Novel harzburgite and preparation thereof
AssigneeUniversite de Sherbrooke
InventorPierre C. Aitcin
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Abstract
There is provided a novel harzburgite of the formula Py.sub.x Ol.sub.(1-x) where x is a decimal number of from 0.001 to 0.4, Py is an abbreviation for pyroxene, and Ol is an abbreviation for olivine having a total iron oxide content of less than 5% which is obtained by calcining a demagnetized fraction from a magnetite-containing serpentinite. The novel harzburgite is useful for preparing refractories.
Claims8
Process for preparing harzburgite having Fe.sub.2 O.sub.3 content of less than 5% and having a ratio MgO/SiO.sub.2 of from between 1.0 to 1.3 which comprises:
- (a) demagnetizing a magnetite-containing serpentinite by a dry process;
- (b) recovering the demagnetized serpentinite fraction;
- (c) calcining said demagnetized fraction thereby to transform the demagnetized serpentinite to an harzburgite having a Fe.sub.2 O.sub.3 content of less than 5% and a ratio MgO/SiO.sub.2 of from between 1.0 to 1.3.
A process which comprises calcining a demagnetized magnetite containing serpentinite to obtain a product containing less than 5% of Fe.sub.2 O.sub.3 and having a chemical composition more similar to forsterite than natural olivine and substantially devoid of fayalite.
Dependencies are inferred from the claim text.