A simple method for preparing chelated calcium from black liquor produced in the paper industry was studied. Various factors influencing the chelation rate of Ca²⁺ were studied, including the system pH, reaction temperature, reaction time, reaction solution ratio. The optimum reaction conditions are as follows: the system pH, reaction temperature, reaction solution ratio (V(CaCl₂):m (Black liquor)) and time were 5.6, 25°C, 1:20 and 60 min, respectively. The maximum Ca²⁺ chelation rate was 88.75%. The characteristics of chelated calcium fertilizer in black liquor were studied by Fourier transform infrared, scanning electron microscope . The results indicated that the CaCl₂ could be chelated by the black liquor from paper-making industry, and showed a high chelating rate.

研究了一种由造纸工业生产的黑液制备螯合钙的简单方法。研究了影响Ca ²⁺螯合速率的各种因素，包括体系的pH值，反应温度，反应时间，反应溶液比例。最佳反应条件如下：系统pH，反应温度，反应溶液比例（V（CaCl ₂）：m（黑液））和时间分别为5.6、25°C，1：20和60 min。Ca ²⁺的最大螯合率为88.75％。利用傅里叶变换红外，扫描电子显微镜研究了黑液中螯合钙肥的特性。结果表明，CaCl ₂ 可以被造纸工业的黑液螯合，并显示出很高的螯合率。