scholarly journals Physicochemical Characterisation for Potential Uses as Industrial Mineral of Bauxite from Débélé, Guinea

2021 ◽  
Vol 09 (03) ◽  
pp. 9-22
Author(s):  
Mamadou Yaya Balde ◽  
Chantale Njiomou Djangang ◽  
Ramatoulaye Binta Diallo ◽  
Philippe Blanchart ◽  
Daniel Njopwouo
Keyword(s):  
Industrial Mineral ◽  
Physicochemical Characterisation

Molecular, rheological and physicochemical characterisation of puka gum, an arabinogalactan-protein extracted from the Meryta sinclairii tree

2020 ◽  
Author(s):  
MSM Wee ◽  
Ian Sims ◽  
KKT Goh ◽  
L Matia-Merino
Keyword(s):  
Hydrodynamic Radius ◽  
Average Molecular Weight ◽  
Gum Arabic ◽  
Water Soluble ◽  
Arabinogalactan Protein ◽  
Type Ii ◽  
Weight Average Molecular Weight ◽  
Soluble Polysaccharide ◽  
Physicochemical Characterisation ◽  
Increasing Temperature

© 2019 Elsevier Ltd A water-soluble polysaccharide (type II arabinogalactan-protein) extracted from the gum exudate of the native New Zealand puka tree (Meryta sinclairii), was characterised for its molecular, rheological and physicochemical properties. In 0.1 M NaCl, the weight average molecular weight (Mw) of puka gum is 5.9 × 106 Da with an RMS radius of 56 nm and z-average hydrodynamic radius of 79 nm. The intrinsic viscosity of the polysaccharide is 57 ml/g with a coil overlap concentration 15% w/w. Together, the shape factor, p, of 0.70 (exponent of RMS radius vs. hydrodynamic radius), Smidsrød-Haug's stiffness parameter B of 0.031 and Mark-Houwink exponent α of 0.375 indicate that the polysaccharide adopts a spherical conformation in solution, similar to gum arabic. The pKa is 1.8. The polysaccharide exhibits a Newtonian to shear-thinning behaviour from 0.2 to 25% w/w. Viscosity of the polysaccharide (1 s−1) decreases with decreasing concentration, increasing temperature, ionic strength, and at acidic pH.

SURVEI POTENSI PASIR KUARSA DI DAERAH KETAPANG PROPINSI KALIMANTAN BARAT

2012 ◽  
Vol 11 (2) ◽  
Author(s):  
Teguh Prayogo ◽  
Bayu Budiman
Keyword(s):  
Glass Industry ◽  
Quartz Sand ◽  
Mineral Resources ◽  
Cement Industry ◽  
Laboratory Analysis ◽  
Rock Weathering ◽  
West Kalimantan ◽  
White Sand ◽  
Quartz Sands ◽  
Industrial Mineral

Ketapang area is one of lower part or southern sub-province of West Kalimanatan Province, which is located geographically between 108o40’ and 111o20’ in Longitude and between 0o20’ and 3o04’ in Latitude. This area has various of industrial mineral resources, for example quartz sand. Quartz sand or also calledwith white sand is the reasult of rock weathering that contents main mineral, such as quartz, and felsdpar. Then, the result of weathering is cleaned and transported by water or wind and deposited in the stream side, lake or sea. In this paper will bedescribed concerning to locations, characteristics, and usages of quratz sand in Ketapang area, West Kalimantan Province. Based on chemical or laboratory analysis and interpretation, the quartz sands can be used as glass industry, cement industry material, and moulding industry.

Physicochemical characterisation of mangafodipir trisodium

1997 ◽  
Vol 38 (5) ◽  
pp. 780-789 ◽  
Author(s):  
Birgit Tirkkonen ◽  
A. Aukrust ◽  
E. Couture ◽  
D. Grace ◽  
Y. Haile ◽  
...  
Keyword(s):  
Mangafodipir Trisodium ◽  
Physicochemical Characterisation

Limestone - A Crucial and Versatile Industrial Mineral Commodity

Fact Sheet ◽  
2008 ◽  
Author(s):  
James D. Bliss ◽  
Timothy S. Hayes ◽  
Greta J. Orris
Keyword(s):  
Mineral Commodity ◽  
Industrial Mineral

A new industrial mineral: Huntite and its recovery

2006 ◽  
Vol 19 (4) ◽  
pp. 376-378 ◽  
Author(s):  
Olgaç Kangal ◽  
Ali Güney
Keyword(s):  
Industrial Mineral

Control of properties and structure of steel vessels by cooling in various media at the outlet of rolling and pressing lines

2021 ◽  
pp. 34-38
Author(s):  
R. L. Shatalov ◽  
V. A. Medvedev
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Metal Structure ◽  
Machine Building ◽  
Regression Equations ◽  
Wide Range ◽  
Industrial Mineral ◽  
Cooling Media ◽  
Technological Limitations ◽  
Non Destructive

When controlling the mechanical properties and structure of vessels made of carbon structural steels manufactured by hot deformation on rolling and pressing lines (PPL) of machine-building enterprises of Russia, such cooling media as water, I20 industrial mineral oil, air are used. The applied cooling media are able to provide the workpieces with a given structure with a wide range of mechanical properties. However, the cooling media have a number of technological limitations and conditions of the use, non-compliance with which leads to reject. When cooled in oil, the probability of ignition is high; when cooled in water, hardening cracks may form, and air is not always able to provide the required rate and uniformity of heat transfer to the environment. The efficiency of control of physical and mechanical properties and structure of deformed vessels made of 50 steel by cooling in TERMAT polymer aqueous solutions in different concentrations on PPL of the plant of JSC NPO Pribor was studied. The effect of varying the concentration from 2 to 9% of TERMAT polymer on the formation of metal structure, as well as physical and mechanical properties of hot-deformed vessels was studied. The results of testing the strength and plastic characteristics of vessels by destructive and non-destructive control methods are presented. According to the results of physical and mechanical properties, regression equations were obtained with at least 95% reliability of R2, which establish the relationship between the controlled plastic and strength parameters of the vessel metal`s properties. The conducted researches allowed to compare the indicators of the main physical and mechanical properties of steel vessels at the PPL outlet and to propose methods of inhomogeneity control that reduce time and material costs by 5–10% during the tests.

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