MENU
Deng et al. synthesized a novel surfactant N-(6-(hydroxyamino)-6-oxohexyl) octanamide (NHOO) for wolframite flotation, and found that the adsorption affinity of NHOO was far stronger than that of conventional benzoyl hydroxamic acid through hydrogen bonding and electrostatic attraction by its amide group at pH < 6.69 or …
عرض المزيد
In summary, a new type of Gemini quaternary ammonium salt collector (HDDA) was designed and synthesized. It was compared with conventional collector …
عرض المزيد
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 …
عرض المزيد
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, …
عرض المزيد
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.
عرض المزيد
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. ... synchronous...
عرض المزيد
With the depletion of wolframite, scheelite has become the main source of tungsten resources worldwide. Scheelite is mainly recovered by flotation, a mineral …
عرض المزيد
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 …
عرض المزيد
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 …
عرض المزيد
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 ...
عرض المزيد
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
عرض المزيد
Recently, tungsten has drawn worldwide attention considering its high supply risk and economic importance in the modern society. Skarns represent one of the most important types of tungsten deposits in terms …
عرض المزيد
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.
عرض المزيد
Wolframite and scheelite are two critical sources of tungsten. At present, flotation is an efficient mineral processing method to recover tungsten ores of low grade and fine grain. Fatty acid is usually used as a collector of scheelite but has weak effects on wolframite flotation. ... (II) appears to have little activation on wolframite ...
عرض المزيد
This paper reviews the scheelite flotation reagents, including collectors and regulators, and introduces recent research progress on the mechanisms for the …
عرض المزيد
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 …
عرض المزيد
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 ...
عرض المزيد
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 ...
عرض 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 …
عرض المزيد
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 …
عرض المزيد
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 ...
عرض المزيد
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 substantial progress in …
عرض المزيد
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 …
عرض المزيد
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 ...
عرض المزيد
This paper reviews the scheelite flotation reagents, including collectors and regulators, and introduces recent research progress on the mechanisms for the …
عرض المزيد
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.
عرض المزيد
Materials Science. Minerals. 2023. With the depletion of easily mined and separated wolframite, scheelite has become the primary source of tungsten. Flotation …
عرض المزيد
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 …
عرض المزيد
1. Introduction. As the main source of tungsten and an important strategic mineral (YIN and WANG, 2014, Feng et al., 2015, Gao et al., 2016a), scheelite (CaWO 4) usually coexists with calcite in nature.Froth flotation is the most commonly used method for separating these minerals (Kupka and Rudolph, 2018).However, the selective separation …
عرض المزيد
Wolframite Flotation ... Scheelite and wolframite are the two main resources of tungsten metal (Chen et al., 2017a, 2017b; Meng et al., 2015). Generally, wolframite is recovered by gravity se-paration methods when the particle size is sufficiently large (Ai et al., 2017; Pradip, 1996). However, with the exploitation of high-grade wolframite ...
عرض المزيد
In this study, a new hydroxamic-acid molecule - sebacoyl hydroxamic acid (SHA) was synthesized and characterized. It was the first time that SHA with dual hydroxamic acid groups of "crab" structure was used as a collector for wolframite flotation, and its collecting ability was compared with the traditional collector benzohydroxamic …
عرض المزيد
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 ...
عرض المزيد
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, …
عرض المزيد
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.
عرض المزيد
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 …
عرض المزيد
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 …
عرض المزيد
Copyright © 2024 Sofol Industry & Technology Group Co., Ltd.
المنتجات
محلول
حول الولايات المتحدة
اتصل بنا