The large‐scale accumulation of industrial by‐product gypsum has led to land embezzlement and serious environmental pollution. Meanwhile, as a predominantly used nitrogen fertilizer, urea shows a disadvantage of high solubility in soil. Therefore, it can hydrolyze into large amounts of ammonium salts so rapidly that cannot be absorbed efficiently by crops. The sustainable method of using industrial by‐product gypsum to synthesize urea gypsum cocrystals is a promising way to solve above challenges. The synthesized urea gypsum shows low aqueous solubility and hygroscopicity, which can be used as sustained release fertilizer. In this review, the present status regarding urea gypsum is systematically reviewed, including its development history, preparation methods, impact of different raw materials, evaluation of products performance, and large‐scale trials. This review aims to reveal the current situation, identify current gaps, and provide suggestions for future investigations concerning urea gypsum.

中文翻译：

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利用工业副产石膏制备尿素石膏共晶作为缓释肥料：综述

工业副产石膏的大量积累，导致土地侵占和严重的环境污染。同时，作为主要使用的氮肥，尿素表现出在土壤中溶解度高的缺点。因此，它能迅速水解成大量铵盐，无法被作物有效吸收。利用工业副产石膏合成尿素石膏共晶的可持续方法是解决上述挑战的一种有前景的方法。合成的尿素石膏具有低水溶性和吸湿性，可用作缓释肥料。本文系统综述了尿素石膏的研究现状，包括尿素石膏的发展历史、制备方法、不同原料的影响、产品性能评价以及大规模试验等。本综述旨在揭示尿素石膏的现状，找出当前的差距，并为未来的研究提供建议。