IE51795B1 - Use of a mixture of calcium sulphite hemi-hydrite and calcium sulphate dihydrate for the manufacture of cement - Google Patents
Use of a mixture of calcium sulphite hemi-hydrite and calcium sulphate dihydrate for the manufacture of cementInfo
- Publication number
- IE51795B1 IE51795B1 IE2280/81A IE228081A IE51795B1 IE 51795 B1 IE51795 B1 IE 51795B1 IE 2280/81 A IE2280/81 A IE 2280/81A IE 228081 A IE228081 A IE 228081A IE 51795 B1 IE51795 B1 IE 51795B1
- Authority
- IE
- Ireland
- Prior art keywords
- calcium
- hemi
- hydrate
- sulphite
- sulphate dihydrate
- Prior art date
Links
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 title claims abstract description 26
- 235000010261 calcium sulphite Nutrition 0.000 title claims abstract description 26
- 239000004295 calcium sulphite Substances 0.000 title claims abstract description 26
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 20
- 239000000203 mixture Substances 0.000 title claims abstract description 19
- 239000004568 cement Substances 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 239000002803 fossil fuel Substances 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000001301 oxygen Substances 0.000 claims abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 235000011132 calcium sulphate Nutrition 0.000 claims description 2
- 239000001175 calcium sulphate Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229910052602 gypsum Inorganic materials 0.000 abstract description 5
- 239000010440 gypsum Substances 0.000 abstract description 5
- 229910052925 anhydrite Inorganic materials 0.000 abstract description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- VCSZKSHWUBFOOE-UHFFFAOYSA-N dioxidanium;sulfate Chemical compound O.O.OS(O)(=O)=O VCSZKSHWUBFOOE-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000002699 waste 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
- C04B7/38—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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (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
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 17. to 997. of calcium sulphite hemi-hydrate, preferably 17. to 307, calcium sulphite hemi-hydrate and 17. to 997. calcium sulphate dihydrate, preferably 607, to 997. 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 gypsum 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 hemihydrate can be controlled within specific parts hy 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 hemihydrate content is very much below 17.. 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 Lo 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 anhydrite which was previously used.
To this end, the invention proposes the use of a mixture of calcium sulphite hemi-hydrate and calcium sulphate dihydraLe in a composition of 17. to 997. calcium sulphite hemi-hydrate, preferably 17. to 307. calcium sulphite hemi-hydrate, and 17. Lo 997. calcium
- 3 sulphate dihydrate, preferably 607. to 997. 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 environment-polluting 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 (3)
1. Use of a mixture of calcium sulphite hemi-hydrate 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 17« tc 997. of calcium sulphite hemi-hydrate, preferably 17. to 307. calcium sulphite hemi-hydrate and 17. to 997. calcium sulphate dihydrate, preferably 607. 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 aLmospheric oxygen, to form calcium sulphate dihydrale, some of lhe 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 hemi-hydrate and calcium sulphate dihydrate as a setting regulator in the manufacture of cement, the mixture having a composition of 17. to 997. calcium sulphite hemihydrate, preferably 17. to 307. calcium sulphite hemi-hydrate, and 17. to 997. calcium sulphate dihydrate, preferably 607. to 997. calcium sulphate dihydrate.
3. Cement manufactured by use of a mixture according to either of the preceding claims.
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 |
|---|---|
| IE812280L IE812280L (en) | 1982-04-01 |
| IE51795B1 true IE51795B1 (en) | 1987-04-01 |
Family
ID=6113333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE2280/81A IE51795B1 (en) | 1980-10-01 | 1981-10-01 | Use of a mixture of calcium sulphite hemi-hydrite and calcium sulphate dihydrate for the manufacture of cement |
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 |
| WO1991007360A1 (en) * | 1989-11-20 | 1991-05-30 | Chemie Ag Bitterfeld-Wolfen | Process for the production of cement clinker and sulphur dioxide recovery |
| 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 GB GB8129302A patent/GB2084562B/en not_active Expired
- 1981-09-29 DK DK431681A patent/DK431681A/en not_active Application Discontinuation
- 1981-09-30 GR GR66169A patent/GR75013B/el unknown
- 1981-09-30 FR FR8118455A patent/FR2491054A1/en not_active Withdrawn
- 1981-09-30 BE BE0/206114A patent/BE890558A/en not_active IP Right Cessation
- 1981-09-30 LU LU83658A patent/LU83658A1/en unknown
- 1981-10-01 IE IE2280/81A patent/IE51795B1/en unknown
- 1981-10-01 JP JP56154891A patent/JPS5788053A/en active Pending
- 1981-10-01 IT IT24262/81A patent/IT1138682B/en active
- 1981-10-01 DD DD81233790A patent/DD201667A5/en unknown
- 1981-10-01 NL NL8104481A patent/NL8104481A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| IT8124262A0 (en) | 1981-10-01 |
| GB2084562B (en) | 1984-03-07 |
| FR2491054A1 (en) | 1982-04-02 |
| IE812280L (en) | 1982-04-01 |
| GB2084562A (en) | 1982-04-15 |
| DE3037056A1 (en) | 1982-04-22 |
| DD201667A5 (en) | 1983-08-03 |
| GR75013B (en) | 1984-07-12 |
| BE890558A (en) | 1982-01-18 |
| IT1138682B (en) | 1986-09-17 |
| LU83658A1 (en) | 1982-02-17 |
| DK431681A (en) | 1982-04-02 |
| JPS5788053A (en) | 1982-06-01 |
| NL8104481A (en) | 1982-05-03 |
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