Utilization of Copper Flotation Tailings in Geopolymer Materials Based on Zeolite and Fly Ash

Materials, Journal Year: 2024, Volume and Issue: 17(24), P. 6115 - 6115

Published: Dec. 14, 2024

Copper flotation tailings (FTs), resulting from the separation and beneficiation processes of ores, are a significant source environmental pollution (acid mine drainage, toxic elements leaching, dust generation). The most common disposal method for this industrial waste is dumping. However, due to their favorable physical chemical properties—the high content aluminosilicate minerals (60–90%)—flotation can be effectively treated reused through geopolymerization technology, thereby adding value waste. objective study was evaluate potential utilizing FTs produce sustainable materials. Geopolymers based on natural zeolite (NZ), sodium-modified (NaZ), fly ash (FA) were prepared using 20%, 35%, 50% FTs, activated with 10 M NaOH solution. investigated influence Ca/Si, Si/Al, Na/Al molar ratios structural, thermal, mechanical properties (XRD, TG/DTG unconfined compressive strength, UCS), contaminant immobilization (TCLP method) geopolymers. Geochemical modeling via PHREEQC program employed interpret results. findings indicated that UCS decreased in zeolite-based geopolymers as FT increased inertness low calcium system (Ca/Si ≤ 0.3), contrast FA-based geopolymer. highest 44.3 MPa recorded an geopolymer containing tailings, optimal 0.4 3.0 1.1 Na/Al. In conclusion, process has been determined suitable technological approach treatment reuse FTs.

Language: Английский

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Minerals, Journal Year: 2024, Volume and Issue: 14(5), P. 487 - 487

Published: May 3, 2024

Coal gangue, the primary solid waste generated during coal mining process, is typically disposed of on surface, where it gradually accumulates to form gangue piles that significantly contaminate surrounding environment. Filling technology has been widely employed for safe and efficient disposal due its sustainability, safety, efficiency. However, there still a lack theoretical research concentration slurry in long-distance filling pipeline transportation. Therefore, calculation model ultra-long-distance transportable with different grades was constructed based static anti-segregation performance Bingham model. In addition, relevant parameters this mine were determined using 8 km transport one as technical background. It subsequently demonstrated yield stress, plastic viscosity, mass various exhibit an increasing exponential function, while density linear actual flow rate correspond quadratic polynomial increment. Finally, minimum maximum concentrations can be transported over long distances determined. This work provides practical guidance how select transport.

Language: Английский

Effect of sintering temperature on the properties of ceramic binders synthesized from coal gangue-based geopolymer

International Journal of Coal Preparation and Utilization, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 16

Published: Nov. 6, 2024

As a by-product of the coal industry, effective use gangue presents significant implications for environmental protection and sustainable development upon utilization. Given rich content silicon aluminum in gangue, this study converts it into precursor ceramic binders used grinding wheels through geopolymerization reaction process. Ceramic SiO2-B2O3-Al2O3-RO-R2O system were prepared at sintering temperatures ranging from 590 to 740°C, performance each sample was tested. The research found that flexural strength binder reached peak 31 MPa when sintered 690°C. Additionally, hardness observed be highest temperature 640°C, reaching 211.8 hV. It as rose, wettability tended decrease. Using techniques including XRD, SEM, EDS, effect on microstructure phase transformation material analyzed, these changes determined properties material. This not only confirmed potential value abrasive tools industry but also opened up new strategies technical solutions field solid waste resource

Language: Английский