C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/2
C04B 35/18 (2006.01) C03C 11/00 (2006.01) C04B 14/24 (2006.01)
Patent
CA 1125315
ABSTRACT OF THE DISCLOSURE A lightweight, alkali metal borosilicoaluminate aggregate comprises discrete, porous and expanded particles, of approximately spherical shape, has a specific weight comprised between about 60 and about 600 kg/m3, a compression strength of from about 140kg/cm2 up to about 250 kg/cm2, is highly insoluble in water, steam, acids or bases, shows a melting temperature above 1500°C and a low alkalinity, and chemically comprises a homogenous admixture of acid, basic and amphoteric oxides, particularly containing from about 20 to 92% by weight of SiO2, from about 1 to 60% by weight of B2O3, from about 5 to 60% by weight of M2O wherein M is an alkali metal, from about 1 to 45% by weight of Al2O3 and from about 1 to 20% by weight of suitable additives to provide said aggregate with specific properties in accordance with the use thereof. The above oxides are chemically associated in various proportions to form a product in the nature of an alkali metal borosilicoaluminate in admixture with silicoborates, silicoaluminates and boroaluminates. A process for the obtention of the above lightweight aggregates comprises preparing a concentrated aqueous paste of an alkali metal hydroxide in admixture with suitable amounts of Al2O3 in any of its mineral forms, particularly kaolin; SiO2 in any of its mineral forms, particularly silica sand; - 1 - boric acid or borates; volatile materials; urea; and a heavy metal oxide such as iron, zinc, lead or titanium oxides in any of their mineral forms, whereby a reaction is initiated and the temperature is spontaneously raised; reacting the mass until there is no further increase in the temperature; drying the mass at a temperature of about 300°C; crushing the dried mass to form particles; heating said particles to a temperature of from about 600°C to 1000°C to expand and vitrify the product; and allowing, the expanded particles to cool down to room temperature.
312385
Johnson Douglas S. Q.c.
Walls-Muycelo Jose
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