Industrial production method and device of urea-formaldehyde slow-release compound fertilizer
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A urea-formaldehyde slow-release and compound fertilizer technology, which is applied in fertilization devices, fertilizer mixtures, agriculture, etc., can solve the problems of lack of combination and optimization of urea-formaldehyde fertilizer systems, achieve good nitrogen slow-release performance, improve fertilizer utilization, and enhance resistance reverse effect
Active Publication Date: 2013-04-03
河南豫邮金大地科技服务有限公司
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However, most of the above-mentioned Chinese patent documents describe the chemical synthesis method of urea-formaldehyde fertilizers and the physical blending with conventional fertilizers, etc., lacking the systematic combination and optimization of urea-formaldehyde fertilizers and conventional fertilizers in terms of production process equipment
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Embodiment 1
[0032] Embodiment 1: An industrialized production device of urea-formaldehyde slow-release compound fertilizer, the production device includes a raw material mixer 1, a raw material belt conveyor 2, a raw material crusher 3, a raw material bucket elevator 4, a granulator 5, and a formaldehyde storage tank 6 , formaldehyde pump 7, urea bucket elevator 8, formaldehyde metering tank 9, acid metering tank 10, stirring reactor 11, metering pump 12, drying belt conveyor 13, blower 14, hot blast stove 15, dryer 16, cooling belt Machine 17, cooling machine 18, screening bucket elevator 19, screening machine 20, screening belt conveyor 21, powder dusting cylinder 22, finished bucket elevator 23, finished product silo 24, packaging scale 25; raw material mixer 1 discharge The mouth is set opposite to the feed end of the raw material belt conveyor 2, the discharge end of the raw material belt conveyor 2 is set opposite to the feed port of the crusher 3, and the discharge port of the raw m...
Embodiment 2
[0045] Example 2: An industrial production method of a urea-formaldehyde slow-release compound fertilizer. The steps are the same as in Example 1, except that in step (1), 20 wt% potassium hydroxide aqueous solution is used to adjust the pH value to 8.5-8.8.
Embodiment 3
[0046] Example 3: An industrial production method of a urea-formaldehyde slow-release compound fertilizer. The steps are the same as those in Example 1, except that in step (2), 20% phosphoric acid is used to adjust the pH value to 5.4-5.1.
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Abstract
The invention relates to an industrial production method and device of a urea-formaldehyde slow-release compound fertilizer and a device thereof. The industrial production method comprises the steps of adding water and oxidized starch to a reaction still and then pasting, adding urea of which the nitrogen content is 46wt% and formalin, stirring, dissolving and then adjusting the pH value to 8.5-8.8 by an alkaline matter, reacting at constant temperature of 60 DEG C to obtain reaction liquid; adjusting the pH value to 5.4-5.1 by the reaction liquid; reacting for 45 minutes at the constant temperature of 65-68 DEG C, then adjusting the pH value to 6.8-7.2, and terminating reaction to obtain the urea formaldehyde condensation product solution; mixing the urea formaldehyde condensation product solution with nitrogen, phosphorus and potassium materials, pelletizing, drying and cooling to below 35 DEG C, and screening to obtain the urea-formaldehyde slow-release compound fertilizer. The industrial production device of the urea-formaldehyde slow-release compound fertilizer is also provided by the invention. Urea formaldehyde is taken as a skeleton; rapid disintegration phenomenon of fertilizer particles caused by water absorption expansion is effectively prevented; the urea-formaldehyde slow-release compound fertilizer has good nutrient slow-release performance, and is high in pelletizing rate in the production process and strong in granule hardness, and the total nutrient content is improved.
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