In a follow up study, Mukherjee, Hubli and Gupta (Citation 1985) investigated the oxygen pressure leaching of a copper-nickel flotation concentrate in a chloride medium consisting of cupric chloride, sodium chloride and hydrochloric acid. The role of cupric chloride was to serve as a regenerable oxidant in solution (like ferric chloride), with ...

The Direct Leaching of Nickel Sulfide Flotation Concentrates - A Historic and State-of- the-Art Review Part II: Laboratory Investigations into Pressure Leaching ... From this review, it is apparent that sulfuric acid pressure leaching processes have received the most attention relative to other lixiviant systems such as ammonia/ammonium ...

Increasing demand for lithium-ion batteries has led to the development of several new lithium mineral projects around the globe. Some major mineral processing challenges these projects face are similarities in gangue and value mineral behaviour and poor selectivity in froth flotation. Unsaturated anionic fatty acids are the primary …

Effective purification of graphite via low pulp density flotation-low temperature alkali roasting-acid leaching route: From laboratory-scale to pilot-scale Hochol Ri, Kyonghun Ri, Kwangchol Kim, Kyongho Ri, ...

Zhang et al. 29 carried out a sulfuric acid curing leaching process for extracting lithium from lithium-rich tailings obtained from bauxite flotation, but the leachate contains impurities such as aluminum, iron, sodium, potassium, and calcium. Due to the discharge of acidic waste water, the acid leaching process for lithium extraction faces a ...

Direct acid leaching was conducted to recover rare earth elements (REEs) from an allanite ore assaying 9,861.4 ppm of REEs. The effects of operational variables, such as acid type, sulfuric acid (H 2 SO 4) concentration, temperature, solid/liquid (S/L) ratio, and particle size, on the total REE (TREE) recovery were systematically …

For such a purpose, typical purification methods (conventional leaching, flotation-acid leaching) were investigated and compared to OEAL. The experimental outcomes indicated that the process efficiency for removing SPL impurities by various methods had the following sequence from high to low: OEAL > flotation-acid leaching > …

The flotation-acid leaching-treated SPL survey spectrum shows apparent C 1 s peak at about 284.6 eV and weak O 1 s, F 1 s, and Na 1 s peaks at 532.7 eV, 684.9 eV, and 1073.0 eV, respectively. The results indicated the flotation-acid leaching-treated SPL contains a small amount of NaF. When SPL was processed by the OEAL method, the …

It was reported that final products with a carbon content of 90.88–98.36% were prepared from flotation concentrate with a carbon content of 84.27% by alkali-acid leaching [Wang, et al., 2018]. The carbon content of the final product was improved to 99.68% through the chemical purification process of H2SO4/H2O2–NaOH–HCl from the …

leaching, achieving an efficiency in the flotation concentration stage higher than 75%. Based on the performed experimental results, the flow sheet for processing of the mixed …

The extraction of nickel (Ni) from sulfide resources commences with flotation to produce a concentrate which is then smelted to produce a nickel-enriched phase called matte, and further refined to produce pure Ni products as well as by-products, …

One example of bioleaching of copper from flotation tailings is the copper mine at Bor, Serbia, where the benefits of a higher metal recovery with bioleaching compared to acid leaching was demonstrated, combined with a lower environmental impact (Stanković et al., 2015).

The products obtained in the flotation tank by this process were further processed by acid leaching, increasing the overall copper and cobalt recoveries . Therefore, considering the perspective of beneficiation and metallurgy cooperation, the pre-removal of carbonate gangue minerals in low-grade zinc oxide ores via reverse flotation …

However, because the acid leaching process results in acidic residues, leaching processes that do not involve acid should be developed to promote environmental friendly alternatives. ... Froth flotation separation of carbon from barium slag: Recycling of carbon and minimize the slag. Waste Management, Volume 120, 2021, pp. 108-113.

In this study, a hydrometallurgical method for the recovery of copper, cobalt, and zinc from copper slag flotation tailings (SFT) was investigated. SFT contains large amounts of valuable metallic compounds, such as copper, cobalt, and zinc. A representative SFT sample containing 0.50% Cu, 0.148% Co, 3.93% Zn, and 39.50% Fe was used in …

The flotation recovery of these three minerals increased significantly with increasing pH, and the recovery was above 90% at pH 8–10. The adsorption. Conclusions. In this study, a new method of acid leaching and reverse flotation for fluorite concentrate was developed and applied based on mechanism analysis and bench-scale tests to …

An alkali roasting process, which consists of roasting with caustic soda, water washing and sulphuric acid leaching, has been found to be an effective method for graphite purification even at low roasting temperature. With this process, a flotation fine concentrate containing 87–88% carbon could be purified to about 99.4% carbon when roasted with …

The flotation concentrate and acid leaching residue were subjected to XRD to determine the mineral contents. As seen in Figure 18, the main contents of the both products were anatase, followed by rutile and hematite. However, compared to the flotation concentrate, the contents of Ti-bearing minerals, anatase, and rutile were significantly ...

Effects of pre-treatment methods such as calcination for thermal activation and intensive milling for mechanical activation on the aluminum (Al) recovery by acid leaching of preliminarily enriched pyrophyllite ore via attrition scrubbing and froth flotation were investigated. XRD patterns of the calcined and the intensively milled samples were …

The chemistry of the leaching process revolves around oxidation of the uranium compounds, which is typically achieved using manganese …

The flotation combined with alkali-melting acid leaching is feasible to obtain the high purity of graphite. The PG1 with the fixed carbon content of 85.23% can be …

The natural flake graphite (GO) with an initial fixed carbon content of 6.23% is purified using flotation combined with alkali-melting acid leaching to obtain the high purity graphite (PG3) for ...

In 2019, Constantin evaluated acid leaching for precious metal extraction from tailings sourced from the Baia Mare Central Flotation Pond, which contained …

A perspective of stepwise utilisation of Bayer red mud : Step two—extracting and recovering Ti from Ti-enriched tailing with acid leaching and precipitate flotation. J. Hazard.

Mono-rhamnolipids has been assayed in the leaching and flotation of rare earths and metal elements from the soil, where it showed lower activity than saponin (Hogan et al. ) (Table S2) (Fig. ... The richness of the oil by oleic acid favored the flotation of …

Concentrates obtained by flotation of such ores are unsuitable for pyrometallurgical processing owing to their poor quality and low metal recovery. This paper presents the leaching of chalcopyrite concentrate from the location "Rudnik, Serbia". The samples from the flotation plant were treated with hydrogen peroxide in sulfuric acid.

The recovery of zinc from a flotation tailing using 17-different leaching agents, including inorganic and organic acids, alkaline solutions and chelating agents, was investigated. The effects of the lixiviant type, acid concentration, leaching temperature, leaching time, and solid-to-liquid ratio on the metals dissolution were studied.

A combination of flotation and acid leaching was conducted, one roughing stage, three cleaning stages, as well as one scavenging stage, were involved in the flotation; the sulfide concentrate was collected; and the oxide tailings underwent acid leaching, bringing the recovery of copper and cobalt to 96.6% and 86.0%, respectively.

An effective flotation process was proposed for selective recovery of elemental sulfur from an oxygen pressure acid leaching residue of zinc sulfide concentrate. The optimal closed flotation process is: one-time blank rougher, two-time agent-added roughers, and two-time cleaners, and the selected collector and inhibitor were Z-200 and …

The flotation experiments of oxygen pressure acid leaching residue were carried out in an XFD-63 flotation machine. First, the tap water and residue were put into the cell, and the pH value of formed pulp was regulated to around 8.0 …