Advanced Materials and Processes Research Institute
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Separation of Lead Ions on Francolite Surfaces
No full textThe separation of aqueous Pb2� onto a low-grade (�15% P2\ud
O5) carbonate-substituted rock phosphate (Francolite) mineral from Madhya Pradesh (India) was investigated. The effects of different parameters such as initial concentration of Pb2�, particle size of Francolite, and amount of substrate on lead-ion separation were studied\ud
under natural conditions by equilibrating different amounts of Francolite with aqueous lead solutions of different concentrations. Francolite was found capable of leadion separation at par with hydroxyapatite or high-grade (�25% P2\ud
O5) rock phosphate.\ud
Francolite was found very effective in removing Pb2� with a minimum lead removal\ud
of 82–99.9% and a maximum LRC (lead removal capacity) of 0.082 g of lead/g of\ud
Francolite
Effects of Partially Substituting Copper by Silicon on the Physical, Mechanical and Wear Properties of Zn-37.5% Al-Based Alloy.
No full textEffects of Alumina Dispersion on the Erosive-Corrosive Wear Response of a Zinc-Based Alloy under Changing Slurry Conditions and Distance.
No full textThis investigation analyses the influence of dispersed alumina particles on the wear behaviour of a zinc-based alloy in a slurry, comprising suspended sand particles. The influence of the sand content �in the slurry. and travel distance on the wear characteristics of the samples was also studied. Wear rate increased initially with distance, attained a peak, decreased thereafter, and finally, attained a steady-state value at longer distances. These stages were more defined when tests were conducted in the liquid �electrolyte. medium without sand. Addition of sand\ud
particles in the electrolyte reduced the wear rate of the specimens. It was also observed that when tests were conducted in the electrolyte plus sand �i.e., slurry with sand., wear rate first increased with the sand content �of the electrolyte., attained a maximum at an intermediate sand concentration, and then finally, decreased as the concentration of sand particles was increased further. The composite showed better wear resistance than the matrix alloy in general. The observations have further been substantiated through the examination of wear surfaces and subsurface regions of the samples. Wear response of the samples has been explained on the basis of �i. predominance of the operating mechanisms of material removal such as corrosive, erosive and abrasive wear under a given test condition, and �ii. the nature and properties like corrosive nature, hardness and interfacial characteristics of the various microconstituents of the samples. The study suggests that the predominance of one or more of the mentioned �materialrexperimental. parameters basically controls the wear behaviour of the specimens, and that the nature of their contribution is further governed by the specific test conditions
Attenuation of heavy metal ions by lean grade phosphorite
No full textThe sorption of heavy metal ions (Pb2+, Cu2+ and Zn2+) present as a single and as well as multiple species onto a low grade (<15%P205) carbonatic (CA) and siliceous (SL) phosphorite minerals from Madhya Pradesh (India) was investigated under natural conditions. Sorption of heavy metal ions was found to follow the order: Pb2+ >Cu2+ > Zn2+ in the cases of single and multiple species. CA was found effective in removing Pb2+, with a Pb removal of 82 – 99.9 % and a maximum L.R.C (lead removal capacity) of 0.082 g of Pb / g of carbonatic phosphorite
Preparation of Frit/Glaze from Drum Filter Cake-A Waste Generated by the Secondary Zinc Industry.
No full textDrum filter cake - a lead containing hazardous waste generated in the secondary zinc industry - has been characterised using X-ray diffraction spectroscopy, thermal studies, chemical and particle size analysis for evaluating its suitability for making a value added product. The results of characterisation have shown that the waste can be utilised as a resource material for making frit suitable for glazing of ceramic bodies. The prepared frit material was found to be substantially glassy and the leachability of lead ions, as determined using zero head extractor, was observed to be well within the permissible limit. The frit material was powdered and after mixing with clay was used for glazing application on biscuit fired unglazed ceramic tiles. These glazed tiles were tested for different physico-mechanical properties namely impact strength, flexural strength, water absorption, etc. The results of the above studies are reported in this paper
`Kinetics and isotherms for aqueous lead adsorption by natural minerals’.
No full textThe low grade (<15% P2O5) carbonatic rock phosphate and hydroxy aluminosilicate based mineral (pyrophyllite) of Madhya Pradesh (India) were investigated as adsorbents for their possible application for the removal of aqueous lead under static system. The kinetics and effect of temperature on adsorption of lead ions on the above two natural minerals have been studied. The adsorption process follows first-order kinetics and the rate of adsorption and film transfer coefficients are observed to decrease with increase in initial concentration of lead ions in solutions. It has been found that these natural minerals are effective in removing 65−99% of lead ions from 5.0 to 500 mg/L lead solutions. The Langmuir adsorption isotherm was used to represent experimental data for carbonatic rock phosphate whereas the Freundlich adsorption isotherm was found suitable to represent data for pyrophyllite. The adsorption process is found to be endothermic in the case of pyrophyllite and exothermic in the case of carbonatic rock phosphate
