Scheelite (CaWO 4) is mainly collected through froth flotation.It has significant applications in the manufacturing of alloys and steels. To better understand bubble-scheelite attachment mechanisms, we probed the interaction force between a bubble and a scheelite surface using an atomic force microscope (AFM) and …
Tungsten Deposits, Resources, and Supply. Several tungsten minerals have been reported in the literature, but only scheelite (CaWO 4) and wolframite [(Fe,Mn)WO 4] are of economic importance and nowadays exploited for primary tungsten extraction (Pitfield et al., 2011; Audion and Labbé, 2012; Schmidt, 2012a,b; Yang, 2018).Wolframite is a …
The occurrence of either scheelite (CaWO4) or wolframite ([Fe,Mn]WO4) in tungsten deposits is generally explained by the Ca content of the host rocks, but scheelite/wolframite ratios in granitoids ...
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 …
Thus, the present review article also collates the surface properties and various reagent systems developed towards enhancing the flotation selectivity of scheelite particles. Further, the present communication critically reviews the flotation separation of the wolframite mineral system for the first time.
GYB and SS, which are widely adopted in wolframite flotation systems, were used as the collector and depressant in this study, respectively. ... 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 ring chelate …
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 ...
The activation of scheelite and wolframite by lead nitrate with benzohydroxamic acid (BHA) as collector was investigated by means of micro flotation test, zeta potential measurement, X-ray ...
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.
Nowadays, with the depletion of high-grade scheelite resources, the efficient exploitation of complex, low grade with complicated geological structure scheelite ore have to take into account. This work introduces a feasible mineral processing method for the beneficiation of low grade and complex scheelite using the X-ray transmission …
Micro-flotation tests were conducted on the pure mineral to investigate the effects of Pb(II) on wolframite floatability. As shown in Fig. 2, the wolframite floatability with solely BHA collector was low.A maximum recovery of approximately 26% was obtained at pH around 8.5 when adding 5.8 × 10 −4 mol/L (corresponding to 1.6 kg/ton) BHA, …
Scheelite, wolframite, and cassiterite can be well collected in the roughing flotation with the recovery rate at 81.81%, 78.48%, and 68.86%. ... View in full-text. Context 3. ...
The experimental results demonstrated that NHOD showed superior collecting power to scheelite and could achieve the flotation separation of scheelite from calcite efficiently [17]. N-substituted phenyl octyl hydroxamic acid (NPOHA) is an OHA derivative that introduce a phenyl group into OHA, which is prepared through the reaction between ...
Froth flotation of scheelite has regained new focus since the 2010s and research regarding floatability and. reagents has made great progress over the years. …
Its chemical structure was characterized, and the flotation effect of wolframite and calcite was studied. (1) 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 …
The samples of wolframite and quartz were collected from Xihuashan Mine, Jiangxi province and Ningxiang, Hunan province. X-ray diffraction (XRD) analysis and particle size distribution of wolframite and quartz designated for the flotation test were given in Fig. 1.And their X-ray fluorescence spectrometer (XRF) results were shown in …
To improve the flotation recovery of tungsten minerals, 4-alkoxy benzohydroxamic acids containing C 3 alkyl (C 3 OBs), namely 4-propoxy benzohydroxamic acid (POB), 4-iso-propoxy benzohydroxamic acid (IPOB) and 4-allyloxy hydroxamic acid (AOB), were designed as scheelite and wolframite collectors.The micro-flotation …
Wolframite mineral processing method mainly in gravity separation, and includes four parts: pre-selection, gravity separation, concentration and recovery. By pre-selection and discarding the waste rock which accounts for 50% of the raw ore, the WO3 grade of the ore is enriched from 0.25% ~ 0.3% to 0.45% ~ 0.8 %, and the recovery is …
Considering the long term exploitation of wolframite and the fact that most of the wolframite ores contain less than 1% WO 3 (Luo et al., 2003), the wolframite flotation becomes crucially ...
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 …
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 …
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 for its high melting point, density, and strength. Scheelite is named after Carl Wilhelm Scheele, a Swedish chemist who discovered tungsten in 1781. The mineral is typically found in […]
Thus, the present review article also collates the surface properties and various reagent systems developed towards enhancing the flotation selectivity of scheelite particles. Further, the present communication critically reviews the flotation separation of the wolframite mineral system for the first time.
With the depletion of easily mined and separated wolframite, scheelite has become the primary source of tungsten. Flotation is the primary technique used to …
The crystal structure of scheelite belongs to the tetragonal system, with a space group of I4 1 /a and cell parameters of a = b = 0.5243 nm, c = 1.1376 nm, α = β = γ …
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 …
The innovative technology of coleaching scheelite concentrates by a mixture of sulfuric acid and phosphoric acid is an environmentally friendly and low-cost …
attention. This paper reviews the scheelite flotation reagents, including collectors and regulators, and introduces recent research pr ogress on the mechanisms …
Thus, the present review article also collates the surface properties and various reagent systems developed towards enhancing the flotation selectivity of scheelite particles. Further, the present communication critically reviews the flotation separation of the wolframite mineral system for the first time.
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 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 the corresponding ...
GYB and SS, which are widely adopted in wolframite flotation systems, were used as the collector and depressant in this study, respectively. ... including …
Bench-scale flotation tests indicated that SHA can effectively recover wolframite concentrate with 55.64% WO3 grade and 75.28% WO3 recovery from wolframite tailings by the combined shaking table ...
To verify the selective depression of SS in the flotation separation system of scheelite and cassiterite, an artificial mixture of scheelite and cassiterite (Fig. 2 (d)) in a 1:1 ratio was tested.It was observed that under weak alkaline pH conditions, SS has a better selective depressive effect on cassiterite.
1. Introduction. Scheelite (CaWO 4) is one of the main sources of tungsten, alongside with the other monotungstates stolzite (PbWO 4) and wolframite (a solid …
The wolframite-scheelite mixed ore containing tin used in this study was obtained from Hunan Shizhuyuan Nonferrous Metals Co., Ltd. The main chemical compositions, major phases and their contents, X-ray diffraction (XRD) patterns and images obtained by mineral liberation analysis (MLA) are shown in Table 1, Table 2, and Fig. 1, …
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 …
2.3.2 Batch flotation experiments The wolframite-scheelite mixed ore containing cassiterite was obtained from Shizhuyuan multi-metal mine in Hunan Province, China. …
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 …
1. Introduction. 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 …