Limestone-expanding clay granules and method of making them

Details Limestone-expanding clay granules and method of making them Limestone-expanding clay granules and method of making them

1974-12-20

1977-04-05

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

Inorganic material

71 64DA, 71 64SC, 423430, 106 52, C05D 302

Patent

active

040159736

ABSTRACT:
Limestone-expanding clay granules produced by charging a pulverizer and/or a mixer, with a raw material, which is high in calcium and/or magnesium, and an expanding clay binder, the expanding clay binder comprising from 1% and not more than 10% of the total charge. A portion of the material from the pulverizer is recycled back through the pulverizer, the amount recycled being determined by, among other things, the fineness of the raw material in the desired finished product. The remainder of the material from the pulverizer is caused to pass through a granulator, a dryer-cooler, and a finished product screen means. Fines from the finished product screen means are recycled directly to the pulverizer. Oversize material from the finished product screen is recycled to the pulverizer or to separate crusher and then back over the finished product screen means, where fines are removed and sent back to the pulverizer. When pulverizing is not required, the expanding clay binder is added to the raw material in the granulator along with the water, in slurry form, eliminating a separate mixing operation when the moisture content of the raw material is too high for the addition of the expanding clay binder in slurry form, it is either mixed in a high intensity mixer such as a cage mill or mixed in dry form in the granulator as the product is pelletized.

REFERENCES:
patent: 3214261 (1965-10-01), Galloway
patent: 3615811 (1971-10-01), Barrett
patent: 3630713 (1971-12-01), Adams
patent: 3692511 (1972-09-01), Wilson et al.

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