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The use of this biochemical method in the copper leaching process resulted in a significant reduction in sulfuric acid consumption, by 40%, and a copper recovery rate of 87.2%.
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This well-researched process recovers copper cyanide as a precipitate after cyanide leaching. This can be of benefit in those gold- and copper-bearing ores where the copper can interfere in …
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etc. The test has been used successfully in laboratory situations for gold, silver and uranium ores in alkali conditions as well as copper (Efthymiou et al., 1998), nickel and uranium ores in acid …
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Abstract. The general feasibility of ammoniacal percolation leaching of copper sulphide ores has been demonstrated. The rates are comparable to those of conventional ferric sulphate …
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The usual commercial practice in leaching copper ores consists of: (1) Crushing the ore to pass through a screen with approximately one-quarter or one-third inch openings; (2) charging the …
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The leaching rate for copper ore was increased from 50% to 60% by adding surfactant into the leaching solution. According to the figure, addition of surfactant improved …
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heap leaching, copper, chemolithotrophic bacteria, sulphuric acid leaching, bacterial leaching, bioleaching. The article describes results of research on copper recovery from low …
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Further than copper oxide, uranium, and gold, today there are an extensive variety of applications, including copper sulfide ores, gold-bearing pyritic ores, and non-metallic …
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The current state and future directions of percolation leaching in the Chinese mining industry: challenges and opportunities. Miner. Eng., 125 ... Evaluation of stucco binder …
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Heap leaching (including bioleaching) is widely used for the treatment of low-grade copper ores [15,19], and the possibility of using it for Cu-Ni ore was also studied on an …
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the acid generated in EW is recycled back to the percolation leach via SX. Figure 3 The Process Cycles Common to all Forms of Percolation Leaching 1.3. Nomenclature Percolation leaching …
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Inplace leaching techniques are applicable to leaching oxide and sulfide ores of copper and other metals. The basic principles involved are similar to those for dump or heap leaching. The leach solutions must pass downward …
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Sulphuric acid agitation and column leaching tests of an oxidised copper-cobalt-bearing ore (1.44% Cu and 1.04% Co) were performed to investigate its amenability to copper …
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Heap leaching of copper oxide ores usually incorporates the use of sulphuric acid (H 2 SO 4) and water to bind fines to larger ore particles during the agglomeration process. In addition, the …
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The usual commercial practice in leaching copper ores consists of: (1) Crushing the ore to pass through a screen with approximately one-quarter or one-third inch openings; (2) charging the …
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The effect of acid dosage to ore agglomeration in the leaching of a copper oxide ore was investigated in 1 m column leach tests at 24, 48 and 71 kg H 2 SO 4 /t. The primary objective …
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Percolation Leaching of a Chalcopyrite ... Dump or heap leaching of copper ores is an important supplement to open pit mine production of copper and provides about 11 pct of the total copper …
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Heap leaching may be defined as the percolation leaching of piles of low-grade ores or mine waste that have been stacked or piled on specially prepared watertight drainage pads for pregnant liquor collection. This …
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The principal methods of leaching copper ores at the present time are heap, dump, in-place, and vat. A number of references are presented in the bibliography on the theoretical and practical aspects of these methods. ...
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The ore block, which has been fractured by lateral drilling and controlled blasting to open-up fissures to allow percolation of liquors, ... (shown schematically in Fig. 1) involved a …
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applied the mixed kinetics model to the leaching, by percolation method, of low-grade chalcocite-covellite ore using sulfuric acid as lixiviant.Few studies have been done on the leachability of …
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Figure 3 The Process Cycles Common to all Forms of Percolation Leaching In modern copper recovery via SXEW the copper is extracted and replaced with hydrogen ions resulting in a …
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In percolation leaching, the lixiviant percolates by gravity through the metalliferous mass which remains static. In general, the ore is arranged in heaps, trays or columns. ... The …
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The copper yield was 47 % at using conventional sulfuric acid leaching, while utilizing bacterial leaching increased the copper recovery up to 86 % during 90 days of the …
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It was found that the rate of leaching of copper ore with hydrochloric acid or sulfuric acid, increases with temperature and acid concentration, while it decreases with increasing particle size.
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Mineral leaching is the key unit operation in metallurgical processes and corresponds to the dissolution of metals. The study of leaching is carried out in many areas, …
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The results of the percolation leaching experiments showed that the most rapid increase in copper recovery occurred in the first ten days for the Sayak and Bayskoye ore …
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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 …
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The types of percolation leaching with a summary of typical criteria are given in Table 1. ... processed, and ma y consist of a strong acid (typically, sulphuric acid for copper or …
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The percolation leaching process results, including the calculation of sulfuric acid consumption per ton of ore, the consumption ratio of sulfuric acid and extracted copper, and …
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