Sulfur/sodium bentonite mixtures as sulfur fertilizers. 1. The effects of S/Na-bentonite ratios on the rate of dispersion and particle size distribution of elemental sulfur dispersed from laboratory-produced prills |
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Authors: | C. C. Boswell W. R. Owers B. Swanney H. P. Rothbaum |
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Affiliation: | (1) Ministry of Agriculture and Fisheries, Invermay Agricultural Research Centre, Mosgiel, New Zealand;(2) Department of Scientific and Industrial Research, Industrial Processing Division, Lower Hutt, New Zealand;(3) Department of Scientific and Industrial Research, Chemistry Division, Lower Hutt, New Zealand |
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Abstract: | Sulfur/sodium bentonite fertilizer prills were made by blending between 5 and 40% by weight of a swelling sodium bentonite clay with molten sulfur (S) and chilling droplets of the mixtures in oil. The resulting prills were hard and dust free and thus offered a suitable form for elemental sulfur (S°) transportation and application. The prills were stable at normal room temperature and RH. Prill strength was much reduced by prolonged storage at 80% RH. With 15% or more bentonite the bulk resistivity was sufficiently low that no electrostatic charge build-up was likely and consequently there was little risk of spontaneous combustion.Prills containing 10% or more bentonite disintegrated when placed in water and both the rate of dispersion and the fineness of the dispersed S° particles increased bentonite content. Bentonite contents of 15–20% appeared to offer the best combination of rapid prill dispersion, fine dispersed S° particle size, and high S° content. |
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Keywords: | sulfur/sodium bentonite sulfur fertilizer particle size of sulfur elemental sulfur dispersion |
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