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Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP

In order to improve the effect of microbial-induced calcium carbonate precipitation (MICP) in tailings reinforcement, sodium citrate, an organic matrix with good water solubility, was selected as the crystal form adjustment template for inducing calcium carbonate crystallization, and the reinforceme...

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Autores principales: Hu, Lin, Zheng, Huaimiao, Wu, Lingling, Zhang, Zhijun, Yu, Qing, Tian, Yakun, He, Guicheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10420210/
https://www.ncbi.nlm.nih.gov/pubmed/37570041
http://dx.doi.org/10.3390/ma16155337
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author Hu, Lin
Zheng, Huaimiao
Wu, Lingling
Zhang, Zhijun
Yu, Qing
Tian, Yakun
He, Guicheng
author_facet Hu, Lin
Zheng, Huaimiao
Wu, Lingling
Zhang, Zhijun
Yu, Qing
Tian, Yakun
He, Guicheng
author_sort Hu, Lin
collection PubMed
description In order to improve the effect of microbial-induced calcium carbonate precipitation (MICP) in tailings reinforcement, sodium citrate, an organic matrix with good water solubility, was selected as the crystal form adjustment template for inducing calcium carbonate crystallization, and the reinforcements of tailings by MICP were conducted in several experiments. The effects of sodium citrate on the yield, crystal form, crystal appearance, and distribution of calcium carbonate were analyzed by MICP solution test; thus, the related results were obtained. These showed that the addition of a proper amount of organic matrix sodium citrate could result in an increment in the yield of calcium carbonate. The growth rate of calcium carbonate reached 22.6% under the optimum amount of sodium citrate, and the crystals of calcium carbonate were diverse and closely arranged. Based on this, the MICP reinforcement test of tailings was carried out under the action of the optimum amount of sodium citrate. The microscopic analysis using CT and other means showed that the calcium carbonate is distributed more uniformly in tailings, and the porosity of samples is significantly reduced by layered scanning analysis. The results of triaxial shear tests showed that adding organic matrix sodium citrate effectively increased the cohesion, internal friction angle, and peak stress of the reinforced tailings. It aims to provide a novel idea, a creative approach, and a method to enhance the reinforcement effect of tailings and green solidification technology in the mining environment.
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spelling pubmed-104202102023-08-12 Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP Hu, Lin Zheng, Huaimiao Wu, Lingling Zhang, Zhijun Yu, Qing Tian, Yakun He, Guicheng Materials (Basel) Article In order to improve the effect of microbial-induced calcium carbonate precipitation (MICP) in tailings reinforcement, sodium citrate, an organic matrix with good water solubility, was selected as the crystal form adjustment template for inducing calcium carbonate crystallization, and the reinforcements of tailings by MICP were conducted in several experiments. The effects of sodium citrate on the yield, crystal form, crystal appearance, and distribution of calcium carbonate were analyzed by MICP solution test; thus, the related results were obtained. These showed that the addition of a proper amount of organic matrix sodium citrate could result in an increment in the yield of calcium carbonate. The growth rate of calcium carbonate reached 22.6% under the optimum amount of sodium citrate, and the crystals of calcium carbonate were diverse and closely arranged. Based on this, the MICP reinforcement test of tailings was carried out under the action of the optimum amount of sodium citrate. The microscopic analysis using CT and other means showed that the calcium carbonate is distributed more uniformly in tailings, and the porosity of samples is significantly reduced by layered scanning analysis. The results of triaxial shear tests showed that adding organic matrix sodium citrate effectively increased the cohesion, internal friction angle, and peak stress of the reinforced tailings. It aims to provide a novel idea, a creative approach, and a method to enhance the reinforcement effect of tailings and green solidification technology in the mining environment. MDPI 2023-07-29 /pmc/articles/PMC10420210/ /pubmed/37570041 http://dx.doi.org/10.3390/ma16155337 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hu, Lin
Zheng, Huaimiao
Wu, Lingling
Zhang, Zhijun
Yu, Qing
Tian, Yakun
He, Guicheng
Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP
title Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP
title_full Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP
title_fullStr Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP
title_full_unstemmed Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP
title_short Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP
title_sort experimental study on the effect of an organic matrix on improving the strength of tailings strengthened by micp
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10420210/
https://www.ncbi.nlm.nih.gov/pubmed/37570041
http://dx.doi.org/10.3390/ma16155337
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