Patent ID: 8030236

Claim:
A coarse-ceramic refractory batch (mix) comprising: a) at least one granular, refractory, mineral basic main component comprising one of an MgO- and a MgO and CaO-based refractory material and b) at least one granular, refractory, mineral, MgO-based, spinel-free elasticizing additive in a form selected from a group consisting of: b1) a forsterite material additive having the following particle size distribution: 1-6 mm: from 50 to 100% by weight, in particular from 70 to 80% by weight 0.25-1 mm: from 0 to 50% by weight, in particular from 20 to 30% by weight; and b2) a granular component additive composed of small shaped bodies which as ground powder mixtures comprise only the forsterite materials for in-situ formation of said forsterite material and have a particle size of from 0.3 to 8 mm, whereby the small shaped bodies are a mixture of ground powders of at least one MgO- and at least one SiO 2 -component; whereby the additive being present in the batch (mix) in an amount which elasticizes the main component; and wherein said main component is present with the following particle size distribution, preferably in combination with the additive in a particle size distribution of a typical Fuller curve: 1-8 mm: from 20 to 50% by weight, in particular from 45 to 50% by weight, 0.25-1 mm: from 10 to 30% by weight, in particular from 15 to 20% by weight, <0.25 mm: from 20 to 60% by weight, in particular from 25 to 30% by weight.