聚磷酸镁铵的制备工艺研究

doi:10.19964/j.issn.1006-4990.2024-0065

Abstract

Abstract:

A new approach was proposed to prepare phosphate fertilizers（magnesium ammonium polyphosphate） containing trace elements such as calcium and magnesium through calcination，in response to the problem of difficult utilization of by-product magnesium ammonium phosphate in the production process of lithium iron phosphate（precursor of iron phosphate）.The process and mechanism of preparing magnesium ammonium polyphosphate from magnesium ammonium phosphate were studied under the conditions of calcination temperature of 250~550 ℃ and calcination time of 0.5~3.0 h.The crystal structure，sample quality change during calcination，gas phase products，morphology，specific surface area，porosity，and particle size of the samples were analyzed by thermogravimetric Fourier transform infrared（TG-IR），X-ray diffraction（XRD），scanning electron microscopy（SEM），nitrogen physical adsorption analyzer，and laser particle size analyzer.The diameter distribution was characterized，revealing the mechanism of the reaction process.The experimental results showed that within a certain range，increasing the calcination temperature and prolonging the calcination time could promote the polymerization of phosphate and improve the denitrification rate.Based on the distribution of phosphorus forms and denitrification rate in the product，the optimal calcination temperature was 350 ℃ and the calcination time was 2 h.Under these conditions，the polymerization degree distribution of phosphorus in magnesium ammonium polyphosphate obtained was 1~3，the polymerization rate reached 45.28%，and the denitrification rate reached 79.90%.The obtained magnesium ammonium polyphosphate showed an improvement of over 30% in nutrient indicators such as available calcium，available magnesium，water-soluble phosphorus，and available phosphorus compared to the original magnesium ammonium phosphate.It could be used as a new type of phosphorus fertilizer containing trace elements such as calcium and magnesium.

Key words: magnesium ammonium phosphate, magnesium ammonium polyphosphate, denitrification, resource recovery

CLC Number:

TQ132.2

XU Miao, XU Dehua, SHOU Zhixin, YANG Wengong, WANG Xinlong. Study on preparation process of magnesium ammonium polyphosphate[J]. Inorganic Chemicals Industry, 2024, 56(12): 88-93.

Figures/Tables 10

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References 13

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养分指标	w（磷酸镁铵）/%	w（聚磷酸镁铵）/%
水溶磷（P₂O_5水）	2.95	4.36
有效磷（P₂O_5有）	34.97	46.02
水有质量比［m（P₂O_5水）/m（P₂O_5有）］	8.44	9.47
有效钙（CaO）	2.63	3.50
有效镁（MgO）	12.73	17.51

	比表面积/（m²·g^-1）	总孔容积/（cm³·g^-1）
磷酸镁铵	39.15±0.12	0.087
聚磷酸镁铵	21.85±0.12	0.061

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation process of magnesium ammonium polyphosphate

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