Process for fluidifying aqueous suspensions of red muds in the production of alumina by the bayer process
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United States of America Patent
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Aug 5, 1997
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N/A
app pub date -
Jul 14, 1994
filing date -
Jul 29, 1993
priority date (Note) -
Expired
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Abstract
Improved process for fluidifying flocculated aqueous suspensions of red muds in the production of alumina from bauxite by the Bayer process, which consists: in dissolving bauxite using sodium hydroxide; then, in decanting and in washing the red muds formed in order to separate them from the alumina in successive vats, while recycling the washing waters upstream; and finally, in eliminating the red muds thus treated; and in which a flocculant (F) consisting of a polyacrylamide of molecular weight greater than ten million is introduced into the suspension of one of the successive vats; wherein a dispersing agent (D) formed by an anionic acrylic acid polymer of molecular weight lower than fifty thousand is added simultaneously with said flocculant (F) to the suspension in the same vat.
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