B. Ma, W. Yang, Y. Pei, C. Wang, B. Jin, Effect of activation pretreatment of limonitic laterite ores using sodium fluoride and sulfuric acid on water leaching of nickel and cobalt, Hydrometallurgy, Vol. 169, 2017
The result shows that the proposed simple kinetics model fits appropriately at lower reaction temperature, but does not agree at higher temperature (more than 60°C). The reaction rate constants is in the range of (3.307–9.634) × 10 −6 L.mol −1 .s −1, in which its collision factor and activation energy are 286,768 gram.mol −1 .min ...
Yabulu, The Queensland Nickel refinery, commissioned in late 1974, is based on the Caron reduction roast, ammonia- ammonium carbonate leach process for nickel laterite ores. This paper reports some observations Qf ore treatment in the hydrometallurgical circuit of the plant and where appropriate, compares these with the original laboratory ...
Nickel sources come from nickel sulfide ores and nickel oxide ores (laterite). Nickel content in laterite ore is 1.5-2.5 % (weight basis), lower than the nickel content in sulfide ores. Indonesia is one of the major nickel producers with laterite nickel ore reserves …
Modelling of Thin Layer Solar Drying Kinetics and Effective Diffusivity . . . . 2145 Journal of Engineering Science and Technology August 2017, Vol. 12(8) content at any time of drying. These formulas contain constants that are adjusted to reconcile the theoretical predictions with experimental curves of drying.
Hydrometallurgical process of laterite nickel ore is carried out by leaching techniques at high temperatures. At atmospheric temperatures, the acquisition of nickel is low. Therefore, this study aims to characterize the electrochemical laterite nickel ore using a solution of sulfuric acid and hydrochloric acid at atmospheric temperature.
This research describes the heterogeneous catalytic reactions of H2O2 with granular size goethite (α-FeOOH) particles in aqueous solution under various experimental conditions. This is an important reaction for the environment since both H2O2 and iron oxides are common constituents of natural and atmospheric waters. Furthermore, iron oxides function as catalysts in chemical oxidation ...
Sep 01, 2020· Ore grades of available primary ores are decreasing and there is an increasing interest and demand for novel "technology metals", for example, in renewable energy technologies, such as wind turbines, solar photovoltaic cells, electricity grids and batteries (European Innovation Partnership on Raw Materials, 2018).
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Ginger, the underground stem or rhizome of the plant Zingiber officinale Roscoe (Musales Zingiberaceae), has attracted widespread attention for its medicinal properties. Though it is native to tropical Asia, it is now grown as a commercial crop in
Transformation and leaching kinetics of silicon from low-grade nickel laterite ore by pre-roasting and alkaline leaching process. Transactions of Nonferrous Metals Society of China 2018, 28 (1), .
The drying rate of crumb natural rubber was significantly improved five folds with microwave-convective drying i.e. from 0.012 g H2O/g dry matter. min to 0.06 g H2O/g dry matter. min, whereas 89% ...
May 01, 2010· Saprolitic laterite ores were leached at different temperatures under the experimental conditions of particle size d 50 = 25 μm, 10% (v/v) H 2 SO 4, liquid to solid ratio 3 mL g −1 and stirring at 500 rpm. Examination of plots of the above kinetics equations as functions of time showed that only Eq.
Mar 11, 2018· In this study, microwave heating was used to dry the nickel laterite which contains plenty of free water, crystal water and hydroxy water. The results showed that compared with the conventional drying process, the microwave drying greatly improved the drying efficiency of nickel laterite.
Aug 15, 2006· Many solid-state kinetic models have been developed in the past century. Some models were based on mechanistic grounds while others lacked theoretical justification and some were theoretically incorrect. Models currently used in solid-state kinetic studies are classified according to their mechanistic basis as nucleation, geometrical contraction, diffusion, and reaction order. This work ...
The Analysis of Nickel Laterite Ore Applied Rigaku Technologies Laterite ore is the source of 70% of the global supply of nickel. During mining a fast and simple means of determining and monitoring oxide and elemental composition of the ore material is important for …
International Journal of Food Sience and Technology, 2010, 45: . [14] Pickles C A. Drying kinetics of nickeliferous limonitic laterite ores [J]. Minerals Engineering, 2003, 16: 1327- 1338. [15] Mohamed L A, Kane C S E, Kouhila M,et al. Thin layer modelling of Gelidium sesquipedale solar drying …
Solar Drying Kinetics of Date Palm Fruits 293 Journal of Engineering Science and Technology September 2009, Vol. 4(3) Nomenclatures A o, A 1, b Fitting coefficients k Drying parameter R Universal constant of perfect gases, J/mol.K Rh Relative humidity, % r Determination coefficient SEE Standards errors values T Temperature, °C t Time, s v Air velocity, m/s
Many solid-state kinetic models have been developed in the past century. Some models were based on mechanistic grounds while others lacked theoretical justification and some were theoretically incorrect. Models currently used in solid-state kinetic studies are classified according to their mechanistic basis as nucleation, geometrical contraction, diffusion, and reaction order.
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The electrochemical passivation of pure Fe in ammoniacal solution was investigated to determine the stability of both Fe-oxides and Fe-ammines during anodic polarization. The potentiodynamic experiments were done in 6M total NH₃[3M NH₄OH and 1.5M (NH₄4)₂CO₃] solution. Different experimental parameters such as temperature (15°, 25°, 35°, 45° and 55°C) and pH (6, 8, 10 and 12 ...
Ginger, the underground stem or rhizome of the plant Zingiber officinale Roscoe (Musales Zingiberaceae), has attracted widespread attention for its medicinal properties. Though it is native to tropical Asia, it is now grown as a commercial crop in