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chemical in nickel leaching mineral

chemical in nickel leaching mineral

Acid leaching of nickel from dunite rock. any definite nickel bearing minerals, (iii) variability of mineral, and hence chemical content, thus requiring a technique 'l rhich does not demand a rigid feed analysis, and (iv) high water content, both free and chemically bound, which may be up to 40% of the total ore weig4t. To

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Atmospheric pressure leaching of nickel from a low-grade ...

2018-6-27  2Fe3+ + 3H2O = Fe2O3 + 6H+ (4) Nickel is also released in the solutions during acid leaching of the calcine from reduction roasting and iron dissolution by equation (1). The dissolved ferrous iron is oxidized to ferric iron (Eq. 2), which immediately undergoes hydrolytic reactions (3) and (4) (i.e. the conversion of soluble iron to insoluble FeOOH and Fe2O3). The acid consumed by the leaching of FeO in reaction (1) is

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Leaching of nickel from a secondary source by sulfuric ...

2017-8-1  The results showed that leaching of about 99% of nickel content of the washed tailing could be achieved using 4.0 mol sulfuric acid, pulp density of 1/20 gmL −1 and particle size of −180 +250 mm at 80 °C after 240 min. Kinetic analysis of the leaching data properly followed the shrinking core model, and the dissolution rate of nickel was found to be controlled by diffusion through the product layer for 25 and 40 °C

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(PDF) Mineral Leaching of Non-sulphide Nickel Ores Using ...

Losses of soluble nickel in the fungal biomass were found to be 3.5–10.8%. Chemical analysis of the leach liquors showed the presence of significant amounts of citric, oxalic and other organic...

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Advances in microbial leaching processes for nickel ...

2015-7-21  phases. The nickel-bearing lateritic minerals do not contain dis-tinct nickel phase; rather nickel is embedded or interlocked in the secondary oxides of iron and silicate minerals [4]. Therefore, nickel laterites are broadly classified into limonite and saprolite types based upon the chemical nature of the nickel-bearing host minerals

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The effects of mineralogy on the biological leaching of ...

2001-12-1  TABLE 1 Chemical analysis of laterite minerals Sample Ni CO Fe Mn Mg Si (Wt %) (Wt %) tWt%) (Wt%) (Wt%) (Wt%) Limonite 1.49 0.2 39.8 0.98 2.8 9.4 Weathered Saprolite 2.25 0.035 8.1 0.13 15.8 34.9 Chemical leaching To effect the leaching achieved by heterotrophic microorganisms, controlled chemical leaching experiments with citric acid were ...

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Atmospheric acid leaching of nickel- copper matte from ...

2009-8-26  the nickel and copper mineral phases were intergrown, with copper minerals always present in nickel minerals and vice versa. Figure 2 shows images of a matte particle taken after 5 hours of leaching. It can be seen that the nickel alloy was leached out of the matte particle, leaving holes in the particle.

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SEQUENTIAL LEACHING OF NICKEL LATERITE ORES

found to be nickel-barren from elemental analysis of the liquor and solid elemental analysis (Table 2), indicates that there was no leaching of any other minerals less than 10%). Because the percentage compared to the original, it can be assumed that soluble amorphous (nickel-barren) mineral. 0 10 20 30 40 50 60 70 80 6 as determined by QXRD

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Roasting and Leaching Behavior of Nickel Laterite Ore ...

2021-3-29  Nickel in laterites is hosted in many different compounds such as oxides, hydroxides, and silicates minerals. The sulfation-roasting-leaching process has the potential to change this scenario once it can be applied to all kinds of nickel laterite ores and does not consume much acid, as

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LEACHING OF NICKEL LATERITE WITH A SOLUTION OF

2015-7-1  The most significant variable effect on leaching of nickel was the ammonia concentration. The maximum dissolution of nickel from the unroasted ore was 11.90% at 4 M NH 3, 100 oC, 2 M (NH 4) 2 CO 3 and 2 bar O 2 pressure. Optimization from the leaching data was done using response profiling and desirability in Statistica software.

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(PDF) Mineral Leaching of Non-sulphide Nickel Ores Using ...

Organic acids that are excreted by microorganisms dissolve nickel from lateritic ores. In chemical leaching experiments, fifteen organic acids were tested in the concentration range of 0. 05 - 0. 5 M.

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The effects of mineralogy on the biological leaching of ...

2001-12-1  TABLE 1 Chemical analysis of laterite minerals Sample Ni CO Fe Mn Mg Si (Wt %) (Wt %) tWt%) (Wt%) (Wt%) (Wt%) Limonite 1.49 0.2 39.8 0.98 2.8 9.4 Weathered Saprolite 2.25 0.035 8.1 0.13 15.8 34.9 Chemical leaching To effect the leaching achieved by heterotrophic microorganisms, controlled chemical leaching experiments with citric acid were ...

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Stirred-tank bioleaching of nickel and cobalt from ...

Stirred-tank (bio)leaching experiments were conducted over a range of pH and temperature conditions; with 80 to 90% and 70 to 80% leaching of nickel and cobalt respectively in 10 days at T ≥ 40 °C Bioleaching at elevated pH (3 compared to 1.6 2) is favourable for reduction of both

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LEACHING OF SOME SULPHIDE MINERALS OF NICKEL

2015-5-22  recovery after pentlandite, mainly because pyrrhotite is an abundant mineral in nearly all sulphide nickel ores, much more abundant, in fact, than the nickel minerals themselves. Hydrometallurgy of nickel sulphides then, mainly deals with the extraction of nickel from these two minerals.

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Leaching of Low- Grade Nickel Ores by Fungi Metabolic

2020-10-13  Leaching of Low- Grade Nickel Ores by Fungi Metabolic Acids Jessica Tang Marjorie Valixy Department of Chemical Engineering, University of Sydney, NSW, 2006, Australia yDepartment of Chemical Engineering, University of Sydney, NSW, 2006, Australia, [email protected] This paper is posted at ECI Digital Archives.

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Acid extraction of molybdenum, nickel and cobalt from ...

The optimal leaching conditions were a three-stage successive leaching at 80 °C with a leaching time of 2 h and S/L ratio of 0.25 g L(-1). Under these conditions, the achieved mineral sludge sample leaching yields were 85.5%, 40.5% and 93.8% for Mo, Ni and Co, respectively.

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Pressure Acid Leaching of Nickel Laterites: A Review ...

2018-6-10  Abstract. 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.

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TREATMENT AND RECOVERY OF NICKEL RICH

2008-6-5  chemical analysis of dissolved species was performed by Atomic Absorption Spectrometer (AAS). 3. Results and discussion 3.1. Effect of leaching time and H2SO 4 concentration The effect of leaching time on the dissolution amount of nickel and other main metals in PPFW, leached with 1N H2SO 4 at 24 °C, is shown in Fig. 2. As seen from Fig. 2,

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Mineral-leaching chemical transport with runoff and ...

2020-6-9  mineral-leaching chemical ammonium sulfate in runoff and sediment poses a serious environmental threat to down-stream water bodies. In this paper, the characteristics of mineral-leaching chemicals in surface soil samples col-lected in the field were studied. In addition, NHC 4 and SO2 4 transport via soil erosion was monitored using runoff

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STIMULATION OF CHEMICAL AND ELECTROCHEMICAL LEACHING

2021-4-1  A method of chemical and electrochemical gold leaching from a refractory concentrate is scientifically substantiated and tested in [24, 25]. This method is based on the use of sodium chloride solution electrochemically treated in an undivided cell (without membrane separation of the electrode space) as a solvent, after treatment it is characterized by activated chlorine content up to 2 g/dm 3.

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(PDF) Mineral Leaching of Non-sulphide Nickel Ores Using ...

Organic acids that are excreted by microorganisms dissolve nickel from lateritic ores. In chemical leaching experiments, fifteen organic acids were tested in the concentration range of 0. 05 - 0. 5 M.

More

LEACHING OF SOME SULPHIDE MINERALS OF NICKEL

2015-5-22  recovery after pentlandite, mainly because pyrrhotite is an abundant mineral in nearly all sulphide nickel ores, much more abundant, in fact, than the nickel minerals themselves. Hydrometallurgy of nickel sulphides then, mainly deals with the extraction of nickel from these two minerals.

More

Stirred-tank bioleaching of nickel and cobalt from ...

Stirred-tank (bio)leaching experiments were conducted over a range of pH and temperature conditions; with 80 to 90% and 70 to 80% leaching of nickel and cobalt respectively in 10 days at T ≥ 40 °C Bioleaching at elevated pH (3 compared to 1.6 2) is favourable for reduction of both

More

Pressure Acid Leaching of Nickel Laterites: A Review ...

2018-6-10  Abstract. 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.

More

TREATMENT AND RECOVERY OF NICKEL RICH

2008-6-5  chemical analysis of dissolved species was performed by Atomic Absorption Spectrometer (AAS). 3. Results and discussion 3.1. Effect of leaching time and H2SO 4 concentration The effect of leaching time on the dissolution amount of nickel and other main metals in PPFW, leached with 1N H2SO 4 at 24 °C, is shown in Fig. 2. As seen from Fig. 2,

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Effect of Agitation Speed and Leaching Time for Nickel ...

2021-4-22  This research work deals with atmospheric citric acid leaching of limonite ore from Morowali, Central Sulawesi by applying agitation speed and leaching time parameters. The composition of limonite ore treatment was characterized by X-Ray Fluorescence (XRF) method. Its containt dominated by iron 84.2 % and enrichment nickel content up to 5.15 %.

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Study on leaching kinetics of laterite ore using ...

2019-5-10  probabilities between iron minerals and the leaching solution. Table 1. Chemical composition of raw ore Constituent NiO CoO MnO Fe 2O3 CuO MgO Al 2O 3 SiO 2 Content (wt.%) 0.60 0.042 0.171 15.01 0.007 26.4 0.34 57.43 Table 2. The distribution of nickel in main minerals of the ore Ni phase Goethite Limonite Sulfide Lizardite Total

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Kinetics of nickel leaching from low-nickel matte in ...

2021-5-24  The hydrogen sulfide emitted in the leaching process of low nickel matte can be used to prepare sulfur by Claus method, which has been widely applied in chemical industry.

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ALTA 2017 Nickel-Cobalt-Copper Proceedings

2019-3-15  ore leaching, uranium ore processing, copper SX-EW, heap leaching and solvent extraction. Conferences . ALTA conferences are one of the world’s premier annual metallurgical events. ALTA 2018. is the 23. rd. annual conference and will be held 1926- May in Perth,

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Mineral-leaching chemical transport with runoff and ...

2020-6-9  mineral-leaching chemical ammonium sulfate in runoff and sediment poses a serious environmental threat to down-stream water bodies. In this paper, the characteristics of mineral-leaching chemicals in surface soil samples col-lected in the field were studied. In addition, NHC 4 and SO2 4 transport via soil erosion was monitored using runoff

More