半水磷石膏地下充填材料的磷和氟浸出特性及地球化学模拟

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Abstract The HPG as backfill material was selected as the research subject. The leaching characteristics and long-term release of phosphorus and fluorine in four kinds of HPG and HPGB cemented paste filling materials were evaluated by pH-dependent and semi-dynamic leaching tests under simulated groundwater leaching conditions. The controlling mechanisms of phosphorus and fluorine leaching characteristics was discussed by geochemical simulation analysis. The results showed that 99.97% soluble phosphorus and 95.92% fluoride were solidified as Ca₃(PO₄)₂ and CaF₂ in HPGB which was modified by quicklime. According to the pH-dependent leaching test, the leaching concentration of total phosphorus had no significant relationship with pH under neutral and alkaline conditions. The geochemical simulation results of the semi-dynamic leaching test indicated the controlling phase of phosphorus in HPGB is fluoroapatite. The major controlling phase of fluorine leaching was fluorite and fluoroapatite, and the proportion of fluorite controlling phase decreased from 95% to 90% after long term leaching test.

Key words： filling mining paste solidification leaching pH-dependent leaching long-term stability

Received: 12 June 2021

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X751

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	Articles by authors
	ZHU Xue-tao
	DU Bing
	A Man-jiao
	KANG Ti
	CHEN Deng-mei
	SHI Jian-hua
	LIU Jian-guo

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ZHU Xue-tao,DU Bing,A Man-jiao等. Leaching properties of phosphorus and fluorine in hemihydrate phosphogypsum as underground filiing materials and geochemical simulation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 680-687.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/680

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