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    Production of elemental sulfur and bentonite clay granules in a rotary drum

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    Hamilton_mines_0052N_10091.pdf
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    Description:
    Production of elemental sulfur ...
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    Author
    Hamilton, Ian
    Advisor
    Ayers, Reed A.
    Date issued
    2013
    Keywords
    sulfur
    fertilizer
    bentonite
    Bentonite
    Fertilizers -- Research
    Sulfur fertilizers
    
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    URI
    https://hdl.handle.net/11124/78756
    Abstract
    Biological oxidation of sulfur granules is a critical component in elemental sulfur fertilizers since it converts sulfur to plant available sulfate. The level of biological oxidation is, in turn, regulated by the size and surface area of the sulfur granules. The aim of this research was to produce coarse sulfur granules that disintegrate to the correct particle size for biological oxidation, as well as the correct size for ballistic distribution from a spreader. Thus the interaction between mineral powders such as serpentine rock was investigated to get a better understanding of how these types of minerals react at different size fractions in granulation. Sulfur granules were developed from mixtures of 10% sodium bentonite clay with molten elemental sulfur. This was accomplished by sprayed a mixture bentonite and elemental sulfur into a falling curtain of fine material powder within a rotating drum. When comparing the seed materials, the serpentine rock showed sufficiently lower electrostatic build-up than phosphate rock. Serpentine rock also appears to help facilitate the disintegration of the granules when they are exposed to water. The outcome of the research was that it is possible to make a granulated sulfur fertilizer that had the correct size fraction and disintegration characteristics suitable for agronomic use.
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