First, 200 mL of the leaching agent was prepared using H 2 SO 4 and deionized water, and poured into a three-necked round-bottom flask. The leaching agent was heated to the desired temperature. Then, the copper tailings were added into the flask at the set speed. At the desired time interval, 4 mL of the solution was removed and filtered.
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11.1.1.3 Percolation Leaching. It is adopted for crushed ore of 6 to 10 mm size placed in large tanks by percolating a number of solutions in increasing concentration. For effective leaching, the ore should be course enough so that the leaching solution can move freely through the voids.
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The composition of MgSO 4 leaching solution of ion-absorbed clay ores is shown in Table 2. A large amount of precipitates were produced when contacting 20 mL MgSO 4 leaching solution with the saponified extractants (L/S = 450/1). After liquid/solid centrifugal separation, the concentrations of RE in the raffinates of PPBOA, OPBOA and …
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The optimum alkaline leaching conditions of 5% NaOH, temperature 90 to 95 °C in 90 min was obtained for leaching zinc from an oxide ore 17. The column leaching of low grade zinc oxide ore ...
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DAWSON J N, LA BROOY S R, RITCHIE I M. Copper–gold ore leaching: A kinetic study on the ammoniacal cyanidation of copper, chalcocite and chalcopyrite [C]//Proceedings of The AusIMM Annual Conference. ... The cyanide leaching of gold in solutions containing sulfide [J] Minerals Engineering, 13 (10–11) (2000), pp. 1097-1106. …
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A leaching process to solubilize minerals from host rocks without removing the desired mineral from the ore body. • Vat leaching – Crushed ore/concentrate in submerged leach solution – The crushed materials collected in concrete vats. The solution percolates through the ore mass, overflows from a designed and pumped to the next vat.
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The Leaching process is a universal process – Water will leach the components of any material it comes in contact with, from its surface or the interior of the material (based on the porous nature of the material). Using this process, the ore of metal can be concentrated by causing a chemical reaction with a reagent which would lead to the ...
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Copper dissolutions using water and sulfuri c acid as a leaching solution (Figure 4) were 64.62%, 76.26%, and 76.56% after 50 h for the three conditi ons, respectively. Meanwhile, copper ...
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Iron, as a dominant ore component by far, is the main interfering factor in the extraction processes of Ni and Co in rather low amounts from leaching solution. The leachate examination results were compared to separate model solutions, as well as to their combinations in concentrations and to pH values comparable to those of the leachate.
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BASF technology developed to increase metal recovery from heap and dump leach processes The ever-increasing demand for minerals and metals is driven by …
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The resulting ore blend was agglomerated with raffinate (leaching solution) at a gravimetric water content (GWC) of 0.06 g/g and concentrated sulfuric acid at 6 kg H2SO4/ton of ore. ...
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A leach solution is circulated down through a fractured ore body to dissolve the values and is then pumped to the surface, where the values are precipitated. Heap leaching of gold ore. Earth movers preparing the heap (background) and the drainage …
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There are some processes for the transformation and enrichment of Bayan Obo mixed type RE ore leaching solution. As shown in Fig. 2, the developed process in this study consists of two parts, i.e., (1) Selective separation of rare earth, calcium and magnesium from the leaching solution of Bayan Obo mixed rare earth ore by …
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An effective method for recycling REES and Al from ion-absorption rare-earth ore in order to obtain ore leaching solutions was also reported. Zeng et al. (2012) and Han et al. (2013) proposed a method which had adopted a saponifying naphthenic acid extraction system for aluminum removal. It was found that the system had the ability to remove ...
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In HL mined ore is crushed into small chunks, or ground and agglomerated into quasi-uniform particles, and heaped on an impermeable plastic and/or clay lined leach pad where it is irrigated with a leach solution which contains an appropriate leaching agent. Then, the solution percolates through the heap and leaches out the value metal.
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Column testwork on run of pad ore composites has shown that varying the solution application rate from .005 gpm/ft² to .001 gpm/ft² has no effect on the overall silver or gold extraction after a short period of time of 2-3 weeks. The pregnant solution grade is inversely proportional to application rate leading to like extraction values.
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constructed to allow spent ore to be removed after the leaching cycle and re-use of the pad (Lopes and Johnston 1988). The reaction of the cyanide solution with the free gold is oxygen-dependent. Therefore, the solution is oxygenated prior to application or during spraying. The solution concentration is generally between 0.5 and
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Heap Leach Pad Design. Because flow is downward in percolation leaching, the leach pad is the most important element of the solution containment system.The leach pad supports the ore heaps, collects solution flowing through the heaps, transports the solution laterally to drainage pipes or ditches, and prevents toxic or hazardous …
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Because a volume of ore drains out to a final moisture independent of leach solution application rate, a lower application rate allows for more volume of ore to be …
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The leach solution is applied on the top of the heap with sprinklers or drippers, and trickles through the ore bed through channels and pores. The pregnant …
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Disclosed is a method for the homogeneous precipitation separation of iron and aluminum from a laterite nickel ore acid leaching solution, wherein the present invention belongs to the technical field of nonferrous metal wet metallurgy. The present invention comprises: finely grinding calcium carbonate or magnesium carbonate and mixing same with water …
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Improving the seepage of leaching solution in the ore body and strengthening the mass transfer process of rare earth ions during in-situ leaching are two critical methods to improve the leaching efficiency of rare earth. In this study, 2 wt% MgSO 4 solution was used for the indoor simulated column leaching experiment on rare earth …
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The relatively smaller effect arising from addition of the fresh solution later in the leaching process could be attributable to a variety of issues, e.g. residual poorly leachable uranium minerals, or leach solution not accessing uranium ore, either due to its location in the agglomerated particles or hydrodynamic issues such as leach solution ...
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The acid strength of the leach solution varies proportionately with the rate of leaching,-the grade of the copper ore leached, and the amount of acid-consuming gangue present in the ore.10 The pregnant liquors produced by heap leaching are generally much higher in copper content than those produced by dump leaching because ore grades are higher ...
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Abstract. To establish a cleaner production technology of chromium salt, the pressurized leaching process of in 60 wt% NaOH solution, subsequent separation of a chromium salt from the leached solution and Cr from chromite ore was established. The results showed that the decomposition of chromate ore could be significantly improved …
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As shown in Figure 1, according to the ionic rare earth leaching kinetics of related research [28, 29], ionic rare earth leaching process, the leaching agent (taking magnesium sulphate solution as an example) first contacts with the liquid film layer on the surface of the rare earth ore particles. The magnesium ions in the leaching agent ...
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Three sets of experiments were performed in order to study the influence of time on leaching efficiency of manganese ore. The ore sample was treated for 1 h, 2 h and 3 h at constant sawdust amount 5 g, sulfuric acid …
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A sodium cyanide solution is commonly used to leach gold from ore. There are two types of leaching: Heap leaching: In the open, cyanide solution is sprayed over huge heaps of crushed ore spread atop giant collection pads. The cyanide dissolves the gold from the ore into the solution as it trickles through the heap.
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Hydrometallurgy - The treatment of ore by wet processes, such as leaching, resulting in the solution of a metal and its subsequent recovery. Hydrothermal - Relating to hot fluids circulating in the earth's crust. I. Igneous rocks - Rocks formed by the solidification of molten material from far below the earth's surface.
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The optimum conditions for leaching metals from laterite ore using ferric chloride solution were found to be as follows: Fe 3+ concentration in the lixiviant of 178.9 g/L, L/S of 1.0, leaching temperature of 150 °C, and leaching time of 1.5 h. Under these conditions, 82.8% of the Ni and 86.1% of the Co were leached, with 87.4% of the Fe in …
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1. Apply two drops of leaching solution to a sample collector tip. 2. Apply a very small amount of fine particles of the target material (ground paint chips, paint dust, house dust, …
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Fig. 1a: Industrial Column Leaching – Oxide Ore Leach time is 70% of control 34% more copper leached 28ppm LixTRA™ Control Results From Figure 1 (a-d) the beneficial effect of using LixTRA™ can be observed when leaching; a) an oxide ore b) a secondary sulfide ore, c) a mixed oxide/primary sulfide ore and d) an
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Next, a concentrated leaching solution is mixed with the ore in a rotating drum until the ore contains 10 pct of solution. The ore is then placed in piles while the solution reacts with the ore. After 24 h the ore is transported to an impervious pad, where it is spread out in layers approximately 3 ft (1 m) deep. The ore is then sprayed with ...
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This was the first commercial method used for gold extraction. Place the ore into the mortar and grind it to the size of sand grains. Put the ore grains into a plastic bowl. Add the 35-percent hydrochloric acid to the sodium hypochlorite bleach into a flask or beaker, in a two-to-one ratio of acid to bleach. Ensure that the liquid mixture is at ...
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The leaching yield of gold was calculated from the gold mass in both the culture solutions and original ore sample. The leaching yields of the culture solutions of strains a-1, e-2 and f-1 were 92 ...
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