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Written by Administrator
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Thursday, 17 September 2009 22:45 |
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Many ponds on a variety of soil types are prone to water loss by seepage. This water loss can be controlled by the application of western sodium bentonite clay. Sodium bentonite is a naturally occurring clay which contains no additives.
Sodium bentonite clay swells up to12 times its dry size when it becomes wet. Bentonite is environmentally safe and does not affect the water, livestock or wildlife. When properly applied it will not harm fish. Bentonite is easily applied. In the case of small ponds, it can be applied with simple hand tools and, for larger ponds, with ordinary farm equipment. Blanket method  The blanket method can be used in new pond construction and in existing ponds that can be drained. This is usually the most effective method to control water loss. However, more care is required during the application process.
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Bentonite Mining & Processing Technology |
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Written by Administrator
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Thursday, 17 September 2009 22:22 |
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Bentonite deposits are normally exploited by quarrying. Extracted bentonite is distinctly solid, even with a high moisture content of approximately 30%. The material is initially crushed and, if necessary, activated with the addition of soda ash (Na2CO3). Bentonite is subsequently dried (air and/or forced drying) to reach the moisture content of approximately 15%.
According to the final application, bentonite is either sieved (granular form) or milled (into powder and superfine powder form). For special applications, bentonite is purified by removing the associated gangue minerals, or treated with acids to produce acid activated bentonite (bleaching earths), or treated with organics to produce organoclays. 
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PERMAFROST and ACID ROCK DRAINAGE |
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Written by Administrator
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Thursday, 27 August 2009 07:52 |
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By Bruce W. Downing, M.Sc., P.Geo. PERMAFROST: Layers of soil in which a temperature below freezing exists continuously. Acid rock drainage has become a major topic with respect to mining and the environment in the permafrost regions of Canada. This essentially has become very important in the recent mine development review of the potential diamond mines in northern Canada. Natural acid rock generation and drainage professes resulting in natural gossan development is very slow in permafrost areas. Some rocks may be quite permeable, such as kimberlites and hence water movement will occur through these kimberlite bodies, even though they may occur within permafrost areas. The studies of ARD and its impact upon the permafrost environment have become quite noticeable within the last five years. |
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Last Updated on Thursday, 17 September 2009 22:36 |
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