Nanometer apatite phosphate fertilizer and preparation method thereof

An apatite and nanotechnology, which is applied in the field of nano-apatite phosphate fertilizer and its preparation, can solve the problems of not being able to realize and reduce soil fixation well at the same time, and achieve the effect of reducing the fixation of soil to phosphorus

Inactive Publication Date: 2011-02-16
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the long-acting slow-acting phosphate fertilizers produced by these two types of methods cannot effectively reduce

Method used

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  • Nanometer apatite phosphate fertilizer and preparation method thereof
  • Nanometer apatite phosphate fertilizer and preparation method thereof
  • Nanometer apatite phosphate fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare 0.835 mol / L Ca(NO 3 ) 2 and 0.5 mol / L (NH 4 ) 2 HPO 4 solution, the pH value is adjusted to 11 with 0.1-1 mol / L ammonia water, and the molar ratio of Ca and P is 1.67, and (NH 4 ) 2 HPO 4 The solution was slowly added dropwise to the Ca(NO 3 ) 2 The solution was stirred with a magnetic stirrer at the same time, and the obtained precipitate was transferred to a tripod flask. After shaking in a horizontal shaker for 12 h, the sample was dried at 110 °C, and finally ground with an agate mortar.

[0039] The nano-apatite phosphate fertilizer that makes, its X-ray diffractogram and transmission electron microscope photograph are respectively as follows figure 1 and figure 2 shown. Depend on figure 1 It can be seen that the nano-apatite phosphate fertilizer has broad diffraction peaks at 2θ values ​​of 26°, 32°, 34°, 40°, 47° and 50° on the X-ray diffraction pattern. Depend on figure 2 It can be seen that the nano-apatite phosphate fertilizer includes n...

Embodiment 2

[0042] Prepare 1.67 mol / L Ca(NO 3 ) 2and 1 mol / L (NH 4 ) 2 HPO 4 solution, the pH value is adjusted to 11 with 0.1-1 mol / L ammonia water, and the molar ratio of Ca and P is 1.67, and (NH 4 ) 2 HPO 4 The solution was slowly added dropwise to the Ca(NO 3 ) 2 The solution was stirred with a magnetic stirrer at the same time, and the obtained precipitate was transferred to a tripod flask. After shaking in a horizontal shaker for 12 h, the sample was dried at 110 °C, and finally ground with an agate mortar.

Embodiment 3

[0044] Prepare 0.835 mol / L Ca(NO 3 ) 2 and 0.5 mol / L Ca(H 2 PO 4 ) 2 solution, the pH value is adjusted to 11 with 0.1-1 mol / L ammonia water, and the molar ratio of Ca and P is 1.67, and Ca(H 2 PO 4 ) 2 The solution was slowly added dropwise to the Ca(NO 3 ) 2 The solution was stirred with a magnetic stirrer at the same time, and the obtained precipitate was transferred to a tripod flask. After shaking in a horizontal shaker for 12 h, the sample was dried at 110 °C, and finally ground with an agate mortar.

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Abstract

The invention discloses a nanometer apatite phosphate fertilizer and a preparation method thereof. The nanometer apatite phosphate fertilizer is prepared by the steps of carrying out precipitation reaction or hydro-thermal reaction on a phosphorus base solution and a calcium base solution. The nanometer apatite phosphate fertilizer comprises 33.2-100 percent by weight of nanometer hydroxylapatite with the average grain diameter of 20-50 nanometers. The solid nanometer apatite phosphate fertilizer can not cause aquatic environment pollution by running off with rain water after being fertilized into soil and can obviously increase the content of rapidly available phosphorus contained in the soil in a short time, effectively reduce the fixation of the soil on the rapidly available phosphorus and keep the content of the rapidly available phosphorus contained in the soil at an appropriate (20-40 mg/kg) level and an abundant (more than 40 mg/kg) level for a long time; in addition, the nanometer apatite phosphate fertilizer does not have bad soil ecological effect and can realize the in-situ inactivation of pollutants if fertilized into soil polluted by the pollutants, such as heavy metals and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizer production, and relates to a phosphate fertilizer and a preparation method thereof, in particular to a nano-apatite phosphate fertilizer and a preparation method thereof. Background technique [0002] Phosphorus (P) is a macronutrient element necessary for the growth and development of crops, and phosphorus is a limiting factor for crop growth in some crop production areas in my country. Rational application and use of phosphorus fertilizers is an important factor to improve crop yield and quality and ensure agricultural production benefits. There are two problems in the application process of quick-acting phosphate fertilizers. On the one hand, this water-soluble phosphate fertilizer will enter the groundwater and water bodies, causing or aggravating eutrophication of water bodies and polluting the environment; After the quick-acting phosphate fertilizer is applied to the soil, it wi...

Claims

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Application Information

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IPC IPC(8): C05B17/00
Inventor 魏正贵王瑜何春建魏巍崔静
Owner NANJING NORMAL UNIVERSITY
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