Tell us about yourself!
What you showed and what you used is NOT a colander, it is a sieve. Apart from everything else wrong here (see above comments) it would help to get the tools named correctly. A colander would not sort the sand particles whatsoever.
Compost Tumbler Sifter
Why would you keep raw/uncooked rice in a freezer? And if it is cooked rice in your freezer ... well all of the uses shown use raw/un-cooked rice.
I reckon an airtight container is cheaper to run than a freezer. ;-)(I keep most dry goods in tins or plastic airtight containers. There's not enough room in my freezer for all the rice, flour, and assorted other grains.)