Apatite was separated from fault-clay, fracture-cliff rock and fracture wall rock, which were collected from Huangkou fr......

本文对用粉煤灰制肥料的可行性进行了研究,选用磷矿石、助熔剂,添加剂和粉煤灰以适当的比例混合后熔融,使混合物料中的非枸溶性成......

取自华北临清拗陷深钻井中的磷灰石,其裂变径迹年龄从井浅部到底部递减,年龄由80Ma 减到1Ma。径迹发生退火的温度范围在75—127℃,......