A scheelite concentrate is recovered from a scheelite ore containing silicate minerals and other calcareous minerals by froth flotation which process comprises grinding the ore sufficiently fine to liberate the scheelite grains, pulping the gound ore with water to form a slurry containing between about 20% and about 40% solids by weight, sequentially …
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flotation separation of scheelite from fluorite. In the scheelite flotation strategy, the functional groups of the depressants perform crucial tasks, and are mostly organic or inorganic. Inorganic depressants comprise PO 3º, SO 2º, and SiO 32º. The sodium silicate-based depressants can depress the gangue minerals
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Our previous work showed that HDDA could successfully separate scheelite from calcite at room temperature [26], but here, in order to highlight the flotation behavior of HDDA at room temperature and low temperature, it is compared with the conventional collector DDA.As shown in Fig. 3 (A), at 25 ℃, 0.5 × 10 −4 mol/L HDDA could achieve a …
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Abstract: Flotation separation of scheelite from calcite is difficult due to the similarities in their surface properties. In this work, the flotation behavior of scheelite and calcite …
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Mixed scheelite and calcite flotation tests have been conducted were conducted with mixed OPS/BHA collectors at pH 9 using 300 mg/L water glass and the result is shown in Table 2. It can be seen from Table 2 that the recovery of scheelite is 76.28% and the grade of WO 3 is 61.41%.
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1. Introduction. Scheelite (CaWO 4) is an important mineral for extracting tungsten and usually associated with fluorite in Chinese scheelite deposits. 1,2 The utilization of refractory scheelite deposits—wolframite resources that can be easily separated via the gravity method and are almost depleted—has become important. …
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The flotation separation of scheelite and calcite by froth flotation is difficulty as these two minerals have similar physicochemical characteristics. To solve this problem, the role of calcium lignosulphonate (CLS) in the flotation separation of scheelite from calcite has been studied and the separation mechanism has been discussed.
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The main challenge in scheelite flotation lies in the contamination of the concentrate by other calcium-bearing minerals, mainly calcite. To remedy this problem, sodium silicate is frequently used as a depressant. According to the literature, one hypothesis for the mechanism of water glass consists in its absorption onto calcite …
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exhibited exhibited a higher selectivity for the flotation separation of scheelite from calcite and fluorite than the 733-collector alone.. Huang et al (2016) found that there is a high selectivity and recovery for the flotation of scheelite from calcite at pH 7 using Corresponding author. E-mail address: liucheng309@sina (C.Liu)
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Various reagents suitable for scheelite flotation (collectors and depressants, mostly) are reviewed in the present work, with a strong focus on the separation of scheelite from calcium salts ...
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Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study. Fen Xu ... Application of EDTMPS as a novel calcite depressant in scheelite flotation. Fen Jiao, Wei Li and 5 more Open Access. A consecutive joint shear strength model considering the 3D roughness ...
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The addition of ferrous sulfate as a depressant for Ca-bearing minerals such as calcite and fluorite during scheelite flotation was investigated to recover scheelite from tungsten mine tailings, using Hallimond-tube flotation tests, zeta-potential measurement and Fourier-transform infrared (FT-IR) analyses. The flotation tests …
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A marketable grade of scheelite is rarely, if ever, made by flotation, but an increased recovery is realized by its use and the product can be treated by soda ash solution in an autoclave. In this process the scheelite is dissolved and, by addition of lime, calcium tungsten, or "synthetic scheelite," is precipitated. Reagent Combinations
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They contain fine-grained scheelite (CaWO 4) associated with complex gangue minerals, i.e., minerals that display similar properties, particularly surface properties, compared to scheelite. Consistently, the froth flotation of scheelite still remains, in the twenty first century, a strong scientific, industrial, and technical challenge.
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Flotation experimental results show that NTIA provides good flotation and separation effects on the scheelite in a wide range of pulp pH (6.0–10.0). At pH 7.0, the flotation recovery of ...
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Sodium oleate (NaOL) and benzohydroxamic acid (BHA) are commonly used scheelite and cassiterite flotation collectors. Hydrophobic flocculation flotation of fine minerals has been extensively studied and reported under a NaOL system, but not under a BHA system. In this paper, the particle size distribution and flotation behaviour of fine …
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Fine scheelite Agitation medium 1. Introduction With the rapid utilization of mineral resources, fine skarn-type scheelite ore has become the main resource of …
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Fluorite and scheelite, which are strategic calcium-bearing minerals, have similar active sites (Ca2+); as a result, the efficient separation of the two minerals is still one of the world's most difficult problems in the field of flotation. In this work, N-decanoylsarcosine sodium (SDAA), a non-toxic and low-cost amino acid surfactant, was …
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The separation of scheelite and calcite is a challenging problem in flotation production. In this study, the effects and mechanisms of oxidized paraffin soap (OPS) and octylphenol polyoxyxyethylene ether with 10 oxyethylene glycol ethers (OP-10) as a mixed collector to collect scheelite from calcite were surveyed by micro-flotation, Fourier …
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Scheelite Calcite Flotation Lead nitrate Benzohydroxamic acid Sodium oleate 1. Introduction As the main source of tungsten and an important strategic mineral ( YIN …
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Minerals 2020, 10, 971 3 of 13 and increase the recovery of the scheelite. Moreover, 1–5 kg/t of Na2CO3, NaOH, Na2S, and CaO were used as pH modifiers, 4–7 kg/t of Na2SiO3 as a depressant ...
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Tungsten is an essential metal for the manufacture of special alloys, which is in constant demand due to the development of the industry. The recovery of scheelite from undeveloped tungsten ore in South Korea was investigated to improve the flotation performance for high grade and recovery of concentrate. To investigate the interaction …
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Chen et al. [19] has confirmed that CLS was an attractive selective inhibitor in the flotation of scheelite from calcite in natural environment. Wang et al. [20] found that Fe 3+ activated quartz could be selectively depressed using CLS as depressant at alkaline pH in the flotation of hematite.
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1. Introduction. Scheelite is a principal tungsten mineral and the main source of tungsten metal in China. In recent years, using hydroxamic acids as collectors has been the convenient approach for the selective flotation of scheelite in complex calcium minerals flotation (Kupka and Rudolph, 2018, Yang, 2018).It is worth noting that the chelation …
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An efficiently optimized reagent regime was investigated to improve scheelite heating flotation. The scheelite grade and recovery in the plant were significantly improved by 5% and 6%, respectively, which remarkably augmented the economic profit by $260,000 per month. The interaction mechanisms of sodium sulfide and sodium oleate …
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To improve the performance of sodium silicate in scheelite flotation and allow the selective separation of scheelite from other semi-soluble salt-type minerals such as calcite, three acids, sulfuric, oxalic and for the first time hydrochloric are used to acidify sodium silicate (also called water glass). A literature review of previous usage of acidified …
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The flotation experiment results showed that scheelite and calcite could be efficiently separated under the following conditions: pulp pH=9.5, NaOL concentration of 1.5×10 −4 mol/L, EDTMPS concentration of 3.0×10 −5 mol/L, a scheelite concentrate with WO 3 grade of 65.49%, recovery of 83.29% and separation efficiency of 65.29% could be ...
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The ideal pH for scheelite flotation however ranges from 8 to 11 with some authors restricting it between 9 and 10 [32], [33], [34]. A pH of 9 is usually given as the optimum regardless of the reagent combination. Different pH modifiers can be used in scheelite flotation, such as sodium hydroxide, sodium carbonate or calcium oxide.
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Flowsheet of the batch type scheelite flotation from tungsten ore. The FTIR analysis was carried out using a FTIR-ATR spectrometer (Nicolet 6700 FTIR Spectrometer with Attenuated Total Reflectance, Thermo Scientific, Waltham, MA, USA). For measurement, the samples were ground to particles less than 5 m using an agate mortar. ...
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This study investigates the effects of silicate removal from recycled wastewater on scheelite flotation performance. Systematic experiments were conducted to identify and evaluate the mechanisms underlying the influence of sodium silicate on scheelite flotation and silicate removal. When the sodium silicate concentration …
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Abstract and Figures. The main challenge in scheelite flotation lies in the contamination of the concentrate by other calcium-bearing minerals, mainly calcite. To remedy this problem, sodium ...
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The X-ray powder di raction spectra of scheelite and calcite are presented in Figure S1. The purities of the mineral samples were more than 98.5%. The measured exposed planes of scheelite are {1 0 1} and {1 1 2}, whereas those of calcite is {1 0 4}, which is also the most common cleavage plane for scheelite and calcite during crushing or ...
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Scheelite, alongside other similar calcium-bearing minerals such as fluorite and calcite, is predominant in tungsten, and scheelite ores are commonly separated and utilized by the implementation of the froth …
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Conventional flotation practice for separating scheelite from fluorite utilizes sodium silicate (SS) (water glass) to depress fluorite followed by a fatty oil collector such …
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The composition of a collector directly affects its collecting performance in mineral flotation. In this study, three vegetable oils were used as the collectors, the flotation performance of scheelite and the differential analysis were studied through flotation experiments, zeta potential, contact angle measurement and Fourier transform …
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In this paper, the potential of sulfonated naphthalene formaldehyde (SNF) condensate as a depressant in the flotation separation of scheelite from calcite was verified and investigated. The results of microflotation experiments showed that SNF had a stronger depressant performance on calcite than a conventional depressant—water …
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