RECOVERY OF ALKALI METAL CONSTITUENTS FROM COAL CONVERSION RESIDUES

摘要

A coal gasification operation (32) or similar conversion process is carried out in the presence of an alkali metal-containing catalyst producing char particles containing alkali metal residues. Alkali metal constituents are recovered from the particles by burning the particles (45, 55) to increase their size and density and then leaching the particles of increased size and density with water, to extract the water-soluble alkali metal constituents.