ore leaching silicate

the silicate structure sufficiently to enable effective leaching. The U.S. Bureau of Mines has been conducting bench- scale studies to determine the feasibility of leaching a Mn- bearing silicate ore with acid and fluoride as an alternative to extractive techniques requiring a high-temperature and energ-intensive pretreatment step.

leaching of ores from mines and processing plants as well as waste ores from dumps and further processing by solvent extraction and electrowinning (SX/EW) [16]. Biological leaching was proved to be efficient for sulfides of Co, Ga, Mo, Ni, Zn, and Pb [16].

An extensive diagnostic leaching indicated the effect of mineral speciation and elemental distribution within the ore on leachability and the need for strong acid for breaking the oxide/silicate lattice in smectite. Acid leaching with 4.5 mol dm-3 H 2 SO 4 at 25% solids and 97 ⁰C over 6 h gave the best leaching efficiencies of 99% Ni, 96%

Sep 01, 2009· Leaching of the ore at pH ca. 2, transforms the silicate compounds of the ore to colloidal silica, i.e., a gel (Matthew and Elsner, 1977). Process kinetics and optimum operating conditions have been studied for the leaching of zinc silicate ore tailings.

The bio-leaching method can recycle valuable metals from complex lean ore and secondary resources, especially suitable for heap leaching and in-situ leaching of difficult to smelt mineral (Dopson et al., 2009). Applicating silicate bacteria to bio-leaching of fly ash containing a large number of crystals and amorphous silicate compounds has the ...

a zinc silicate ore containing hemi-morphite (Zn 4Si 2O 7 (OH) 2·H 2O) and smithsonite (ZnCO 3) as major zinc minerals. Similarly, Abdel-Aal (2000) studied the leaching of a zinc silicate ore containing willemite and hemi-morphite and observed that as temperature was increased from 40°C to 70°C, zinc extraction enhanced from 70 to 95%. 3.3.

The bioleaching of a low-grade Indian uraninite ore (triuranium octoxide, U 3 O 8 : 0.024%), containing ferro-silicate and magnetite as the major phases, and hematite and pyrite in minor amounts ...

Mar 16, 2019· Consumption of zinc metal has been rapidly increased in the world. Zinc metal exists as oxide, sulfide, carbonate and silicate ores, among which zinc oxide ores have not been mined because it is very difficult to separate zinc from gangue or to concentrate using the conventional flotation processes. In the current study, a low-grade zinc oxide ore containing 5.9% Zn, 33.4% Fe and …

The alkaline leaching kinetics of a zinc silicate ore assaying 34.1% Zn, 11.1% Fe and 22.9% SiO 2 is studied in sodium hydroxide solutions. Speciation diagrams indicate zinc dissolution as [Zn(OH) 4] 2− and SEM analysis showed a progressive reduction in particle size during leaching which supports the shrinking particle model.

Extraction of Nickel from Magnesia–Nickel Silicate Ore ... Sampling. Magnesia–nickel silicate ore samples were obtained from the Mangshi area of China, and they contained 0.83% Ni, 5.63% Fe, 0.015% Co, 31.25%

Apr 29, 2021· After the ore is weathered, Si and Ni are released, which then leach, migrate, and deposit to form the nickel silicate ore. Nickel-oxide pyrotechnics mainly include rotary kiln drying, pre-reduction, electric furnace smelting, rotary kiln direct reduction, reduction–vulcanization smelting, and blast furnace smelting of Ni–Fe.

Jan 28, 2009· Improvement of leaching conditions increased this to 20% within 6 h. Besides the manganese in the ore, 45% of the aluminum and 8% of the iron were dissolved in this time interval. This demonstrates that bioleaching of manganese from silicate ore is feasible, thus opening up new possibilities for the mineral processing industry.

Jul 01, 2003· Made available by U.S. Department of Energy Office of Scientific and Technical Information ...

Leaching nickeliferous silicate ores with hydrochloric acid. Canadian Patent 1024353. Oelkers, E. H. 2001. General kinetic description of multioxide silicate mineral and glass dissolution. Geochimica et Cosmochimica Acta, 65 (21), 3703 ...

The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the valuable metal ion comes into the solution. During leaching the silicate ion first dissolves, but simultaneously decomposes and is ...

A shrinking particle--shrinking core model for leaching of a zinc ore containing silica. Download. Related Papers. Kinetics of hydrochloric acid leaching of smithsonite. By mustafa birinci. Dissolution kinetics of smithsonite ore as an alternative zinc source with an organic leach reagent.

In recent years much emphasis has been placed on the leaching of zinc silicate ores by sulphuric acid, because these are the next best source for zinc after sulphide ores. An attempt has been made to assess the suitability of sulphuric acid as leachant for the silicate ore found in Paedang (Thailand) and also to study the effect of a new flocculating agent on the coagulation of silicic acid.

Leaching of metals with carbon‐heterotrophic microorganisms and organic acids as active agents has been performed with Timna copper ore containing 1.1% copper as carbonates and silicate and with some other metal oxides.

Nov 08, 2012· Pressure leaching of zinc silicate ore in sulfuric acid medium. Pressureleaching zincsilicate ore sulfuricacid medium LI Cun-xiong(), XU Hong-sheng(), DENG Zhi-gan(), LI Xing-bin(), LI Ming-tin(), WEI Chang( EnergyEngineering, Kunming University Technology,Kunming 650093, China Received July2009 ...

The present work is concerned with the kinetic study of pressure leaching of zinc silicate ore in sulfuric acid solutions. The effects of leaching temperature, particle size, sulfuric acid concentration and agitation speed on the zinc extraction were evaluated. The results obtained show that the zinc extraction increases with increasing sulfuric acid concentration and leaching temperature.

Jul 01, 1997· Bacterial leaching of uranium ore in shaking flasks. Extraction of uranium during leaching with T. ferrooxidans, T. thiooxidans, and a mixed culture of both strains. (Particle size <600 μm, pulp density 5% (w/v)) ... In the case of oxide, carbonate and silicate ores limits are set for the use of thiobacilli. For such ores, research is being ...

Mar 03, 2018· HCl-CaF2 Leaching. A preliminary experiment employing HCl and CaF2 to leach the manganese silicate ore indicated that extraction of Mn was possible. Approximately 90 pct of the Mn was extracted when a 9-pct ore slurry was leached with a 2.0M HCl-0.25M CaF2 solution at 50° C for 1 h.

If the main gangue in nickel-copper sulfide ores or precious metals sulfide ores is serpentine transformed from primary silicate minerals, it is difficult to get a high quality concentrate with lower MgO content that is suitable for smelting by physical mineral processing only such as floatation. This thesis put forward a new method to process this kind of ores.

The surface of the ore particle the total volume of the adsorbed gas when after chemical treatment shows the effect of the prp 0 f 1, leaching attack and presents some large pores that the gas volume obtained by using the cumula- were probably occupied by the MnO 2 ore before the tive desorption method. leaching process: it seems like a pitting ...

Limonite type laterites (or oxide type) are highly enriched in iron due to very strong leaching of magnesium and silica. They consist largely of goethite and contain 1-2% nickel incorporated in goethite. Absence of the limonite zone in the ore deposits is due to erosion. Silicate type (or saprolite type) nickel ore formed beneath the limonite ...

Mar 01, 2008· Column bioleaching of the complex sulfide ore was carried out at various temperatures (7-50 degrees C) and pH values (1.5-3.0). Column leaching at pH 1.5 and 2.0 resulted in increased acid consumption rates and silicate dissolution such that it became difficult to filter the leach solutions and for the leach liquor to percolate through the column.

the silicate structure sufficiently to enable effective leaching. The U.S. Bureau of Mines has been conducting bench- scale studies to determine the feasibility of leaching a Mn- bearing silicate ore with acid and fluoride as an alternative to extractive techniques requiring a high-temperature and energ-intensive pretreatment step.

A process flowsheet was developed that incorporated hcl-caf2 leaching, excess leach acid utilization, fluoride (f) recycle, and mn recovery. When the domestic manganese silicate ore was processed, 98 pct of the mn was extracted, 99 pct of the caf2 was reclaimed, and a leach residue was produced that passed the Environmental Protection Agency ...

Nov 16, 2020 Chemical Leaching. Chemical leaching makes use of the chemical properties of gold to leach it from ore, concentrate, or tailings. This process is mostly used in large scale mining operations but has been increasingly adopted in small scale mining because of its high gold recovery rate and low cost. The best practices for chemical leaching are a ...

Jan 28, 2016· NICKEL LATERITE PROCESSING Atmospheric leaching F E E D Oxide ore (but, potentially, any ore type, including low grade hydrous silicate) P R O C E E S S Heat and leach H2SO4 Ore preparation Acid plant or excess from HPAL S Energy Wash/neutralize SX-EW or precipitate P R O D U C T Ni (Co) hydroxide ~80-90% recovery Ravensthorpe, Gag Island ...