SAND MIX, FORMED PRODUCT FOR FOUNDRY AND METHOD TO PRODUCE SUCH PRODUCT Russian patent published in 2010 - IPC B22C1/18 

FIELD: process engineering.

SUBSTANCE: invention relates to foundry. Mix consists of sand mix, solution of sodium hydrate of 0.1 to 10 wt %, binder of the base of alkaline metal silicate of 0.1 to 5 wt % and suspension additive in amount of 0.1 to 3 wt %. Sand mix particle size varied from 0.1 to 1 mm. Sodium hydrate solution concentration varies from 20 to 40 wt %. Aforesaid binder contains solid matter in amount of 20 to 70%. Suspension contains solid mater in amount of 30 to 70%. Suspension represents spherical particles of amorphous SiO₂ in the form of two granulometric fractions, fraction A consisting of SiO₂ particles of 1 to 5 µ, and fraction B consisting of SiO₂ particles of 0.01 to 0.05 µ. Volume ratio of both fractions varies from 0.8:1.0 to 1.2:1. Proposed mix is used to produce formed product.

EFFECT: higher mix plasticity and hardening rate.

9 cl, 8 dwg, 6 tbl, 3 ex