scholarly journals Assessment of Trace Elements in Soils and Sediments in the Abandoned Mercury Mine Site in Puerto Princesa City, Philippines

2021 ◽  
Vol 38 (2) ◽  
Author(s):  
Jessie Samaniego ◽  
Cris Reven Gibaga ◽  
Alexandria Tanciongco ◽  
Rasty Rastrullo
Keyword(s):  
Heavy Metals ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Contamination Factor ◽  
Area Measurement ◽  
Open Pit ◽  
Radioactive Elements ◽  
Mercury Mine ◽  
Naturally Occurring ◽  
Soil And Sediment

An abandoned mercury mine area in Puerto Princesa City, which was previously operated by Palawan Quicksilver Mines, Inc. (PQMI) from 1953 to 1976, is known for its unrehabilitated open-pit of mercury-rich rocks and exposed mine waste calcine stockpiles in the vicinity. In order to establish an understanding on the geology of the abandoned mercury mine deposit and to obtain clues in determining the possible metal pollutants in the area, measurement of trace element concentrations of soil and sediments collected from the PQMI vicinity were conducted. Soil and sediment samples were analyzed for heavy metals, rare-earth elements and naturally occurring radioactive elements and determined its contamination factor as part of risk assessment. Analytical results showed that aside from mercury, several heavy metals (nickel, chromium, manganese) were found to be anomalous due to the geology of the area. Statistical analyses show that chromium, nickel and antimony present the highest contamination factor among the sampling groups. Mercury is found to have negative bias with higher rare earth elements concentration but positively correlated with arsenic, antimony, and thallium. In general, there is low concentration of rare earth elements (except for scandium) in comparison with its respective average crustal concentration. Due to the nature of geology in the area, naturally occurring radioactive elements influence is also minimal. The results of this study, especially on the assessment of soil and sediment pollutants, are recommended as guidance to its mine rehabilitation.

Rare-earth elements, thermal history, and the colour of natural fluorites

1987 ◽  
Vol 24 (10) ◽  
pp. 2082-2088 ◽  
Author(s):  
D. L. Naldrett ◽  
Andre Lachaine ◽  
S. N. Naldrett
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Absorption Spectra ◽  
Thermal History ◽  
Colloidal Particles ◽  
Radioactive Elements ◽  
Purple Colour ◽  
Naturally Occurring ◽  
Ionizing Radiations ◽  
Photo Acoustic Spectroscopy

The contents of La and of all 13 naturally occurring rare-earth elements (REEs) in samples of natural fluorites were determined by neutron activation analysis. The samples were chosen to test the relation of REE content to colour. Total REE contents of the samples ranged from 3.46 to 97.2 ppm; the range of the least abundant REE, Lu, was 0.031–0.57 ppm and the range of the most abundant REE, Ce, was 0.94–33.3 ppm. No relation was found between the absolute amounts nor the enrichment or depletion of a particular REE and colour. The absorption spectra from 400 to 700 nm were determined by photo-acoustic spectroscopy using a few milligrams of powdered fluorite sample. Optical absorption spectra were obtained for all samples including those that were too small or too opaque for transmission or reflectance methods. The absorption maxima obtained are similar to those reported by others for samples of similar colours. It is concluded that ionizing radiations from incorporated radioactive elements produce the divalent REE ions that account initially for purple colour. From the description given in the literature on the thermoluminescence of fluorites it is then shown that the thermal history can account for the ultimate colour. However, other factors, such as the presence of water vapour, oxygen, or hydrogen; variation in the growth rate of crystals; colloidal particles; and exposure to light, can contribute to the colour.

scholarly journals Two-Step Solvent Extraction of Radioactive Elements and Rare Earths from Estonian Phosphorite Ore Using Nitrated Aliquat 336 and Bis(2-ethylhexyl) Phosphate

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 388
Author(s):  
Silvester Jürjo ◽  
Liis Siinor ◽  
Carolin Siimenson ◽  
Päärn Paiste ◽  
Enn Lust
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Rare Earth Elements ◽  
Toxic Elements ◽  
Downstream Processing ◽  
Liquid Extraction ◽  
Aliquat 336 ◽  
Radioactive Elements ◽  
Improved Method ◽  
Ph Values

Estonian phosphorite ore contains trace amounts of rare earth elements (REEs), many other d-metals, and some radioactive elements. Rare earth elements, Mo, V, etc. might be economically exploitable, while some radioactive and toxic elements should be removed before any other downstream processing for environmental and nutritional safety reasons. All untreated hazardous elements remain in landfilled waste in much higher concentration than they occur naturally. To resolve this problem U, Th, and Tl were removed from phosphorite ore at first using liquid extraction. In the next step, REE were isolated from raffinate. Nitrated Aliquat 336 (A336[NO3]) and Bis(2-ethylhexyl) Phosphate (D2EHPA) were used in liquid extraction for comparison. An improved method for exclusive separation of radioactive elements and REEs from phosphorite ore in 2-steps has been developed, exploiting liquid extraction at different pH values.

Phosphoric acid purification sludge: Potential in heavy metals and rare earth elements

2019 ◽  
Vol 83 ◽  
pp. 46-56 ◽  
Author(s):  
Marzougui Salem ◽  
Radhia Souissi ◽  
Fouad Souissi ◽  
Noureddine Abbes ◽  
Jacques Moutte
Keyword(s):  
Heavy Metals ◽  
Rare Earth ◽  
Phosphoric Acid ◽  
Rare Earth Elements

Heavy metals and rare earth elements distribution in the brine fields of awe, keana and giza, central benue trough, Nigeria

2019 ◽  
Vol 157 ◽  
pp. 103514
Author(s):  
Obialo Solomon Onwuka ◽  
Nuhu Degree Umar ◽  
Olufemi Victor Omonona ◽  
Ibrahim Giza Idris
Keyword(s):  
Heavy Metals ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Benue Trough ◽  
Rare Earth Elements Distribution

Green chemistry and sustainable development: approaches to chemical footprint analysis

2018 ◽  
Vol 90 (1) ◽  
pp. 143-155 ◽  
Author(s):  
Natalia P. Tarasova ◽  
Anna S. Makarova ◽  
Stanislav F. Vinokurov ◽  
Vladimir A. Kuznetsov ◽  
Pavel I. Shlyakhov
Keyword(s):  
Heavy Metals ◽  
Sustainable Development ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Regional Scale ◽  
Small Water ◽  
Federal Districts ◽  
Footprint Analysis ◽  
Development Goals ◽  
The Impact

AbstractThe methods to monitor the distribution of chemicals in the biosphere and to estimate the impact of chemicals on the biosphere are necessary to reach Sustainable Development Goals (SDGs). The paper presents the examples of methods to measure the concentration of heavy metals (including rare earth elements) and to rank them by the level of hazard to human health on different scales. The megacity scale presents the investigation of the impact of heavy metals on the small water bodies using water contamination index (WCI); and the investigation of snow contamination to estimate the level of short-term seasonal emission of heavy metals and rare earth elements. The 2nd part of the paper presents approaches to mitigate the exposure to mercury on the regional scale: the estimation of the current concentrations of mercury in atmospheric air, natural soils, and fresh waters using UNEP/SETAC USEtox model, as well as the estimations of the variations in the concentrations of mercury for the year 2045 in the federal districts of the Russian Federation, based on representative concentration pathways (RCPs) scenario and Minamata Convention scenario.

scholarly journals Levels of heavy metals and rare earth elements in electronic waste workers in an informal waste recycling site in Ghana

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
S.A. Takyi ◽  
N. Basu ◽  
J. Arko-Mensah ◽  
K. Houessionon ◽  
P. Botwe ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Electronic Waste ◽  
Waste Recycling

scholarly journals Development of methods for the recovery оf rare-earth elements from the mineral resources of the Arctic

2021 ◽  
Author(s):  
E. P. Lokshin ◽  
◽  
O. A. Tareeva ◽  
◽  
◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Raw Materials ◽  
Mineral Resources ◽  
The Arctic ◽  
Resource Saving ◽  
Apatite Concentrate ◽  
Naturally Occurring ◽  
Wide Range ◽  
Rare Earth Mineral

This paper summarizes the findings of the research aimed at the development of a new method for the integrated processing of naturally occurring and anthropogenic rare-earth raw materials based on the decomposition of rare-earth element (REE) concentrates in the presence of sulfocationite. Sorption and desorption of REE cations on a strongly acidic ion exchanger, sorbent regeneration, and REE recovery from eluates are discussed. A virtually zero-waste integrated process for apatite concentrate is proposed. The generalization of the research findings is aimed at demonstrating the prospects and universality of the proposed resource-saving and environmentally safe approach to the processing of various types of naturally occurring and anthropogenic rare-earth mineral feeds. The new methodology made it possible to develop a number of new hydrochemical processes united by a single approach, providing a qualitative increase in the processing performance of various types of rare-earth mineral feeds. The theoretical foundations of a unified approach to the processing of a wide range of minerals can significantly accelerate and cheapen the implementation of specific process circuits, significantly reduce reagent consumption and waste generation, simplify the separation of rare earth elements and impurities, and the separation of rare earth elements from naturally occurring radionuclides, fluorine, and phosphorus. The study was funded by the Kolarctic CBC 2014-2020 program, Project KO1030 SEESIMA — Supporting Environmental Economic and Social Impacts of Mining Activity.

Sign in / Sign up

Export Citation Format

Share Document