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弗吉尼亚铁煤焦公司所属的汤姆·格里克选煤厂的生产能力为500t/h。1987年投产后发现入厂原煤比预计的要细,且杂质也多(下表),这就带来了下列问题。
The production capacity of the Tom Grick Coal Preparation Plant owned by the Virginia Iron Coke Company is 500 t / h. After it was put into operation in 1987, the foundry coal was found to be finer than expected and there were many impurities (table below), which led to the following problems.