AbstractParticle technology is concerned with the problems of dealing with matter in a finely‐divided state. Its importance cannot be over emphasized today in view of its relevance, for example, to waste treatment, environmental problems and the efficient recovery and beneficiation of ores and fossil fuels.This paper discusses the author's involvement in particle technology research relating to fluid‐particle systems and size enlargement processes. The innovative solution of practical problems through development of a background of knowledge from continuing basic studies is emphasized. Specific examples are cited in the areas of separation by particulate gas fluidization, dence phase conveying, upgrading of waste particulate material, balling circuit design and operation, and the beneficiation of coal fines with tailings recov