Introduction. In industry, both wolframite [(Fe, Mn) WO 4] and scheelite (CaWO 4) can be used for the production of tungsten, but due to the excessive exploitation of limited wolframite resources [1], [2], scheelite has received more and more attention [3], [4].Scheelite is often coexisting with other calcium-containing gangue minerals, such as …
This paper reviews the scheelite flotation reagents, including collectors and regulators, and introduces recent research progress on the mechanisms for the …
1. Introduction. In industry, both wolframite [(Fe, Mn) WO 4] and scheelite (CaWO 4) can be used for the production of tungsten, but due to the excessive exploitation of limited wolframite resources [1], [2], scheelite has received more and more attention [3], [4].Scheelite is often coexisting with other calcium-containing gangue minerals, such as …
To date, various flotation reagents and related mechanisms have been proposed for scheelite, which have attracted considerable attention. This paper reviews the scheelite flotation reagents ...
The optimum flotation kinetics of fine wolframite in the laboratory is expressed as follows: (9) ε = 87.26 − 31.74 e − 3.446 t − 55.51 e − 0.879 t. 3.3. Flotation kinetics of fine wolframite in the dressing plant. Industrial data were obtained from Hunan Shizhuyuan dressing plant, and are presented in Table 5.
The flotation results confirmed that the addition of lead nitrate can markedly enhance the recovery of scheelite and wolframite. In the zeta potential curves obvious positive shifts were observed ...
The results demonstrated that 97.58% of wolframite was converted to scheelite in 2 h at temperature of 800 °C under the condition of calcium carbonate stoichiometric ratio of 1.3, and the ...
2.3.2 Batch flotation experiments The wolframite-scheelite mixed ore containing cassiterite was obtained from Shizhuyuan multi-metal mine in Hunan Province, China. The chemical analysis results are shown in Table 1. The flotation process is shown in Figure 3. The crudes were ground (−0.074 mm, 90%) and
According to the micro-flotation test, when the optimum pH of wolframite flotation was 7, and the dosage of AATS was 1×10 −4 mol/L, the wolframite recovery was 93%, and the of calcite was about 10% merely. When the dosage of NaOL was 2.5 times higher than that of AATS, the recovery of wolframite was low (only 57%), and calcite …
In this study, the effects and mechanisms of grinding media (CB and CIB) on the flotation behavior of scheelite were investigated through pure mineral flotation, …
The activation mechanism of Pb(II) on the flotation of wolframite was systematically investigated. Micro-flotation test results showed that Pb(II) effectively improved the flotation of wolframite in the presence of benzyl hydroxamic acid (BHA). Maximum floatability of wolframite was achieved at approximately pH 8.5.
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 …
With the depletion of easily mined and separated wolframite, scheelite has become the primary source of tungsten. Flotation is the primary technique used to enrich scheelite. However, flotation separation of scheelite from calcium-bearing gangue minerals, such as calcite and fluorite, has always been challenging due to their similar …
The effect of Fe 2+ and Mn 2+ in the flotation of fine wolframite with octyl hydroxamic acid (OHA) as a collector was studied through a series of experiments. The XPS analysis indicates that Fe 2+ and Mn 2+ species on the wolframite surface are the active sites to interact with OHA collector. However, microflotation and contact angle …
With the depletion of wolframite, scheelite has become the main source of tungsten resources worldwide. Scheelite is mainly recovered by flotation, a mineral …
Flotation of Scheelite. General practice for flotation of scheelite is in alkali circuit using either soda ash or lime for pH control. Plant practice at King Island …
In order to improve the recovery of tungsten ores containing tin minerals, anisic hydroxamic acid (p-methoxy benzohydroxanic acid, PMOB) was synthesized and introduced as novel collector in the flotation of scheelite, wolframite and cassiterite. The flotation performance and adsorption mechanism were investigated by micro/batch …
pH of the scheelite pulp and reacting with the reagents, thus influencing the expected flotation of scheelite flotation. (3) Mineral surfaces are difficult to separate because they have similar flotation behavior and identical active particles and crystal structures. 2. Inorganic depressants In the scheelite flotation process, depressants are ...
2.1. Pure Scheelite Flotation Performance. To investigate the effects of NaOl concentration on the flotation behavior of scheelite ground by CB and CIB in parallel, pure scheelite flotation experiments were conducted as a function of NaOl concentration, and the results are shown in Figure Figure1 1 a. It can be seen that when the NaOl …
Scheelite. Froth flotation. Calcium-bearing minerals. Selectivity challenges. Promising reagents. 1. Introduction. Scheelite (CaWO 4) is one of the main sources of …
Abstract. Wolframite is often associated with calcium bearing minerals, leading to low grade, while conventional anionic collectors are hard to realize their efficient flotation separation, thus the effective structural modification of cationic collectors provides a new insight into enhancing the comprehensive development of wolframite resources.
Furthermore, the [WO 4] 2-anion associates with Ca 2+, Fe 2+, and Mn 2+ cations in the solution to form scheelite (CaWO 4) and wolframite ((Fe,Mn)WO 4). Scheelite is the main tungsten-bearing mineral that has already been exploited commercially. Flotation is the primary beneficiation approach in the industry.
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 …
Owing to the depletion of wolframite, the focus of tungsten extraction has gradually shifted to scheelite. However, separating the associated minerals (e.g., apatite, fluorite, and calcite) and scheelite is challenging because their surface physicochemical properties are similar to those of scheelite. Fortunately, researchers have made …
Scheelite. Modified date: 17/06/2023. Scheelite is a calcium tungstate mineral that is commonly found in various geological environments. It is an important ore of tungsten, which is a metal known …
The flotation enrichment of fine-particle wolframite played a crucial role in production of strategic key metal tungsten. In this paper, N-[(3-hydroxyamino)-propoxy]-N-hexyl dithiocarbamate (HAHD ...
In summary, a new type of Gemini quaternary ammonium salt collector (HDDA) was designed and synthesized. It was compared with conventional collector …
1. Introduction. Tungsten, as a significant rare metal, is widely used in alloys, electronics and chemical industry due to its high temperature strength and excellent conductivity [1], [2].Wolframite, mainly compose of (Fe, Mn)WO 4, is the principle mineral for extracting tungsten which often associated with quartz (SiO 2), fluorite (CaF 2) and …
The occurrence of either scheelite (CaWO 4) or wolframite ([Fe,Mn]WO 4) in tungsten deposits is generally explained by the Ca content of the host rocks, but scheelite/wolframite ratios in granitoids-hosted tungsten deposits are highly variable, ranging from scheelite-dominated to wolframite-dominated.Wolframite is also …