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四川各地蕴藏有大量的菱铁厂资源,多年来四川依靠这些资源发展了小型钢铁工业和小型炼铁厂,对支援农业和地方工业起了很大的的作用。但是,这些菱铁矿资源多属中小型矿床,含铁品位一般不高,多数在26—32％,经焙烧后含铁品位高的也只有47％左右。就脉石成分来说,有两个特点:一是含三氧化二铝比较高,二是含磷高。这是导致四川省小高炉焦比高、产量低、质量欠佳的重要原因之一。长期以来,四川各小铁厂对菱铁矿的处理多沿用氧化焙烧去除CO_2的工艺,在原料的处理上未曾改革。1958年,珙县铁厂曾对该地区的菱铁矿作过简单的焙烧——磁选试
There are a lot of resources of siderite plants in Sichuan Province. Over the years, Sichuan has relied on these resources to develop small-scale iron and steel industry and small-scale ironworks and played a large role in supporting agriculture and local industries. However, these siderite resources are mostly small and medium-sized deposits, iron grade is generally not high, the majority of 26-32%, after roasting high-grade iron is only about 47%. On the gangue composition, there are two characteristics: First, with higher alumina, and second, high phosphorus. This is one of the important reasons that the small blast furnace in Sichuan Province has a high coke ratio, low yield and poor quality. For a long time, the treatment of siderite in small iron mills in Sichuan Province all followed the process of removing CO_2 by oxidation roasting and had not been reformed in the treatment of raw materials. In 1958, the Tiexian Iron Works had conducted a simple roasting of siderite in the area - a magnetic separation test