kajal kaolin deposit is located ~20 km northwest of hashtjin, ardebil province. field evidence and laboratory investigations show that the deposit is an alteration product of ignimbrites, tuffs, and trachy-andesites of eocene age. according to mineralogical data, the major rock-forming minerals include kaolinite, montmorillonite, polygorskite, orthoclase, zeolite (stilbite), quartz, and chalced...

The cell wall (CW) is critical for the accumulation of heavy metals in metal-tolerant plants. Polysaccharides, main component CW, contribute significantly to immobilization metals. However, mechanisms rare earth elements (REEs) adsorption and detoxification by polysaccharides walls Phytolacca americana L. (P. americana) remain unclear. In this work, we explored binding sites REEs modifications ...

Phosphorus (P) is an important biogeochemical element and the environmental fate of P receives increasing attention. Through batch equilibration experiments, the adsorption and desorption of P in the absence and presence of exogeneous rare earth elements (REEs) were investigated in five types of agricultural soil samples collected from China. The results showed that the addition of different do...

Rare Earth Elements (REEs) are essential for sustainable energy technologies. Techno-economic Assessments (TEAs) have been conducted to evaluate innovative approaches recover REEs from waste streams. However, most TEA studies do not consider the price volatility of REEs, which raises concern over reliability analysis in an unpredictable dynamic market. To address this shortcoming, a model is pr...

With the rapidly expanding use of fluorescent lamps (FLs) and increasing interest in conservation and sustainable utilization of critical metals such as rare earth elements (REEs), the recovering of REEs from phosphors in waste FLs is becoming a critical environmental and economic issue. To effectively recycle REEs with metallurgical methods, mechanical activation by ball milling was introduced...

Recent years have witnessed increasing awareness and interest in rare earth elements (REE). These several, usually unfamiliar elements, are key components of countless products used our daily lives. Because their use many modern technologies, including those important for national security, the demand REE grows, so does production, need to find new sources improve extraction. This article provi...

INTRODUCTION Through leaching experiments and simulated rainfall experiments, characteristics of vertical leaching of exogenous rare earth elements (REEs) and phosphorus (P) and their losses with surface runoff during simulated rainfall in different types of soils (terra nera soil, cinnamon soil, red soil, loess soil, and purple soil) were investigated. RESULTS AND ANALYSES Results of the lea...

Rare earth elements (REE) are either housed in exotic REE minerals that sporadically populate the host rock or they occur as ionic substitutions in the crystal structure of existing rock-forming minerals. The genesis of REEs in carbonatite rocks can result in intricate mineralogical textures between REE minerals, host rock minerals, and minerals formed by later processes. Upfront mineralogical ...

This study aims to investigate and optimize the effects of the main parameters including the particle size, gravity and magnetic separation combination, high gradient magnetic separation, magnetic field intensity, shaking table slope, washing water flow, and electrostatic separation upon the rare earth element (REE) recoveries from iron mine waste. The electron microprobe showed that high amoun...

In this paper, we examine disruptions in the automobile manufacturing supply chain that resulted from COVID19 pandemic. We explore relationships between organizational resilience and agility agility. frame exploration terms of rare earth elements (REEs) microchips, supplies come Tier 3 4 chain. look at some adaptations made by Volkswagen to adapt these but note adaptation does not always result...