ارتباط با ما
با ما تماس بگیرید
0086-21-58386256
0086-21-58386256
A conceptual flowsheet for heap leaching of platinum group metals (PGMs) from a low-grade ore concentrate James M. Mwase 1, Jochen Petersen, J.J. Eksteen2 ... (Schouwstra and Kinloch, 2000) for this type of ore, a BM extraction process preceding the cyanide leach becomes a necessity. However the extent of BM extraction required depends on the ...
PERIODIC TABLE Planning and Design of a Process for PGM ore Dressing Platinum Group Metals • Pt Platinum • Pd Palladium • Rh Rhodium • Ir Iridium • Ru Ruthenium • Os Osmium INTRODUCTION By: A.CHANDAN. Platinum coated computer hard drive disks. Platinum-based drugs can be used to treat a number of cancers.
This process involves roasting of the PGM ore followed by acidic bromine leaching of the oxidized PGM ore. In this process, sulfuric acid is used for acidity control, …
These processes alleviate the SO2 pollution problem but require high-pressure autoclaves. The Falconbridge Matte Leach Process involves selective leaching of nickel from a Cu-Ni-PGM matte with strong HCl at atmospheric pressure. The nickel is solubilized, while the copper and PGM remain as a sulfide residue.
Mineable platinum group metal (PGM) deposits are rare and found in relatively few areas of the world. At the same time, the use of PGM is predicted to expand in green technology and energy applications, and PGMs are …
2. Ore Preparation and Assessment. Before looking at the fundamentals of gold leaching, chemical, mineralogical, and physical characterization of the subject ore should be conducted using "representative" samples, as these play an important role in the process options and engineering considerations of the flowsheet design.
However, poor concentrate PGM grades because the oxidation potentials of bismuth are superior to those were achieved because the frothing properties of AM28 resulted of tellurides. A comparison of pristine PGM ore and weathered in poor selectivity due to increased froth stability. PGM ore from the MSZ is shown in Table I.
Direct leaching of oxidic PGM ore using different acids yielded relatively low PGM extractions. Leaching in hydrochloric acid achieved extractions of 36.6% Pt and 8.8% ... which have …
The major contributors to ore variability include hydrothermal alteration, oxidation, and weathering of a pristine ore deposit. The alteration of sulphide minerals by oxidation can lead to reduced ...
Using this process, the ore of metal can be concentrated by causing a chemical reaction with a reagent which would lead to the ore being dissolved but the impurities remaining undissolved. Leaching Process Examples. An example of the leaching process would be the leaching of Al 2 O 3.2H 2 O (or bauxite) with a heated and concentrated solution ...
In cyanide leaching process, the rate of reaction rate is proposed to be controlled by a surface ... Liu H, Duyvesteyn WPC (1994) Recovery of platinum group metals from oxide …
made to improve PGM recoveries from oxidized ores, and their merits and demerits. Keywords Oxidized PGM ores Recovery Flotation Leaching Introduction Platinum Group Metals (PGMs) …
Platinum group metals (PGMs) have found a wide variety of applications in different industries due to ... declining commodity prices, and declining ore grades have collectively made the mining landscape economically challenging (KPMG, 2015). ... a leaching process for catalytic converters using acidic chloride media, which attained recoveries ...
If the consumed acid balance was recalculated according to the total amount of extracted copper, the highest efficiency was found in the experiment with preliminary bio-oxidation of ore from the Satbayev dump; H 2 …
Abstract The depletion problem of available mineral resources is outlined and the reasons for its actualization due to incomplete extraction of metals from mined ores are characterized. The authors note that the strategy of the mining industry may be the use of non-traditional technologies for the extraction of metals as part of a combination of traditional and …
Direct leach approaches to platinum group metals extraction from ores are reviewed. ... Upper Group Two (UG-2) and Platreef (Cramer, 2001). Ore grades range from 3 to 8 g/t PGM, with associated nickel and copper in the 0.1–0.2% range present mainly as sulfides (Kyriakakis, 2005). South Africa dominates the PGMs world production followed by ...
The major portion of platinum and palladium produced today from primary sources originates from the Bushveld Igneous Complex in South Africa. The most important reefs mined are the Merensky, Upper Group Two (UG-2) and Platreef (Cramer, 2001).Ore grades range …
Worldwide PGMs production as primary product and/or recovered as a by-product of base-metal mining from 1995 through 2010 (Wilburn, 2012). …
Here is the datas after dressing test we fixed for this plant. 5). Any pulp collected inside the bunds or in the emergency pond can be pumped back to the CIL or destruction circuit. ... where there are risks of cyanide solution leakage and they make it possible to collect and pump solutions back to the process. Gold ore Carbon-In-Leaching (CIL ...
PGM is similar to that of the slow floating PGM, and the unfloated PGM (Figure 2), indicating no clear "hierarchy" in mineral floatability. This is consistent with similar studies on the Lac des Iles circuit (1) Figure 2: Composition of fast-floating, slow-floating and unfloated PGM by mineral type However, largely, the PGM are finely
Ore-dressing methods fall naturally into two general subdivisions— (1) concentration methods and (2) direct-recovery methods (amalgamation and leaching or wet methods). Concentration methods are employed to remove worthless gangue material and concentrate the valuable minerals of the crude ore in a smaller bulk.
What is leaching? It is a fundamental extraction operation in hydrometallurgical processing that involves transferring a metal of interest from naturally occurring minerals into an aqueous solution. In simple words, it entails selectively dissolving precious minerals by subjecting the ore to an active chemical solution known as a leach solution.
The document summarizes the key steps in the ore dressing (mineral processing) process. It describes four main steps: 1) Comminution which involves crushing and grinding ore to reduce particle size. ... Leaching – is the process of extracting substances from a solid by dissolving them in a liquid, either in nature or through industrial ...
2. Geology. In South Africa, the PGM ore is mined in the western and eastern limb of the Bushveld Igneous Complex [].Within the Bushveld Igneous Complex, the Merensky reef, the Platreef and Upper Group 2 (UG2) reef are exploited for platinum production [1, 4, 9].Merensky and Platreef have similar chemical and mineral composition [6, 10].These reefs …
Mineral dressing (= Orebeneficiation) The first process most ores undergo after they leave the mine is mineral dressing (processing), also called ore preparation, milling, and ore dressing or ore beneficiation. Ore dressing is a process of mechanically separating the grains of ore minerals from the gangue minerals, to produce a concentrate ...
The depletion of the Merensky ore has led the South African platinum industry into largely mining and processing Upper Group Two (UG-2) ore for the extraction of Platinum Group Metals (PGMs). However, the processing of the UG-2 material is not fully amenable to the conventional pyrometallurgical route due to the high chrome content. Therefore, in this study, …
A novel sequential heap leaching process has been identified as a possible alternative to the conventional concentrate–smelt–refine route for processing Platreef ore, a platinum group metals ...
of PGM concentrates, describing the oxidation and subsequent sublimation behaviour of elements in the PGM concentrate. The BMR process has an atmospheric oxidative leach to dissolve Ni sulphides, primarily Heazlewoodite (Ni 3S 2), Millerite (NiS) and Ni alloy (Van Schalkwyk et al., 2011). Crude NiSO 4.6H 2O crystals, containing some CoSO 4 and FeSO
At bench scale, heap reactors are investigated conventionally using packed columns (Fig. 1).A sample of approximately 600 g of ore concentrate was made into slurry using deionized water in a ratio of 5:3 (solid to liquid) by mass and coated onto approximately 3.5 kg of granite pebbles before being carefully packed into the column.The feed solution containing 2 …
The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by proper sizing of the various units of equipment. The flowsheet contemplates a six to seven day leach-wash cycle with ...
