Acid Leaching Process Nickel

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

The influence of sulfuric acid concentration (0.5, 1 and 3 M H2SO4) on the extracted Ni (%, wt.) was studied. The leaching process intensified by magnetic stirring at different temperatures (298, 323, 348 and 363 K) in the time interval of 120 min. was performed. The results were used for kinetic analysis of the leaching process.

A review of the literature over the past 30 years on the processing of nickel laterites by high temperature acid leaching has been carried out to provide a better understanding of the mineralogy, leaching process chemistry and effect of operating conditions on nickel recovery, residue properties and scaling.

of processing of lateritic nickel ores in various leach media. Direct sulphuric acid pressure leaching is the process to recover nickel and cobalt from lateritic ores. 1.Nickel Laterite Processing Nickel Iron Scribd. Acid leaching of nickel laterite ores at atmospheric pressure has been pioneered by BHP Billiton, who ...

This process of leaching is termed as high-pressure acid-leaching process or HPAL process, which is highly selective to nickel and cobalt. A pressure leaching autoclave is used in this process that receives the hot feed slurry through positive displacement slurry pump and maintains the slurry residence time between one and two hours.

High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the …

nickel leaching processes, including: 1) chlorine leaching by chlorine gas; and 2) pressure leaching by oxygen gas. (1) Chlorine leaching is a well-known selective nickel leaching process with high efficiency, which has been widely used for nickel cathode production.1) However, for safe and environmentally friendly production,

The obvious acid leaching process, viz. digestion with acid to produce H2S and a nickel salt, has not been used at all, simply because the reaction does 362 not go to completion. For example, Kambalda nickel concentrates yield only 10% of their nickel into solution even with prolonged leaching using an excess of mineral acid.

Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt therefrom. However, in order to obtain good extraction from these ores, prolonged treatment using acid of high strength and also using high pressures and recycling steps have been necessary. In the improved method of the invention nickel and cobalt is solubilized from high-magnesia ...

Whittington and Muir (2000) described the acid leaching process for recovery of nickel from the clay-based laterites. Authors reviewed the chemistry and precipitation of iron, ...

The process uses sulfuric acid, which does not require high-cost facilities. However, selective nickel leaching from MS, which was the process development goal, could not be achieved. This result is quite different from the case of selective Zn leaching from ZnS. The mechanism of nickel leaching from MS using sulfuric acid was identified.

D. Marshall and M. Buarzaiga, “Effect of Magnesium Content on Sulfuric Acid Consumption During High Pressure Acid Leaching of Latente Ores”, International Latente Nickel Symposium, W.P. Imrie and D.M. Lane, Eds., The Minerals, Metals and Materials Society, Charlotte, North Carolina, USA, March 14–18, (2004), 307–316. Google Scholar

Nickel and copper values are separately recovered from coppernickel-sulphide matte by means of a multi-stage acid leach process. The matte is treated in a first leaching stage in which the acid to acid-reactive metals molar ratio and leaching time are controlled to selectively extract the bulk of the nickel values while the copper values remain in the leach residue.

High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the …

18-06-2020· Article; Open Access; Published: 18 June 2020 Efficient Synchronous Extraction of Nickel, Copper, and Cobalt from Low–Nickel Matte by Sulfation Roasting‒Water Leaching Process

Sulfuric acid leaching of limonite is performed at high temperatures (240-270°C) in acid resistant titanium lined autoclaves. At this temperature, equilibrium vapor pressure reaches 33-35 atm. Typical operating parameters for autoclave leaching are: pulp density of 25-35% solids, 30-90 minutes residence time, 246°C to 270°C, 200-520 kg/t of acid consumption per dry ore and 3800-5400 kPa ...

treat all types of nickel laterite ores, in a single flow sheet to produce a number of final saleable products. The key to the Process is the use of nitric acid as the leaching agent and the subsequent use of a patented recovery and recycling process returning +95% of the nitric acid …

High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the …

A typical process for autoclaves is high-pressure acid leaching (HPAL), which is often used to extract nickel from laterite ore bodies, but it can also be applied in copper and cobalt production. Neles™ has a wide range of valves and services for HPAL process.

example, the prospects for using hydrochloric acid are reviewed by Harris et al. (2009) and a process based on nitric acid, termed as the DNi Process (McCarthy and Brock, 2015) has been described Teir et al. (2007) found sulfuric acid to be more efficient than hydrochloric and nitric acid nickel leaching …

Title: High Pressure Acid Leaching of Nickel Laterite Ores: Chemistry and MOC Challenges 1 High Pressure Acid Leaching of Nickel Laterite Ores Chemistry and MOC Challenges. Mohamed Buarzaiga ; IAPWS Workshop ; May 12, 2009; 2 Presentation Outline

of process of Professor M.H. Caron 15-17 scribed above as pro-cess of Sherritt Gordon Mines Ltd. Caustic soda has been proposed as a leaching agent by sian 18,19 and Japanese 20 workers to recov-er nickel, cobalt and arsenic (c) Many \vorkers have investigated the process of sulphuric acid leaching nickel ores and concentrates.

Sixty grams (60 gr) of nickel laterite sample (particle size : -70 + 100 mesh or -200 mesh) was then put into the reactor. The stirrer speed was set constant at 400 rpm during the leaching process. Each run of the leaching process was performed for 4 hours. Samples of

Sulfuric acid leaching of limonite is performed at high temperatures (240-270°C) in acid resistant titanium lined autoclaves. At this temperature, equilibrium vapor pressure reaches 33-35 atm. Typical operating parameters for autoclave leaching are: pulp density of 25-35% solids, 30-90 minutes residence time, 246°C to 270°C, 200-520 kg/t of acid consumption per dry ore and 3800-5400 kPa ...

nickel to its trivalent state can be largely prevented while oxidation of the cobalt and manganese proceeds quickly. By controlling the acid addition, the leaching of divalent nickel and other impurities can be controlled [5]. Figure 1. Process flow diagram for the selective acid leach process to refine mixed Ni-Co hydroxide

The resultant carbon monoxide is re-circulated and reused through the process. The highly pure nickel produced by this process is known as "carbonyl nickel". Source: Nickel-Wikipedia; Hydrometallurgy of Nickel; The high temperature (~250°C) acid pressure leaching of nickeliferous laterite ore has been practised commercially since the late 1950's.

treat all types of nickel laterite ores, in a single flow sheet to produce a number of final saleable products. The key to the Process is the use of nitric acid as the leaching agent and the subsequent use of a patented recovery and recycling process returning +95% of the nitric acid …