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ＣａＳＯ４－Ｈ３ＰＯ４－Ｈ２ＳＯ４－Ｈ２Ｏ四元系统是湿法磷酸领域中的主要相图，直到１９５８年才由日本学者池野亮当等人＊首先发表，而且只是其中关于ＣａＳＯ４·１２Ｈ２ＯＣａＳＯ４·２Ｈ２Ｏ转化过程部分的研究结果。７０年代中，笔者在研究半水—二水再结晶流程时发现：在温度恒定的条件下，四元系统中的ＣａＳＯ４·１２Ｈ２ＯＣａＳＯ４·２Ｈ２Ｏ转化过程的平衡点轨迹呈线性，可以用直线方程式计算有关参数，扩大了它的意义。随后，笔者在进行半水—二水再结晶流程的中试时，曾用上述计算参数控制ＣａＳＯ４·１２Ｈ２Ｏ—→ＣａＳＯ４·２Ｈ２Ｏ转化过程中二水物结晶的形成，取得满意结果。
The CaSO4-H3PO4-H2SO4-H2O quaternary system was the main phase diagram in the field of wet-process phosphoric acid, which was not published until 1958 by the Japanese scholar Yoshihiro Ike *, et al., But only about the conversion process of CaSO4 · 12H2OCaSO4 · 2H2O Part of the research results. In the 1970s, when studying the process of semi-water-water recrystallization, we found that the equilibrium point trajectory of CaSO4 · 12H2OCaSO4 · 2H2O in the quaternary system is linear under the condition of constant temperature, which can be expressed by the straight line equation Compute the parameters and expand its meaning. Subsequently, the author in the semi-water - water recrystallization pilot process, the above parameters have been used to control CaSO4 · 12H2O- → CaSO4 · 2H2O conversion process of dihydrate crystal formation, and achieved satisfactory results.