GB2128180A - Method and apparatus for manufacturing cement of the Belite type - Google Patents
Method and apparatus for manufacturing cement of the Belite type Download PDFInfo
- Publication number
- GB2128180A GB2128180A GB08322166A GB8322166A GB2128180A GB 2128180 A GB2128180 A GB 2128180A GB 08322166 A GB08322166 A GB 08322166A GB 8322166 A GB8322166 A GB 8322166A GB 2128180 A GB2128180 A GB 2128180A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cooling
- cooler
- stage
- impact
- clinker
- 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.)
- Granted
Links
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910052918 calcium silicate Inorganic materials 0.000 title claims abstract description 19
- 235000012241 calcium silicate Nutrition 0.000 title claims abstract description 19
- 239000004568 cement Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000001816 cooling Methods 0.000 claims abstract description 57
- 239000002245 particle Substances 0.000 claims abstract description 19
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010298 pulverizing process Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 14
- 239000002699 waste material Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 235000012054 meals Nutrition 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000005549 size reduction Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002994 raw material Substances 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/345—Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
- C04B7/3453—Belite cements, e.g. self-disintegrating cements based on dicalciumsilicate
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Furnace Details (AREA)
Abstract
An active Belite cement clinker is sintered at 1350 DEG C-1450 DEG C and is cooled in two stages, with rapid cooling (quenching) e.g. in a fluidised bed being obtainable at the first stage and/or any necessary minimisation of the particle size to </= 10 mm diameter by impact pulverisation with simultaneous cooling and/or adjustment of the silicate module and/or alumina module, and subsequent cooling taking place at the second stage with normal cooling gradients. Preferably the high cooling gradient stage occurs within the range 1350 DEG C-1250 DEG C as the upper limit and 1000 DEG C-800 DEG C as the lower limit.
Description
SPECIFICATION
Method and apparatus for manufacturing cement of the Belite type
The invention relates to a method and apparatus for manufacturing cement of the Belite type, particularly the manufacture and cooling of the cement clinker.
It is known to manufacture active Belite cement. Appropriate methods of doing so are described inter alia in DD-WP 1 38 197,
DD-WP 139 938, and DD-WP 142 704.
In each case the purpose of the invention is to reach the cooling gradient > 500 K/min within a certain region and/or to provide conditions for reducing the cooling gradients.
This particularly includes obtaining clinker with a particle size < 10 mm, e.g. by supplying all the burnt clinker or only the over-sized particles thereof to a pulverising process for putting it to other use.
It has also already been proposed that rapid cooling should take place in an eddy channel cooler. For this purpose, however, it is necessary for the clinker to be simultaneously graded by multiple division of the air supply.
Another solution proposed is for ground-in materials at a substantially lower temperature to be added to the hot stream of clinker, and for the entire stream of material to be fed to a second cooling stage.
Another solution is to work with cooling gradients < 500 K/min when the silicate module is raised from 2 towards 4.
It has further been proposed to increase the early strength of the active Belite cement by having an optimum content of non sulfatebonded alkalis in the Belite clinker.
The early strength of active Belite cement can also be increased by grinding in EGR dust, raw meal, limestone and the like, and the process can be made altogether more economic.
The high cooling gradients can further be obtained industrially in a fall shaft cooler, the clinker being fractionated by a transverse air stream and the individual clinker fractions blown at according to their average particle diameter. The disadvantage is the need to have highly accurate blowing conditions in order to achieve long enough residence times in the fall shaft.
It is known from DE-OS 26 32 691 and
DE-OS 26 38 708 to add a marl material in the cooling region of a combustion installation (cooling zone in the furnace outlet, transitional area between furnace and cooler or in cooler), the marl material being burnt by the heat of the clinker and thereby itself taking on hydraulic properties.
The disadvantage of the above-mentioned solutions is the presupposition that the rapid cooling process is achieved only with small enough clinker particles.
As a means of removing this defect, hot pulverising of the clinker has been proposed, beginning at ~ 1 300 C, with simultaneous rapid cooling in an impact cooler. According to the invention the primary clinker particles size plays no part in the actual rapid cooling.
The disadvantage ;s the extremely high strain on the material through heat and attrition.
The invention aims to manufacture an active Belite clinker where development of strength, particularly the early strength of the active Belite cement, comes close to Portland cement and/or exceeds the late strength.
The problem underlying the invention is, through new solutions in combination with known or already proposed detailed solutions, to reduce the cooling gradient necessary for the quenching region by the effect of materials, and simultaneously to produce favourable conditions, particularly in respect of particle size, for obtaining high cooling gradients and for the ensuing size reduction of the clinker.
According to the present invention there is provided a method of manufacturing cement of the Belite type with a lime standard for the raw meal of 75 to 85 and a heating gradient corresponding to Portland cement production, in which the cement clinker is sintered at a temperature between 1 350 C and 1 450 C and cooled in stages with a high cooling gradient, preferably within the range between 1 350 C to 1 250 C as the upper limit and 1 000 C to 800"C as the lower limit, the cooling taking place in two stages, with rapid cooling e.g. in a fluidised bed being obtainable at the first stage, and/or any necessary minimisation of the particle size to ' 10 mm diameter by impact pulverisation with simultaneous cooling and/or adjustment of the silicate module and/or alumina module, and subsequent cooling taking place at the second stage with normal cooling gradients.
Cooling in the first stage (rapid cooling) may take place e.g. in a fluidised bed. A revolving tubular cooler may e.g. be used to cooling in the second stage.
Minimisation of the particle size to ' 10 mm is also obtained. For this purpose either the silicate module of approximately 2.0 to 2.5 in the raw material is increased towards 4.0 and preferably 3.0 and/or the alumina module is reduced to ~ 1. The independently formed coarse particles are separated from the clinker stream, reduced in size and fed to a further part of the process.
The process is further characterised, in that ground-in materials at substantially lower temperatures and in an appropriate particle fraction are fed into the hot clinker stream before or in the first cooling stage, e.g. in the fluidised bed.
An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawing, in which the single figure illustrates diagrammatically the individual assemblies for carrying out the process according to the present invention.
The burnt Belite clinker is fed from a revolving tubular furnace 1 at a temperature of over 1 300 C to an eddy channel cooler 2. The cooler 2 has air acting on it from below. In the cooler 2 the Belite clinker is cooled within the temperature range between 1 350'C to 1 250 C as the upper limit and 1 000 C to 800'C as the lower limit, with a cooling gradient 500.
The clinker is preferably fed into the cooler 2 with a particle size of less than 10 mm.
After this the clinker is cooled at normal cooling gradients. The cooling assembly used is particularly a revolving tubular cooler 5 or the like.
When part of the clinker has a particle 1 10 mm this is separate from the clinker stream. For this purpose the clinker is sent to a separating member 3, from which the fine particles are sent to the eddy channel cooler 2 and the coarse ones to an impact pulveriser 4.
According to the cooling effect in the impact pulveriser 4, to which cooling air is also supplied, the pulverised clinker is sent either to the eddy channel cooler 2 or direct to the second cooling stage, the revolving tubular cooler 5. The cooling air supplied to the cooler 5 is fresh air. Of the waste air from the cooler 5, part is sent through a waste air pipe to the eddy channel cooler 2 and/or via a waste air pipe 6 to the impact pulveriser 4. At the same time the requisite amount of fresh air is similarly fed to both assemblies through pipes 8 and 9. Some or all of the waste air from the first cooling stage is passed into the sintering stage, the revolving tubular furnace 1, bypassing the rapid cooling stage.
An important feature of the invention is also to minimise the proportion of clinker with a diameter 8 10 mm without mechanical size reduction, through the effect of materials.
It is already known that raising the silicate module from 2.0 to 2.5 in the direction preferably of 3, 4 helps to increase early strength and to lower the cooling gradient necessary for Belite clinker. However, it has been found unexpectedly that, with the same silicate module and the lime standard values typical for active Belite cement, a lowering of the alumina module to ~ 1 has a positive effect on the early strength of the cement and reduces the cooling gradient, while at the same time leading to the formation of smaller clinker particles than are known from Portland cement.
Given a Belite raw meal with the modules lime standard 80, silicate module 2.8 and allumina module 0.75 and with a sintering temperature of 1 350 C, the proportion of clinker particles larger than 10 mm will be less than 10%. The further embodiment of the method provides that, if ground-in materials (Zumahlstoffe) are added at substantially lower temperatures at the first cooling stage and/or in the region of the impact pulversation, and if quite cold air is supplied, the necessary cooling gradient will be obtained. The nett effect of self-pulverising of the granules, achieved by cooling at high cooling gradients, is advantageous.
This applies to the size of the granules during the further cooling process and also to the improvement in the subsequent transporting and grinding of the clinker.
In the drawing the path of the material is indicated by continuous lines and that of the air by broken lines.
Claims (11)
1. A method of manufacturing cement of the Belite type with a lime standard for the raw meal of 75 to 85 and a heating gradient corresponding to Portland cement production, in which the cement clinker is sintered at a temperature between 1350"C and 1450"C and cooled in stages with a high cooling gradient, preferably within the range between 1350"C to 1250 C as the upper limit and 1000"C to 800"C as the lower limit, the cooling taking place in two stages, with rapid cooling e.g. in a fluidised bed being obtainable at the first stage, and/or any necessary minimisation of the particle size to ~ 10 mm diameter by impact pulverisation with simultaneous cooling and/or adjustment of the silicate module and/or alumina module, and subsequent cooling taking place at the second stage with normal cooling gradients.
2. The method claimed in claim 1, in which ground-in materials are added before and/or during the first cooling stage, e.g. in the fluidised bed and/or the impact pulveriser, with substantially lower temperatures in a matching particle fraction.
3. The method claimed in claim 1, characterised in that only the oversized particles 1 10 mm diameter are separated from the stream of clinker and fed to the impact pulverising princess.
4. The method claimed in any one of claims 1 to 3, in which the silicate module is reduced from 2.0 to 2.5 in the direction of 4.0 and preferably 3 and/or the alumina module is reduced to less than 1.
5. The method claimed in any one of claims 1 to 4, in which waste air from the cooler at the second cooling stage and/or fresh air is supplied as cooling air to the fluidised bed cooling region and the impact cooling region, and all or part of the hot cooling air from the second stage is fed to the sintering process, bypassing the first stage.
6. An apparatus for carrying out the method claimed in any one of claims 1 to 5, comprising an impact pulveriser and/or an eddy channel cooler provided downstream of a revolving tubular furnace, and a second cooler, e.g. a revolving tubular cooler, arranged downstream of the eddy channel cooler.
7. An apparatus as claimed in claim 6, in which a separating member for the oversize particles of the clinker is arranged downstream of the revolving tubular furnace, said eddy channel cooler being connected to the separating member by a pipe for the fine particles, and to the- revolving tubular furnace by a pipe via an adjusting member or directly, a pipe for the oversize particles leading from the separating member to the impact pulveriser, and the eddy channel cooler and/or the impact pulveriser being connected to the downstream revolving tubular cooler by material pipes.
8. Apparatus as claimed in claim 6 or claim 7, in which waste air pipes connect the material inlet of the revolving tubular cooler to the eddy channel cooler and/or to the impact pulveriser, and fresh air pipes are connected to the waste air pipes via control members.
9. Apparatus as claimed in any one of claims 6 to 8, in which the base of the eddy channel cooler, which is pervious to air, is arranged sloping up to 20 and preferably 5 to 1 5,C to the horizontal, in the conveying direction of the material.
10. A method of manufacturing cement of the Belite type, substantially as hereinbefore described with reference to the accompanying drawings.
11. Apparatus for use in manufacturing cement of the Belite type, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD82243824A DD210675A1 (en) | 1982-10-06 | 1982-10-06 | METHOD AND ARRANGEMENT FOR PRODUCING CEMENT ACCORDING TO THE BELIT TYPE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8322166D0 GB8322166D0 (en) | 1983-09-21 |
| GB2128180A true GB2128180A (en) | 1984-04-26 |
| GB2128180B GB2128180B (en) | 1986-07-16 |
Family
ID=5541642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08322166A Expired GB2128180B (en) | 1982-10-06 | 1983-08-17 | Method and apparatus for manufacturing cement of the belite type |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5988348A (en) |
| AT (1) | AT383341B (en) |
| DD (1) | DD210675A1 (en) |
| DE (1) | DE3323565C2 (en) |
| DK (1) | DK158782C (en) |
| FR (1) | FR2538373B1 (en) |
| GB (1) | GB2128180B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005082802A1 (en) * | 2004-02-26 | 2005-09-09 | Fundacion Labein | Construction cement and method for the producing thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0514968U (en) * | 1991-05-21 | 1993-02-26 | サンクス株式会社 | Reflective photoelectric sensor |
| FR2951258B1 (en) | 2009-10-08 | 2012-09-07 | Fives Fcb | PROCESS FOR COOLING SOLID GRANULAR MATERIALS AND CONTINUOUS COOKING PLANT AS SUCH |
| JP2013184880A (en) * | 2012-03-12 | 2013-09-19 | Taiheiyo Cement Corp | Method and apparatus for cooling cement clinker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB938761A (en) * | 1959-12-31 | 1963-10-09 | Jerzy Grzymek | Method of producing dicalcium silicate clinker and/or products containing it |
| GB944127A (en) * | 1959-12-31 | 1963-12-11 | Jerzy Grzymek | Improvements in or relating to methods of producing portland cement and simultaneously obtaining alumina as by-product |
| GB1517819A (en) * | 1975-11-17 | 1978-07-12 | Francais Ciments | Process for the production of clinkers for white or grey cements |
| GB2013648A (en) * | 1978-02-06 | 1979-08-15 | Thaelmann Schwermaschbau Veb | A Process for the Manufacture of Cement |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2194921B1 (en) * | 1972-08-02 | 1974-12-27 | Fives Lille Cail | |
| DE2307165B2 (en) * | 1973-02-14 | 1976-03-25 | Claudius Peters Ag, 2000 Hamburg | METHOD AND DEVICE FOR DIRECT COOLING OF FINE-GRAIN TO COARSE-GRAIN PRODUCTS USING COOLING AIR |
| DD132999A1 (en) * | 1977-07-01 | 1978-11-22 | Gerhard Teichler | METHOD AND DEVICE FOR THE HEAT EXCHANGE OF SHOE TRAYS |
| DE2827568A1 (en) * | 1978-06-23 | 1980-01-10 | Peters Ag Claudius | Air cooling system for cement clinker - where dust free air leaving indirect cooler is fed up direct grate cooler to increase thermal efficiency |
| DD137578A1 (en) * | 1978-07-20 | 1979-09-12 | Ruediger Schramm | METHOD AND ARRANGEMENT FOR THE PREPARATION OF COMBUSTION GAS |
| DD142704A2 (en) * | 1979-04-06 | 1980-07-09 | Richard Schrader | PROCESS FOR PRODUCING CEMENT |
| DD150598A1 (en) * | 1980-05-12 | 1981-09-09 | Johannes Uhlmann | METHOD AND APPARATUS FOR PREPARING COMBUSTION |
| DD150883A1 (en) * | 1980-05-20 | 1981-09-23 | Jochen Stark | PROCESS FOR PRODUCING CEMENT |
-
1982
- 1982-10-06 DD DD82243824A patent/DD210675A1/en not_active IP Right Cessation
-
1983
- 1983-06-30 DE DE3323565A patent/DE3323565C2/en not_active Expired
- 1983-07-05 AT AT0246983A patent/AT383341B/en not_active IP Right Cessation
- 1983-08-17 GB GB08322166A patent/GB2128180B/en not_active Expired
- 1983-09-12 FR FR838314461A patent/FR2538373B1/en not_active Expired - Lifetime
- 1983-10-05 DK DK458483A patent/DK158782C/en active
- 1983-10-06 JP JP58186063A patent/JPS5988348A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB938761A (en) * | 1959-12-31 | 1963-10-09 | Jerzy Grzymek | Method of producing dicalcium silicate clinker and/or products containing it |
| GB944127A (en) * | 1959-12-31 | 1963-12-11 | Jerzy Grzymek | Improvements in or relating to methods of producing portland cement and simultaneously obtaining alumina as by-product |
| GB1517819A (en) * | 1975-11-17 | 1978-07-12 | Francais Ciments | Process for the production of clinkers for white or grey cements |
| GB2013648A (en) * | 1978-02-06 | 1979-08-15 | Thaelmann Schwermaschbau Veb | A Process for the Manufacture of Cement |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005082802A1 (en) * | 2004-02-26 | 2005-09-09 | Fundacion Labein | Construction cement and method for the producing thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5988348A (en) | 1984-05-22 |
| DD210675A1 (en) | 1984-06-20 |
| DK158782C (en) | 1991-01-14 |
| GB2128180B (en) | 1986-07-16 |
| ATA246983A (en) | 1986-11-15 |
| FR2538373A1 (en) | 1984-06-29 |
| DK158782B (en) | 1990-07-16 |
| DK458483D0 (en) | 1983-10-05 |
| DE3323565C2 (en) | 1986-08-07 |
| GB8322166D0 (en) | 1983-09-21 |
| DE3323565A1 (en) | 1984-04-12 |
| AT383341B (en) | 1987-06-25 |
| FR2538373B1 (en) | 1991-07-12 |
| DK458483A (en) | 1984-04-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940817 |