Synthesis and characterization of geopolymer composites based on gasification coal fly ash and steel slag

Chen, Yuchi; Zhou, Xian; Wan, Sha; Zheng, Rui; Tao, Jun; Hou, Haobo; Wang, Teng

doi:10.1016/j.conbuildmat.2019.03.292

Cited by 78 publications

(23 citation statements)

References 36 publications

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“…Most of the studies published so far in this field focus on the use of inorganic-based wastes as immobilisation agents (Chen et al, 2019b; Moukannaa et al, 2019; Novais et al, 2019). However, inorganic binders seem to be inefficient to avoid the release of DOC and total dissolved solids (TDS) in water (Du et al, 2018; Korotenko et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Non-conventional stabilisation/solidification treatment of industrial wastes with residual powdered paints

Vaccari

Castro

2019

Waste Manag Res

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Stabilisation/solidification technologies are widely used for rendering industrial wastes inert. In this study, residual powdered paints were applied to treat different types of industrial wastes by stabilisation/solidification: Fumes from steel-making process, sludge from coagulation/flocculation treatments and powders from brushing and polishing metallic objects. Stabilisation/solidification trials were performed both under static conditions and in motion. It was observed that the residual paints could polymerise well in 60 min at 120 °C. The addition of water during the treatment resulted in highly porous and friable materials and, therefore, is not recommended. The mixture between wastes and paint influenced polymerisation. Specific heating conditions needed to be tested for each waste, varying from 80 °C to 150 °C. Significant reduction on leachability after treatment could be reached in most cases. Reduction on chlorides release up to 92.0% were achieved. Contents of other elements on the leachates, such as copper, molybdenum, nickel, zinc and dissolved organic carbon, could also be reduced in percentages up to 96.9%, 97.6%, 98.8%, 95.7% and 96.9%, respectively. For some types of wastes, however, especially those containing high contents of copper and mineral oils, the treatment was ineffective. Polymerisation in motion apparently improved binding capacity, but tests with increased content of paints are recommended to reduce the release of dissolved organic carbon.

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Section: Introductionmentioning

confidence: 99%

Non-conventional stabilisation/solidification treatment of industrial wastes with residual powdered paints

Vaccari

Castro

2019

Waste Manag Res

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“…The concentration of phenol was determined by 4aminoantipyrine spectrophotometry at a maximum absorption wavelength of 510 nm using a T9 series double beam UV-Vis spectrophotometer (Beijing PURKINJE General Instrument Co., Ltd.). The effects of the initial concentrations of phenol (10-300 mg L À1 ), amount of sorbent (0.01-0.3 g), and initial pH (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) of the solution on the adsorption performance were investigated, respectively.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…38 Therefore, adsorption isotherm studies were carried out under optimum adsorption conditions. Currently, the most commonly used adsorption isotherm models are the Langmuir isotherm model (eqn (5)) and the Freundlich isotherm model (eqn ( 6)), and so these two models were used to t the adsorption process.…”

Section: Adsorption Isotherms Analysismentioning

confidence: 99%

“…Research in recent years has shown that CGFS has good physical and chemical properties and has good promise for application in many fields. Chen et al 5 synthesized geopolymer composites based on coal gasification fly ash, and the prepared composites could be used as construction materials in civil engineering. Dai et al 6 explored the combustibility of high carbon CGFS and found that the combustion property of CGFS was consistent with high ash coal and was suitable for pressurized furnace combustion.…”

Section: Introductionmentioning

confidence: 99%

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Low-cost Y-type zeolite/carbon porous composite from coal gasification fine slag and its application in the phenol removal from wastewater: fabrication, characterization, equilibrium, and kinetic studies

Chai

Bai

et al. 2022

RSC Adv.

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“…Previous researches show that, in addition to their low energy consumption, AAMs also have some properties superior to Portland cement (PC), making it more suited for use in the repairing work (Gomaa et al, 2020;Zhang et al, 2020), nuclear waste immobilisation (Gijbels et al, 2018), high-temperature exposure (Çelikten et al, 2019) and multifunctional materials (Tang et al, 2019). Preliminary work carried out by Chen et al (2019) proved that CGR can be blended with steel slag and incorporated into AAMs owing to its amorphous content. On the other hand, several researches on developing AAMs using seawater as mixing water have reported that the ions (Ca 2+ , Cl -, SO4 2-, CO3 2-, et al) in seawater could significantly contribute to the alkali-activation process (Ines et al, 2010;Rashad et al, 2013;Shi et al, 2019).…”

Section: Coal Chemical Wastewater(ccw)mentioning

confidence: 99%

Combined effect of coal chemical wastewater and PC on preparing of coal-to-liquids residue-based alkali activated materials

Zhu

et al. 2021

Journal of Hazardous Materials

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Aimed to achieve "waste control by waste" of coal-to-liquids (CTL) industry, coal gasification residue (CGR), the most typical CTL residue, and coal chemical wastewater (CCW) were used as aluminosilicate precursor and auxiliary activator respectively to prepare alkali activated materials (AAMs). CGR-based AAMs using a less concentrated NaOH solution than conventional, with CCW as mixing water were synthesized. The results showed that CCW benefited the compressive strength of CGR-based AAMs significantly, but demonstrating slight reduction over time. The combined effect of CCW and Portland cement (PC) supplied continuous increase of strength and eliminated the strength reduction with age. The mechanisms behind the improved performance of the AAMs due to the introduction of CCW and PC were discussed by XRD, FTIR, TG-DSC, MIP and ESEM. It was found that the increased alkali content due to the introduction of the CCW, supplied more extensive dissolution of active aluminosilicate and progressive geopolymerization of CGR. The coexistence of both N-A-S-H gel and C-A-S-H gel (originated from the introduced PC) in hardened AAM pastes reduced the proportion of pores larger than 100 nm to less than 30%, and provided denser structure.

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Synthesis and characterization of geopolymer composites based on gasification coal fly ash and steel slag

Cited by 78 publications

References 36 publications

Non-conventional stabilisation/solidification treatment of industrial wastes with residual powdered paints

Non-conventional stabilisation/solidification treatment of industrial wastes with residual powdered paints

Low-cost Y-type zeolite/carbon porous composite from coal gasification fine slag and its application in the phenol removal from wastewater: fabrication, characterization, equilibrium, and kinetic studies

Combined effect of coal chemical wastewater and PC on preparing of coal-to-liquids residue-based alkali activated materials

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