Mineral foam granulate, useful e.g. in the construction of light weight concrete and for fire production, obtained by thermal foam process containing the starting mixture of rock flours, glass flours and foaming agents

摘要

Mineral foam granulates (I), obtained by a thermal foam process containing the starting mixture of rock flours, glass flours and foaming agents, is claimed, where (I) exhibits: temperature stability of greater than 1000[deg] C; particle pressure stability of 30-180 kilo newtons; fine porosity and alkali insensitivity. Independent claims are included for: (1) the preparation of (I) comprising mixing and granulating the starting mixture, preheating the granulates in a preheating furnace at 900[deg] C and drying, transferring the preheated granulates to a heating foam furnace, which is equipped with several combustion chamber and heating at nearer to the foaming temperature, subsequently blowing the mixture at 1050-1200[deg] C and cooling up to the molded stability, discharging, again cooling and classifying the obtained granulates; and (2) a device for the production (I) comprising a raw material treatment plant, a peltier device, a furnace device, a product discharge and a finished product warehouse, where the furnace device: is a multistage furnace device; contains the preheating furnace (1), foaming furnace (2) and cooler (3), which are directly fixed one after another; has several combustion chambers with separate controllable burners (11, 21); and exhibits a downward gradient after the last combustion chamber.