آخرین محصولات
Selective modification of malachite with ammonium …
The malachite and calcite surfaces treated with CH 6 N 2 O 2 and Na 2 S·9H 2 O featured a flotation recovery rates of 82.51% and ∼ 20%, respectively, and achieved a satisfactory selective flotation separation of malachite from calcite. CH 6 N 2 O 2 could promote the formation of Cu-S on the malachite surface. A large number of Cu-S on the …
Interaction mechanism of copper ions with the surface of …
Furthermore, the activity of the sulfidization products on the sulfidized mineral surface increased and sulfidization flotation of malachite was promoted. The surface of sulfidized malachite treated with a high concentration of copper ions is shown in Fig. 9 (c). The binding energy of Cu 2p 3/2 slightly changed.
Sulfidization, Xanthate-Flotation of Malachite
malachite surfaces by ammonium ions, based on XPS analysis and sulfur residual concentration data. Indeed, these researchers have gained some important insights into the role of ammonium ions on the sulfidization and flotation of malachite [10–14].
Cu(I)/Cu(II) mixed-valence surface complexes of S-[(2
The micro-flotation results demonstrated HABTC was an excellent collector for malachite flotation and exhibited favorable selectivity for flotation separation of malachite from quartz or calcite under pH 8.5–10.3. ... Then the mixture was transferred to the Hallimond tube and flotation was conducted for 3 min with a nitrogen gas flow rate …
Evaluation of L-arginine as an Eco-Friendly Activator for Malachite …
Why LA was first introduced as a sulfidization activator to enhance sulfidization flotation of malachite? Because of its structure? What might be the interaction? What is the hypothesis? ... Comment 14: What was the air flow rate in flotation? Response: The flotation is carried out on XFG-type flotation machine. The …
Flotation activation mechanism of trithiocyanuric acid to malachite …
The results revealed that direct flotation of malachite yielded a recovery rate below 20 %. After activation with 90 mg/L sodium sulfide, the flotation recovery reached 37.87 % at pH 9.0. ... CFD simulations of natural convection particle-laden flow with CRW turbulent dispersion model employing the specialized solver containment. …
Sodium trithiocarbonate as an activator for malachite …
Flotation process flow chart of mineral samples. As indicated in Table 3, the application of ST-activated flotation to a mixed copper oxide ore, inclusive of malachite, resulted in the production of copper concentrate with a copper grade of 24.95 % and a copper recovery rate of 91.20 %. This outcome demonstrates a substantial separation …
Application of Depletion Attraction in Mineral …
Malachite particle experiments show increased flotation efficiency with an increase in the concentration of PEG, whereas the floatability of silica particles increases only slightly. The flotation …
Mechanistic insights into stepwise activation of malachite for
Therefore, a new sulfidization flotation process was developed to promote the efficient recovery of malachite. In this study, Cu 2+ was used as an activator to interact with the sample surface and increase its reaction sites, thereby strengthening the mineral sulfidization process and reactivity.
Malachite flotation using carbon black nanoparticles as …
Section snippets Materials and reagents. Malachite (CuCO 3 ·Cu(OH) 2), which was used as a raw material, was obtained from Junsei Co., Japan.The manufacturer reported that it has 55% Cu, and it is spherical in shape. Two sieves with −100 and +200 mesh (Tyler Standard) were used to separate particles to obtain only malachite …
Novel application of depletion attraction in malachite flotation…
The conventional flotation on malachite involves sulphidizing the malachite surface prior to selective flotation using a sulphodryl collector such as xanthate [7]. This process is known to be effective concerning the selectivity of the malachite surface. ... and it remains largely unknown how much the fluid flow affects the malachite-bubble ...
Effect of Ammonium Sulfide on Sulfidization …
In malachite flotation, the most common approach is to use xanthate collectors in the existence of sulfidizing reagents for floating the malachite minerals. In the sulfidation flotation method, Na 2 S, (NH 4 ) …
Effect of Ammonium Sulfide on Sulfidization Flotation of Malachite
Notably, malachite with ammonium sulfide ions had a significantly higher flotation recovery than malachite with an excess of sodium sulfide ions, as concerns of sulfidization types.
New Insights into the Role of Thiol Collectors in …
Malachite is one of the most important copper-bearing oxide minerals; however, it shows poor floatability prior to sulfidization under the thiol collector system. This study investigated the reasons for the low …
Synthesis and application of dithiocarbamate oxadiazole …
The temperature of the flotation process was 25 °C, and the nitrogen flow rate was 300 ml·min −1. The resulting concentrates and tailings were filtered, dried, weighed, and flotation recovery was calculated according to Eq. ... Compared to the traditional collector OHA for malachite flotation, MHCODT exhibits stronger recovery …
Effects of calcium ions on malachite flotation with octyl …
In this study, the effects of calcium ions on the flotation of malachite with octyl hydroxamate collector has been investigated using micro-flotation, zeta potential, contact angle, adsorption, and particle size measurements.
Hydroxamate Flotation of Malachite
AbstractThe point of zero charge (PZC) of malachite has been determined to be pH 7.9, which is found to correspond closely to the weighted average of EP(Cu2+, HCO3−) and EP(CuOH+, Cu(OH) 3−) of the malachite-water-air system. The hydroxamate flotation of malachite is effective between pH 6 and 10, a region in which HCO3− and CuOH+ ions …
How to Process Copper Ore: Beneficiation Methods and Equipment
Process flow: The dosage of sodium sulfide can reach 1~2kg/t during vulcanization. Because the film produced by vulcanization is not stable and is easy to fall off after vigorous stirring, and sodium sulfide itself is easily oxidized, sodium sulfide should be added in batches. ... Acid leaching—precipitation—flotation. Scope of application ...
A DFT study on the structure–reactivity relationship of aliphatic oxime
Micro-flotation experiments were performed in a 220 mL Hallimond tube. In each test, 2 g malachite samples with the particle size ranging from +38 to −76 μm were put into a 500 mL flask. A desired amount solution of flotation collector and distilled water were added into the flask, reaching a total volume of 220 mL.
Bioflotation of malachite using different growth phases of Rhodococcus
Overall, malachite flotation efficiency tends to increase with increasing bacteria concentration for both growth phases. ... To investigate the effects of the actual flotation process, we paid attention to how fluid flow affected this flotation process. Since agitated fluid can apply shear stress to bacteria on malachite and detach them, the ...
Bioflotation of malachite using different growth phases of …
Bacteria in different growth phases are studied for the malachite flotation. • Bacteria in the stationary phase show higher malachite floatability. • Bacteria in both growth phases have the same surface properties. • Bacteria in the mid-exponential phase are …
Novel chelating surfactant 5-heptyl-1,2,4-triazole-3-thione: …
While for malachite, its flotation recoveries increased from 38.26% to 78.62%, and then to 79.41% with nitrogen flow rate increasing from 50 to 200 mL·min −1, and then to 250 mL·min −1, which displayed that the preferable nitrogen flow rate for malachite flotation was around 200 mL·min −1. At this flow rate, the flotation recovery …
Application of Depletion Attraction in Mineral Flotation: …
Along with the accompanying theory article, we experimentally investigate the effect of the depletion attraction force on the flotation of malachite. While varying the concentration of the depletion agent (polyethylene glycol), three different systems are studied: pure malachite, pure silica and a 1:1 mass ratio of malachite and silica binary …
Minerals | Free Full-Text | A New Collector for Effectively
A new method, staged flotation for effectively increasing the recovery of ultra-fine copper oxide ore with a new type of collector (ZH-1, C3-5 carbon chain xanthate) is proposed for the first time. The flotation process and mechanism were examined by flotation tests, entrainment rate analysis, laser particle size experiments and …
Froth Flotation (Sulphide & Oxide)
Hello recently, I am working on processing of a gold bearing mixed oxide-sulfide copper ore (Av. Cu; 0.80 & Av. Au; 0.2ppm). After some research and testing different methods, I found Controlled Potential Sulphidisation (CPS) Flotation as the most effective & practical method on similar ores (E.g., Kanmantoo, Australia & Kansanshi, Zambia).
Sulfidization mechanism in malachite flotation: A heterogeneous solid
Sulfidization followed by xanthate flotation is an effective technique to recover copper oxide minerals.However, the sulfidization mechanism of malachite has not been determined. In this work, the sulfidization mechanism was investigated by microflotation, field emission scanning electron microscopy (FESEM), energy dispersive …
Enhanced sulfidation xanthate flotation of malachite using …
The results show that the addition of ammonium sulfate played a significant role in the sulfidation of malachite, and this sulfidation could facilitate its flotation and improve flotation...
A Multistage Sulphidisation Flotation Procedure for a Low …
This study was carried out to develop a flotation procedure for an oxide copper ore from a Region in Central Africa for producing an 18% copper concentrate for downstream processing at maximum recovery from a 4% copper feed grade. The copper recoveries achieved from the test work were less than 50% despite changes in reagent …
Partial replacement of sodium oleate using alcohols with …
A natural malachite sample was obtained from the Lupe mine, Puebla, Mexico. The sample was crushed, hand-sorted and dry-ground to obtain different fractions for different applications, namely, lumps for contact angle measurements, particles of −75 + 38 µm for micro-flotation tests, and fine particles for zeta potential measurements.
Sulfidization, Xanthate-Flotation of Malachite
minerals Article Reexamining the Role of Ammonium Ions in the Sulfidization, Xanthate-Flotation of Malachite Ruizeng Liu 1, Zhicheng Liu 2, Jianmin Li 3, Shunfu Ao 2, Bin Pei 1, Dianwen Liu 1,* and Jialei Li 1,* 1 Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China; liuruizeng@126 …
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