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    • 8. 发明专利
    • HARDENED BODY CONTAINING PAPER-MAKING SLUDGE AND ITS PRODUCTION
    • JPH0397648A
    • 1991-04-23
    • JP23425389
    • 1989-09-08
    • FUJI FUNEN KENZAI KOGYO KKARAI YASUOAOKI SHIGEKI
    • ARAI YASUOAOKI SHIGEKI
    • C04B28/26C04B40/02
    • PURPOSE:To obtain the hardened body having properties such as strength sufficient in practical use and appropriately utilized as a building material, etc., by kneading specified amts. of the water glass and hardening agent with paper- making sludge and hardening the kneaded material. CONSTITUTION:From 50 to 200 pts.wt. or preferably 100-150 pts.wt. of water glass is mixed with 100 pts.wt. of the paper-making suldge contg. 30-100% water and kneaded, 5-50 pts.wt. or preferably 10-20 pts.wt. of the hardening agent is then added to the kneaded material and mixed, and the mixture is subjected to a reaction to form a paper-making sludge slurry. An acid such as sulfuric acid and a salt such as sodium silicofluoride are exemplified as the hardening agent. The slurry is poured into a specified framework, cured and hardened, the hardened material is removed from the framework to obtain an intermediate hardened body, and the body is dipped in a soln. of the hardening agent for a specified time and cured. Consequently, a hardened body contg. paper-making sludge low in the shrinkage factor and bulk density and extremely efficiently utilized as the lightweight building material is obtained.