Sand Reclamation
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The document discusses foundry sand reclamation. It explains that reclamation offers economic and environmental benefits by reducing purchase and freight costs of new sand and complying with regulations. The key steps in reclamation are shakeout, crushing, cooling, scrubbing, classification, and storage. There are four main types of reclamation: dry, wet, thermal, and combined wet and thermal. The thermal process is suitable for oil-bonded sands without clay and for non-ferrous foundries. Reclamation systems must effectively remove impurities, coatings, and fines to produce sand with uniform properties for casting.
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Fire bricks are made primarily to withstand high temperatures and contain silica, alumina, and other oxides. Their manufacturing process involves selection of materials, preparation, molding, drying, and firing. Sand lime bricks contain sand, lime, and water and are made through a similar process.
The document compares the ingredients and properties of fire bricks and sand lime bricks. It also discusses common defects in bricks and classifications based on quality.
Geopolymer membrane.pptx
In this file, the history of geopolymer materials is discussed, the reaction mechanism and the applications of geopolymer membranes are illustrated.
Recyledaggregates 140110194229-phpapp01
Recycled aggregates are produced from construction and demolition waste and comprised of crushed, graded inorganic particles. They provide environmental benefits over natural aggregates by reducing usage and waste. While recycled aggregates have properties like lower strength and higher water absorption compared to natural aggregates, they can be used in applications like embankments, backfill, and building blocks. Recycling techniques include two-stage mixing, mechanical scrubbing, and heated scrubbing to remove adhered cement paste from aggregate surfaces.
Design, Construction and Test of Corrosion
This document describes the design, construction, and initial testing of a corrosion simulation rig to study tribocorrosion. Key points:
- The rig was designed to spray an oil-water mixture at high velocity onto metal coupons to simulate conditions in oil pipelines.
- Initial tests used mild steel coupons, with one exposed to pure oil and another to an acidic salt solution. The pure oil showed no corrosion while initial results for the solution indicated corrosion occurring.
- Further testing is needed as the pump failed after only 2 hours in the second test. Replacing the pump would allow longer term experiments and more accurate analysis of corrosion rates under different conditions.
- The rig provides a way to study trib
Studies on Graded Cemented Carbides
Graded cemented carbides are functionally graded materials where the composition of tungsten carbide and metallic binder such as cobalt is varied from the surface to the interior of the material in order to provide both high hardness and wear resistance on the surface with high toughness in the core. These materials are produced using powder metallurgy techniques to create composition gradients and are then consolidated using liquid phase sintering or microwave sintering to achieve full density. Graded cemented carbides have applications in cutting tools, mining, and construction due to their improved mechanical properties over traditional cemented carbides with a uniform composition.
A Contractor’s Perspective on Redeveloping Historical Landfills
Andy O'Dea, Technical Director of Cognition Land and Water, discusses challenges with redeveloping historical landfills. Key challenges include overly complex waste regulation, the unsuitability of using the Definition of Waste Code of Practice (DoWCoP) for landfill restoration projects, and lack of clear guidance. Through project examples, O'Dea illustrates how using DoWCoP previously allowed sustainable reuse of soils but the revised agency position now prohibits this for landfilled materials. He calls for pragmatic solutions like a new recovery permit to better facilitate sustainable management and reuse of surplus soils from construction projects.
Ccc
This document summarizes the process of making carbon-ceramic composites. It discusses using phenol formaldehyde resin and either graphite flakes or silicon carbide particles to make the composites. The materials are ball milled and hot pressed to form green composites. The green composites are then carbonized in nitrogen gas at high temperatures to form carbon-ceramic composites. The composites are characterized using SEM, XRD, and tribometry to analyze their microstructure, composition, and tribological properties.
Carbon fiber synthesis
There are four main steps in the production of carbon fiber
1) melt spinning
2) oxidization/precarbonization
3) carbonization and
4) graphitization.
Cement Industries
Lecture Slides by Prof. Imitaz Ali at Ghulam Ishaq Khan Institute for Engineering Sciences and Technology (GIKI).
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Sand Reclamation
- 1. Foundry Sand Reclamation A Presentation by Abhishek.V.Hukkerikar,
- 2. 1. Increased interest in reclamation in recent years. 2. Consistent & adequate supply. 3. Uniform properties & characteristics. 4. Delivery cost & delay in maintaining considerable stock.
- 3. Background • Economical Increase !! (40% in Purchase & 125% in freight) • Environmental Federal regulations & Chemical Composition of sand • Technical Pre- coated with resin & catalyst & strong grains
- 4. Requirements of SR Systems • It should remove lumps. • Removal of magnetic & non magnetic impurities. • Removal of inert organic material. • Good grain distribution. • It should give casting a good finish & appearance. • Removal of fines. • Removal of coatings to a uniform level.
- 5. Shakeout Crushing Cooling ScrubbingClassification Storage & mould making Metal Pouring Basic Steps
- 6. Types of Reclamation 1. Dry reclamation -No restoration of original quality -Does not remove the organic matter completely 2. Wet reclamation -Partly removes coating -Partly removes organic matter 3. Thermal reclamation -Suitable for oil bonded sands with no clay -Suitable for non-ferrous foundries (Core molding) 4.Combined wet + thermal reclamation -Restores original quality -Removes organic matter completely
- 7. The Process Shakeout Bucket conveyor RD1 FBCT1 RD2 FBCT2 CT To Reclaimed sand silo
- 8. The Process
- 9. Advantages • Offers economic utilization • Self sufficiency • No freight charge & delay • No necessity of bulk inventory • Character specific
- 10. Thank you for your Patience Any Questions??