- Phosphatic clay are
Very small particles that are separated from phosphate ore less than
140 mesh. It consists of a mixture of very fine phosphate rock
particles and naturallyoccurring clay minerals it can be
Concentrated but not created or chemically altered by processing of
- The phosphatic clay
resource is a by-product of phosphate mining in central Florida.
This resource currently occupies approximately 100,000 acres
- The clay in the ponds
came out of the ground as part of the matrix, which naturally
contains the radioactive elements uranium and radium. Some of this
radioactivity ends up going to the clay ponds.
- Phosphatic clay
sediment in the ponds have a higher level of radioactivity than
sediment in natural lakes, but the water is like other lake water.
When the pond settles the soil has higher levels of radioactivity
than normal soil.
- Characteristics of
Phosphatic Clay are (i) Very high fertility (ii) Very high retention
capacity for moisture and applied nutrients (iii) Drainage can be a
problem (iv) Tillage characteristics similar to other heavy clay
- Reclaimed soils and
phosphatic clays can successfully produce agricultural crops. In
many instances water retention are better in reclaimed versus native
- A 2 to 3 year cropping
system consisting of legumes or other green manure crops augments
organic matter and physical characteristics of the soil.
- Two primary factors
can be addressed by the grower before tillage of phosphatic clay.
The primary factor controlling clod size is soil moisture within the
depth of soil to be tilled. Wetter soil conditions will result in
larger clods. Dryer soil conditions during tillage will produce
smaller clods. In the case of phosphatic clay, soil moisture should
be a major consideration in deciding if and when to till.
- Phosphatic clay, a
waste by-product of the phosphate mining industry, used as an
effective sorbent for Pb from aqueous effluents. The major
parameters controlling aqueous Pb removal, viz. initial metal ion
concentrations, solution pH, sorbent amounts, ionic strength and
presence of both inorganic and organic ligands were evaluated using
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