Method for preparing particulate zinc oxide shapes of high surface area and improved strength
AssigneeThe New Jersey Zinc Company
InventorVictor S. Robinson
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Abstract
Particulate zinc oxide shaped of high surface area and improved crushing strength are prepared without extraneous binder by a process including forming normal surface area zinc oxide into shapes without binder, converting at least a portion of the zinc oxide to basic zinc carbonate by exposing the shapes in the presence of moisture, to a carbon dioxide-containing atmosphere and effecting substantially complete decomposition of the basic zinc carbonate. Conditions of bulk density, moisture content and temperature are controlled.
Claims9
A process for producing high surface area and high crush strength particulate zinc oxide shapes, said process comprising:
- a. forming normal zinc oxide having a specific surface area less than 10 square meters per gram into pre-determined shapes without the addition of extraneous binding material;
- b. exposing said normal zinc oxide shapes to a carbon dioxide-containing atmosphere including water vapor;
- c. converting at least about 45% of said zinc oxide into basic zinc carbonate;
- and
- d. decomposing substantially all of said basic zinc carbonate into particulate zinc oxide shapes.
Dependencies are inferred from the claim text.