Fate and Environmental Impact of Thorium Residues During Rare Earth Processing

Findeiß, Matthias; Schäffer, Andreas

doi:10.1007/s40831-016-0083-3

Cited by 31 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mineralization reported here is not of sufficiently high grade or large enough to be economic in its own right. Moreover, the HREE enrichment is intimately associated with an increase in Th, the processing of which provides environmental and social challenges (Findeiß & Schäffer, 2017). Nonetheless, enrichment of HREE and Th in fenite breccias serves as a record of fluid expulsion from a REE-rich carbonatite, and may indicate the presence of LREE mineralization in carbonatite at depth.…”

Section: Hree-rich Fenite Breccias As An Exploration Indicator For Lree Mineralizationmentioning

confidence: 99%

Enrichment of heavy REE and Th in carbonatite-derived fenite breccia

et al. 2021

View full text Add to dashboard Cite

Enrichment of the heavy rare earth elements (HREE) in carbonatites is rare as carbonatite petrogenesis favours the light (L)REE. We describe HREE enrichment in fenitized phonolite breccia, focusing on small satellite occurrences 1–2 km from the Songwe Hill carbonatite, Malawi. Within the breccia groundmass, a HREE-bearing mineral assemblage comprises xenotime, zircon, anatase/rutile and minor huttonite/thorite, as well as fluorite and apatite. A genetic link between HREE mineralization and carbonatite emplacement is indicated by the presence of Sr-bearing carbonate veins, carbonatite xenoliths and extensive fenitization. We propose that the HREE are retained in hydrothermal fluids which are residually derived from a carbonatite after precipitation of LREE minerals. Brecciation provides a focusing conduit for such fluids, enabling HREE transport and xenotime precipitation in the fenite. Continued fluid–rock interaction leads to dissolution of HREE-bearing minerals and further precipitation of xenotime and huttonite/thorite. At a maximum Y content of 3100 µg g−1, HREE concentrations in the presented example are not sufficient to constitute ore, but the similar composition and texture of these rocks to other cases of carbonatite-related HREE enrichment suggests that all form via a common mechanism linked to fenitization. Precipitation of HREE minerals only occurs where a pre-existing structure provides a focusing conduit for fenitizing fluids, reducing fluid – country-rock interaction. Enrichment of HREE and Th in fenite breccia serves as an indicator of fluid expulsion from a carbonatite, and may indicate the presence of LREE mineralization within the source carbonatite body at depth.

show abstract

Section: Hree-rich Fenite Breccias As An Exploration Indicator For Lree Mineralizationmentioning

confidence: 99%

Enrichment of heavy REE and Th in carbonatite-derived fenite breccia

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Thorium [IV] is a radioactive fissionable metal ion, and the embodiment of its radioactive isotopes in living body over a period of time could cause several health hazards like neurotoxicity and other noxious diseases [130].…”

Section: Thoriummentioning

confidence: 99%

Removal of metal ions using Chitosan based electro spun nanofibers: A review

Joseph¹,

Jacob²,

Nair³

et al. 2021

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

Chitosan is a promising environmentally-friendly polymer with a wide range of applications in biological, medical and water treatment fields. Recent research in chitosan-based electro spun nanofibers has led to the very cost-effective and efficient removal of toxic metal ions from solutions that are extremely important in today's pollution-ridden world. Nanofiber fabrication of chitosan blends can easily be done by the novel electrospinning technique. Because of their high adsorption capability, metal chelation ability, nontoxicity, biocompatibility, biodegradability, hydrophilicity, and cost effectiveness, chitosan-based nanofibers have seen rapid growth in water treatment applications. This review outlines the ability of electrospinning produced chitosan-based nanofibers to remove toxic metals. The primary goal of this review is to provide current information on various chitosan blend nanofibers that may be useful in water purification, as well as to encourage further research in this area.

show abstract

“…Breathing in thorium in the workplace may increase the chances of development of lung diseases. Thorium is radioactive and can be stored in bones (Findeiß and Sch€ affer, 2017). Because of these facts, it has the ability to cause bone cancer many years after the exposure has taken place (Keith and Wohlers, 2015).…”

Section: Introductionmentioning

confidence: 99%

Measurement of natural radioactivity in several sandy-loamy soil samples from Sijua, Dhanbad, India

Zubair

Shafiqullah

2020

Heliyon

View full text Add to dashboard Cite

The activity concentrations of natural radionuclides 226 Ra, 232 Th and 40 K in soil samples collected from Sijua Dhanbad, India were measured by using a gamma-ray spectrometer with a NaI(Tl) detector. The average activity concentration of 226 Ra, 232 Th, and 40 K was found as 60.3, 64.5 and 481.0 Bq: kg À1 , respectively. Average radium equivalent activity, absorbed dose rate, outdoor dose, external hazard index and internal hazard index for the area under study is determined as 189.5 Bq: kg À1 , 87.2 nGy h À1 , 0.4, 0.5 and 0.6 mSv: y À1 , respectively. The annual effective dose to the general public is found 0.4 mSv: y À1 . This value lies well below the limit of 1 mSv: y À1 . Measured values have found safe for the environment and public health of the study area.

show abstract

Fate and Environmental Impact of Thorium Residues During Rare Earth Processing

Cited by 31 publications

References 31 publications

Enrichment of heavy REE and Th in carbonatite-derived fenite breccia

Enrichment of heavy REE and Th in carbonatite-derived fenite breccia

Removal of metal ions using Chitosan based electro spun nanofibers: A review

Measurement of natural radioactivity in several sandy-loamy soil samples from Sijua, Dhanbad, India

Contact Info

Product

Resources

About