Extracting tungsten from scheelite concentrate with …
A technology has been developed for extracting tungsten from scheelite concentrate with caustic soda by an autoclaving process. In this process, the effects of different variables on the digestion of scheelite, and on the evaporation of the crude sodium tungstate leach solution, has been investigated.The results showed that 98.8% W was leached in 2 h at 160 °C under …
(PDF) Scheelite Dissolution in HCl-Alcohol Solutions at 70°C
The aim of this study is to investigate the utility of adding chelating agent during hydrochloric acid leaching of low-grade scheelite concentrates, obtained from Uludağ, Bursa (Türkiye). ... an acid leaching route was adopted for the extraction of pure tungsten from a Nigerian scheelite ore consisting primarily of scheelite (Ca 4.00 W 4.00 O ...
Current Status and Prospects of China's Tungsten …
After leaching tungsten ore, a crude sodium tungstate solution is obtained. ... due to the use of hydrochloric acid leaching, part of the molybdenum entered the solution in soluble form during the process, and the tungsten precipitated in the form of tungstic acid, so the molybdenum was removed. The problem is not outstanding. However, with the ...
Recovery of tungsten from acidic solutions rich in calcium …
A new process for leaching scheelite ore consists of leaching low- and high-grade concentrates with H2SO4 in the presence of H3PO4 and NaCl at atmospheric pressure.
The extraction of tin (Sn) from primary tin ore deposits using …
[1] Lehmann B 2020 Formation of tin ore deposits: A reassessment Lithos 105756 Google Scholar [2] Jun W., Yun P. and Lee E. 2004 Leaching behavior of tin from Sn–Fe alloys in sodium hydroxide solutions Hydrometallurgy 73 71-80 Google Scholar [3] Kim S, Lee J and Yoo K 2016 Leaching of tin from waste Pb-free solder in hydrochloric acid solution with stannic …
Tungsten extraction from scheelite hydrochloric acid …
To reduce the amount of ammonia wastewater produced during traditional tungsten metallurgy, a novel method has been developed. Hydrogen peroxide was first used to …
Low-Energy Feasibility for Leaching an Indigenous Scheelite …
In this study, an acid leaching route was adopted for the extraction of pure tungsten from a Nigerian scheelite ore consisting primarily of scheelite (Ca 4.00 W 4.00 O 16.00: 96 …
Low-Energy Feasibility for Leaching an Indigenous Scheelite Ore …
In this study, an acid leaching route was adopted for the extraction of pure tungsten from a Nigerian scheelite ore consisting primarily of scheelite (Ca4.00W4.00O16.00: 96-900-9627) and quartz (Si6.00O6.00: 96-900-5019). At optimal leaching conditions (2.5 mol/L HCl, 70 °C, < 75 µm), 88.5% of the initial 10 g/L ore reacted within 120 min ...
Leaching Systems of Wolframite and Scheelite: A
3) Siliceous HCl Leaching Fusion with Na 2CO 3 Scheelite (65% WO 3) Carbonated Na 2CO 3 Fusion Leaching with NaOH Scheelitic and=or wolframitic complexes ores (5–20% WO 3) Indifferent Na 2CO 3 ...
Leaching of heavy metals from tungsten mining tailings: A case study based on static and kinetic leaching tests☆
In the present paper, we demonstrate how to successfully circumvent the formation of solid reaction products in the leachate by dissolving scheelite, CaWO 4, in 37.0 wt % aqueous HCl–ethylene glycol mixtures and …
Leaching Behavior and Mechanism of Scheelite and …
Acid leaching is considered an appropriate method for the tungsten concentrate treatment. However, it is difficult to leach wolframite efficiently. 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 …
Tungsten extractive metallurgy: A review of processes and …
Roasting tungsten ore with Na 2 CO 3, then dissolving in water, following treatment by HCl: H 2 WO 4: 1847: Na 2 CO 3 or/and NaOH leaching: With or without pretreating by roasting, boiling the slurry of tungsten ore in Na 2 CO 3 and NaOH solutions or using an autoclave at high pressures, then treating the obtained solution or tungstate ...
(PDF) Solvometallurgical Process for the Recovery of Tungsten …
After the dissolution of tungsten, nonaqueous solvent extraction was used to separate tungsten from calcium, by means of a solvent consisting of 20 vol % Aliquat 336 in the aliphatic diluent GS190 ...
Efficient leaching of scheelite in sulfuric acid and hydrogen …
With the increased mining and use of wolframite in recent years, resources containing refined tungsten ore are facing a gradual reduction (Henckens et al., 2018). ... hydrogen peroxide is a promising complexing agent. In fact, it has been previously shown that leaching of scheelite in hydrochloric acid solution containing hydrogen peroxide as a ...
Acidic leaching of scheelite concentrate and production of …
The aim of this study is to investigate the utility of adding chelating agent during hydrochloric acid leaching of low-grade scheelite concentrates, obtained from Uludağ, Bursa (Türkiye). Examined parameters were as follows; leaching conditions,
Recovery of tungsten from acidic solutions rich in calcium …
An in-depth investigation on HCl atmospheric leaching showed that >95% of Fe, Ni, Co, V, and Mo, 76.9% of W, and 89.3% of P were extracted efficiently and SiO2 was enriched into the leach residue ...
Green leaching of tungsten from synthetic scheelite with sulfuric …
Synthetic scheelite are considered as an important source of tungsten. In this study, an environment-friendly medium, H 2 SO 4-H 2 O 2 solution, was used to decompose synthetic scheelite. In the leaching process, tungsten was completely dissolved in peroxytungstic acid and separated from the insoluble CaSO 4 ·nH 2 O. The solution containing tungsten was …
Study on leaching behaviour of tungstates in acid solution containing
Herein, an integrated technology for arsenic removal and tungsten extraction based on the formation and decomposition of arsenotungstic acid is proposed. By leaching scheelite with H 3 AsO 4-H 2 SO 4 solution, arsenotungstic acid was formed with a tungsten leaching rate of 99.9 %. The arsenic content in the resulting gypsum was 0.003 wt%, which ...
Understanding the wet decomposition processes of tungsten ore…
DOI: 10.1016/j.hydromet.2022.105928 Corpus ID: 249715278; Understanding the wet decomposition processes of tungsten ore: Phase, thermodynamics and kinetics @article{Lei2022UnderstandingTW, title={Understanding the wet decomposition processes of tungsten ore: Phase, thermodynamics and kinetics}, author={Yuntao Lei and Fenglong Sun …
Comprehensive treatments of tungsten slags in China: A …
Both hydrochloric acid and sulfuric acid can be used as a solvent to leach Sc 2 O 3, but there are some disadvantages associated with using ... Liang et al. (2006) extracted most of the W through the same process as used for tungsten ore; leaching by soda under high pressure. Using this method, the content of impurities in the slag can be ...
Solvometallurgical Process for the Recovery of Tungsten …
In the present paper, we demonstrate how to successfully circumvent the formation of solid reaction products in the leachate by dissolving scheelite, CaWO4, in 37.0 wt % …
The Use of Acid Leaching to Recover Metals from …
Existing research has demonstrated the feasibility of recovering target metals—i.e., copper, iron, manganese, cobalt, zinc, and others—through the application of acid leaching techniques with consistently high yields and …
Low-Energy Feasibility for Leaching an Indigenous Scheelite Ore …
The aim of this study is to investigate the utility of adding chelating agent during hydrochloric acid leaching of low-grade scheelite concentrates, obtained from Uludağ, Bursa (Türkiye). ... demands or be tedious to obtain in the nearest future [1, 2]. In recent years, the continuous decline of high-grade tungsten ore deposits especially the ...
Study on leaching behaviour of tungstates in acid solution containing
This means that the emission of sodium chloride should be proportional to the amount of tungsten ore processed. If acid is used to decompose tungsten minerals, ... Leaching of scheelite by hydrochloric acid in the presence of phosphate. Hydrometallurgy, 16 (1) (1986), pp. 27-40. View PDF View article View in Scopus Google Scholar.
Understanding the wet decomposition processes of tungsten ore…
This review aims to understand the wet decomposition processes of tungsten ore from the novel perspective of phase separation. Tungsten ore is denoted by the general formula MWO 4, where M = Ca means scheelite CaWO 4 and M = Fe/Mn means wolframite (Fe,Mn)WO 4.During decomposition, W(VI) either enters into the liquid phase (leach liquor) as a soluble W …
The dissolution behavior of different forms of tungstic …
Sulfuric acid is difficult to volatilize due to its high boiling point and may be used to leach tungsten ore. Thermodynamic calculations have shown that the sulfuric acid decomposition of scheelite shows promise (Shen et al., 2018a).In contrast to the decomposition of hydrochloric acid, tungsten is converted into solid tungstic acid when tungsten ores are leached with …
Efficient recovery of tungsten from scheelite concentrates …
where m 1 is the mass of the ore (g), w 1 is the mass fraction of tungsten in the ore, c 1 is the concentration of tungsten in the leachate (g·L −1), and ν 1 is the volume of leachate (L). After leaching, the tungsten in the leach solution was extracted and transformed into ammonium tungstate by an ion-exchange method.
Experimental study on alkaline pressure leaching of tungsten …
This article adopted the pressurized alkaline leaching method to leach tungsten from tungsten-tin ore. Mixed tungsten-tin ore with NaOH and place it in a 2L pressure vessel under experimental conditions: NaOH addition 300g/L, temperature 150 ℃, L/S ratio 2:1, particle size<0.075mm, time 180 minutes, tungsten leaching rate of 95.53%, tungsten content in …
A Review of Tungsten Resources and Potential …
Enhanced gravity separation, wet high-intensity magnetic separation, and flotation have been reported to be successful in reprocessing tungsten tailings, while bioleaching can assist with removing some toxic …
Leaching of synthetic scheelite by hydrochloric acid …
It is known that tungsten can be extracted from hydrochloric acid leaching of scheelite with a reaction constant about 10 4 at 293 K. 4 This was expected to be a fast reaction in thermodynamics ...