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成都地区的土铁都是用土焦来熔化的,这些土焦内夹着很多的耐火材料、石灰石、原煤片,因而灰份很高,一般都在20—25%,有的达到31%。焦的块度很大,但稍敲一下即打得很碎,铁水温度总提不高,使废品率高达50%以上。但一提到提高温度,很多同志就把增加焦炭用量作为灵药。如成都望江机器厂曾将底焦加到2公尺。成都鼓风机厂等厂的层焦加到85公斤(炉径900公厘),焦铁比低到0．75。结果温度并不高,却使生产率大为降低。
Chengdu iron soil are used to melt the earth coke, sand coke inside a lot of refractories, limestone, raw coal films, which are high in ash, are generally 20-25%, and some 31%. Coke block is very large, but a little tap that is very fragmented, the total temperature of the molten iron is not high, the rejection rate as high as 50%. But when it comes to raising the temperature, many comrades regard increasing the amount of coke as a panacea. Such as Chengdu Wangjiang Machine Factory had coke added to 2 meters. Chengdu blower factory plant layer coke added to 85 kg (900 mm furnace diameter), iron coke ratio as low as 0.75. As a result, the temperature is not high, but the productivity is greatly reduced.