The kinetics of chalcopyrite leaching in alkaline glycine

May 01, 2019Assuming 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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Cited by: 7

Effect of Ultrasound on the Oxidative Copper Leaching from

The objective of this study is to compare the reaction kinetics of copper leaching from chalcopyrite in acidic ferric sulfate media with (UAL) and without (non-UAL) ultrasound assistance. Four leaching parameters were evaluated and optimized. The parameter with the strongest effect was temperature, followed by ultrasonic power, the solid-to-liquid ratio (S/L), and acid concentration.

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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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Open Access The Leaching of Dolomitic-Copper Ore Using

pressed air leaching in pachuca tanks is the most common method for leaching copper ore [7-9]. Non-oxidative leach-ing of copper in the absence of oxygen has been studied elsewhere [10]. The temperature of the reaction has an effect on the rate of leaching according to Arrhenius Law [3]. Since the leaching of copper is dependent on effective

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The kinetics of chalcopyrite leaching in alkaline glycine

Recent research indicated the potential of glycine under alkaline conditions as a lixiviant for copper from its ores and concentrates. In this research, a systematic study has been made of the effects of glycine concentration, temperature, dissolved oxygen, particle size, stirring speed, on the leaching kinetics of chalcopyrite in alkaline glycine from which a power law rate model has been

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Cited by: 7

INVESTIGATION OF LEACHING BEHAVIOUR OF PRE

Kinetic analysis revealed the activation energy to be 48.3 kJmol-1-and 71.3k Jmol 1, this suggests the dependence of the leaching process on surface chemical reaction. KEYWORDS: Pre-concentration, Sensor-based, Copper ore, Leaching, Ammonium chloride Introduction Copper metal combines with a

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Improved leach recovery IsaMill™ Advantages Isamill

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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Effect of Ultrasound on the Oxidative Copper Leaching from

The objective of this study is to compare the reaction kinetics of copper leaching from chalcopyrite in acidic ferric sulfate media with (UAL) and without (non-UAL) ultrasound assistance. Four leaching parameters were evaluated and optimized. The parameter with the strongest effect was temperature, followed by ultrasonic power, the solid-to-liquid ratio (S/L), and acid concentration.

get price

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).

get price

The kinetics of chalcopyrite leaching in alkaline glycine

Recent research indicated the potential of glycine under alkaline conditions as a lixiviant for copper from its ores and concentrates. In this research, a systematic study has been made of the effects of glycine concentration, temperature, dissolved oxygen, particle size, stirring speed, on the leaching kinetics of chalcopyrite in alkaline glycine from which a power law rate model has been

get price

Copper Mining and Extraction Sulfide Ores

Ores near the surface can be quarried after removal of the surface layers. The ore is treated with dilute sulfuric acid. This trickles slowly through the ore dissolving copper to form copper sulfate. The copper is recovered by electrolytic refining. Advantages of this process are: See for further information on the leaching process.

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copper ore leaching in south africa

Comparing the extent of the dissolution of copper-cobalt ores from The Central African Copperbelt hosts 40% of the world''s cobalt reserves and 10% of the world''s copper reserves. The leaching behaviour of a copper-cobalt oxide ore in an organic acid .. Wasay, S.A., Barrington, S., and Tokunaga S. 2001. Get price

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INVESTIGATION OF LEACHING BEHAVIOUR OF PRE

Kinetic analysis revealed the activation energy to be 48.3 kJmol-1-and 71.3k Jmol 1, this suggests the dependence of the leaching process on surface chemical reaction. KEYWORDS: Pre-concentration, Sensor-based, Copper ore, Leaching, Ammonium chloride Introduction Copper metal combines with a

get price

Improved leach recovery IsaMill™ Advantages Isamill

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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gold ore leaching process in south africa 」

Gold and Silver Leaching by Cyanidation. Introduction to Gold and Silver Leaching. The cyanide leaching process is the most important method ever developed for extracting gold from its ores. The early development of the process is attributed to a Scotchman, John Stewart Mac Arthur, in collaboration with the Forrest brothers.

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(PDF) Ammonia Leaching: A New Approach of Copper Industry

Since that time, a large number of studies have been carried out to study the kinetics of leaching various copper ores and copper-containing wastes in ammonia media at atmospheric [27][28][29][30

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RECOVERY OF COPPER FROM OXIDE COPPER ORE BY

RECOVERY OF COPPER FROM OXIDE COPPER ORE BY FLOTATION AND LEACHING Kiraz, Emirhan M.S., Department of Mining Engineering Supervisor: Prof. Dr. Mustafa Ümit Atalay December 2014, 65 pages The aim of this study was the recovery of copper from the oxide copper ore by froth flotation and agitating sulphuric acid (H 2 SO 4) leaching.

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Effect of microwave pretreatment on grinding and flotation

The present work initially studies the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. The kinetics tests were carried out on the untreated and microwave irradiated samples by varying the exposure time from 15-150 sec. Optical microscopy, energy-dispersive X-ray spectroscopy and scanning electron microscopy were used for determining the mineral liberation

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Fine Grinding as Enabling Technology The IsaMill

kinetics and recovery, and improved leaching leaching rates and chemistry. Stirred milling was developed for fine grained ores that required an economic grind to sub 10 micron sizes.

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ALTA Gold 2012 E-Doc Home Albion Process

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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HIGMILL FINE GRINDING TECHNOLOGY OPTIMISES

Gold within the ore is very fine grained, ranging from 150um to less than 10um and commonly less than 40µm. The Cracow processing plant consists of a three-stage crushing circuit, primary and secondary ball milling, pre-leach thickening, fine grinding and conventional cyanidation leaching (CIP). CHALLENGES • Optimise gold recovery

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Copper Mining and Extraction Sulfide Ores

Ores near the surface can be quarried after removal of the surface layers. The ore is treated with dilute sulfuric acid. This trickles slowly through the ore dissolving copper to form copper sulfate. The copper is recovered by electrolytic refining. Advantages of this process are: See for further information on the leaching process.

get price

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).

get price

copper ore leaching in south africa

Comparing the extent of the dissolution of copper-cobalt ores from The Central African Copperbelt hosts 40% of the world''s cobalt reserves and 10% of the world''s copper reserves. The leaching behaviour of a copper-cobalt oxide ore in an organic acid .. Wasay, S.A., Barrington, S., and Tokunaga S. 2001. Get price

get price

INVESTIGATION OF LEACHING BEHAVIOUR OF PRE

Kinetic analysis revealed the activation energy to be 48.3 kJmol-1-and 71.3k Jmol 1, this suggests the dependence of the leaching process on surface chemical reaction. KEYWORDS: Pre-concentration, Sensor-based, Copper ore, Leaching, Ammonium chloride Introduction Copper metal combines with a

get price

Effect of microwave pretreatment on grinding and flotation

The present work initially studies the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. The kinetics tests were carried out on the untreated and microwave irradiated samples by varying the exposure time from 15-150 sec. Optical microscopy, energy-dispersive X-ray spectroscopy and scanning electron microscopy were used for determining the mineral liberation

get price

HIGMILL FINE GRINDING TECHNOLOGY OPTIMISES

Gold within the ore is very fine grained, ranging from 150um to less than 10um and commonly less than 40µm. The Cracow processing plant consists of a three-stage crushing circuit, primary and secondary ball milling, pre-leach thickening, fine grinding and conventional cyanidation leaching (CIP). CHALLENGES • Optimise gold recovery

get price

gold ore leaching process in south africa 」

Gold and Silver Leaching by Cyanidation. Introduction to Gold and Silver Leaching. The cyanide leaching process is the most important method ever developed for extracting gold from its ores. The early development of the process is attributed to a Scotchman, John Stewart Mac Arthur, in collaboration with the Forrest brothers.

get price

RECOVERY OF COPPER FROM OXIDE COPPER ORE BY

RECOVERY OF COPPER FROM OXIDE COPPER ORE BY FLOTATION AND LEACHING Kiraz, Emirhan M.S., Department of Mining Engineering Supervisor: Prof. Dr. Mustafa Ümit Atalay December 2014, 65 pages The aim of this study was the recovery of copper from the oxide copper ore by froth flotation and agitating sulphuric acid (H 2 SO 4) leaching.

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Heaps and extracts ALTA Metallurgical Services

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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ALTA Gold 2012 E-Doc Home Albion Process

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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The Alteration Mechanism of Copper-bearing Biotite and

Oct 21, 2019The copper deposits in the world are widely distributed across five continents including more than 150 countries 1.According to the proportion of oxide minerals and sulfide minerals in copper ores

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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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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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The Case for Glycine Heap Leaching

Project Target 2 Gold ore with nuisance copper. Gold ores with elevated or ‘nuisance’ copper levels are difficult to process by conventional cyanide heap leaching, as the copper causes high cyanide consumption. As well as the direct cyanide cost, this increases the cost of detoxifying effluent solutions.

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