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一九八七年常德石煤开采量已达70万吨,主要用在如下方面。一、石煤烧水泥。烧制水泥时,石煤既作燃料,又作原料,既节约了优质煤又代替粘土。其锻烧温度较以粘土配料时稍低,熟料中游离氧化钙也较低,易安定、而且熟料冷却过程中的粉化现象较少,更有利于窑内的均衡通风。立窑水泥由粘土配料改用石煤配料后,产量提高,热耗减少,成本降低。常德县水泥厂于一九七七年用石煤烧水泥试验成功,取得了较好的经济效益,现在省内重点推广,他们在2.5米塔式立窑中改用全烧石煤配料后,熟料
In 1987, Changde’s coal mining volume reached 700,000 tons, which is mainly used in the following aspects. First, stone coal burning cement. When firing cement, stone coal both as a fuel, but also as raw materials, both to save the quality of coal instead of clay. The calcining temperature is slightly lower than that of the clay preparation, the free calcium oxide in the clinker is also lower, and is easy to be stabilized. Moreover, the clinkering phenomenon in the clinker cooling process is less, which is more conducive to the balanced ventilation in the kiln. Shaft kiln cement from clay ingredients to stone coal ingredients, the increase in production, reduce heat consumption, reduce costs. Changde Cement Plant in 1976 with stone coal burning cement test success and achieved good economic benefits, and now focus on the promotion of the province, they are in the 2.5-meter tower shaft kiln switch to all-burned stone coal ingredients, Clinker