zadra elution lumn

2020-08-26T04:08:30+00:00
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  • Zadra elution circuit Pyrometallurgy: Roasting,

      Not process water E/W single pass efficiency is critical for Zadra because gold not recovered is then recirculated back to the elution column, slowing down the elution rate Eluant flowrate is not too critical in the 24 BV/h range You should be achieving optimum elution with about 30 BV of eluant through the column (15h at 2BV/h)The elution unit is configured like a packed bed distillation tower with a heater on the base of the column, an overhead condenser, a reflux pump and the loaded carbon functioning as the tower packing Loaded carbon is first presoaked with sodium cyanide/sodium hydroxide solution TheCarbon Stripping – Denver Mineral Engineers  Elution stage During this stage the gold and silver desorbed off the carbon during the ‘preheat * is washed out of the column into the eluate tank This stage takes 2 1/2 hours and involves the use of 5 bed volumes of potable water (216 cubic metres) AARL Carbon Stripping System Operation: Elution   The gold elution column is a closed reactor in the Zadra process Because the eluant is pumped into the column at a slow Hou rate of t\$o bed volumes per hour there is no dispersion or radial cariation in the eluant concentration, either upstream (closed) or downstream (closed) of the reaction section of the columnA reactor model for gold elution from activated The ZADRA elution circuit at Gold Fields Ghana Limited was designed as a pressure system with an operational pressure set point of 350 kPa It consists of circulating 3% (PDF) ZADRA Elution Circuit Optimisation and

  • The eluate solution used in the Zadra elution process

    the elution column and the electrowinning cells in series The eluate solution used in the Zadra elution process is typically 02 05% NaCN and 1 2% NaOH All operating variables that apply to the AARL elution system apply to the Zadra system  A laboratoryscale elution rig was commissioned to simulate Zadra and AARL carbon elution conditions, see Figure 1 The majority of the system was constructed from stainless steel tubing and Swagelok fittings The elution column was ~600 mm long with an internal diameter of 25 mm, and a capacity of ~100 g of granulated activated carbon per experimentElution behaviour of metals from carbon  A Thermo Scientific Elution Buffers We offer two, readytouse elution buffers for use in protein affinity purification systems: • IgG Elution Buffer (Product No 21004 and 21009) is a stabilized, pH 28, aminecontaining buffer that is efficient and suitable for most immunoaffinity purification systemsOptimize elution conditions for immunoaffinity purification  The key role in elution is played by temperature, in a Zadra system not much happens below 90C Pressure Zadra is run around 110C but can vary depending on the subtleties of the system Pressure Zadra is much faster than unpressurised Zadra, depending on the operating conditions around 12 hours versus 48 hoursZadra and DIY elution system Gold Refining   There are two main types of elution processes and these are the Zadra and the AARL elution variant The Zadra elution process makes use of pumping a hot (90) caustic cyanide solution with the loaded carbon in the elution column at atmospheric pressure The eluate obtained is then treated in an electrowinning circuit where gold is removed The barren electrolyte is returned to the elution column Modelling of the AARL elution process ScienceDirect

  • Modelling of the AARL elution process ScienceDirect

      The Zadra elution process makes use of pumping a hot (90) caustic cyanide solution with the loaded carbon in the elution column at atmospheric pressure The eluate obtained is then treated in an electrowinning circuit where gold is removed The barren electrolyte is returned to the elution column as eluant This process exhibits slow kinetics the elution column and the electrowinning cells in series The eluate solution used in the Zadra elution process is typically 02 05% NaCN and 1 2% NaOH All operating variables that apply to the AARL elution system apply to the Zadra system The caustic cyanide solution is pumped to the elution column at 2 to 3 bed volumes (BV)/hour, and is pre heated by the solution exiting the columnThe eluate solution used in the Zadra elution process   Tau Lekoa stream uses the Zadra process The eluant is continuously circulated through the column and an electrowinning cell in series A caustic cyanide solution, normally 02 to 05 % NaCN and 2% NaOH, is pumped to the elution column and is preheated by the solution leaving the column The temperature is further raised by a steam heat exchangerOPTIMIZING THE OPERATING CONDITIONS OF GOLD   Tau Lekoa stream uses the Zadra process The eluant is continuously circulated through the column and an electrowinning cell in series A caustic cyanide solution normally 02 to 05 NaCN and 2 NaOH is pumped to the elution column and is preheated by the solution leaving the column The temperature is further raised by a steam heat exchanger morefor manufacturing elution column for processing of   The key role in elution is played by temperature, in a Zadra system not much happens below 90C Pressure Zadra is run around 110C but can vary depending on the subtleties of the system Pressure Zadra is much faster than unpressurised Zadra, depending on the operating conditions around 12 hours versus 48 hoursZadra and DIY elution system Gold Refining

  • China HighRate Gold Loaded Carbon Elution Column

    Highrate Gold Loaded Carbon Elution Column and Electrowinning Cell Plant 11 Elution CN or OH dissolved in desorption solution is easier than Au(CN)2 to be absorbed by the activated carbon which causes Au(CN)2 absorbed on loaded carbon is replace by CN or OH and the reversible balance of of gold adsorption is broken  A Thermo Scientific Elution Buffers We offer two, readytouse elution buffers for use in protein affinity purification systems: • IgG Elution Buffer (Product No 21004 and 21009) is a stabilized, pH 28, aminecontaining buffer that is efficient and suitable for most immunoaffinity purification systemsOptimize elution conditions for immunoaffinity purification  16 Carbon elution/ stripping 18 161 Atmospheric Zadra stripping 20 162 Pressurized Zadra stripping 23 163 Anglo American Research Laboratory (AARL) stripping 25 164 Alcohol stripping 29 165 Micron stripping 35 17 Acid washing carbon 37 18 Acid washing followed by pressure Zadra Investigation of Mercury Reduction in Gold Stripping   Methanol, ethanol, and Isopropanol were all found to increase the gold desorption rate Ethylene or propylene glycol are frequently used, proccess than alcohol, to increase the speed of atmospheric pressure Zadra stripping 7 Being the first commercial continuous elution column built by Bechtel it was very conservatively sizedAARL ELUTION PROCESS PDF Handel Sheet PDFOperational and economic factors tend to favor the application of continuous processes in preference to batch processes in the majority of mineral processing applications In this paper, the requirement for a continuous elution process is established and the development of a largescale pilot plant is described It is based on a continuous elution apparatus that has a number of special featuresAtmospheric continuous elution SpringerLink

  • ACTIVATED CARBON IN GOLD RECOVERY Kemix

      Typical Zadra Elution Circuit Zadra Elution Circuit Loaded Carbon Hopper Acid Wash Column Elution Column Heat Exchanger Loaded Carbon From Adsorption Circuit Eluant Make up and Storage Cathode Sludge Electrowinning Circuit Eluted Carbon To Thermal Regeneration Soft Water Caustic Cyanide Hydrochloric Acid Hydrochloric Acid Heat Recovery   Tau Lekoa stream uses the Zadra process The eluant is continuously circulated through the column and an electrowinning cell in series A caustic cyanide solution normally 02 to 05 NaCN and 2 NaOH is pumped to the elution column and is preheated by the solution leaving the column The temperature is further raised by a steam heat exchanger morefor manufacturing elution column for processing of   In the latest Zadra elution process, hot solution of 1% weight/volume (w/v) sodium hydroxide (NaOH) and 02% w/v NaCN are recycled through a goldloaded activated carbon bed for up to 72 hours at 95100° C to elute gold cyanide The goldloaded carbon is then transferred to the Carbon Elution Column and preheated to operating temperatures Process for eluting precious metals from activated Como Engineers has refined the Zadra elution process and optimised it to run with the highest efficiency through proprietary system designs which optimise system flows, elution temperatures, electrowinning cell and rectifier designs and reagent combinations lowering solution tenors returning back to the elution column and providing the Modular Elution Circuits with Gold Room Como Highrate Gold Loaded Carbon Elution Column and Electrowinning Cell Plant 11 Elution CN or OH dissolved in desorption solution is easier than Au(CN)2 to be absorbed by the activated carbon which causes Au(CN)2 absorbed on loaded carbon is replace by CN or OH and the reversible balance of of gold adsorption is brokenChina HighRate Gold Loaded Carbon Elution Column

  • Investigation of Mercury Reduction in Gold Stripping

      16 Carbon elution/ stripping 18 161 Atmospheric Zadra stripping 20 162 Pressurized Zadra stripping 23 163 Anglo American Research Laboratory (AARL) stripping 25 164 Alcohol stripping 29 165 Micron stripping 35 17 Acid washing carbon 37 18 Acid washing followed by pressure Zadra   Methanol, ethanol, and Isopropanol were all found to increase the gold desorption rate Ethylene or propylene glycol are frequently used, proccess than alcohol, to increase the speed of atmospheric pressure Zadra stripping 7 Being the first commercial continuous elution column built by Bechtel it was very conservatively sizedAARL ELUTION PROCESS PDF Handel Sheet PDF  Each column was mm diameter by 10 metres high which for 24 tonnes per day of carbon per column was equivalent to the pilot plant peocess at 1 tonne per day The elution step may be further divided into two major stages; carbon preheat and elution properAARL ELUTION PROCESS PDFOperational and economic factors tend to favor the application of continuous processes in preference to batch processes in the majority of mineral processing applications In this paper, the requirement for a continuous elution process is established and the development of a largescale pilot plant is described It is based on a continuous elution apparatus that has a number of special featuresAtmospheric continuous elution SpringerLink  The feasibility of a process involving the use of activated carbon in a multistage column (NIMCIX contactor) for the recovery of gold from unclarified pregnant solutions was investigated on pilotplant scale It was found that satisfactory extractions, corresponding to a recovery of 996 percent, can be achieved with an average gold concentration of 00077 ppm in the barren solutions from a Au Recovery Using an Activated Carbon Column