At present the international production of potassium sulfate main method for the Mannheim method, the use of salt lake brine preparation of potassium sulfate method and the use of soluble sulfate mine potassium sulfate method. Compared with Mannheim method, the use of salt lake brine to prepare potassium sulfate process equipment is simple, can build a large device, the investment is relatively low, the main drawback is the low yield of potassium, one step yield 57%, two Rate 78%, only in the potassium chloride source is sufficient and low prices under the conditions of competition, and potassium sulfate superior product rate is low, by-product emissions and pollution problems are not well resolved; and the use of soluble sulfate In the process of producing potassium sulfate, the utilization rate of potassium is less than 60% due to the fact that the double salt can not be fully decomposed in the production process. In addition, the available potassium resources in China are low, the grade is low, the distribution is regional and the process separation is difficult. Poor quality and low yield and other shortcomings, resulting in the above two methods can not be widely promoted and applied. At present, most domestic enterprises are using Mannheim method, the law provides more than 50% of potassium sulfate.
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