CN104419434A - Method for manufacturing semicoke for sintering - Google Patents
Method for manufacturing semicoke for sintering Download PDFInfo
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- CN104419434A CN104419434A CN201310398284.XA CN201310398284A CN104419434A CN 104419434 A CN104419434 A CN 104419434A CN 201310398284 A CN201310398284 A CN 201310398284A CN 104419434 A CN104419434 A CN 104419434A
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- Prior art keywords
- semicoke
- sintering
- coal
- mass percent
- production method
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
Abstract
The invention discloses a method for manufacturing semicoke for sintering. A mixture comprises the following raw materials: 85%-90% of fault coal, 4%-10% of high-iron and low-silicon iron ore powder and 4%-8% of a binder. The method comprises the following steps: pressing and molding the mixture after evenly mixing; carrying out destructive distillation at 700-850 DEG C for 7-15 hours; and then carrying out dense-medium cleaning under the condition that the specific gravity of the dense medium is 1.3-1.4, so as to obtain semicoke for sintering. The semicoke produced by the method has the advantages of ferrocoke and semicoke, and is strong in chemical reactivity; the semicoke and coke powder are used in a mixed manner, so that the granularity structure of sintering fuel can be optimized, and the breathability of a sintering bed is improved; the used raw materials are fault coal, brown coal and high-volatile bituminous coal, so that the application range of metallurgical industry fuel is expanded, and the cost of the sintering fuel is reduced.
Description
Technical field
The invention belongs to ironmaking crude fuel production technical field, relate to the production technology of sintering fuel, particularly relate to a kind of production method of sintering semicoke.
Background technology
Sintering solid fuel used is coke powder or hard coal, and it enters factory's fuel granularity and is generally 0mm ~ 25mm, but sintering process is that 0 ~ 3 ㎜ should account for more than 85% to its granularity requirements.Because fuel coarsness proportion is large, makes combustion reactions slack-off, can not react synchronous with the mineralising in sintering process, amount of liquid phase in sintering process will be caused to reduce, sinter quality is declined.Therefore need to carry out fragmentation to fuel before SINTERING PRODUCTION, both required that coke powder and coal dust <3mm grade should account for more than 85%, could meet the needs of SINTERING PRODUCTION, this makes the cost of fine grinding fuel increase.
Semicoke (semi-coke) is commonly called as blue charcoal, gains the name, it is mud coal, solid product that the bituminous coal etc. of brown coal and high volatile obtains through low temperature (500 ~ 700 DEG C) destructive distillation because having very short blue flame when it burns.Semicoke has the characteristics such as high chemically reactive, high specific resistance, high fixed carbon, low ash, low-sulfur, low-phosphorous, low alchlor, but its strength ratio high temperature coke is poor, and volume density and true density are also low than high temperature coke.Semicoke volatile content is different because destructive distillation final temperature is different, is generally 10 ~ 20%.Half reactivity of coke generally measures by critical air blast volume method.Measured value is less, and reactivity is larger.The critical air air blast value average out to 0.017L/min of semicoke, high temperature coke then can reach 0.057L/min.Due to the difference of the aspect such as raw material and technique, the market value of semicoke is far below the price of general coke, if the market value of secondary metallurgical is at 2200 yuan/about t, and semicoke is at 750 yuan/about t, relatively low market value semicoke product the is possessed higher market competitiveness.
The major equipment that semicoke is produced is gas retort, and its basic demand of producing is that dry distillation efficiency is high, and even to heating material, available raw material types is wide, and feed coal particle size range is large, and volatile matter secondary pyrolysis is little, and operating process is convenient and reliable.Gas retort can be divided into external-heat and internal heat type 2 kinds by heat-supplying mode.The heat of external-heat stove supply coal charge is imported into by furnace wall outside, and because destructive distillation room and combustion chamber do not communicate, destructive distillation volatile matter does not mix mutually with combustion product gases, ensure that volatility product is not diluted, but because coal charge heating is uneven, causes semicoke quality uneven; In addition, too high humidity province exacerbates the secondary pyrolysis of volatility product, reduces tar yield.Internal heat type stove passes to coal charge by thermal barrier heat, because of its comparatively external-heat stove have the advantages such as homogeneous heating, thermo-efficiency are high, furnace binding is simple and be used widely.
Sinter high to the granularity requirements of fuel, reduce available stock, and need to carry out levigate process to fuel before use, make the production process time long, add production cost.Make full use of the feature that half reactivity of coke is high, and reduce <3mm grade proportion in sintering fuel simultaneously, not only can reduce fuel and fuel fine grinding cost, improve sinter quality, the low grade coals such as mud coal, brown coal and high-volatile hard coal also can be made to be applied to sintering, to have widened the scope of metallurgical coal.
Paper " thermogravimetric Analysis of coal-char combustion characteristic " is the combustioncharacteristics of semicoke by thermobalance experimental study, investigated coal to show with the test-results that affects of preparation temperature Semicoke Combustion Properties: coal is different, obtained coal-char combustion characteristic is different; Identical coal obtains semicoke, raises with preparation temperature, and semicoke kindling temperature rises, and combustive activation can increase, and combustion reactions activity reduces.
Chinese patent 200510048752.6 discloses a kind of method of low-quality brown coal production high-quality semicoke: with low-quality brown coal for raw material, obtain lignite semi-coke by destructive distillation, then obtain high-quality semicoke by dense medium washing.It is characterized in that add in reactor, temperature 800 DEG C, under 10 hours time condition, destructive distillation obtains lignite semi-coke with low-quality brown coal for raw material; Now lignite semi-coke ash content is 40% ~ 50%, fugitive constituent 12%, fixed carbon 53%, bomb calorific value is 18 ~ 20MJ/Kg about, then under medium proportion is 1.25 conditions, carry out dense medium gravity treatment, obtain ash content 13%, fugitive constituent 12%, fixed carbon 83%, the high-quality semicoke of bomb calorific value about 25 ~ 30MJ/Kg and the low-quality semicoke of remainder.It is high that the high-quality semicoke produced has fixed carbon content, the features such as thermal value is high, and ash content is low.But the semicoke physical strength that the method is produced is poor, and be easy to efflorescence, during for sintering, bed permeability is bad.
Summary of the invention
In order to overcome above-mentioned defect, the present invention proposes a kind of production method of sintering semicoke, produces a kind of chemically reactive stronger than coke, the novel semicoke particle that cost is lower than coke, optimizes sintering fuel Granularity Structure, widens metallurgical industry fuel use range.
For achieving the above object, the present invention takes following technical scheme:
A kind of production method of sintering semicoke, it is characterized in that following composition forms compound by mass percentage: low grade coal 85% ~ 90%, high iron low silicon powdered iron ore 4% ~ 10%, binding agent 4% ~ 8%, compound is mixed rear compression moulding, 700 DEG C ~ 850 DEG C destructive distillation 7 ~ 15 hours, be then carry out dense medium washing under the condition of 1.3 ~ 1.4 at dense medium proportion, obtain sintering semicoke.
In compound, low grade coal be one in mud coal, brown coal and high-volatile bituminous coal and more than; Binding agent is any one in pitch, coke tar refuse, cement and water glass.
High iron low silicon powdered iron ore, full weight of iron per-cent is TFe > 64%, SiO
2mass percent is SiO
2< 4%.
The semicoke produced, ash content mass percent is 12% ~ 14%, and volatile matter mass percent is 10% ~ 18%, and fixed carbon mass percent is 70% ~ 85%.
High-volatile bituminous coal, volatile matter mass percent V
ad> 27%.
Semicoke that the present invention produces, has the advantage of iron coke and semicoke, and chemical reactivity is strong, and semicoke is used in combination with coke powder, can optimize the Granularity Structure of sintering fuel, raising permeability of sintering material bed.Raw materials used is the bituminous coal of inferior mud coal, brown coal and high volatile, has expanded metallurgical industry fuel use range, has reduced sintering fuel cost.
Embodiment
The invention will be further described below:
Embodiment 1:
With brown coal, high iron low silicon powdered iron ore and binder pitch composition compound, wherein brown coal massfraction is 88%, high iron low silicon powdered iron ore massfraction 7%, mass fraction of asphalt is 5%, after being mixed by compound, with the compression moulding of pair roller ball press, with vertical interior hot stove destructive distillation 10 hours under 760 DEG C of conditions, then carry out dense medium washing, obtaining ash content is 12.4%, volatilization is divided into 10%, and fixed carbon content is the sintering semicoke of 77.6%.Wherein high iron low silicon powdered iron ore used and brown coal composition are as shown in Table 1 and Table 2.
Table 1 high iron low silicon powdered iron ore chemical composition/%
Table 2 brown coal technical analysis/%
When iron charge is consistent, carry out agglutinating test in following scheme with addition of fuel: (1) 75% coke powder (in coke powder <3mm ratio 50%) is with addition of 25% semicoke; , with addition of 35% semicoke, test-results is as shown in table 3 for (2) 65% coke powders (in coke powder <3mm ratio 40%).
Table 3 sintering experiment result
Embodiment 2:
With low grade coal (brown coal and bitumionus coal), high iron low silicon powdered iron ore and binder coke dregs of fat composition compound, wherein low grade coal massfraction is 90%, high iron low silicon powdered iron ore massfraction 5%, coke tar refuse massfraction is 5%, after compound is mixed, with the compression moulding of pair roller ball press, with vertical interior hot stove destructive distillation 12 hours under 800 DEG C of conditions, then dense medium washing is carried out, obtaining ash content is 11.6%, volatilization is divided into 8%, fixed carbon content is the sintering semicoke of 80.4%, wherein high iron low silicon powdered iron ore used is as shown in table 1, brown coal and bitumionus coal composition used is as shown in table 4.
Table 4 proximate analysis of coal/%
When iron charge is consistent, carry out agglutinating test in following scheme with addition of fuel: (1) 75% coke powder (in coal dust <3mm ratio 50%) is with addition of 25% semicoke; , with addition of 35% semicoke, test-results is as shown in table 5 for (2) 65% coke powders (in coke powder <3mm ratio 40%).
Table 5 sintering experiment result
Embodiment 3:
With low grade coal (mud coal, brown coal and bitumionus coal), high iron low silicon powdered iron ore and water glass of binder composition compound, wherein low grade coal massfraction is 85%, high iron low silicon powdered iron ore massfraction 8%, mass fraction of asphalt is 7%, after compound is mixed, with the compression moulding of pair roller ball press, with vertical interior hot stove destructive distillation 13 hours under 820 DEG C of conditions, then dense medium washing is carried out, obtaining ash content is 11.2%, volatilization is divided into 6%, fixed carbon content is the sintering semicoke of 82.8%, wherein high iron low silicon powdered iron ore used is as shown in table 1, brown coal and bitumionus coal composition used is as shown in table 6.
Table 6 proximate analysis of coal/%
When iron charge is consistent, carry out agglutinating test in following scheme with addition of fuel: (1) 75% coke powder (in coal dust <3mm ratio 50%) is with addition of 25% semicoke; , with addition of 35% semicoke, test-results is as shown in table 7 for (2) 65% coke powders (in coke powder <3mm ratio 40%).
Table 7 sintering experiment result
Claims (5)
1. the production method of a sintering semicoke, it is characterized in that following composition forms compound by mass percentage: low grade coal 85% ~ 90%, high iron low silicon powdered iron ore 4% ~ 10%, binding agent 4% ~ 8%, compound is mixed rear compression moulding, 700 DEG C ~ 850 DEG C destructive distillation 7 ~ 15 hours, be then carry out dense medium washing under the condition of 1.3 ~ 1.4 at dense medium proportion, obtain sintering semicoke.
2. the production method of sintering semicoke according to claim 1, is characterized in that in compound, low grade coal be one in mud coal, brown coal and high-volatile bituminous coal and more than; Binding agent is any one in pitch, coke tar refuse, cement and water glass.
3. the production method of sintering semicoke according to claim 1, is characterized in that high iron low silicon powdered iron ore, and full weight of iron per-cent is TFe > 64%, SiO
2mass percent is SiO
2< 4%.
4. the production method of sintering semicoke according to claim 1, is characterized in that the semicoke produced, and ash content mass percent is 12% ~ 14%, and volatile matter mass percent is 10% ~ 18%, and fixed carbon mass percent is 70% ~ 85%.
5. the production method of sintering semicoke according to claim 2, is characterized in that described high-volatile bituminous coal, volatile matter mass percent V
ad> 27%.
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| CN201310398284.XA CN104419434B (en) | 2013-09-05 | 2013-09-05 | Method for manufacturing semicoke for sintering |
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| CN201310398284.XA CN104419434B (en) | 2013-09-05 | 2013-09-05 | Method for manufacturing semicoke for sintering |
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| CN104419434B CN104419434B (en) | 2017-04-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105524673A (en) * | 2015-12-24 | 2016-04-27 | 四川德胜集团钒钛有限公司 | Sintering fuel and use method thereof |
| WO2018094885A1 (en) * | 2016-11-24 | 2018-05-31 | 武汉科思瑞迪科技有限公司 | Shaft furnace process for producing iron coke |
| JP2021006623A (en) * | 2019-06-27 | 2021-01-21 | Ｊｆｅスチール株式会社 | Method for producing ferro-coke molded product and method for producing ferro-coke |
| CN114231330A (en) * | 2022-01-13 | 2022-03-25 | 鞍钢股份有限公司 | High-calorific-value iron powder composite fuel and preparation method thereof |
| CN115029169A (en) * | 2022-04-28 | 2022-09-09 | 鞍钢股份有限公司 | Preparation method of sintered solid fuel |
Citations (3)
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| CN1850942A (en) * | 2006-05-26 | 2006-10-25 | 中国科学院山西煤炭化学研究所 | Method for preparing formed coke by adding adhesive using weak binding coal as main raw material |
| CN1869158A (en) * | 2005-12-27 | 2006-11-29 | 云南冶金集团总公司技术中心 | Method of producing high quality semicoke using low grade brown coal |
| EP2612894A1 (en) * | 2010-09-01 | 2013-07-10 | JFE Steel Corporation | Metallurgical coke production method |
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2013
- 2013-09-05 CN CN201310398284.XA patent/CN104419434B/en active Active
Patent Citations (3)
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| CN1869158A (en) * | 2005-12-27 | 2006-11-29 | 云南冶金集团总公司技术中心 | Method of producing high quality semicoke using low grade brown coal |
| CN1850942A (en) * | 2006-05-26 | 2006-10-25 | 中国科学院山西煤炭化学研究所 | Method for preparing formed coke by adding adhesive using weak binding coal as main raw material |
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Non-Patent Citations (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105524673A (en) * | 2015-12-24 | 2016-04-27 | 四川德胜集团钒钛有限公司 | Sintering fuel and use method thereof |
| WO2018094885A1 (en) * | 2016-11-24 | 2018-05-31 | 武汉科思瑞迪科技有限公司 | Shaft furnace process for producing iron coke |
| JP2021006623A (en) * | 2019-06-27 | 2021-01-21 | Ｊｆｅスチール株式会社 | Method for producing ferro-coke molded product and method for producing ferro-coke |
| JP7327293B2 (en) | 2019-06-27 | 2023-08-16 | Ｊｆｅスチール株式会社 | Method for producing molding for ferro-coke and method for producing ferro-coke |
| CN114231330A (en) * | 2022-01-13 | 2022-03-25 | 鞍钢股份有限公司 | High-calorific-value iron powder composite fuel and preparation method thereof |
| CN114231330B (en) * | 2022-01-13 | 2022-11-18 | 鞍钢股份有限公司 | High-calorific-value iron powder composite fuel and preparation method thereof |
| CN115029169A (en) * | 2022-04-28 | 2022-09-09 | 鞍钢股份有限公司 | Preparation method of sintered solid fuel |
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| CN104419434B (en) | 2017-04-26 |
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