申请人:Davy McKee Corporation
公开号:US04402923A1
公开(公告)日:1983-09-06
A phosphate rock slurry, which may be used in the production of wet process phosphoric acid, is provided by wet grinding the rock with partially neutralized, acid water. In one aspect, wet process phosphoric acid is made by advantageously recycling mineral acid waste water effluent of the process. All or a portion of the effluent can be at least partially neutralized with neutralizing agent, e.g., by contact with the base-forming constituents of phosphate rock or extraneous neutralizing agent, e.g., preferably ammonia, to provide a mixture which is wet ground to produce a processable slurry. In one particularly preferred aspect, all of the acid water is at least partially neutralized with phosphate rock and a portion of this acid water is advantageously further neutralized with an extraneous neutralizing agent. The slurry is provided by such neutralization at a pH compatible with the milling, e.g., grinding, media utilized. The use of acid water permits the use of mixtures having high solids content in the mill and thus also reduces the amount of water required to wet grind the mixture. The wet ground processable phosphate rock slurry is advantageously used in the production of phosphoric acid and recycle mineral acid waste water effluent from the process is used in wet grinding phosphate rock and as part of the overall water balance control of the process.
通过使用部分中和的酸性水与磷酸盐岩湿磨,可以提供可用于湿法磷酸生产的磷酸盐岩浆。在一个方面,通过有利地回收过程中的矿酸废水流来制造湿法磷酸。废水流的全部或一部分可以至少部分中和中和剂,例如,通过与磷酸盐岩的碱性成分或外部中和剂(例如优选的氨)接触,以提供可湿磨的混合物。在一个特别优选的方面,所有的酸性水都至少部分中和了磷酸盐岩,并且这些酸性水的一部分有利地进一步被外部中和剂中和。通过这样的中和,可以在与磨削介质相容的pH下提供浆料。使用酸性水允许在磨机中使用具有高固体含量的混合物,从而也减少了湿磨混合物所需的水量。湿磨可加工的磷酸盐岩浆有利地用于生产磷酸,并且过程中回收的矿酸废水流用于湿磨磷酸盐岩和作为过程的总水平衡控制的一部分。