Leaching kinetics on the removal of phosphorus from waste phosphogypsum by application of shrinking core model

Mashifana, Tebogo; Ntuli, Freeman; Okonta, Felix

doi:10.1016/j.sajce.2018.11.001

Cited by 18 publications

(19 citation statements)

References 14 publications

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“…Letting X m = 0, 0.1, 0.2 and 0.3, different diagrams were fitted using Equations (1, 2). In addition to film diffusion and the chemical reaction equations based on the crackling core model, we also employed the Stokes regime (Equation 3) (Gomes et al, 2018) which considers liquid boundary layer diffusion, as well as a recently proposed model (Equation 4) based on interface transfer and diffusion across the product layer (Mashifana et al, 2019).…”

Section: Study Of the Kinetic Controlsmentioning

confidence: 99%

A Systems-Based Approach for Cyanide Overproduction by Bacillus megaterium for Gold Bioleaching Enhancement

Aminian-Dehkordi

Mousavi

Marashi

et al. 2020

Front. Bioeng. Biotechnol.

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Section: Study Of the Kinetic Controlsmentioning

confidence: 99%

A Systems-Based Approach for Cyanide Overproduction by Bacillus megaterium for Gold Bioleaching Enhancement

Aminian-Dehkordi

Mousavi

Marashi

et al. 2020

Front. Bioeng. Biotechnol.

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“…The analysis of variance (ANOVA) was applied to investigate the significance of difference in the investigated variables. A statistical significance confidence level limit of 95% was used for the tests [32]. F value and critical F value were utilized to evaluate the significance in varying the variables investigated.…”

Section: Characterizationmentioning

confidence: 99%

“…F value and critical F value were utilized to evaluate the significance in varying the variables investigated. F value can be defined as a ratio of two variances, measuring how far the data are scattered from the mean or the dispersion [32]. It is calculated as shown in Eq.…”

Section: Characterizationmentioning

confidence: 99%

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Recovery of Silicon Dioxide from Waste Foundry Sand and Alkaline Activation of Desilicated Foundry Sand

Mashifana

Sithole

2020

J. Sustain. Metall.

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This study was conducted to recover silica (desilication) as a valuable metalloid from waste foundry sand (WFS) by a leaching process and to find application for desilicated foundry sand (DFS). The leaching time applied was 5 h; 3 M of potassium hydroxide (KOH) was used as a leaching reagent. The agitation speed of 200 rpm and the liquid/solid ratio of 25 were found to be the best conditions for optimum leaching results. A geopolymer from DFS was developed by using NaOH as an alkaline activator. The results obtained showed that the optimum conditions for the synthesis of a geopolymer were 15 M NaOH, 150 µm DFS particle size, and a curing temperature of 80 ℃ for 72 h. The geopolymer strength development was due to the formation of Phillipsite and Kalsilite as new hydration products. At the optimum alkaline solution concentration, the highest unconfined compressive strength (UCS) of 4.8 MPa was achieved. The developed geopolymer met the minimum strength requirements for load bearing material. This study provides an innovative and novel solution for the beneficiation of spent foundry sand and the recovery of a valuable metalloid, resulting to zero waste generation. Graphical Abstract

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“…Some authors study the way to reuse phosphogypsum as raw material (Mashifana, Ntuli, & Okonta, 2018;Romero-Hermida et al, 2018).…”

Section: Thesis: State Of the Art And Methodologymentioning

confidence: 99%

Characterising an ancient storage area of phosphogypsum by combining geophysical, geochemical and statistical techniques

Vásconez-Maza¹,

David²

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Therefore, it was performed principal component analysis and partial least squares discriminant analysis to classify and discriminating both populations. Consequently, the research has successfully achieved the objectives. Results showed that combining electrical resistivity tomography with chemical analysis is suitable and reliable to characterise waste deposits. Additionally, incorporating statistic tools have demonstrated satisfactory results and support the obtained results mathematically. Finally, this thesis is structured in chapters as follows: chapter one presents the objectives, chapter two analyse state of the art. Later, chapters three, four, and five holds the scientific publications that compose this thesis. Finally, chapter six deals with the conclusions of this doctoral thesis.

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Leaching kinetics on the removal of phosphorus from waste phosphogypsum by application of shrinking core model

Cited by 18 publications

References 14 publications

A Systems-Based Approach for Cyanide Overproduction by Bacillus megaterium for Gold Bioleaching Enhancement

A Systems-Based Approach for Cyanide Overproduction by Bacillus megaterium for Gold Bioleaching Enhancement

Recovery of Silicon Dioxide from Waste Foundry Sand and Alkaline Activation of Desilicated Foundry Sand

Characterising an ancient storage area of phosphogypsum by combining geophysical, geochemical and statistical techniques

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