Bentonite is used as a binder in foundry sands in molds production.
Fig.1-Green-sand casting
Silica sand is the main component in foundry sand. It forms a structural framework of the mold due to bentonite as it binds sand particles which results in the mold strength. The main advantage of bentonite is an ability to restore its properties after extra moistening. This makes it possible to use the foundry sand after pouring metal and knockout of casting several times. Multiple use of foundry sand with bentonite significantly reduces the expenses related to waste removal and their disposal.
Interesting fact: Today bentonite consumption for the production of 1 ton of cast iron castings makes 60-90 kg, of 1 ton of steel castings makes 90-120 kg.
In the total casting output of industrialized countries, 65-70% of steel and cast iron castings of small and medium weight are produced in green-sand mixtures.
In the production of “Bentacarb” coal-ash bentonite mixture series of products bentonite from “10th Khutor” deposit is used for cast iron casting production. In the production of bentonite powders for foundry sands bentonites from “10th Khutor”, Dash-Salakhlinskoye and Ziryanskoye deposits are used for cast iron, steel and non-ferrous castings.
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