不同碳链长度酯类捕收剂对低阶煤浮选效果的影响OA

This paper aims to address the poor flotation effect and high drug consumption of tradition-al hydrocarbon oil collectors.By taking the methyl hexate,methyl caprate,methyl decarate,methyl nut-meg ester and methyl stearate with different carbon chain lengths as trapping agents,the study conducts the flotation tests on the low-leves coal in Ningdong by using the contact angle testing,infrared spectral a-nalysis and molecular dynamics simulation to reveal the mechanism of the flotation effect of low-order coal enhanced by the ester collectors with different carbon chain lengths.The results show that except the methyl acetate,the methyl decarate,methyl nutmegate and methyl stearate have better flotation effects than kerosene,and the flotation performance gets better first and then worse along with the increase in length of the carbon chain,among which the methyl nutmegate exhibits the best flotation performance.The addition of methyl nutmegate can significantly increase the contact angle of the surface of the coal sample,reduce—OH,C—O hydrophilic groups,and improve C—H hydrophobic groups,enhancing the hydrophobicity on the surface of the low-order coal,while following methyl decaproate and methyl stearate relatively.The tomolecular simulation shows that the ester collectors can form the hydrogen bonds through the oxygen-containing actor groups on the coal surface and the oxygen atoms in the ester group to modify the water-water-friendly points,and the hydrophobic carbon chain eliminates the water molecules at the interface by Van der Waals for enhancing the surface hydrophobicity.