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Types and uses of foundry sand
time2019/05/14
- Foundry sand is divided into silica sand and non-siliceous sand according to different mineral compositions.
Foundry sand is divided into silica sand and non-siliceous sand according to different mineral compositions. The following is introduced by OBT:
First, silicon foundry sand
The main mineral composition is silica:
(1) Natural silica sand
Used for molding sand and core sand of non-ferrous alloy castings, cast iron and small and medium-sized steel castings.
(2) Selected natural silicon foundry sand
It is used for all kinds of molding sand and core sand with organic matter as the binder.
(3) Artificial silica sand
Sand and core sand for steel castings.
Second, non-silicon foundry sand
There are many types of non-siliceous sand and their uses are different.
(1) Limestone sand
Broken from limestone, the main mineral composition is CaCO3, which is used for molding sand and core sand of steel castings.
(2) Zircon sand
The main mineral composition is ZrO2 · SiO2, which is used for core sand or surface sand of large-scale cast steel and alloy steel parts, or its mullite powder is used as coating.
(3) Magnesite
The main mineral composition is MgO, which is used for face sand and core sand of high manganese steel castings, and its mullite powder can be used as coating.
(4) Chromite Ore
The main mineral composition is chromite FeO · Cr2O3, which is used for the surface sand and core sand of large or special steel castings. Its mullite powder can be used as coating.
(5) Corundum sand
The main mineral composition is corundum α-Al2O3, which is used as a shell material for investment molds and ceramic foundry sands.
(6) Peridot casting sand
The main mineral composition is olivine (MgFe) 2SiO4, which is used for molding sand and core sand of cast iron, non-ferrous alloy castings and high manganese steel castings.