Korea Institute of Geoscience and Mineral Resources

Young-Nam Jang

Soo-Chun Chae

Kyungsun Song

Myung-Kyu Lee

Myung Gyu Lee

Jun-Hwan Bang

Kyoung Won Ryu

Hwanju Jo

Hye-In Won

Kyoung-Won Ryu

Disclosed is a method of preparing calcium carbonate using a direct carbonation reaction. The method includes dissolving fuel gas desulfurization gypsum into an ammonia solution, performing a filtering process after making a carbonation reaction by feeding carbon dioxide into the ammonia solution in which the fuel gas desulfurization gypsum is dissolved, and performing a filtering process after precipitating the calcium carbonate by maintaining a filtered solution in a stationary state.

Method of preparing calcium carbonate using direct carbonation reaction

Disclosed is a method of detoxifying asbestos of waste slate. The method includes concentrating the asbestos by introducing hydrochloric acid aqueous solution into waste slate powder to dissolve and remove a limestone component contained in the waste slate; and mixing the concentrated asbestos with oxalic acid and performing a low-temperature heat treatment. The waste slate is crushed and pulverized and powder of the crushed and pulverized waste slate is formed in a size in a range of 100 meshes to 300 meshes. The detoxified asbestos includes re-crystallized magnesium oxalate having a rhombohedral or amorphous shape.

Method of detoxifying asbestos contained in waste slate and detoxified asbestos obtained through the same

Disclosed is a method of detoxifying asbestos by using a room-temperature recrystallization scheme. The method includes heat-treating a rock or slate containing asbestos; and putting the heat-treated rock or slate in an aqueous solution, to which organic acid is added, to allow the heat-treated rock or slate to react with the aqueous solution having the organic acid.

Method of detoxifying asbestos by using room-temperature recrystallization scheme

Disclosed is a method of removing asbestos from an asbestos-containing material by 99% through low temperature heat treatment. The method includes mixing an asbestos-containing material with an oxalic acid at a weight ratio in a range of 1:0.002 to 1:1 and performing heat treatment with respect to a mixture at a temperature of 90&#xb0; C. to 110&#xb0; C. to remove asbestos from the asbestos-containing material by 99% or more.

Growing community of inventors

Daejeon, South Korea

Young-Nam Jang