Two-part gunning refractory composition
AssigneeShinagawa Refractories Co., Ltd.
InventorsHiroshi Kyoden, Kenji Ichikawa, Yoshihisa Hamazaki
Life of this patent
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Abstract
The present invention relates to a two-part gunning refractory composition wherein fine powders of a refractory aggregate and superfine refractory powders are previously made into the form of a slurry containing therein a deflocculant, thereby reducing the amount of aluminous cement and also reducing the amount of water to achieve a deposit applied by gunning having a quality comparable to one produced by casting.
Claims12
A two-part gunning refractory composition suitable for lining molten pig iron receiving troughs and vessels comprising, aa a whole, a refractory raw material composed of 84-98 % by weight of refractory aggregate consisting of a coarse/fine grain portion and a fine powder portion, 12-2% by weight of a superfine refractory powder having a particle size of at most 10 .mu.m, a deflocculant, one or more of water and colloidal silica, and 4-0% by weight of aluminous cement, the improvement comprising the composition comprising a coarse/fine grain part (Part A) composed of said coarse/fine grain portion of said refractory aggregate which contains 0.05 to 0.5% by weight of a hardening accelerator, per 100 weight % of said refractory raw material, and a slurry part (Part B) separate from said Part A, said Part B comprising the remaining fine powder of the refractory aggregate, the superfine powder, 0.01-0.5% by weight of a deflocculant per 100 weight % of said refractory raw material and 4-10% by weight of one or more of water and colloidal silica capable of being dispersed in water per 100 weight % of said refractory raw material said aluminuous cement being incorporated into at least one of Part A and Part B.
A method for lining troughs or vessels for molten pig iron by gunning with a two-part gunning refractory composition comprising, as a whole, a refractory raw material composed of 84-98% by weight of refractory aggregate consisting of a coarse/fine grain portion and a fine powder portion, 12-2% by weight of superfine refractory powder having a particle size of at most 10 .mu.m, a deflocculant, one or more of water and colloidal silica, and 4-0% by weight of aluminous cement, the improvement comprising providing a composition comprising a coarse/fine grain part (Part A) composed of said coarse/fine grain portion of said refractory aggregate which contains 0.05 to 0.5% by weight of a hardening accelerator, per 100 weight % of said refractory raw material, and providing a slurry part (Part B) comprising the remaining fine powder of the refractory aggregate, the superfine powder, 0.01-0.05% by weight of a deflocculant per 100 weight % of said refractory raw material and 4-10% by weight of one or more of water and colloidal silica per 100 weight % of said refractory raw material said aluminous cement being incorporated into at least one of Part A and Part B, adding the Part A and Part B at a nozzle of a spraying gun to line the resultant mixture on the inner surface of the trough or vessel.
A two-part gunning refractory composition suitable for lining molten pig iron receiving troughs and vessels comprising:
- (i) coarse/fine grains containing 0.05 to 0.5% by weight of a hardening accelerator per 100 weight percent of the refractory composition;
- (ii) a slurry comprising a fine powder, 12-2% by weight of a superfine refractory powder having a particle size of at most 10 .mu.m, 0.01-5% by weight of a deflocculant and 4-10% by weight of one or more of water and colloidal silica capable of being dispersed in water, there further being 4-0% by weight of aluminous cement incorporated into at least one of (i) and (ii);
- and
- wherein the amount of the coarse/fine grains and the fine powder together is 84-98% and wherein components (i) and (ii) are separate.
Dependencies are inferred from the claim text.