The Improved Phosphorus Solubility of Mechanochemically Activated Phosphate Rock and Its Effect on Soil-Available Phosphorus in Weakly Acidic Soil

Nana Fang, Shuai Liang, Huimin Dai, Hongye Xiao, Xiaomeng Han and Guodong Liu
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Nana Fang: Shenyang Center of China Geological Survey, Shenyang 110034, China
Shuai Liang: Shenyang Center of China Geological Survey, Shenyang 110034, China
Huimin Dai: Shenyang Center of China Geological Survey, Shenyang 110034, China
Hongye Xiao: Shenyang Center of China Geological Survey, Shenyang 110034, China
Xiaomeng Han: Shenyang Center of China Geological Survey, Shenyang 110034, China
Guodong Liu: Shenyang Center of China Geological Survey, Shenyang 110034, China

Sustainability, 2022, vol. 14, issue 13, 1-12

Abstract: Mechanochemical treatment is an effective and ecological way to treat medium and low-grade phosphate rock (PR) for fertilizer. To explore the phosphorus (P) solubility mechanisms of mechanochemically activated phosphate rock (MAPR) and its P supply capacity, we investigated the chemical properties and infrared spectroscopy (IR) characteristics of different types of MAPR and soil-available P using the chemical extraction method (2% citric acid), IR analysis and soil incubation experiment in this study. The results showed that the P solubility of magmatic, metamorphic and sedimentary types of MAPR increased by 7.76–13.67, 0.6–1.64 and 0.91–2.68 times, respectively, compared with the initial PR. The IR analysis demonstrated that the isomorphous substitution (B-type of CO 3 2− for PO 4 3− and OH − for F − ) occurred in the apatite and β-Ca(PO 3 ) 2 was generated with better P solubility. The dynamic changes in soil-available P (Bray and Kurtz method) treated by MAPR significantly increased by 3.81–6.57-, 2.49–5.4- and 4.98–8.39-fold, respectively, within 100 days in red soil (pH 5.94), compared with the initial PR. In conclusion, the significant increase in P solubility of MAPR and soil-available P in weakly acidic soil was due to the improved reactivity of MAPR during the process of mechanochemical activation.

Keywords: mechanochemical activation; phosphate rock; phosphorus solubility; infrared spectrum analysis; soil-available phosphorus (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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