초록 ▼

A porous silicate granular material, especially as aggregate for the production of construction materials such as lightweight concrete, mortar or heat-insulating plaster containing glass and a glassy crystalline component comprising 45 to 85 wt. % SiO 2 , 5 to 20 wt. % alkali oxide, 5 to 30 wt. % a

A porous silicate granular material, especially as aggregate for the production of construction materials such as lightweight concrete, mortar or heat-insulating plaster containing glass and a glassy crystalline component comprising 45 to 85 wt. % SiO 2 , 5 to 20 wt. % alkali oxide, 5 to 30 wt. % alkaline earth oxide and 2 to 30 wt. % of other oxides such as Al 2 O 3 and/or Fe 2 O 3 . The glassy crystalline component accounts for 5 to 75 wt. % of the granular material. The glassy crystalline component of the granular material is a sinter reaction product. There is also a method of producing such a granular material in which the mixture is agglomerated at a temperature of 20° C. to 150° C. at normal pressure with the water vapour partial pressure being adjusted, selected or controlled as a function of time-temperature and carbon dioxide being excluded or admitted, whereby the admission of carbon dioxide is controlled by adjusting or selecting the carbon dioxide partial pressure.

대표청구항 ▼

1. A porous silicate granular material, useful as aggregate for the production of construction materials including lightweight concrete, mortar or heat-insulating plaster and containing glass and a glassy-crystalline component comprising45 to 85 wt. % SiO 2 ,5 to 20 wt. % alkali oxide,5 to 30 wt. %

1. A porous silicate granular material, useful as aggregate for the production of construction materials including lightweight concrete, mortar or heat-insulating plaster and containing glass and a glassy-crystalline component comprising45 to 85 wt. % SiO 2 ,5 to 20 wt. % alkali oxide,5 to 30 wt. % alkaline earth oxide and2 to 30 wt. % of other oxides selected from the group consisting of alumina, iron oxide, and mixtures thereof, whereby the glassy crystalline component accounts for 5 to 75 wt. % of the granular material, wherein the glassy crystalline component is the sinter reaction product of a mixture ofquartz powder and/or another essentially pure fine-grained SiO 2 carrier,powdered clay and/or powdered clay mineral,Portland cement,sodium hydroxide in hydrous solution and an expanding agent as at least one additive. 2. A method for producing granular material, useful as aggregate for the production of construction materials including lightweight concrete, mortar or heat-insulting plaster and containing glass and a glassy-crystalline component comprising45 to 85 wt. % SiO 2 ,5 to 20 wt. % alkali oxide,5 to 30 wt. % alkaline earth oxide and2 to 30 wt. % of other oxides selected from the group consisting of alumina, iron oxide, and mixtures thereof, whereby the glassy crystalline component accounts for 5 to 75 wt. % of the granular material, whereina mixture of at leastpowdered glass,quartz powder and/or another essentially pure fine-grained SiO 2 carrier,powdered clay and/or powdered clay mineral,Portland cement,sodium hydroxide in hydrous solution;an expanding agent and as at least one additive and water is prepared,the mixture is agglomerated at a temperature of 20° C. to 150° C. at standard pressure of 101325 Pathe intermediate product is optionally crushed and gradedthe intermediate product thus obtained is heated at standard pressure of 101325 Pa to a temperature of 700° C. to 1250° C. and sintered and expanded at this temperature. 3. The method according to claim 2,wherein after agglomeration the mixture is put into intermediate storage and then dried and/or heat treated. 4. The method according to claim 3, wherein the mixing, agglomeration, intermediate storage, drying and/or heat treatment takes place with carbon dioxide being admitted. 5. The method according to claim 2, wherein powdered glass, quartz powder and/or another essentially pure fine-grained SiO 2 carrier having a grain size of <40 μm is used. 6. The method according to claim 2, wherein during preparation of the mixture silicate, oxide, hydroxide, carbonate and/or sulphate materials are added as additives. 7. The method according to claim 2, wherein during preparation of the mixture water glass solutions, filter dust, ground slag, powdered ceramic, quicklime, hydrated lime, powdered limestone, gypsum, anhydride, powdered corundum, aluminium hydrate and/or oxides, hydroxides, carbonates and sulphates of alkalis and alkaline earths are added. 8. The method according to claim 2, wherein a mass fraction of the granular material originating from additives and/or accessory agents as end product is a maximum of 20 wt. %. 9. The method according to claim 2, wherein carbon and/or carbon carriers including soot, powdered graphite, powdered coal, fine-grained silicon carbide and carbohydrate are used as swelling agents. 10. The method according to claim 2, wherein the mixture is adjusted as a doughy pasty mass and then agglomerated. 11. The method according to claim 2, wherein the mixture, especially in the form of a doughy pasty mass is subjected to heat treatment. 12. The method according to claim 11, wherein the heat treatment is provided by Joule heat via an ac power supply. 13. The method according to claim 11, wherein the heat treatment takes place by supplying microwaves. 14. The method according to claim 2, wherein the agglomeration is accomplished by a granulation process or takes place by pressing. 15. The method acco rding to claim 2, wherein the sintering and expanding takes place in a rotary kiln with the addition of a parting compound.