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US 4,227,920 AGranted
Methods of clay benefication
AssigneeYara Engineering Corporation
InventorsJohn H. Chapman, David Anderson
Life of this patent
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Abstract
A method of beneficiating highly discolored clays to produce a clay of acceptable quality to the paper industry is provided by passing a deflocculated clay suspension through a high intensity magnetic separator, thereafter selectively flocculating the clay from the suspension and recovering the flocculated clay be removing the supernatant liquid.
Claims13
A method of beneficiating highly discolored clays to produce a clay of acceptable quality to the paper industry comprising the steps of:
- a. forming an aqueous suspension of a clay to be beneficiated,
- b. deflocculating said aqueous clay suspension,
- c. first, passing said deflocculated clay suspension through a high intensity magnetic separator,
- d. further deflocculating said clay after passing through said magnetic separator,
- e. second, selectively flocculating the clay from the suspension after it has passed through said high intensity magnetic separator,
- f. removing the supernatant liquid from the flocculated clay, and
- g. recovering a clay of improved whiteness and brightness from said selectively flocculated clay.
4 more elements
Dependencies are inferred from the claim text.