Preparation of refractory materials from asbestos tailings

Details Preparation of refractory materials from asbestos tailings Preparation of refractory materials from asbestos tailings

C - Chemistry, Metallurgy

04

B

C04B 35/20 (2006.01) B22C 1/00 (2006.01) B22D 41/46 (2006.01)

Patent

CA 2130330

A process for producing especially high temperature refractory materials from asbestos tailings, or from calcined products produced from asbestos tailings. The process comprises grinding the asbestos tailings, or the calcined product, to a suitable particle \ size; mixing the ground particles with magnesium oxide or a magnesium oxide precursor, and heating the mixture to a temperature of at least 1200 °C for a suitable length of time to form a large proportion of forsterite in the resulting product. The amount of magnesium oxide or precursor should preferably be such that the MgO:SiO2 ratio in the starting materials is at least 1.2, which usually requires an amount in the range of 10 to 25 % by weight, based on the weight of the asbestos tailings. More-over, the particle size of the asbestos tailings or calcined product should preferably be in the range of -1.7 mm ~ 0.1 mm. The resulting refractory product has a fusion point above about 1660 °C and can be used in contact with molten steel or the like, particularly when mixed with a bridging agent such as graphite.

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