CN1300270A - Method for improving grindability of cement aggregates - Google Patents
Method for improving grindability of cement aggregates Download PDFInfo
- Publication number
- CN1300270A CN1300270A CN00800600A CN00800600A CN1300270A CN 1300270 A CN1300270 A CN 1300270A CN 00800600 A CN00800600 A CN 00800600A CN 00800600 A CN00800600 A CN 00800600A CN 1300270 A CN1300270 A CN 1300270A
- Authority
- CN
- China
- Prior art keywords
- cement
- thermal treatment
- slag
- grinding
- grindability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 20
- 239000002893 slag Substances 0.000 claims abstract description 29
- 238000000227 grinding Methods 0.000 claims abstract description 23
- 238000007669 thermal treatment Methods 0.000 claims description 15
- 239000013078 crystal Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims 1
- 230000003179 granulation Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 description 13
- 230000006835 compression Effects 0.000 description 13
- 238000005259 measurement Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011400 blast furnace cement Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007908 dry granulation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
In order to improve grindability and regulate the hydraulic properties of cement aggregates, especially slags, soots or pozzolans, the cement aggregates are subjected to a treatment at temperatures ranging between 350 DEG C and 1000 DEG C before undergoing grinding.
Description
The present invention relates to the method that a kind of improvement cement is mixed the grindability of mill thing, particularly slag, quick ash or pozzuolana and regulated base hydraulicity matter.
Slag cement, particularly blast-furnace cement or slag cement are all made through grinding by slag sand, and use as the mill thing of mixing of cement mixing as a rule.Been reported, the grindability when grinding is improved by chemical additive and the particularly grinding aid by gained, but this grinding aid will constitute impurity in triturate.Equally once report, hydraulic character, behavior and the accessible ultimate compression strength of particularly hardening can be added to the influence of chemical additive in the cement or that add in some scheduled time when making concrete.
Therefore, the objective of the invention is to, cement is mixed the grindability of mill thing, under prerequisite not, improved or exert one's influence sometimes and to its hydraulic character by means of this class chemical additive.In order to reach this purpose, the essence of the inventive method is that cement is mixed the mill thing and heat-treated under 250 ℃-1000 ℃ before grinding operation.Be surprised to find that particularly the Mechanical Crushing of blast furnace slag particle has tangible improvement under this thermal treatment.In this case, in the scope of the modification essence upper bound between so-called glass strain elimination temperature and Tc, once showed therebetween, handled to make grinding of needing to reduce about 20% in about 1 hour at about 500 ℃ down.But unexpectedly find, in this temperature range, can make grinding and to reduce of needing, also be affected representing of hydraulic character, particularly intensity simultaneously by thermal treatment.Handling the blast furnace slag charge under about 500 ℃ temperature, that grinding of needing can be reduced is about 20%, makes 28 days-ultimate compression strength increase about 15% simultaneously.Under higher temperature, handle, particularly for example handle down, grind and can also can obviously reduce, and find that required grinding can reduce half at about 900 ℃, however the ultimate compression strength step-down after processing can make 7 days and 28 days under this about 900 ℃ temperature.Requiredly grind the linear change that not to cause the ultimate compression strength and the hydraulicity with the minimizing of handling temperature, but the delayed setting in cement mix process wishes that sometimes this can only just can reach by chemical additive in usual manner.
Advantageously the thermal treatment of the inventive method is at 300 °-900 ℃, particularly carry out at 300 °-700 ℃, at this moment in this temperature range, required grinding can approximately can be reduced half, and in this preferred temperature range, ultimate compression strength after 28 days approximately can raise 20 ℃, if this heat treated blast furnace slag after grinding operation or in its process with the mixed of portland cement by 1: 1.In addition, the improvement of the grindability of the component after this processing also makes the grindability of the mixture of the blast furnace slag mud after portland cement clinker and the processing improve, like this, the required energy that grinds is reduced, in other words, can be observed higher grinding rate required grinding under the identical situation of energy.
The particularly advantageous embodiment of the inventive method is that heat treatment period is between 15 minutes-3 hours, preferred 45 minutes-2 hours.The desired temperature of thermal treatment, particularly under the situation that adopts blast furnace slag, the waste heat by BF Area provides as a rule.The optional short treatment time when treatment temp is higher.For example can utilize the waste-heat recovery device of blast furnace.Thermal treatment itself can be carried out in different occasions; but thermal treatment should directly be undertaken by delayed quench with the waste heat of making particle after granulating; at this moment expection the influence of slag amount or the reduction that grinds merit can particularly be reached by the residence time in the dry granulation process and temperature controlled adjusting by the simple adjustment of standard method of granulating or granulating method.But blast furnace slag also can improve afterwards, and sends into and carry out subsequent heat treatment in the drying installation.At last, particular processing equipment can be set before the slag masher, for example utilize the waste heat of clinker cooler simultaneously, another kind of therebetween method can be put into blast furnace slag to handling suitable temperature window in cement tube stove clinker cooler district.At last, can improve the temperature that grinds of blast furnace slag.
Except early age strength of concrete being had the possibility that influences below and making grog with more economical ground of the slag ground possibility by the grindability that improves the blast furnace slag component, also there is change and adjusts the possibility that complex cement characteristic intensity represents, for example 28 days-hardness reduction and early hardness are improved.A kind of like this operating method can reach by the fineness that improves slag, and the fineness of slag can obtain with particularly being ground by slag and grog by improving grindability.
Cement is mixed the mill thing and can cooled off in air in simple especially mode after the thermal treatment and before grinding operation, and the processing of blast furnace slag therebetween should be carried out below about 850 ℃ melilith-Tc.
Intensity level especially significantly improves and occurs under the situation below, if it undertaken by a kind of preferred further mode of development, i.e. thermal treatment 250 ℃ between about 700 ℃ crystal seed formation temperature, particularly under about 500 ℃, carry out.
The present invention below will be further elaborated by accompanying drawing.Fig. 1 represents to be right after the thermal treatment changing conditions of ultimate compression strength afterwards, and Fig. 2 represents the changing conditions of bending strength under the various treatment temps, and Fig. 3 represents the required situation that can reduce that grinds under the various treatment temps.
In the examples of implementation that accompanying drawing is set forth, carried out a series of additional surveies, particularly the thermodynamics of the crystal seed formation temperature of the melilith phase that in most cases occurs and Tc measure, according to Blaine by laser diffraction or size test to the mensuration of fineness of grinding and according to the measurement of the mortar prism of -standard B 3310 usefulness 50% slag share WC (water/cement)-value 0.6 to hydraulically active.Reference studies show that, forming after finishing in crystallization is negatively influencing to Strength Changes, and this negative Strength Changes forms at crystal seed and finishes reference diffractometer measurement afterwards and show that glass content does not change yet.The treatment temp step-length that research is adopted is 100 °, and it the results are shown in Fig. 1.Fig. 1 represents the change procedure of ultimate compression strength under the various treatment temps, and wherein slag-cement ratio is elected 50: 50 as.As can be seen from Figure 1, Strength Changes, particularly 28 days intensity have tangible improvement in temperature range 400-600 ℃.Yet 900 ℃ of measurement point shown in Figure 1 are under-represented, because its grindability improvement is very big in this test, no longer observe the constant fineness 4500cm that keeps in other test
2/ g.Clearly improved grindability makes fineness reach 6700cm in this case
2/ g.
Thermodynamic study to a kind of blast furnace slag shows, the peak temperature that crystal seed forms is 710 ℃, and the melilith crystallization is 850 ℃, and follow-up crystallization is that the peak temperature of 900 ℃ and eutectic eutectic is 1190 ℃.Heat analysis determines that even melts is at 1330 ℃.
Blast furnace slag is handled in a kind of box-type furnace, and in each treatment temp that Fig. 1 represents, the treatment time is 1 hour.After treatment time finishes slag is taken out from stove and in air, cool off.
Grinding in ball mill of the blast furnace slag of Chu Liing carried out in this way, grinds progress and always determined by Blaine one diameter measurement.
From the changing conditions of ultimate compression strength shown in Figure 1 as can be seen, in about 500 ℃ temperature range, its ultimate compression strength is significantly increased.The temperature that the maximum value of the ultimate compression strength after 28 days occurs is higher than the temperature that the early strength maximum value occurs.Like this, thermal treatment is directed at the difference of the intensity of determining time point, in this way, generally speaking can regulate the hydraulicity in wide scope.
Can be observed hydraulically active (particularly 28 days ultimate compression strength) after the scope above crystal seed formation temperature and Tc (about 700 ℃) reduces.It is once unexpected that discovery handled under comparatively high temps, and increasing also appears in 2 days ultimate compression strength.
As mentioned above, the measurement point under 900 ℃ of Fig. 1 is under-represented, because the fineness of grinding in this test is much higher.
Equally, bending strength also obviously is subjected to heat treated influence.Bending strength under the various treatment temps shown in Figure 2 changes that slag-cement is 50: 50 than still in the pairing sample, and is for the measurement point under 900 ℃, still effective about the explanation of fineness of grinding above.Can observe bending strength has the tendency of decline slightly before reaching Tc, and significantly descending only just appears after surpassing Tc in bending strength.
Bending strength and ultimate compression strength in the early strength scope are expressed similar curvilinear motion, thereby allow once more the hydraulic character of the expection of the finished product is done big adjustment.
At last, under the temperature of being studied grindability is measured, it the results are shown in Fig. 3.Can obviously find out relation between the time of grinding and the selected treatment temp from Fig. 3, with the rising of handling temperature, through about 4500cm
2The time that grinds of the Blaine fineness of/g sharply reduces.Under this condition, the observed value that occurs under 900 ℃ the temperature is not exclusively correct, because fineness of grinding has reached 6700cm on this time point
2/ g, and 4500cm
2The Blaine fineness of/g but occurs before this already.Fineness of grinding is in addition by comparing with 45 μ m sieve (R45) monitoring residue, this measurement the results are shown in following table.
| Treatment temp | Grind the time | Grind the time | ????Blaine | ????R45 |
| ????(℃) | ????(min) | ????(％) | ??(cm 2/g) | (weight %) |
| 20 (reference value) | ????270 | ????100 | ????4700 | ????1.27 |
| ????300 | ????230 | ????85 | ????4600 | ????0.57 |
| ????400 | ????225 | ????83 | ????4500 | ????0.83 |
| ????500 | ????225 | ????83 | ????4500 | ????0.53 |
| ????600 | ????215 | ????80 | ????4500 | ????0.57 |
| ????700 | ????210 | ????78 | ????4600 | ????0.57 |
| ????900 | ????180 | ????67 | ????4700 | ????8.87 |
R45 measures and the result of determination of laser diffraction size-grade distribution shows that along with the raising of crystalline substance share, obvious variation appears in the characteristic size-grade distribution of slag.
Therefore, generally speaking, under 300-500 ℃, heat-treat can save about 15% grind can, in crystal seed formation temperature scope, can reduce approximately 20%, in case crystal composition occurs, the time that grinds will significantly descend once more.
Claims (7)
1. one kind is improved the method that cement is mixed the grindability of mill thing, particularly slag, quick ash or pozzuolana and regulated its hydraulic character, it is characterized in that, cement is mixed the mill thing and stood 250 ℃-1000 ℃ thermal treatment before being ground operation.
2. the method for claim 1 is characterized in that, this thermal treatment temp is 300 ℃-900 ℃, particularly 300-700 ℃.
3. claim 1 or 2 method is characterized in that this heat treatment time is 15 minutes-3 hours, is preferably 45 fens-2 hours.
4. claim 1,2 or 3 method is characterized in that, this cement is mixed the mill thing and cooled off in air after the thermal treatment He before grinding operation.
5. the method for one of claim 1-4 is characterized in that, the processing of blast furnace slag is carried out below about 850 ℃ melilith-Tc.
6. the method for one of claim 1-5 is characterized in that, thermal treatment is particularly carried out about 500 ℃ between 250 ℃ and about 700 ℃ crystal seed formation temperature.
7. the method for one of claim 1-6 is characterized in that, thermal treatment directly is right after granulation process and makes under the particulate waste heat with utilization by delayed quench to be carried out.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT25099 | 1999-04-15 | ||
| ATGM250/99 | 1999-04-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1300270A true CN1300270A (en) | 2001-06-20 |
Family
ID=3485554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00800600A Pending CN1300270A (en) | 1999-04-15 | 2000-04-14 | Method for improving grindability of cement aggregates |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP1087917A1 (en) |
| JP (1) | JP2002542140A (en) |
| KR (1) | KR20010052838A (en) |
| CN (1) | CN1300270A (en) |
| AU (1) | AU3945200A (en) |
| BG (1) | BG105095A (en) |
| BR (1) | BR0006046A (en) |
| CA (1) | CA2333415A1 (en) |
| CZ (1) | CZ200199A3 (en) |
| HU (1) | HUP0103322A3 (en) |
| ID (1) | ID27021A (en) |
| MA (1) | MA25435A1 (en) |
| SK (1) | SK19162000A3 (en) |
| WO (1) | WO2000063133A1 (en) |
| ZA (1) | ZA200006775B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5727168B2 (en) * | 2010-07-26 | 2015-06-03 | 株式会社太平洋コンサルタント | Method for reducing hydrogen gas caused by blast furnace cement |
| JP6195460B2 (en) * | 2013-03-26 | 2017-09-13 | デンカ株式会社 | Method for producing anti-bleeding agent for concrete and method for producing cement composition containing the anti-bleeding agent for concrete |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1985526A (en) * | 1933-08-11 | 1934-12-25 | Dicalite Company | Heat treatment of diatomaceous earth |
| JPH0784337B2 (en) * | 1988-09-30 | 1995-09-13 | 三菱重工業株式会社 | Fly Ash treatment method |
| SU1729585A1 (en) * | 1990-05-10 | 1992-04-30 | Казахский политехнический институт им.В.И.Ленина | Method of grinding high-abrasive metallurgical slags |
| NO305896B1 (en) * | 1996-04-17 | 1999-08-16 | Elkem Materials | Method of treating silica-containing material |
-
2000
- 2000-04-14 EP EP00918559A patent/EP1087917A1/en not_active Withdrawn
- 2000-04-14 CZ CZ200199A patent/CZ200199A3/en unknown
- 2000-04-14 KR KR1020007014168A patent/KR20010052838A/en not_active Application Discontinuation
- 2000-04-14 JP JP2000612231A patent/JP2002542140A/en active Pending
- 2000-04-14 BR BR0006046A patent/BR0006046A/en not_active IP Right Cessation
- 2000-04-14 SK SK1916-2000A patent/SK19162000A3/en unknown
- 2000-04-14 AU AU39452/00A patent/AU3945200A/en not_active Abandoned
- 2000-04-14 CA CA 2333415 patent/CA2333415A1/en not_active Abandoned
- 2000-04-14 CN CN00800600A patent/CN1300270A/en active Pending
- 2000-04-14 ID ID20010106A patent/ID27021A/en unknown
- 2000-04-14 HU HU0103322A patent/HUP0103322A3/en unknown
- 2000-04-14 WO PCT/AT2000/000089 patent/WO2000063133A1/en not_active Application Discontinuation
- 2000-11-20 ZA ZA200006775A patent/ZA200006775B/en unknown
- 2000-12-12 MA MA26117A patent/MA25435A1/en unknown
- 2000-12-27 BG BG105095A patent/BG105095A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HUP0103322A3 (en) | 2002-11-28 |
| EP1087917A1 (en) | 2001-04-04 |
| ID27021A (en) | 2001-02-22 |
| KR20010052838A (en) | 2001-06-25 |
| SK19162000A3 (en) | 2001-09-11 |
| BG105095A (en) | 2001-07-31 |
| BR0006046A (en) | 2001-03-13 |
| JP2002542140A (en) | 2002-12-10 |
| WO2000063133A1 (en) | 2000-10-26 |
| CZ200199A3 (en) | 2002-03-13 |
| MA25435A1 (en) | 2002-07-01 |
| AU3945200A (en) | 2000-11-02 |
| ZA200006775B (en) | 2002-02-20 |
| CA2333415A1 (en) | 2000-10-26 |
| HUP0103322A2 (en) | 2001-12-28 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |