Ammonium perchlorate is one of the most important and applicable oxidizers used in solid propellants. Also, the morphology of ammonium perchlorate particles is an effective parameter in the production of propellants. In the current research, the preparation of ammonium perchlorate using the cooling crystallization method was studied. Four parameters including the rate of cooling, mixing patterns, agitator speed, and surfactant were considered in cooling crystallization of ammonium perchlorate. Nine tests were carried out based on the Taguchi experimental design method. The morphology of the obtained crystals was analyzed by optical microscope and MIP 4 student software. The size distribution of the particles was modeled using the Rosin-Rammler method. Obtained results illustrated that the surfactant had the most effect with the value of 70.7 % and the agitator speed, flow pattern, and cooling rate had fewer effects on the morphology with the values of 25.8 %, 2.9 %, and 0.2 %, respectively. The optimal amount of sphericity obtained by the Taguchi method was 0.77 which was verified by the experimental result of 0.76. The roundness and aspect ratio values for the optimal crystal were 0.79 and 1.40 respectively. Applying the Rosin-Rammler model showed that the homogeneity factor of size distribution was 2.22 for the optimal crystals.

中文翻译：

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冷却结晶法制备高氯酸铵颗粒的有效参数研究

高氯酸铵是固体推进剂中最重要和最适用的氧化剂之一。此外，高氯酸铵颗粒的形态是推进剂生产中的一个有效参数。在目前的研究中，对冷却结晶法制备高氯酸铵进行了研究。在高氯酸铵的冷却结晶过程中考虑了四个参数，包括冷却速率、混合模式、搅拌器速度和表面活性剂。基于田口实验设计方法进行了九项测试。通过光学显微镜和MIP 4学生软件分析所得晶体的形态。使用 Rosin-Rammler 方法模拟颗粒的尺寸分布。得到的结果表明表面活性剂的效果最好，值为 70。7% 和搅拌器速度、流动模式和冷却速率对形态的影响较小，分别为 25.8%、2.9% 和 0.2%。田口法得到的最佳球度值为0.77，实验结果为0.76。最佳晶体的圆度和纵横比值分别为 0.79 和 1.40。应用 Rosin-Rammler 模型表明，对于最佳晶体，尺寸分布的均匀性因子为 2.22。分别为 40。应用 Rosin-Rammler 模型表明，最佳晶体的尺寸分布均匀性因子为 2.22。分别为 40。应用 Rosin-Rammler 模型表明，对于最佳晶体，尺寸分布的均匀性因子为 2.22。