Ammonia leaching process for selective extraction of nickel …
Currently, reduction roasting ammonia leaching (Caron process) and high pressure sulfuric acid leaching (HPAL) are the mainstream processes for the hydrometallurgical treatment of limonite laterite ore [8], [9]. The main process steps in the Caron process are reduction roasting, atmospheric ammonia leaching, ammonia …
Recovery of rare earths from bauxite residue slag by high-pressure acid …
The recovery of rare-earth elements from an alumina and silica rich slag produced during the smelting reduction process of bauxite residue was studied. The slag was leached with sulfuric acid at ...
high pressure acid leaching for extraction rock asphalt
high pressure acid leaching for extraction rock asphalt We provide crushing & grinding products and solutions . CRM Mining Crusher is a Porland company with facilities in Europe and Africa that manufactures and installs crushing, grinding, and screening equipment and spare parts for mining, quarrying and demolition operations.
The Use of Acid Leaching to Recover Metals from Tailings: A …
Subsequently, the influence of pyrite on copper leaching was explored. High-pressure leaching tests examined factors like acid concentration, oxygen pressure, temperature, pulp density, free acid, and iron precipitation. Conducted in a 2 L autoclave, the experiments revealed that using distilled water resulted in 98.1% Cu and 67.4% Fe …
Leaching behavior of metals from limonitic laterite ore by high …
The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt. The effects of sulfuric acid added, leaching temperature, leaching time and liquid/solid (L/S) ratio on metals extraction were examined. ... Key words: high …
(PDF) ERES 2014
Jul 2020. Srđan Stanković. Srećko Stopić. Miroslav Sokić. Bernd Friedrich. View. Show abstract. PDF | On Sep 4, 2015, Şerif Kaya and others published ERES 2014 - HIGH PRESSURE ACID LEACHING ...
HIGH PRESSURE SULPHURIC ACID LEACHING OF …
In high pressure acid leaching processes, lateritic nickel ores are interacted with aqueous sulphuric acid solutions in acid resistant autoclaves at temperatures of 230-270 °C and under pressures of 3.3-5.5 MPa for 60-180 minutes. Under these leaching conditions, iron mainly follow a dissolution-precipitation path, forming insoluble solid ...
HPAL: Upping The Pressure
High Pressure Acid Leaching HPAL is the most widely adopted technology for processing lower grade limonite ores, particularly given the Caron process is no longer seen as …
Valuable metals substance flow analysis in high …
High-pressure acid leaching (HPAL) and atmospheric acid leaching (AL) are the −. two prevailing technologies for hydrometallurgical processing of laterites [16 − 21]. Although …
High pressure acid leaching: a newly introduced …
This study is aimed to assess the potential implementation of High-Pressure Acid Leaching (HPAL). HPAL is a proven technology but not utilized in Indonesia due to …
Exploration, Mining, Milling and Processing of Uranium
The yellow cake product precipitated from alkaline leaching circuits is always of higher grade than the final product obtained from acid leaching. As the operating cost of alkaline leaching is relatively high, this technology is traditionally used for uranium ores of higher grade. Table 2.5 gives comparison of acid and alkaline leaching of uranium.
Selective and efficient extraction of lithium from …
The traditional process has the disadvantages of high acid consumption, high extraction rate of impurities and difficult purification of leach liquor. ... The optimal conditions for nitric acid pressure leaching are as follows: temperature of 200 °C, initial nitric acid concentration of 1 mol/L, liquid-to-solid ratio of 2.5 mL/g, and holding ...
Extraction of scandium from bauxite residue by high-pressure leaching …
This study discusses the extraction of scandium from bauxite residue as a by-product from an alumina refinery through High-Pressure Acid Leaching (HPAL) in sulfuric acid solution. The high-pressure leaching in sulfuric acid could effectively dissolve scandium, with minimum silica gel formation and relatively lower co-extracted iron …
Extracting vanadium from stone-coal by oxygen pressure acid leaching
When the direct acid leaching method is adopted, high acid concentration (6 mol/L or higher) is usually needed [16] and other conditions, such as high temperature and high pressure, are also ...
Selective leaching of nickel and cobalt from sintered nickel …
In this work, oxygen pressure acid leaching is implemented to augment the leaching efficiency of valuable metals from sintered nickel alloy. Techniques investigation shows that NiO in the sample and NiO coated by Ni 2 O 3 impede the ongoing dissolution of nickel during atmospheric acid leaching. The nickel oxides undergo conversion into …
Development of copper recovery process from flotation …
Therefore, this research aims to develop a copper recovery process from flotation tailings using high‒pressure leaching (HPL) followed by solvent extraction. Over 94.4% copper was dissolved from the sample (CuFeS 2 as main copper mineral) by HPL in a H 2 O media in the presence of pyrite, whereas the iron was co‒dissolved with copper ...
Comparative atmospheric leaching characteristics of scandium …
Scandium together with Ni and Co are usually leached by the high pressure acid leaching method, then concentration and separation of scandium from the pregnant leach solution (PLS) by using the pH-controlled precipitation method (Kaya et al., 2017) or solvent extraction method (Ferizoglu et al., 2018). However, as the grade of laterite …
Extraction of vanadium from vanadium slag by high pressure …
To extract vanadium in an environment friendly manner, this study focuses on the process of leaching vanadium from vanadium slag by high pressure oxidative acid leaching. Characterizations of the raw slag, mineralogy transformation, and the form of leach residues were made by X-ray diffraction, scanning electron microscopy, and …
Optimisation of nickel extraction from laterite ores by high pressure …
Extraction of nickel from Western Australian laterite ores via sulphuric acid leaching at 250. °C has been optimised by the addition of sodium sulphate.. Leaching of a nontronitic nickel laterite ore in fresh water, with a sulphuric acid loading of 420 kg/t ore extracted 93% of nickel from the ore.When limonitic nickel laterite ore was leached in …
Separation and recovery of scandium from high pressure sulfuric acid
More than 99% of vanadium was selectively adsorbed from the hydrochloric acid leaching solution under the conditions of pH value of 1.8, volume ratio of leaching solution to resin of 10, and flow ...
Recovery of scandium from silicate minerals by high-pressure leaching …
Hence, high-pressure acid leaching was first used in the Moa plant of Cuba, and the recovery ratio of Ni and Co can reach more than 90% during the treatment of limonite laterite nickel ore. 24 Subsequently, the high-pressure acid leaching was used in the recovery of Ni and Co from RAMU lateritic ore by Shi, 25 and the 96% and 94% …
A new method of full resource utilization of copper slag
Fig. 4 (b) demonstrates the leaching efficiency of iron, copper, zinc, cobalt and nickel ions in acid solutions of different concentrations, when the leaching time is 2 h at 90 °C and the sulfuric acid dosage is kept at 0.096 mol. It can be seen that when the sulfuric acid concentration is 3 mol/L, the leaching efficiency of Fe, Cu, Zn, Co and ...
High pressure acid leaching of a refractory lateritic nickel ore
Abstract and Figures. This paper describes the experimental findings of the extraction of nickel and cobalt by high pressure acid leaching (HPAL) of a refractory limonitic nickel laterite ore from ...
High pressure acid leaching: a newly introduced technology …
This study is aimed to assess the potential implementation of High-Pressure Acid Leaching (HPAL). HPAL is a proven technology but not utilized in Indonesia due to the high investment, and it requires a large media for waste disposal. Nickel limonite ore with grade 1.1 – 1.4 % can be processed using HPAL technology to produce more than …
Selective rare earth element extraction using high-pressure acid
@article{Rivera2019SelectiveRE, title={Selective rare earth element extraction using high-pressure acid leaching of slags arising from the smelting of bauxite residue}, author={Rodolfo M. Rivera and Buhle Sinaye Xakalashe and Ghania Ounoughene and Koen Binnemans and Bernd Friedrich and Tom Van Gerven}, …
The HPAL Process :: Total Materia Article
High-pressure acid leaching (HPAL) is being used for the recovery of nickel from nickel laterite ores, and increasingly atmospheric leaching is also being considered. As mentioned above, major reserves of nickel are …
HIGH PRESSURE ACID LEACHING
the last decade, high pressure acid leaching (HPAL) in autoclaves has become the technologically preferred method for processing gold present in sulfide minerals. AL autoclaving entails subjecting the acidic ore to temperatures up to HP 250°C with …
Pressure leaching of aluminum from kaolin by HCl
Before extraction, kaolin was calcined with NaCl at 700 °C for 3 h. The percentage of alumina extracted was 79.3% after leaching in 5.33 M H 2 SO 4 for 3.75 h, at a temperature of 140 °C under reflux conditions. Eventually, Al (OH) 3 was precipitated using CO 2 after the treatment of the leach liquor with NaOH.
Recent Progress in Hydrometallurgical Processing of Nickel …
HPAL needs an autoclave for high-pressure and temperature leaching reaction, whereas AL can occur at atmospheric pressure. HPAL and Caron processes become less attractive due to high capital expenditure and energy consumption . AL needs high acid consumption and has slower extraction kinetics than HPAL . Hydrochloric …
Extraction of scandium from bauxite residue by high-pressure leaching …
These results indicate that high-pressure acid leaching gives a high recovery of scandium with higher selectivity to iron and lower acid requirements than direct acid leaching at atmospheric pressure that yields extracted scandium of 80% with an iron co-extraction of about 60% [32]. In addition, the leaching with inorganic acid at …
