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The flotation performance of ultrafine particles is affected by many factors, especially surface hydrophobicity and agglomeration behaviors. As a solid waste, ultrafine low-rank coal (ULC) possesses poor hydrophobicity, which caused its poor flotation performance. Hence, the key to the economic recovery of ULC is to improve its hydrophobicity. This research reported a graft copolymer, polyacrylamide grafted polyvinylpyrrolidone (PVP-g-PAM), which was effective in the surface hydrophobic modification and agglomeration of ULC. PVP-g-PAM used in this study was synthesized by a microwave-initiated process and has been characterized through elemental analysis, XPS, FT-IR, and SEM measurements. The contact angle offered a direct observation of the hydrophobic effect of PVP-g-PAM on ULC. The agglomeration test proved that the size of agglomerates of ULC was enhanced with the presence of PVP-g-PAM. The enhanced agglomeration of ULC induced by PVP-g-PAM solved the issues of low flotation recovery. The hydrophobic modification effect of the graft copolymer indicated the advantage of PVP-g-PAM in the purity and flotation rate of ULC concentrate. The addition of copolymers was found to be an effective method for the enhancement of ULC flotation.

Improving ultrafine low-rank coal flotation using polyacrylamide grafted polyvinylpyrrolidone