Effect of MO Collector on Coal Gasification Fine Slag Flotation

This is an article in the field of mineral processing engineering. Comprehensive utilization of coal gasification fine slag is a major development direction at present. Coal gasification fine slag has developed pores and rich oxygen groups, which makes it difficult for kerosene and other traditional collectors to recover the residual carbon. Flotation experiments were carried out on the compound MO of methyl oleate and kerosene, and the mechanism was discussed by means of laser particle size analyzer, FTIR, contact angle, and XPS. The results show that when the dosage of MO is increased to 16 kg/t, the loss on ignition of tailings is reduced to 7.12%, and the recovery of combustible is more than 95.63%. MO introduced polar group ester group, which can reduce the interfacial tension of kerosene surface, enhance the dispersing effect of collector in water, so as to increase the contact area and collision probability of carbon residue particles and collector droplet, and improve the hydrophobicity and floatability of carbon residue particles. The hydrophobicity of carbon residue was analyzed by contact angle and the relationship between the hydrophobicity and the rate of fine mineral was explained. XPS shows that the interaction between MO and oxygen-containing functional groups on the surface of the carbon residue can form an effective covering layer at the hydrophilic water level point of the carbon residue, which makes the hydrophobic part outward, reduces the hydration, increases the contact probability, and increases the surface hydrophobicity of the coal gasification fine slag. The use of MO agent provides a new way for comprehensive utilization of solid waste from coal gasification.