CN103740928B - A kind of mixing kiln - Google Patents
A kind of mixing kiln Download PDFInfo
- Publication number
- CN103740928B CN103740928B CN201410033058.6A CN201410033058A CN103740928B CN 103740928 B CN103740928 B CN 103740928B CN 201410033058 A CN201410033058 A CN 201410033058A CN 103740928 B CN103740928 B CN 103740928B
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- kiln
- shaft kiln
- shaft
- rotary kiln
- mixing
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of mixing kiln, including rotary kiln and shaft kiln, shaft kiln top is provided with flue, shaft kiln bottom connects material transferring passage, this material transferring passage end connects with shaft kiln bottom, the other end connects with rotary kiln tail end, shaft kiln top offers charging aperture, and rotary kiln head end is provided with discharging opening, is additionally provided with material detector in material transferring passage.Shaft kiln and rotary kiln are combined as a whole by the present invention, utilize the feature of two kinds of kilns, and the reduction solving Low-grade and hard-to-separate iron ore of low cost utilizes, and the response rate is high, obtains (also can be directly produced reduced iron) of high grade through magnetic separation, applied widely.
Description
Technical field
The present invention relates to kiln, a kind of mixing kiln shaft kiln and rotary kiln being combined as a whole.
Background technology
Although the iron ore reserves of China are bigger, but present the features such as lean, thin and miscellaneous, complicated difficult ore dressing resource proportion is bigger, the technical merit of reasonable development and comprehensive utilization is the highest, production technology is the most relative backward with equipment, cause concentrate grade and the response rate relatively low, it is difficult to meet the production requirement that low cost is smelted.
At present, the iron mine of domestic a large amount of existence is essentially all low-grade lean ore, and these lean ores cannot function as the raw material of ferrum and are directly entered production process.Utilize these lean ores, be generally required for that first lean ore is carried out enrichment and promote.The method promoting low-grade ore generally has: magnetic separation and direct-reduction after magnetic separation, flotation, reverse flotation, magnetizing roast.
For magnetic selection method, owing to the magnetic of bloodstone, limonite etc. is the most weak, even if high-strength magnetic also can only make low-grade iron ore put forward 3～4 grades.Flotation, reverse flotation, the scope of application of the method is less, can typically be only used to the sorting of fraction bloodstone and limonite.The most widely used is the combination treatment method of magnetizing roast-magnetic separation, and low-grade iron mine several can be promoted more grade relative to other by the method, generally can promote 12 grades.Now it is essentially all employing rotary kiln and carries out magnetizing roast.But, the low-grade Ore of existing rotary kiln baking, also exists that reduction is uneven, roasting is relatively costly and ring formation of rotary kiln can not the normal problem such as production.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of mixing kiln, it is possible to is preferably reduced by low-grade iron ore, makes follow-up magnetic separation can obtain more satisfactory grade.
In order to solve above-mentioned technical problem, the present invention takes techniques below scheme:
A kind of mixing kiln, described mixing kiln includes rotary kiln and shaft kiln, shaft kiln top is provided with flue, shaft kiln bottom connects material transferring passage, this material transferring passage end connects with shaft kiln bottom, the other end connects with rotary kiln tail end, shaft kiln top offers charging aperture, and rotary kiln head end is provided with discharging opening.
Material detector (guarantee has material to block, and reduces and avoids the wind come by aerator to enter rotary kiln as far as possible) it is provided with in described material transferring passage.
Described rotary kiln tail end connects exhaust emission pipeline, and this pipeline other end is connected with shaft kiln bottom.
Prelum (avoid the wind-fall come by aerator to fill, or select the negative pressure position of shaft kiln to be attached) it is provided with on described exhaust emission pipeline
In described shaft kiln, bottom is provided with discharging tower tray.
The sidewall of described shaft kiln inner combustion chamber is provided with blast pipe, and this blast pipe is connected with aerator.
Shaft kiln and rotary kiln are combined as a whole by the present invention, in make use of shaft kiln feature to dissolve, to the high temperature solving rotary kiln, the ring formation and stove caused with steam, long operational time completes primary reduction, rotary kiln reducing zone temperature stabilization, the uniform feature of roasting is utilized to complete drastic reduction.Overall cost is suitable with the rotary kiln being generally used for iron ore.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the embodiment of the present invention.
Detailed description of the invention
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, present invention is disclosed a kind of mixing kiln, this mixing kiln includes rotary kiln 1 and shaft kiln 6, shaft kiln 6 top is provided with flue 8, shaft kiln 6 bottom connects material transferring passage 2, this material transferring passage 2 one end connects with shaft kiln 6 bottom, the other end connects with rotary kiln 1 tail end, and shaft kiln 6 top offers charging aperture 9, and rotary kiln 1 head end is provided with discharging opening 11.Shaft kiln 1 and rotary kiln 6 are interconnected formation connected relation by material transferring passage 2 so that material enters back into rotary kiln after shaft kiln top enters.Having combustor 7 in shaft kiln, this is common knowledge, is not described in detail.The shape of charging aperture and flue can be configured according to actual, at this and be not construed as limiting.
Material detector it is provided with in material transferring passage 2, can the be real-time material in material transferring passage be detected, whether there is material in checking material transferring passage.Rotary kiln 1 tail end connects exhaust emission pipeline 4, and this exhaust emission pipeline 4 other end is connected with shaft kiln 6, and i.e. this exhaust emission pipeline 4 one end is connected with rotary kiln 1 afterbody, the other end is connected with shaft kiln 6, obtains the tail gas in rotary kiln and can enter in shaft kiln.It is provided with prelum 3(on exhaust emission pipeline 4 or selects the negative pressure position of shaft kiln to be attached), it is ensured that tail gas enters in shaft kiln without pouring in down a chimney.Owing to tail gas containing substantial amounts of heat energy and reducing gas and dust, this part by recovery and is utilized in shaft kiln, serve the purpose saving resource.
Additionally, bottom is provided with discharging tower tray 5 in shaft kiln 6, can preferably carry out discharging, make material more uniformly, quickly enter into material transferring passage 4, and enter in rotary kiln.The sidewall of shaft kiln 6 is provided with blast pipe 10, and this blast pipe 10 is connected with aerator, and blast pipe 10 communicates with the combustor 7 in shaft kiln 6.
The head end of rotary kiln also is provided with seal closure equipped with kiln hood seal closure, tail end, it is ensured that sealing property.Also having the devices such as support roller in rotary kiln, this is the well-known components of rotary kiln, and in this not go into detail.
Low-grade iron ore is entered by the charging aperture of shaft kiln, and the dolomite or the limestone that together with iron ore of low ore grade and are added on demand by fuel (reducing agent, single coal or Mixture Density Networks) are mixed together and are put in shaft kiln by charging aperture simultaneously.Material is first heated in the combustor of shaft kiln, and iron ore, by high-temperature heating, evaporates surface water and water of crystallization, and starts primary reduction, in high-temperature region also by destroying the original phase structure of iron ore, has power-assisted sequential reduction and ore dressing.Iron ore in shaft kiln is in the air port through blast pipe, and temperature can drastically decline.Then in iron ore drops into material transferring passage again, and enter in rotary kiln.Owing to now entering, the iron ore in rotary kiln still has higher temperature heat, and mineral (Ore and the mixture of fuel), possibly together with a considerable amount of reducing agents (being determined by equation of heat balance), are conducive to the drastic reduction in rotary kiln.The heating relatively equalized in rotary kiln, keeps 1100 degree of-1170 degree and high reducing atmosphere more than 50 minutes, makes mineral fully be reduced.(heating process of rotary kiln is common knowledge, and in this not go into detail).The tail gas produced in rotary kiln, wherein contains the heat of higher temperature and reducing gas and dust, enters back in shaft kiln, this part has been made a recovery effect, has saved resource.Additionally due to the temperature selected is relatively low, the aluminium oxide in mine tailing etc. is not destroyed by high temperature, can comprehensive utilization further to mine tailing.
Claims (4)
1. a mixing kiln, it is characterized in that, described mixing kiln includes rotary kiln (1) and shaft kiln (6), shaft kiln top is provided with flue (8), shaft kiln bottom connects material transferring passage (2), this material transferring passage end connects with shaft kiln bottom, the other end connects with rotary kiln tail end, and shaft kiln top offers charging aperture (9), and rotary kiln head end is provided with discharging opening (11)；Described rotary kiln tail end connects exhaust emission pipeline (4), and this pipeline other end is connected with shaft kiln；Prelum (3) it is provided with on described exhaust emission pipeline.
Mixing kiln the most according to claim 1, it is characterised in that be provided with material detector in described material transferring passage.
Mixing kiln the most according to claim 2, it is characterised in that in described shaft kiln, bottom is provided with discharging tower tray (5).
4. according to the mixing kiln according to any one of claims 1 to 3, it is characterised in that the sidewall of described shaft kiln inner combustion chamber (7) is provided with blast pipe (10), and this blast pipe is connected with aerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410033058.6A CN103740928B (en) | 2014-01-24 | 2014-01-24 | A kind of mixing kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410033058.6A CN103740928B (en) | 2014-01-24 | 2014-01-24 | A kind of mixing kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103740928A CN103740928A (en) | 2014-04-23 |
| CN103740928B true CN103740928B (en) | 2016-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410033058.6A Expired - Fee Related CN103740928B (en) | 2014-01-24 | 2014-01-24 | A kind of mixing kiln |
Country Status (1)
| Country | Link |
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| CN (1) | CN103740928B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105369034A (en) * | 2015-11-02 | 2016-03-02 | 深圳金美威电子有限公司 | Reducing roasting method for iron ore |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555450U (en) * | 2009-11-11 | 2010-08-18 | 曾祥武 | Smelting device for smelting ferronickel by nickel oxide mines |
| CN203683618U (en) * | 2014-01-24 | 2014-07-02 | 深圳金美威电子有限公司 | Hybrid kiln |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS568894B2 (en) * | 1973-09-25 | 1981-02-26 |
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2014
- 2014-01-24 CN CN201410033058.6A patent/CN103740928B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555450U (en) * | 2009-11-11 | 2010-08-18 | 曾祥武 | Smelting device for smelting ferronickel by nickel oxide mines |
| CN203683618U (en) * | 2014-01-24 | 2014-07-02 | 深圳金美威电子有限公司 | Hybrid kiln |
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| Publication number | Publication date |
|---|---|
| CN103740928A (en) | 2014-04-23 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161005 Termination date: 20200124 |