GB2084562A - Cement Setting Regulators - Google Patents
Cement Setting Regulators Download PDFInfo
- Publication number
- GB2084562A GB2084562A GB8129302A GB8129302A GB2084562A GB 2084562 A GB2084562 A GB 2084562A GB 8129302 A GB8129302 A GB 8129302A GB 8129302 A GB8129302 A GB 8129302A GB 2084562 A GB2084562 A GB 2084562A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium
- hydrate
- hemi
- sulphate dihydrate
- sulphite
- 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
- 239000004568 cement Substances 0.000 title claims abstract description 22
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims abstract description 48
- 235000010261 calcium sulphite Nutrition 0.000 claims abstract description 48
- 239000004295 calcium sulphite Substances 0.000 claims abstract description 48
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000725 suspension Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 239000002803 fossil fuel Substances 0.000 claims abstract description 7
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 7
- 239000010440 gypsum Substances 0.000 claims abstract description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 239000011575 calcium Substances 0.000 claims abstract description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 229910052925 anhydrite Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 26
- 239000000126 substance Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- 230000002411 adverse Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000011505 plaster Substances 0.000 claims description 2
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
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
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
- C04B22/145—Gypsum from the desulfuration of flue gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Flue gas evolved in the combustion of fossil fuels is treated with a calcium-containing suspension in a scrubber to form calcium sulphite hemi-hydrate which is partly oxidized by the addition of atmospheric oxygen to form a mixture of calcium sulphate dihydrate and calcium sulphite hemi- hydrate. This mixture is used in place of natural gypsum or anhydrite as a setting regulator in the manufacture of cement.
Description
SPECIFICATION
Use of a Mixture of Calcium Sulphite Hemi
Hydrate and Calcium Sulphate Dihydrate for the Manufacture of Cement
This invention relates to the use of a mixture of calcium sulphite hemi-hydrate and calcium sulphate dihydrate, the said mixture having been obtained in a flue gas desulphurization process in a composition of 1% to 99% of calcium sulphite hemi-hydrate, preferably 1% to 30% calcium sulphite hemi-hydrate and 1% to 99% calcium sulphate dihydrate, preferably 60% to 99% calcium sulphate dihydrate, wherein the flue gas evolved in the combustion of fossil fuels is treated with a calcium-containing suspension in a scrubber, during which process calcium sulphite hemi-hydrate is one of the substances forming and is partly oxidized, by the addition of atmospheric oxygen, to form calcium sulphate dihydrate, some of the suspension thus produced and containing calcium sulphite hemi-hydrate and calcium sulphate dihydrate among other substances is withdrawn from the scrubber circuit, fed to concentrators where it is extensively dehydrated, and then the solid having a limited residual moisture is removed from the circuit and the liquid is preferably returned to the scrubber, for the manufacture of cement.
In the manufacture of cement, gypsum is added as a setting retardant. This additive was previously ground into the cement clinker in the form of natural sypsum or natural anhydrite.
In view of the more stringent requirements of the clean air regulations, the treatment of flue gases evolved in the combustion of fossil fuels requires appropriate steps to reduce the sulphur content of such flue gases. They may be desulphurized in known manner by a wet desulphurization process. Depending upon the procedure, the resulting mixture contains calcium sulphite hemi-hydrate and calcium sulphate dihydrate in which the proportion of calcium sulphite hemi-hydrate can be controlled within specific parts by weight with respect to the total solids content.
In the manufacture of plaster for building purposes, the only products usable are those in which the calcium sulphite hemi-hydrate content is very much below 1%. To obtain a product of this kind from the wet flue gas desulphurization process requires a special procedure with appropriate apparatus. The wet flue gas desulphurization process is not always aimed at producing a high-sulphate product, but instead one which can be used for other purposes.
Experiments have shown that calcium sulphite hemi-hydrate can replace calcium sulphate dihydrate, hemi-hydrate or anhydrite in its function as a setting regulator in the manufacture of cement.
The object of this invention, therefore, is to use a mixture of calcium sulphite hemi-hydrate and calcium sulphate dihydrate as a setting regulator in the manufacture of cement, instead of the natural gypsum or natural anhydrate which was previousiy used.
To this end, the invention proposes the use of a mixture of calcium sulphite hemi-hydrate and calcium sulphate dihydrate in a composition of 1% to 99% calcium sulphite hemi-hydrate, preferably 1% to 30% calcium sulphite hemihydrate, and 1% to 99% calcium sulphate dihydrate, preferably 60% to 99% calcium sulphate dihydrate.
The advantages of the invention are that a product formed during the wet flue gas desulphurization process can be cost-effectively used in the manufacture of cement. Since the wet flue gas desulphurization process can be conducted in such a manner as to produce a calcium sulphite hemi-hydrate and calcium sulphate dihydrate mixture and the apparatus required is reduced, the flue gas desulphurization process becomes much more cost-effective. The use of such a product as an additive (setting regulator) in the manufacture of cement eliminates the need for any dumping, with its adverse effect on the environment, and it should be particularly stressed that environmentpolluting salts partially remain in the calcium sulphite hemi-hydrate/calcium sulphate dihydrate mixture, whereas in other processes these salts have to be discharged via effluent or dumping.
The use of this necessarily waste product also reduces the amount of natural crude gypsum that has to be quarried.
Claims
1. Use of a mixture of calcium sulphite hemihydrate and calcium sulphate dihydrate for the manufacture of cement, the said mixture having been obtained in a flue gas desulphurization process in a composition of 1% to 99% of calcium sulphite hemi-hydrate, preferably 1% to 30% calcium sulphite hemi-hydrate and 1% to 99% calcium sulphate dihydrate, preferably 60% to 99% calcium sulphate dihydrate, wherein the flue gas evolved in the combustion of fossil fuels is treated with a calcium-containing suspension in a scrubber, during which process calcium sulphite hemi-hydrate is one of the substances forming and is partly oxidized, preferably by the addition of atmospheric oxygen, to form calcium sulphate dihydrate, some of the suspension thus produced and containing calcium sulphite hemi-hydrate and calcium sulphate dihydrate among other substances is withdrawn from the scrubber circuit, fed to concentrators where it is extensively dehydrated, and then the solid having a limited residual moisture is removed from the circuit and the liquid is preferably returned to the scrubber.
2. Use of a mixture of calcium sulphite hemihydrate and calcium sulphate dihydrate as a setting regulator in the manufacture of cement, the mixture having a composition of 1% to 99%
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. Use of a mixture of calcium sulphite hemihydrate and calcium sulphate dihydrate for the manufacture of cement, the said mixture having been obtained in a flue gas desulphurization process in a composition of 1% to 99% of calcium sulphite hemi-hydrate, preferably 1% to 30% calcium sulphite hemi-hydrate and 1% to 99% calcium sulphate dihydrate, preferably 60% to 99% calcium sulphate dihydrate, wherein the flue gas evolved in the combustion of fossil fuels is treated with a calcium-containing suspension in a scrubber, during which process calcium sulphite hemi-hydrate is one of the substances forming and is partly oxidized, preferably by the addition of atmospheric oxygen, to form calcium sulphate dihydrate, some of the suspension thus produced and containing calcium sulphite hemi-hydrate and calcium sulphate dihydrate among other substances is withdrawn from the scrubber circuit, fed to concentrators where it is extensively dehydrated, and then the solid having a limited residual moisture is removed from the circuit and the liquid is preferably returned to the scrubber.
2. Use of a mixture of calcium sulphite hemihydrate and calcium sulphate dihydrate as a setting regulator in the manufacture of cement, the mixture having a composition of 1% to 99% calcium sulphite hem i-hydrate, preferably 1% to 30% calcium sulphite hem i-hydrate, and 1% to 99% calcium sulphate dihydrate, preferably 60% to 99% calcium sulphate dihydrate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803037056 DE3037056A1 (en) | 1980-10-01 | 1980-10-01 | USE OF A MIXTURE OF CALCIUM SULFIT SEMI-HYDRATE AND CALCIUM SULFATE DIHYDRATE FOR THE PRODUCTION OF CEMENT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2084562A true GB2084562A (en) | 1982-04-15 |
| GB2084562B GB2084562B (en) | 1984-03-07 |
Family
ID=6113333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8129302A Expired GB2084562B (en) | 1980-10-01 | 1981-09-29 | Cement setting regulators |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5788053A (en) |
| BE (1) | BE890558A (en) |
| DD (1) | DD201667A5 (en) |
| DE (1) | DE3037056A1 (en) |
| DK (1) | DK431681A (en) |
| FR (1) | FR2491054A1 (en) |
| GB (1) | GB2084562B (en) |
| GR (1) | GR75013B (en) |
| IE (1) | IE51795B1 (en) |
| IT (1) | IT1138682B (en) |
| LU (1) | LU83658A1 (en) |
| NL (1) | NL8104481A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59195560A (en) * | 1983-04-21 | 1984-11-06 | 日本セメント株式会社 | Manufacture of concrete products |
| DE3821657A1 (en) * | 1988-06-27 | 1989-12-28 | Rheine Kalkwerke Gmbh | METHOD FOR PRODUCING A BINDER AND ITS USE |
| DE59005950D1 (en) * | 1989-11-20 | 1994-07-07 | Wsz Wolfener Schwefelsaeure Un | METHOD FOR PRODUCING CEMENT CLINKER AND RECOVERY OF SULFUR DIOXIDE. |
| JP4775045B2 (en) * | 2006-03-14 | 2011-09-21 | 宇部興産株式会社 | Reducing gypsum composition, method for producing the same, cement-based solidifying material, and solidifying method |
| JP7406994B2 (en) * | 2020-01-08 | 2023-12-28 | Ｕｂｅ三菱セメント株式会社 | Method for manufacturing cement composition |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3855391A (en) * | 1973-01-23 | 1974-12-17 | Dravo Corp | Sludge stabilization with gypsum |
| SU563376A1 (en) * | 1975-03-10 | 1977-06-30 | Харьковский Ордена Ленина Политехнический Институт Им. В.И.Ленина | Expanding binding material |
-
1980
- 1980-10-01 DE DE19803037056 patent/DE3037056A1/en not_active Ceased
-
1981
- 1981-09-29 DK DK431681A patent/DK431681A/en not_active Application Discontinuation
- 1981-09-29 GB GB8129302A patent/GB2084562B/en not_active Expired
- 1981-09-30 GR GR66169A patent/GR75013B/el unknown
- 1981-09-30 LU LU83658A patent/LU83658A1/en unknown
- 1981-09-30 BE BE0/206114A patent/BE890558A/en not_active IP Right Cessation
- 1981-09-30 FR FR8118455A patent/FR2491054A1/en not_active Withdrawn
- 1981-10-01 IE IE2280/81A patent/IE51795B1/en unknown
- 1981-10-01 NL NL8104481A patent/NL8104481A/en not_active Application Discontinuation
- 1981-10-01 JP JP56154891A patent/JPS5788053A/en active Pending
- 1981-10-01 DD DD81233790A patent/DD201667A5/en unknown
- 1981-10-01 IT IT24262/81A patent/IT1138682B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2491054A1 (en) | 1982-04-02 |
| JPS5788053A (en) | 1982-06-01 |
| IE812280L (en) | 1982-04-01 |
| IE51795B1 (en) | 1987-04-01 |
| GR75013B (en) | 1984-07-12 |
| BE890558A (en) | 1982-01-18 |
| IT8124262A0 (en) | 1981-10-01 |
| DK431681A (en) | 1982-04-02 |
| DD201667A5 (en) | 1983-08-03 |
| NL8104481A (en) | 1982-05-03 |
| IT1138682B (en) | 1986-09-17 |
| DE3037056A1 (en) | 1982-04-22 |
| GB2084562B (en) | 1984-03-07 |
| LU83658A1 (en) | 1982-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |