原生矿泥对鳞片石墨浮选影响机制研究

我国风化石墨矿储量大,成分复杂,石墨精矿固定碳回收率低。为高效利用风化石墨矿,本文以萝北县云山石墨矿风化矿石矿泥中所含石英、云母、绿泥石、褐铁矿、高岭土等矿物为对象,研究原生矿泥对石墨浮选效果的影响机制,并探索了减小矿泥影响的方法。研究表明,影响石墨浮选的主要原因是矿泥和石墨发生了异相凝聚,云母、高岭石和褐铁矿在石墨表面罩盖严重,长石和绿泥石在石墨表面发生了微弱罩盖,石英和透辉石由于泡沫夹带上浮的可能性较大;水玻璃和六偏磷酸钠作为组合抑制剂使用能有效改善矿泥对石墨选矿的影响。

Effects from changes in pulp nature after ultrasonic conditioning on high-sulfur coal flotation

A study of the effects of the pulp nature on desulphurization and de-ashing during high-sulfur coal flotation is described in this paper. Highlighted are the use of a solution oxygen gauge, a pH value gauge and a surface tension gauge to investigate changes in the pulp nature related to changes in the oxygen content, the pH value and the interfacial tension. The temperature be- fore and after ultrasonic conditioning was also investigated. The results showed that ultrasonic conditioning resulted in a decrease in the oxygen content and the interracial tension and an increase in the pH value and the temperature of the pulp. The perfect index of flotation and the perfect index of desulphurization of fine coal increased by 25.19% and 18.03%, respectively, after the pulp was ultrasonically conditioned. This study shows that ultrasonic conditioning can change the pulp nature and enhance the degree of desulphurization during high-sulfur coal flotation.

氧化法制备氟化石墨烯及其性能研究

以氟化石墨为原料,通过改进的Hummers法制备出氟化石墨烯,通过XRD、FTIR、SEM、TEM、TG和UV-vis对氟化石墨烯和氟化石墨进行表征,结果表明:通过改进的Hummers法制备的氟化石墨烯为含氧氟化石墨烯,氟化石墨烯层数为5层;与氟化石墨相比,晶面间距由0.34 nm增加到0.62 nm,在制备氟化石墨烯过程中引入的含氧官能团以C—O为主;含氧官能团的存在导致氟化石墨烯热稳定性能下降;以该种方法制备出的氟化石墨烯禁带宽度为2.99 eV,是具有一定带隙的半导体材料。

鳞片石墨浮选药剂研究进展

文章介绍了鳞片石墨浮选捕收剂、起泡剂和调整剂的研究和应用现状,比较了同类型药剂的作用效果,总结了捕收剂、起泡剂和调整剂最新研究成果,指出高效、低成本、来源广泛的药剂仍是研究的重点,研究复合药剂简化加药环节以及药剂的绿色环保是将来的发展趋势。

超声波对煤和石墨浮选影响研究进展

人们一直寻找提高细粒煤和石墨矿物浮选效率的方法,大量研究表明超声处理是较理想的一种方式。超声处理对煤和石墨矿物颗粒影响有清洗煤和石墨表面矿泥、剥蚀煤和石墨表面氧化层、破碎煤和石墨颗粒和改变煤和石墨表面电位等;超声处理对矿浆体系的影响有乳化浮选药剂、改变矿浆性质等,超声处理增大了目的煤和石墨和非目的煤和石墨性质的差异。研究证明,超声处理是提高细粒煤和石墨浮选效果的一种理想方法。