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q illustrate moisture content test moisture content test moisture is an important constituent of moulding sand its content in the moulding sand can
q what are the basic use of sand rammerit is the apparatus of make specimens of moulding sand for tests such as - permeable test the various strength
q explain basic types of sand testingmoulding sands should be of proper quality to meet the required level of accuracy and surface finish of castings
q explain moulding sand for non-ferrous casting the melting point of non- ferrous metal is much lower than that of ferrous metals therefore the
describe mould surface coatingmould surfaces are coated after the pattern is drawn out with certain materials possessing high refractoriness
q describe dry and wet parting materialsdry parting materials these are applied by dusting these include charcoal ground bone and limestone
q explain system and parting sandsystem sand in mechanized foundries where machine moulding is employed a so called system sand is used to fill the
explain the typical wastewater characteristicstotal suspended solids 100 - 350 mgl 200 mgl is the typical value bod5 100-300 mgl 200 mgl is
q describe the type of facing and backing sandfacing sand this sand is used directly next to the surface of the pattern and comes into contact with
q explain the cushion materials which used in moulding sandthese materials when added to the moulding sand burn and from gases when the molten metal
explain the tertiary treatment for wastewatertertiary treatment in cases where secondary treatment is not adequate particularly if the discharges are
explain the secondary treatment for wastewatersecondary treatment to remove soluble bod that escapes the primary treatment and to provide added
q describe facing materialfacing materials these materials when added to the moulding sand tend to obtain smoother and cleaner surfaces of
explain the primary treatment for wastewaterprimary treatment to remove the pollutants that floats or settles typically 60 of suspended solids and 35
q can you explain about fuel oil and dextrinfuel oil it improves the mould ability of sandiron oxide it develops hot strengthdextrin it increases air
q illustrate wood and silica flourwood flour it is ground wood particles or other cellulose materials such as grain hulls they serve the same purpose
define wastewater treatment processesthe wastewater treatment processes that we design mimic the processes that occur in the nature for example
q how can we use cerealsfoundry cereal is finely ground corn flour or corn starch it 025-2 increases the green and dry strengths of the moulding sand
q can you illustrate sea coalsea coal or coal dust is finely ground soft coal pulverized coal it is added to moulding sand used to make ferrous
explain chlorine residualsfree chlorine residuals cl2 hocl ocl- combined chlorine residuals chloramines mono di and tri chloraminesthe
q why we need additives explainadditives are the materials added in small quantities to the moulding sand in order to enhance its exiting properties
q describe organic binders and its workingorganic binders the binders are most frequently used in core making cereal binders are obtained from wheat
q can you explain bentonite bindersits general composition is mgoal2o3sio2h2o it is formed by weathering of volcanic or igneous rocks it is a creamy
q describe fire clay and kaolinite bindersfire clay fire clay is refractory clay usually found in the coal measureskaolinite its general composition
explain some points regarding to hardness1 hardness removal using lime and soda is based on the solubility reactions of calcium carbonate caco3 and