PLANT FOR SLURRY COAL CONCENTRATION IN HELICAL SEPARATORS (VERSIONS) Russian patent published in 2013 - IPC B03B7/00 

FIELD: process engineering.

SUBSTANCE: set of invention relates to concentration of minerals and can be used at coal dressing plants. In compliance with first version, proposed plant comprises pulp feed line connected with inlet of first hydraulic cyclone for slurry classification with its sand outlet connected to first stage helical separator inlet. Said plant is equipped with second hydraulic cyclone for thickening of fine concentrate and helical separator of second stage. First stage helical separator outlet for concentrate is connected with arched screen inlet with its undersize outlet connected with fine concentrate sump. Sump fine concentrate outlet is connected with second hydraulic cyclone with its sand outlet connected with second stage helical separator inlet. Second stage separator fine concentrate outlet is connected with centrifuge inlet. Oversize screen outlet is connected with the same inlet of centrifuge. Centrate outlet of centrifuge filtration section is connected with fine concentrate sump. Centrate outlet of centrifuge precipitation section is connected with high-ash sludge sump. Note here that outlets of both cyclones and outlet of second stage separator are connected wit appropriate lines of feeding drainage into thickener. In compliance with second version, proposed plant incorporates no second stage helical separator while peck outlet of second cyclone is directly connected with centrifuge inlet.

EFFECT: extraction of coal particles sized to 0,04-1 (2) mm in one process step.

4 cl, 2 dwg