Recycling of High-Purity Strontianite and Hematite from Strontium-Bearing Sludge

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Recycling of High-Purity Strontianite and Hematite from Strontium-Bearing Sludge
	Bian, Rui; Su, Ting; Chen, Yu; Qu, Zhan; Zhu, Suiyi; Tian, Xi; Huo, Yang
刊名	ACS OMEGA
	2020-06-16
卷号	5 期号:23 页码:14078-14085
ISSN号	2470-1343
英文摘要	Sr-bearing sludge is a hazardous waste that is commonly generated by nuclear power plants and mineral refining operations. In this work, Sr-bearing sludge was simulated and then cleanly recycled into high-purity strontianite with hematite nanoparticles as a byproduct via a novel hematite precipitation route. The sludge contained 26.1% Fe, 3.5% Sr, and Si impurities. After dissolution in 1.2 M nitric acid, the sludge was treated hydrothermally with the addition of glycol to precipitate Fe effectively. Without the addition of glycol, only 52% Fe was hydrothermally precipitated in the form of hematite aggregates. With the addition of glycol at the optimal M-glycol/M-nitrate molar ratio of 0.4, nearly 100% Fe was removed in the form of hematite nanoparticles with an average diameter of 50 nm, whereas over 98% of Sr was retained in the leachate. The generated hematite was highly purified with an Fe2O3 content of 95.23%. Sr was present at a high concentration of 3.9 g/L in the treated leachate and further precipitated in the form of strontianite with a purity of 96.8% through Na2CO3 addition. Tertiary butanol (TeB) exhibited a similar Fe removal rate as glycol even though its optimal M-TeB/M-nitrate te molar ratio was 0.1, which was approximately one-fourth the optimal molar ratio. Fe removal involved spontaneous Fe3+ hydrolysis under hydrothermal conditions and was promoted by M-glycol/M-nitrate increasing the pH of the redox reaction between nitrate and glycol and/or TeB. The method reported here successfully enabled the resource recycling of Sr-bearing sludge to generate high-purity strontianite and hematite products without producing any secondary waste.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45354]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Bian, Rui,Su, Ting,Chen, Yu,et al. Recycling of High-Purity Strontianite and Hematite from Strontium-Bearing Sludge[J]. ACS OMEGA,2020,5(23):14078-14085.
APA	Bian, Rui.,Su, Ting.,Chen, Yu.,Qu, Zhan.,Zhu, Suiyi.,...&Huo, Yang.(2020).Recycling of High-Purity Strontianite and Hematite from Strontium-Bearing Sludge.ACS OMEGA,5(23),14078-14085.
MLA	Bian, Rui,et al."Recycling of High-Purity Strontianite and Hematite from Strontium-Bearing Sludge".ACS OMEGA 5.23(2020):14078-14085.