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机构地区:[1]武汉理工大学资源与环境工程学院,武汉430070
出 处:《武汉理工大学学报》2014年第11期119-123,140,共6页Journal of Wuhan University of Technology
摘 要:以油酸和改性油酸为胶磷矿捕收剂,研究了改性前、后油酸的物化性能及浮选特性。物化性能研究结果表明:改性后油酸因引入过氧羟基,酸值和临界胶团溶度均增大,溶解分散性提高;碘值不变,分子中CC双键没有遭到破坏。浮选试验结果表明,改性油酸耐低温性有了显著改善,温度由55℃降低到15℃,磷精矿品位和回收率仅分别降低1.48%和2.98%,可实现常温正浮选;改性油酸的捕收性和选择性明显提高,精矿产率相同时,捕收剂用量减少45.86%,精矿品位相同时,回收率提升值为5%-8%。浮选动力学研究表明:改性油酸的浮选速度常数和最大回收率分别提高了29.45%和8.17%,具有更快的浮选速率和对磷灰石更好的回收效果。The differences of physico-chemical properties and flotation performance between oleic acid and modified ole- ic acid were investigated using apatite flotation as collector. The results of physico-chemical properties tests showed that the dissolution and decentralize properties of oleic acid were enhanced with the acid value and critical micelle concentration increasing in presence of the hydroxyl peroxide. It indicated that the C =C double bond in the oleic acid molecule do not damaged when iodine value was constant. The results of flotation experiments revealed that the low temperature resistance of modified oleic acid improved significantly and the normal temperature direct-flotation would become a reality. The grade and recovery of concentrate reduced by 1.48% and 2. 98% respectively when the flotation temperature varied from 55℃ to 15 ℃. The dosage of modified acid decreased by 45.86% under the condition of same concentrate yield as well as the recovery of concentrate increased by 5 %-8% at the same concentrate grade, so it could conclude that the collecting performances and selectivity of oleic acid enhanced in presence of the hydroxyl peroxide. The results of flotation kinetics showed that the flotation rate constant and the maximum recovery of the modified oleic acid increased by 29. 45% and 8. 17% respectively. It showed that the modified oleic acid was a better collector than oleie acid with the faster flotation rate and the better recovery effect for apatite.
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