NEARLY 30 YEARS OF EXPERIENCE WITH LURGI CALCINERS AND INFLUENCE CONCERNING PARTICLE BREAKAGE

摘要

Following the development of the circulating fluid bed calciners (CFB) at the Nabwerk and Luenen VAW plants, in 1973 AOS became the first alumina plant in the world to 100 % employ this technique. AOS installed three calciners with a designed capacity of 650 t/d each. Since AOS was built as floury type alumina plant, the demand of the smelters needed several modifications of the alumina quality. The goals, a coarse material and lower particle breakage, were met by several modifications. This paper will present the modification of the calciners and the influence on the hydrate quality regarding particle breakage.