PROCESS FOR THE PREPARATION OF LIGHT WEIGHT AGGREGATE MATERIAL

摘要

A sludge from alum of water purifying plant containing 40- 55 wt.% of silicone oxide of the total amount and having an Al2O3/SiO2 ratio less than 1.0 was sintered at a high temperature in the presence of a flux containing a mixture of 32 % of waste glass and 2 % of borax, or a mixture of 15 % of amphibole and 8 % of vorax with 2 % of carbon silicate as a foam generating agent to give the light weight aggregate material.