Analysis of improving the quality of coal slurry based on the use of regression models

The article presents the results of research on the enrichment of fine-grained coal grades, also known as coal slurries. The research was carried out on a semi-technical scale, using the method of gravity flow enrichment on a spiral separator type Reichert LD-4. The research material used in the research were three types of coal slurries, diversified in qualitative terms that were taken from technological process of the preparation plants. The enrichment efficiency tests were carried out in relation to changes in the density of the feed directed to the separator. The best distribution results for all tested coal slurries were obtained for the feed density of β = 300 g/dm³, where weighted averages of ash content in the obtained concentrates reached values of several percent. A statistical analysis was also performed, to which the multiple regression model was used. Using the constructed models, it is possible to determine which technological parameters affect the process of enriching coal sludge.