CN103992049A - Cement clinker preparation method using converter steel slag to correct iron quality - Google Patents
Cement clinker preparation method using converter steel slag to correct iron quality Download PDFInfo
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- CN103992049A CN103992049A CN201410172685.8A CN201410172685A CN103992049A CN 103992049 A CN103992049 A CN 103992049A CN 201410172685 A CN201410172685 A CN 201410172685A CN 103992049 A CN103992049 A CN 103992049A
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- furnace slag
- grinding
- bessemer furnace
- cement clinker
- cement
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Abstract
The invention discloses a cement clinker preparation method using converter steel slag to correct iron quality. The preparation method comprises the following steps: 1) gradient grinding and magnetic separation; 2) mixing and grinding: a step of fully and uniformly mixing and grinding more than 0 wt% but no more than 5.4 wt% of converter steel slag with a cement raw material; and 3) calcining at a temperature of 1380 to 1400 DEG C so as to prepare the cement clinker. Directed at the characteristic that iron particles and difficult-to-grind phases like an RO phase in the converter steel slag are in the state of enrichment, the method provided by the invention carries out two-stage gradient grinding and sorts out iron particles and difficult-to-grind phases like the RO phase enriched in the converter steel slag by using a strong magnetic field, then the converter steel slag and the cement raw material are mixed, ground and calcined so as to prepare the cement clinker, so grinding efficiency of the cement raw material is improved, the service life of grinding equipment is prolonged, the converter steel slag is finer, the effect of seed induction of the converter steel slag is given to full play in the process of calcining of the cement clinker, the calcining temperature of cement is decreased by more than 50 DEG C, and the refined converter steel slag can adjust the aluminum rate (IM) in the cement raw material and functions as a mineralizer and a promoter.
Description
Technical field
The present invention relates to technology of producing cement, refer to particularly a kind of cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony.
Background technology
Cement is large with its output, purposes is wide, and is difficult to the singularity replacing and becomes the basic material of construction of infrastructure construction world wide in, and China's cement total output is over 2,000,000,000 tons at present, and manufacture of cement is very large to raw-material demand.
In cement slurry, mix slag and not only can reduce silica rate, obviously reduce f-CaO content, improve clinker quality, but also can reduce carrying capacity of environment, therefore, slag not only can be improved to cement performance for manufacture of cement a kind of resource utilization approach of efficient utilization is also provided for slag.Part of cement starts to use steel slag tailings to proofread and correct starting material calcining cement clinker as the irony of raw material in producing at present, but, because containing some difficult mill phases in slag, these difficult mills are mainly the metal oxide of divalence mutually, as: the unlimited solid solution that MgO, FeO, MnO etc. form, that is: RO phase, and Armco magnetic iron hydrochlorate mineral Ca
2(Al, Fe)
2o
5, that is: abrasive grit, makes slag grindability poor, thereby makes existingly to utilize slag to proofread and correct raw-material cement production process as irony to have following shortcoming: 1) cement slurry grinding efficiency is affected by slag and reduces; 2) grinding fineness is inadequate, and slag crystal seed effect performance is insufficient, poor stability.
Summary of the invention
Object of the present invention is exactly that a kind of cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony will be provided, and the method can improve mill efficiency, makes bessemer furnace slag fineness thinner, gives full play to its " induction crystal seed " effect, reduces cement firing temperature.
For achieving the above object, the technical solution used in the present invention is: a kind of cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony, comprises the following steps:
1) ladder grinding and magnetic separation: first, choose the bessemer furnace slag of 0 < particle diameter≤20mm, after grinding 15～20min, cross 4～6mm sieve, carry out one-level grinding, and utilize high-intensity magnetic field that the difficulty in the lower bessemer furnace slag of sieve is ground to phase magnetic separation and separate; Then, the bessemer furnace slag after sorting is continued to cross 1～3mm sieve after grinding 15～20min, carry out secondary grinding, and utilize high-intensity magnetic field that residual difficulty in the lower bessemer furnace slag of sieve is ground to phase magnetic separation and separate, the bessemer furnace slag after sorting is standby;
2) bessemer furnace slag mix grinding: by step 1) making is even by the proportioning of 0 < weight percent content≤5.4% and the abundant mix grinding of cement slurry;
3) calcining: the bessemer furnace slag after mix grinding and cement slurry mixture are calcined at 1380～1400 ℃ of temperature, can be made cement clinker.
Further, described step 1) in, in described one-level grinding, after bessemer furnace slag is ground, cross 4～5mm sieve; In described secondary grinding, after bessemer furnace slag is ground, cross 1～2.36mm sieve.
Further, described step 2) in, described bessemer furnace slag adds by the proportioning of 1.9 < weight percent content≤5.4%.
Further, described step 1) in, the difficulty mill in described bessemer furnace slag is abrasive grit or RO phase mutually.
Further, described step 2) in, described cement slurry is Wingdale, shale, and the mixture of sandstone.
Further, described step 1) in, adopt ball mill to grind, adopt high-gradient broadband magnetic separator to carry out magnetic separation.
Compared with prior art, tool of the present invention has the following advantages:
One, the present invention is directed to abrasive grit and the equal difficult feature that is mutually enrichment state of grinding of RO in bessemer furnace slag, by secondary ladder grinding process, and utilize high-intensity magnetic field that the abrasive grit of enrichment in slag and RO are equated to difficult mill sorts out mutually, after mix grinding, be fired into again cement clinker together with raw material, thereby improved raw grinding efficiency, extended milling equipment work-ing life, make bessemer furnace slag fineness thinner, make bessemer furnace slag can in burning clinker of cement process, give full play to " induction crystal seed " effect, cement firing temperature is reduced more than 50 ℃ than the conventional temperature of 1450 ℃ of left and right, and the aluminium rate (IM) in the adjustable raw material of the bessemer furnace slag of refinement, there is the effect of mineralizer and promotor.
Its two, the iron that bessemer furnace slag contains is with Fe
2o
3meter weight content can be up to 30% left and right, and the iron in bessemer furnace slag is when alternative ferro-controlling raw material is used for manufacture of cement, and refinement bessemer furnace slag granularity is conducive to save the natural resource such as Wingdale and sandstone, reduces production costs; Refinement bessemer furnace slag granularity is conducive to give full play to the activity of CaO, and in slag, high reactivity CaO can reduce CaCO relatively
3decompose institute's energy requirement, reduce heat consumption of clinker, reduce coal blending amount, active CaO can reduce CO simultaneously
2discharge, reach the object of energy-saving and emission-reduction.
They are three years old, in process of the present invention, bessemer furnace slag after secondary ladder grinding can also be got part and be directly used in the technique that cement kiln end feeds intake and carry out manufacture of cement, utilize slag can reduce the advantage of grog liquid phase formation temperature, improve the homogeneity of burn-ability and the clinker quality of grog, avoid occurring the phenomenon of local slag enrichment in burned grog.
Its four, utilize the inventive method to produce cement clinker and there are low abrasion, the advantage of high yield, the content of the magnetic substance metal oxide sorting out is high, has very high economic worth.
Accompanying drawing explanation
Fig. 1 is the cement clinker * 1000 microstructure image making in embodiment 1.
Fig. 2 is the cement clinker * 1000 microstructure image making in embodiment 2.
Fig. 3 is the cement clinker * 1000 microstructure image making in embodiment 3.
Fig. 4 is the cement clinker * 1000 microstructure image making in embodiment 4.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, be convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
Select Wingdale, shale, and sandstone is as cement slurry, and as the irony of raw material, proofread and correct starting material calcining cement clinker with bessemer furnace slag tailings, bessemer furnace slag volume fluctuates (slag also can be combined with other ferrous material as irony correction material) between 0～5.4wt%, wherein, the Wingdale of selecting, shale, sandstone, and the chemical composition of slag sees the following form 1:
| Starting material | LOSS | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | SO 3 | K 2O | Na 2O | R 2O |
| Wingdale | 41.68 | 3.70 | 1.84 | 0.44 | 49.45 | 1.09 | 0.09 | 0.64 | 0.09 | 0.51 |
| Shale | 10.62 | 54.36 | 11.00 | 7.07 | 6.22 | 4.01 | 0.03 | 4.00 | 1.20 | 3.83 |
| Sandstone | 7.21 | 79.00 | 4.01 | 6.45 | 1.22 | 0.44 | 0.05 | 0.28 | 0.24 | 0.42 |
| Slag | 9.27 | 10.27 | 3.43 | 24.08 | 40.48 | 9.38 | 0.23 | / | / | / |
Table 1
In addition, bessemer furnace slag with raw material blending before first carry out secondary ladder grinding, step is as follows:
First, choose the bessemer furnace slag tailings of 0 < particle diameter≤20mm and put into ball mill, grind 15～20min, preferably grind after 20min, cross 4～6mm sieve, the preferred 5mm sieve of crossing, carries out one-level grinding, screen overflow returns to ball mill, and utilizes high-gradient broadband magnetic separator that the abrasive grit in the lower bessemer furnace slag of sieve and the magnetic separation of the equal difficult mill phase of RO are separated; Then, bessemer furnace slag after sorting is continued at grinding in ball grinder 15～20min, preferably grind after 15min, cross 1～3mm sieve, preferably cross 2.36mm sieve, carry out secondary grinding, screen overflow returns to ball mill, and utilize high-gradient broadband magnetic separator that abrasive grit residual in the lower bessemer furnace slag of sieve and RO are equated to difficult and grind phase magnetic separation and separate, the particle diameter after sorting is less than the bessemer furnace slag of 2.36mm can be standby.
Embodiment 1
By the bessemer furnace slag after the secondary ladder grinding of 1.9wt%, the Wingdale of 80wt%, the shale of 15.2wt%, and the sandstone of 2.9wt% adds in raw mill mix grinding even together, grinding is to the fineness of conventional raw meal powder; Bessemer furnace slag after mix grinding and cement slurry mixture are entered to kiln and at 1400 ℃ of temperature, calcine, make corresponding cement clinker.
After testing, the f-CaO of cement clinker is 0.52%; By adding weight percentage, be that 2.5% sulphur trioxide adds desulfurated plaster, the clean slurry ruggedness test result of cement clinker as: 3d intensity is 62.9MPa, and 28d intensity is 74.7MPa; Cement clinker quality is even, does not occur local slag enrichment phenomenon, and its microstructure is shown in Fig. 1.
Embodiment 2
By the bessemer furnace slag after the secondary ladder grinding of 3wt%, the Wingdale of 79wt%, the shale of 15wt%, and the sandstone of 3wt% adds in raw mill mix grinding even together, grinding is to the fineness of conventional raw meal powder; Bessemer furnace slag after mix grinding and cement slurry mixture are entered to kiln and at 1400 ℃ of temperature, calcine, make corresponding cement clinker.
After testing, the f-CaO of cement clinker is 0.41%; By adding weight percentage, be that 2.5% sulphur trioxide adds desulfurated plaster, the clean slurry ruggedness test result of cement clinker as: 3d intensity is 63.8MPa, and 28d intensity is 77.3MPa; Cement clinker quality is even, does not occur local slag enrichment phenomenon, and its microstructure is shown in Fig. 2.
Embodiment 3
By the bessemer furnace slag after the secondary ladder grinding of 3.5wt%, the Wingdale of 77.8wt%, the shale of 17.1wt%, and the sandstone of 1.6wt% adds in raw mill mix grinding even together, grinding is to the fineness of conventional raw meal powder; Bessemer furnace slag after mix grinding and cement slurry mixture are entered to kiln and at 1400 ℃ of temperature, calcine, make corresponding cement clinker.
After testing, the f-CaO of cement clinker is 0.39%; By adding weight percentage, be that 2.5% sulphur trioxide adds desulfurated plaster, the clean slurry ruggedness test result of cement clinker as: 3d intensity is 62.7MPa, and 28d intensity is 77.4MPa; Cement clinker quality is even, does not occur local slag enrichment phenomenon, and its microstructure is shown in Fig. 3.
Embodiment 4
By the bessemer furnace slag after the secondary ladder grinding of 5.4wt%, the Wingdale of 77.3wt%, and the shale of 17.3wt% adds in raw mill mix grinding even together, grinding is to the fineness of conventional raw meal powder; Bessemer furnace slag after mix grinding and cement slurry mixture are entered to kiln and at 1400 ℃ of temperature, calcine, make corresponding cement clinker.
After testing, the f-CaO of cement clinker is 0.0%; By adding weight percentage, be that 2.5% sulphur trioxide adds desulfurated plaster, the clean slurry ruggedness test result of cement clinker as: 3d intensity is 69.5MPa, and 28d intensity is 84.8MPa; Cement clinker quality is even, does not occur local slag enrichment phenomenon, and its microstructure is shown in Fig. 4.
Compared to existing technology when utilizing slag to make irony correction starting material, by the direct grinding together with other material of steel slag tailings, the present invention has improved mill efficiency and the unit-hour output of raw material, make the thinner bessemer furnace slag of fineness can give full play to its " induction crystal seed " effect, reduce cement firing temperature.
Claims (6)
1. utilize bessemer furnace slag to proofread and correct a cement clinker preparation method for irony, comprise the following steps:
1) ladder grinding and magnetic separation: first, choose the bessemer furnace slag of 0 < particle diameter≤20mm, after grinding 15～20min, cross 4～6mm sieve, carry out one-level grinding, and utilize high-intensity magnetic field that the difficulty in the lower bessemer furnace slag of sieve is ground to phase magnetic separation and separate; Then, the bessemer furnace slag after sorting is continued to cross 1～3mm sieve after grinding 15～20min, carry out secondary grinding, and utilize high-intensity magnetic field that residual difficulty in the lower bessemer furnace slag of sieve is ground to phase magnetic separation and separate, the bessemer furnace slag after sorting is standby;
2) bessemer furnace slag mix grinding: by step 1) making is even by the proportioning of 0 < weight percent content≤5.4% and the abundant mix grinding of cement slurry;
3) calcining: the bessemer furnace slag after mix grinding and cement slurry mixture are calcined at 1380～1400 ℃ of temperature, can be made cement clinker.
2. the cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony according to claim 1, is characterized in that: described step 1), in described one-level grinding, after bessemer furnace slag is ground, cross 4～5mm sieve; In described secondary grinding, after bessemer furnace slag is ground, cross 1～2.36mm sieve.
3. the cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony according to claim 1 and 2, is characterized in that: described step 2), described bessemer furnace slag adds by the proportioning of 1.9 < weight percent content≤5.4%.
4. the cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony according to claim 1 and 2, is characterized in that: described step 1), the difficulty mill in described bessemer furnace slag is abrasive grit or RO phase mutually.
5. the cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony according to claim 1 and 2, is characterized in that: described step 2), described cement slurry is Wingdale, shale, and the mixture of sandstone.
6. the cement clinker preparation method who utilizes bessemer furnace slag to proofread and correct irony according to claim 1 and 2, is characterized in that: described step 1), adopt ball mill to grind, adopt high-gradient broadband magnetic separator to carry out magnetic separation.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446022A (en) * | 2014-12-18 | 2015-03-25 | 长沙紫宸科技开发有限公司 | Method for preparing steel slag sand, activated slag powder and RO phase from steel slag |
| CN104446058A (en) * | 2014-11-19 | 2015-03-25 | 济南大学 | Carbon dioxide mineralization preparation method of low-temperature calcined clinker and product thereof |
| CN104496228A (en) * | 2014-12-30 | 2015-04-08 | 中国建筑材料科学研究总院 | Road silicate cement clinker and preparation method thereof |
| CN107540250A (en) * | 2017-10-13 | 2018-01-05 | 武汉理工大学 | A kind of Pre-sorting slag split-phase clinker cement production technology |
| CN115925288A (en) * | 2022-12-27 | 2023-04-07 | 宝武环科武汉金属资源有限责任公司 | Method for preparing high-iron sulphoaluminate cement clinker by using large-dosage steel slag-desulfurized ash |
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| CN1785878A (en) * | 2004-12-12 | 2006-06-14 | 攀钢集团钢城企业总公司废旧物资分公司 | Method of using vanadium titanium rotary furnace steel slag as cement iron correction material |
| CN103641343A (en) * | 2013-12-02 | 2014-03-19 | 武汉理工大学 | Method for grinding preprocessing steel slag |
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2014
- 2014-04-28 CN CN201410172685.8A patent/CN103992049B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785878A (en) * | 2004-12-12 | 2006-06-14 | 攀钢集团钢城企业总公司废旧物资分公司 | Method of using vanadium titanium rotary furnace steel slag as cement iron correction material |
| CN103641343A (en) * | 2013-12-02 | 2014-03-19 | 武汉理工大学 | Method for grinding preprocessing steel slag |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446058A (en) * | 2014-11-19 | 2015-03-25 | 济南大学 | Carbon dioxide mineralization preparation method of low-temperature calcined clinker and product thereof |
| CN104446022A (en) * | 2014-12-18 | 2015-03-25 | 长沙紫宸科技开发有限公司 | Method for preparing steel slag sand, activated slag powder and RO phase from steel slag |
| CN104446022B (en) * | 2014-12-18 | 2016-06-08 | 长沙紫宸科技开发有限公司 | A kind of prepared from steel slag is for the method for Steel-slag Sand, activation ground-slag and RO phase |
| CN104496228A (en) * | 2014-12-30 | 2015-04-08 | 中国建筑材料科学研究总院 | Road silicate cement clinker and preparation method thereof |
| CN107540250A (en) * | 2017-10-13 | 2018-01-05 | 武汉理工大学 | A kind of Pre-sorting slag split-phase clinker cement production technology |
| CN115925288A (en) * | 2022-12-27 | 2023-04-07 | 宝武环科武汉金属资源有限责任公司 | Method for preparing high-iron sulphoaluminate cement clinker by using large-dosage steel slag-desulfurized ash |
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