Dewatering sand with surfactants

Details Dewatering sand with surfactants Dewatering sand with surfactants

2002-05-01

2004-09-28

Hruskoci, Peter A. (Department: 1724)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C209S005000, C210S732000, C210S747300, C210S770000, C210S778000

Reexamination Certificate

active

06797180

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method for enhancing the dewatering of sand through the use of various surfactants.
BACKGROUND OF THE INVENTION
Crushed aggregate materials, such as sand or slag, and other materials which are handled as slurries, must be dewatered prior to subsequent handling.
Sand mines throughout the world process sand in a similar manner. A wet process is used to extract sand from the mine, and the sand is pumped to a processing facility. At the processing facility, sand and water are separated, and the sand is sized. Sand and water (about 85% solids) is then transported to a stockyard for storage and drying. Typically, a 15,000 ton sand pile drains down to about 3.5% moisture over about a 15 day period. The sand is processed in a furnace to evaporate the moisture to about 0.1%. Energy efficiency and productivity are important considerations in the mining industry.
SUMMARY OF THE INVENTION
The present invention provides a process to enhance the removal of water from wet sand in a sand dewatering operation. The present inventors discovered that the addition of an anionic or nonionic surfactant to a sand slurry prior to dewatering significantly reduced sand moisture after stack out.


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