Granular Thermodynamic Migration Model Suitable for High‐Alkalinity Red Mud Filtrates and Test Verification

ABSTRACT A theoretical model of the migration process of high‐alkalinity red mud particles in porous media was derived from granular thermodynamics, complying with the complementary motion process of two‐phase flows (i.e., hydroxide ions and red mud powder). From the perspective of energy dissipatio...

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Vydáno v:International journal for numerical and analytical methods in geomechanics Ročník 49; číslo 5; s. 1530 - 1543
Hlavní autoři: Bai, Bing, Wu, Haiyan, Nie, Qingke, Liu, Jingjing, Jia, Xiangxin
Médium: Journal Article
Jazyk:angličtina
Vydáno: Bognor Regis Wiley Subscription Services, Inc 01.04.2025
Témata:
Alkalinity
Energy dissipation
Energy exchange
Filtrate
granular thermodynamics
Hydroxides
Injection
Ions
migration
Mud
Particle injection
Porous media
Red mud
red mud particle
seepage
Spatial variations
suspended powder
Thermodynamics
ISSN:0363-9061, 1096-9853
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Shrnutí:ABSTRACT A theoretical model of the migration process of high‐alkalinity red mud particles in porous media was derived from granular thermodynamics, complying with the complementary motion process of two‐phase flows (i.e., hydroxide ions and red mud powder). From the perspective of energy dissipation provoked by particle migration and molecular thermal motion, a migration model of hydroxide ions and suspended particles under mixed conditions was established. This model naturally considers the complex adsorption/desorption process between hydroxide ions (or red mud particles) and a porous medium solid matrix, as well as between hydroxide ions and red mud particles. Moreover, the model reveals the dynamic process and deposition effect of suspended powder under multiphase interactions during temporal and spatial variations. The migration progression of suspended substances in the process of transient injection of red mud filtrate with different pH values and the continuous change in red mud particle injection were verified by experiments.
Bibliografie:This research was supported by the National Natural Science Foundation of China (52378321; 52079003).
Funding
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content type line 14
ISSN:0363-9061
1096-9853
DOI:10.1002/nag.3946