Aggregate washing systems, methods, and apparatus

1. A method of washing aggregate material, the method comprising:

receiving aggregate material in a tank;

receiving water in said tank;

by at least a rear wall of said tank, retaining said aggregate material and said water in a rearward portion of said tank and preventing said water and said aggregate material from overflowing said rear wall;

agitating said aggregate material and said water to form a slurry;

advancing said slurry to a tank outlet in a forward portion of said tank;

depositing said slurry through said tank outlet;

receiving said slurry on a vibrating screen;

vibrating said vibrating screen;

moving said slurry across at least a portion of said vibrating screen;

allowing an undersize portion of said slurry to fall through said vibrating screen;

pumping at least a fraction of said undersize portion to a hydrocyclone;

by said hydrocyclone, separating said fraction of said undersize portion into an underflow fraction and an overflow fraction;

receiving said underflow fraction on said vibrating screen; and

passing product from said vibrating screen.

2. The method of claim 1 , wherein said product comprises at least a portion of said underflow fraction.

3. The method of claim 2 , wherein said product comprises a saleable sand.

4. The method of claim 1 , wherein said tank retains all water received in said tank except for water exiting the tank via said tank outlet.

5. The method of claim 1 , wherein said tank retains substantially all water received in said tank except for water exiting the tank via said tank outlet.

6. The method of claim 1 , further comprising:

by a washing element, applying water to said slurry as said slurry moves across said vibrating screen.

7. The method of claim 6 , further comprising:

by said washing element, applying water to said underflow fraction.

8. The method of claim 1 , further comprising:

by adjusting a valve, modifying a magnitude of said underflow fraction relative to a magnitude of said overflow fraction.

9. The method of claim 8 , further comprising:

transferring said overflow fraction away from said hydrocyclone via an overflow conduit; and

allowing supplemental air flow into said overflow conduit.

10. The method of claim 9 , further comprising:

by adjusting said valve, modifying said supplemental air flow.

11. The method of claim 9 , further comprising:

by adjusting said valve, increasing said supplemental air flow, thereby increasing said magnitude of said underflow fraction relative to said magnitude of said overflow fraction.

12. The method of claim 1 , further comprising:

increasing a magnitude of said underflow fraction relative to a magnitude of said overflow fraction.

13. The method of claim 1 , further comprising:

supporting said hydrocyclone above said vibrating screen and separately from said vibrating screen such that vibration of said vibrating screen does not vibrate said hydrocyclone.