Lance pipe for refining and method of making the same
AssigneeAikoh Co., Ltd.
InventorYoshihiro Hayashi
Life of this patent
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Abstract
A lance pipe covered with refractories having a thickness in the range 2-15 mm and a refractoriness higher than 1800.degree. K., comprising winding the outer periphery of a pipe with a refractory fibrous thread, lace, tape or cloth having a diameter of thickness in the range 0.5-15 mm at room temperature and under normal pressure; said thread, lace, tape or cloth being impregnated and adhered with a mixture which consists of 40-90% by weight of a refractory aggregate in which most of the particle size are -10 mesh but which contains the particle size of more than 15% by weight of each of -200 mesh and 28-200 mesh, and a refractory binder as the rest which consists of one or more of silica sol including 5-40% by weight of solid parts, hydrolyzed ethyl silicate and fire clay suspension.
Claims9
A method of producing a heat-resistant lance pipe which comprises:
- (a) providing a hollow refractory tube, and
- (b) applying to at least part of the outer surface thereof a first layer of an impregnated fibrous refractory material, with said fiber being based on alumina or silica and having a diameter ranging from 0.5 to 15.0 mm, said fibers being impregnated with a mixture consisting of 40-90% by weight of a refractory aggregate having a particle size of less than -10 mesh which contains in excess of 15% by weight of particles having a particle size of -200 mesh and in excess of 15% by weight of particles having a particle size of 28-200 mesh, and from 10-50% by weight of a refractory binder which includes at least one material from the group consisting of silica sol including 5-40% by weight of solid parts, hydrolyzed ethyl silicate and fire clay suspension.
A lance pipe which comprises a hollow refractory tube having on the outer surface thereof a fibrous refractory material consisting of alumina or silica base fibers and having a diameter ranging from 0.5 to 15.0 mm, said fibers being impregnated with a refractory material consisting of 40-90% by weight of a refractory aggregate having a particle size of less than -10 mesh which contains in excess of 15% by weight of particles having a particle size of 28-200 mesh and 15% by weight of particles having a particle size of -200 mesh, and from 10-50% by weight of a refractory binder which includes at least one material selected from the group consisting of silica sol including 5-40% by weight of solid parts, hydrolyzed ethyl silicate and fire clay suspension.
Dependencies are inferred from the claim text.