Foundry sand, quartz sand supplier from Rajasthan - India

QUARTZ SAND / FOUNDRY SAND

Quartz is a pure silicate containing 99% SiO2. We manufacture medium grade quartz that’s is most suitable for foundry industries, ramming mass and other chemical industries.

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Quartz sands used as basic molding material predominantly come from the Quarternary and the Tertiary. Due to weathering conditions of the starting rocks and sediment deposition they present different qualities.

Quartz sand mining is performed by certain mechanical mining machines adapted to deposit conditions, such as bucket excavators. In addition, wet mining is also possible. Quartzsand conditioning in the mines extends to washing and purification processes followed by hydraulic classification, flotation, if necessary, and drying in rotary and fluidized bed aggregates.

The suitability of quartz grains as molding material is mainly determined by the SiO2 content. The higher the content, i.e. the fewer additions of low-melting compounds, the more favorable the sand will behave towards high thermal loads. In general, reference values for the SiO2 content lie between 94 and > 99 percent. The admissible alkali content (K2O and Na2O) lie between 0.1 and 0.2 percent, limited by alkaline earths (CaO and MgO) of 0.1 to 0.4 percent. Higher contents have the effect - especially when these are attached to grain surfaces - of a sintering point reduction. The hardening process is also affected, especially in case of acid-hardening synthetic resin binders. In this context, a fines content limitation to 0.2 to 2.0 percent is determined. Impurities contained in the fines also have a neutralizing effect in the acid hardener and for this reason cause a higher hardener consumption