Analysis of Influencing Factors in the Preparation of Mullite Whiskers from Recovering Silicon-Rich Waste under Low-Temperature Conditions

Gu, Xiaohua; Chen, Pei-Quan; Wang, Tong; Liu, Siwen; Zhu, Shangwen; Zhu, Yi; Liu, Yan

doi:10.3390/nano13071143

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…However, there are relatively few studies on catalysts in the chemical degradation of waste polyurethane degradation, especially with respect to alcoholysis. Moreover, for traditional alkali metal catalysts, catalytic degradation efficiency is low; as such, it is important to research and develop new efficient catalysts for the degradation of waste polyurethane [ 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influencing Factors of the Efficient Degradation of Waste Polyurethane and Its Scheme Optimization

2023

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This work proposes an efficient catalytic recovery and utilization method for waste polyurethane foam. This method uses ethylene glycol (EG) and propylene glycol (PPG) as two-component alcohololytic agents for the alcoholysis of waste polyurethane foams. For the preparation of recycled polyethers, the conditions of different catalytic degradation systems were catalyzed by duplex metal catalysts (DMC) and alkali metal catalysts, and a synergy with both was also used. The experimental method was adopted with the blank control group and was set up for comparative analysis. The effect of the catalysts on the recycling of waste polyurethane foam was investigated. The catalytic degradation of DMC and the alkali metal catalysts alone, as well as the synergistic effect of the two catalysts, was explored. The findings revealed that the NaOH and DMC synergistic catalytic system was the best, and that the system activity was high under a two-component catalyst synergistic degradation. When the amount of NaOH added in the degradation system was 0.25%, the amount of DMC added was 0.04%, the reaction time was 2.5 h, and the reaction temperature was 160 °C, the waste polyurethane foam was completely alcoholized, and the prepared regenerated polyurethane foam had high compressive strength and good thermal stability. The efficient catalytic recycling method of waste polyurethane foam proposed in this paper has certain guiding and reference values for the practical production of solid-waste-recycled polyurethane.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Influencing Factors of the Efficient Degradation of Waste Polyurethane and Its Scheme Optimization

2023

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“…Rashad et al [41] prepared mullite whiskers by utilizing the catalytic effects of AlF 3 in a reaction environment at 1100 • C. Wang et al [42] grew mullite whiskers using Al 2 (SO 4 ) 3 -Na 2 SO 4 as a molten salt system at 1023 • C. Chen et al [43] and Abdullayev et al [44] further reduced the preparation temperature to below 900 • C by adding aluminum fluoride. At the same time, there are also many scholars [45] focusing on the influencing factors of mullite whisker growth, but they do not take into account the most important factors of the molten salt system, the rate of temperature rise, or the heating time as regards their effects on the structure of mullite, and studies have yet to be undertaken on the effects of mullite whiskers on ceramic toughness.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Affecting the Preparation of Mullite Whiskers from Silica-Rich Slag and Application Studies

Zhu,

Gu,

Liu

et al. 2023

Materials

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This paper presents an in-depth comparative study of the effects of different molten salt systems, catalyst additions, preparation temperatures, temperature rise rates, and holding times on the properties of mullite whiskers during their preparation process, as well as exploring the enhancement of the toughening effect of mullite whiskers on ceramics. The morphology, crystal structure, and composition of the whiskers were analyzed via SEM, XRD, TG, strength tests, etc. The results show that the best-performing mullite whisker was prepared with an aluminum sulfate molten salt system, with the addition of aluminum fluoride catalyst at 4%, a temperature increase rate of 5 °C, a temperature increase up to 850 °C, and a holding time of 5 h, and its aspect ratio reached 20.64. By adding different contents of mullite whiskers and comparing the toughness strengths and wear rates of the silicon carbide ceramics, it was found that the toughness strength of the ceramics was improved by more than 16.5% and the wear rate was lower than 0.4% when the addition of mullite whisker was more than 3%.

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Multifunctional mullite fiber reinforced SiBCN ceramic aerogel with excellent microwave absorption and thermal insulation performance

Zhang,

Yang,

Han

et al. 2024

Ceramics International

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Analysis of Influencing Factors in the Preparation of Mullite Whiskers from Recovering Silicon-Rich Waste under Low-Temperature Conditions

Cited by 4 publications

References 47 publications

Analysis of the Influencing Factors of the Efficient Degradation of Waste Polyurethane and Its Scheme Optimization

Analysis of the Influencing Factors of the Efficient Degradation of Waste Polyurethane and Its Scheme Optimization

Analysis of Factors Affecting the Preparation of Mullite Whiskers from Silica-Rich Slag and Application Studies

Multifunctional mullite fiber reinforced SiBCN ceramic aerogel with excellent microwave absorption and thermal insulation performance

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