Effect of Grinding Methods on Floatability of Magnesite

Vertical roller mill is a high-efficiency and low-carbon grinding equipment integrating "crushing, grinding, drying and grading". It has the advantages of simple structure, high reliability, short process flow and small space occupation. The effect of vertical roller mill grinding, ball mill dry grinding and ball mill wet grinding on the floatability of magnesite was carried out for a magnesite in Kuandian, Dandong. The results showed that the recovery rate of magnesite in vertical roller mill grinding was significantly higher than that in other two grinding methods. According to specific surface area analysis, AFM detection and reagent adsorption test, compared with ball mill dry grinding and ball mill wet grinding, vertical roller grinding products had higher surface roughness (2.76 nm) and larger specific surface area (0.2594 m²/g). This also leaded to a greater adsorption capacity of collectors on the grinding products of vertical roller mills, which was more conducive to the flotation of magnesite in the sodium oleate system.