Nitrogen nutrients in the compound fertilizer reach more than 20%, said high-nitrogen compound fertilizer. The nitrogen in compound fertilizer should be increased, then the amount of urea in the raw material must increase. Ammonium chloride and ammonium sulfate, which are low grade chemical fertilizers, cannot be allocated. In the production of compound fertilizer, nitrogen should be allocated to more than 20%, then the amount of urea should reach more than 35% (because there is some nitrogen in ammonium phosphate), but the current domestic production level of urea is limited to about 25%, such as urea With increasing dosage, the free water precipitated from the reaction of urea and monoammonium and the high solubility of urea have a low melting point. In the dryer, it will melt, stick to the wall, form abnormal granules, and even cause slurry so that it can not be used for normal production. Our Wuxi Xinghua Compound Fertilizer Research Institute successfully increased nitrogen to 23% in compound fertilizer production. The maximum amount of urea in the formulation reached 50%, and we can continue normal production. The index of bulb formation and yield are equal to 15 The 1:15:15 formula is similar, creating a precedent for high-nitrogen production and filling the domestic gap. Since the successful research in 1996, through the promotion in recent years, high-nitrogen production technology has been applied in dozens of large and medium-sized compound fertilizer plants throughout the country. The mature technology and superb technology have been well received by users. The successful research of high nitrogen production technology has great practical significance: In China's Xinjiang, Guangdong and other provinces only urea manufacturers, but no ammonium chloride manufacturers. With high-nitrogen production technology now available, urea can be used as a source of nitrogen for local materials and long-distance purchase of ammonium chloride can be avoided. two. Some factories that produce urea also have compound fertilizer production workshops at the same time. They can use the urea of ​​the factory for deep processing, add additional value, produce high-content compound fertilizers, and improve the grade of their own products and in the market. The competitiveness. three. In the northwestern region of China, most of them are saline-alkali soils, and it is not appropriate to apply double-chloride fertilizer composed of ammonium chloride and potassium chloride. Urea can now be used as a nitrogen source to produce neutral, weakly acidic compound fertilizers, which prevent the continued alkalization of the soil. four. Can also develop a variety of special chlorine-free cash crop special fertilizers such as: fruits, sugar cane, beets, tobacco and other special fertilizers. Fifth, high-nitrogen production technology can increase nitrogen, so that the fertilizer effect of compound fertilizer is obviously improved, and the scientific formula proposed for agrochemical services is implemented to provide a production route. six. Since 1999, from the comparison of nutrient prices, urea nitrogen has been lower than ammonium chloride nitrogen, which has reduced the cost of compound fertilizers and increased market competitiveness. The high-nitrogen formulation in compound fertilizer production is a difficult technique to master in production. Because of its low decomposition temperature and high solubility, urea is very sensitive to the technical indicators such as moisture and temperature, and must be taken seriously in operation.
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