Abstract SYMPHOS 2011

138
- Optimiser la conduite des procédés de valorisation des phosphates par voie humide, notamment au
niveau de la réaction, tout en introduisant un outil numérique fiable et performant pour le calcul des
réacteurs de lixiviation des phosphates ;
- Développer d’autres procédés de valorisation de phosphates minéraux beaucoup plus performants
ou contribuer à l’amélioration des procédés existants. En effet, la compréhension des phénomènes
mis en jeux lors de l’attaque des phosphates permet aux chercheurs et aux ingénieurs d’optimiser
les paramètres opératoires ainsi que les conditions physicochimiques et donc les procédés dans leur
globalité.
NEW BOLT-ON TECHNOLOGIES FOR SCALE CONTROL AND METALS REMOVAL
IN PHOSPHORIC ACID PRODUCTION
WS5 - 4
SA.Ravishankar & Ahmet TEOMAN, Bing Wang, John Carr and Rajesh Raitani
Cytec Industries Inc., 1937 West Main Street, Stamford CT 06902 USA
Strong demand in biofuels crop, food and feeds, the recovery in fertilizer use is likely to hit a new demand-driven
cycle for phosphoric acid with an average of 4.5% increase in consumption in the next 4-5 years. However,
increasing energy prices, regulatory pressures and growing environmental concerns, pose major constraints
to capacity growth. The purpose of this paper is to discuss two technologies developed by Cytec recently on
fluorosilicate scale control and metals removal in phosphoric acid production. In scale control, a new anti-scalant
chemical additive has been developed and demonstrated at plant level for preventing scale formed as a result of
cooling in long pipelines transporting 28% P2O5 phosphoric acid. And, with metals removal, several plant trials
and lab results will be discussed with special reference to removing Cd and As metals from Phosphoric acid. One of
the most salient features of these technologies is their “bolt-on” nature which substantially minimizes the capital
investment with no downstream effects.