Solid state reactions with MgCO.sub.3 /MgOH
AssigneeE.C.C. America Inc.
InventorCamilla A. Rice
Life of this patent
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Abstract
In the method for producing a low abrasion calcined kaolin clay pigment by providing a feed kaolin which is at least sufficiently fine that substantially 100% by weight of the particles are of less than 1 micrometer E.S.D., and heating said feed in a calciner to a temperature of at least 900.degree. C., and under conditions such that substantially none of said kaolin is heated to a temperature in excess of 1100.degree. C.; a reduction in the abrasivity of the calcined product is achieved by incorporating into the feed from 1 to 4% by weight of MgCO.sub.3 and/or Mg(OH).sub.2.
Claims8
In the method for producing a low abrasion calcined kaolin clay pigment by providing a feed kaolin which is at least sufficiently fine that substantially 100% by weight of the particles are of less than 1 micrometer E.S.D., and heating said feed in a calciner to a temperature of at least 900.degree. C., and under conditions such that substantially none of said kaolin is heated to a temperature in excess of 1100.degree. C.;
- the improvement enabling a reduction in the abrasivity of the calcined product comprising:
- incorporating into the said feed from 1 to 4% by weight of an abrasion-reducing agent selected from one or more members of the group consisting of MgCO.sub.3 and
Dependencies are inferred from the claim text.