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沉淀硫酸钡的干燥技术具体是什么

来源:河南钡丰化工有限公司   时间:2019-04-15

  在沉淀硫酸钡的工业生产中,干燥是最后一道工序,直接关系到产品最终质量,影响产品最终水份含量、白度等技术指标。沉淀硫酸钡滤饼是属粘性膏糊状物料,滤饼含水率在26%-45%,滤饼含水率的高低取决于压滤机的压滤效果,同时也影响后序干燥系统的负荷。年产3000t/a以下的小规模化工厂采用炕房烘干,烟气加热,要求炕面温度不低于250℃;年产3000t/a-5000t/a,乃至10000t/a规模的采用烟道气间接加热回转干燥形式。有些沉淀硫酸钡生产厂家利用空心浆干燥器对硫酸钡滤饼进行干燥试验,结果表明,单级干燥机直接干燥,干燥后物料水份含量在8%-12%之间,远未达到产品含水率要求;后来将单级干燥出来的物料进行二次干燥实行两级干燥,二级干燥器干燥出来的物料水份含量为0.1%以下,可以达到产品含水率指标。随后将这种两级空心浆叶干燥形式用于工业化生产,效果良好,开辟BaSO4行业干燥的新途径,同时解决了空心浆叶干燥机干燥粘性膏糊状物料问题。

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