A novel sodium carboxymethyl ellulose/aluminium citrate gel for extinguishing spontaneous fire in coal mines

Zhou, Changlin; Tang, Yibo

doi:10.1002/fam.2631

Cited by 20 publications

(6 citation statements)

References 23 publications

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“…The variation trends of the DSC and DTG curves for the coal sample were the same as those for the coal + LMP-Bt sample, but the amplitude of variation was small for the coal + LMP-Bt sample. Zhou et al [41] showed that after gel treatment, the weight loss rate of coal samples decreased and the released energy decreased. These results were consistent with the findings of the study.…”

Section: Inhibition Of Coal Combustionmentioning

confidence: 99%

Synthesis and Characteristics of a pH-Sensitive Sol-Gel Transition Colloid for Coal Fire Extinguishing

Wang

Zheng

et al. 2023

Gels

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Coal fires, most of which are triggered by the spontaneous combustion of coal, cause a huge waste of resources and release poisonous and harmful substances into the environment, seriously threatening the safety of industrial production. Gel flame retardant plays a core role in coal fire prevention and extinguishing. Most gel flame retardants used in coal fires possess good sealing and oxygen isolation properties, but it is difficult for them to flow deep into fire areas due to their low fluidity. Some fire extinguishing agents with good fluidity lack leak-blocking performance. In order to simultaneously improve the fluidity, leakage sealing, and oxygen isolation effects of coal fire extinguishing colloids, a novel, pH-sensitive, sol-gel transition colloid was prepared using low methoxyl pectin (LMP), calcium bentonite (Ca-Bt), sodium bentonite (Na-Bt), and water as the main components. When the initial sol-state colloid absorbed acid gas products from coal combustion, the pH value decreased and a large amount of Ca2+ in Ca-Bt precipitated, thus immediately growing calcium bridges with LMP molecules that formed a three-dimensional network structure for gelation. The optimum ratio of the new colloid was determined through X-ray diffraction, tube inversion, shock shear-temperature scanning, and genetic algorithm. By testing the fire extinguishing performance of the colloid, the findings proved that the product had good oxygen isolation performance, strong adhesion ability, high thermal stability, and strong inhibition effects on coal combustion.

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Section: Inhibition Of Coal Combustionmentioning

confidence: 99%

Synthesis and Characteristics of a pH-Sensitive Sol-Gel Transition Colloid for Coal Fire Extinguishing

Wang

Zheng

et al. 2023

Gels

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“…Zhou et al prepared an aluminum citrate fire-retardant gel with controllable gelation time and good stability using sodium carboxymethyl cellulose, cross-linking agent aluminum citrate, and pH modifier glucono-delta-lactone. 10 Dong et al developed a novel mining gel using sodium carboxymethyl cellulose as the polymer, zirconium citrate as the metal crosslinking agent, and glucono-delta-lactone as the pH modifier. 11 Zhang et al utilized acid and alkali coactivation to enhance the reactivity of fly ash and prepared activated fly ash gel by utilizing metal ions in the activated fly ash solution.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a New Type of Iron-Based Polymer Hydrogel for Mining and Its Firefighting Performance

Li,

Fan,

Yin

et al. 2024

ACS Omega

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To address the issue of coal self-ignition in mining areas, a water-based gel was developed using carboxymethyl cellulose sodium (CMC), ferric citrate, and glucono-delta-lactone as raw materials. The gel's gelation time was found to be controllable, and the system viscosity exhibited a threshold between 2.5 and 3% CMC content. Compared to water, the gel showed improved thermal stability by 26−31% for different formulations. The addition of the gel reduced CO emissions from coal by 31.3% within the temperature range of 80−220 °C, and it also decreased the reactivity of functional groups in coal molecules, resulting in a 1.7−37.7% increase in coal's activation energy. In simulated fire extinguishing experiments, the gel effectively adhered to the surface of the coal seam, forming an oxygen isolation film, and significantly enhanced the cooling and extinguishing effect compared to water.

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“…Vincent et al 12 developed a fire‐extinguishing gel with flame retardant and thermal insulation properties using sodium alginate as a matrix, which was gradually formed by sodium dodecyl sulfate as well as an ionic flocculant formed by the reaction of copper carbonate and glucose lactone. Zhou et al 13 prepared a sodium carboxymethyl cellulose/aluminum citrate gel for the prevention and extinguishing of mine fires. The gel showed strong compressive properties, good water retention, and high thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Carrageenan‐vermiculite‐dimethyl methyl phosphate ternary hybrid hydrogels for firefighting

et al. 2022

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An eco-friendly and bio-based ternary hybrid hydrogel consisting of carrageenan, vermiculite, and dimethyl methyl phosphate (DMMP) was prepared through a facile one-pot method. Rheological tests showed that this ternary hybrid hydrogel was a power-law fluid. The formulation of the ternary hybrid hydrogel was also screened, and the optimal formulation was found to be the ternary hybrid hydrogel containing 1 wt% carrageenan, 2 wt% DMMP, and 4 wt% vermiculite. Firefighting experiments showed that the ternary hybrid hydrogel could stop the chain reaction and rapidly reduce the temperature of combustion. Compared to water, the extinguishing time of the ternary hybrid hydrogel was shortened by 46.6%, and the volume consumed was reduced by 43.3%. The superior fire extinguishing efficiency of the ternary hybrid hydrogel could be attributed to the combined effect of each component: carrageenan provides viscosity, making the hydrogel firmly cover the burning surface; DMMP works as a free radical scavenger that can stop chain reactions; and vermiculite acts as a barrier layer, which helps to insulate air and heat and prevent resurgence. This work provides an environmentally-friendly, cost-effective, and bio-based hybrid hydrogel for firefighting.

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A novel sodium carboxymethyl ellulose/aluminium citrate gel for extinguishing spontaneous fire in coal mines

Cited by 20 publications

References 23 publications

Synthesis and Characteristics of a pH-Sensitive Sol-Gel Transition Colloid for Coal Fire Extinguishing

Synthesis and Characteristics of a pH-Sensitive Sol-Gel Transition Colloid for Coal Fire Extinguishing

Preparation of a New Type of Iron-Based Polymer Hydrogel for Mining and Its Firefighting Performance

Carrageenan‐vermiculite‐dimethyl methyl phosphate ternary hybrid hydrogels for firefighting

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