Potassium fulvate type compound fertilizer containing medium and trace metal elements and preparation process of potassium fulvate type compound fertilizer

Abstract

The potassium fulvic acid type compound fertilizer containing the medium trace metal elements comprises the following raw materials in parts by weight: 95-99.9 parts of urea-containing type compound fertilizer particles and 0.1-5 parts of medium trace element powder, the content of amide nitrogen in the urea-containing compound fertilizer particles is greater than or equal to 15%; the medium trace element powder is in a sulfuric acid state, a nitric acid state and an oxidation state; the trace elements are two or more of calcium, magnesium, zinc, manganese, boron, iron, copper and molybdenum. The preparation process comprises the following steps: producing the compound fertilizer according to the existing production process flow, and granulating and cooling fertilizer particles to obtain coarse particles; uniformly mixing medium trace element raw materials in proportion; the coarse particles are placed in a coating kiln, 98% concentrated sulfuric acid is sprayed into the coating kiln in an atomized mode from a feeding port of the coating kiln, the spraying amount is 0.1% of the weight of the coarse particles, medium trace element powder is sprayed to the surfaces of the fertilizer particles from the interior to the tail of the coating kiln, and finished product particles are obtained. The finished particles are good in flowability, free of caking, simple in process and low in cost.

Description

technical field [0001] The invention relates to a potassium fulvic acid compound fertilizer containing medium and trace metal elements and a preparation process thereof. Background technique [0002] China is a big agricultural country, and it is also the world's largest producer and consumer of chemical fertilizers. For a long time, due to the irrational structure of chemical fertilizers, the single structure of chemical fertilizers and excessive application of chemical fertilizers have not only caused serious threats to the safety of food and agricultural products, but also aggravated the degree of agricultural non-point source pollution, seriously hindering the development of green agriculture in my country. [0003] Under the current policy of weight loss and efficiency enhancement, we need to scientifically compound large, medium and micro elements according to the regional soil conditions and the characteristics of crop fertilizer requirements. The formation of enzyme...

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Problems solved by technology

[0006] The first one is to add medium and trace raw materials to the fertilizer raw materials before the formation of fertilizer particles. This method of adding will cause the reaction of medium and trace elements with acid or phosphate ions to form insoluble substances, which are not easily absorbed by crops and affect fertilizer efficiency;

[0007] The second method is to wrap the medium and trace raw material powder on the surface of the fertilizer particles through the oil-based solution. This addition method will cause the oil-based solution to dilute the nutrients. At the same time, the medium and trace element powder is easy to fall off, and the particle fluidity is poor;

[0008] The third is to add medium and trace element particles to the fertilizer raw material after the fertilizer particles are formed. This method of adding will cause uneven nutrition due to uneven particle size and uneven mixing.

[0009] None of the above methods can solve the problem of evenly adding medium and trace metal elements in compound fertilizer granules.

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