bacterial leaching of copper, zinc, nickel and aluminumjul , · effect of pulp density. the effect of pulp density on metals such as copper, nickel, zinc and aluminum dissolution efficiency was studied in the range 2.5% (w/v). when fig. 7 was investigated, it was clearly seen that there was an inverse relationship between pulp density and metal dissolution efficiency. in other words, the higher thea study of the relative impact of particle sizepulp density of 55%, as opposed to the desired conventional pulp density of 4045 %. this could potentially result in a buildup of silt in the leach tanks as suggested by osei et al. . osei et al. explained that poor grinding due to increased plant throughput and subsequent carryover effect ofeffect of activated carbon on the thiosulfate leaching of gsep 01, · the three samples used in this work were ground in a rod mill using tap water and at a pulp density of 60 wt%. the particle size was targeted at a p 80 of 75 μm. the ground material was then homogenized and split into 0g charges for leach testwork. a 0g charge was further split into 25g charges for head assays. 2.2. assayseffects of increasing leaching density on dissolution rateρ = slurry density in g/cm³ t = quart funnel time in seconds. for a typical g ore of 40% solids w/w and 2.70 sg, the pulp density is 1.34 g/cm3. with a proper marsh funnel, draining in less than 40 seconds is usually indicative of a slurry that is fine for processing. in this case μ = 1.34(4025) = .1 cpestimated reading time 4 minsthe west driefontein reclamation carboninpulp plantthroughput, pulp density, g input, leaching efficiency prior to cip, and the rate of carbon movement. a payback period of about months. a capital expenditure forecast of r8 million was proposed and, after approval, the fullscale plant was designed and built by kemix (pty) ltd.the process design of g leaching and carboninpulpthe pulp density to about 50% solids by mass. this reduces the size of the leaching plant that would be required as well as reduces the amount of leaching reagents required. many g plants use conventional thickening with flocculant addition. high rate thickeners, as well as dewatering systems that use cyclones only or cyclones and highratethiosulphate leaching an alternative toleaching is a sensitive process that requires both dependent and independent optimization of each of the chemical components of the leach reaction, as well as physical parameters such as pulp density and temperature, in order to maximize g recovery and minimize reagent losses. thebioleaching of arsenicrich g concentrates by bacterialbioleaching experiments were conducted in 250 ml flasks containing 100 ml 9 k liquid medium and 10% (v/v) of bacterial flora. the pulp density of arsenicrich g concentrates was 5% (w/v), and the initial ph of the culture was adjusted to 2.0 with 5 mol/l h 2 so 4. flasks were incubated at 40°c and 0 rpm in a rotary shaker. effect of pulp density and particle size on thethe g concentrate was used at 2.5%, 5%, 10%, and % w/v pulp density and at four size fractions 0106, 10675, 7538 and 38μm. temperature was 68°c and the initial ph was 2.0.g and silver leaching by cyanidationapr , · also there is apt to be more settling of sand fractions which may cause mechanical difficulties when treating a dilute pulp. accordingly agitator densities are usually kept from 30% to 60% solids, grinding capacity in a ball mill is also if the density drops below 70% solids. what is the effect of aeration on g and silver leachingg cyanide leaching process xinhaiapr , · taking a lowgrade oxidized g ore containing carbon and arsenic as an example, the leaching test was carried out when the grinding fineness 0.074mm accounted for 95%, the pulp density was 33% and ph value was , the g leaching rate kept 81.48% when the leaching time was 24 hours, 36 hours and 48 hours respectively.the leaching and adsorption behaviour of g ores4.4 the effect of copper cyanide on g leaching from oxide and sulphide ores 0 4.5 summary 1 chapters pregrobbing phenomena in the cyanidation of g ores 1 5.1 objectives of this chapter 1 5.2 background information 1 5.3 pregrobbing behaviour by the ores at low cyanideleaching of g from the waste mobile phone printedjan 02, · a leaching of 56.7% g was obtained under the optimum condition of 0.1m ammonium thiosulfate, 40 mm copper sulfate, ph 1010.5, pulp density 10 g/l at room temperature and stirring speed of 250 rpm in 8h duration. the maximum leaching of g in the ph range 1010.5 may be attributed to the higher stability of the ammonium thiosulfate.
leaching adsorption resource booktherefore to leach the g out of the ore and into solution, cyanide, and oxygen must be added to the slurry. lime is added to the grinding circuit to modify the ph of the slurry to effect of changes in pulp density and tonnage rate on residence time 0 tph @recovery of g, silver and platinum group metals withby leaching at a very low pulp density with moderate agitation, the pulp solids may be naturally maintained in a condition of separation where by the freundlich adsorption equation (c 3 =kc a n where c 3 is the concentration of g per unit area of the solids, c a is the concentration of g per unit volume of the pulp liquor, k and n beingtechnical report treatment of cyanide heap leaches and2.2 tank operations (carboninpulp and carboninleach) in carboninpulp and carboninleach cyanidation methods, primary leaching takes place in a series of tanks. finely ground g ore is slurried with the leaching solution. the resulting gcyanide complex is then adsorbed on activated carbon.activated carbon in g recovery kemixin the g recovery industry, activated carbon from a number of precursors has been used. due to the nature of the inpulp process, the following characteristics are important high affinity towards g kinetic activity and equilibrium loading. hard, resistant to abrasion. density, suited to mixing in pulp.g cil cip g leaching process explained ccdjan 02, · it is then thickened to a requisite 4050 percent solids prior to leaching. this range of pulp density keeps the activated carbon suspended in the pulp and is suitable for the subsequent leaching operation. following leaching, the pulp flows into the carboninpulp circuit which operates in countercurrent fashion.estimated reading time 9 minswo900107a1 recovery of g, silver and platinumin the recovery of noble metals, including g, silver and members of the platinum group, the ores or tailings are subjected to the action of various leaching agents, namely, sodium cyanide, thiourea, chlorine and aqua regia and optionally a leaching aid, such as chloride ions. the resulting slurry is then diluted to an optimum pulp density of 0.1 to 10.0% and allowed to stand in a hing effect of pulp density and particle size on thethe g concentrate was used at 2.5%, 5%, 10%, and % w/v pulp density and at four size fractions 0106, 10675, 7538 and 38μm. temperature was 68°c and the initial ph was 2.0.pulp density slidesharemay , · leaching experiments batch experiments were carried out in the electrobioreactor at % (w/v) pulp density, an initial ph of around 1.5, a temperature of 50 °c, a stirring rate of 600 rpm, an aeration rate of 1 vvm (volume of air/volume of slurry/min) and norris nutrient medium with 0.02% (w/w) yeast extract addition.impact of pulp density on extraction of metals, byat the concentration of 1 4 gm pulp density iron extraction was obtained in the range of 8.43±1.78 to 286.45±1.82 mg and percentagewise it was 60.49% to 87.33%. similarly, the pulp density of gm showed the extraction of aluminum in the range of 284.66±0.981 to 589.67±0.827 mg and percentagewise it was 39.10% to 80.99%.optimum leach density hydrometallurgy leaching in heapi found 55% solids is best. if below 50% you will start sinking carbon. when density is too heavy say above 60% carbon and dissolved g (pregnant solution) will have less contact so retention time is a factor but always found with circuits i have run cil or cip 55% got the best results. it could be ore and viscosity dependent. see below
cyanide leaching g recovery process carbon in pulpjul 09, · cyanide leaching g recovery process carbon in pulp can be used in areas where fine gbearing rocks are found. sodium cyanide solution is mixed with f...author jason miningoptimization of pulp density and particle size in thethe objective of this work was to determine pulp density and particle size values that maximize the volumetric solubilization rate of iron from a pyritic g concentrate. the leaching was carried on in agitated flasks with the thermophilic archaeon sulfolobus metallicus. the concentrate contained 66.7% pyrite, and the constant operationdqgsduwlfohvl]hrqlqgluhfwelrohdfklqjrithe pulp density. the maximum recovery for varying pulp density were at 5% solid/liquid ratio and the recovery were ni at 1.63%, al at 0.47%, fe at 0.23% and mg at 1.09%. the effect of particle size on leaching process showed that the leaching process follows the shrinking core model.pulp density an overview sciencedirect topicsin the leaching of any metal from an insoluble ore two interrelated physical parameters can be critical, regardless of the extraction methods involved. these are pulp density and specific surface area of the mineral substrate to be leached. pulp density describes the mass of mineral in unit volume of liquid available, usually expressed as a % (w/v).cyanide amenability studies of g oresthe use of designthe carboninleach (cil) test was done to confirm the results obtained from the bottle roll test after modelling with doe. the cil test was carried out for 24 h at a ph of 10.5, pulp density of 45% solid, cyanide concentration of 230 ppm, particle sizes of 106 and 75 µm and fresh activated carbon addition of g for all the three pit samples. g dissolution from ore with iodideoxidisingpulp density used in this experiment was 3.3 w/v%. incubated in a liquid medium containing ground ore with 0.26 wt.% au and 3.3 w/v% pulp density, and their abilities to leach g from ore were evaluated. decrease in residual g content from the orecorrelation between pulp density in to g and silvercorrect me if i am wrong, initially carbon density is lower than pulp because its pores are not fully loaded with g and silver yet, then by the time during the cil process, the au and ag cyanide will fill the carbon pores hence the carbon density will be increased and theimpact of pulp density on extraction of metals, byat the concentration of 1 4 gm pulp density iron extraction was obtained in the range of 8.43±1.78 to 286.45±1.82 mg and percentagewise it was 60.49% to 87.33%. similarly, the pulp density of gm showed the extraction of aluminum in the range of 284.66±0.981 to 589.67±0.827 mg and percentagewise it was 39.10% to 80.99%. g dissolution from ore with iodideoxidisingpulp density used in this experiment was 3.3 w/v%. incubated in a liquid medium containing ground ore with 0.26 wt.% au and 3.3 w/v% pulp density, and their abilities to leach g from ore were evaluated. decrease in residual g content from the oreestimating process design g extraction, leach residencemay 01, · pulp density can be a major factor affecting the results for plant design purposes and should be treated as a test work variable. as with high claybearing ore, where pulp viscosity can hinder mass transfer, minimizing the influence of test equipment on g extraction kinetics may require low pulpg biorecovery from ewaste an improved strategyoct 01, · it is also evident that the control (i.e. growth medium) showed significant copper leaching (40% after 8 days, at 0.5% pulp density) but not g, a phenomenon that confirmed that the biogenic cyanide was the only leaching agent for g.what are the factors affecting g leaching?feb , · pulp solidliquid ratio both pulp density, pulp density will directly affect the leaching rate of g leaching speed and slurry concentration is too high, the pulp is hard to flow, the g leaching speed and low leaching rate, pulp density low, while improving the leaching rate and leaching rate of g, but so requirements for equipment volume increases, the rise in the cost of equipment investment, will also increase, leaching