Abstract:The desulfurization process of flue gas desulfurization of a coal-fired power plant is made of limestone-gypsum wet process, according to the determination of lime calcium oxide content, a batch of limestone calcium oxide content exceeds the standard, which the content of calcium oxide is as high as 60%, the amount of calcium carbonate is more than 100%, It''s obviously not common sense. Through a series of chemical analysis experiments, it is verified that the test method, reagent, test process and content of iron and aluminum impurities are not the cause of excessive calcium oxide content. Finally, the test principle is further analyzed and tested, the main reason is that the limestone is mixed with quicklime or lime, artificial addition of calcium is similar to the addition of melamine in milk, it interferes with the determination of calcium oxide in limestone. The aqueous solution of the sample is qualitatively tested whether it contains calcium ions, a quick and effective test of whether the limestone is mixed with quicklime or lime, the quality acceptance of limestone and the safe operation of desulfurization system are guaranteed, to a large extent, it makes up for the deficiency of the determination of the content of calcium oxide and magnesia in limestone.