Advanced Materials and Processes Research Institute
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Flyash vermicompost from non-ecofriendly organic wastes.
No full textAround 60 million tonnes of flyash is being produced as a waste every year from different Thermal Power Plants in India. Attempts have been made to use flYash for its chemical composition for upgrading the wasteland lor agriculture purposes. The long use of flyash may impart toxicity due to the hyperaceumulation of heavy metals in soil. The present paper deals with biologically modified form of flyash by practicing Vermiteehnology. The Sisal green pulp. Parthenium and grass cuttings, were the major source of organic matter with combination of different concentration of flvash, though rich in primary, secondary and micronutrient may be lethal to the biological system if dumped repeatedly for increasing its agriculture productivity. Vermicompost treatments enhanced earthworm proliferation: The NPK content increases as compared to the standard manures. The biochemical analysis revealed the efficacy of the composts in terms of the microbial respiration and microbial number which shows declination with an increase in the concentration of flyash, but the difference was not at all very high as compared to the control except with parthenium where, the mortality was around 50% in 30% flash. 10-15 folds proliferation had been observed in the compost made from sisal green pulp. Recent investigations highlighted the ability of earthworm Eisenia foetida to partially detoxify tile toxic thermal power waste-flyash and transform sisal green pull), Parthenium and other organic rich waste into valuable vermicompost. Vermicomposting has been done to assess the impact of flyash in combination with the agricultural waste : Cowdung, Sisal Pulp, Parthenium, Grass cuttings and Eisenia _foetida's ability to vermicompost. The biofertilizer value of the vermicomPost Produced, in terms of chemical, biochemical properties highlighted the beneficial effects of the waste treatments- The enrichment of nutrients in soil admixed with flyash after being processed for vermicomposting with different organic sources would have been a better formulation of flyash for bulk utilization in agriculture
Study of Erosive-Corrosive Wear Behaviour of an Aluminium Alloy Composite through Factorial Design of Experiments.
No full textThe erosivc-cotrc~sive wear rate of a cast AI-Si ( LM6} alloy+ I0 wt.% SiC particle composite in a slurry consisting of water containing sulphuric actd and hydrochloric acid and '4{) wt.% sand ( size: 150 +_ 10 #m ). has been predicted through factorial design of experiments. The wear rate (Y) can be expressed in terms of the coded values of radial distance ( x, ). angle of inclination of the .',aunples with respect to their direction of rotation in the slurry (x:) and distance traversed I x+ ) by the following linear regression equation:\ud
Y= 21.2 + 14.87.~1 + 3.47x: + 4.025x + + 2.65xj x.. + 3.05xl x.++ 1.45x, x ~+ 1.375x t x:+¢ ,.\ud
where the multiplication factor is I0 t~ m"/m. This equation suggests that radial distance has the maximum effect on the wear rate and one must take into account Ih¢ effect of interaction of the parameters for predicting wear rate ofcoml~site materials
An analytical solution to continuous population balance model describing floc coalescence and breakage – A special case.
No full textEffect of heat treatment on tensile properties of zinc-37.5 mass%aluminium alloy containing nickel or silicon.
No full textAttention has been focussed in this study to understand the influence of microstructural changes brought about through T6 type heat treatment on the tensile strength and elongation of some zinc-37.5 mass%aluminium based alloys comprising nickel/silicon. Other (test) variables whose effects were studied include strain rate (at room temperature) and test temperature (at a typical strain rate). The study indicates that heat treatment and test conditions (strain rate and test temperature) affect the tensile properties of the zinc-based alloys to varying extents. The response of the alloys under different test conditions has been explained on the basis of specific characteristics of their various microconstituents. It has been observed that factors like microcracking tendency and thermal stability greatly control the mechanical properties of the samples. The predominance of the parameters over each other depends on the test conditions. Accordingly, the alloys exhibit changing properties as the condition of testing alters
Response of Some Cast Zinc - 37.5% Al - Based Alloys Comprising Nickel/Silicon Under Different Tensile Loading Conditions
No full text
Annual Progress Report of Regional Research Laboratory, Bhopal for the period from 1997-1998
No full textAnnual Progress Report of Regional Research Laboratory, Bhopa
Dry Sliding Wear Behaviour of a Zinc-Based Alloy Against Different Counterface Materials
No full textRemoval of graphite from lead rougher concentrate using water-only cyclones
No full textWater-only cyclones use water as medium for separation of minerals on the basis of specific gravity. Water-only cyclones are presently being used in coal processing and its applicability in processing mineral fines has not been explored. In the present study, the possibility of using water-only cyclones to separate graphite from lead rougher concentrate is analysed on the basis of investigations carried out.\ud
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Experiments were conducted on lead rougher concentrate of Hindustan Zinc Ltd., India, using a 76 mm water-only cyclone to obtain a lead concentrate having less than 3% graphite. A 23 factorial experiment was carried out to study the effect of important variables such as vortex finder diameter, apex diameter and percent solids on the separation of graphite and galena. These results show that the diameter of vortex finder has a significant effect on the separation of graphite. The experiments indicate that it is possible to get a lead concentrate of 39% lead with 2.6% graphite at a recovery of 45% from a feed assaying 19.6% lead and 9.8% graphit