A dry backfill for producing a basic molded heavy-clay refractory product, to such a product and a method for producing the same, to a lining of an industrial furnace, and to an industrial furnace.

A dry backfill for producing a basic molded heavy-clay refractory product, to such a product and a method for producing the same, to a lining of an industrial furnace, and to an industrial furnace.

The invention concerns a batch for the production of a refractory magnesia-carbon product or a refractory alumina-magnesia-carbon product, a process for the production of a refractory magnesia-carbon product or a refractory alumina-magnesia-carbon product, a refractory magnesia-carbon product or a refractory alumina-magnesia-carbon product as well as the use of a magnesia-carbon product or a refractory alumina-magnesia-carbon product.

The invention concerns a batch for the production of a refractory magnesia-carbon product or a refractory alumina-magnesia-carbon product, a process for the production of a refractory magnesia-carbon product or a refractory alumina-magnesia-carbon product, a refractory magnesia-carbon product or a refractory alumina-magnesia-carbon product as well as the use of a magnesia-carbon product or a refractory alumina-magnesia-carbon product.

A manufacturing method of a low heat-conducting magnesium-aluminium spinel brick includes: (1) evenly mixing sintered magnesia, fused magnesia, magnesium-aluminium spinel and corundum to prepare flame retardant coating raw material mixed powder, adding naphthalene binder to the flame retardant coating raw material mixed powder to prepare the flame retardant coating raw materials after evenly mixing; (2) evenly mixing forsterite, fayalite and magnesia, adding the naphthalene binder to the mixed powder, moulding, drying, and then burning to obtain aggregate composite hortonolite raw materials; adding the naphthalene binder to the aggregate composite hortonolite having granularity ≤5 mm to prepare the thermal insulating layer raw materials after evenly mixing; (3) spacing and loading the flame retardant coating raw materials and the thermal insulating layer raw materials in a mold, pressing into green bricks, keeping the green bricks at a temperature of 110° C. for 24 hours, drying, and burning into magnesium-aluminium spinel bricks.

A manufacturing method of a low heat-conducting magnesium-aluminium spinel brick includes: (1) evenly mixing sintered magnesia, fused magnesia, magnesium-aluminium spinel and corundum to prepare flame retardant coating raw material mixed powder, adding naphthalene binder to the flame retardant coating raw material mixed powder to prepare the flame retardant coating raw materials after evenly mixing; (2) evenly mixing forsterite, fayalite and magnesia, adding the naphthalene binder to the mixed powder, moulding, drying, and then burning to obtain aggregate composite hortonolite raw materials; adding the naphthalene binder to the aggregate composite hortonolite having granularity ≤5 mm to prepare the thermal insulating layer raw materials after evenly mixing; (3) spacing and loading the flame retardant coating raw materials and the thermal insulating layer raw materials in a mold, pressing into green bricks, keeping the green bricks at a temperature of 110° C. for 24 hours, drying, and burning into magnesium-aluminium spinel bricks.

A manufacturing method of a low heat-conducting magnesium-aluminium spinel brick includes: (1) evenly mixing sintered magnesia, fused magnesia, magnesium-aluminium spinel and corundum to prepare flame retardant coating raw material mixed powder, adding naphthalene binder to the flame retardant coating raw material mixed powder to prepare the flame retardant coating raw materials after evenly mixing; (2) evenly mixing forsterite, fayalite and magnesia, adding the naphthalene binder to the mixed powder, moulding, drying, and then burning to obtain aggregate composite hortonolite raw materials; adding the naphthalene binder to the aggregate composite hortonolite having granularity 5 mm to prepare the thermal insulating layer raw materials after evenly mixing; (3) spacing and loading the flame retardant coating raw materials and the thermal insulating layer raw materials in a mold, pressing into green bricks, keeping the green bricks at a temperature of 110 C. for 24 hours, drying, and burning into magnesium-aluminium spinel bricks.

To provide a high-zirconia electrocast refractory in which occurrence of cracks in manufacture and occurrence of cracks in use as a furnace material is further reduced while maintaining extremely high corrosion resistance to molten glass. The high-zirconia electrocast refractory contains 96.7 to 98.5 mass % of ZrO.sub.2, 0.8 to 2.7 mass % of SiO.sub.2, 0 to 0.2 mass % of Na.sub.2O, 0.21 to 1 mass % of K.sub.2O, 0.1 to 0.4 mass % of Al.sub.2O.sub.3, and does not substantially contain B.sub.2O.sub.3, in terms of oxide, as a chemical composition, wherein contents of the Na.sub.2O and the K.sub.2O satisfy a relation of following Formula (1)
0.15 mass %C.sub.K2O/2+C.sub.Na2O0.6 mass %(1)
where C.sub.K2O is the content of K.sub.2O and C.sub.Na2O is the content of Na.sub.2O, and each of the contents is expressed by mass % in the refractory.

To provide a high-zirconia electrocast refractory in which occurrence of cracks in manufacture and occurrence of cracks in use as a furnace material is further reduced while maintaining extremely high corrosion resistance to molten glass. The high-zirconia electrocast refractory contains 96.7 to 98.5 mass % of ZrO.sub.2, 0.8 to 2.7 mass % of SiO.sub.2, 0 to 0.2 mass % of Na.sub.2O, 0.21 to 1 mass % of K.sub.2O, 0.1 to 0.4 mass % of Al.sub.2O.sub.3, and does not substantially contain B.sub.2O.sub.3, in terms of oxide, as a chemical composition, wherein contents of the Na.sub.2O and the K.sub.2O satisfy a relation of following Formula (1)
0.15 mass %C.sub.K2O/2+C.sub.Na2O0.6 mass %(1)
where C.sub.K2O is the content of K.sub.2O and C.sub.Na2O is the content of Na.sub.2O, and each of the contents is expressed by mass % in the refractory.

The invention concerns a fused raw material for the production of a refractory product, a method for the production of the fused raw material and a use of the fused raw material.