— Effect of Leaching Temperature. The results show enhanced Ni/Co/Sc release in the pregnant leach solutions when subjected to higher leaching temperatures for a longer time. This is suggestive of the highly temperature-dependent leaching behavior of the system, which is also chemical reaction-controlled in nature.
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Abstract: Results of an analysis of the operating data of an ash leaching system show that the sys- tem removed 90% of the chloride (Cl) and 82% of the potassium (K) introduced to the system with ...
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— This results in a high acid consumption and high iron concentration in the pregnant leach solution. In this study, the leaching behavior of nickel and co-dissolution of iron and magnesium in a mixture of citric acid and sulfuric acid were investigated and compared with those using an individual acid.
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2 INTRODUCTION There are three practiced methods to concentrate and purify nickel and cobalt from pregnant (acid) leach solution in the hydrometallurgical processing of nickel ores.
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— The objective of this study was to examine the effects of soil moisture, irrigation pattern, and temperature on gaseous and leaching losses of carbon (C) and nitrogen (N) from soils amended with biogas slurry (BS). Undisturbed soil cores were amended with BS (33 kg N ha−1) and incubated at 13.5°C and 23.5°C under continuous …
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— The addition of magnesium chloride in hydrochloric acid enhances the activity of the hydrogen ion by orders of magnitude, which permit rapid leaching rates at …
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Download scientific diagram | Pregnant leach solutions (PLS) conditions from publication: High Chloride in PLS and their Impact on Copper Solvent Extraction | Due to water scarcity and lower ...
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— The recovery of crystalline silicon from diamond-wire cutting waste with microwave-assisted hydrochloric acid leaching was studied. The experimental results indicated that the optimum conditions for the hydrochloric acid concentration, liquid–solid ratio, leaching time, leaching temperature and particle size were 2 mol/l, 6:1 ml/g, 10 …
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make up reagents are also metered into the leach reactor feed hopper. The slurry is agitated by peripheral lifters and the flow of slurry through the reactor is controlled by specially designed internal baffles. The leached slurry and pregnant solution overflow from the last compartment into the discharge sump. RANDOL GOLD & SILVER FORUM …
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The following article explores the application of KLAREN self-cleaning fluidized bed heat exchangers as an ideal solution for indirect heating of laterite nickel slurry in High …
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— The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon. CIL stands for carbon-in-leach. ... This effect can be exploited in practice by performing intermediate …
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These include increasing temperature or leaching time, controlling redox potential, adding catalysts or pre-treatment to change mineral phases. 4.1. Increasing temperature or leaching time Higher temperatures improve the nickel extraction kinetics for sulphuric acid-based AL (Weston, 1974a; Canterford 1978a; Griffin et al., 2002).
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— The extracted manganese then can be separated from iron-bearing residue by settling and thickening or by centrifuging the pregnant leach slurry. The manganese concentration of the product liquor can be adjusted over a wide range by recycling a portion of the product after regeneration with SO2 or after removal of iron by one of several ...
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3.1. Effect of calcination temperature on desulfurization Fig. 2 shows that the sulfur in the high-sulfur bauxite was effectively removed by suspension calcination. The contents of ST and S 2− in the ore decrease and remains substan-tially at about 0.40wt% with the calcination temperature in-
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— The extraction of Cu (II) from ammonia pregnant leach solution (PLS) using bis(2,4,4- trimethylpentyl) phosphinic acid popularly called Cyanex®272 as an extractant in kerosene diluent was investigated. The influence of extractant concentration and equilibrium pH on the Cu (II) extraction was investigated.
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— The object of the post agitated leach drum filtration circuit is to recover as much of the dissolved gold and silver as possible. The efficiency of recovery can be increased significantly by utilizing two successive stages of filtration such as the two stage system applied in this plant. Recovery of the precious metals is also improved ...
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Then, 5 cc of pregnant leach solution was added into this mixture and the solution was homogenized by the help of a magnetic stirrer. Finally, this solution was titrated with 0.2 M sodium hydroxide solution to the initial pH level. Then, from the amount of sodium hydroxide consumed, the residual acid in the pregnant leach solution was determined.
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— By optimizing the basic HPAL process parameters: leaching at 255°C with 0.30 sulfuric acid to ore weight ratio with a particle size of −850μ for 1h of leaching, it was found that 87.3% of ...
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The use of the highly effective chloride/sulphate leach process produced a warm pregnant leach solution (PLS) high in acid, chloride and copper content, which resulted in several …
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— Since the goal of the leaching process is to get as much scandium as possible in the pregnant solution, the condition with H 2 SO 4 concentration of 1.5 M, a temperature of 200 °C, leaching duration of 1 h, and slurry density of 10% (w/w) was considered as an optimum condition for the leaching process.
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— Precipitation of scandium from pregnant leach solution of high-pressure acid leaching of nickel laterite ore and its re-leaching behavior from the precipitate January 2024 DOI: 10.1063/5.0186107
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Counter Current Decantation (CCD) thickener circuits are used to recover soluble metal as pregnant liquor solution from ore leach residue. The basis of CCD operation is to …
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— The extraction of nickel from the Serbian nickel lateritic ore by sulphuric acid leaching has been studied. Atmospheric leaching at temperatures as high as 363 K generally resulted in nickel ...
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— The characteristics of the compound in the extraction process using High Pressure Acid Leaching (HPAL) and Sulfation-Roasting-Leaching (SRL) methods are similar to the dominance of Hematite (Fe 2 O 3) and Fe content > 40%. Atmospheric leaching (AL) residues are dominated by compounds in the form of the mineral Fayalite …
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High flow and high temperature water heating applications; Patent No. 8,167,278 B2; Steam Injection Heating for Hi-Solids Slurries, ... Tailings Solvent Recovery (TSRU), mineral leach slurry heating, sludge heating, pulp stock heating, anaerobic digestion, wastewater heating, I-Series. Inline Direct Steam Injection Heater. Steam injection ...
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— To systematically discuss how to realize the high efficiency utilization of the complex non-ferrous metals resources with the high pressure oxygen leaching method, the present article reviews the current research progress of the technology performed in the separation and extraction of valuable metals from low-grade polymetallic complex ores, …
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— The present research work describes a facile and industrial-friendly procedure for producing high quality CuO nano-powder from a PLS of a low-grade chalcopyrite-ore …
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iron ore concentrate slurry with 65% solids content. The burners were installed in an existing 15 m diameter x 15 m high agitated tank. The heating improves the slurry filtration performance in the pelletizing plant. SubCom™ heaters have been used in mine water treatment to maintain the water temperature during winter months in cold climates.
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Effects of moisture and temperature on greenhouse gas emissions and C and N leaching losses in soil treated with biogas slurry Anja Sänger & Daniel Geisseler & Bernard Ludwig Received: 24 September 2010 /Revised: 30 November 2010 /Accepted: 8 December 2010 /Published online: 6 January 2011 # Springer-Verlag 2011
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— Temperature is shown to have significant impact on the leaching behaviour whilst slurry agitation rate in the range 600–1000 rpm had no noticeable effect. Ni and …
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containing solution (pregnant leach) is collected from the liner into a leach pond and sent off to carbon adsorption. The leaching process will take from 60-90 days. High grade ore is typically reserved for agitated leaching. fi nely ground ore (< 200 mesh) is combined with the cyanide solution in a series of tanks. This slurry is referred
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— Precipitation of scandium from pregnant leach solution of high-pressure acid leaching of nickel laterite ore and its re-leaching behavior from the precipitate ... of 99.81, 42.88, 36.66, and 99.88%, respectively. The best condition for Sc re-leaching was obtained at a leaching duration of 90 minutes, temperature 35°C, H 2 SO 4 concentration ...
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— High-temperature leaching is performed in an autoclave (shown schematically in Figure 2.2.5) at ~ 250 °C and 40 bar pressure. Goethite concentrate is slurried with water, steam heated to ~ 200 °C, and then fed to the autoclave.
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— It can be interpreted that to be able to achieve high gold extraction, the temperature and pH should be above 55 °C and 11.5, respectively, in the studied range of leaching conditions. Based on the predicted results, the optimal leach conditions for gold extraction chosen were 1.25 M (93.75 g/L) glycine concentration, temperature of 60 °C ...
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