Extensive test work of the SLR on site has shown over 99% of the target mineral is Recovery of gold from concentrates CAPACITIES DISSOLVED OXYGEN LEVELS ppm 10 30 10 30 10 30 10 30 DIMENSIONS LENGTH M 2 8 3 9 4 9 5 5 WIDTH M 1 3 1 8 2 3 2 7 HEIGHT m 2 6 3 1 3 6 4 0
Get PriceCyanide lime or caustic and air or oxygen can constitute some of the largest operating costs in a simple gold operation • Monitoring is usually carried out at regular time intervals to control pH cyanide concentration and dissolved oxygen Samples of solution solids and carbon can also be taken to measure leach rates •
Get Price21 21 Diagnostic leaching The entire sample is pulverised and made ready for ASD submission Carbon in leach CIL/B Tare a 10 liter narrow necked glass bottle Firstly add water then the 1600 g sample to a L S ratio of 2 1 m/m Leave on the roller for 15 20 minutes to allow for mixing
Get PriceUnder the required pH value the diafiltration is performed by spraying with sodium cyanide solution to extract gold To improve the gold heap leaching rate is the key to the heap leaching process and to improve the gold leaching rate we need to start from the following 6 ways ore preparation gold stacking PH value control cyanide
Get Pricesignificant and avoidable gold losses Dissolved Oxygen Understood to be a critical reagent in gold leaching on par with cyanide as originally reported by Elsner in 1846 5 10 and usually the rate limiting reagent in gold leaching 3 However to our surprise
Get Priceapproximately 1 500 mg/L dissolved copper The chemistry of leach solution following 24 hours of leaching is presented in Table 2 Conditions for leaching were not ideal therefore gold and silver extractions were lower than observed with laboratory bottle roll tests 1 However the objective of the test was not to evaluate gold
Get Pricemodified thionocarbamate AF 5415} was used for free gold col lection M l BC was used as a frothing agent The rougher tails were transferred to a 10 litre bottle and pulped to 5Q fa by weight For direct cyanidation the pH was adjusted to 10 5 and sodium cyanide was added 0 5 kg/t The slurry was then rolled on a bottle roll unit for 48
Get Priceto 5 85% from a previous bench scale test with an overall recovery of gold of 91 3% and gold Coarse bottle roll versus crush size for oxide ore sample RESULTS OF RECENT TESTWORK dissolved oxygen levels required for cyanide leaching of gold Oxide transition and primary samples
Get PriceDec 2 2021Gold recovery by cyanide was 94% at a P80 feed of 75 µm a pulp density of 40% w/w pH of 10 5 to 11 NaCN concentration of 1 g/L with a retention time of 48 hours at >8ppm dissolved oxygen
Get PriceFeb 3 2022BOTTLE ROLL LEACH TESTWORK RESULTS Gold Basin submitted a total of 126 oxide gold sample interval A 5 000 4 000 or 1 000 gram portion of as received head material was utilized for leach testing The bottle roll test procedure is outlined in the following dissolved oxygen DO NaCN Au Ag and Cu Additional hydrated lime and sodium
Get PriceThe influence of the oxidants such as potassium permanganate hydrogen peroxide sodium chlorate potassium iodide and potassium ferricyanide were initially evaluated in a screening test The highest gold extractions were observed with potassium permanganate where a recovery of 85 1% was achieved at 1 5 kg/t glycine and 3 kg/t permanganate at
Get PriceEffect of pH on Au Recovery in the Presence of 0 25% Stibnite After Hedley & Tabachnick 1968 Extrapolating the above trend back to the ordinate axis we note that 100% recovery is once again achieved at pH 8 9 but with the reservation that gold recovery will reduce somewhat and cyanide consumption increase as the free CN ion is replaced by dissolved HCN at the lower pH
Get PriceThis application exploits the high affinity of gold I for cyanide which induces gold metal to oxidize and dissolve in the presence of air oxygen and water producing the salt sodium gold cyanide or gold sodium cyanide and sodium hydroxide Cyanide analysis must be performed on suspected feeds and plants or cattle s rumen content for the
Get PriceIt was proposed that for free milling low cyanide consuming ores results of a bottle roll test applied using commonly accepted parameters would approach field scale Au recovery Yet these standardized testing conditions/procedures may not be appropriate for difficult to process high cyanide high oxygen consuming ores [1]
Get PriceCyanide lime or caustic and air or oxygen can constitute some of the largest operating costs in a simple gold operation Monitoring is usually carried out at regular time intervals to control pH cyanide concentration and dissolved oxygen level Samples of solution solids and carbon will also be taken periodically to measure leach rates
Get PriceA double refractory gold ore contains gold particles locked in sulphides solid solution in arsenopyrite and preg robbing material such as carbonaceous matter and so on The diagnostic leach test DLT and preg robbing PR approaches are widely used to investigate the occurrence and the distribution of refractory gold DLT serves to qualitatively evaluate the gold occurrences within the ore
Get PriceThe use of elevated dissolved oxygen leads to a higher degree of the formation of the gold cyanide complex as described by the equation 4Au 8CN O 2 2H 2O → 4Au CN 2 2 4 CIL The CIL tests were conducted on the gravity tails from test B on all three composite samples
Get PriceThe assay data in Figure 6 AuFA is gold by fire assay AuCN is cyanide soluble gold determined by a cyanide shake test and AuWL is a new test for determining the amount of gold dissolved and leached or rinsed with water or water leach WL and all units are troy ounces per dry short ton Thus the dry zone in shows the location of unFigure 5
Get PriceA 140 day heap leach column test was completed on approximately 100 kg of transitional master composite material using a one half inch crush size a sodium cyanide NaCN or reagent
Get PriceBottle Roll Test Effect of Particle Size Cyanide Concentration and Dissolved Oxygen on Gold Extended Leaching Gold Project Daerah Istimewa Yogyakarta Indonesia Putri Leony Process Manager at GreenGold Technology Jakarta Iqbal Maulana Yusuf Student at Institut Teknologi Bandung
Get PriceDescription Sepor is the industry leader in small and medium scale from a few liters per hour to 25 cubic meters per hour or larger Merrill Crowe process plants The standard configuration of the skid mounted Merrill Crowe Plant uses canister pre coat type filters for clarifying and precipitation filters Plate and frame filters are
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Get PriceLeach tail Bottle Roll1 Spot Free CN At dose point s and tails Spot at dose point s Each tank spot test pH First tank Spot in first tank Spot test each tank DO At dose point s Spot at dose point s Spot test each tank WAD CN At tailings Spot test Pulp Density At cyclone overflow or Hourly spot test Gold Accounting2 Spot each tank Carbon
Get PriceCyanide Bottle Roll Leach The bottle roll cyanidation tests were carried out for 48hours on 1 2 kg of P80 75 μm ground samples at 40wt % solids in leach liquor containing 1 0 g/LNaCN Before adding sodium cyanide NaCN the alkalinity was adjusted with hydrated lime to pH 10 5 11 0 and maintained at this level
Get PriceAll the experimental were performed under controlled dissolved oxygen DO leach mode DO control was utilised to ensure sufficient oxygen is present during the cyanidation and glycine cyanide leaching systems Leaching experiments were conducted for 48 hours at 35 C temperature in 1 25
Get Pricespeed of the react is affected by oxygen Oxygen requirements differ in different types of ores but the optimal amount of dissolved oxygen is about 6 8 ppm to find out the optimal value of oxygen in the type of PT ore Cibaliung Sumberdaya conducted research on the addition of H2O2 to dissolved oxygen levels using the bottle roll test method
Get PriceThe test was conducted as a standard 48 hour bottle roll at 40% solids with a cyanide concentration maintained at 1 0 g/L NaCN while the pH was maintained between 10 5 and 11 0 Dissolved oxygen
Get PriceInstead ashing is the processed used the carbon will be ashed which will take about 12 hours or more 7 the ash will then be mixed with borax and will be smelted using a torch compressed air LPG set up 8 the metals will all combine in a button and will be refined further for the pure gold
Get PriceCyanide Gold Extraction Process 911metallurgist com Here is a method on how to conduct a cyanidation bottle roll test AKA Cyanide Gold Extraction Process Riffle out 400 grams of the ore Grind to pass 200 microns 13 15 minutes for hard rock ores; 10 minutes for oxidized ore grind at 35% solids Wet screen Retain and dry fractions
Get PriceCyanide leaching has been the industry standard for gold processing for more than 100 years During the cyanide leach process a cyanide solution or lixiviant is percolated through ore contained in vats columns or heaps Gold is dissolved by the cyanide and then removed from the heap or columns It is then extracted from the pregnant leach solution by adsorption on carbon or resins
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