Carbonatite intrusions host the world's most important light rare earth element (LREE) deposits, and their formation generally requires extraordinary fertile sources, magmatic evolution, and hydrothermal events. However, carbonatitic magma evolution, particularly the role of fractional crystallization and contamination from silicate …

With the increasing mining activities in China,the surrounding eco-environment of mines is faced with unprecedented pressure,including a series of resources,ecological,and environmental problems.This paper introduced the main methods and technical processes for strip mining of typical rare earth ore,summarized the radioactive,heavy …

Over-exploitation of rare-earth elements causes cadmium (Cd)- and lead (Pb)-contamination of rare-earth mine tailings. Here, Paspalum conjugatum was used as a hyperaccumulating perennial herb to evaluate its phytoextraction potential for removing metals in a hydroponic experiment. Further, an in-situ experiment was conducted for two …

Ultimately, The Contamination of the Earth adds to the expanding debate about our global ecological crisis and our awareness of the influence that politics and economics have over that crisis. The book demonstrates that the history of pollution should be viewed at least partially through political and economic lenses. Thus, the work offers …

Rare earth elements (REEs) are increasingly critical to the high-technology and low-carbon economy. With a shift to sustainable socioeconomic development that aims to be less fossil fuel dependent, global demand for REEs continues to rise, despite their uncertain supply chain and high environmental impact of production. Here, we review …

The rare earth elements (REEs) are a group of seventeen chemical elements comprising the 15 lanthanides elements (lanthanum to lutetium), scandium (Sc) and yttrium (Y) ... The aim of this study was to identify contamination hotspots of Ce, La, Nd, Sc, Sm, Yb and Y in the urban soils of London city using the local Moran's I index and GIS. The ...

Rare earth elements (REEs) are seventeen metal elements with unique properties from their 4f valence electron shells. ... REEs specificity, and easy recovery without generating secondary pollution are required to solve these emerging REEs contamination and recovery problems. Various adsorbents have been studied to extract …

Introduction. Rare earth elements (REEs: La–Lu) are a group of chemically similar elements that are industrially important due to their use in modern commodities such as high technology, agricultural fertilization, medical techniques and also widely used as tracers in geoscience (Adeel et al., 2019; Shajib et al., 2020).

Background.. Rare earth element (REE) composition of atmospheric dust has recently been used to trace potential sources of dust pollution.Objective.. The present study aimed to determine the sources of atmospheric pollution in the study area using REE patterns and determine their level of pollution.Methods.. Twenty-five (25) atmospheric …

Contamination factor and the degree of contamination of rare earth elements. To describe the contamination of REE in the study area, it is important to calculate the contamination factor (Cf) and degree of contamination, accordingly, using the formula developed by Hakanson, 1980, shown in Equation 3:44

Rare earth elements (REE) are essential for sustainable energies such as solar and wind power, with rising demand due to the ambitious goal for a circular society. …

For every ton of rare earth produced, the mining process yields 13kg of dust, 9,600-12,000 cubic meters of waste gas, 75 cubic meters of wastewater, and one ton of radioactive residue. This stems …

The mining and leaching processes of rare-earth mines can include the entry of potentially toxic elements (PTEs) into the environment, causing ecological risks and endangering human health. However, the identification of ecological risks and sources of PTEs in rare-earth mining areas is less comprehensive. Hence, we determine the PTE …

The 222 Rn activity concentration and air absorbed dose rate of a rare earth waste slag heap in China were measured by radon and air absorbed dose rate instruments. A total of 34 monitoring points including waste residue heaps were selected. The 222 Rn activity concentration and absorbed dose rate measurement ranges are 51.0–246.9 …

It is the by-product of rare earth processing. It is open to the air but worse it is seeping into the ground below, poisoning the water. The Chinese authorities are aware of the problem.

The large volumes of tailings that are generated during hard rock mining are a source of waterborne contamination. Tailings are also a major environmental hazard if the tailings impoundment dam fails. Dust and gaseous emissions are also important vectors for both environmental contamination and the exposure of workers to toxic substances.

Rare earth elements (REEs) are important raw materials for green technologies. However, REE mining and production uses techniques that are often not …

Thus, the contamination may contribute to their release into surrounding ecosystems. This review paper aims to understand the bioavailability, accumulation, …

Rare earth ores are often laced with radioactive thorium and uranium. ... Water Contamination. For instance, one of the chemicals used in the leaching of rare earth ores is concentrated sulphuric acid, which …

Rare earth elements (REEs) are important raw materials for green technologies. However, REE mining and production uses techniques that are often not environmentally sustainable. Life cycle assessment (LCA) is a well-recognized method for evaluating the environmental impacts of products and technologies. This article provides …

Rare earth elements, known as lanthanides on the periodic table, include 15 chemical elements with atomic numbers 57 through 71. Yttrium (atomic number 39) and scandium (atomic number 21) are also included because they have similar chemical properties as the lanthanide series. Rare earth elements have high electrical …

INTRODUCTION. Rare earth elements (REEs) are essential raw materials for aerospace, permanent magnets, electric vehicles and renewable energy generation as part of the group of so-called critical metals (Chakhmouradian & Wall, 2012; Linnen et al., 2014; Wall & Pell, 2020).Carbonatite-related REE deposits are the world's most …

Rare earth metals — those 17 chemically similar elements at the bottom of the periodic table — are in almost every piece of technology we use from cell phones to wind turbines to electric cars. Because these elements are so similar to each other, the process of separating them is time consuming, expensive, and dangerous. ...

Rare earth elements (REEs) are emerging micropollutants in aquatic environments. In this study, concentrations of REEs and major elements, and mineralogical compositions of sediments from lower reaches of the Xiangjiang River (China) were analyzed using ICP-MS technique. The results suggested that s …

Background. Rare earth element (REE) composition of atmospheric dust has recently been used to trace potential sources of dust pollution. Objective. The present study aimed to determine the sources of atmospheric pollution in the study area using REE patterns and determine their level of pollution. Methods. Twenty-five (25) atmospheric …

Heavy REEs contamination at ion-adsorption rare earth mine sites, especially stream waters and farmland soils. • Heavy soil weathering and leaching activities within the tailings in which LREEs were preferentially leached. • REEs fractionation and anomalies facilitate to understand REEs geochemistry within ion-adsorption rare earth …

Furthermore, we try to generate the potential contamination of rare earth elements using the ecological risk index. 2. Materials and methods2.1. Study area. The study was performed at 3 different sites (Pangalengan, Wayangwindu, and Lembang) in Bandung Basin at West Java Province, Indonesia, at 1137–1392 ...

Back in 1982, a rare earth metal extracting company called Asia Rare Earth Sdn Bhd (ARE) was opened in Bukit Merah, Perak.The biggest shareholders for this company was the Mitsubishi Chemical Industries Ltd and Beh Minerals (both owning a 35% share), with Tabung Haji and other Bumiputra businessmen owning lesser shares.. …

11,000 tonnes of Rare Earth Chloride and associated products and High Pure Rare Earths (HPRE) plant at Rare Earth Division, Aluva, to produce separated Rare Earth Oxide/Carbonates. The Company is also in the process of facilitation, setting up of industry in value chain of minerals produced other than expanding its existing capacity in near ...

Rare earth elements (REEs) have become important metals in modern-day technology. The process of discarding obsolete equipment containing REEs, use of REEs containing phosphate fertilizers, mining, and dispersion from indigenous rocks may increase the likelihood of REEs contamination in water bodies. Thus, the contamination may …