论文部分内容阅读
用离子性改性药剂改性磁铁矿粉,再用非离子性改性剂聚乙二醇-4000(PEG-4000)进行二次包覆,提高磁铁矿粉表面疏水性.结果表明,油酸钠和PEG-4000使磁铁矿粉表面由亲水性变为疏水性,以油酸钠作改性剂,最佳改性条件为:80℃,30 min,2%改性剂用量,20%矿浆浓度;以PEG-4000作改性剂,最佳改性条件为:40℃,30 min,2%改性剂用量,20%矿浆浓度.改性后磁铁矿粉临界水分可由0.5%提高到0.8%.以改性磁铁矿粉作为加重质,形成的流化床具有良好的分选性能,采用6~13 mm原煤,分选密度为1.57 g/cm3时,可能偏差E值达0.068.
Magnetite powder was modified with ionic modification agent and then coated with PEG-4000 as nonionic modifier to improve the surface hydrophobicity of magnetite powder.The results showed that, Sodium oleate and PEG-4000 make the surface of magnetite powder change from hydrophilic to hydrophobic, with sodium oleate as modifier, the optimum modification conditions are: 80 ℃, 30 min, 2% modifier dosage , 20% of pulp concentration.The optimal conditions of modification were as follows: 40 ℃, 30 min, dosage of modifier 2%, concentration of pulp 20% 0.5% to 0.8% .The modified magnetite powder as a heavier, the formation of a fluidized bed with good separation performance, the use of 6 ~ 13 mm raw coal, sorting density of 1.57 g / cm3, the deviation may be E Value of 0.068.