Study of resource utilization and fire prevention characteristics of a novel gel formulated from coal mine sludge (MS). (1st May 2020)

• Record Type: Journal Article
• Authors: Ren, Xiaofeng; Hu, Xiangming; Cheng, Weimin; Bian, Susu; Zhao, Yanyun; Wu, Mingyue; Xue, Di; Li, Yongsheng; Lu, Wei; Wang, Peng
• Is Part Of: Fuel. Volume 267(2020)
• Publication Date: 2020-05-01
• Subjects: Raman spectroscopy -- Chelation force between ions -- Cross-linking -- Inhibition -- Clean material; MS Coal mine sludge -- WG Sodium silicate -- HPAM partially hydrolyzed polyacrylamide -- PAFC Polyaluminium chloride -- CMC Sodium carboxymethyl cellulose -- AlCit Aluminum citrate -- GDL Glucono-δ-lactone -- FTIR spectroscopy Fourier transform infrared -- XRF X-ray fluorescence spectrometry -- SEM Scanning electron microscopy -- EDS Energy-dispersive X-ray spectroscopy -- TG-IR Thermogravimetry-infrared combination; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.117261
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Recycling coal mine sludge (MS) to prepare a novel gel. HPAM-Al 3+ /Fe 3+ gel in MS and introduced CMC Cross-link form a dense network structure. Injecting MS into goaf to avoid contamination of surface soil and drinking water. Abstract: In order to utilize coal mine sludge (MS) and reduce material cost, this paper reports the preparation method of a novel MS/CMC-Al 3+ fire prevention and extinguishing material by mixing MS with sodium carboxymethyl cellulose (CMC), polyaluminium chloride, and citric acid. The experimental results indicate that with MS: CMC: AlCit (aluminum citrate): H2 O = 15:1:4:35, MS/CMC-Al 3+ gel displayed the best compressive strength and inhibitory effect. The combination of Raman spectroscopy and FTIR spectroscopy showed that HPAM-Al 3+ /Fe 3+ gel in MS and CMC form a strong chelation force between ions. SEM analysis showed that the surface structure of MS/CMC-Al 3+ gel was extremely dense and MS, CMC, Al 3+, and Fe 3+ were evenly distributed in the composite colloid, suggesting that HPAM-Al 3+ /Fe 3+ gel and CMC were completely crosslinked. By analyzing the oxidation characteristics of MS/CMC-Al 3+ gel via TG-IR, it was found that MS/CMC-Al 3+ gel can effectively inhibit the increase in coal temperature and heat accumulation, which is beneficial for spontaneous combustion process of coal. Simultaneously, MS/CMC-Al 3+ gel can also inhibit the generation of CO and CO2 from combustion, which plays a significant inhibitory role. MS/CMC-Al 3+ gel reduces pollution and cost by the recycling of wastes; hence, it is a clean fire protection and extinguishing material.