2022.10.6 Ammonium Fluorides in Mineral Processing Alexander Dyachenko Abstract The possibility of using ammonium fluoride as a new reagent for processing mineral raw materials is considered. Ammonium fluorides are the most convenient and
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Fluoride Minerals. Fluoride minerals: fluocerite, yttrian fluorite, tveitite(Y), gagarinite, and so on. From: Hydrometallurgy of Rare Earths, 2018. Related terms: Apatite; Europium;
Read More2021.12.1 The high-fluoride mine waters are all associated with Na–type, with a remarkable cation composition feature of higher Na + and lower Ca 2+ and Mg 2+
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2021.4.1 High-grade fluorite is the primary source of hydrofluoric acid. Due to the increasing demand flotation, the central processing technique to obtain high-grade
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2020.12.1 Process sequence of ammonium difluoride based processing of Ta and Nb mineral resources. The main advantage of using ammonium bifluoride is that the HF is
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2023.1.6 149 Accesses Metrics Abstract 3D modeling was undertaken to establish the morphology, volume, and spatial distribution of the fluorite orebody, and ore grade of
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2020.3.9 Metrics Abstract Fluoride is ubiquitously present throughout the world. It is released from minerals, magmatic gas, and industrial processing, and travels in the
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2021.7.7 However, this study proves that fluoride decreases with depth and the elevated fluoride in the groundwater is caused by smectite-kaolinite clay, muscovite and
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2023.5.1 Thus, the froth-floatation method can be an effective alternative remediation process when fluoride originates from minerals in the soil since acid washing or
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2014.7.9 Fluorine is in the dynamic balance of two geochemical processes, enrichment and leaching, reflecting the adsorption and desorption of fluoride by clay
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2019.8.28 Fluoride technologies are one of the most promising ways to process mineral raw materials (Dyachenko and Kraidenko 2007; Medkov et al. 2011). The purpose of the research – to assess the prospects for the use of fluorination to desilicate off-grade aluminum raw materials (bauxite, allite, kaolinite clays), which are widespread in the Komi ...
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2018.12.1 Fluoride is an essential component in the mineralization of bones and in the formation of dental enamel. Excessive intake may result, however, in teeth mottling and dental and skeletal fluorosis. With an average fluoride concentration of ~2.4 mg L−1 in Tunisian drinking water, the present study focused on promoting low-cost materials for
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2021.4.1 In mineral processing plants, the fatty acid is often modified by emulsification, halogenation, sulfonation, sulfate, and addition of nitrogen atoms to obtain amphoteric collectors. Gao et al. [ 55 ] developed a reagent scheme for separation of calcite and fluorite, i.e., citric acid (CA) as a depressant, sodium fluoride (NAF) as a regulator ...
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2017.4.25 The present review bestows a detailed discussion on natural mineral as adsorbent used in defluoridation process with special emphasis on soil and low-cost clay minerals. Being the most reactive of all chemical elements and the lightest member of halogen group, fluorine is found in the environment as fluoride.
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2017.9.1 In contrast, the COOL process (CO2 Leaching process) is a process that makes use of water and carbon dioxide to leach lithium from any silicate mineral, making geopolymers from the residues.
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2020.12.10 The way to successfully upgrade a phosphate ore is based on the full understanding of its mineralogy, minerals surface properties, minerals distribution and liberation. The conception of a treatment process consists of choosing the proper operations with an adequate succession depending on the ore properties. Usually, froth flotation
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2017.9.1 However, other novel methods including direct processing of natural spodumene and the process that favours the direct production of LiOH will be the trends of future research. Fluoride-based methods can achieve low energy consumption and high extraction efficiency but still need to be further investigated for a sustainable, economical
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2022.10.3 Today the mineral form of calcium fluoride (CaF 2) is better known as fluorite, though fluorspar remains common in mining and industry. Weardale fluorite fluorescing under long-wave ultraviolet light.
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2019.5.14 Consequently, the loess aquifer presents a spatially heterogeneous structure and the water–rock interaction is a slow, yet complex process that could have significant influence on dissolution of fluoride minerals [29,30,31]. In this study, we found that domestic drinking water was largely derived from both public and private supply wells.
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2021.4.29 These fluoride minerals are nearly insoluble in water. Hence, ... After 1 h 30 min, the fluoride removal process is repeated. 5. Conclusions. After the research, it was found that the optimum dose of iron sludge for fluoride removal, with an initial concentration of 3 mg/L, should be 30 g/L and the contact time should be 30 min; in such a case ...
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2019.3.20 Double leached Waelz oxide (DLWO), with 76% zinc, is a secondary zinc containing raw materials obtained by the treatment of electric arc furnace dust. The content of fluoride in DLWO is still too high for
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2017.12.24 In this paper, we study the possibility of obtaining iron and titanium-vanadium concentrates with highest contents of iron and titanium, respectively, through hydrometallurgical processing of the
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The naturally occurring fluoride minerals such as fluorspar (CaF 2), fluorapatite [3Ca 3 (PO 4) 2 Ca(FCl 2)], cryolite (Na 3 AlF 6) and sellaite (MgF 2) are nearly insoluble in water. ... During the HTL process, PFAS are expected to degrade through OH-catalyzed series of nucleophilic substitution and decarboxylation reactions.
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2022.10.13 Rapid industrialization is deteriorating water quality, and fluoride pollution in water is one of the most serious environmental pollution problems. Adsorption technology is an efficient and selective process for removing fluoride from aqueous solutions using adsorbents. Metal-based adsorbents synergize the advantages of fast adsorption, high
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2018.12.7 Groundwater is the most important source of drinking water. Fluoride was found in high concentrations in the groundwater from deep wells of the water supply in the southern main Ethiopian rift. The high concentration of fluoride is dominantly geogenic rather than anthropogenic in origin, as the agricultural area was not found to be contaminated
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Hazards of minerals—rocks and sustainable development. S.K. Haldar, in Introduction to Mineralogy and Petrology (Second Edition), 2020 11.3.12 Fluorite. The fluorite or fluorspar is a halide mineral (Figs. 1.15 and 1.16 Figure 1.15 Figure 1.16) and composed of calcium fluoride (CaF 2).The fluorite often occurs as veins with metallic minerals. The fluorite is
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2021.12.1 1. Introduction. Groundwater is the most abundant and readily available source of global freshwater supply and will continue to be the most valuable resource over several decades to come [1], [2].Fluoride is an important globally recognized contaminant in drinking water [3].Fluoride occurs in the environment due to the presence of fluoride
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2018.11.14 The high availability of fluoride in surface and groundwater in the East African Rift Valley was documented during the colonial period. Since the early 1960s, many studies have been conducted to solve the fluorosis crisis in this region. At present, no cost-effective solution to mitigate fluoride contamination is available for the large majority of
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2020.11.2 Three main sources of fluoride in groundwater exist, namely, fluoride in the (1) atmosphere, (2) endogenous groundwater and (3) rocks and soils [ ]. Although rainwater F − concentrations in the study area range from 0.2 mgL −1 to 0.4 mgL −1, there are no active volcanoes in the study area and surrounding areas.
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