Extenders for paints - specifications and methods of test - part 21 : silican sand unground natural quartz 涂料用填料.规范和试验方法.第21部分:石英砂
A . physical - index : the main component in quartzite is quartz . its density is about 2 . 65 g cm2 石英砂系列产品：精制石英砂，半精制石英砂，普通石英砂，加工工艺
Products used for treatment of water intended for human consumption - silica sand and silica gravel ; german version en 12904 : 2005 人类生活用水处理用制品.石英砂和石英砾石
It contains the deeply dissected bungle bungle range composed of devonian - age quartz sandstone eroded over a period of 20 这些成行成列的塔形或圆锥形的山峦，由泥盆纪时代的石英砂构成。
Results indicated that mn , fe , al were the main elements consisting in the darkened coating of the sand media 研究表明：石英砂滤料表面的黑化物质主要是锰、铁、铝等金属元素富集的结果。
Extenders for paints - specifications and methods of test - part 21 : silica sand unground natural quartz iso 3262 - 21 : 2000 ; german version en iso 3262 - 21 : 2000 涂料用填充剂.规范和试验方法.第21部分:石英砂
The sodium borohydride can be obtained by deoxidation of the aforementioned sodium metaborate as raw material in the presence of metalic sodium and quartzite 以偏硼酸钠为原料，与金属钠、石英砂进行加氢反应来制备硼氢化钠。
The quantity of aluminum soil mineral , the quartz sand and mineral of tai are more abundant , are the mineral that have more development potential species in kunming 铝土矿石英砂及钛矿储量较为丰富，是昆明较有开发潜力的矿种。
The mineral resources mainly have lin , salt , iron , tai , coal , quartz sand , aluminum soil , the gui stone . etc . , the lin , salt , iron mine are most for enrich 矿产资源主要有磷盐铁钛煤石英砂铝土石等，其中以磷盐铁矿最为丰富。
Export company has been specializing the slate and turquoise with the mining , processing and export as a whole since 1981 湖北省竹山县荣禄石材有限公司公司成立于1994年，是一家集矿山开采，生产加工和出口销售的板石和石英砂专营性企业。
