Grains for the production of a sintered refractory product, a batch for the production of a sintered refractory product, a process for the production of a sintered refractory product and a sintered refractory product

A batch for the production of a sintered refractory product, the batch comprising grains for the production of the sintered refractory product, the grains for the production of the sintered refractory product comprising the following features:

• 6.1 the grains for the production of the sintered refractory product are made of at least one of the following grains:
• 6.1.1 grains made of magnesia, the surface of which have a coating of zirconia at least in sections;
• or
• 6.1.2 grains made of magnesite, the surface of which have a coating of zirconia at least in sections;
• or
• 6.1.3 grains made of doloma, the surface of which have a coating of zirconia at least in sections;
• or
• 6.1.4 grains made of dolomite, the surface of which have a coating of zirconia at least in sections;
• 6.2 the grains for the production of the sintered refractory product, comprised by the batch, have a grain size of at least 2.8 mm;
• 6.3 wherein the proportion by weight of the coating of zirconia, in relation to the total weight of the grains for the production of the sintered refractory product comprised by the batch, is in the range from 1 to 50% by weight.

A process for the production of a sintered refractory product, the process comprising the following steps:

• 14.1 providing a batch, the batch comprising grains for the production of the sintered refractory product, the grains for the production of the sintered refractory product comprising the following features:
• 14.1.1 the grains for the production of the sintered refractory product are made of at least one of the following:
• 14.1.1.1 grains made of magnesia, the surface of which have a coating of zirconia at least in sections;
• or
• 14.1.1.2 grains made of magnesite, the surface of which have a coating of zirconia at least in sections;
• or
• 14.1.1.3 grains made of doloma, the surface of which have a coating of zirconia at least in sections;
• or
• 14.1.1.4 grains made of dolomite, the surface of which have a coating of zirconia at least in sections;
• 14.1.2 the grains for the production of the sintered refractory product comprised by the batch have a grain size of at least 2.8 mm;
• 14.1.3 wherein the proportion by weight of the coating of zirconia, in relation to the total weight of the grains for the production of the sintered refractory product comprised by the batch, is in the range from 1 to 50% by weight;
• 14.2 firing the batch to produce a sintered refractory product.

A sintered refractory product, the product comprising the following features:

• 15.1 the product comprises grains, which are sintered together;
• 15.2 the grains comprise first grains and second grains, wherein
• 15.3 the first grains comprise a subset of grains that comprise calcium oxide, wherein
• 15.4 the second grains are at least one of the following:
• 15.4.1 magnesia grains, the surface of which have a coating of calcium zirconate at least in sections;
• or
• 15.4.2 magnesite grains, the surface of which have a coating of calcium zirconate at least in sections;
• or
• 15.4.3 doloma grains, the surface of which have a coating of calcium zirconate at least in sections;
• or
• 15.4.4 dolomite grains, the surface of which have a coating of calcium zirconate at least in sections;
• and wherein
• 15.5 the second grains have a grain size of at least 2.8 mm;
• 15.6 the proportion by weight of the coating of zirconia, in relation to the total weight of the second grains, is in the range from 1 to 50% by weight.