简介:ChinaNationalNon-FerrousMe-talsI/Ecorporation,InnerMon-goliaBranchwilltakepartinthe“1991AmericanLosAngelesExhibition”tobeheldatshrineAuditoriumonSept.16,1991.TheCorporationmainlyengagedinthetradeofREproducts,nonferrousmetals,ferrousalloy,etc.OnthismeetingitwillsellallkindsofREproductsinclu-dingindividualREoxidesandmetals,Nd-Fe-B.magneticmate-rials,non-ferrousmetalswhich
简介:Recently,reportersofXinhuaNewsAgencyin-terviewedDr.LiDongying,amemberofRELeadingGroupundertheStateCouncil,alsotheViceChair-manofChinaNon-FerrousMetalsSociety,abouthisopinionsonREindustryinChina.Mr.Lisaid:“RareEarthsarenotstructuralma-terials,sotheconsumptionismuchsmallerthanthatofaluminium,copper,ironandsteel.Buttheadding
简介:In2018,undertheguidanceofPresidentXiJinping'sThoughtonSocialismwithChineseCharacteristicsforaNewEra,China'srareearthindustryhasmadesteadyprogresswithsignificantimprovementinoverallefficiency,aconstantimprovementinmanagementsystemandasteadyimprovementindevelopmentquality.
简介:彭水水电站大坝为混凝土弧形重力坝,最大坝高为116.5m,右岸布置地下式厂房,左岸为通航建筑物。坝址岩体为灰岩、白云岩及页岩,岩层间分布有较多的软弱夹层,它的性状、分布特征及抗剪强度影响枢纽建筑物的总体布置,且彭水水电站有较多的地下洞室,对洞室围岩稳定有较大影响,为此对软弱夹层进行了专题研究。研究表明:软弱夹层的性状特征受地层岩性、地质构造和地下水的控制。在地下水水循环条件较好的岩溶发育区和构造发育地段,软弱夹层较发育,且性状较差。各类软弱夹层的主要化学成分相同,含量存在明显差异,Ⅰ和Ⅱ类以SiO2和Al2O3为主,Ⅲ类则以CaO和MgO为主。矿物成分以伊利石为主,次为高岭石和蒙脱石。软弱夹层的抗剪强度受夹层厚度、物质成分、性状、起伏差等因素的影响,差异性大。