Charred bone: Physical and chemical changes during laboratory simulated heating under reducing conditions and its relevance for the study of fire use in archaeology

2016 ◽  
Vol 10 ◽  
pp. 282-292 ◽  
Author(s):  
Femke H. Reidsma ◽  
Annelies van Hoesel ◽  
Bertil J.H. van Os ◽  
Luc Megens ◽  
Freek Braadbaart
Keyword(s):  
Chemical Changes ◽  
Fire Use ◽  
Reducing Conditions ◽  
Physical And Chemical

scholarly journals SiO2 Promoted CaO Diffusion to C Phase at 1500 and 1700 °C

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 587
Author(s):  
Lijuan Ni ◽  
Renxing Wang ◽  
Qingya Liu ◽  
Junfei Wu ◽  
Yue Pan ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Close Contact ◽  
Chemical Changes ◽  
Physical And Chemical ◽  
Diffusion Behaviors

To better understand the mass transfer behaviors in CaC2 production from CaO and coke, this paper studies the diffusion behaviors of CaO and graphite, with or without ash, at 1500 and 1700 °C. CaO and graphite are pressed into tablets and heated alone or in close contact. Physical and chemical changes in these tablets are analyzed by XRD and SEM+EDX. In some experiments, thin Mo wires are placed between the closely contacted CaO and graphite tablets to identify the diffusion direction. It is found that the diffusion between CaO and low-ash graphite is very limited. SiO2 in a high-ash graphite diffuses into CaO tablet and reacts with CaO to form Ca2SiO4, which then diffuses into the graphite tablet easily and leads to CaC2 formation at 1700 °C.

Physical and chemical changes resulting from heat treatment of soya and soya alginate mixtures

1987 ◽  
Vol 7 (1) ◽  
pp. 17-33 ◽  
Author(s):  
C.G. Oates ◽  
D.A. Ledward ◽  
J.R. Mitchell ◽  
I. Hodgson
Keyword(s):  
Heat Treatment ◽  
Chemical Changes ◽  
Physical And Chemical

Development of anin vitrosystem simulating bucco-gastric digestion to assess the physical and chemical changes of food

2002 ◽  
Vol 53 (5) ◽  
pp. 389-402 ◽  
Author(s):  
C. Hoebler ◽  
G. Lecannu ◽  
C. Belleville ◽  
M.-F. Devaux ◽  
Y. Popineau ◽  
...  
Keyword(s):  
Gastric Digestion ◽  
Chemical Changes ◽  
Physical And Chemical

Physical and chemical changes in coal fly ash during acidic or neutral wastes treatment, and its’ effect on the fixation process

Fuel ◽  
2016 ◽  
Vol 184 ◽  
pp. 69-80 ◽  
Author(s):  
Roy Nir Lieberman ◽  
Xavier Querol ◽  
Natalia Moreno ◽  
Yitzhak Mastai ◽  
Haim Cohen
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Chemical Changes ◽  
Physical And Chemical

Structural Changes on Charring Woods of Dichrostachys and Salix from Southern Africa: The Effect of Moisture Content

IAWA Journal ◽  
1986 ◽  
Vol 7 (3) ◽  
pp. 243-250 ◽  
Author(s):  
Juliet Prior ◽  
K. L. Alvin
Keyword(s):  
Moisture Content ◽  
Southern Africa ◽  
Structural Changes ◽  
Initial Increase ◽  
Dichrostachys Cinerea ◽  
Chemical Changes ◽  
Structural Alterations ◽  
Wood Pyrolysis ◽  
Effect Of Moisture ◽  
Physical And Chemical

Air-dried and saturated cubes of fully developed wood of Dichrostachys cinerea (Leguminosae) and Salix subserrata (Salicaceae) were charred for 60 minutes at 400°C. An initial increase in moisture content caused few structural alterations in Salix but in Dichrostachys it resulted in considerable ray distension and massive deformation of non-gelatinous fibres. An attempt is made to correlate these observations with the physical and chemical changes known to occur during wood pyrolysis.

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