Investigação fototérmica de argila vermelha: medidas de propriedades térmicas e estruturais

Natural clay is a perspective material for application as sorbents for wastewater treatment as well as for sorption of radionuclides, where the properties of the clays can be changed under influence of ionizing radiation. For application of Latvian illite/kaolinite clays for isotope sorption it is important to characterize the physic-chemical properties of pre-prepared air dried clays. Two fractions of the illite clays were selected. A fraction with grain size 100 μm (SiO2 content 60.9 ± 1.5 wt.%, specific surface area 35 m2/g) and a sand free fraction – 2 μm (SiO2 47.7 ± 1.9 wt.%, specific surface area 38 m2/g). Selected fractions were irradiated with accelerated electrons (5 MeV, ELU-4, Salaspils, absorbed dose up to 500 kGy). Non-irradiated and irradiated clays were analysed with means of Fourier transform infrared (FT-IR) spectrometry.

show abstract

“…100 μm fraction no exact correlation between absorbed dose and free radicals occur. [17,18] (Fig. 6 and Fig.…”

Section: Fig 2 Thermogravimetry Differential Thermogravimetry Of Tmentioning

confidence: 98%

Investigations of Latvian Illite/Kaolinite Clays Irradiated Under Action of Accelerated Electrons

Conka

Avotiņa

Švinka

et al. 2019

View full text Add to dashboard Cite

show abstract

Second law assessment of a Hoffmann kiln for the red ceramics industry

Carvalho

Silva

2018

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

This study presents the results of a thermodynamic analysis carried out for a Hoffmann kiln installed in a red ceramics industry in Northeast Brazil. From the case study, it was evident that the red ceramics industry has not advanced significantly in the last decades or made any significant improvements in the manufacturing progresses. Exergy analysis revealed a high rate of exergy destruction; 99.46% of the firewood exergy was being destroyed through mixing of different chemical components and heat exchange among substances at different temperatures or due to heat transfer to the environment. A large amount of infiltrated air was revealed by the mass balance, which contributed to the low exergy efficiency. Negative effects on fuel consumption and lower temperatures of combustion air are also consequences of infiltration of cold air. Energy and exergy performance improvements are achievable through excess air elimination and exhaust preheating. On a monthly basis, elimination of infiltrated air could save approximately 27.6 m 3 of firewood, while the use of chimney gases to preheat the bricks could save 28.9 m 3 of firewood. Keywords Hoffmann kiln • Red ceramics • Exergy analysis • Energy analysis List of symbols c Specific heat (kJ kg −1 K −1) ex Specific exergy (kJ kg −1) Ex Exergy rate (kW) h Specific enthalpy (kJ kg −1) I Irreversibility rate (kW) M Mass flow (kg s −1) P Pressure (kPa) Q Heat (kW) s Specific entropy (kJ kg −1 K −1) T Temperature (K) V Velocity (m s −1) Greek γ Activity coefficient φ Chemical exergy correction factor ƞ Efficiency

show abstract

Investigação fototérmica de argila vermelha: medidas de propriedades térmicas e estruturais

Cited by 2 publications

References 38 publications

Investigations of Latvian Illite/Kaolinite Clays Irradiated Under Action of Accelerated Electrons

Investigations of Latvian Illite/Kaolinite Clays Irradiated Under Action of Accelerated Electrons

Second law assessment of a Hoffmann kiln for the red ceramics industry

Contact Info

Product

Resources

About