离子型稀土尾矿残留铵缓释性分析

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Abstract In order to explore the slow-release of residual NH₄⁺, ion-absorbed type rare earth ore from Xinfeng (Jiangxi Province) was taken as the research object. The leached tailings were prepared by column leaching, and then drip washing with deionized water. Follow the steps of drip washing → sealing and storing → re drip washing, NH₄⁺ amount in drip washed tailings with different water content (1.3%, 15%, 35%, 250%), under different time (15, 30, 60, 120, 180, 195, 210, 240d), different mass transfer mechanisms (convection, diffusion) were investigated. The results show that NH₄⁺ can still be washed out from the drip washed tailings after being sealed and preserved for a long time. NH₄⁺ washing amount is affected by water content, time and mass transfer mechanism. NH₄⁺ washing amount, as a whole, increase with time proceeding, when the water content is ≥15%, and increase with the increase of water content, in the same preserved time. When other conditions are the same, NH₄⁺ washing amount under convective is greater than diffusion. NH₄⁺ re-washed out from the tailings is the result of transformation of NH₄⁺ from exchangeable to water-soluble.

Key words： ion-absorbed type rare earth tailings ammonium slow-release water-soluble exchangeable diffusion double layer

Received: 26 January 2021

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X751

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	Articles by authors
	XIE Fang-fang
	WANG Guan-shi
	LUO Si-hai
	YIN Sheng-hua
	WEN Teng
	ZHANG Shil-iang
	LIU Jian

Cite this article:

XIE Fang-fang,WANG Guan-shi,LUO Si-hai等. Analysis on slow-release of residual ammonium in ion-absorbed type rare earth tailings[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4333-4340.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4333

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