The sintering reactions in K₂O–MgO–Al₂O₃–SiO₂ system using K-feldspar, magnesite, and potassium carbonate as the starting materials were studied to prepare potassium magnesium silicates and potassium aluminosilicates as multiphase slow-release fertilizers (SRFs). Effects of sintering temperature (850–1250 °C), time (1–5 h), and addition of K₂CO₃ (100 %–130%) on the reaction extents as well as the types of final products were investigated. Results showed that the multi-phases of K_1.14Mg_0.57Si_1.43O₄ and KAlSiO₄ were prepared as stable products under the concerned conditions of 1050 °C for 2h, and K₂MgSiO₄ was obtained instead of K_1.14Mg_0.57Si_1.43O₄ under the situation of adding excessive K₂CO₃. Sintering experiments of five raw mixtures were designed to discuss reaction mechanism by comparing the Al-phases in final products. The results indicated that Al₂O₃ component favored to persist as potassium aluminosilicates (KAlSiO₄ or KAlSi₂O₆), and three multiphase compounds, KAlSiO₄ + K_1.14Mg_0.57Si_1.43O₄, KAlSiO₄ + K₂MgSi₃O₈, and KAlSi₂O₆ + K₂MgSi₃O₈ were successfully prepared at optimal conditions and subsequently characterized. Solubility tests of sintered samples in water, 20 g/L critic acid solution, and 0.5 mol/L hydrochloric acid solution showed that the three samples exhibited increasing solubility orderly with consistent component soluble sequence of MgO > K₂O ≥ Al₂O₃ > SiO₂ in different solutions. K_1.14Mg_0.57Si_1.43O₄ is found to perform the best soluble behavior, while KAlSi₂O₆ shows a less soluble behavior. Present work proposed considerable approaches to make the inert elements in minerals (K-feldspar and magnesite) and the active element (K) in potassium carbonate accessible for plants in a slow-release route.

以钾长石、菱镁矿和碳酸钾为原料，研究了_{K 2} O–MgO–Al ₂ O ₃ –SiO ₂体系中的烧结反应，制备了硅酸镁钾和铝硅酸钾作为多相缓释肥料（SRFs） 。 ）。研究了烧结温度（850–1250 °C）、时间（1–5 h）和K ₂ CO ₃添加量（100%–130%）对反应程度和最终产物类型的影响。结果表明，K _1.14 Mg _0.57 Si _1.43 O ₄和 KAlSiO 的多相在1050℃反应2h的相关条件下制备出稳定的产物₄，在加入过量K ₂ CO _{3的情况下得到K 2} MgSiO ₄代替K _1.14 Mg _0.57 Si _1.43 O ₄。设计了五种原料混合物的烧结实验，通过比较最终产品中的铝相来讨论反应机理。结果表明，Al ₂ O ₃组分有利于以铝硅酸钾（KAlSiO ₄或 KAlSi ₂ O ₆）和三种多相化合物 KAlSiO _{4的形式存在。} + K _1.14 Mg _0.57 Si _1.43 O ₄、KAlSiO ₄  + K ₂ MgSi ₃ O ₈和KAlSi ₂ O ₆  + K ₂ MgSi ₃ O ₈在最佳条件下成功制备并随后进行了表征。烧结样品在水中、20 g/L 临界酸溶液和 0​​.5 mol/L 盐酸溶液中的溶解度测试表明，三种样品的溶解度依次递增，组分溶解顺序一致，MgO > K ₂ O ≥ Al ₂ O ₃  >二氧化硅_{_}在不同的解决方案中。发现K _1.14 Mg _0.57 Si _1.43 O ₄表现出最好的可溶性，而KAlSi ₂ O ₆表现出较不溶性。目前的工作提出了相当多的方法，使矿物（钾长石和菱镁矿）中的惰性元素和碳酸钾中的活性元素 (K) 可通过缓释途径被植物吸收。