Thermochemical purification of talc with ammonium sulphate as chemical additive

Castleman, Barbara A.; Merwe, Elizabet M. van der; Doucet, Frédéric J.

doi:10.1016/j.mineng.2021.106815

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…After dropping, we raised the total temperature to 110 • C. A large amount of (NH 4 ) 2 SO 4 will be formed in the reaction. To further explore PSS + (NH 4 ) 2 SO 4 thermal safety performance, we measured it with an advanced calorimeter and fitted its E a with the thermokinetic model [10].…”

Section: Sulfonation Synthesis Of Pssmentioning

confidence: 99%

“…The DSC developed by Mettler Toledo (Mettler Toledo Co., Zurich, Switzerland) was used to measure the heat release of PSS + (NH 4 ) 2 SO 4 produced in the sulfonation synthesis experiment under different β [11][12][13]. According to the physical and chemical properties of PSS + (NH 4 ) 2 SO 4 , the high-density alumina crucible was selected to conduct the experience, evenly spread 5.75 ± 0.06 mg of PSS + (NH 4 ) 2 SO 4 in an identical alumina crucible, and calorimetric experiments with different β were carried out [10]. Combined with the suggestions of the International Federation Of Thermal Analysis And Calorimetric Algorithms and the actual situation of DSC, we calculated five groups of experiments, set to 1.0, 2.0, 3.0, 5.0, and 8.0 • C/min, respectively [14][15][16].…”

Section: Differential Scanning Calorimetry Experimentsmentioning

confidence: 99%

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Thermal Stability Determination of Propylene Glycol Sodium Alginate and Ammonium Sulfate with Calorimetry Technology

Yao

Liu

et al. 2022

Processes

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Propylene Glycol Alginate Sodium Sulfate (PSS) is widely produced and used in medicine as a marine drug for treating hyperlipidemia. During the sulfonation synthesis of PSS, the sulfonation of chlorosulfonic acid is exothermic. At high temperatures, the process can easily produce a large amount of ammonium sulfate. Ammonium sulfate adheres to PSS in crystal and participates in the sulfonation reaction. In this study, the sulfonation process of commercial PSS was reproduced in the laboratory using chlorosulfonic acid and formamide. We used differential scanning calorimetry and thermogravimetric analyzer to examine the thermal stability of PSS, and we used both differential and integral conversional methods to determine the appropriate thermokinetic models for this substance. We also established an autocatalytic model to study the conversion limit time and the maximum rate time of this substance. After calculation, the activation energy of this substance is no more than 60 kJ/mol, and it has other exothermic performances at different heating rates. The results help to optimize the sulfonation process of PSS and analyze the thermal risk of PSS with ammonium sulfate.

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Section: Sulfonation Synthesis Of Pssmentioning

confidence: 99%

Section: Differential Scanning Calorimetry Experimentsmentioning

confidence: 99%

Thermal Stability Determination of Propylene Glycol Sodium Alginate and Ammonium Sulfate with Calorimetry Technology

Yao

Liu

et al. 2022

Processes

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“…The layered natural talc can delay the entry of corrosive media from the environment and prolong the lifespan of the coating. [29][30][31][32] Biochar, a material naturally high in carbon, with strong adsorption capacity, and multifunctional oxygen-containing functional groups, [33] can also develop a lamellar structure after being subjected to ultrasonic or other experimental treatments. [34] Therefore, it is speculated that the addition of biochar to epoxy could provide a certain degree of insulation against corrosive media.…”

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confidence: 99%

Enhancement of barrier and corrosion protection performance of epoxy coatings through adding eco‐friendly lamellar biochar

Zhang

Wang

et al. 2022

Materials & Corrosion

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Biomass, as a green and renewable energy source, can be procured from a broad range of sources and is low in cost. The full exploitation of biomass could reduce the dependence on and consumption of fossil fuels, and is conducive to the protection of the environment. The prevention of corrosion of metals is an issue considered problematic in many fields, including in industrial production among others. Many anticorrosion materials are expensive and are noxious to the environment. This is an important issue that anticorrosion workers cannot ignore. This study proposes the use of biochar epoxy to boost the barrier properties of the coating, which is both economical and eco‐friendly. The incorporation of biochar can reduce the porosity of the coating and complicate the path of the corrosive media towards the steel substrate. Additionally, it can also reinforce the anticorrosion performance of the coatings. First, this article introduces the effect of biochars with different ultrasonic durations on the anticorrosion performance of anticorrosion coatings. After finding the biochar with the optimal ultrasonic duration, the effects of biochar on the anticorrosion performance of the coatings at different temperatures are assessed and the changes in its anticorrosion performance following soaking are discussed. The discussion concludes that applying biochar to anticorrosion coatings provides a feasible type of coating for anticorrosion work.

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Whitening and purification of calcined talc powders from black talc by the milling and reactive calcination with magnesium precursors

Wang,

Lu,

Xie

et al. 2023

J Therm Anal Calorim

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Thermochemical purification of talc with ammonium sulphate as chemical additive

Cited by 5 publications

References 27 publications

Thermal Stability Determination of Propylene Glycol Sodium Alginate and Ammonium Sulfate with Calorimetry Technology

Thermal Stability Determination of Propylene Glycol Sodium Alginate and Ammonium Sulfate with Calorimetry Technology

Enhancement of barrier and corrosion protection performance of epoxy coatings through adding eco‐friendly lamellar biochar

Whitening and purification of calcined talc powders from black talc by the milling and reactive calcination with magnesium precursors

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