قائمة الطعام
Serpentines could be successfully depressed oy-~ium fluorosilicate- which counteracts the effect of dissolved metal ions. In acid circuit, p H/5.5, the amenability of silicates to flotation decreases and chromite floats readily. The suitability of the process for chromite ore beneficiation requires further pilot plant tests.
Meanwhile, contrary to chromite, while lower flotation recoveries were obtained . in the same grinding t ime range (0-120 sec which corresponded to 32.36-28.09% rec.), ... copper ore flotation.
Keywords: Chromite; Flotation; Modifier; Separation; Serpentine 1. Introduction The world supply and reserves of chromite or chrome ore (FeCr2O4) have been dominated mainly by South Africa and
Chromite ore processing tailings and low-grade manganese ores are typically considered waste due to their limited or negligible utility, leading to environmental and storage concerns. ... (2003) Effects of frother type and froth height on the flotation behaviour of chromite in UG2 ore. Mineral Eng 16:941–949. Article Google Scholar
Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by strong demand for ferrochrome used in ferroalloy production for making stainless steel. ... This paper describes the results of a series of physical separation, and chromite bench flotation tests that have been carried out at acidic and natural pH ...
Low-grade chromite of Muslim Bagh, Balochistan, Pakisktan was beneficiated to produce chromite concen- trate by cationic flotation using disodium n-octadecyl sulfosuccinamate as collector. Effect of various parameters such as grind size, pulp density, pH, and conditioning time on the overall grade and recovery of chromite …
ing chromium, chromite is the only one of commercial importance as an ore of chromium. Chromite is black to brownish, sometimes yellowish red in color; it has a brown streak, is translucent to opague, has a sub- metallic lustre, and is sometimes feebly magnetic. The hardness of chromite is 5*5, its specific gravity is 4.32 to 4.60, it is brittle
Lower Chromite---mineralogy and processing 239 grades now make beneficiation of much of the ore essential, gravity concentration (Heavy Medium Separation and tabling) being used with flotation [9]. Research There has been much research activity in recent years aimed at exploiting the hitherto untapped reserves of low-grade, low …
Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods. The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium….
Chromite is an important strategic mineral usually associated with other gangue minerals, mainly silicates. The selective flotation of chromite minerals of any chromite ore have some difficulties due to dissolved cations from gangue minerals. By this work, selective flotation of various chromite ores were studied to determine some of the features of …
The objective of current work is to study the effect of pH, collector concentration, type and concentration of modifiers on the flotation behaviour of …
The objective of flotation studies was to improve the overall chromite recovery by flotation of chromite in the slimes from the gravity concentration circuit. Smith showed that an ore containing serpentine as the primary gangue mineral was amenable to concentration by flotation using a cationic collector with the pH modified to below 2.5 …
The selective flotation of chromite minerals of any chromite ore have some difficulties due to dissolved cations from gangue minerals. By this work, selective flotation of …
Chromite is the predominant gangue mineral reported to the concentrate of PGE flotation of UG2 ore, which causes serious downstream processing problems, and it seeks a good PGE grade with less ...
Entrainment is widely accepted to be the dominant mechanism of chromite recovery during UG2 ore flotation, particularly in the size range below 45 μm. Show abstract. In flotation, entrainment is undesirable as it results in the recovery of hydrophilic gangue particles which reduces the concentrate grade. For UG2 ore, a South African …
Abstract. This paper proposes a new method to improve the reverse flotation performance of magnetite ore using a pulse magnetic field. Flotation tests were performed in a flotation column with six external coils, which created the pulse magnetic field. The preferred parameters of the pulse magnetic field were identified, and the results were ...
The beneficiation studies of Suresh (1981) illustrate that low-grade chromite ore of 16%–25% Cr 2 O 3 of Sitampundi area of India, cannot be upgraded by using conventional physical beneficiation techniques like gravity and flotation, due to the intimate association of iron in the lattice of chromite particle. However, they have demonstrated ...
Different chromite ores from South Africa were made flotation using the anionic collector, A825 (petroleum sulfonate), after conditioning with H2SO4 at low pH …
The main economic PGE-bearing ore bodies within the Bushveld Complex mined today are the Merensky Reef, the UG-2 chromitite, and the Platreef. ... The processing plants of Sylvania Platinum Ltd. make use of gravity separation and flotation to recover both the chromite and PGE-rich fractions. Comminution and liberation of …
Identical flotation tests were done on samples of Benbow-3 ore containing 30.2 percent Cr2O3 using H2SO4 or HCl as pH modifier. The samples were ground to 100 percent minus 100 mesh, deslimed at a 30-micrometer particle size, and floated with 0.6 pound Armac C per ton of ore. … See more
However, especially, Na-Oleate flotation of a chromite ore containing serpentine instead of olivine is very difficult because both minerals exhibit almost similar surface properties with chromite ...
Keywords: Chromite; Flotation; Modifier; Separation; Serpentine 1. Introduction The world supply and reserves of chromite or chrome ore (FeCr2O4) have been dominated mainly …
Effect of particle shape properties on selective separation of chromite from serpentine by flotation. : Although many studies have been conducted on the …
It is well-known that flotation of chromite and serpentine is very difficult, especially in oleate flotation, due to similar surface properties of both minerals and to the ions such as Mg 2+ deriving from the ore and depressing the adsorption of RCOO − ions on the chromite surface [5]. Modifying agents may be used to increase selectivity.
In the UG2 ore (Bushveld Complex, South Africa) flotation, normally more than 3% of the gangue minerals, principally chromite with talc and pyroxene, report to the concentrate diluting the PGM ...
Abstract. The recovery of chromite from the tailings streams of South African UG2 platinum concentrators adds significant financial returns to these operations. Whilst the coarser fractions are amenable to processing by physical separation, the focus is now also on the recovery of fine (typically −75 µm) chromite by flotation.
Chromite reacts with sodium hydroxide and oxygen forming water soluble sodium chromate (Parirenyatwa et al., 2016). (70) FeCr 2 O 4 + 4 N a O H + 1.75 O 2 → 0.5 Fe 2 O 3 + 2 Na 2 CrO 4 + 2 H 2 O (g) (71) MgCr 2 O 4 + 4 N a O H + 1.5 O 2 → M g O + 2 Na 2 CrO 4 + 2 H 2 O (g) Other spinel phases in the ore will react with sodium hydroxide …
The large portion of chromite in the ore introduces additional challenges to both the comminution and flotation circuits. The comminution challenge is due to the high density of the chromite (SG ∼ 5) relative to the silicates (SG ∼ 2.6–3) in the ore which leads to inefficiencies in classification, causing a high circulating load of fine ...
The US Bureau of Mines compared column flotation using either fine or coarse bubbles with conventional flotation on a Montana chromite ore. On deslimed ore, fine-bubble column flotation produced a 44.7% Cr2O3-grade rougher concentrate with 87% recovery, compared with 43.8% and 43.5% Cr2O3-grade rougher concentrates with 85% and 77% …
The maximum of 83% recovery of chromite is possible with 22 to 23% Cr 2 O 3 content and thus obtained FDS underflow is suitable for flotation circuit. A low teeter water flow rate with a high bed ...
حقوق النشر ©2000- 2024 شركة شنغهاي زينيث
