磷尾矿热分解动力学机理与煅烧工艺研究

doi:10.19964/j.issn.1006-4990.2022-0295

Abstract

Abstract:

Relatively high content of calcium，magnesium and phosphorus exists in phosphorus tailings.To produce magnesium salt from phosphorus tailings by calcination-leaching process，it is necessary to calcine and decompose phosphorus tailings into CaO and MgO to achieve the purpose of activation and purification.The thermal decomposition mechanism of phosphorus tailings is of great significance to the quality of magnesium salt and selection of calcination process.The thermal decomposition kinetic characteristics and calcination process of phosphorus tailings were explored，so as to provide theoretical guidance for the recycling of phosphorus tailings resources.The results showed that the non isothermal thermal decomposition process of phosphorus tailings could be divided into two stages in the process of heating rate of 10 ℃/min and calcination temperature rising from 25 ℃ to 1 000 ℃.Dolomite was decomposed into the first stage of calcium carbonate and magnesium oxide at 400 ℃ to 500 ℃，and calcium carbonate was decomposed into the second stage of calcium oxide at 700 ℃ to 900 ℃.The corresponding kinetic equations of thermal decomposition were established respectively.The better calcination conditions were calcination temperature of 900 ℃，calcination time of 4 h，heating rate of 15 ℃/min，tailings size of less than 0.150 mm.

Key words: phosphate ore tailings, calcination, thermal decomposition, mechanism, non-isothermal kinetics

CLC Number:

TF046

ZHOU Qiang, WU Bin, CHEN Kui, JI Lijun, WU Yanyang. Study on thermal decomposition kinetic mechanism and calcination process of phosphorus tailings[J]. Inorganic Chemicals Industry, 2023, 55(3): 47-54.

Figures/Tables 14

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项目	化学成分质量分数/%
项目	CaO	MgO	P₂O₅	Al₂O₃	Fe₂O₃	S	SiO₂	CO₂
磷尾矿	28.14	17.3	9.175	1.52	3.10	1.43	5.411	33.8

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Study on thermal decomposition kinetic mechanism and calcination process of phosphorus tailings

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