Abstract In this research the effect of different citric acid concentrations ammonia concentration temperature leaching time stirring speed and liquid to solid ratio on the zinc leaching from low grade zinc oxide ore in a NH 3 H 3 C 6 H 5 O 7 H 2 O system were studied The results showed that the zinc leaching rate is only 4 7% when the citric acid concentration is 0 M and the leaching
Get PriceThe leaching kinetics of Nigerian complex covellite ore was investigated in ammonia ammonium sulfate solution The concentration of ammonia and ammonium sulfate the ore particle size and the temperature were chosen as parameters in the experiments The results show that temperature concentration of ammonia ammonium sulfate has favorable
Get PriceA hydrometallurgical method is provided for recovering copper from particulate copper sulfide flotation concentrate containing at least about 20% copper by weight as cuprous and cupric sulfide a significant portion of the copper in the copper sulfide concentrate being in the cuprous state The flotation concentrate in the finely divided state is subjected to leaching with an alkaline solution
Get PriceThe portal can access those files and use them to remember the user s data such as their chosen settings screen view interface language etc or their login data By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes
Get PriceThe leaching of copper from the tailings of baifang copper mine in hunan province in china by aqueous ammoniaammonium chloride solutions has been studied the tailings belong toowgrade and highalkaline copper ore the effect of leaching time the concentration of ammonia solidliquid ratio and temperature were investigated View More
Get Price2 The speiss in Example 1 was leached with ammonia/ammonium carbonate solution with an exothermic reaction at approximately 55° C under an oxygen partial pressure of 20 psi for 1 hour Cu and As were extracted at 99 3% and 90% efficiency However a considerable amount of Pb was solubilized ranging from 3 8 to 6 gpl in the leach solution
Get Priceمرکزی صفحہ Hydrometallurgy Study on the dissolution process of zinc anode in ammoniacal ammonium chloride system Hydrometallurgy 2024 Vol 89; Iss 3 4 Study on the dissolution process of zinc anode in ammoniacal ammonium chloride system Zheng Huajun Gu Zhenghai Zhong Jinhuan
Get PriceTested leaching agents include sulfuric acid ammonia ammonium carbonate and ammonia ammonium sulfate solns with or without addn of hydrogen peroxide The results show that ammonia leaching has high selectivity for copper and it could serve as a first step to recover the copper content in the e waste which is one of the major valuable metals
Get PriceThe Taguchi method was used as the experimental design to determine the optimum conditions for the dissolution of nonsulfide zinc ores in ammonium carbonate solution for high recovery of zinc and to minimize the extraction of iron and lead The experimental conditions were studied in the range of 35−75 °C for reaction temperature T 300−800 rpm for stirring speed R 2−4 mol for
Get PriceThe experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution to recover copper from the flotation tailings of waste copper oxide residue The main copper minerals contained in the flotation tailings are chrysocolla malachite and cuprite with the copper grade of 1 12% Effects of lixiviant concentration solid‐to‐liquid ratio stirring speed and
Get PriceCopper was leached from tailings and ore using an ammonium carbonate solution Benedict 1917; Eddy 1919; Benedict and Kenney 1924 In 1924 the process was adapted to the leaching of nick el carbonate ores; Sherritt Gordon investigated the ammonia process for leaching nickel copper cobalt flotation concentrates during the period 1946 51
Get PriceThe ultrasound leaching kinetics of gold in the thiosulfate leaching process catalysed by cobalt ammonia Hydrometallurgy 10 1016/j hydromet 2024 105426
Get PriceThe analysis of Cu distribution in pre treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing where close to 40% of the sample in weight corresponded to a soluble fraction The tailing was treated with a leaching solution for 24 h Three different
Get PriceAn icon used to represent a menu that can be toggled by interacting with this icon
Get PriceThus each of the six reactors are filled with an ammonia ammonium carbonate solution containing approximately 100 grams per liter total ammonia and between about 15 and 20 grams per liter total carbon dioxide After the reactors are filled with the ammonia ammonium carbonate solution copper metal is added and is partially oxidized
Get PriceFor oxidized copper ores ammonium chloride has also been used [17 18] The aim of this pre treatment is to achieve decrease the pH in the case of acid solutions or complex formation in the case of ammonium chloride solution; in both cases the removal of copper would favor its dissolution
Get PriceAs shown in Fig 2 first of all raw materials used in the experiment were copper concentrates with different particle sizes obtained by shaking table separation Then ammonia ammonium chloride system and glycine hydrogen peroxide system were adopted to leach copper concentrate and the concentration of copper ion was determined after dilution of leach solution
Get PriceMine tailings have been analyzed by a sequential extraction procedure after their pre treatment with a leaching solution for 24 h and electrodialytic remediation during 15 days with a constant electric field of 2 7 V cm−1 Four leaching solutions were tested H2SO4 HNO3 2 1 vol pH = 1 9; H2SO4 HNO3 2 1 vol pH = 4 2; NH4Cl 0 8M pH = 5 5 and 30% H2O2 adjusted to pH 2 with HNO3 1M
Get PriceThe results show that 43 15% of initial Zn content was extracted adopting ammonia ammonium chloride as the leaching reagent in 4 5M at 30°C for 3h with a liquid to solid ratio of 4 1 while 43 07% of Zn recovery was achieved employing ammonia ammonium carbonate as the leaching reagent at 5M 30°C and 4 1 L/S
Get PriceMay 12 2022This study presents the novel idea of a cyanide free leaching method i e glycine ammonia leaching in the presence of permanganate to treat a low grade and copper bearing gold tailing Ammonia played a key role as a pH modifier lixiviant and potential catalyst as cupric ammine in this study
Get PriceJul 1 2022The extraction of copper was 210 3 and 277 6 mg/L when the addition of NH 4 were 0 1 and 0 2 mol/L respectively after leaching for 15 days However the copper extraction gradually decreased when the concentrations exceeded 0 2 mol/L which indicated that 0 2 mol/L was the optimal concentration Download Download high res image 725KB
Get PriceThe SAIMM Hydrometallurgy Conference 2024 will bring together internationally and locally recognized experts industries R&D establishments academia as well as students to explore how future metal demands can be met through modern hydrometallurgical technologies that can ☛ Assist in sustainable metal extraction ☛ Lower energy costs
Get PriceWhen malachite was affected by ammonium sulfate and sodium sulfide the concentration of copper ion in the solution was reduced by two orders of magnitude compared with that in pure water and
Get PriceThe Effect of Anodic Potential on Surface Layers of Chalcopyrite During Ammonia ammonium Chloride Leaching Treatment of Arsenic Sulfide Sludge for Arsenic Stabilization and Copper Extraction Study of the Rate Controlling Steps in the Removal of Magnesium Impurities in Hydrogen Assisted Magnesiothermic Reduction of TiO2 by Leaching
Get PriceThe invention discloses a method to prepare copper sulphate by copper concentrate adding built additive to the copper concentrate powder to make the iron in the copper concentrate and the additive form a basic iron sulphate double salt deposit difficult to dissolve in dilute sulphuric acid solution when leaching copper sulphate of copper calcining the deposit is eliminated with the residue
Get PriceApr 01 2024· The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution to recover copper from the flotation tailings of waste copper oxide residue The main copper minerals contained in the flotation tailings are chrysocolla malachite and cuprite with the copper grade of 1 12%
Get PriceThe leaching kinetics of hemimorphite Zn4Si2O7 OH 2·H2O in ammonium chloride solution was presented in detail Effects of stirring speed 150 350 rpm leaching temperature 75 108 °C particle size of hemimorphite 45 150 μm and the concentration of ammonium chloride 3 5 5 5 mol/L on the zinc extraction rate were studied The zinc extraction rate enhanced slightly with the
Get PriceBronsted acids; Lewis acids; ammonia; ammonium; catalysts; catalytic activity; cement; chemical reduction; kilns; nitric oxide; spectroscopy; sulfates; sulfur dioxide; temperature; vapors Abstract Two commercial catalysts at different temperatures were selected with cement kiln ash physically loaded on them to investigate the ash and alkali
Get Priceminutes 1 hour 3 hours 6 hours and 12 hours In consequence of the leaching experiments the highest extraction rate was obtained as 76 66% using 7M NH 3 solution with 12 hours of treatment Keywords Smithsonite ammonia leaching 1 Introduction Lead and zinc are two of the most widely used commodities and have a big importance for industry
Get PriceIn situ leaching ISL / Solution Mining Solution mining includes both borehole mining such as the methods used to extract sodium chloride or sulfur and leaching either through drillholes or in dumps or heaps on the surface 2 February 2024 Prof Dr H Z Harraz Presentation Mining Methods Surface mining 65 ISL salt mine ISL sulfur mine Hot
Get Price