SpletShrinking core model Matrix acidizing The liquid–solid heterogeneous non-catalytic reaction between acid and minerals is the foremost principle of matrix acidizing. Previous mathematical models failed to describe the acidetching issue of rock particle clusters with the property of fractal surface in a three-dimensional space. SpletIn this study, the shrinking core model was evaluated against experimental data for laterite leaching process using a solution of low concentration nitric acid (0.1 M). Variations in temperature and particle size were carried out at 303–358 K and <75–250 microns.
Sulfuric Acid-Oxygen Leaching for In-Situ Extraction of Copper …
Splet以还原反应为例说明缩核模型。还原反应是典型的气一固相反应，且由外向内逐步推进。被还原的矿石内部存在一个由未反应物组成的，不断缩小的核心，直至反应结束。 SpletHydrometallurgy. Volume 71, Issues 3–4, January 2004, Pages 435-446. ... Experimental data fit well into a developed model based on the shrinking core model approach in which a variable activation energy term was introduced. Kinetic analysis of the experimental results reveals that the associated energy and the rate-controlling mechanism are ... recept za oblande sa orasima i mlekom
Predictive Models of Leaching Processes: A Critical Review
SpletThere has been a substantially increasing demand for energy critical elements (ECEs) in recent years as energy-related technology has advanced rapidly. Spent catalysts are known as potential... Splet27. okt. 2014 · Fig 1c demonstrates schematic of a model called Shrinking Core-Shrinking Particle. In this case as the reaction proceeds, the unreacted core of particle shrinks while a gelatinous silica layer forms around the core. However, since this layer is soft, it breaks apart when the particles collide. SpletThe kinetic exchange of SO42− ions with CO32− ions in natural strontium sulfate (celestite) single crystals under alkaline hydrothermal conditions was investigated. The Experiments were performed at several temperatures ranging from 423 to 523 K for different reaction times between 1 and 96 h with molar ratios of CO32−/SO42− = 1, 5 and 10. Structural … du yeoja 2010