论文部分内容阅读
利用腐植酸的特性与尿素结合的研究和开发利用,国外早在50年代后期就有文献报导。如日本于1963年报道将100份尿素和25份腐植酸在130℃条件下加热融化,制成腐植酸尿素,再与30％的甲醛水溶液处理后,制成非吸湿性的腐植酸尿素肥料。另有日本报道,晶体尿素和经硝酸处理褐煤后获得的腐植酸,在常温下溶解于装有液氨的加压容器内,经溶液喷雾后制得粉状的腐植酸尿素肥料。又如日本报道,在室温下,腐植酸丙酮溶液与尿素溶液在容器内混合,经真空蒸发而获得粉状腐植酸尿
The use of humic acid and urea combination of the characteristics of research and development and utilization abroad as early as the late 1950s have been reported in the literature. For example, Japan reported in 1963 that 100 parts of urea and 25 parts of humic acid were heated and melted at 130 ° C to prepare humic acid urea, which was then treated with 30% formalin for non-hygroscopic humic acid urea fertilizer. Another Japanese report, crystalline urea and humic acid obtained after nitric acid treatment of lignite, dissolved in liquid ammonia pressurized container at room temperature, the solution was sprayed to obtain a powder humic acid urea fertilizer. Another example is reported in Japan, at room temperature, humic acid solution of acetone and urea solution in the container were mixed and evaporated to obtain powdered humic acid urine