人们将钢铁的重要比做工业的“元帅”;发展钢铁工业就需要有丰富的铁矿。提起铁矿,许多人不会想到,铁矿中还有一种像石灰岩那样的浅青灰或白色的铁矿石,这就是难识别的菱铁矿。自然界中已知含铁矿物有300余种,但目前能作为工业开采利用者,除磁铁矿、赤铁矿、褐铁矿外,就是菱铁矿了。菱铁矿,通常含铁35%,焙烧至600°～700℃后,含铁量可达50%以上,成为可直接入 People compare the importance of steel to the “marshal” of industry, and the development of iron and steel industry requires rich iron ore. Lift iron ore, many people will not think of iron ore there is a light limestone or white iron ore, which is difficult to identify siderite. There are more than 300 kinds of iron-bearing minerals known in nature, but currently they can be used as industrial miners. In addition to magnetite, hematite and limonite, they are siderite. Siderite, usually 35% iron, roasted to 600 ° ~ 700 ℃, the iron content of up to 50%, as can be directly into