A series of silane-containing polymers with specific characteristics has been developed for complete elimination of sodalite scale in Bayer process. With practical dosages of those reagents effective protection against scale has been demonstrated in an alumina pilot plant and subsequently in several production plants. No negative effects were observed on the throughput as well as the quality of alumina produced with the use of those reagents. It is believed that the reagents are adsorbed onto red mud solids and are removed subsequently with red mud in filtration step. A possible mechanism of scale inhibition by the reagents was proposed.

Subject
Digesters, Test methods, Heaters, Liquor, Tubes, Scale inhibitors, Silica, Heat exchangers, Reagents, Scale formation, Heat, Scale, Steam
Keywords:
Bayer process, alumina, bauxite, sodium aluminosilicate, sodalite scale, scale inhibition, antiscalants, silane-containing polymers, heat exchangers
© 2007 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2007
Association for Materials Protection and Performance (AMPP)
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