| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate a large quantity of a waste water generated at the time of treating a waste paper by mixing the waste paper defibrated with the addition of an inorganic preventing agent for hardening inhibition having organic adsorptivity, a cement and an aggregate to suppress the inhibition of cement hardening and the foaming of a slurry caused by using the waste paper. SOLUTION: The pulp slurry is obtained by adding 1-8 wt.% inorganic preventing agent for hardening inhibition having organic adsorptivity such as gypsum, sepiolite, micron silica, calcium sulfate into the waste paper, allowing to be left standing in the presence of water for 1-48 hr, preferably 12-36 hr and defibrating. A water based slurry is obtained by mixing the pulp slurry, the cement such as Portland cement and blast furnace cement, a mineral, an inorganic or organic aggregate, a hardening accelerator such as a sodium salt, a calcium salt, a magnesium salt and an aluminum salt. A green sheet obtained by making sheet using the water based slurry is press-molded, aged and hardened.</p> |
