earthy iron ore

用法例句

The relationship of aim mineral in ores fluorite and crypto-crystal quartz is very close ,the content of quartz is high,over 50%,its partical very fine,and there are some mud minerals in the ores.

矿石目的矿物萤石与细粒隐晶质石英关系极为密切,石英含量高,达50%以上,且呈极细粒状产出在萤石中,另外还含有泥状矿物(高岭土),提高萤石品位,降低精矿中硅含难度较大。