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    • 8. 发明申请
    • AUTOMATIC CONTROL SYSTEM FOR A CHEMICAL PROCESS, ESPECIALLY A WET PROCESS PHOSPHORIC ACID PLANT
    • 化学工艺自动控制系统,特别是湿法工艺磷酸厂
    • WO1994024046A1
    • 1994-10-27
    • PCT/US1994004057
    • 1994-04-20
    • IMC FERTILIZER, INC.
    • IMC FERTILIZER, INC.HILAKOS, Stephen, W.
    • C01B25/16
    • C01B25/223B01D33/327
    • Constant efficiency operation of a wet process phosphoric acid plant can be obtained by controlling the specific gravity of the filtrate (5C1) from the last washing of the gypsum cake. The filtrate from the last washing of the gypsum cake also is called the first pass filtrate (5C1). The specific gravity of this first pass filtrate (5C1) provides an indication of the overall filter efficiency and the loss of water-soluble phosphoric acid to the gypsum waste stream. The specific gravity of the first pass filtrate (5C1) is controlled by adjusting the rate at which product slurry (6) from the attack tank (20) is fed to the filter (30). This product slurry feed rate is affected by the mechanical performance of the filter (30) and the filterability of the gypsum crystals, which, in turn , is affected by operating conditions in the attack tank (20).
    • 通过从上次的石膏饼的洗涤中控制滤液(5C1)的比重可以获得湿法磷酸装置的恒定效率的操作。 最后一次洗涤石膏饼的滤液也称为第一道滤液(5C1)。 该第一道滤液(5C1)的比重提供了总体过滤效率和水溶性磷酸对石膏废料流的损失的指示。 第一通滤液(5C1)的比重通过调节来自冲击罐(20)的产物浆料(6)进料到过滤器(30)的速度来控制。 该产品浆料进料速率受过滤器(30)的机械性能和石膏晶体的过滤性影响,而这又受到攻击罐(20)中的操作条件的影响。