SciELO - Scientific Electronic Library Online

vol.115 issue2Thermophysical properties of rocks from the Bushveld ComplexTechnological developments for spatial prediction of soil properties, and Danie Krige's influence on it author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X


LIAOA, Yinfei; CAOA, Yijun; HUB, Zhongbo  and  TAOC, Xiuxiang. A new preparation scheme for a difficult-to-float coking coal by column flotation following grinding. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.2, pp.161-164. ISSN 2411-9717.

A new preparation scheme for a difficult-to-float coking coal from the Kailuan Mine, Tangshan, China was investigated. The results showed that grinding followed by column flotation was beneficial for obtaining products with low ash content. The positive effect of grinding on the coal floatability is attributed to the liberation of intergrowths and coal surface improvement. Tests indicated that 10 minutes was the optimum grinding time, and overgrinding resulted in a deterioration in flotation performance. With a grinding time of 10 minutes, conventional flotation had potential to yield a product with around 12.42% ash content and 69.15% combustible recovery. Column flotation can reduce the product ash content to 11.15% and increase combustible recovery to 74.47%. Consistently better flotation results reveal that column flotation is more efficient than conventional flotation for such fines.

Keywords : coal flotation; column flotation; grinding; difficult-to-float; liberation.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License