A kind of preparation method of humic acid coated urea
A technology of coating urea and humic acid, which is applied in the field of preparation of humic acid-coated urea, can solve the problems of complex coating agent production and coating process, large amount of coating agent, poor storage stability of urea particles, etc. Enhanced self-regulation ability, increased soil organic matter content, and beneficial to the sustainable development of agriculture
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[0020] This embodiment provides a preparation method of humic acid-coated urea, which includes the following steps.
[0021] Step 1. Add humic acid raw powder and trisodium phosphate into sodium hydroxide or potassium hydroxide aqueous solution, that is, use sodium hydroxide or potassium hydroxide aqueous solution and trisodium phosphate to activate humic acid raw powder, and mix at 100°C React for 1 hour, centrifuge and collect the filtrate to obtain sodium humate or potassium humate solution.
[0022] The humic acid: sodium hydroxide (or potassium hydroxide): trisodium phosphate mass ratio is 10:0.6:0.4.
[0023] Step 2. Add 2% PVA-1788 to the sodium humate or potassium humate solution to make it fully miscible, and then dry the solution with a hot cylinder dryer until the water content is less than 10%, to obtain sodium humate or Potassium humate dry product.
[0024] Step 3, crush the dried product to 100-200 mesh, and use it as a coating agent for humic acid-coated urea...
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