In the presence of Fe 3+ /CA, the adsorbed complexes form a dense layer on calcite, but a sparse layer on scheelite. The proposed depressant system realizes the efficient flotation separation of scheelite from calcite, which has theoretical and practical significance for the efficient development and utilization of scheelite resources.
To simulate the complex composition of pulp in the actual flotation system and further evaluate the flotation performance, a flotation test of artificially mixed minerals (wolframite:quartz = 1:1; grade of WO 3 = 38.06%) was conducted, and the results are shown in Fig. 6. Under the same conditions, the collector dosage was 15 mg/L.
Pb and BHA in Pb-BHA-NaOL collector assembled by lead nitrate (Pb), benzohydroxamic acid (BHA), and sodium oleate (NaOL) with a 240:120:1 molar ratio in …
Using these data with the known thermodynamic data, the equilibrium constants for reactions of leaching of scheelite and wolframite in acidic and basic media were determined. The results show that the acid route based in relatively cheap inorganic acids is desirable for scheelite digestion, despite the diffusion problems concerned with tungstic ...
The flotation behavior of DPA was studied by micro-flotation and mixed binary mineral flotation tests, which showed that DPA has good collection ability and excellent selectivity for scheelite. Meanwhile, the interaction mechanism of DPA on the mineral surface was discussed by FTIR analysis, zeta potential test, contact angle measurement and ...
In the flotation of scheelite and wolframite benzohydroxamic acid (BHA) is widely used as collector. As well-known chelating collector, hydroxamic acids are effective ligands with metal …
Scheelite (CaWO4) and Wolframite ((Fe,Mn)WO4) are the principal minerals of tungsten, but other important minerals include ferberite (FeWO4) and huebnerite (MnWO4) will also respond to froth flotation.The high specific gravity of these minerals makes many of these ores amenable to gravity concentration methods, however, the fine dissemination of mineral in …
Scheelite and calcite was firstly separated by new depressant Poly(sodium 4-styrenesulfonate) (PSS) with NaOL system. The recovery of scheelite was 87.18 % and the recovery of calcite was 5.57 % in single flotation experiments, the recovery and grade of WO 3 was 70.53 % and 61.08 % respectively in artificial mixed ore flotation under the optimal conditions of 10 mg/L NaOL, …
This study concentrated on the adsorption features and mechanism of a novel amidoxime surfactant 3-dodecylamine propyl amidoxime (DPA) used as a new wolframite collector on wolframite and calcite surfaces.The flotation experiment showed that DPA collector has a remarkable flotation separation effect on wolframite and calcite. Additionally, the …
Critical importance of pH and collector type on the flotation … Flotation kinetics rates of lead, zinc, and iron. The pH values of 6 and 8 were selected as optimum pH for the lead and zinc flotation respectively. Lead, zinc, and iron flotation kinetic rates in the lead flotation stage at pH values of 6 and 8 were shown in Fig. 10.
Similar to the cases in NaCl–H 2 O systems, two mechanisms for scheelite replacing wolframite in CO 2 –rich fluids are identified, a single decrease in fluid pressure or simple cooling plus an …
Flotation performance of anisic hydroxamic acid as new … The micro flotation results showed that the recoveries of scheelite, wolframite and cassiterite using PMOB as collector are 97.45%, 95.77% and 90.08%, respectively, and …
This paper reviews the scheelite flotation reagents, including collectors and regulators, and introduces recent research progress on the mechanisms for the interactions …
Scheelite (CaWO 4) and wolframite ((Fe, Mn)WO 4) are the only tungsten minerals mined commercially and are mainly found in five types of deposits: skarn, vein/stockwork, porphyry, disseminated and stratabound.Gravity concentration and flotation are the beneficiation techniques most commonly applied to scheelite ore, and gravity and/or magnetic separation …
Fortunately, researchers have made substantial progress in separating the minerals of scheelite by using depressants. This study reviews the application and inhibition …
Separation of wolframite ore by froth flotation using a … The purity of wolframite and quartz is 95% and 98%, respectively. The wolframite ore from wolframite-quartz vein deposit for bench-scale flotation experiments was purchased from Tungsten Industry Co. LTD, Jiangxi Province (China). Wolframite is the main useful mineral, and quartz is ...
In order to improve the scheelite flotation with sodium oleate (NaOL), the effect of a non-ionic polyoxyethylene ether (JFC-5) on the floatability of scheelite was investigated through flotation experiments at 10 °C, compared with 60 mg/L NaOL alone, the recovery of scheelite is improved from 22% to 85% in the presence of JFC-5 with a mass ratio of 20% at pH 10. …
Scheelite and wolframite are two main tungsten-bearing ore minerals in tungsten deposits. Compared to wolframite formed mostly by NaCl–H 2 O fluids, scheelite in many but not all tungsten deposits is associated with CO 2 –bearing hydrothermal fluids, but its precipitation mechanisms from these fluids are poorly understood. The replacement of wolframite by …
The optimal pH for scheelite flotation was found to be 9–10, although it also corresponded to the optimal floatability of fluorite. Then, four different fatty acids were tested in micro-flotation on scheelite and fluorite. The short-length chain fatty acids such as myristate do not afford a good floatability of scheelite, probably
The flotation results show that Ca 2+ significantly reduces the flotation recovery of scheelite using single dodecylamine (DDA) or single sodium oleate (NaOL), whereas Ca 2+ …
In virtue of the poor hydrophobicity for wolframite, the surfactants (often called as collectors) play a significant role in enhancing surface hydrophobicity and achieving effective separation of wolframite against gangue ores, which have received comprehensive studies in recent years [7].Generally, the surfactants commonly applied in wolframite flotation include …
Co-genetic formation of scheelite- and wolframite-bearing quartz veins in the Chuankou W deposit, South China: Evidence from individual fluid inclusion and wall-rock alteration analysis ... The conceptual model proposed for the Chuankou scheelite and wolframite mineralization system can be extrapolated to other deposits in the Nanling region.
To improve the selectivity of collectors, researchers have developed chelates as collectors and corresponding tungsten flotation processes. The chelating collector exhibits …
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Scheelite flotation is a more effective method for separating and extracting tungsten concentrate. Its efficiency largely depends on the selection and configuration of …
Therefore, the collecting mechanism of GYB in scheelite flotation was analogous to that in wolframite flotation. The chemisorption of GYB followed by formation of five-membered …
Research and investigations into various approaches to improving the beneficiation efficiency of tungsten ores are reviewed in this paper, including selective flotation of scheelite from other calcium containing minerals such as calcite and fluorite using more selective reagents, very fine scheelite and wolframite flotation, optimization of ...
At present, world's reserves of tungsten are estimated to be 3 × 10 6 t [1].China, the most rich country in tungsten resources, has about 40% of the world's reserves of tungsten [2].Most of tungsten ores, particularly wolframite and scheelite of industrial interest, occur in the deposits with very low content of WO 3 (0.1–2.5%) that is not economically viable to apply …
Tungsten ore beneficiation plays a vital role in the efficient utilization of tungsten resources. Through scientific beneficiation technology, the recovery rate of tungsten ore can be greatly improved and resource waste can be reduced. Wolframite and scheelite are the main types of tungsten ores. Due to their different mineral properties, the ore beneficiation …
There are more than 20 types of tungsten that have been released in nature, but only two types of scheelite and wolframite are valuable for mining. my country's wolframite and scheelite tungsten ores are widely distributed, but their content is low and almost in various rock mines. Overall, if you want to obtain ideal tungsten concentrate, you need to achieve enrichment …
To cite this article: J. I. Martins (2014) Leaching Systems of Wolframite and Scheelite: A Thermodynamic Approach, Mineral Processing and Extractive Metallurgy Review, 35:1, 23-43, DOI: 10.1080 ...
Key: Obtain the tungsten concentrate with high recovery and high quality Process: √ In coarse grinding stage, Xinhai adds xanthophyll collector to float various sulfides first; √ In the gravity separation stage, Xinhai adopts the shaking table to get some or …