半水磷石膏充填体离子固化与尺寸效应

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Abstract

In view of the environmental pollution caused by the accumulation of phosphogypsum, a solution was proposed to treat the HPG as a filling material with innocuous treatment. Through osmosis test, physical property test and chemical composition analysis test of HPG, the regularity of elemental release was studied with different lime content, different size and different curing time. The results showed that adding 2% lime to HPG had the best curing effect on P, F or other potentially harmful elements in HPG, and the compressive strength of the prepared filling blocks could reach 7.4MPa in three days. At the same time, its penetration resistance increased by more than 3000times. The dissolution rate per unit area of HPG in deionized water was obtained by immersion test. When the exposed area of filling body is 4square meters, the total amount of P, F, Ca²⁺ and SO₄^2- dissolved in water was 0.84, 0.32, 27.84 and 89.32g per day. It was also found that the ion dissolution of HPG specimens had a size effect. Under the same conditions of immersion time and solid-liquid ratio, increasing the size of backfill can reduce the ion dissolution rate.

Key words： hemihydrate phosphogypsum (HPG) ion curing in precipitation size effect mine filling harmless disposal

Received: 28 May 2018

PACS:	X751
	TD853

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	Articles by authors
	LAN Wen-tao
	WU Ai-xiang
	WANG Yi-ming
	WANG Jia-cai
	LI Jian-qiu

Cite this article:

LAN Wen-tao,WU Ai-xiang,WANG Yi-ming等. Ionic solidification and size effect of hemihydrate phosphogypsum backfill[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 210-218.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/210

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