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Review on treatment and utilization of barium slag in China TEXT SIZE: A A A

Barium slag (BS) is generated as a by-product waste during the production of barium salts from barite. A large amount of BS is discharged annually threating the ecological environment and restricting the development of the barium salts industry. In China, BS is classified as hazardous waste due to its corrosivity, and more importantly because of its extraction toxicity of barium. Soluble barium is toxic and can result in barium poisoning for environment and human beings. The current review presents a detailed summary on general characteristics, discharge and disposal status, harmless treatment pathways and comprehensive utilization of BS in China. BaO, SiO2, CaO, and SO3 occur as main chemical compositions in BS, especially BaO accounting approximately for 35-40%. The mineral compositions include unreacted barite, quartz, clay minerals, newly-formed phases from the side reactions such as BaCO3, BaSiO3 and BaSO3, and residual carbon. A special attention is given to the assessment of the harmless treatment methods for BS from hazardous waste to general waste, which will decrease its management costs. Precipitation and solidification of soluble barium is the common pathway for harmless treatment of BS, and the using of other industrial waste can realize cost-saving. Methods for comprehensive utilization of BS include recovery of barium and carbon, application in building materials, and using as adsorbents for wastewater treatment. In particular, we analyzed and discussed the advantages and disadvantages of these existing process routes, intending to promote potentials for comprehensive utilization of BS in the future.

Publication name

 Journal Of Environmental Management, Volume 325, Part A, Article Number 116461, DOI 10.1016/j.jenvman.2022.116461, Published JAN 1 2023

Author(s)

 Gu, Hannian; Yang, Yuxin; Guo, Tengfei; Xiao, Jianhua; Gao, Yushi; Wang, Ning

Corresponding author(s) 

 Gu, Hannian; Wang, Ning
 guhannian@vip.gyig.ac.cnnwangig@163.com
 Chinese Acad Sci, Inst Geochem, Key Lab Hightemp & Highpressure Study Earths Inte, Guiyang 550081, Peoples R China

Author(s) from IGCAS   Gu, Hannian; Wang, Ning; Yang, Yuxin; Guo, Tengfei

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