简介：Cesiumcontentintheseawateris3.0910-4mg·L-1,andammonium-typemordenitewasusedtoexchangecesiumfromcesiumsource.K-typemordenitewasobtainedbyhydrothermalsynthesismethod.Afterammonium-modified,ionexchangepropertiessuchassaturatedionexchangecapacitiesandselectivitycoefficientsforalkalimetalionsweredetermined.Atthesametime,ionexchangeisothermalcurvesofammonium-typemordeniteforCs+andNH4+weredeterminedat25°C.Pitzerelectrolytesolutiontheorywasusedtoworkoutactivitycoefficientsofthesystem,andtheKiellanddiagramoftheionexchangesystemwasobtained.Thecalculatedequilibriumconstant(Ka)andionfreeenthalpy(DG0)ofmordeniteforCs+andNH4+are1.455and-930.3J·mol-1,respectively,indicatingthationexchangeprocessofammonium-typemordeniteforcesiumisaspontaneousprocess.

简介：记者日前从昆明海关了解到，今年以来，云南省钢铁类材料出口继续延续上年高增长势头，仅1—4月份出口量就达12．2万吨，出口总值4949万美元，较去年同期分别增长2．3倍和2．1倍，增长速度较快。

简介：据俄罗斯伊尔库茨克地区官员透露。该地区2005年黄金产出下降了2．3％，为15．2吨；砂金产量为12．685吨。复成矿产出较2004年翻番，达到2．498吨。