Quick-acting slow-released compound fertilizer and preparation method thereof

Abstract

The invention discloses a quick-acting slow-released compound fertilizer and a preparation method thereof. The preparation method comprises the following steps of: adding a raw material containing nitrate nitrogen, ammonium nitrogen and amidonitrogen to materials, directly introducing gas ammonia to a material layer of a rotor drum granulator to finish ammoniation of ammonium nitrate phosphorus, and controlling the mass of urea nitrate generated by reaction. According to effective proportioning, the contents of nitrogen in the quick-acting slow-released compound fertilizer are as follows in percentage by mass: 2-5 percent of nitrate nitrogen, 6-9 percent of ammonium nitrogen and 7-11 percent of amidonitrogen. The phosphorous and potassium nutrient content is determined according to proportioning of different products. The ammonium nitrate phosphorus, containing the nitrate nitrogen, as the raw material is added by in two parts, i.e., the ammonium nitrate phosphorus containing 1-3 percent of nitrate nitrogen is added into the material layer, and the rest of ammonium nitrate phosphorus containing 1-2 percent of nitrate nitrogen is added into a part which is 1-1.5m away from the inlet of a cooler; and the surfaces of fertilizer particles subjected to drying and fine screening are wrapped, so that the quick-acting slow-released compound fertilizer has available nitrogen shells. The slow-released nitrogen urea is added in a solid manner, used as master batch for granulation and wrapped layer by layer by other material layers of nutrients, so that the quick-acting slow-released compound fertilizer has slow-released kernels.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizers, and in particular relates to a quick-acting slow-release compound fertilizer and a preparation method thereof. Background technique [0002] At present, with the development of modern agriculture, the development of compound fertilizers at home and abroad has taken a leading role in the chemical fertilizer industry. In developed countries of the chemical fertilizer industry, the amount of compound fertilizers has accounted for 70%-80% of the amount of chemical fertilizers. However, long-term large-scale application of chemical fertilizers not only increases crop production, but also has a great negative impact on soil, crops and the environment. Studies have shown that conventional chemical fertilizers have a large amount of nutrients, concentrate and release quickly in the early stage of application, which will cause leaching, decomposition, Loss due to volatilization, and even redu...

AI Technical Summary

Problems solved by technology

At present, the domestic production of slow-release fertilizers is more common to coat the surface of fertilizer particles with an insoluble inert film to delay the dissolution and diffusion of fertilizers and achieve the purpose of slow-release, but the thickness of the film cannot be controlled, which leads to the inability of nutrients to grow according to crops Need to be released, some nutrients can't even be released

It causes the crops to defertilize in the early stage, and the growth of the seedlings is slow, which cannot guarantee the supply of nutrients throughout the entire growth period of the crops.

Moreover, the chemical coating agent used in slow-release fertilizers using chemical coating agents is generally an inert polymer compound. After the nutrients are released, the coating agent remains in the soil and is difficult to degrade, which will cause secondary pollution to the soil environment.

Moreover, the cost of using polymer inert film is high, and the price of the slow-release fertilizer produced by it is as high as 6,000-8,000 yuan / ton. Therefore, it can only be used for economic crops, and field crops are not acceptable at all.

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