It is studied on extracting alumina from fly ash by the way of limestone sinter and self powdering, discusses the influence of the sintered conditions of powder on alumina leaching.
Available standard MA-spinel bricks differ mainly in the type of magnesia and in the amount and type of their alumina carrier (sintered and fused MA-spinel, calc. alumina, white fused alumina, etc. )
Ash content of the additions is close to zero, therefore organic additions can't influence on the structure and property of sintered high-alumina ceramic material.