CAJ | 학술논문

华南花岗岩型铀矿床是我国重要的铀资源之一,主要采用堆浸法提取铀。本文实验研究了铀矿石的地质地球化学特征对铀浸出的影响。根据地质地球化学特征,铀矿石可以分为2个类型,Ⅰ类是发育赤铁矿化,呈暗红色,Fe2 O3含量较高,Ca、Ma、Al含量较低；Ⅱ类是发育绢云母化和碳酸盐化,呈灰绿色,Fe2 O3含量较低,Ca、Ma、Al含量较高。铀浸出动力学受表面化学反应控制,矿石的地质地球化学特征对铀的浸出有显著影响,Ⅰ类矿石铀的浸出率、铀浓度和浸出速率常数显著高于Ⅱ类矿石。矿石中的赤铁矿为铀浸出提供氧化剂Fe3+,从而促进铀的浸出；碳酸盐矿物一方面消耗酸,另一方面形成沉淀物,从而对铀浸出产生不利影响。
화남화강암형유광상시아국중요적유자원지일,주요채용퇴침법제취유。본문실험연구료유광석적지질지구화학특정대유침출적영향。근거지질지구화학특정,유광석가이분위2개류형,Ⅰ류시발육적철광화,정암홍색,Fe2 O3함량교고,Ca、Ma、Al함량교저；Ⅱ류시발육견운모화화탄산염화,정회록색,Fe2 O3함량교저,Ca、Ma、Al함량교고。유침출동역학수표면화학반응공제,광석적지질지구화학특정대유적침출유현저영향,Ⅰ류광석유적침출솔、유농도화침출속솔상수현저고우Ⅱ류광석。광석중적적철광위유침출제공양화제Fe3+,종이촉진유적침출；탄산염광물일방면소모산,령일방면형성침정물,종이대유침출산생불리영향。
The granite uranium deposits in south China are one of important uranium re-sources,and uranium is mainly extracted using heap leaching. The influence of geological and geochemical characteristics of ores on uranium leaching was experimentally studied in this paper. Accrrding to geological and geochemical characteristics,uranium ores can be di-vided into two types:type Ⅰ is kermesinus with hematization,and high content of Fe2 O3 , low content of Ca,Mg,Al-bearing minerals;typeIIis grayish-green with sericitization,car-bonatation,low content of Fe2 O3 ,and high content of Ca,Mg,Al-bearing minerals. The ki-netics of uranium leaching are controlled by surface chemical reaction. The uranium leac-hing is affected obviously by geological and geochemical characteristoics of ores. The leac-hing efficiency, concentration and leaching rate constant of uranium for typeⅠores are higher than for type II ores. The dissolution of hematite from ores provide oxidant Fe3+which promote uranium leaching. But carbonate minerals can consume acid and form new precipitates thus be unfavourable to uranium leaching.