fine grind copper ore leaching kinetics

GLYCINE AS A LIXIVIANT FOR THE LEACHING OF LOW GRADE ...

Also, there are no publications on the leaching kinetics of any copper minerals in the alkaline glycine system. Low grade coppergold ores have not – been leached in the proposed lixiviant system in order to establish the influence of process variables on copper and gold leaching and the deportment of impurity metals . Furthermore, no data has ...

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The Grinding Fineness

 · Cyanide leaching process is one of the common gold ore beneficiation processes. The process index depends on factors such as gold particle size, sulfide content, ore block size, leaching speed, leaching time, cyanide concentration and leaching slag washing degree. The factors that affect gold leaching include grinding fineness, pH, temperature, cyanide dosage, pulp-solid-liquid ratio, leaching ...

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Determination and scale-up of the milling parameters of a ...

The leaching kinetics of oxidised copper-cobalt ores strongly depends on the feed particle size distribution [4]. Leaching processes of oxidised copper-cobalt ores are highly favoured by a fine grinding, usually 65 - 70 % less than 75 microns. For a high talc-

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Potential metallurgical treatment of

Leach tests were conducted in the 1-litre thermostated reactor containing NaClO solution mechanically stirred at 500 r/min. Leaching temperatures were in the range 25–60°C, and time intervals up to 120 minutes. The leaching kinetic experiments were performed at nearly constant hypochlorite concentration

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Kinetics of chemical leaching of chalcocite from low-grade ...

Kinetics of the chemical leaching of chalcocite from a low-grade copper ore in a ferric sulfate medium was investigated using the constrained least square optimization technique. The experiments were carried out for different particle sizes in both the reactor and column at constant Eh, pH, and temperature. The leaching rate increased with increase in the temperature.

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New Processes for Cleaning Up Copper Concentrates | E & MJ

The patented process is said to cost-effectively overcome the slow leach kinetics and poor copper recoveries commonly experienced with ferric sulphate leaching due to surface passivation issues. Tests indicate about 68% of the sulphur reports as elemental to the residue with the remainder as sulphate.

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A novel sequential heap leach process for treating crushed ...

exacerbated by the slow leaching kinetics of Pt. This present study applies the process, with some modifications, to coarse ore particles and focuses on the influence of ore particle size on the performance of the process. 2.0. Materials A bulk sample of Platreef drill core ore, crushed by by high pressure grinding rolls (HPGR) at

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The method of underground leaching copper sulfide ores

In the leaching of sulfide-bearing ores with sulphuric acid solutions fully and with relatively high kinetics involves leaching of copper from its oxidized minerals - malachite [Cu 2 (OH) 2 CO 3], azurite [Cu 3 (OH) 2 (CO 3) 2] and grisoli (CuSiO 3 2H 2 O), albeit with less intensity, according to the following chemical reactions:

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Design of Copper Hydrometallurgy Plants for High Grade ...

Copper Ore or Concentrate. Leaching of High Grade Ores and Concentrates ... • Fine grind to P80 of less than 10 μm (mineral leaches before passivation) • Use high temperature (+200 C) or aggressive ... • Ag often forms Ag-jarosite under copper leaching conditions. May have to use lime boil to

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FLOWSHEET DEVELOPMENT FOR GOLD OREBODIES

advantageous when the leaching kinetics are fast and when the ore contains mineral phases that are able to re-adsorb the gold cyanide in competition with activated carbon (preg-robbing). CIP is a more efficient process for slower-leaching gold ores, and has certain other advantages over CIL, such as smaller carbon elution and regeneration circuits.

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THE MECHANISM OF BORNITE LEACHING: INSIGHTS FROM ...

increasing demand of copper, it is important to be able to effectively extract copper from its ores. But the majority of the current reserves for copper minerals are hovering to low grades. Heap leaching is a well-established extractive metallurgy for the processing of various low-grade ores.

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HEAP LEACHING TECHNIQUE in MINING

metal ores (<1% copper, <1g/ton gold, < 0.5% nickel) previously considered uneconomical, became feasible with introduction of heap leaching technologies (Marsden, 2009). In consideration of ore types, a generalized diagram showing the applicable ore beneficiation technologies for oxide and sulphide ores versus ore grade is given in Figure 2.

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The kinetics of chalcopyrite leaching in alkaline glycine ...

 · Assuming that the ultra-fine grinding of chalcopyrite in order to obtain the −10 µm fraction might have caused mechano-chemical activation of the mineral specimen that is significant enough to alter the leaching kinetics as shown in Fig. 3, an investigation into the effect of temperature on the −10 µm size fraction is warranted in order ...

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LEACHING KINETICS OF CU, CO, ZN, PB AND FE FROM …

3.1 Leaching kinetics of Cu Figure 2: Plots of 1st order reaction rate constants of Cu versus temperature. Figure 2 is an example of Cu kinetics which was achieved by leaching the ''as received'' slag. The plot of k versus temperature in Figure 2 shows that there is a decrease in reaction rate with an increase in temperature.

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STUDIES ON THE CURING AND LEACHING KINETICS OF …

accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions already begin prior to irrigation of the heap, transforming the initial copper species into new copper species

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Experimental work in treating a gold

copper by leaching methods. The two standard methods of ob­ taining contact between the solvent and'' the oxidized copper minerals; of the crushed ore are percolation and mechanical agitation. In the former the particles of ore are relatively coarse and the solvent percolates through the bed of crushedw. ore.

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Big Guns in Copper Conc Leaching Race

cathode copper from chalcocite ore by ferric leaching and low pressure oxidation. It incorporates a moderate feed grind of 75-106 microns, and copper recovery is by conventional SX/EW. Future plans include the treatment of chalcocite concentrates from lower grade ore, and the further development of the process to treat chalcopyrite concentrates ...

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Studies on the curing and leaching kinetics of mixed ...

Heap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom. This technique involves complex chemical/electrochemical reactions and transport processes. Among the main features of this method …

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Kinetics of chalcocite leaching in oxygenated alkaline ...

 · Under all conditions, the copper leach rate was very rapid in the first 6 h of leaching after which significant slower rates were recorded. The influence of fine grinding P 100 –20 μm was remarkable with up to 78% Cu extracted over 6 h of leaching as compared to just 40% for 38–53 μm size fraction under the same conditions. SEM-EDS and ...

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Acid Leaching

 · PREPARATION OF THE COPPER ORE. This study is limited in general to percolation leaching as it is the most widely used method to give proper contact of solvent with the ore to effect extraction of the copper. One of the important factors in percolation leaching is the size reduction necessary for copper recovery within reasonable time limits.

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LEACHING KINETICS OF COPPER FROM CHALCOPYRITE …

LEACHING KINETICS OF COPPER FROM CHALCOPYRITE CONCENTRATE IN NITROUS-SULFURIC ACID ... more efficient mills for the fine or ultrafine grinding of sulfides have made ... dilute nitric acid mixture to leach silver- and copper-bearing ores (Caldon, 1978).

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Enhancement of copper dissolution by mechanochemical ...

Abstract In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimental-simulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding. The effect of milling was studied by scanning electron microscopy (FE-SEM ...

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Grind Optimization of Konkola Blended Copper Ore

 · Konkola West Concentrator stockpile handles 55000 tonnes copper ore per day producing an average of 400 tonnes of concentrate. The grade of the concentrate is 36 to 40% TCu. The plant efficiency (recovery) is at 89% TCu. The concentrator operations include: Primary, secondary and tertiary crushing, grinding, flotation, dewatering and tailings disposal.

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Enhancement of copper dissolution by mechanochemical ...

N2 - In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimental-simulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding.

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A New Collector for Effectively Increasing Recovery in ...

 · At present, the on-site control grinding fineness of Dishui Copper Processing Plant is about 90%. The multi-sampled and sieved grinding products show that the +74 m copper grade is the highest, generally above 0.30%, but the 25 m slime content is more than 60%, which not only causes a …

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Gold Recovery 101

whole ore leaching impractical or uneconomic. The ultra-fine gold particles associated with sulfide minerals are often too small to recover by gravity and very expensive to liberate by grinding. Typically, sulfide-associated gold is recovered by froth flotation. A typical sulfide-associated gold flowsheet is presented below in Figure 2:

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US7846233B2

A method of leaching copper from copper sulphide-containing concentrates, such as chalcopyrite, includes using pyrite as a catalyst for ferric reduction in order to eliminate passivation of the chalcopyrite surface, the process being carried out under conditions whereby the pyrite is not materially oxidized, for example by maintaining the operating solution potential at a suitable level.

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Improved leach recovery

In simple leaching circuits the purpose of grinding is liberate the particle and expose fine grained minerals to leachant (e.g. exposing fine gold to cyanide). In more complex leach environments such as those treating refractory ore bodies the "refractory" minerals can be passivated by reaction products forming a 2-3 micron "rim" on the particle.

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(PDF) Leaching Kinetics Of Copper From Chalcopyrite ...

Leaching kinetics of copper from chalcopyrite concentrate in nitrous-sulfuric acid. 411. The leaching of chalcopyrite concentrate with a particle size of 15 μm in nitrite -. containing solutions ...

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Options to Treat Refractory Ores

The slow leaching kinetics of at least half the silver ... determining the mill sizes and power for the ore grinding circuits. For Ore A a Bond ball mill work index value of 17 kWh/t was reported. For ore B a Bond ball mill work index value of 15 kWh/t was ... Further work investigating fine grinding and a cleaning may improve recoveries, but ...

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Copper recovery using leach/solvent extraction ...

leaching of high-grade copper oxide ore followed by EW of copper from the leach solution, produced low quality copper cathode at relatively high cost. In 1968 the tonnage of high-grade oxide ores was decreasing and vat leaching was on the decline. The second process, heap and dump leaching of low-

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Kinetics of leaching of covellite in ferric-sulfate ...

Hydrometallurgy methods to extract copper are becoming more frequently applied in modern industry. However, the leaching kinetics for certain minerals like covellite is poorly understood. This thesis investigates the kinetics of covellite leaching in a ferric-sulfate-sulfuric acid media, with an emphasis first placed on the understanding of the effect of the most common variables such as ...

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Heaps and extracts

doping accelerated the leach kinetics of the chalcopyrite and could significantly shorten the required residence time within the total leach circuit significantly. "Other technologies have relied on fine grinding to increase the surface area of the particles. While fine grinding is effective, it also requires a lot of energy. We needed to come up

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Chalcopyrite Sulfuric Acid Leaching Kinetics

 · Iron and copper additions resulted in rapid conversion of chalcopyrite to chalcocite increasing the rate of reaction to that of the intermediate chalcocite formed. Chalcocite kinetics show a strong pH dependence, while chalcopyrite kinetics are essentially independent of pH between 1 and 2.5.

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HEAP LEACHING Experience-based approach to successful …

silver, copper, nickel, zinc and uranium. The ore can be processed as coarse rock, normally referred to as a dump leach, or as a crushed ore in a heap leach. The reagents used and the chemistry of leaching are metal specific, but the basic principles are similar to all ore types. At first glance, heap leaching …

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