Method for preparing fertilizer

Abstract

The invention provides a method for preparing a fertilizer, and belongs to the technical field of fertilizers. The method comprises the following steps: (1) preparing an emulsion: dissolving a surfactant Span-60 in melted paraffin, performing intense stirring at a constant temperature of 80 DEG C until uniformity to obtain a phase A, adding a surfactant Tween-80 to an aqueous solution containinga release factor, performing stirring at a constant temperature until uniformity to obtain a phase B, adding the phase A to the phase B under an intense stirring condition, adding several drops of a tributyl phosphate antifoaming agent, and continuously performing intense stirring for 2 h to obtain the emulsion; (2) coating a Sifang compound fertilizer with the emulsion prepared in step (1) to obtain a coated fertilizer b; and (3) testing the anti-hardening and slow-release properties of the coated fertilizer b, and comparing the coated fertilizer B with an uncoated composite fertilizer a. Thefertilizer prepared in the invention has the anti-hardening and slow-release properties.

Description

technical field [0001] The invention belongs to the field of fertilizer preparation, in particular to a method for preparing fertilizer. Background technique [0002] Research on slow-release fertilizers abroad was earlier. Japan’s Ikawa Fertilizer Co., Ltd. made phosphoric acid react with inorganic powder containing Mg and 5102 on the surface of compound fertilizer particles, and the particles were coated by the product, and then treated with ammonia to obtain particle wrapping. Compound fertilizers can be used as slow-release fertilizers; Japan's Central Glass Company has developed a mixture of paraffin and rosin to coat N-P-K (14-14-14) mixed fertilizer particles (4-smm); Romania uses cyclohexanone and PVC emulsion in asphalt (using CHZ1C2 as solvent) is coated with phosphoric acid diphosphate fertilizer; Japanese Onoda Chemical Industry has developed a fertilizer with both iron and phosphorus as the main ingredient; "Ultra-long-acting nitrogen-phosphorus compound fertil...

AI Technical Summary

Problems solved by technology

The main reasons for the slow progress of domestic development work are: (1) Anti-caking slow-release fertilizers should not only solve the problem of quick-acting fertilizers to release nutrients quickly, but also respect the law of nutrient demand in the process of crop growth. During the process, try not to be affected by external conditions (temperature, humidity, pressure, etc.), and maintain its original characteristics; therefore, the research work involves physics, chemical engineering, agronomy and other disciplines, and traditional research work lacks this combination; (2) due to the lack of The rapid determination method of fertilizer nutrient release performance, the research process and results cannot be evaluated in a timely and effective manner; (3) the relevant domestic departments and fertilizer companies have insufficient understanding of anti-caking slow-release coated fertilizers, and have not really paid attention to its development and development. research work

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