Preparation of refractory materials from asbestos tailings

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

1992-02-21

1994-12-20

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501108, 501109, 501123, 501154, 501155, C04B 3504, C04B 3520

Patent

active

053745930

ABSTRACT:
A process for obtaining a synthetic refractory sand for use in steelmaking, said synthetic refractory sand being free-flowing, comprising at least 50% forsterite, having semi-angular and irregularly shaped grains, lenses and flat grains, a specific gravity of approximately 3 g/cm.sup.3, a void volume of less than approximately 50%, a coefficient of thermal expansion of approximately 1.09.times.10.sup.-5 and a fusion point of at least 1610.degree. C. including the steps of: (a) agglomerating a mixture comprising a particulate starting material selected from the group consisting of serpentine-containing asbestos tailings and an enstatite-containing product produced by calcining serpentine-containing asbestos tailings and from 10% to 25%, based on the total weight of mixture, of magnesium oxides or precursors of magnesium oxides with an aqueous binder solution to obtain agglomerates of said mixture; (b) calcining said agglomerates at a temperature of from 1200.degree. C. to 1500.degree. C. for from 1 to 2 hours; (c) recovering said synthetic refractory sand from the calcined agglomerates; and (d) crushing said synthetic refractory sand to a desired mesh size.

REFERENCES:
patent: 4476235 (1984-10-01), Chevalier-Bultel et al.
patent: 4497901 (1985-02-01), Ohtsuki et al.
patent: 5006490 (1991-04-01), Logan et al.
Aitcin, P.--C., "Refractory Applications of Basic Tailings From Quebec Asbestos Mines", American Ceramic Society Bull., vol. 61, No. 8, 1987, pp. 851-853 no month.
Chien, Y. T., et al., "Preparation and Performance of Packing Sands for Sliding Gate Systems for Steel Ladles", Ironmaking and Steelmaking, vol. 9, No. 6, 1982, pp. 252-257, no month.
Garlick, C.; et al., "The Effect of Sand Properties at High Temperature on Ladle Free Opening Performance", 1990 Steelmaking Conference Proceedings pp. 427-433 no month.
Cox, F. S. et al.; "Ladle Sands: Testing and Application", 1990 Electric Furnace Conference Proceedings, pp. 451-458, no month.
Benefiel, J. A.; et al., "Development of Operating Practices for Improved Free-Open Performance of Slide Gate Lades", Iron and Steelmaker No. 7, Jul. 1984, pp. 38-44.
Fujii, K.; et al., "100% Free Opening Without Oxygen Blowing For Sliding Gate System of Ladle", 70th Steelmaking Conf. Proc. vol. 70, 1987, no month pp. 63-68.
Habashi, F., "Advances in Asbestos Science", Paper presented at International Conference on Asbestos Products, Kuala Lumpur, Malaysia, Nov. 1991.

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