| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for efficiently using a shell, capable of treating a large amount of shell wastes which cannot be treated conventionally in the large amount without depending on waste disposal by land reclamation or incineration disposal, and allowing conversion to a substance efficiently used after treated. <P>SOLUTION: A powder mixture of shell powder and a coal ash is obtained by pulverizing the shell to be mixed with the coal ash, and/or by pulverizing the shell and the coal ash after mixed, and is fired at a temperature of 1,000-1,400°C, to be brought into a fired product containing anorthite (CaO-Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>-2SiO<SB POS="POST">2</SB>). A ratio of the anorthite in the fired product gets higher therein when a chemical composition of the powder mixture contains 34-63 mass% of SiO<SB POS="POST">2</SB>, 22-42 mass% of Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>, and 12-28 mass% of CaO, (in particular, contains 40-55 mass% of SiO<SB POS="POST">2</SB>, 27-37 mass% of Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>, and 15-23 mass% of CaO). The fired product containing the anorthite is efficiently used as an admixture for cement and fine aggregate therefor. <P>COPYRIGHT: (C)2013,JPO&INPIT |
