scholarly journals The Beneficiation Processes of Low-Grade Sedimentary Phosphates of Tozeur-Nefta Deposit (Gafsa-Metlaoui Basin: South of Tunisia)

Minerals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 2 ◽  
Author(s):  
Haïfa Boujlel ◽  
Ghassen Daldoul ◽  
Haïfa Tlil ◽  
Radhia Souissi ◽  
Noureddine Chebbi ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Microscopic Observation ◽  
Recovery Rate ◽  
Coarse Fraction ◽  
Low Grade ◽  
Reverse Flotation ◽  
Chemical Analyses ◽  
Phosphate Ore ◽  
Carbonate Fluorapatite

The enrichment of the low-grade-phosphate ore of the Tozeur-Nefta deposit was investigated using scrubbing-attrition, ball grinding and anionic/cationic reverse flotation in order to separate phosphate-rich particles from their gangue. The choice of the beneficiation process was based on the petrographic, mineralogical and chemical analyses. The petrographic and mineralogical studies have revealed the abundance of phosphatic (carbonate-fluorapatite-CFA) particles) coupled with carbonates (calcite, dolomite,) and silicates (quartz, illite, kaolonite) that constitute the (endo/exo) gangue of these ores. Chemical analysis has demonstrated that the raw phosphate sample contains low amounts of P2O5 (12.0%) and MgO (4.9%) and high amounts of CaO (40.7%) and SiO2 (20.5%). Microscopic observation/counting has shown that the release mesh occurs in the 71–315 μm size. Scrubbing-attrition, grinding and reverse flotation methods were applied to the +71μm fraction. Scrubbing-attrition tests of the 71–315 μm fraction have helped to improve the P2O5 grade to 15.5%. Ball-grinding tests were used to reduce the coarse fraction +315 μm. Grounded materials were sieved to 71–315 μm and combined with the scrubbed fraction in the flotation feed. Reverse-flotation tests of the phosphate-rich fraction (71–315 μm) have helped to improve the P2O5 grade to 27.1%, with a recovery rate of 92.4%.

scholarly journals Increasing the efficiency of phosphate ore processing using flotation method

2021 ◽  
Vol 248 ◽  
pp. 260-271
Author(s):  
Tatyana Aleksandrova ◽  
Abdalla Elbendari
Keyword(s):  
Sodium Tripolyphosphate ◽  
Low Grade ◽  
Reverse Flotation ◽  
Technological Parameters ◽  
Tall Oil ◽  
Valuable Component ◽  
Phosphate Ore ◽  
Ore Processing ◽  
Flotation Method ◽  
Tall Oil Fatty Acids

The paper presents flotation of two phosphate ore samples of different origin. Statistical analysis was used to study the effect of operating parameters on flotation efficiency. The paper proposes to increase the efficiency of flotation processing of magmatic phosphate ore with a low grade of the valuable component (P2O5 = 10.88 %), containing nepheline and feldspars, by means of direct anionic flotation. Authors present an optimization of anionic flotation using tall oil fatty acids mixed with anionic phospholane as an anionic collector. The effect of adding soda ash to compensate for the influence of calcium cations on technological parameters of P2O5 flotation was examined. The results of studying the flotation of nepheline ore (flotation tailings of magmatic phosphate ore) showed that replacement of phospholane with oxyethylated isotridecanol allowed to obtain a high-quality concentrate. It was estimated that with the addition of Na2CO3 in the amount of 2,000 g/t, a concentrate was obtained with the grade and recovery of phosphorus pentoxide equal to 39.15 and 94.19 %, respectively. The paper proposes to increase the efficiency of flotation processing of sedimentary phosphate ore with a low grade of the valuable component (P2O5 = 22.5 %), containing gypsum and quartz, by means of desliming followed by anionic or cationic reverse flotation. Tall oil fatty acid with anionic phospholane was used as a collector in anionic reverse flotation, and amine was used in cationic reverse flotation. Sodium tripolyphosphate was used as a P2O5 depressant. It was found to be an effective depressant in both anionic and cationic flotation. When analyzing the statistical plan, it was estimated that the maximum grade of the valuable component in the concentrate (P2O5 = 31.23 %) and the recovery to concentrate of 95.22 % were obtained in the chamber product at amine consumption of 950.88 g/t and sodium tripolyphosphate consumption of 500 g/t.

scholarly journals Geochemical Assessment and Mobility of Undesired Elements in the Sludge of the Phosphate Industry of Gafsa-Metlaoui Basin, (Southern Tunisia)

2021 ◽  
Vol 11 (3) ◽  
pp. 1075
Author(s):  
Olfa Smida ◽  
Radhia Souissi ◽  
Marzougui Salem ◽  
Fouad Souissi
Keyword(s):  
Rare Earth ◽  
Water Resources ◽  
Chemical Analysis ◽  
Leaching Tests ◽  
Mineralogical Analysis ◽  
P2o5 Content ◽  
Phosphate Industry ◽  
Carbonate Fluorapatite ◽  
Enrichment Process ◽  
Geochemical Assessment

The raw phosphates in the Gafsa-Metlaoui phosphate basin are valorized by wet processes that are performed in the laundries of the Gafsa Phosphates Company (CPG, Gafsa, Tunisia) to reach market grades (>28% P2O5). This enrichment process allows the increase of P2O5 content by the elimination of the coarse (>2 mm) and fine (<71 µm) fractions. Mineralogical analysis has shown that all the investigated materials (raw phosphate, marketable phosphate, coarse waste, and fine waste) from the laundries of M’Dhilla-Zone L and Redeyef are both composed of carbonate fluorapatite, carbonates, quartz, gypsum, clays, and clinoptilolite. Chemical analysis shows that Cr, Cd, Zn, Pb, and U are concentrated in the fine wastes and associated with the clay–phosphate fraction. The rare earth elements are more concentrated in both raw and marketable phosphates. Drilling and sludge-water analysis, along with leaching tests conducted on the fine wastes, showed that, due to phosphate industry, cadmium, fluorine, and sulfate contributing to the pollution of water resources in the region, pollution is more conspicuous at M’Dhilla.

Influence of surface dissolution on reagents’ adsorption on low-grade phosphate ore and its flotation selectivity

2021 ◽  
Vol 631 ◽  
pp. 127700
Author(s):  
Imane Aarab ◽  
Mohammed Derqaoui ◽  
Khalid El Amari ◽  
Abdelrani Yaacoubi ◽  
Abdelmoughit Abidi ◽  
...  
Keyword(s):  
Low Grade ◽  
Phosphate Ore

Study on the Concentration of a Carbon-Containing Oolitic Low-Grade Collophane

2014 ◽  
Vol 900 ◽  
pp. 681-684
Author(s):  
Wan Chao Jin ◽  
Ping Zhou ◽  
Hai Yun Xie ◽  
Wei Tan ◽  
Bo Wen Yang
Keyword(s):  
Low Grade ◽  
Reverse Flotation ◽  
Valuable Component

Apatite is a valuable component of the collophane taken from Yunnan, as it is in the shape of oolith and contains a lot of carbon, and hence an effective benefication of the apatite is difficult to be occurred by means of concentration. Based on the results of both direct and reverse flotation tests, it shows that reverse flotation is effective in the benefication of the apatite to a certain extent. When reverse flotation is employed to treat the run-of-mine at a grade of 18.77%, the concentrate containing P2O5 24.04% at a recovery of 62.58% can be produced.

Droplet microfluidics in (bio)chemical analysis

The Analyst ◽  
2015 ◽  
Vol 140 (1) ◽  
pp. 22-38 ◽  
Author(s):  
Evgenia Yu Basova ◽  
Frantisek Foret
Keyword(s):  
Chemical Analysis ◽  
Droplet Microfluidics ◽  
Chemical Analyses

Droplet microfluidics may soon change the paradigm of performing chemical analyses and related instrumentation.

‘We must send you a sample’—a Persian–European dialogue: insights into late nineteenth-century ceramic technology based on chemical analysis of tiles from the Ettehadieh house complex, Tehran, Iran

2020 ◽  
Author(s):  
Moujan Matin ◽  
Mohammad Gholamnejad ◽  
Ali Nemati Abkenar
Keyword(s):  
Nineteenth Century ◽  
Chemical Analysis ◽  
Production Technology ◽  
Chemical Study ◽  
Ceramic Technology ◽  
Late Nineteenth Century ◽  
Chemical Analyses ◽  
Technological Information ◽  
Late Nineteenth ◽  
First Time

This paper focuses on the production technology of late nineteenth-century tiles from the Ettehadieh House Complex in Tehran, Iran. It makes use of the opportunity to provide for the first time the results of chemical and microstructural analyses of late nineteenth-century tiles selected directly from context and with known provenance. The paper integrates the results of chemical study of the Ettehadieh tiles with other available technological information on nineteenth-century Persian tiles, including chemical analyses of signed tiles and samples of pigments, as well as the study of the treatise of a certain Persian potter, ‘Ali Mohammad Isfahani, to suggest processes of materials procurement and manufacture. These processes are used as evidence to discuss trade and technological interactions between Iran and Europe in the nineteenth century.

Sulfur Content Reduction and Iron Grade Improvement of V-Ti Magnetite Concentrate by Combining Reverse Flotation and Magnetic Separation

2012 ◽  
Vol 524-527 ◽  
pp. 1115-1123 ◽  
Author(s):  
Jiu Shuai Deng ◽  
Shu Ming Wen ◽  
Shao Jun Bai ◽  
Mei Fang Xie ◽  
Hai Ying Shen
Keyword(s):  
Magnetic Separation ◽  
Sulfur Content ◽  
Ph Value ◽  
Mineral Resources ◽  
Open Circuit ◽  
Low Grade ◽  
Reverse Flotation ◽  
Magnetic Intensity ◽  
Magnetite Concentrate ◽  
Iron Grade

For low-grade iron ore, smelting costs and resource wastage will be increased. Product quality of such ore is affected adversely by an excessive amount of sulfur. This also causes environmental pollution. In accordance with the vanadium-titanium (V-Ti) magnetite concentrate properties with low iron grade and high sulfur content, the joint process of magnetic separation and flotation was carried out. Magnetic separation was conducted to increase the iron grade, while reverse flotation was used to reduce sulfur content. Results show that the feeding mainly contains titanomagnetite, hematite, and pyrite. The sulfur was primarily found in pyrite. The separation effect was influenced by the grinding fineness, magnetic intensity, collector type and dosage, and pH value. At a grinding fineness of −45 μm accounting for 87%, most of the iron minerals exhibited monomer dissociation. An open-circuit experiment was carried out under the best conditions of magnetic intensity, as well as collector and modifier dosage. Good experimental results were obtained as follows: the iron grade increased to 57.17%, iron recovery was 89.94%, sulfur content decreased from 0.66% to 0.26%, reverse flotation of sulfur foam concentrate contained almost 15.68% sulfur, the upgrade ratio was about 23, and the cobalt in the sulfur concentrate was enriched 20-fold. A method for improving the comprehensive utilization level and effect of mineral resources is provided in this study.

Octahedral occupancy and the chemical composition of diagenetic (low-temperature) chlorites

Clay Minerals ◽  
1991 ◽  
Vol 26 (2) ◽  
pp. 149-168 ◽  
Author(s):  
S. Hillier ◽  
B. Velde
Keyword(s):  
Chemical Composition ◽  
Low Temperature ◽  
Bulk Composition ◽  
Compositional Variation ◽  
Low Grade ◽  
Chemical Analyses ◽  
Method Of Calculation ◽  
Sedimentary Sequences ◽  
Wet Chemical ◽  
Potential Use

AbstractThe chemical composition of about 500 diagenetic chlorites, determined by electron microprobe, has been studied in six different sedimentary sequences spanning conditions from early diagenesis to low-grade metamorphism, in the temperature range 40–330°C. The range of Fe/(Fe + Mg) is almost complete and is positively correlated with Al. Five sequences show the same compositional variation. In each, the most siliceous chlorites have the lowest R2+, substantially more octahedral than tetrahedral Al, and the lowest octahedral totals. Conversely, the least siliceous have the highest R2+, nearly equal octahedral and tetrahedral Al, and octahedral totals close to that for an ideal trioctahedral mineral. A dioctahedral substitution Si[]R2−2 (where [] represents a vacant octahedral site) which decreases with temperature, describes this variation. Low octahedral totals are, however, induced by the method of calculation and need not indicate vacancies; for published wet chemical analyses of metamorphic chlorites they may simply indicate oxidation of Fe. Intergrown dioctahedral phyllosilicates may partly account for apparent vacancies in diagenetic chlorites. Nevertheless, the correlation of composition with temperature and similarities to the temperature-related evolution of synthetic chlorites, suggest that diagenetic chlorites are compositionally distinct from, but metastable with respect to, fully trioctahedral metamorphic chlorites. Temperature-related trends are modified by bulk composition, complicating their potential use for low-temperature geothermometry.

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