Abstract SYMPHOS 2011

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at a considerable cost and the water recycled. Long term containment of this material also requires considerable resources, management, and potential environmental risks. In short, there is no overall “good home” for this material. The present primary outlets for FSA are fluoridation of drinking water, manufacturing Al-fluorides/Cryolite or flurosilicates. It only consumes a small fraction of the potential worldwide production volume. But these are low value added products and generate additional environmental issues. Our proposed technology has a very smart solution to convert the FSA into the value chain of “renewable green energy” and/ or of semiconductor industry without environmental discharge/liability issues associated with the phosphoric acid manufacturing plants. The technology “value adds” to the FSA stream and at the same time removes the environmental issues associated with it. It converts fluosilicic acid (FSA) to solar/electronic grade polysilicon without any detrimental environmental aspects. This high value technology process utilizes fluosilicic acid (FSA). The FSA when mixed with concentrated sulfuric acid breaks down in to STF, HF and water. The STF is scrubbed with sulfuric acid to remove any residual moisture, compressed and piped directly to the process for making polysilicon. The HF and water are absorbed by the concentrated sulfuric acid. This stream is recycled back to the phosphoric acid plant to be utilized in the phosphate rock reactors. The STF generated is further processed to produce high purity electronic grade silane and polysilicon. Parts of this process are practiced by many major polysilicon and silane manufacturers. The major steps for the process are, FSA to STF, STF to SILANE – SILANE purification – SILANE to POLYSILICON, for solar/electronic applications. Major aspects of the technology will be discussed along with its inherent advantages. 56 TAILOR MADE SCREENING TECHNOLOGY FOR DIFFERENT SCREENING TASKS IN THE PHOSPHATE PROCESSING INDUSTRY PH-O-07 Oliver Pikhard Dipl.-Ing. Sigurd Schuetz, Dipl.-Ing. Dietmar Koch, Dipl.-Ing. , RHEWUM GMbH, Remscheid/GERMANY The paper will present an overview of specific requirements of the phosphate industry on screening processes and technology and in which way they can be met by choosing the right screening technology. The investment costs for the classification of phosphate products are relatively small compared to the total investment costs. On the other hand the financial impact of the wrong screen type, mesh or anti-clogging device on the production can be high compared to the investment costs of a screen. Due to numerous developments in screening machines it becomes ever more important for the plant operator to decide in favour of the best available technique. The choice of the right screening technology is influenced by various parameters - some basic facts on screening will be presented as well as different types of screening machines to demonstrate the way to deciding for the best available technique.
Combination of inclined screen with direct agitation of screen cloth and linear motion screen type MDS COMPARISON OF PHOSPHORIC ACID PRODUCTION PROCESSES Donal S. Tunks Process Engineer, Jacobs Engineering S.A. (JESA) 3-D-Model of a linear motion screening machine Type MDS, delivered to the fertilizer industry PH-O-08 Over the years, many different Phosphoric Acid Processes have been developed, some of which have fallen out of use and others have not yet been fully developed. This paper will present the underlying economics behind several different routes to phosphoric production. The paper is based on generic processes for each of the routes rather than processes offered by specific licensors. The Phosphoric Acid Production Processes that will be analyzed are as follows: • Dihydrate Process • Hemihydrate Process • Hemi-Dihydrate Process • Di-Hemihydrate Process • Hemi-Dihydrate Recrystallization Process • Thermal Process • Furnace Process • Nitrophosphate Process • Hydrochloric Acid Route The total installed cost of a new facility, cost of raw materials, cost of waste disposal, utilities consumption, and 57
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Dear participants, On behalf of the
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EXTRACTION Mansour ASRI, Chercheur
Page 7: PLENARY LECTURES KEYNOTES MINING PH
Page 10 and 11: 10 L’INNOVATION TECHNOLOGIQUE DAN
Page 12 and 13: NANOSTRUCTURE PROCESSING OF ADVANCE
Page 15 and 16: II - KEYNOTES 15
Page 17 and 18: LES MÉTHODES GÉOPHYSIQUES DE SUBS
Page 19 and 20: LES PHOSPHATES, LE LITHIUM ET LE ST
Page 21 and 22: material engineering concepts can b
Page 23 and 24: PHOSPHATE FERTILIZER PRODUCTION FRO
Page 25 and 26: ENVIRONMENTAL ISSUES The plants tha
Page 27: FOOD SECURITY AND THE ROLE OF FERTI
Page 30 and 31: 30 CONCEPTION ET RÉALISATION DES T
Page 32 and 33: LE SURFACE MINING: UN STANDARD INTE
Page 34 and 35: 34 LA STRATIGRAPHIE SEQUENTIELLE OU
Page 36 and 37: - Calcul de Ressources et Étude É
Page 38 and 39: 38 I
Page 40 and 41: 40 BENEFICIATION OF INDIAN LOW GRAD
Page 42 and 43: 42 Johan SIIRAK, AkzoNobel Surface
Page 44 and 45: Pour améliorer davantage la qualit
Page 46 and 47: Results REE elements recovery is ex
Page 48 and 49: 48 Marie VOGNSEN HALDOR TOPSOE A/S,
Page 50 and 51: This contribution gives an overview
Page 52 and 53: 52 Marten WALTERS KEMWorks Technolo
Page 54 and 55: PH-O-04 B. Messnaoui : Laboratoire
Page 58 and 59: phosphate recovery will be determin
Page 60 and 61: The residence time of product in a
Page 62 and 63: 62 IMPROVING PHOSPHORUS USE EFFICIE
Page 64 and 65: PH-O-16 Todd Hutchinson Director of
Page 66 and 67: Wet process phosphoric acid is fed
Page 68 and 69: 68 Louis Paul Irwin, ArrMaz Custom
Page 70 and 71: 70 FLUOROSILICIC ACID RECOVERY FROM
Page 73 and 74: VII - ENVIRONMENT & SUSTAINABLE DEV
Page 75 and 76: infiuence, 2 - average, 1 - less es
Page 77 and 78: downstream weir at the end of the p
Page 79 and 80: Pascale Compain Bertin Technologies
Page 81 and 82: WATER MANAGEMENT IN PHOSPHORIC ACID
Page 83 and 84: Suppression of plumes at the exhaus
Page 85 and 86: key pollutants including heavy meta
Page 87 and 88: VIII - INDUSTRIAL MANAGEMENT 87
Page 89 and 90: BELGHITI ALAOUI Mohamed OCP, MOROCC
Page 91 and 92: IX - MATERIALS & NEW PRODUCTS 91
Page 93 and 94: • La supervision des réparations
Page 95 and 96: FLUORINE RECOVERY TECHNOLOGY (INTRO
Page 97 and 98: HCl regeneration CaCl 2 + H 2 SO 4
Page 99 and 100: proposées comme la télomérisatio
Page 101 and 102: PRODUCTION OF GRANULAR AMMONIUM SUL
Page 103 and 104: X - POSTERS 103
Page 105 and 106: La série phosphatée étudiée s
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A SIMULATION PACKAGE FOR THE PHOSPH
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FABRICATION DES SUPERPHOSPHATES SSP
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LA SILICIFICATION DES PHOSPHATES MA
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ANALYSIS OF THE LIKELY SUPPLY SIDE
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Many REE are well known as luminesc
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OPERATION OF SURFACE MINER: RETROSP
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Harris Jack, President, VIP Interna
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D.Oussi OCP - MAROC PROJET DE RENOU
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XI - WORKSHOPS 123
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De par ses activités dans le secte
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Re-cyrstalllized structure of a cry
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Pour les professionnels : - les eng
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Pour des engrais de forme aplatie o
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Coatings The underlying principle o
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HOW IS BINDING ACHIEVED? Trace Elem
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MODÉLISATION THERMOCINÉTIQUE DES
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Garret Palmquist (MECS-DuPont), Sen
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The ideas emerged from looking at h
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PH-O-25 ...........................
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Abstract SYMPHOS 2011

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