Advanced Materials and Processes Research Institute
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A room temperature process for making Mn2O3 nano-particles and γ-MnOOH nano-rods
No full textNano-size crystals of Mn2O3 and MnOOH have been prepared by a simple precipitation process using dilute aqueous solutions of manganese sulphate and ammonia in the presence of sodium lauryl sulphate — a surface active agent. X-ray diffraction spectrometry has been used to identify the phases and to calculate the size of the nano-size crystals using the Scherrer method. The morphology of the crystals has been studied by TEM/HRTEM and Edax has been used to estimate their elemental constituents. The sonication of the prepared nano-size material in acetone leads to the conversion of MnOOH to nano-sized Mn2O3
REMOVAL OF HEAVY METALS USING HYBRID PRECURSOR PREPARED BY AGRO RESIDUE
No full textRice husk is an abundantly available waste material in all rice producing countries. In certain regions this low value agricultural by product is used as a fuel for parboiling paddy in rice mills, it produced 13-15MJ/kg of energy. The partially burned rice husk in turn contributes to more environmental pollution. This rice husk contains nearly 20 percent silica, can be made into adsorbent material, which is used, in environmental remediation. Developed countries have accepted and followed the concept of “no waste” and all such materials are termed as “new resources” for new material development through value addition. In the present study hybrid precursor, which contains both carbon and silicon, used for the removal of heavy toxic metals, such as lead, copper and zinc present in wastewater .The efficiency of the hybrid precursor in the removal of heavy metals is approximately 90%
Influence of fiber orientation on high stress wear behavior of sisal fiber reinforced epoxy composites.
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Separation characteristics of coal fines in a Knelson concentrator- A Hydrodynamic Approach.
No full textThe Knelson concentrator has found wide acceptance in the gold\ud
processing industry to recover fine free gold particles from the\ud
milling circuits. Several case studies have recently been reported to\ud
extend its applications for processing various mineral fines with\ud
limited success. A few empirical models have also been developed,\ud
but there has been hardly any attempt to understand the basic particle separation mechanism inside this equipment. An attempt has,\ud
therefore, been made to understand the separation characteristics\ud
of coal fines in a Knelson concentrator. The entire exercise has\ud
revealed that this equipment can produce a clean coal ash content\ud
of 17% from a feed coal ash content of around 36%. The hydrodynamic analysis provided will also help in understanding the roles\ud
of centrifugal force and the fluidization water to process various\ud
other mineral fines using a Knelson concentrator
On the moduli of closed cell aluminum foam.
No full textThe moduli of porous materials have been extensively studied analytically as well as experimentally. Several empirical and analytical equations were proposed to express the effective moduli of porous solids. In the present investigation, a few of these relations\ud
were checked for experimental validity in the case of closed-cell aluminum foams. Also, this study brings out the relative merits of\ud
these expressions
Thermal Immobilization of Cr, Cu and Zn of Galvanizing Waste in the Presence of Clay and Fly Ash
No full textIn the present investigation thermal treatment of galvanizing waste with clay and fly ash has been carried out to immobilize Cr, Zn, Cu and other metals of the waste at temperature range 850 degrees C to 950 degrees C. Leaching of the metals from the waste and solidified product was analyzed using toxic characteristic leaching procedure (TCLP). Results indicated that the composition of waste and clay treatment temperature are the key factors in determining the stability of solidified product. After heating at 950 degrees C, the solidified specimens of 10% waste with clay have shown comparatively a high compressive strength and less water absorption. However, a decrease in compressive strength and increase in water absorption were noticed after addition of 15% of waste with clay. The leachability of all the metals present in the waste was found to reduce considerably with the increase of treatment temperature. In the case of Cr and Zn, their leachabilty was found at unacceptable levels from the treated product obtained after heating at 850 degrees C However, their leachability was reduced significantly within an acceptable level after treatment at 950 degrees C. The thermal treatment has shown an increase of re-oxidation trend of Cr (III) to Cr (VI) up to 900 degrees C of heating and this trend became almost zero after heating at 950 degrees C. Addition of fly ash did not show any improvement in strength, durability and leachability of metals from the thermally treated product. X-ray diffraction (XRD) analysis of the product confirmed the presence of mixed phases of oxides of toxic metals
Dry Sliding Wear Response of Zinc-Based Alloy over a Range of Test Speeds and Loads: a Comparative Study with Cast Iron
No full text\ud
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This study pertains to the observations made during the sliding wear response of a zinc-based alloy \ud
in different test conditions. The effects of sliding speed and load on the wear behaviour of the \ud
alloy have been studied. The properties evaluated were wear rate, frictional heating and coefficient \ud
of friction. The wear performance of the zinc-based alloy has been compared with that of a \ud
conventional cast iron in identical test conditions. The wear rate of the samples increased with \ud
applied load and sliding speed while the seizure resistance (load) deteriorated with speed. The \ud
zinc-based alloy exhibited less wear rate and reduced frictional heating than that of the cast iron \ud
while friction coefficient followed a reverse trend. Observed wear response of the samples has been discussed in terms of specific features like lubricating, load carrying, microcracking and thermal stability of various micro constituents of the samples, and substantiated further through the features of wear surfaces, subsurface regions and debris. KEY WORDS: zinc-based alloy, cast iron, dry sliding wear behaviour, microstructure-property \ud
correlations, material removal mechanisms\u
Effect of Si Cp addition on age hardening of aluminum composite and close cell aluminum composite foam.
No full textThe age hardening behavior of solid Al-alloy–\ud
SiCp composite and closed cell Al-alloy–SiCp composite\ud
cellular materials has been examined and compared. The\ud
peak aging period of these materials were also compared\ud
with that of the solid unreinforced alloy. The effect of SiCp\ud
content on the peak aging time has been examined. It was\ud
found that the composite aged faster than the alloy irrespective of SiCp content, wherein peak aging time was\ud
invariant to SiCp content. On the other hand, while the\ud
closed cell composite foam reached a peak aged condition\ud
faster than the alloy when SiCp content was less than\ud
10 wt%, further increases in SiCp content delayed the agehardening kinetics