Special composite silica sand-LIANXIN SAND GROUP

Special composite silica sand

The surface morphology of natural silica sand is complex, with protrusions, depressions, saddles, and pores of various shapes, which have different effects when bonding with casting binders. The R & D center of Lianxin Casting Sand Group uses interface treatment technology to carry out sizing repair treatment on the surface of silica sand to form "special composite silica sand".

Classification:

Special composite silica sand

Key words:

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| The study found that:

| Features:

The slurry repairs the surface defects of the silica sand, improves the utilization rate of the binder, and improves the strength of the sand core; the slurry is coated on the surface of the silica sand to form a transition layer, which not only forms a strong chemical bond with the surface charge of the silica sand, but also can be well compounded with the binder to improve the strength of the sand core.

| Advantages:

The resin sand core has high strength, which can reduce the amount of resin added, reduce the amount of sand core gas, and improve the qualified rate of castings.

| Numerical simulation technology of micro fracture mechanism of sand core structure

Products	Amount of village fat	Initial strength mpa	1h	5h	7h	24h	Gas volume ml/g	Burning reduction/%
Drying sand	1.40%	1.51	1.81	1.98	1.95	2.07	12.9	1.7
modified sand	1.40%	1.71	2.15	2.49	2.4	2.75	13.5	1.85
modified sand	1.10%	1.38	1.67	1.93	2.17	2.25	10.2	1.42