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为了开发利用低品位菱铁矿，采用煤基回转窑法，在12m长回转室内，对凌源市沟门子乡贫菱铁矿进行了预还原工业性试验。结果表明：预还原矿石品位提高到55％±，金属化率达到60％±。以30％配比加入186m3高炉冶炼，炉况顺行，产量增加5％，焦比大幅度降低。
In order to exploit and utilize low-grade siderite, a coal-based rotary kiln method was used to carry out pre-reduction industrial tests on the lean siderite in Goumenzi Township, Lingyuan City within a 12m long rotary chamber. The results showed that the grade of prereduced ore increased to 55% ± and the metallization rate reached 60% ±. To 30% of the proportion of 186m3 blast furnace joined the furnace, furnace conditions, the output increased by 5%, significantly reduce the coke ratio.