Batch for producing a refractory ceramic product and process for its preparation

Composition for the production of a refractory product to attain the following wt .-% be added to 100 mineralogical phases: 70-98 wt .-% of a stoichiometric MgO-Al 1.1 wt .-% of a 70-98 non-stoichiometric MgO-Al 1.2 2-30 wt .-% of mullite 1.3 up to 10 wt .-% others.