CS272983B1 - White portland cement - Google Patents
White portland cement Download PDFInfo
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- CS272983B1 CS272983B1 CS110388A CS110388A CS272983B1 CS 272983 B1 CS272983 B1 CS 272983B1 CS 110388 A CS110388 A CS 110388A CS 110388 A CS110388 A CS 110388A CS 272983 B1 CS272983 B1 CS 272983B1
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- CS
- Czechoslovakia
- Prior art keywords
- cement
- weight
- portland cement
- gypsum
- white portland
- Prior art date
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- 239000011398 Portland cement Substances 0.000 title claims abstract description 19
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 26
- 239000010440 gypsum Substances 0.000 claims abstract description 26
- 239000002699 waste material Substances 0.000 claims abstract description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims abstract description 7
- 239000004568 cement Substances 0.000 claims description 18
- 238000007711 solidification Methods 0.000 claims description 11
- 230000008023 solidification Effects 0.000 claims description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 claims description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000012491 analyte Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
(54)(54)
Biely portlandský cementWhite Portland cement
Riešenie sa týká bieLeho portlandského cementu s regulátorom tuhnutia. Pre požadované parametre bieleho portlandského cementu ako regulátor tuhnutia sa používá odpadný priemyslový sádrovec z výroby kyseliny citrónovej a hydroxid vápenatý a odprašky z bielej linky alebo ich kombinácia.The solution relates to white Portland cement with a solidification regulator. Waste industrial gypsum from the production of citric acid and calcium hydroxide and white line dust or a combination thereof are used for the required parameters of the white Portland cement as solidification regulator.
CS 272983 BlCS 272983 Bl
CS 272 983 BlCS 272 983 Bl
Vynález sa týká bieleho portlandského cementu s regulátorom doby tuhnutia, Vynález v podstatě rieši reguláciu doby tuhnutia bieleho portlandského cementu.SUMMARY OF THE INVENTION The present invention relates essentially to controlling the setting time of white Portland cement.
Biely portlandský slinek má oproti běžnému portlandskému slinku rozdielne mineralogické zloženie. až v surovině je znížený obsah farbiacich oxidov, najma Fe2O3, č<?cv slinku představuje jeho obsah najviac 0,3 % hmotnostných.White Portland clinker has a different mineralogical composition compared to regular Portland clinker. only in the raw material is the content of coloring oxides reduced, especially Fe 2 O 3 , č <? c in the clinker, its content is not more than 0,3% by weight.
Z mineralogického hladiska biely slinok má znížený obsah tetrakalcium aluminátferritu C^AF do 1 % hmotnostného, Obsah trikalcium aluminátu C^A je oproti portlandskému slinku zvýšený prevažne nad 13 % hmotnostných. Zároveň má zvýšený obsah trikalcium silikátu CgS prevažne nad 60 % hmotnostných.From the mineralogical point of view, white clinker has a reduced content of tetrakalcium aluminateferrite C ^ AF up to 1% by weight. At the same time it has an increased content of tricalcium silicate CgS predominantly above 60% by weight.
Tuhnutie bieleho portlandského cementu prebieha obdobné ako u běžného portlandského cementu. Regulátor doby tuhnutia musí spínat požiadavku na bělost. Z literatúry je známa rada regulátorov tuhnutia p-cementu. Je to prevažne CaSO^ . 2H2O prírodný alebo odpadný sádrovec z chemických výrob znečistěný přísadami (AO 2035 26). Bodla AO 2035 26 sa ako regulátor tuhnutia používá odpadný sádrovec alebo anhydrit z priemyselných výrob, znečistěný najviac 35 % hmot. hydroxidu trojmooného železa s výhodou kryštalických alebo oxidu trojmooného železa, ktorý je sfarbený do červena a preto nie je vhodný ako regulátor tuhnutia bieleho portlandského cementu. Ďalej ako regulátor tuhnutia sú známe lignosulfonany alkalických kovov, kyselina fosforečná a jej soli, chlorid vápenatý CaCl2 a iné přísady regulujíce dobu tuhnutia cementu.The solidification of white Portland cement is similar to that of conventional Portland cement. The setting time controller must switch the whiteness requirement. A number of p-cement solidification regulators are known in the literature. It is predominantly CaSO4. 2H 2 O natural or waste gypsum from chemical products contaminated with additives (AO 2035 26). The solidification regulator AO 2035 26 uses waste gypsum or anhydrite from industrial production contaminated with not more than 35% by weight. trivalent iron hydroxide, preferably crystalline or trivalent iron oxide, which is colored red and is therefore not suitable as a solidification regulator for white Portland cement. In addition, alkali metal lignosulfonates, phosphoric acid and its salts, calcium chloride CaCl 2 and other cement setting time control agents are known as solidification regulators.
V podstatě posobí regulátor tuhnutia bieleho cementu tým, že ovplyvňuje hydraáciu hlinitanov a to bud znižuje rozpustnost hlinitanov v roztoku alebo vytvára polopriepustnú blánu okolo hydratizováného zrna. Zároveň nastáva vyzrážanie koloidnej zrazeniny hydrokremičitanov vápenatých z koloidného roztoku.Essentially, the solidification regulator of the white cement affects the hydration of aluminates and this either reduces the solubility of the aluminates in solution or forms a semipermeable membrane around the hydrated grain. At the same time, a precipitation of the colloidal precipitate of calcium silicates occurs from the colloidal solution.
V súčasnosti sa na reguláciu doby tuhnutia bieleho portlandského cementu používajú sádrové črepy. Sádrové črepy sú odpad, ktorý vzniká pri výrobě keramiky. Ich bělost bývá v rozmedzí 80 - 83° na Standard síran barnatý BaSO^. Po chemickej stránke sádrové črepy obsahují prevažne dihydrát síranu vápenatého CaSO^, Sú roznej kusovitosti a před spracovaním, t.j. přidáváním pri mletí cementu, sa upravují na požadovaní velkost z dovodu zabezpečenia správného dávkovania. Množstvo požadovaných sádrových črepov vhodných pre reguláciu doby tuhnutia bieleho portlandského cementu nie je dostatečné na pokrytie celej kapacity výroby bieleho portlandského cementu. Preto část regulátora tuhnutia (sádrových črepov) je zabezpečovaná dovozom. Množstvo sádrových črepov sa v budících rokoch ešte zníži.Currently, gypsum chips are used to control the setting time of white Portland cement. Gypsum chips are waste that is produced in the production of ceramics. Their whiteness is in the range of 80 - 83 ° to Standard barium sulfate BaSO 4. Chemically, the gypsum chips contain predominantly calcium sulfate dihydrate CaSO4. by adding in the grinding of the cement, they are adjusted to the required size to ensure proper dosing. The amount of gypsum chips required to control the setting time of the white Portland cement is not sufficient to cover the entire production capacity of the white Portland cement. Therefore, part of the solidification regulator (plaster shards) is provided by import. The amount of gypsum chips will decrease even further in the coming years.
Uvedený problém rieši vynález, ktorého predmetom je biely portlandský cement. Podstatou vynálezu je zloženie cementu, kde ako přísada pre reguláciu doby tuhnutia bieleho portlandského cementu sa použije 3 - 10 S hmot. odpadného sadrovca z priemyselnej výroby s obsahom do 1 % hmot. kyseliny citrónovej a do 10 % hmot. hydroxidu vápenatého, alebo oxidu vápenatého, alebo do 10 % hmot. cementárskych odpraškov z výroby linky bieleho cementu alebo ich kombináciu.The present invention solves the problem of white Portland cement. The present invention is based on a cement composition wherein 3-10% by weight of cement is used as an additive to control the setting time of white Portland cement. waste gypsum from industrial production with a content of up to 1% by weight % citric acid and up to 10 wt. % calcium hydroxide or calcium oxide, or up to 10 wt. cement dust from the production of a white cement line or a combination thereof.
Výhodou použitia odpadného sadrovca oproti sádrovým črepom je jeho vyššia bělost, ktorá je v rozmedzí 85 - 88° na Standard síranu hornatého BaSO4, čo kladné ovplyvňuje bělost bieleho pprtlandského cementu. Ďalšou výhodou použitia odpadného sadrovca z výroby kyseliny citrónovej ako regulátora tuhnutia bieleho portlandského cementu je likvidácia priemyselných odpadov, čo je z ekologického hladiska velmi výhodné. Taktiež jednou z výhod použitia je odstránenie dovozu sádrových črepov, t.j. úspora devíz. Přidáváním hydroxidu vápenatého Ca(PH)2 resp. odpraškov alebo ich kombinácia sa kladné prejaví na zvýšení pevností bieleho portlandského cementu.The advantage of using gypsum waste over gypsum chips is its higher whiteness, which is in the range of 85 - 88 ° to the standard of sulphate BaSO 4 , which positively affects the whiteness of white pprtland cement. Another advantage of using gypsum waste from the production of citric acid as the solidification regulator of white Portland cement is the disposal of industrial waste, which is very advantageous from an environmental point of view. Also, one of the advantages of use is the elimination of gypsum fragments, ie foreign exchange savings. Addition of calcium hydroxide Ca (PH) 2 resp. or a combination thereof will have a positive effect on increasing the strength of the white Portland cement.
Výhody uvedeného riešenia sú vyjádřené v nasledovných príkladoch.The advantages of said solution are expressed in the following examples.
CS 272 983 Bl fCS 272 983 B1 f
S,WITH,
K bielemu portlandskému slinku zo ZCV k.p. Rohožník zomletého na měrný povrch 400 m2 . . kg-'1' sme přidali sádrové črepy, odpadný sádrovec a odpadný sádrovec so zvýšeným obsahom hydroxidu vápenatého a odpraškov z linky výroby bieleho portlandského cementu a ich kombináciou:To the white Portland clinker from ZCV kp Rohožník ground to a surface of 400 m 2 . . kg - ' 1 ' we have added gypsum chips, waste gypsum and waste gypsum with an increased content of calcium hydroxide and dust from the white Portland cement production line and their combination:
Tabulkatable
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS110388A CS272983B1 (en) | 1988-02-22 | 1988-02-22 | White portland cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS110388A CS272983B1 (en) | 1988-02-22 | 1988-02-22 | White portland cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS110388A1 CS110388A1 (en) | 1990-07-12 |
| CS272983B1 true CS272983B1 (en) | 1991-02-12 |
Family
ID=5344532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS110388A CS272983B1 (en) | 1988-02-22 | 1988-02-22 | White portland cement |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS272983B1 (en) |
-
1988
- 1988-02-22 CS CS110388A patent/CS272983B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS110388A1 (en) | 1990-07-12 |
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