process for converting chemically and biologically active urban muells in building materials

摘要

A building material is produced rapidly from urban waste by (a) comminuting the waste to pieces of a size about 2.5 cm., (b) mixing with N-cpds. (ammonium sulphate, nitrogen treioxide, ammonium nitrate or sodium nitrate) to give a C:N ratio of 20-50 wt.% and water to give a water content of 40-70 wt.%, in a tank at 50-80 degrees C., pH of =6, storing for 3-7 days, periodically aerating, (c) drying, removing 60-90% of the water, (d) pulverising, (e) adding fillers/binders chosen from plaster of Paris, line, silica, Portland cement and additives of calcium chosen from gypsum, selenite, alabaster, silky gypsum or mixts. of these, (f) pressing to shape, and (g) hardening in a damp atmos.