有机质在铀矿加工中的行为

本文研究了有机质在氧化焙烧、酸浸、碱浸过程中的氧化还原作用和腐植酸的再生及试剂消耗情况,对有机质试样进行了矿物学特性的研究。结果表明,含挥发碳高、缔合程度和演化阶段低的有机质,酸浸时易被氧化剂氧化,消耗的氧化剂较多;碱浸时易被氧化再生腐植酸;氧化焙烧预处理有利于铀的氧化。相反,含固定碳高、缔合程度和演化阶段高的有机质,酸浸时不易被氧化剂氧化,消耗氧化剂较少;碱浸时难以再生腐植酸;氧化焙烧预处理易使铀还原,并使铀浸出性能降低。

BEHAVIOUR OF ORGANIC MATTERS IN URANIUM ORE PROCESSING

The oxidation-reduction behaviour of organic matters in the course of oxidation roasting, acid leaching and alkali leaching, the regeneration of humic acid and the consumption of reagents are described in this paper. The mineralogical characteristics of the organic matter samples were studied. The results show that its organic matter rich in volatile carbon and with the shorter evolutionary process andlower association is easily oxidized with higher consumption of oxidant during its acid leaching; it is easi ly oxidized with forming humic acid during alkali leachingj and pretreating it by oxidation roasting is beneficial to the oxidation of uranium. On the contrary, the organic matter rich in fixed carbon,and with longer evolutionary process and higher association is difficultly oxidized with lower consumption of oxidant during its acid leaching; it is difficult to regenerate humic acid for it during alkali leaching; and the uranium can be easily reduced and the leaching performance of uraniium can be lowered.