Melesse Alemayehu (PhD)Ijara Tesfaye (Mr.) (Co-Advisor)Abraham Feyisa2024-05-022024-05-022023-09https://etd.aau.edu.et/handle/123456789/2943In Ethiopia, coal mining is a significant economic activity. The existence of clay slimes, which have an impact on the quality and amount of coal, is just one of many difficulties that coal mining activities must overcome. These problems regarding the impact of clay slime on coal flotation were the focus of this study project. Using flotation mixtures containing slime particles and coal particles in the 0.5-0.25 mm, 0.25-0.125 mm, and 0.125-0.063 mm size ranges, batch flotation and flotation rate tests were conducted with the primary goal of examining the impact of slimes on the recovery of coal particles by flotation. The findings of this study suggest that the content of slime particles and coal particle size had a bearing on the influence of sludge particles on the coal flotation recovery. Recovery of coal ash by flotation in all size fractions in the mixed flotation was larger than that of coal granules in each flotation cell when the mass proportion of the slime particles was below 20%. However, when the particle mass ratio of the slime exceeded 20%, the former was lower than the latter. Additionally, as the percentage of slime particles increased, coal particle recovery using flotation across all size fractions dropped. Additionally, it was easier to see how slime particles affected the Recovery via flotation of coarse coal particles.en-USCoal flotationclay slimescoal recoveryparticle sizeThesis