0086-21-58386256
Modelling of an autoclave used for high pressure sulphuric acid/oxygen leaching of first ... the application of models to predict the steady state and dynamic behaviour of the pressure leaching stages at a Base Metal ... generated from Alcoa of Australia's Western Australia alumina refineries, have the potential to be re-used in a range of ...
literature, the secondary autoclave leaching of decopperized copper anode slimes focusing on base metal and impurity removal has not been significantly investigated previously. In this paper, the secondary leaching step for decopperized anode slimes (i.e. the leach residue of pressure leaching) was studied. The main drawback in the use of
Autoclaves are a preferred component of the process for many large-scale sulfidic refractory bodies, including such processes as Au-Ag pressure oxidation; Cu-Ag-Au pressure oxidation; Ni-Co pressure leach; Ni-Co-Cu concentrate pressure oxidative leach; and TiO 2 HCL pressure leach. To select the right, best process, mining companies need to ...
The slurry and acid then react as they flow through several compartments within the autoclave. The slurry takes approximately 60 minutes to complete the leaching process in the autoclave. Upon leaving the high pressure and temperature atmosphere of the autoclave the slurry must be returned to atmospheric conditions.
Pressure Leaching – Core Group. Core has extensive experience in testwork relating to pressure oxidation and pressure leaching processes. Core has a range of autoclaves on site, including Parr's largest laboratory autoclave, an 18.75 L unit, with full digital control Test programmes carried out at Core include pressure acid leaching of ...
01-03-2014· The slime contained Cu, Te, Se in addition to Ag and Au. To this aim pressure leaching with sulfuric acid in an autoclave removed Cu. selenium and tellurium were extracted by Na 2 SO 3 or Na 2 S solutions and the remained selenium was removed by roasting.
Simultaneous pressure oxidation and leaching experiments were conducted at a temperature range of 40–80 °C, oxygen pressure of 87.5–200 psi, and cyanide concentration of 0.8–1.2 wt% in a 2 ...
material. Leaching is performed in an autoclave operating at a pressure of 600 kPaG and a temperature of 140°C to 150°C. Concentrated H2SO4 is added to the feed to produce a solution with a free acid content between 10 and 30 g/L and a pH of less than 2. Oxygen is passed into the 1st and 2nd compartments of the autoclave.
pressure leaching autoclave au and ag. Big Guns in Copper Conc Leaching Race altametcomau atmospheric pressure and low pressure autoclave leaching after grinding to 105 microns NSC Process This process is based on moderate pressure oxidation at 125155C catalysed with nitrogen species supplied from sodium nitrite preceded by an ultrafine ...
Aimed at the problems of long time of leaching, big consuming of chemical reagent and low recovery rate of Au and Ag in the process of abstracting Au and Ag by normal cyanide leaching method, based on the unchanged former mineral separation process, the high pressure leaching equipment made by authors in the process of cyanide reaching is adopted to make experiment for the pressure cyanide ...
reactions in the leaching circuit with a view to obtaining kinetic data for the system under the current operating conditions. Within the five-compartment autoclave operating at temperatures of 105°C to 110°C and 1100 kPa pressure, the extraction of Ni, Cu, and Co ions into solution is achieved through the oxidation of the sulphide
Extractions of 88 - 95% Au and 83 - 98% Ag were attained ... during the ammoniacal oxidation pressure leaching of copper-nickel-cobalt sulphide concentrates. ... autoclave, heated to a predetermined temperature and the desired oxygen over- pressure was applied and maintained.
v116n12a9 Extraction of copper and gold from, contained Cu, Te, and Se in addition to Ag and Au Pressure leaching with sulphuric acid in an autoclave was used to remove Cu Selenium and tellurium were extracted by Na, leached first with concentrated sulphuric acid in an autoclave at 350°C under 800 kPa oxygen pressure, and then with 01 M sulphuric acid followed by 3 M ammonia .
level. After each leaching experiment, the pressure was decreased, autoclave cooled down and the leach residue filtered, washed and dried. Table 2. Test conditions for pressurized WPCB leaching (tests 1–10), pressurized anode slime leaching (tests 11, 12), atmospheric WPCB leaching (tests 13–16) and pressurized PS leaching (tests 17–20)
(Ag, Au, Pd, Pt, Zn, Cu, Ni, Pb) Chlorine ZnCl2 Lead (99.5% Pb) Comminution ... I Pressure leaching, 105°C, 10 atm II Pressure ... 105°C, 10 atm Precipitation Reduction in autoclave: 170°C, 30 atm Filtration Filtration Filtration Boiling Filtration Filtration Oxy hydrolysis Air APPENDIXES 563. A.4a Flow Sheet for Extraction of Zinc from ...
autoclave pressure oxidation gold au. A carbonaceous refractory sulphide ore is processed in an autoclave pressure oxidation plant and subsequently subjected to a cyanide leaching an initial mineralogical study of the feed ore by quantitative dynamic sims analysis has shown that of the gold is contained as submicroscopic gold in pyrite with the remainder contained in primary
Pressure Leaching – Core Group. Core has extensive experience in testwork relating to pressure oxidation and pressure leaching processes. Core has a range of autoclaves on site, including Parr's largest laboratory autoclave, an L unit, with full digital control Test programmes carried out at Core include pressure acid leaching of Nickel and Scandium bearing ores, pressure oxidation of ...
minerals and leaching the Au/Ag with the cyanide ions, simultaneously in a single stage. ... autoclave. Finally the pressure oxidation cyanid ation process is flexible and can accommodate .
concentrates. The process consisted of biological leaching to partially oxidise sulphides, followed by pressure leaching for complete sulphide oxidation and arsenic precipitation, followed by liquor neutralisation and cyanidation of the autoclave residue for gold recovery. This paper provides a brief description of the treatment
autoclaves utilizing the "pressure-acid leach" process (PAL). ... temperatures (255o-270o C) and pressures (4,000 kPa – 5,300 kPa). Many examples of this type of plant exist in Australia and New Caledonia and the most recent plant, Ambatovy, ... pressure leaching of …
Pb/Ag Residue Iron Residue Cd Impurity Products and Residues Refined Zinc Product Zinc ... Pb, Ag, Au, Ga, Ge, In) –Flexible Plant Size (not tied to roaster unit production rate) –Commercially Proven 9 . Direct Leaching of Zinc Concentrates • Zinc Pressure Leaching –Developed by Sherritt and Cominco (now Teck) and installed in 1981 in ...
material. Leaching is performed in an autoclave operating at a pressure of 600 kPaG and a temperature of 140°C to 150°C. Concentrated H2SO4 is added to the feed to produce a solution with a free acid content between 10 and 30 g/L and a pH of less than 2. Oxygen is passed into the 1st and 2nd compartments of the autoclave.
Investigation of high-temperature autoclave leaching 675 3 Results and discussion Leaching results are presented in Table 3. Table 3. The results of autoclave leaching of «Maykain B» flotation concentrate № test Solid/ Ag, liquid SO Leach solution, g/dm3 T, 0С t, hours The composition of the productive solution, g/dm3 Cu Zn Fe As Pb Au, mg ...
01-01-2021· Conversely, high concentrations of sulfuric acid and large liquid-to-solid ratios are selected to completely extract Te during second-stage leaching. Cu, Se, and Te are adequately removed by two-stage oxidation pressure leaching. Au and Ag are enriched in the leaching residue, which can be recovered by conventional technological routes.
leaching NaCN or KCN salts for Au and Ag leaching Thio Bacillus Ferrooxidans for Fe(SO 4) 3 leaching . Leaching methods ... Pressure leaching – Hard to dissolve concentrates in autoclaves . Recovery methods
Pressure leaching of the first stage leach residue in Base Metal Refinery (BMR) circuits aims to achieve high base metal dissolution with minimal precious metal leaching. Optimum autoclave operation is challenging because of the complex leaching chemistry, varying mineralogy of the feed material, and interaction between the different process variables.