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pcc生产中干燥虽然属于物理过程,机理简单,只是将湿碳酸钙滤饼中水分加热蒸发,---水分含量达标。但该过程是生产中消耗热能大的工序,它比石灰石锻烧耗煤高2~3,还存在干燥温度控制不好易造成返碱,密闭不严易造成产品污染等问题,直接影响后产品的优劣、成本高低,故对干燥设备的选择应该满足一定的要求:---产品工艺要求,干燥均匀;适应物料的状态,如块状、浆状或粉状、粒状等;干燥速率高,达到所需的生产能力;能耗低,热效高,而且稳定;对环境污染小,劳动环境好;投资省,操作安全---;适应物料的热劣化,即考虑物料的热敏性,它是确定待干燥物料的温度上限,是选择干燥设备和热源的重要条件。
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