Abstract
A commercial attapulgite-type gelling clay was added as a conditioning-hardening agent to urea which was then tested as a substrate for sulfur coating. The coating tests were made in bench-scale batch equipment. The total coating weights and the 7-day dissolution rates of the sulfur-coated products were determined and compared with those from similar tests of previously made sulfur-coated urea products containing calcium lignosulfonate or formaldehyde. Compared with urea substrates containing formaldehyde, the urea containing attapulgite clay required about one-third less sulfur coating to attain the same 7-day dissolution rate. The urea containing attapulgite clay and the urea containing calcium lignosulfonate were about equally effective as substrates for sulfur coating.
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Gullett, L.L., Simmons, C.L. & Lee, R.G. Sulfur coating of urea treated with attapulgite clay. Fertilizer Research 28, 123–128 (1991). https://doi.org/10.1007/BF01048864
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DOI: https://doi.org/10.1007/BF01048864