复合氨基酸微量元素螯合肥制备工艺研究

Manufacturing technology of chelation of amino acids with microelements

以废弃鸡毛水解液为复合氢基酸来源，研究其与微量元素铁、锌、锰、铜螫合的最佳工艺条件，并利用有机溶剂沉淀分离法制备固体复合氨基酸亚铁、锌、锰、铜螯合物，以螯合率为指标考察影响制备工艺的主要因素。结果表明，最佳工艺参数为：复合氨基酸与亚铁、锌、锰和铜螯合反应的最佳配位体摩尔比均为2：1；最佳pH值范围分别为5．0、8．0、4．0～5．0和6．0～7．0；反应温度为室温（22～26℃）；反应时间为30min。在上述条件下，复合氨基酸与各微量元素的螯合率均超过95％；所得复合氨基酸螯合物可与0．2mol／L磷酸二氢钾复配，克服了传统微肥完全不能与磷酸盐复配的缺陷。

Manufacturing technology of complex amino acids fertilizer chelated with microelements, such as iron （Ⅱ）, zinc, manganese, and copper was studied in this paper. Amino acids were hydrolyzed from waste chicken feather. Highly pure solid chelates of amino acids with iron （Ⅱ）, zinc, manganese, copper were separated using precipitation fractionation by adding organic solvent. The optimum manufacture conditions for chelates synthesis were evaluated based on the chelation rate, The optimal molar ratio of ligand of the amino acids to the four microelements was 2：1 and pH for the chelation with iron （Ⅱ）, zinc, manganese and copper were 5.0, 8.0, 4.0-5.0, and 6.0-7.0, respectively. Chelation could take place at room temperature （22-26℃） for 30 min. All the chelation rates of amino acid with the four microelements were more than 95 %, under above conditions. The results also showed that these four chelated salts could be blended with 0,2 mol/L potassium dihydrogen phosphate （KH2PO4） （quality concentration 2.72 % ）, therefore, it partly solves the problem that traditional microelements fertilizer could not re - blend with phosphate.