The Oxidation Coal Effect Over a Colombian Coal Structure

Reverse Flotation of Taixi Oxidized Coal

“…In China, Taixi oxidized coal has a low hydrophobicity. Using common oily collectors (dodecane and diesel) to float this oxidized coal is very difficult to obtain a high concentrate yield. − Meanwhile, other oxidized coals around the world have many difficult-to-float properties that are similar to those of Taixi oxidized coal. − Jena et al conducted a comprehensive study on the flotation characteristics of oxidized Indian high ash sub-bituminous coal, and they found the floatability of oxidized coal could be improved by aliphatic alcohols . The oxidation processes usually reduce coal floatability through the formation of oxygen functional groups, such as carboxyl, phenolic, and carbonyl functionalities on coal surface.…”

“…The oxidation processes usually reduce coal floatability through the formation of oxygen functional groups, such as carboxyl, phenolic, and carbonyl functionalities on coal surface. The oxygen functional groups can increase the number of hydrophilic sites that can be bonded with water molecules by hydrogen bond. ,,− According to this situation, researchers attempted to find several effective techniques or methods to increase the flotation recovery of oxidized coal, that is, direct contact flotation procedure, , microwave pretreatment, grinding pretreatment, ,,,− surfactants, , and new collectors. ,, …”