Sand Dealers in Thane (21 products available)

Material : Olivine Sand

Application : Refractory Brick

Packaging Type : HDPE Bags, PP Bags

Packaging Size : 25kg, 50kg, 1000kgs

SiO2 Content (%) : 39%

MgO Content (%) : 44%

What is olivine? olivine is a natural mineral consisting of a solid solution of approximate 93 % magnesium ortho silicate (forsterite) and 7 % iron orthos silicate (fayalite). The rock dunite located in india, is composed of about 90% olivine, the remaining 9% being minerals like pyroxene, spinals, chromite and chlorites. As forsterite has a melting point of 1890oc , olivine has a very high refractoriness, which was the original reason for the interest in olivine later on, olivine has proved to have many other valuable properties for foundry purposes. Chemical composition mgo : 43 - 49.0 %(typical) sio2 : 37 - 40.0 % fe2o3 : 8 - 12.0 % cr2o3 : 0.4 % al2o3 : 0.5 - 2.0 % nio : 0.35 % mno : 0.10 % cao : 1.34 % physical properties the high content of forsterite (having melting point 1980 o c) gives high refractoriness and ability to resist reaction with molten metals and slag. The heat conductivity is high at temperatures below about 800 o c (0.0310 c.g.s). The heat capacity is relatively high, which gives the olivine good cooling ability. Thermal expansion of olivine in comparison to other sands as below. Fire resistance : olivine has a melting point of approax.1760ã�â° c and therefore fulfil this demand. The sintering point is a very important property of sand for foundry purposes, sintering is often defined as " the bonding of powered material by solid state reactions at a temperature lower than that required for the formation of liquid phase". Olivine has a sintering area of 1450 - 1500 o c. olivine has a high resistance of thermal shock which gives durability and long life of the sand. Because of this smaller additions of new sand are required to unit sand system. High temperature reaction : at elevated temperature, silica sand has an acid reaction. It will react with certain elements such as manganese, which will cause burn-on the castings. Olivine is basic in nature, and will not react with manganese. Olivine gives a much faster cooling rate than silica. This chilling effect can be utilized to produce favorable thermal gradients that promote directional solidification and give sound castings with increased yield. Olivine sand may be bonded with all the bonding agents used in a variety of production of alloy ranging from the graded cast iron to manganese steel foundries today, like bentonite, portland cement, sodium silicate, oils, hot box etc., . Due to its basic character it has however, a very high acid demand and has therefore a restricted use with furan resin process. Olivine sand can be extensively use for cold box process in the production of moulds and coarse. It is highly suitable for the later generation binder systems like alfa and beta process which are alcohol systems. Olivine sand being denser than silica, requires less clay for bonding purposes, but due to its high angularity, slightly larger quantities of liquid binders are necessary. Olivine has a lesser thermal expansion rate than quartz. A lower thermal expansion rate which is a desirable characteristic indicates that moulds made from olivine foundry sand aggregate low buckling and scabbing tendencies. This is true irrespective of any bounding process employed in the production of moulds and coarse. As a foundry aggregate, olivine offers a high fusion point, low uniform thermal expansion and ability to resist fracture from thermal shock. The angularity of the grains acts as a control on density of a mould. This feature coupled with the favorable co - efficient of thermal expansion usually permits the elimination of organizes buffers from sand mixes. The comparatively light burn - on effect produced by olivine sand can probably be described to their low capacity for wetting by molten metal high refractoriness and freedom from allotrophic transformations during heating. This could be eliminated by the adoption of proper coating technology. When olivine sand is used, high manganese steel it shows little penetration this is due to minimal metal - moul

Material : Zicron

Application : Industrial Coatings

Color : Brown

Packaging Type : Loose

Shelf Life : 4 Months

Usage/Application : Used In Foundry, Ceramic And Refractory

Material : Sand

Application : Filtration, High-strength & Very High

Color : Brown

Purity : 99%

Form : Powder

Packaging Type : HDPE Bag, Packet, PP Bag