Refractory lining repair material
A formulation containing polymer, resin and cement combined with aggregate can be used as a gunnable mix that is applied to a surface by being conveyed pneumatically in dry form to a nozzle, where water is added. Polymer in the gunnable mix enables it to adhere and bond to a surface, such as carbon brick, of a lining of a vessel used for the containment of molten metals. The formulation may be used, for example, to repair and protect blast furnace hearth linings.
1. A dry refractory composition, comprising:
5 wt % to 97 wt % of an aggregate comprising a material selected from the group consisting of calcined flint clay, calcined kaolin, calcined bauxitic kaolin, andalusite, tabular alumina, silicon carbide, silicon nitride, calcined alumina, reactive alumina, hydrated alumina, silica fume, white fused alumina, brown fused alumina, calcined bauxite, silica sand, silica, clay, kyanite, spinel, fused silica, zircon, zirconia, and combinations of each thereof;
0.01 wt % to 32 wt % of a water-soluble polymer selected from the group consisting of cellulose, dextran, poly(N-vinylpyridine), poly(acrylamide/acrylic acid), poly(acrylic acid), poly(ethylene glycol), poly(ethylene oxide), poly(N-vinylpyrrolidone), poly(vinyl alcohol), polyacrylamide, polyethyleneimine and combinations of each thereof;
0.01 wt % to 32 wt % of a resin selected from the group consisting of phenolic novolac resin, phenolic resole resin, epoxy resin, polyester resin, polyurethane resin, acrylic resin and combinations of each thereof; and
0.01 wt % to 15 wt % of a cement comprising a material selected from the group consisting of silicon dioxide, aluminum oxide, iron (III) oxide, calcium oxide and combinations of each thereof.
2. The refractory composition of claim 1 , wherein the aggregate comprises a material selected from the group consisting of calcined bauxitic kaolin, andalusite, tabular alumina, silicon carbide, silicon nitride, calcined alumina, reactive alumina, hydrated alumina, silica fume, white fused alumina, brown fused alumina, calcined bauxite, and combinations thereof.
3. The refractory composition of claim 1 , wherein the water-soluble polymer comprises poly(N-vinylpyrrolidone).
4. The refractory composition of claim 1 , wherein the cement comprises calcium aluminate cement.
5. The refractory composition of claim 1 , wherein the cement comprises a material selected from the group consisting of Portland cement, blast furnace cement, flue ash Portland cement, ciment composé, puzzolane cement, high alumina cement, Brunauer cement, Grenoble cement, Roman cement, and combinations thereof.
6. The refractory composition of claim 1 , wherein the aggregate is present in an amount from and including 40 wt % to and including 90 wt % of the dry refractory composition.
7. The refractory composition of claim 1 , wherein the cement is present in an amount from and including 0.01 wt % to and including 15 wt % of the dry refractory composition.
8. The refractory composition of claim 1 , further comprising a dispersant.
9. The refractory composition of claim 8 , wherein the dispersant is selected from the group consisting of sodium phosphates, naphthalene sulfonate salts, and sodium lignosulfates.
10. The refractory composition of claim 1 , further comprising a dry powder accelerator.
11. The refractory composition of claim 10 , wherein the dry powder accelerator is a material selected from the group consisting of hydrated lime, magnesium hydroxide, and lithium-containing compounds.
12. The refractory composition of claim 1 , further comprising polymer fibers.
13. The refractory composition of claim 12 , wherein the polymer fibers are comprised of a material selected from the group consisting of polyolefin, polyethylene, polypropylene, a combination of polyethylene and polypropylene, and combinations of these materials.
14. The refractory composition of claim 1 , wherein the resin is selected from the group consisting of phenolic novolac resin, phenolic resole resin, epoxy resin, acrylic resin and combinations thereof.
15. The refractory composition of claim 14 , wherein the resin comprises phenolic novolac resin.
16. The refractory composition of claim 15 , further comprising hydrated lime and sodium phosphate.
17. The refractory composition of claim 16 , further comprising a component selected from the group consisting of aluminum, silicon, ferrosilicon, ferrosilicon nitride, titanium dioxide, and combinations of each thereof.