore direct-reduction beneficiation enrichment produces ferronickel |
| CN107267776B (en) * | 2017-07-07 | 2019-11-08 | 沈阳有色金属研究院 | A kind of method of lateritic nickel ore direct-reduction-beneficiation enrichment production ferronickel |
| CN114622051A (en) * | 2021-12-30 | 2022-06-14 | 中冶长天国际工程有限责任公司 | Direct reduction method and device for iron-containing pellets based on internal circulation of hot air of each section of rotary kiln |
| CN114622051B (en) * | 2021-12-30 | 2023-03-14 | 中冶长天国际工程有限责任公司 | Direct reduction method and device for iron-containing pellets based on internal circulation of hot air at each section of rotary kiln |
| CN116294570A (en) * | 2023-04-03 | 2023-06-23 | 内蒙古景蕾实业有限公司 | Medium-low grade manganese ore pretreatment rotary kiln and feeding system |
| CN116294570B (en) * | 2023-04-03 | 2023-12-01 | 内蒙古景蕾实业有限公司 | Medium-low grade manganese ore pretreatment rotary kiln and feeding system |
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