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field was found to be in agreement with the flow pattern of pitched blade axialflow impellers that was used for mixing. The leaching tank exhibited good offbottom suspension which reveals mi nimum deposition of gold ore particles on the bottom of the leaching tanks. Simulation results
3Leaching and adsorption : put the slurry after decontaminated and concentrated into the highefficiency leaching tank, there are 58 tanks normally, add cyanide solution into the former two tanks, add activated carbon into the other five tanks, activated carbon adsorb gold become the loaded gold carbon, the loaded gold carbon lift into
Jan 01, 1990#0183;#32;The flow pattern of solution inside leaching tanks of the Pedro de Valdivia saltpetre plant, each with a volume of approx. 9000 m 3, was studied using tracer techniques in order to compare the flow behaviour in tanks with different this purpose, a pulse of [131 I]NaI was injected at the inlet of the tank and the residence time distribution (RTD) was obtained at the outlet
the centre, out to the wall an up the tank sides. In some leach tanks air blowers introduce air flow below the agitator blades which can cause an erratic slurry flow and inefficient mixing . In an effort to improve mixing the air flow is typically increased. In some applications increased air flow can lead to
Determination of flow patterns in industrial gold leaching tank by radiotracer residence time distribution measurement. The carboninleach (CIL) process is one the most efficient methods of gold recovery from gold bearing ores. The efficiency of the leaching process greatly depends on the flow structure created by mechanical agitation (in some cases air agitation) in the leaching tanks.
Metallurgical ContentLearn CyanidationDevelopments in the CarbonInPulp ProcessDesign Criteria Commercial Operations Cyanide is a lixiviant, or reagent that is used to leach, often in tanks, gold from a solid matrix and form a gold cyanide complex. The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon. CIL stands for carboninleach. This is a
Tank vs. vat leaching Factors. Tank leaching is usually differentiated from vat leaching on the following factors: In tank leaching the material is ground sufficiently fine to form a slurry or pulp, which can flow under gravity or when pumped. In vat leaching typically a coarser material is placed in the vat for leaching, this reduces the cost of size reduction;
Shekhar and Evans (1989) for gasliquid pattern and gas holdup in different operation and design parameters. In comparison with this data, reasonable agreements are obtained and the prediction of gasliquid flow suggests that the model can be used to improve the performance of gasagitated tanks. NOMENCLATURE
CFD codes were used to simulate the flow pattern of a representative leaching tank us ing an EulerianEulerian multi fluid model. Additionally, th e RANS standard k mixture model and a
takes place in a series of agitated leach reactors or pachucas. Before leaching the pH of the pulp is normally adjusted to a value of around to ensure minimum loss of cyanide as hydrogen cyanide. The leaching of gold can be conveniently represented by the Elsener equation: [1] Although air agitated leach tanks were commonly used in
Determination of flow patterns in industrial gold leaching tank by The process of gold recovery is composed of a sequence of unit operations ranging from ore comminution. crushing and milling through leaching and finally,.
The efficiency of the leaching process greatly depends on the flow structure created by mechanical agitation (in some cases air agitation) in the leaching tanks. Residence time distribution (RTD) measurement was conducted in the CIL section of a gold processing plant in order to determine the flow structure in the first tank using the 131I radioactive tracer.
In train 1 the tanks are interconnected with open launders and gate valves, in train 2 flow between tanks involves a system of pipes and dart valves. The flow through the tanks is such that any tank in the system may be bypassed, while the circuit continues to operate with reduced volume and residence time.
The carboninleach (CIL) process is one the most efficient methods of gold recovery from gold bearing ores. The efficiency of the leaching process greatly depends on the flow structure created by mechanical agitation (in some cases air agitation) in the leaching tanks. Residence time distribution (RTD) measurement was conducted in the
Jul 29, 2013#0183;#32;Next, leaching tests in columns are conducted for the same variables as for heap leaching. These include size of material, solution strength, agglomeration, and time of leach. For vat leaching, additional tests on flow rate, applicability of soaking cycles, and direction of flow are made to determine the optimum set of conditions.
solids content in tank leaching is kept at a high level, around 40 wt.%. Currently, a typical agitator configuration in a cyanide leaching reactor is two downwardpumping hydrofoil impellers, as illustrated in Figure 1. Hydrofoil impellers generate a highly axial flow pattern for a low power draw.
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