Enhancement of low-grade scheelite ore processing efficiency

2016 ◽  
Vol 52 (1) ◽  
pp. 195-200 ◽  
Author(s):  
E. D. Shepeta ◽  
L. A. Samatova ◽  
I. V. Alushkin ◽  
V. B. Shchipchin ◽  
I. G. Korneev
Keyword(s):  
Low Grade ◽  
Processing Efficiency ◽  
Ore Processing

scholarly journals Recovery of Catapleiite and Eudialyte from Non-Magnetic Fraction of Eudialyte ore Processing of Norra Kärr Deposit

Minerals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Ivan Silin ◽  
Devrim Gürsel ◽  
Christian Büchter ◽  
Lars Weitkämper ◽  
Hermann Wotruba
Keyword(s):  
Magnetic Separation ◽  
Froth Flotation ◽  
Magnetic Fraction ◽  
Low Grade ◽  
Magnetic Minerals ◽  
Potential Source ◽  
Ore Processing ◽  
Eudialyte Concentrate ◽  
Acid Esters ◽  
Alkali Feldspars

Eudialyte ores from Norra Kärr (Sweden) and Kringlerne (Greenland) are considered a potential source of rare-earth elements (REE) for the development of a sustainable REE industry outside China. Magnetic separation is successfully applicated to recover eudialyte as a magnetic fraction. In the case of the Norra Kärr deposit, up to 20% of the REE and up to 40% of the Zr are lost during mineral processing in the non-magnetic fraction. Zr and REE are associated with non-magnetic minerals such as catapleiite, low- or non-magnetic eudialyte species, and both their intergrowths. Besides zirconosilicates such as catapleiite and eudialyte, the non-magnetic fraction has valuable and already-liberated minerals such as alkali feldspars and nepheline, which should not be considered as tailings. In this investigation, a possible way to recover REE bearing zirconosilicates from the non-magnetic fraction using flotation is presented. First, a low-grade eudialyte concentrate (1.8% Zr, 0.94% REE) from ground ore was obtained using magnetic separation. The non-magnetic fraction was then treated using froth flotation, and a Zr-REE bearing product (9% Zr, 1.5% REE) was obtained as froth product. For this purpose, phosphoric acid esters were used as selective collectors for zirconosilicates at a pH between 3.5 and 4.5. The reagent regime could be proposed not only to recover Zr- and REE-bearing minerals, but also simultaneously to remove Fe, Ti, and other colored impurities from the nepheline-feldspar product and to minimize the tailings volume.

Excavations of Two Iron Processing Sites at Scabgill and Boghall, Clydesdale, 1991

1998 ◽  
Vol 21 (1) ◽  
pp. 53-60
Author(s):  
R J Strachan ◽  
J E Hamilton ◽  
I Armit ◽  
I B M Ralston
Keyword(s):  
Iron Ore ◽  
Low Grade ◽  
Iron Ores ◽  
Medieval Period ◽  
Iron Ore Processing ◽  
Ore Processing ◽  
Small Furnace ◽  
Pipeline Project ◽  
Processing Site

Summary Excavations were carried out on two sites containing traces of iron ore processing, as part of the N-W Ethylene Pipeline Project, funded by Shell Chemicals UK Ltd. The excavations at Scabgill revealed a small part of an iron ore processing site apparently dating to the later medieval period or earlier. At nearby Boghall, a small furnace was excavated, which, while not itself datable, was also used in the processing of low grade, bog iron ores.

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.

Ore processing efficiency improvements for precious metals based on process simulations

2019 ◽  
pp. 8-13 ◽  
Author(s):  
T. N. Aleksandrova ◽  
◽  
N. V. Nikolaeva ◽  
V. V. Lvov ◽  
◽  
...  
Keyword(s):  
Precious Metals ◽  
Processing Efficiency ◽  
Ore Processing ◽  
Process Simulations

Novel polymer aids for low-grade oil sand ore processing

2008 ◽  
Vol 86 (2) ◽  
pp. 168-176 ◽  
Author(s):  
Haihong Li ◽  
Jun Long ◽  
Zhenghe Xu ◽  
Jacob H. Masliyah
Keyword(s):  
Low Grade ◽  
Oil Sand ◽  
Ore Processing

scholarly journals A Study of the Feasibility of Using Ammonium Sulfate in Copper—Nickel Ore Processing

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 422
Author(s):  
Andrey A. Goryachev ◽  
Elena V. Chernousenko ◽  
Sergey S. Potapov ◽  
Nikita S. Tsvetov ◽  
Dmitriy V. Makarov
Keyword(s):  
Ammonium Sulfate ◽  
Cost Effective ◽  
Process Conditions ◽  
Low Grade ◽  
Flotation Concentrate ◽  
Copper Nickel ◽  
Ore Processing ◽  
Nickel Ores ◽  
Roasting Temperature ◽  
Pregnant Solution

The possibility of applying a combined concentration and metallurgical method for processing low-grade and refractory copper–nickel ores was considered. The resulting rougher and scavenger flotation concentrate contained 2.07% nickel and 0.881% copper at a recovery of 85.44% and 89.91%, respectively. The concentrate was then roasted with ammonium sulfate, followed by aqueous leaching of clinker to dissolve nickel and copper. The roasting temperature, the ratio of concentrate to (NH4)2SO4 in the mixture, and the temperature were varied. Based on the study findings, the following process conditions were found to be optimal: roasting temperature 400 °C, rougher concentrate to ammonium sulfate ratio 1:7, and grinding size −40 μm. A roasting temperature of 400 °C is significantly lower than the temperature applied in conventional pyrometallurgical processes. The possibility of collecting off-gases allows the reagent to be regenerated and makes the process even more cost-effective. End-to-end recovery into pregnant solution was 81.42% for nickel and 82.81% for copper. The resulting solutions can be processed by known hydrometallurgical methods.

scholarly journals IMPROVING GOLD-BEARING SULFIDE ORE PROCESSING EFFICIENCY

2017 ◽  
Vol 21 (12) ◽  
pp. 195-202
Author(s):  
Alena Bogudlova ◽  
◽  
Grigory Voiloshnikov ◽  
Tamara Matveeva ◽  
◽  
...  
Keyword(s):  
Processing Efficiency ◽  
Ore Processing ◽  
Sulfide Ore ◽  
Gold Bearing

Optimising the Integration of Terrain Referenced Navigation with INS and GPS

2005 ◽  
Vol 59 (1) ◽  
pp. 71-89 ◽  
Author(s):  
Paul D Groves ◽  
Robin J Handley ◽  
Andrew R Runnalls
Keyword(s):  
Gaussian Mixture ◽  
Gps Data ◽  
Low Grade ◽  
Radar Altimeter ◽  
Processing Efficiency ◽  
Navigation Solution ◽  
Gps Navigation ◽  
Terrain Referenced Navigation ◽  
Simulation Results ◽  
Navigation Accuracy

The benefits of integrated INS/GPS systems are well known. However, the knowledge required to jam GPS is becoming public and the hardware to achieve this is basic. When GPS data are unavailable and a low grade INS is used, navigation accuracy quickly degrades to an unacceptable level. The addition of one or more terrain referenced navigation (TRN) systems to an integrated INS/GPS navigation system enables the INS to be calibrated during GPS outages, increasing the robustness of the overall navigation solution. TRN techniques are compared and integration architectures are reviewed. For the initial studies of INS/GPS/TRN integration, radar altimeter based terrain contour navigation (TCN) with a batch processing algorithm is used in conjunction with a centralised integration filter. Four different approaches for using these TCN fixes to calibrate the INS are compared. These are a best fix method, a weighted fix method using a probabilistic data association filter (PDAF) and single and multi-hypothesis versions of the Iterative Gaussian Mixture Approximation of the Posterior (IGMAP) method. Simulation results are presented showing that the single hypothesis IGMAP technique offers the best balance between accuracy, robustness and processing efficiency.

Direct Observation of Crystalline Ordering In Naturally Graphitized Carbon Produced by Low Grade Metamorphism

1977 ◽  
Vol 35 ◽  
pp. 162-163
Author(s):  
Thomas R. McKee ◽  
Peter R. Buseck
Keyword(s):  
Crystallite Size ◽  
Sedimentary Rocks ◽  
Carbonaceous Material ◽  
Low Grade ◽  
X Ray ◽  
Graphitized Carbon ◽  
Transmission Electron ◽  
Heat Treated ◽  
Commercial Carbon ◽  
Metamorphic Zone

Sediments commonly contain organic material which appears as refractory carbonaceous material in metamorphosed sedimentary rocks. Grew and others have shown that relative carbon content, crystallite size, X-ray crystallinity and development of well-ordered graphite crystal structure of the carbonaceous material increases with increasing metamorphic grade. The graphitization process is irreversible and appears to be continous from the amorphous to the completely graphitized stage. The most dramatic chemical and crystallographic changes take place within the chlorite metamorphic zone.The detailed X-ray investigation of crystallite size and crystalline ordering is complex and can best be investigated by other means such as high resolution transmission electron microscopy (HRTEM). The natural graphitization series is similar to that for heat-treated commercial carbon blacks, which have been successfully studied by HRTEM (Ban and others).

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