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Special selenourea slow-release composite fertilizer for rice and production technology of fertilizer

A technology of slow-release compound fertilizer and selenourea, applied in urea compound fertilizer, application, nitrogen fertilizer, etc., to achieve strong market competitiveness, increase utilization rate, and broad market prospects

Inactive Publication Date: 2016-12-07
史丹利化肥当阳有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] my country began to conduct research and trial production of urea-formaldehyde in the 1970s, but only a few small-scale pilot plants were built.

Method used

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  • Special selenourea slow-release composite fertilizer for rice and production technology of fertilizer
  • Special selenourea slow-release composite fertilizer for rice and production technology of fertilizer
  • Special selenourea slow-release composite fertilizer for rice and production technology of fertilizer

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Embodiment 1

[0044] Urea formaldehyde 38kg, potassium chloride 25kg, monoammonium phosphate 21kg, sodium selenite pentahydrate 2.81kg, water 3.5kg, ash 9.69kg. Soy lecithin 0.5kg, polycarboxylate GY-D050.4kg, polycarboxylate GY-D070.6kg.

[0045] ①The formaldehyde solution is sent from the storage tank to the second melting tank of the urea evaporation process by pumping, and sodium selenite pentahydrate is also sent to the second melting tank through a meter at the same time, formaldehyde, urine and sodium selenite pentahydrate The diluent reacts in the second melting tank and its subsequent processes, the reaction residence time is 1 to 10 hours, the pH value of the solution is controlled at 6 to 8, and the generated selenourea formaldehyde chelate solution is directly added to the pump inlet;

[0046] ② Pour the monoammonium phosphate, potassium chloride and ash into the mixing tank and stir, mix evenly, and send it to the pulverizer 1 through the conveyor belt 1, and the pulverized agg...

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Abstract

The invention provides a special selenourea slow-release composite fertilizer for rice. The fertilizer is prepared from, by weight percentage, urea, potassium chloride, monoammonium phosphate, sodium selenite pentahydrate, water and ash. The slow-release composite fertilizer further comprises synergist and a dispersion agent. A preparation method includes the steps that formaldehyde is conveyed into a urea melting tank, and sodium selenite pentahydrate is added for reaction to generate a selenourea formaldehyde chelate solution. High-temperature selenourea formaldehyde chelate is sprayed into mist from top to bottom and enters a cylinder granulation device, synergist and the dispersion agent are sequentially heated to 50-80 DEG C, then enter the cylinder granulation device of a fluidized bed and are mixed with smashed blocky fertilizer to form selenourea formaldehyde fertilizer particles, and the special selenourea slow-release composite fertilizer for rice is obtained. The fertilizer is scientific in ratio and comprehensive in nutrient, can gradually and continuously provide nutrients for rice crops, can make nutrients fully absorbed by rice, remarkably promotes rice growth, and remarkably increases the utilization rate of the fertilizer.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a compound slow-release fertilizer rich in selenium. Background technique [0002] At present, the biggest problem facing my country's chemical fertilizers is that the utilization rate is too low. The seasonal utilization rate of nitrogen fertilizer is 30% to 35%, while the international nitrogen fertilizer utilization rate is 50% on average, so how to improve the utilization rate of chemical fertilizer is the top priority in the industry at present. [0003] From 1924, urea-formaldehyde obtained the first patent as a chemical, and after the 1990s, research on urea-aldehyde condensate slow-release fertilizer and its slow-release mechanism. After decades of research, the development of urea-formaldehyde in foreign countries is still relatively fast. The United States, Europe, Japan and the Soviet Union and other countries commercialized urea-formaldehyde fertilizers earlier. Urea-form...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G3/00
CPCC05B7/00C05G3/00C05G5/12C05D1/00C05D1/02C05C9/02C05D9/02
Inventor 经小榆罗毅王经明李森张思杨
Owner 史丹利化肥当阳有限公司
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