Nano-hybrid N and P slow-release fertilizer and preparation method thereof

A slow-release fertilizer and hybrid technology, applied in nitrogen fertilizers, phosphate fertilizers, fertilization devices, etc., can solve the problems of narrow application range, high cost, complicated preparation process of slow-release fertilizers, etc., achieve high stability constant, reduce nitrogen fertilizer loss, avoid The effect of slowing down the loss of performance

Inactive Publication Date: 2022-01-18
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex preparation process and high cost of slow-release fertilizers, their application range is still narrow

Method used

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  • Nano-hybrid N and P slow-release fertilizer and preparation method thereof
  • Nano-hybrid N and P slow-release fertilizer and preparation method thereof
  • Nano-hybrid N and P slow-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment provides a kind of preparation method of nano-hybrid N, P slow-release fertilizer, such as figure 1 As shown, the specific process is:

[0026] Add urea and slaked lime into water according to the molar ratio of urea: calcium ion is 5:1, stir vigorously and mix evenly to obtain a mixed slurry. Add cetyltrimethylsodium bromide (CTAB) in an amount of 2% of the mass of the calcium salt, and vigorously stir to dissolve CTAB. Prepare a mixture of phosphoric acid and potassium dihydrogen phosphate at a molar ratio of phosphate and calcium ions of 0.6:1, and dissolve it in water to obtain a phosphoric acid / potassium dihydrogen phosphate solution. Then the phosphoric acid / potassium dihydrogen phosphate solution, and the mixture of urea, slaked lime and CTAB are pumped into the reaction vessel that has been preheated to 90°C. After stirring and reacting at 90° C. for 60 minutes, spray drying is carried out to obtain nano-hybrid N, P slow-release fertiliz...

Embodiment 2

[0034] This embodiment provides a preparation method of nano-hybrid N, P slow-release fertilizer, the specific process is:

[0035] Add urea, calcium chloride, and lime into water according to the molar ratio of urea:calcium ion 2:1, stir vigorously and mix evenly to obtain a mixed slurry. Sodium dodecylsulfonate (SDS) was added in an amount of 2% of the mass of the calcium salt, and vigorously stirred to dissolve the SDS. Prepare a mixture of phosphoric acid and diammonium hydrogen phosphate at a molar ratio of phosphate to calcium ions of 0.55:1, and dissolve it in water to obtain a phosphoric acid / diammonium hydrogen phosphate solution. Then pump the mixture of urea, calcium chloride, lime mixed slurry and SDS, and phosphoric acid / diammonium hydrogen phosphate solution into the reaction vessel that has been preheated to 50°C. After stirring and reacting at 50° C. for 180 minutes, spray drying is carried out to obtain nano-hybrid N, P slow-release fertilizer.

Embodiment 3

[0037] This embodiment provides a preparation method of nano-hybrid N, P slow-release fertilizer, the specific process is:

[0038] Add urea and slaked lime into water according to the molar ratio of urea:calcium ion 4:1, stir vigorously and mix evenly to obtain a mixed slurry. Add the surfactant Tween 80 in an amount of 1.0% of the mass of the calcium salt, heat to 40° C. and vigorously stir to dissolve the Tween 80. Prepare a mixture of sodium hexametaphosphate and ammonium phosphate at a molar ratio of phosphate to calcium ions of 0.6:1, and dissolve it in water to obtain a sodium hexametaphosphate / ammonium phosphate solution. Put the mixture of urea, slaked lime mixed slurry and Tween 80, and sodium hexametaphosphate / ammonium phosphate solution into the reaction vessel that has been preheated to 60°C with a pump, and stir and react at 60°C for 120min. Spray-drying is carried out to obtain nano-hybrid N, P slow-release fertilizer.

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Abstract

The invention discloses a nano-hybrid N and P slow-release fertilizer and a preparation method thereof. The preparation method comprises the steps of mixing urea and calcium salt for pulping, and preparing mixed slurry of the urea and the calcium salt; adding an organic surfactant into the mixed slurry, and uniformly mixing; dissolving phosphoric acid or phosphate in water to obtain a phosphoric acid or phosphate solution; adding clear water into a reactor, heating, and simultaneously adding a mixture of the phosphoric acid or phosphate solution, the mixed slurry and the surfactant into the reactor for reaction; and carrying out solid-liquid separation on the material obtained after the reaction is completed, wherein the obtained solid is the N and P hybrid slow-release fertilizer. According to the invention, the fertilizer efficiency of the fertilizer can be improved, the production cost can be reduced, and meanwhile, negative influences caused by the fact that unutilized products enter the surrounding environment due to fertilizer decomposition can be reduced.

Description

technical field [0001] The invention relates to the technical field of ecological materials, in particular to a nano-hybrid N, P slow-release fertilizer and a preparation method thereof. Background technique [0002] Mineral resources play an extremely critical role in the development of the national economy, but a large number of abandoned lands are often formed in the development of mineral resources. According to incomplete statistics, the area of ​​mine abandoned land in the world is about 6.7 million hectares, of which open-pit mining damage and abandoned land account for about 50%. A large number of abandoned mines have brought great potential environmental and safety risks, and ecological restoration is urgently needed. Due to the coarse particle size and low nutritional content of the waste rock in the abandoned mine, its ability to retain water and fertilizer is poor. If it is an abandoned metal sulfide mine, there is also the problem of mine acid wastewater, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G3/50
CPCC05G3/40C05G3/50C05B7/00C05C9/00
Inventor 庄荣传王乾坤王弘沈青峰季常青江莉池荷婷肖琴廖祥辉
Owner 厦门紫金矿冶技术有限公司
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