Batch for the production of a coarse ceramic refractory basic product, such product and method for its production, lining of an industrial furnace and industrial furnace

A dry batch for the production of a coarse ceramic, refractory, shaped, fired or unfired magnesia spinel product, comprising a dry substance mixture consisting of either:

• a) a granular magnesia component of at least one magnesia having an MgO content <91.5 ma.-%, as the main component in an amount of ≥70 ma.-%, and
• a granular elastifier component in an amount of 2 to 10 ma.-% of at least one sintered bauxite with an Al2O3 content of 70 to 92 ma.-%, the elastifier component having a grain size according to DIN 66165-2:2016-08≤2.5 mm, and the elastifier component having grains with a grain size according to DIN 66165-2:2016-08 of ≤0.5 mm at most in an amount of ≤25 ma.-%,
• or
• b) the granular magnesia component of a) as the main component, the granular elastifier component of a), and a further granular magnesia component of at least one magnesia with a higher MgO content than the main component,
• wherein the average MgO content of all magnesia grades of the dry substance mixture taken together is 85 to 91.5 ma.-%.