No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
To investigate the sulfidization–flotation behavior of malachite, batch flotation experiments were conducted in a 50 mL Hallimond tube using 5 mL/L nitrogen gas as flotation gas. In a flotation test, a 0.5 g powder sample and deionized water were placed in a beaker, which then was stirred for 1 min with a mechanical stirrer.
When the pH is higher than 10, numerous hydroxide anions exist in the pulp, which can competitively adsorb with xanthate anions on the malachite surface, thus decreasing the flotation recovery of malachite. Similar to the flotation results of malachite, chrysocolla and cuprite show good floatability at pH 9 and 9.5, respectively [91], [92].
At pH 6.50, with 8 mg/L SDA, effectively recovering malachite from quartz was achieved by reverse flotation, in which 92.71% of malachite was recovered and 91.91% of quartz was removed, coupled ...
In this study, the goal was to investigate the effect of the sulfurization process using different types of sulfidizer reagents, such as ammonium sulfide and sodium sulfide, on …
Each test was conducted with magnetic stirring for 5 min (700 rpm) and mixed 10-mL solution volumes were extracted after centrifugal separation. The residual xanthate concentration in suspension was determined by UV spectrophotometry and the amount of collector adsorbed on the mineral could be calculated. ... Malachite flotation recovery as a ...
The effect of ammonium ion on the sulfidation flotation of malachite was investigated using microflotation test, inductively coupled plasma (ICP) analysis, zeta potential measurements, and ...
The micro-flotation test results showed that 5-NSA produced high recovery of malachite at pH 9.0–10.0, while showing lower collecting power to calcite or quartz. The contact angle analysis results indicated that the hydrophobicity of malachite surface was promoted after the adsorption of 5-NSA.
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 spectroscopy (EDS), …
For the single-mineral flotation test, malachite (2 g) and deionized water at the required concentration for the test were placed in the cell. The reagents were added in sequence and allowed to react for a period of time. Copper lead zinc ore was used to prepare the copper oxide samples, and the original sample was screened. ...
Sulfidization xanthate flotation remains the most promising method for the beneficiation of malachite. In this study, L-arginine (LA) was first used to modify the malachite surface and improve the ...
The flotation test of real ore contained these two minerals further confirmed that the malachite could be separated from calcite using PX as the collector. The mechanism and characterization analysis show that the selective substitution reaction between xanthate ions and OH ions on the malachite surface could generate hydrophobic substances of ...
At the Na 2 S concentration of 5 × 10 −4 M recommended by the flotation test, the adsorption density of S species on the TEA-modified malachite surfaces was approximately 0.118 mmol/m 2, which was about 13.46 % higher than that on the unmodified malachite (approximately 0.104 mmol/m 2). The results also provided evidence that TEA ...
Fig. 1 XRD pattern of malachite 2.2 Flotation test A micro-flotation experiment was conducted by operating an XFG II flotation machine with an effective cell volume of 40 mL. The impeller speed of flotation machine was l650 r/min. Firstly, malachite was dispersed in water for 2 min. After the pH adjustment, a collector was introduced and ...
Flotation recovery of malachite as a function of NaBX concentration in the absence or presence of different concentrations of (NH 4 ) 2 SO 4 using 5 × 10 −4 mol/L Na 2 S·9H 2 O as a ...
The effect of ammonium ion on the sulfidation flotation of malachite was investigated using microflotation test, inductively coupled plasma (ICP) analysis, zeta potential measurements, …
In this study, evolution of the sulfide product morphology on the malachite surface was observed after treatment with various concentrations of sodium sulfide. In addition, the …
An XFGII flotation machine (with a 40 mL microflotation cell) was used for the microflotation tests. For each flotation test, a 2 g malachite sample with a particle-size range of 38–74 µm was used. First, freshly prepared sodium sulfide (Na 2 S) solution was used as a sulfidizing agent, and the sulfidization time was 5 min. In the process ...
Fig. 1 (c) and Fig. 1 (d) compares the results of sulfidization flotation of malachite with and without ferrous ions, in which the dosages of the collector (NaBX) was variable, ferrous ions and sodium sulfide concentrations were controlled at 1 × 10 −3 mol/L, and the pH range during sulfidization was consistent with the flotation test above. The concentration of the …
Ammonium ions have positive effects on the sulfidization flotation of malachite; however, the underlying mechanisms remain poorly understood. In the present work, micro-flotation tests, field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and …
of malachite, each flotation test was conducted at least three times, and the average results were calculated with a typical variation of ±1.8%. 2.2.2. Zeta-potential measurements The zeta-potential measurements of malachite were conducted using a Nano-ZS90 zeta-potential analyzer (Malvern Instruments Ltd., Britain). ...
all the test processes. Intensity / a.u. Malachite PDF No. 41-1390 2 / (°) Fig. 1. XRD pattern of malachite samples. 2.2. Micro-flotation experiments Flotation was conducted in a 40 mL XFG–II micro-flota-tion machine. A malachite sample (2 g) with particle sizes of 38–74 μm was used during the micro-flotation test. A CuSO4
In single mineral flotation test, 40 mL of deionized water and 2.0 g of malachite or talc samples were placed in the flotation cell. Then, NaOH or HCl solution was used to adjust the pH to an expected value, after which the desired amount of famciclovir was added and allowed to react for 3 min, and then 2# oil was added and allowed to react for ...
The flotation test results showed that TMT exhibited superior activation performance over sodium sulfide, achieving a high flotation recovery rate of 97.50 % at TMT 90 mg/L and pH 7. The contact angle confirmed malachite improved from 53.3° to 90.1° after TMT treatment, indicating enhanced hydrophobicity of the mineral surface.
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 …
This test was performed using the XFG–II flotation machine at an available cell of 40 mL and the rotation speed of 1600 r/min was used in the malachite flotation test. Before the experiment, a malachite sample (2 g) was placed in a flotation tank, and 35 mL of ultrapure water was added for slurry mixing.
In this study, the flotation separation performances of malachite from calcite were investigated using a new chelating collector S-carboxymethyl-O, O'-dibutyl dithiophosphate …
Sulfidization xanthate flotation remains the most promising method for the beneficiation of malachite. In this study, L-arginine (LA) was first used to modify the malachite surface and improve the ...
malachite and calcite on the flotation behavior of both miner-als is of great importance. In the present work, the flotation behavior of malachite and calcite under the sulfidization–xanthate system and in the presence of dissolved components of both minerals was as-sessed by performing micro-flotation tests. The specific sur-
In each flotation test, 3 g of the fine malachite sample (−25 µm) was conditioned for 2 min in 130 mL of distilled water, and the suspension was adjusted to the desired pH by using HCl or NaOH. Then, a given amount of octyl hydroxamate was added and conditioned for 3 min. After that, the conditioned slurry was transferred to the Hallimond ...
In our study, the flotation test for pure minerals such as malachite, calcite, and quartz was conducted using a 30 mL XFGII-type flotation machine, which operated at a constant …
