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, the grains comprising the following features:

• 6.1 the grains 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 have a grain size of at least 2.8 mm.

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, the grains comprising the following features:
• 14.1.1 the grains are made of at least one of the following grains:
• 14.1.1.1 grains made of magnesia, the surface of which have a coating of zirconia at least in sections;
• or
• 1.4.1.1.2 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 have a grain size of at least 2.8 mm.
• 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 calcium oxide comprising grains, wherein
• 15.4 the second grains are at least one of the following grains:
• 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.