Frishauf, Holtz, Goodman & Woodward
Ceramic tile produced from sludge slag
 The ceramic tile using sludge slag of the present invention comprises: ______________________________________ sludge slag from 5 to 70 wt. %, agalmatolite from 20 to 90 wt. %, clay from 5 to 50 wt. %, and the balance being incidental impurities. ______________________________________ The sludge slag is obtained by separating sludge from sewage, burning the thus separated sludge into ash, melting the resultant ash and solidifying the thus melted ash. The sludge slag consists essentially of: ______________________________________ silicon dioxide (SiO.sub.2) from 10 to 50 wt. %, aluminum oxide (Al.sub.2 O.sub.3) from 3 to 20 wt. %, phosphorous pentoxide (P.sub.2 O.sub.5) from 1 to 30 wt. %, calcium oxide (CaO) from 10 to 70 wt. %, magnesium oxide (MgO) from 0.5 to 20 wt. %, and iron oxide (Fe.sub.2 O.sub.3) from 5 to 25 wt. %. ______________________________________ 
Shinagawa Shirorenga K.K. NKK Corporation
Y C
Y02P C04B
additional inventional
Senji Masaru Yasushi Takashi Atsuo Takashi Katsuhiro
Kaneko Takikawa Hoshino Shindo Inokawa Otsuka Wakasugi