ore leaching silicate

ore leaching silicate

CaF2 Enhanced HCI Leaching of a Manganese Bearing

CaF, ENHANCED HCI LEACHING OF A MANGANESE BEARING SILICATE ORE By P. ~omlaa,' K. P. V. ~ei,* and T. G. carnahan3 ABSTRACT The U.S. Bureau of Mines investigated a hydrochloric (HC1) calcium fluoride (CaF,) leaching procedure to treat domestic manganese (Mn) bearing silicate

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silica ore leaching costsale riversidevets

The obtained results show that the acid leaching of zinc silicate ore under pressure was found to be more efficient compared to other zinc hydrometallurgical process in terms of decreased dissolution of silica and iron and increased zinc extraction. Read More.

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Processes for phosphorus removal from iron ore a review

Alkaline leaching is effective for removal of the phosphorus present in apatite and silicates; Acid leaching is the most efficient method for removal of phosphorus from iron ore. Among the tested acids, sulfuric acid is the most effective for this purpose. The leaching time is low (~20 minutes) and the iron loss is negligible (less than 0.25%).

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Kinetics of sulfuric acid leaching of low grade zinc

Leaching represents the first step of the hydrometallurgical route and the leaching kinetics is very important for economic metal extraction. The processing of zinc silicate ores is becoming more attractive due to the depletion of zinc sulfide ores as well as the restriction on sulfur emissions during their processing , . In industry, the leaching process is performed in a cascade reactor unit comprising two stainless steel

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(PDF) The kinetics of zinc silicate leaching in sodium

Abdel Aal (2000) also studied the leaching of a zinc silicate ore containing willemite and The morphology of the zinc silicate concentrate before and during hemi morphite as major zinc phases and observed that increasing the leaching was examined by SEMEDS and is presented in Fig. 6.

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Lateritic nickel ore deposits

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 zone. It contains generally 1.5 2.5% nickel and consists largely of

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Heap Leaching Software 911metallurgist

Coarse ore leaching includes both heap and dump leaching. The terra heap leaching will be used in this paper to mean any type of coarse ore leaching. The results of their work are generally in agreement the progress of leaching can be described by the shrinking core model and its associated mathematics. A software package has been developed to preform the calculation necessary for both gold heap

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Leaching of rare earths elements (REE) past and present

leaching technologies, both past and present, used in primary REE production. Bastnaesite Bastnaesite is a rare earth fluorocarbonate mineral1, RE(CO3)F, which primarily contains light rare earth elements. After physical upgrading, bastnaesite ore concentrates contain between 40 to 60% REE2.

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CA2440858A1 A method for the precipitation of silica in

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 precipitated as silica.

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US Patent for Chemical dissolution of scale formed during

In the high pressure sulfuric acid leaching of nickeliferous oxide and silicate ore, there is a tendency for the formation of scale on autoclave surfaces. The scale comprises oxides and sulfates of metals selected from the group consisting of aluminum, iron, silicon and magnesium. The scale is chemically removed by flushing the autoclave following completion of a leaching regime with a

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WO2002072896A1 A method for the precipitation of silica

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

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Zinc Silicate and Carbonate Leaching Process Outotec

Outotec's zinc silicate and carbonate leaching process provides high zinc recovery while still controlling silicon leaching and the removal of silica. After leaching, iron removal and solution purification or zinc solvent extraction steps produce a solution suitable for zinc

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Characterization and Flotation of Sulfur from Chalcopyrite

The chalcopyrite leaching residue used in this study was produced from a chalcopyrite concentrate leaching similar to the leaching circuit of the Cuprex process [9]. The leaching conditions are two stage countercurrent leaching with 6 hours of retention time on each stage, leaching temperature of 95oC, and 2.0 moles per liter of ferric chloride. The copper

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Kinetics of sulphuric acid leaching of a zinc silicate calcine

a zinc silicate ore containing hemi morphite (Zn 4Si 2O 7 (OH) 2183;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 40176;C to 70176;C, zinc extraction enhanced from 70 to 95%. 3.3.

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The kinetics of zinc silicate leaching in sodium hydroxide

As the leaching kinetics in alkaline medium is far less studied than in acid solutions, the purpose of the present work is to assessthe leaching kineticsparametersof a zinc silicate ore in sodium hydroxide. 2. Materials and methods The zinc silicate concentrate contains 3439% Zn (Table 1).

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LEACHING Zn FROM THE LOW GRADE ZINC OXIDE ORE IN NH3

However, alkaline leaching processing is often confronted with the problem of low grade complex ores, especially zinc silicate. The low solubility of these ores does not usually allow for the recovery of the target metal, even by direct chemical leaching in many leaching reagents (Zhao et al., 2009).

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Kinetics of Sulfuric Acid Leaching of Low Grade Zinc

With pressure acid leaching of synthetic zinc silicate, the effects of initial concentration of sulfuric acid, final pH value, iron content, added amount of aluminum sulfate and temperature on

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Uranium processing Britannica

Other uranium ores of economic importance are autunite, a hydrated calcium uranyl phosphate; tobernite, a hydrated copper uranyl phosphate; coffinite, a black hydrated uranium silicate; and carnotite, a yellow hydrated potassium uranyl vanadate.

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The kinetics of zinc silicate leaching in sodium hydroxide

zinc silicate ore in the 60 176;C90 176;C range. The results indicate that 5 h are required for the complete leaching of the ore and that zinc extraction can reach 90% at the highest temperature tested.

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Kinetics of Sulfuric Acid Leaching of Low Grade Zinc

Kinetics of Sulfuric Acid Leaching of Low Grade Zinc Silicate Ore. Moreover, as the leaching reaction proceeds under mechanical stirring and ultrasonication, the diffusion resistance through the liquid film could be eliminated, because the leaching reaction took place at higher stirring speed (750 r min 224;1 ).

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Sulfuric acid leaching of zinc silicate ore under pressure

Pressure acid leaching of zinc silicate ores selectively separates valuable zinc from silica and iron, replacing conventional pyrometallurgical and hydrometallurgical methods. This study determines the optimum conditions for the dissolution of zinc silicate concentrates and achieves a higher zinc extraction (gt; 97%), lower iron (lt; 0.77%) and silica dissolution (lt; 4%) with a high selectivity.

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The processing of zinc silicate ores A review SpringerLink

Previous processes, both pyrometallurgical and hydrometallurgical, for treating zinc silicate ores are reviewed. Some comparisons are made with the new continuous leaching process recently developed by the Electrolytic Zinc Company of Australasia Limited.

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Atmospheric pressure leaching application for the recovery

the iron is removed as the silicate phase. Nickel laterite ores may be processed by direct smelting to produce ferronickel, without the concentration stage; however, this is not a commercial practice (Norgate and Jahanshahi, 2010). Atmospheric pressure leaching has been suggested as a method of replacing high pressure acid leaching, which

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The kinetics of zinc silicate leaching in sodium hydroxide

The present work shows that the kinetics of sodium hydroxide leaching of zinc silicate is chemically controlled with an activation energy of 67.8 177; 9.0 kJ/mol. 4. Conclusions The alkaline leaching kinetics of a zinc silicate ore assaying 34.1% Zn, 11.1% Fe and 22.9% SiO 2 was studied.

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Solvent extraction in the primary and secondary processing

Following atmospheric leaching in sulphuric acid, iron, aluminium, and silica are removed from solution by precipi tation. Zinc is then selectively extracted by SX with D2EHPA, enabling the electrowinning of SHG zinc. The selection of SX as the purification step serves several purposes.

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Procedure for extraction of nickel from silicate ore by

The method of extraction of Nickel from silicate ores, including leaching solution of sulfuric acid with getting productive solutions, the removal of impurities such as iron, aluminum, magnesium and silicon, the extraction of Nickel in concentrate and return working solutions after strengthening with sulfuric acid for leaching, characterized in that the receiving productive solutions are heap or underground leaching

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HCl Hydrochloric Leaching of Manganese Silicate Ore

Results from these experiments indicated that leaching a 35 pct manganese silicate ore slurry at 50176; C with 100 pct of stoichiometric HCl (0.56 g HCl per gram of ore) and a F Mn mole ratio of 0.2 for 3 h would extract 96 pct of the Mn.

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Sulfuric acid leaching of zinc silicate ore under pressure

Dec 01, 20100183;32;Sulfuric acid leaching of zinc silicate ore under pressure This study determines the optimum conditions for the dissolution of zinc silicate concentrates and achieves a higher zinc extraction (gt; 97%), lower iron (lt; 0.77%) and silica dissolution (lt; 4%) with a high selectivity.

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CaF2 enhanced HCl leaching of a manganese bearing silicate ore

Note Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.

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CaF2 H2SO4 leaching of a manganese silicate ore.

The U.S. Bureau of Mines investigated caf2 assisted h2so4 leaching to extract mn from domestic silicate manganese resources. A pyroxmangite (mn, fe) sio3) ore containing, in pct, 34 mn, 23 si, 3 ca, and 1 fe was leached at 90 deg c for 3 h in a solution containing, in g/l,

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