Controlled release mixed and compound fertilizer and preparation method thereof

A technology of slow-release compound fertilizer and compound fertilizer, applied in fertilization equipment, fertilizer mixture, application, etc., can solve the problems of high price of coating auxiliary agent, high production cost of slow-release fertilizer, low utilization efficiency of by-products, etc. Achieve the effect of improving sustainability, benefiting growth and reducing production costs

Inactive Publication Date: 2014-01-08
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

[0004] Most of the industrial by-products of wet-process phosphoric acid contain a certain proportion of phosphorus, and a small amount of them are directly applied to the soil as fertilizer in the industry, which has a certain fertilizer effect, but the utilization efficiency of these by-products is very low in this treatment method
Some people have also studied the use of individual types of by-products as slow-release fertilizer coating materials for the production of slow-release fertilizers. Hao Shixiong et al. used fertilizer grade calcium hydrogen phosphate as the coating material and polyvinyl alcohol as a coating auxiliary agent to develop a A slow-release compound fertilizer (document: "Development and release characteristics of calcium hydrogen phosphate-coated urea", Hao Shixiong, Journal of Plant Nutrition and Fertilizer, 2006, 12 (3): 426-430), which discloses fertilizer grade A new method for the utilization of calcium hydrogen phosphate, but the coating auxiliary agent used in this method is expensive, the production process is complicated, and the resulting slow-release fertilizer has a higher production cost

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  • Controlled release mixed and compound fertilizer and preparation method thereof

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[0026] The preparation method of the slow-release compound fertilizer of the present invention comprises the following steps: weighing 0.1-30% of the by-products of the wet-process phosphoric acid industry and 0.1-20% of the coating auxiliary, which account for 0.1-30% of the total weight of the slow-release compound fertilizer, and mixing them evenly Then, 2-12% water is added to coat the compound fertilizer granules, and after drying, the finished product of slow-release compound fertilizer granules is obtained.

[0027] Further, the compound fertilizer granules can be prepared by the following method: nitrogen, phosphate, potassium fertilizers with a weight ratio of nitrogen, phosphorus and potassium to 4-25:4-25:4-25 and The granulation adjuvant, which accounts for 0.1-29% of the total weight of the compound fertilizer, is mixed evenly, among which nitrogen, phosphorus and potassium are three nutrients (N+P 2 O 5 +K 2 The total mass fraction of O) is 25-60%, adding 0.5-1...

Embodiment 1

[0032] (1) Nucleation

[0033] Put ammonium sulfate, heavy calcium and potassium sulfate in the 4:15:10 ratio of nitrogen, phosphorus and potassium into the granulator, and add the granulation auxiliary chalk soil that accounts for 22% of the total compound fertilizer. , mix evenly, add 10% water, granulate, dry and sieve to obtain compound fertilizer granules with a particle size of 3-5mm for use.

[0034] (2) Shell making

[0035] Put the above-mentioned standby compound fertilizer granules into the coating machine, add fertilizer grade calcium hydrogen phosphate with a water content of 48%, and 5% molasses, which account for 15% of the total portion of the slow-release fertilizer, and add a coating material that accounts for the total amount of the coating material and moisture. 2% water. The compound fertilizer granules are coated and then dried to obtain the finished product of slow-release compound fertilizer granules.

Embodiment 2

[0037] (1) Nucleation

[0038] Put ammonium chloride, monoammonium phosphate and potassium sulfate in the 15:4:10 nutrient ratio of nitrogen, phosphorus and potassium into the granulator, and add granulation auxiliary which accounts for 20% of the total compound fertilizer. The chalk soil was added with 12% water, granulated, dried and sieved to obtain compound fertilizer granules with a particle size of 3-5 mm for later use.

[0039] (2) Shell making

[0040] Put the above-mentioned standby compound fertilizer granules into the coating machine, add ammonium phosphate residue accounting for 13% of the total part of slow-release fertilizer, 7% coal slime, and add water accounting for 9% of the total part of coating material and moisture. . The compound fertilizer granules are coated and then dried to obtain the finished product of slow-release compound fertilizer granules.

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Abstract

The invention relates to controlled release mixed and compound fertilizer and a preparation method thereof, belongs to the field of fertilizers and solves the technical problem of providing the controlled release mixed and compound fertilizer. The controlled release mixed and compound fertilizer comprises a core layer and a coating layer covering the surface of the core layer. The core layer is made of mixed and compound fertilizer particles. The coating layer is a byproduct of wet-process phosphoric acid industry and a coating aid accounting for 0.1-20% of the controlled release mixed and compound fertilizer. The coating aid is made from at least one of humic acid, bee honey, starch, clay, chalk soil, kaolin, coal slime, magnesia, sepiolite powder, phosphogypsum, and calcium magnesium phosphate. A new way of using a large amount of the byproduct of wet-process phosphoric acid industry is provided; the byproduct of wet-process phosphoric acid industry is used as main material of the coating layer, the low-cost coating aid is utilized, and accordingly production cost of the controlled release fertilizer is reduced greatly; the preparation process of the controlled release fertilizer is simple and can be performed under normal temperature and normal pressure, raw materials applied are simply and easily obtainable and safe and nontoxic, and operation is simple.

Description

technical field [0001] The invention relates to a slow-release compound fertilizer and a preparation method thereof, belonging to the field of fertilizers. Background technique [0002] Phosphorus chemical industry is an industry in which various phosphorus-containing products are obtained through physical and chemical processing of phosphate ore as raw materials. Phosphoric acid, as an intermediate product in this industry, is mainly produced by two technologies, wet-process phosphoric acid and thermal-process phosphoric acid. In recent years, with the changes in market demand and the constraints of resources, environment, energy and other factors, the production technology of phosphoric acid and inorganic phosphate based on wet phosphoric acid technology has gradually replaced the traditional thermal phosphoric acid and phosphate production technology. However, in the process of industrial production of wet-process phosphoric acid, various industrial by-products containin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
Inventor 杨林熊星张志业王辛龙杨秀山孔行健钟本和
Owner SICHUAN UNIV
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