La description
Sodium bentonite expands when wet, absorbing as much as several
times its dry mass in water. Because of its excellent colloidal
properties (see Odom ref below), it is often used in drilling mud
for oil and gas wells and for geotechnical and environmental
investigations.
Sodium
Bentonite
Sodium bentonite is a natural sealant and is used for sealing stock
and recreational ponds, dairy and sewage lagoons, and city
landfills. It is also effective as a hole plug as well as for
controlling dust on highways. Sodium bentonite is one of the "most
effective low cost methods" of treating porous soils. It is so
effective, that the Federal Government and most states require a
liner of sodium bentonite or material comparable, to be used to
seal toxic waste lagoons and abandoned water and oil wells. It is
environmentally safe, because it contains no chemicals, no
additives, nothing toxic.
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How Does Sodium Bentonite
Work?
Sodium bentonite swells ****8 times its dry size when wetted by
water.
Over several years of testing, Sodium bentonite has proven to be
one of the most effective sealants on the market. The United States
E.P.A. has ruled that all landfills and waste disposal sites must
be lined to prevent the leaching of hazardous chemicals into the
existing ground water to protect the environment. The fact that
sodium bentonite swells many times its mass, then forms a strong
water and chemical proof seal makes it an ideal, inexpensive,
permanent, and easy to install liner. Sodium bentonite is
environmentally friendly and safe to use.
Differences in
"Bentonites"
There are several companies selling bentonite clay for various
markets. Some of these companies are misrepresenting their product
because the public they are selling to does not know the
difference.
We at Sturgis Materials are trying to educate the public on using
sodium bentonite as a pond sealant.
If you are considering using bentonite as a pond sealant, Please
read on!
1. There are two types of Bentonite clay.
   * One is a sodium bentonite. Sodium bentonite
has a natural swelling ability and will maintain its swelling
ability throughout its use.
   * The other is a calcium bentonite. Calcium
bentonite is a non-swelling bentonite. It will not swell without
additives or chemicals. Calcium bentonite enhanced with additives
will quickly lose its swell...It is short lived.
   * It is the swelling ability of the sodium
bentonite that enables this clay to bond with the soil to create an
impenetrable liner in the soil.
2. Bentonites are mined clays.
The quality of the bentonite deposits will vary. Some deposits of
Sodium Bentonite are very high quality swelling deposits, while
others are not as good. Some of the best deposits are deep in the
ground and will require many man-hours recovering this
bentonite.
So a good quality sodium bentonite begins with a good deposit!
Next, the processing of this clay plays a big part in the quality
of the end product.
All bentonites will contain a percentage of other minerals;
Aluminum Oxide, Potassium Oxide, Magnesium Oxide, to name a few and
a percentage of sand and silt. It is the process of removing the
sand and silt from the bentonite that will produce a higher quality
product. The process of removing most of the sand and silt takes
time and is costly.
Some companies are not interested in producing a quality product.
Thus they will use poor deposits of bentonite and process the
material quickly enabling them to sell their product at a cheaper
price. However, if this product were tested, it would probably
result in a large percentage of sand; something a leaky pond does
not need.
The key to using bentonite to seal a pond is:
   * Use a high quality sodium bentonite
   * Apply the product properly
   * Use the recommended amount based on your soil
type and      square footage of area
being treated.
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