Urea sulfate-coated urea slow-release granular fertilizer and preparation method thereof
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A technology of slow-release granular fertilizer and coated urea, which is applied in urea compound fertilizer, nitrogen fertilizer, fertilization device and other directions, can solve the problems of low nitrogen content, thick sulfur coating layer, and difficult to degrade.
Active Publication Date: 2018-01-16
JILIN YUNTIANHUA AGRI DEV CO LTD
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[0008] The purpose of the present invention is to provide a urea sulfate-coated urea slow-release granular fertilizer to solve the problems of thick sulfur-coated film, low nitrogen content, cracks in the film, expensive resin film and difficult to degrade.
Method used
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[0027] Urea sulfate-coated urea slow-release granular fertilizer, from inside to outside, respectively, urea particles with a diameter of 2-4.5mm, urea sulfate silicate slow-release film, and sealing film;
[0028] The described urea sulfate silicate slow-release film is a film made of urea sulfate as binder and silicate powder as aggregate;
[0029] The silicate powder is silicate clinker with a particle size of 200-300 mesh;
[0030] The sealing film is paraffin, and the paraffin is a mixture of liquid wax and solid wax, and their percentages by weight are 20-70% and 80-30% respectively.
Embodiment 2
[0031] Embodiment two The preparation of binding slow-release agent urea sulfate
[0032] 1. Slowly add 1kg of 98wt% concentrated sulfuric acid to 10kg of urea, and react in the reaction tank to obtain a viscous urea sulfate solution for later use.
[0033] 2. Slowly add 1kg of 90wt% concentrated sulfuric acid to 1kg of urea, and react in the reaction tank to obtain a viscous urea sulfate solution for later use.
[0034] 3. Slowly add 2kg of 98wt% concentrated sulfuric acid to 1kg of urea, and react in a reaction tank to obtain a viscous urea sulfuric acid solution for later use.
[0035] 4. Slowly add 1kg of 95wt% concentrated sulfuric acid to 5kg of urea, and react in a reaction tank to obtain a viscous urea sulfate solution for later use.
Embodiment 3
[0036] Example 3 Preparation of mounting medium
[0037] The liquid wax and solid wax are heated to 50-60°C and mixed, and their weight percentages are 20-70% and 80-30% respectively.
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Abstract
The invention discloses a urea sulfate coated urea slow-release granular fertilizer. The urea sulfate coated urea slow-release granular fertilizer is prepared through the following steps of: adding 100kg of urea granules of which the diameters are 2-4.5mm to a rotary drum type coating machine, preheating the urea granules to 40-45 DEG C, spraying 1-10kg of a binder namely urea sulfate, uniformly mixing the preheated urea granules and the urea sulfate so as to obtain a mixture, spraying 1-20kg of metasilicate powder, cooling the mixture and the metasilicate powder, spraying 1-10kg of mounting addition agents (a mixture of solid paraffin and liquid paraffin) of which the temperature is 50-60 DEG C, cooling the mixture, the metasilicate powder and the mounting addition agents to a room temperature, and repeating the coating operation 2-3 times. The binder namely the urea sulfate is prepared through the steps of slowly adding1-2kg of concentrated sulfuric acid of 90-98wt% to every 1-10kg of urea and performing a reaction in a reaction tank. The urea sulfate coated urea slow-release granular fertilizer disclosed by the invention adopts a urea sulfate metasilicate slow-release film, tests prove that the urea sulfate metasilicate slow release film has a favorable slow-release effect, and in the slow-release process, the slow-release film is not liable to collapse and is easy to degrade. The urea sulfate has subacidity, so that the application range of the urea sulfate is wider than that of sulfur coating urea. The urea sulfate coating film realizes double-film double-control effects, and has the advantages of high efficiency, environmental protection, low cost and the like.
Description
technical field [0001] The invention belongs to agricultural production materials, and in particular relates to a preparation method of urea sulfate-coated urea slow-release granular fertilizer. Background technique [0002] The application of chemical fertilizers has continuously increased global food production, and it is the fastest and most important measure to increase food production in both developed and developing countries, providing food security for the world's population. However, the utilization rate of chemical fertilizers in my country is not high, and the utilization rate of nitrogen fertilizer in the current season is only 35%. According to data from the Food and Agriculture Organization of the United Nations, from 1980 to 2002, China's chemical fertilizer consumption increased by 61%, while grain output only increased by 31%. Due to the low fertilizer utilization rate and the decline of fertilizer efficiency year by year, the amount of fertilizer applied h...
Claims
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Application Information
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