- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
- [email protected]
A process for alkaline decomposition of both scheelite and wolframite includes such steps as grinding and pressure-digestion of the two ores in NaOH solution respectively at 140-200 deg.C and under 0.3-1.1 MPa for 1-6 hr, diluting and filtering the decomposed scheelite to obtain a solution of sodium tungstate, and directly using it to decompose the …
اقرأ المزيد
This chapter describes Wolframite (abbrv. wf), as seen with optical, reflected light microscopy. After summing up compositional data, main properties and optical parameters, the presentation follows a systematic scheme to facilitate consultation and comparison with...
اقرأ المزيد
Previous studies of H-O isotopes and fluid inclusions suggested that the main ore-forming fluids forming the wolframite–quartz vein-type deposits had a magmatic source, whereas an unresolved debate is centered on whether mantle material supplemented the ore-forming fluids.
اقرأ المزيد
Lithium and rubidium extraction from zinnwaldite by alkali digestion process: Sintering mechanism and leaching kinetics ... Zinnwaldite, lithium bearing mica, is obtained as one of the byproduct during the beneficiation of wolframite ore of Degana (Rajasthan). It contains about 0.29 to 0.6% lithium, and some amounts of … Expand. 8.
اقرأ المزيد
Wolframite is the principal ore mineral of quartz-vein-type wolframite deposits (Werner et al., 1998). Presently, the physicochemical conditions for the migration and precipitation of tungsten in hydrothermal fluids remain unclear.
اقرأ المزيد
To reveal the origin of this behavior, the leaching behaviors of scheelite and wolframite in treating a mixed scheelite–wolframite concentrate by hydrochloric acid and the leaching mechanism of the two minerals were studied. The results indicated that the leaching eciency of scheelite was much higher than that of wolframite, and wolframite was
اقرأ المزيد
The ore concentrates available to some tungsten processors in the market may be low grade ores and/or the high grade ores containing large amount of critical impurities such as Mo and/or radioactive elements. ... content = 76.5%) is wolframite. Wolframite contains between 20 and 80% each of FeWO 4 and ... (or sodium …
اقرأ المزيد
A novel technology of sodium hydroxide digestion of scheelite by reactive extrusion is investigated. Alkali dosage is 2.2 times to stoichiometry, ... with the consumption of wolframite, scheelite has become a kind of major industrial raw material. ...
اقرأ المزيد
Wolframite in the W ore body (wolframite-cassiterite quartz veins) of the Tiantangshan deposit comprises two stages, i.e., Wolf I and Wolf II. ... The late Yanshanian period includes the mineralized alkali feldspar granite (136.2 ± 1.1 Ma) of the Tiantangshan deposit underlying the volcanic sequences and the syenogranites (96.4 ± 1.0 to 96.2 ...
اقرأ المزيد
This study examined an alternative technique of extracting tungsten from wolframite ore using a fusion method with ammonium phosphate salt. Current techniques use alkali salts to decompose ... solution via alkali digestion (NaOH, Na 2CO 3, etc.) at high temperature (Figure 1). The resultant sodium tungstate solution is
اقرأ المزيد
The digestion of wolframite concentrate by HCl can be expressed as Equations (3) and (5), and the digestion mechanism and kinetics have been reported in our previous studies (Chen et al., 2022). The crude tungstic acid contains 85.07% WO3 and 3.30% SiO2 as the main compositions.
اقرأ المزيد
Wolframite is defined as the principal ore mineral of tungsten, commonly found in association with tin ore in granite rocks. It is an iron manganese tungsten oxide mineral with a dark gray to brown-black color, high specific gravity, and is a key source of tungsten used in various industrial applications.
اقرأ المزيد
Lithium and rubidium extraction from zinnwaldite by alkali digestion process: Sintering mechanism and leaching kinetics ... Zinnwaldite, lithium bearing mica, is obtained as one of the byproduct during the beneficiation of wolframite ore of Degana (Rajasthan). It contains about 0.29 to 0.6% lithium, and some amounts of …
اقرأ المزيد
Ore minerals include wolframite, molybdenite, and pyrite, with minor scheelite, sphalerite, and galena. Wolframite occurs mainly as radial plate column and have a length of 2–4 cm. ... WO 4 2–, and alkali-tungstate ion pairs and the solubility of wolframite and scheelite decrease with increasing pH (Gibert et al., 1992, Wood and …
اقرأ المزيد
Autoclave-based alkali leaching is widely applied to decompose tungsten ores to produce APT and shows excellent ... Kinetics of scheelite concentrate digestion with sulfuric acid in the presence of phosphoric acid ... Sustainable and efficient extracting of tin and tungsten from wolframite-scheelite mixed ore with high tin content. J. Clean. ...
اقرأ المزيد
Extraction of tungsten from wolframite ore (Fe, Mn)WO4 was achieved using ammonium phosphate salt as flux. The supplied ore was predominantly composed of iron-rich endmember called ferberite (FeWO4) and other minor phases identified as quartz and elsmoreite. Fusion of the wolframite ore sample (ratio 1:25) yielded an unstable …
اقرأ المزيد
The separation and extration of tin and tungsten from wolframite – scheelite mixed ore with high tin content is urgently needed given the increasingly exhaustion of the high-grade tungsten ore. However, current tungsten hydrometallurgy technologies suffer from considerably drawbacks, such as low recovery of tin, high …
اقرأ المزيد
The wolframite digestion efficiency reached 99.3% in HCl solution. ... This work has the potential to develop a novel technique for tungsten extraction from wolframite concentrate bypassing the alkali leaching process. Previous article in ... Technical Study on Treating Wolframite and Wolframite-Scheelite Mixed Ore by Sulfuric-Phosphoric Mixed ...
اقرأ المزيد
The amount of alkali used in treating tungsten ore by traditional alkali digestion leaching method is about 2.4 times of the theoretical amount. For example, the WO3 content in the slag after treating wolframite(Ca > 2%) is as high as 10% in a factory[3], and that in a Cemented Carbide Factory after
اقرأ المزيد
For the treatment of wolframite ores or tungsten ores with a high impurity content, the process becomes much more complex. A pure synthetic scheelite is first produced through an alkali roasting or alkali digesting, following chemical purification …
اقرأ المزيد
