公开(公告)号：JPH06157024A

公开(公告)日：1994-06-03

申请号：JP13724591

申请日：1991-05-13

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SHIBAZAKI YASUO ,  WATAMURA SHINJI ,  ITO HIROSHI ,  TONE YUKIHITO ,  KUMAGAI NOBUFUMI

IPC: C01B33/26 ,  C04B35/00 ,  C04B35/18 ,  C04B35/628

Abstract: PURPOSE:To produce the subject mineral moldable without requiring addition of an organic additive by applying a hydrothermal treatment to a powdery two-component system mineral of silica-alumina in an acidic or neutral solution and forming a thin kaolinite film. CONSTITUTION:A powdery two-component system mineral of silica-alumina such as mullite and an acidic or neutral solution is tightly sealed in a pressure tank such as an autoclave. A hydrothermal reaction is carried out by heating to convert the surface of the powdery mineral into a clay-like material exhibiting plasticity. The particle size of the powdery mineral is not especially restricted and about 3 to 10mum is preferable. As the condition of the hydrothermal reaction, the reaction temperature is preferably 200 to 250 deg.C in the case of 7 day reaction period and the most favorable result can be obtained especially at about 230 deg.C. Further, an acidic solution is preferably used as the solution and a 0.1 N to 0.01 N hydrochloric acid solution is especially preferable. As the result of this hydrothermal treatment, a thin kaolinite film can be formed on the surface of a mineral such as mullite.