CN102766764B - Production process for recycling bulk materials of chain grate machine - Google Patents
Production process for recycling bulk materials of chain grate machine Download PDFInfo
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- CN102766764B CN102766764B CN201210292215.6A CN201210292215A CN102766764B CN 102766764 B CN102766764 B CN 102766764B CN 201210292215 A CN201210292215 A CN 201210292215A CN 102766764 B CN102766764 B CN 102766764B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a production process for recycling bulk materials of a chain grate machine and solves problems of many produced waste materials, environmental pollution and unstable production qualities in existing bulk material recycle processes of chain grate machines. The technical scheme includes that the production process includes separately treating normal-temperature coarse particle bulk materials from an up-draught drying (UDD) section of the chain grate machine, dry coarse particle bulk materials from a down-draught drying (DDD) section, a temperature preheating (TPH) section and a preheating (PH) section, preheating coarse particle bulk materials from leakage materials of a spading plate of the chain grate machine and fine particle bulk materials from the sections according to characteristics of the bulk materials and doping the bulk materials with balling raw materials for balling. The production process is simple, free from generating bulk material wastes, environment-friendly, stable in recycling balling qualities, time-saving and labor-saving.
Description
Technical field
The present invention relates to the bulk cargo recovery process in a kind of field of metallurgy coal production, the production technique that a kind of drying grate bulk cargo is recycled specifically.
Background technology
A kind of high quality raw material that pellet is used as blast furnace, technology is constantly progressive, mainly take grate kiln production technique as main, China has the pellet production line of 58% left and right to adopt grate kiln technique, this production technique system is comprised of drying grate, rotary kiln, central cooler, and green-ball is dry on drying grate, in the process of preheating, and explosion inevitably occurs part green-ball, produce broken green-ball or dust, i.e. drying grate bulk cargo.
In drying grate-rotary kiln-circular cooler acid pellet production technique, dry and the preheating of green-ball divides four sections in drying grate, to complete, in drying grate, according to temperature, raise successively and be specifically divided into UDD dryer section (220 ℃ of left and right of temperature), DDD dryer section (360 ℃ of left and right of temperature), TPH transition preheating section (700 ℃ of left and right of temperature), PH preheating section (1100 ℃ of left and right of temperature), along with the rising of temperature, the intensity of the bulk cargo particle of each section of generation is also increased to about 800N/ by 10N/.Each section is that all can produce can be by the distinguished and admirable fine particle bulk cargo of taking away, and can not, by the distinguished and admirable coarse particles bulk cargo of taking away, also have in addition grate shovel flitch to leak the coarse particles bulk cargo that material produces.
In traditional technology, can be by the distinguished and admirable fine particle bulk cargo of taking away for drying grate, its particle diameter is all less than 0.5mm, can adopt respectively the modes such as bag-type dust, electric precipitation, multi-tube dusting to be trapped, and then by batching ash silo, allocates pelletizing raw materials recovery into and utilizes;
For not adopted the collection of collection ash silo, rotary conveyor to carry by the distinguished and admirable UDD dryer section of taking away, DDD dryer section and TPH transition preheating section coarse particles (particle diameter is more than or equal to 0.5mm), then by batching ash silo, directly allocate pelletizing raw materials recovery into and utilize;
For the coarse particles after the preheating that can not be spilt by the coarse particles of the distinguished and admirable PH preheating of taking away and grate shovel flitch, adopt rotary conveyor to collect, directly landing becomes waste material and sells at a bargain.
The problem that traditional technology exists is: the coarse particles bulk cargo 1) directly landing, can not be recycled utilization, and wasted ample resources, according to the output of 1.5 ten thousand tons of daily outputs, calculate, approximately produce 600 tons of coarse particles bulk cargo waste materials every day; 2) the coarse particles bulk cargo directly landing, owing to wherein still also having the middle fine particle of 70% left and right, so land or transport process in, very easily produce reentrainment of dust, had a strong impact on production environment; 3) for the coarse particles bulk cargo of directly allocating pelletizing raw material into, because the different sections of coarse particless that produce are without levigate, granularity is thicker, and specific surface area is less, and part bulk cargo granularity intensity is higher, temperature is uneven, having a strong impact on the raising of pelletizing quality and stablizing of subsequent production.
Summary of the invention
The object of the invention is in order to solve the problems of the technologies described above, provide a kind of technique simple, without bulk cargo generation of waste materials, the production technique that environmentally friendly, reuse pelletizing steady quality, time saving and energy saving drying grate bulk cargo are recycled.
Comprise normal temperature coarse particles bulk cargo from the UDD section of drying grate, from the dry raw particle bulk cargo of DDD section, TPH section and PH section, from grate shovel flitch, leak the preheating coarse particles bulk cargo of material, and from the fine particle bulk cargo of each section, described fine particle bulk cargo is recycled to batching ash silo by bag-type dust, electric precipitation or multi-tube dusting;
Described normal temperature coarse particles bulk cargo through Belt Conveying to the ash silo of preparing burden;
After described dry raw particle balk material collection, sending into tank adds water for cooling to 50 ℃ and is mixed with below the first ore pulp;
After described preheating coarse particles balk material collection, send into collection ash silo, then blanking adds water for cooling to 50 ℃ simultaneously and is made into below the second ore pulp;
Described the first ore pulp and the second ore pulp are all crossed 5mm and are sieved, and screen overflow lands and transfers to wet type ball crusher by wooden handcart, and screen underflow enters slag stock pump pond, more also sends into wet type ball crusher through slag stock pump; Ore pulp after wet type ball crusher is levigate through ceramic filter filter make its water-content be down to mass percent is processed after 10% below after bulk cargo be recycled to batching ash silo, fine particle material is loose, normal temperature coarse particles bulk cargo and processing afterwards coarse particles bulk cargo are mixed in pelletizing raw material for pelletizing.
What further, granularity was less than 0.075mm in bulk cargo after processing accounts for the more than 75% of bulk cargo total amount.
The mass percent that each component is mixed in pelletizing raw material (100%) is: bulk cargo 7～12% after fine particle bulk cargo 0～5%, normal temperature coarse particles bulk cargo 0～5%, processing.
The bulk cargo that contriver produces for drying grate conducts in-depth research and analyzes, find that the coarse particles bulk cargo producing in each section differs from one another, UDD section produces normal temperature coarse particles bulk cargo, the feature of this class bulk cargo is mainly manifested in: below the general 10N/ of intensity, temperature is room temperature, and water content is mass percent 10.5%; DDD section, TPH section and PH section produce dry raw particle bulk cargo, and its feature is mainly manifested in intensity, and at 10 N/, to about 300 N/, temperature is 200～650 ℃, and water content is 0%, and this class particle bulk cargo intensity is high, it is levigate to be difficult for; The preheating coarse particles bulk cargo that grate shovel flitch leaks material is the moulding pelletizing spilling substantially, and its particle diameter is large, is generally 0～16mm, and intensity is at about 800 N/, and temperature is 650 ℃ of >, and water content is 0%.
Processing for coarse particles bulk cargos such as differing temps, intensity should be treated with a certain discrimination, normal temperature coarse particles bulk cargo is substantially without the dry and warm to drying grate, its intensity is low, temperature is not high, later stage makes when material easy dispersion and becomes fine particle, therefore can be through Belt Conveying to the ash silo of preparing burden directly as granulating raw material, and dry raw particle bulk cargo is dry owing to having passed through, some parts have also been passed through warm, its temperature and intensity are higher, water content is low, and particle diameter is larger, are difficult for dispersion, if direct reuse will inevitably affect pelletizing quality, therefore must first add water and make its cooling preparation stop into ore pulp, the object that is mixed with ore pulp is for the ease of positive delivery on the one hand, reduces dust, on the other hand, be beneficial to the later stage coarse particles bulk cargo wet-milling high to intensity, simultaneously, for preheating coarse particles bulk cargo, no longer allow it directly land, but add when collecting after ash silo blanking again after being reclaimed together with the ore pulp that water is made into ore pulp and above-mentioned dry raw particle bulk cargo preparation, sieve, in order not affect conveying effect, by the method for screening, isolate and in ore pulp, contain granularity and be greater than 5mm coarse particles bulk cargo and adopt manually the mode of (wooden handcart) of passing on to transfer to wet type ball crusher to carry out wet ball-milling, for containing the ore pulp that is less than or equal to 5mm coarse particles bulk cargo after screening, by the mode of positive delivery, through pipeline, send into wet type ball crusher and carry out wet ball-milling.
Contriver, for the different characteristics of the bulk cargo of each section of generation of drying grate, has carried out corresponding early stage for different bulk cargos and has processed, and on the one hand all bulk cargos is all reclaimed, and without waste material, produces, and has greatly saved production cost; On the other hand when adding the mode of water for cooling and reduce bulk cargo temperature, the environmental problem that the workshop dust of also effectively avoiding is brought; And by the mode of screening, make most of bulk cargo deliver to wet type ball crusher by the method for positive delivery, only there is a small amount of large material bulk cargo to need man-handling of materials, thereby greatly reduced the amount of man-handling of materials, time saving and energy saving, by the different treatment method to different bulk cargos, the whole recovery bulk cargos that finally enter batching ash silo are remained in the scope of making material ingredient requirement on intensity, temperature and particle diameter, guarantee the stable of subsequent production; And contriver has further improved pelletizing quality after surprisingly finding to mix bulk cargo of the present invention in pelletizing raw material.Through predesigne, technique of the present invention is after improvement, according to the output of 1.5 ten thousand tons of daily outputs, calculate, can reduce man-handling of materials amount 300-600 ton every day, reduce the generation of 600 tons of waste materials, newly-increased pelletizing amount is 600 tons simultaneously, economic benefit is obvious, and factory occurs without dust problem substantially, and reuse bulk cargo pelletizing quality also further improves, before transformation, green-ball falls 3.3 times/0.5 meter ball left and right, after transformation at 4～5 times/0.5 meter ball; Compression strength of green pellet is increased to 8～9N/ ball by 7.78N/ ball left and right, and subsequent handling is produced stable.
Embodiment
Embodiment 1:
Think that pellet pelletizing is that example is described in detail below:
Drying grate starts, after normal work, the normal temperature coarse particles bulk cargo from drying grate UDD section to be collected and is delivered to batching ash silo through totally-enclosed rotary conveyor;
After the dry raw particle bulk cargo of the DDD section from drying grate, TPH section and PH section (can not by the distinguished and admirable coarse particles bulk cargo of taking away) is collected, sending into tank adds water for cooling to 50 ℃ and is mixed with below the first ore pulp;
After the preheating coarse particles bulk cargo (can not by the distinguished and admirable coarse particles bulk cargo of taking away) that leaks material from grate shovel flitch is collected, send into collection ash silo, then blanking adds water for cooling to 50 ℃ simultaneously and is made into below the second ore pulp;
From the fine particle bulk cargo of above-mentioned each section (can by the distinguished and admirable fine particle bulk cargo of taking away), described thin material is loose be recycled to batching ash silo by bag-type dust, electric precipitation or multi-tube dusting;
Described the first ore pulp and the second ore pulp all sieve by the linear vibrating screen of 5mm, and screen overflow lands and transfers to wet type ball crusher by wooden handcart, and screen underflow enters slag stock pump pond, more also send into wet type ball crusher through slag stock pump;
Ore pulp after wet type ball crusher is levigate filters its water-content is down to after mass percent (forms solid-state bulk cargo) below 10% through ceramic filter again, obtain processing rear bulk cargo and deliver to batching ash silo (what after described processing, in bulk cargo, granularity was less than 0.075mm accounts for the more than 75% of bulk cargo total mass), the mass percent that each component of reclaimed materials is mixed compared to pelletizing raw material (100%) is: fine particle bulk cargo 0～5%, normal temperature coarse particles bulk cargo 0～5%, process after bulk cargo 7～12%, routinely after technique pelletizing the performance of green-ball specifically referring to table 1.
Table 1, reclaimed materials incorporation embodiment and performance
Claims (2)
1. the production technique that a drying grate bulk cargo is recycled, comprise normal temperature coarse particles bulk cargo from the UDD section of drying grate, from the dry raw particle bulk cargo of DDD section, TPH section and PH section, from grate shovel flitch, leak the preheating coarse particles bulk cargo of material, and from the fine particle bulk cargo of each section, described fine particle bulk cargo is recycled to batching ash silo by bag-type dust, electric precipitation or multi-tube dusting; It is characterized in that,
Described normal temperature coarse particles bulk cargo through Belt Conveying to the ash silo of preparing burden;
After described dry raw particle balk material collection, sending into tank adds water for cooling to 50 ℃ and is mixed with below the first ore pulp;
After described preheating coarse particles balk material collection, send into collection ash silo, then blanking adds water for cooling to 50 ℃ simultaneously and is made into below the second ore pulp;
Described the first ore pulp and the second ore pulp are all crossed 5mm and are sieved, and screen overflow lands and transfers to wet type ball crusher by wooden handcart, and screen underflow enters slag stock pump pond, more also sends into wet type ball crusher through slag stock pump; Ore pulp after wet type ball crusher is levigate through ceramic filter filter make its water-content be down to mass percent processed after below 10% after bulk cargo be recycled to batching ash silo, bulk cargo mixes in pelletizing raw material for pelletizing by fine particle bulk cargo, normal temperature coarse particles bulk cargo and after processing, and the mass percent that each component is mixed in pelletizing raw material is: fine particle bulk cargo 0～5%, normal temperature coarse particles bulk cargo 0～5%, process after bulk cargo 7～12%.
2. the production technique that drying grate bulk cargo as claimed in claim 1 is recycled, is characterized in that, what after described processing, in bulk cargo, granularity was less than 0.075mm accounts for the more than 75% of bulk cargo total amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210292215.6A CN102766764B (en) | 2012-08-16 | 2012-08-16 | Production process for recycling bulk materials of chain grate machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210292215.6A CN102766764B (en) | 2012-08-16 | 2012-08-16 | Production process for recycling bulk materials of chain grate machine |
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| Publication Number | Publication Date |
|---|---|
| CN102766764A CN102766764A (en) | 2012-11-07 |
| CN102766764B true CN102766764B (en) | 2014-04-30 |
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| CN201210292215.6A Expired - Fee Related CN102766764B (en) | 2012-08-16 | 2012-08-16 | Production process for recycling bulk materials of chain grate machine |
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2012
- 2012-08-16 CN CN201210292215.6A patent/CN102766764B/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| "球团厂散料再利用的试验研究";甄彩玲;《武钢技术》;20091031;第47卷(第5期);23 * |
| "莱钢矿建60万吨氧化球团工程设计特点";元桂彬，等;《烧结球团》;20050228;第30卷(第1期);13 * |
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| CN102766764A (en) | 2012-11-07 |
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