桂中高铁三水铝土矿成矿特征、资源总量预测与开发前景

Metallogenic Characteristics,Prediction of Total Mineral Resources and Development Prospect for High-Iron Gibbsite-Type Bauxite Ore in Central Guangxi

桂中高铁三水铝土矿由泥盆系—二叠系等不纯碳酸盐岩经强烈红土化作用形成,矿体均呈层状、似层状赋存于岩溶准平原区内的第四系更新统红土风化壳中,并受矿源层、构造、古气候、地形地貌等条件控制;成矿过程经历了碳酸盐岩溶解-淋滤、高岭土化、红土化富集3个阶段。运用基于G IS的"矿床模型综合地质信息预测方法"对桂中高铁三水铝土矿进行了综合定位和定量预测,共圈定42个最小预测区,预测资源总量10.30亿t。通过"先铁后铝"或"先铝后铁"选冶方案综合回收高铁三水铝土矿中的铁和铝,其潜在价值达4 000～4 900亿元,开发前景十分乐观。

The high-iron gibbsite-type bauxite ore deposit in Central Guangxi is formed through the intensive laterization of impure carbonate rocks from Devonian to Permian. Its layer or layer-like ore body exists in the weathering crust of red soil of the Pleistocene of Quaternary in karst peneplain, which is controlled by the source bed, geological structure, palaeoclimate, topographic relief, and geomorphic feature. The ore-forming process can be divided into three stages： the dissolution and leaching of carbonate rock, the kaolinisation, and the en- riching during laterization. The bauxite ore deposit is comprehensively localized and quantitatively predicted by the GIS-based ＂Deposit Model and Comprehensive Geological Information Prediction Method＂. There are 42 minimal areas predicted with a totalbauxite resource of 1 030 million tons, showing a promising developing prospect with a potential value of 400 -490 billion Chinese Yuan. Iron and aluminium can be comprehensively recovered from thebauxite ores through the ore processing and metallurgical methods of ＂iron before aluminium＂ or ＂aluminium before iron＂.