Calcium oxide

About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.

Method of treating waste gases containing halogen compounds

Abstract: Halogen-containing waste gases resulting from the dry etching step of the process of fabricating semiconductor devices are rendered harmless by removing the halogen compounds concomitant with said waste gases. Waste gases containing halogen compounds are treated by bringing them into contact first with activated carbon and then into contact with a member selected from the group consisting of an alkali agent and a ferric oxide, at a linear velocity of about 3-50 cm/min at ambient temperature, volume ratios of said activated carbon to the alkali agent or the ferric oxide in terms of a substantially dried base being about 2-4, and said alkali agent being selected from a group consisting of calcium hydroxide, calcium oxide, magnesium hydroxide and magnesium oxide.

Method of chemically loading fibers in a fiber suspension

Abstract: A method of continuously loading fibers in a fiber suspension with calcium carbonate The fibers include a fiber wall surrounding a lumen A reactant solid in the form of calcium oxide and/or calcium hydroxide is mixed into the fiber suspension with a resultant initial process pH of between 11 and 12 The fiber suspension is transported at a consistency of between approximately 15 and 30% into an inner chamber of a closed reactor A reactant gas is injected into the reactor, whereby the reactor is pressurized to a pressure between 5 and 150 psi A temperature of the fiber suspension within the reactor is controlled at a range between −10° C and 80° C The fibers within the fiber suspension are loaded with calcium carbonate as a result of a chemical reaction between the reactant solid and the reactant gas in the reactor over a predetermined reaction time A specific type of calcium carbonate crystals are grown on the fiber walls of the fibers, depending upon the initial process pH, temperature, pressure and reaction time

Dental aluminate cement compositions

Abstract: A dental cement composition consisting of a composition A and a composition B, said composition A comprising (a) 100 parts by weight of a powder containing 20 to 70% by weight of calcium oxide and 30 to less than 80% by weight of aluminum oxide, said powder being coated on the surface with a water-soluble high-molecular substance, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, and said composition B comprising an aqueous solution containing 001 to 70% by weight of a water-soluble high-molecular substance

Method for the stabilization and detoxification of waste material

Abstract: A process for the treatment of waste material. The process includes the steps of combining the waste material with a treatment composition to form crystal growth structures and adsorb the waste material within the crystal growth structures thereby stabilizing the waste-material. The treatment composition includes natural zeolite seed, crystalline quartz, aluminum trihydrate, sodium carbonate or sodium hydroxide, dolomitic calcium oxide or calcium oxide or dolomitic limestone, and potassium hydroxide or potassium carbonate. The zeolite seed may be selected from the group consisting of clinoptilolite, chabazite, heulandite, phillipsite or mordenite and mixtures thereof.