residence time in leaching tanks

2020-07-20T10:07:10+00:00

residence time in leaching tanks

  • Leach circuit residence time testing Hydrometallurgy

      Leach circuit residence time testing Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction Metallurgist Mineral Processing Engineer I am wondering if anyone has done any residence time testing on any leach circuits or tanks

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  • Residence Time Distributions in a Stirred Tank:

      of the residence time are accurately predicted by CFD in the transition flow regime Introduction Continuous stirred tanks are used ubiquitously in the chemical process industry for mixing, reactions, and crystallizations The mixing in a continuous stirred tank is often not ideal The residence time distribution (RTD)

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  • Residence Time/retention Time In A Vessel Student

      Residence time equals the volume of the reactor divided by the volumetric flow rate Meters cubed divided by meters cubed per second yields second In other words the yield is the residence time of the product Before estimating the product you should be aware of of the volume, flow rate, temperature, pressure and all the data you were given

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  • Determination of Flow Structure in a Gold Leaching

    Experimental residence time distribution (RTD) measurement and computational fluid dynamics (CFD) simulation are the best methods to study the hydrodynamics of process flow systems However, CFD approach leads to better understanding of the flow structure and extent of mixing in stirred tanks In the present study, CFD models were used to simulate

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  • Radiotracer investigation in gold leaching tanks

      From the cumulative MRT measured at the exit of the sixth tank, the average residence time per tank was estimated and was found to be about 204 min The estimated average residence time is in good agreement with the experimentally measured MRTs measured in tank 1 and tank 2

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  • An improved model of continuous leaching systems using

      residence time distribution) on the reactor performance can be predicted Therefore, the model can be used for dynamic and static analyses of leaching circuits as well as designing and optimizing the processing plants Keywords : Continuous leaching, Dissolution modeling, Particle size, Residence time 1 Introduction

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  • Determination of Flow Structure in a Gold Leaching Tank

      Experimental residence time distribution (RTD) measurement and computational fluid dynamics (CFD) simulation are the best methods to study the hydrodynamics of process flow sys Howtems ever, CFD approach leads to better understanding of the flow structure and extent of mixing in stirred tanks

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  • The process design of gold leaching and carboninpulp

      to lower operating costs Typical residence times in the leach section may range from 20–40 hours depending on the headgrade and nature of the ore and the number of leach reactors in series may range from 6 to 12 After leaching, the pulp is passed over a feed screen to ensure removal of tramp material such as woodchips,

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  • Improving the process performance of gold cyanide

      suspension induced by the agitator, which can decrease the effective reactor volume and thus the residence time of coarse solid particles Conventional gold cyanide leaching reactor Due to the inherently low concentration of gold in ore and the relatively long retention time required for gold to

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  • Leaching Plant Design Mineral Processing

      With normal plant life expectancy 4″ nominal wood staves are recommended In cases where heat retention is important, either wood tanks or insulated steel tanks are recommended Where wood tanks are not applicable, steel tanks, lined with rubber,

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  • Residence time distribution of an industrial

    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

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  • Residence time distribution of an industrial

    The flow behavior of the liquid phase of an industrial gold leaching tank is studied using lithium chloride tracer The residence time distribution is interpreted using an arrangement of simple ideal reactors, the parameters of which are calibrated by a standard least squares method The measured net volume of the reactor is 62% of its nominal volume, due to the space occupied by the agitation

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  • Determination of flow patterns Zdzisław Stęgowski, 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 The shape of the experimental data revealed that the flow behaviour in the tank was close to an

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  • what are the effects of leaching time on gold recovery

      Residence time in the CIL circuit is the time taken for the slurry to flow through the tanks, and is an important operational consideration The longer the gold particles are in contact with the cyanide in the slurry the more gold that will be leached

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  • Residence Time/retention Time In A Vessel Student

      Residence time equals the volume of the reactor divided by the volumetric flow rate Meters cubed divided by meters cubed per second yields second In other words the yield is the residence time of the product Before estimating the product you should be aware of of the volume, flow rate, temperature, pressure and all the data you were given

  • More
  • Determination of Flow Structure in a Gold Leaching

    Experimental residence time distribution (RTD) measurement and computational fluid dynamics (CFD) simulation are the best methods to study the hydrodynamics of process flow systems However, CFD approach leads to better understanding of the flow structure and extent of mixing in stirred tanks In the present study, CFD models were used to simulate the flow in an industrial gold leaching tank

  • More
  • Determination of flow patterns in industrial gold

    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

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  • ALTA MetBytes Bioleaching Moves into Nickel

      The bioleach circuit consists of eight tanks, with an overall residence time of seven days at the design throughput Four of the tanks are configured as primary oxidation reactors, followed Leaching of A Primary NickelCobalt Sulphide Ore, ALTA 2002 Conference, May 2002, Perth, Australia

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  • Determination of mixing characteristics in leaching

    Made available by US Department of Energy Office of Scientific and Technical Information

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  • Improving the process performance of gold cyanide

      Improving the process performance of gold cyanide leaching reactors 3 literature (Equation [1]) shows that k L a is a function of mixing power intensity (P/V) and superficial gas velocity v s The coefficients A, B, and C are reactor and applicationspecific

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  • what are the effects of leaching time on gold recovery

      Residence time in the CIL circuit is the time taken for the slurry to flow through the tanks, and is an important operational consideration The longer the gold particles are in contact with the cyanide in the slurry the more gold that will be leached

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  • The Direct Nickel Process :: Total Materia Article

    The residence time in the leaching tanks is between 26 hours with 4 hours being typical During the leaching around half of the mass of the ore is dissolved into the nitric acid, leaving behind the acid insoluble minerals, usually consisting of silicates, and the pregnant leach solution (PLS)

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  • An improved model of continuous leaching systems using

      residence time distribution) on the reactor performance can be predicted Therefore, the model can be used for dynamic and static analyses of leaching circuits as well as designing and optimizing the processing plants Keywords : Continuous leaching, Dissolution modeling, Particle size, Residence time 1 Introduction

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  • pH/ORP measurement Cyanide leaching process

      the leach tanks to help accelerate the leaching process Since oxygen is a key component in the above reaction, it increases gold recovery for a given residence time in the leach tanks Usually, leach tanks are large and contain only cyanide solution and pulp This slurry then flows into several carbon

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  • ALTA MetBytes Bioleaching Moves into Nickel

      The bioleach circuit consists of eight tanks, with an overall residence time of seven days at the design throughput Four of the tanks are configured as primary oxidation reactors, followed Leaching of A Primary NickelCobalt Sulphide Ore, ALTA 2002 Conference, May 2002, Perth, Australia

  • More
  • Modeling the Residence Time Distribution of

    The start‐up time (4 h 20 min), the mean residence time (2h 40 min), and the disturbance width (4 h 30 min) are prolonged The disturbance has a lower amplitude due to the broadening Process with pre‐filled CSTR (Figure 4, Supporting Information) has a longer start‐up phase (4 h 25 min) but the same residence time and the disturbance

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  • BenchScale Testing of the Continuous Sludge Leaching

    a short residence time on the order of 8 hours Unfortunately, the time required to drive the boehmite leaching reaction is much higher than the gibbsite reaction As it stands, the current WTP leaching process does not efficiently remove aluminum in the form of boehmite

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  • Gold Mining Process Development – Denver Mineral

    through a series of agitated mixing tanks with a residence time of 24 hours The gold bearing liquid is then separated from the leached solids in thickener tanks or vacuum filters, and the tailings are washed to remove gold and cyanide prior to disposal The separation and washing take place in a series of units

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  • Leaching and adsorption circuits – for better metal

    The sizing of the tanks is calculated based on the time required to completely leach the ore, usually 2472 hours The tanks are configured in stages and can be configured in cascade orientation making use of gravity slurry flow or in an active carousel configuration where the

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  • MODELING OF THE CARBONINPULP (CIP) PROCESS IN

    Gold is predominantly produced from its ores by hydrometallurgical cyanide leaching process The cyanide leaching process is applied by grinding the ore below 75 micrometers and dissolving the gold as Au(CN) 2by mixing the ground ore with a dilute cyanide solution to obtain slurry above pH 10 and by supplying oxygen to leach tanks

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  • leaching tank chinaminingproject

    Leaching Agitation Tank, which is widely use in Cyanidation processes may include the following operations: through a series of agitated mixing tanks with a residence time of 24 hours The gold bearing liquid is then separated from the leached solids in thickener tanks or vacuum filters, and the tailings are washed to remove gold and

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  • pH/ORP measurement Cyanide leaching process

      the leach tanks to help accelerate the leaching process Since oxygen is a key component in the above reaction, it increases gold recovery for a given residence time in the leach tanks Usually, leach tanks are large and contain only cyanide solution and pulp This slurry then flows into several carbon

  • More
  • ALTA MetBytes Bioleaching Moves into Nickel

      The bioleach circuit consists of eight tanks, with an overall residence time of seven days at the design throughput Four of the tanks are configured as primary oxidation reactors, followed Leaching of A Primary NickelCobalt Sulphide Ore, ALTA 2002 Conference, May 2002, Perth, Australia

  • More
  • Modeling the Residence Time Distribution of Integrated

      The start‐up time (4 h 20 min), the mean residence time (2h 40 min), and the disturbance width (4 h 30 min) are prolonged The disturbance has a lower amplitude due to the broadening Process with pre‐filled CSTR (Figure 4, Supporting Information) has a longer start‐up phase (4 h 25 min) but the same residence time and the disturbance

  • More
  • Optimization of cyanidation parameters to increase the

      Residence Time 28 hours (based on 75tph feed capacity) Gold Recovery 89% In order to determine the maximum recovery of gold leaching by Taguchi method, the sodium cyanide, pH, solid percent, d 80 and residence time parameters were chosen at two levels The dissolved oxygen concentration in the pulp was

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  • APPLICATION OF LEACHING KINETICS MODELLING TO A

      leaching tanks and eight adsorption tanks At five different times, the residual solid from each tank were taken and analysed for gold while the ore feed rate and solid concentration values, occured at the time of sampling, were noted For a feed rate (Mg per hour), solid concentration (%) and tank volumes (m3), residence time (h) and flow

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  • v099n01p013 The process design of gold leaching and

    Conventional practice is to have a mean pulp residence time of about an hour in each tank The tanks are normally mechanically agitated and each will contain a batch of carbon of concentration 10–25 grams of carbon per litre of pulp (05 to 12% by volume carbon)

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  • Leaching and adsorption circuits – for better metal extraction

    The sizing of the tanks is calculated based on the time required to completely leach the ore, usually 2472 hours The tanks are configured in stages and can be configured in cascade orientation making use of gravity slurry flow or in an active carousel configuration where the

  • More
  • Tank leaching BioMineWiki Skellefteå

      In oxidative leaching processes where air or oxygen is blown into the reactors the stirrer might be a turbine that has a better oxygen mass transfer capacity than a propeller but at the cost of a higher energy consumption In some cases also airlift reactors (Pachuca tanks) are used Tank leaching processes require fine ground ores/concentrates and are more costly to operate than insitu

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  • MODELING OF THE CARBONINPULP (CIP) PROCESS IN

    Gold is predominantly produced from its ores by hydrometallurgical cyanide leaching process The cyanide leaching process is applied by grinding the ore below 75 micrometers and dissolving the gold as Au(CN) 2by mixing the ground ore with a dilute cyanide solution to obtain slurry above pH 10 and by supplying oxygen to leach tanks

  • More