Solid-liquid reaction kinetics – experimental aspects and model development

Grénman, Henrik; Salmi, Tapio; Murzin, Dmitry Yu.

doi:10.1515/revce.2011.500

Cited by 33 publications

(18 citation statements)

References 75 publications

(62 reference statements)

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“…Once more, the problematic of the evolution of the rugosity and porosity of the surface is one of the main problem which has to be dealt with when measuring the chemical dissolution reaction kinetics, whatever the method applied [34][35][36][37], since there is no method for insitu measurement of the surface evolution on such a short period of time.…”

Section: Measurement Of Dissolution Kinetics By Optical Microscopy Obmentioning

confidence: 99%

“…At this scale, the evolution of the concentration of dissolving materials in the bulk is practically impossible to relate to the chemical reaction kinetic. Indeed, it results from the complex coupled phenomena of the chemical reaction and mass transport, complicated by others elements such as the reactive surface area evolution during dissolution and bubbling at the surface of the solid [34][35][36][37][53][54][55][56].…”

Section: Mechanism Of the Attack Of The Solid By Nitric Acidmentioning

confidence: 99%

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A method for phenomenological and chemical kinetics study of autocatalytic reactive dissolution by optical microscopy. The case of uranium dioxide dissolution in nitric acid media

Marc¹,

Magnaldo²,

Godard³

et al. 2018

EPJ Nuclear Sci. Technol.

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Abstract. Dissolution is a milestone of the head-end of hydrometallurgical processes, as the stabilization rates of the chemical elements determine the process performance and hold-up. This study aims at better understanding the chemical and physico-chemical phenomena of uranium dioxide dissolution reactions in nitric acid media in the Purex process, which separates the reusable materials and the final wastes of the spent nuclear fuels. It has been documented that the attack of sintering-manufactured uranium dioxide solids occurs through preferential attack sites, which leads to the development of cracks in the solids. Optical microscopy observations show that in some cases, the development of these cracks leads to the solid cleavage. It is shown here that the dissolution of the detached fragments is much slower than the process of the complete cleavage of the solid, and occurs with no disturbing phenomena, like gas bubbling. This fact has motivated the measurement of dissolution kinetics using optical microscopy and image processing. By further discriminating between external resistance and chemical reaction, the "true" chemical kinetics of the reaction have been measured, and the highly autocatalytic nature of the reaction confirmed. Based on these results, the constants of the chemical reactions kinetic laws have also been evaluated.

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Section: Measurement Of Dissolution Kinetics By Optical Microscopy Obmentioning

confidence: 99%

Section: Mechanism Of the Attack Of The Solid By Nitric Acidmentioning

confidence: 99%

A method for phenomenological and chemical kinetics study of autocatalytic reactive dissolution by optical microscopy. The case of uranium dioxide dissolution in nitric acid media

Marc¹,

Magnaldo²,

Godard³

et al. 2018

EPJ Nuclear Sci. Technol.

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show abstract

“…The rate-limiting step of the zinc dissolution was obtained from a comparison between experimental data and some kinetic models reported in the literature [34], as shown in Table 10. Figure 3 shows the leaching fraction (X) as a function of time for experiments shown in Table 9.…”

Section: Kinetic Analysismentioning

confidence: 99%

Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis

et al. 2020

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The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3+, O2, O3, and Fe2+ (which is continuously oxidized in the leaching solution by H2O2 and O2). The highest percentage of zinc extraction (96%) was obtained in pilot-scale experiments using H2SO4, Fe2+, and O2. Experimental results were compared with those of other researchers to provide a better understanding of the factors influencing the dissolution of zinc. In the first instance, it was determined from analysis of variance that leaching time and the use of an oxidant agent (O2 or O3) were the most influential factors during the direct leaching of zinc from the sphalerite concentrate. Kinetic models were also evaluated to determine the rate-limiting step of the sphalerite leaching; it was concluded that the type of the sulfur layer formed in the residue (porous or non-porous) depends on the type of the oxidant used in the leaching media, which determines the dissolution kinetics of zinc.

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“…Undoubtedly, there are innumerable differences in the details of solid and liquid reaction mechanisms. However, the mechanisms tend to fall into the common classes or systems that in the first approximation represent the limits of empirical discriminatory capacity 41 . The cohesive forces, freedom of movement and kinetic energy of liquid agreeted energy between a solid and a liquid are specially factors for growing the various 3Dnanostructures such as trigonal prisms, octahedra, tetrahedra and archimedean antiprisms with whole structures.…”

Section: Solid-liquid Reactionsmentioning

confidence: 99%

eview on the general technical approaches as an effective ways to fabricate inorganic nanomaterials

2020

JCBSC

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The chemical procurer is an exciting phenomenon, which involves pervasion of various reactions on dissimilar media. The synthesis practicability lets the assortment of materials nanoscale, including oxides, minerals, alloys, and sulfides...etc. Research on inorganic materials will fetch ameliorations to innovative techniques, such as the nanostructure, morphology associated technique and description conjugation artistry. To obtain optimized synthesis performance with the inorganic nanostructures, however, numerous challenges as yet stay. More research and additional effort is needed to address the following important issues to enhance the practical preparations of nanostructures for inorganic compounds. This paper provides an inclusive review of recent and current researches that focus on the general technical method ways for synthesizing inorganic materials in different nanoscales. The chemical growth of particles in a nanoscale can be quite different from those of large quantities of substances or atoms and the individual molecules that make up them. Obviously, there are continued efforts by a large group of chemists to prepare inorganic nanomaterials, and behaviors both known and desirable for chemicals are worth and choose the appropriate methods. In addition, in this paper, it can open the way to illustrate the choice of the appropriate method for many researches.

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Solid-liquid reaction kinetics – experimental aspects and model development

Cited by 33 publications

References 75 publications

A method for phenomenological and chemical kinetics study of autocatalytic reactive dissolution by optical microscopy. The case of uranium dioxide dissolution in nitric acid media

A method for phenomenological and chemical kinetics study of autocatalytic reactive dissolution by optical microscopy. The case of uranium dioxide dissolution in nitric acid media

Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis

eview on the general technical approaches as an effective ways to fabricate inorganic nanomaterials

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