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Introduction to chromite ore
Chromite sand also called chromite sand, with special sand casting, with chromite based natural spinel, crushing, grinding, screening into a specified size, suitable for molding (core) sand. According to the chemical composition of chromite sand is divided into 2 levels; a level Cr2O3 = 45%; Cr2O3 = 35%. two chromium ore in casting production is mainly used for large steel casting sand surface, prevent the casting surface adhering sand; secondly the mill for refractory casting coating; chromium ore is chill material in the other (core) can be part of the cold iron.
Casting iron ore is products by crushing and screening process of natural chromite, the main chemical components of the Cr2O3. sand heated volume stability, high thermal conductivity, contact with the molten metal not only has anti alkaline slag good effect, and no chemical reaction such as iron oxide, and also has solid sintering, can well prevent the infiltration of molten metal, avoid sand defects.
Chromite ore characteristics
Chromite in molding material is the special category of sand, the main mineral composition of FeO.Cr2O3, the density is 4 ~ 4.8g/cm3, Mohs hardness of 5.5 to 6, refractoriness is greater than 1900 DEG C, chromite sand anti alkaline slag good effect, with iron oxide and other chemical reaction. Because of chromite sand several times larger than the thermal conductivity of silica sand, and sintering in the molten metal in the casting process, so as to prevent the infiltration of molten metal.
1, iron ore with chilled excellent characteristics, this property does not reduce the hot cracking, but can affect the temperature gradient, promote directional solidification without cold iron.
2, iron ore is inert, and with other metal oxides react, it is not wetted. Manganese manganese steel castings can be successfully used for chromite sand. If mold is normal paint brush and silica content is low, there is no fayalite reaction.
3, iron ore expansion, and the expansion is one of the possible factors causing the casting sand, so it can be used to mix the wet sand for large castings.
Use of chromite ore
Chromite sand for drainage of sand material, casting, ceramics, glass and refractory materials. Iron ore for types: casting special, special metallurgical grade chromite. In casting production is mainly used for large steel casting sand surface, prevent the casting surface adhering sand; secondly the grinding powder used for refractory casting coating. Chromium ore is chill material in the other (core) can be part of the cold iron. Iron ore is suitable for casting coating, refractory materials, brake pads, high performance ceramic materials, ceramic and glass colorant, friction materials, chemical and metallurgical casting and other fields.