초록 ▼

A lime material and a siliceous material containing 10 to 40% by weight of alumina are admixed with an alkali solution, and the mixture is subjected to hydrothermal reaction with saturated water vapor at 4 to 40 kg/cm2 to form tobermorite. The reaction mixture is filtered to separate the tobermorite

A lime material and a siliceous material containing 10 to 40% by weight of alumina are admixed with an alkali solution, and the mixture is subjected to hydrothermal reaction with saturated water vapor at 4 to 40 kg/cm2 to form tobermorite. The reaction mixture is filtered to separate the tobermorite therefrom. A lime material and a gypsum material are added to the resulting filtrate, and the mixture is reacted at room temperature to a temperature of 90°C. to form ettringite. The alkali filtrate separated from the ettringite is reused for the production of tobermorite.

대표청구항 ▼

A process for producing ettringite by adding an alkali solution to siliceous material and gypsum material and reacting the mixture at room temperature or hydrothermally, characterized by the steps of: admixing an alumina-containing siliceous material and a lime material with an alkali solution, subj

A process for producing ettringite by adding an alkali solution to siliceous material and gypsum material and reacting the mixture at room temperature or hydrothermally, characterized by the steps of: admixing an alumina-containing siliceous material and a lime material with an alkali solution, subjecting the resulting mixture to hydrothermal reaction with water vapor at a pressure of 4 to 40 kg/cm2 to form tobermorite, filtering off the tobermorite from the reaction mixture, and admixing a lime material and a gypsum material with the resulting alkali reaction product in the filtrate and reacting the mixture at room temperature to a temperature of up to 90°C. to form ettringite. A process for producing ettringite by adding an alkali solution to siliceous material and gypsum material and reacting the mixture at room temperature or hydrothermally, characterized by the steps of: admixing an alumina-containing siliceous material and a lime material with an alkali solution, subjecting the resulting mixture to hydrothermal reaction with water vapor at a pressure of 4 to 40 kg/cm2 to form tobermorite, and admixing a lime material and a gypsum material with the resulting alkali reaction product in the reaction mixture containing the tobermorite and reacting the mixture at room temperature to a temperature of up to 90°C. to form ettringite.