RESEARCH OF THE POSSIBILITY OF SLAG AND ASH PROCESSING BY THE FLOATATION METHOD ON KHABAROVSK POWER PLANT-1

Abstract

The question of coal slag and ash processing is important because of accumulation of great quantity of coal slag and ash dump. The dumps cause environmental problems, dusting and polluting by toxic elements. Coal ash dumps contain substantial quantities of unburnt particles of coal. It is a recycled source of energy when extracted. In can be used in fuel briquettes production, as a rubber filler instead of graphite. Low LOI coal ash can be applied in production of structural materials. But coal ash should be cleared from unburned coal particles before.
The most efficient method of extraction of the unburnt particles of coal is flotation. Influence of the reagent composition and the collector consumption on flotation process is investigated. It is established that increase of collector consumption (kerosene) over 5 kg/t does not lead to increase in technological indicators of floatation processing. Experiments were carried
out both on coarse and fine material. Coal ash crushing before floatation promotes formation of fresh surface and more efficient collector adhesion. The reduction in the size of the material provides the predominance of the lifting force of the bubbles when attached to a particle of a smaller size. The carbon content in the flotation concentrate increases with its release
from the class –0,15 mm, compared with the enrichment of the material size. Fine material provided 15% increase in concentrate output.