Abstract SYMPHOS 2011

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100 MANUFACTURE OF HIGH-BULK DENSITY ALUMINIUM FLUORIDE FROM FLUOSILICIC ACID Alain Dreveton, AD Process Strategies Sarl, Rue Chaponnière 9, CH-1201 Geneva / SWITZERLAND AP-O-12 Fuosilicic acid finds its main application in the manufacture of aluminium fluoride being a large volume chemical mostly produced from fluorspar as high bulk density (HBD) aluminium fluoride and as well from fluosilicic acid as low bulk density (LBD) aluminium fluoride. Hereby is disclosed new processes for manufacturing anhydrous hydrofluoric acid (AHF) from fluosilicic acid (FSA) from which (HBD) aluminium fluoride can be produced. Aluminium fluoride is essentially used as a flux for smelting aluminium by adding it volumetrically to the cells of aluminium smelters in order to regenerate the cryolite bath. HBD aluminium fluoride is the preferred material and it is fully produced from fluorspar; none of this material being currently produced from FSA through AHF which process technology often referred to as the Dry/FSA Process is available, feasible and proven at this time. An opportunity to invest in profitable projects is really existing. Additionally the manufacture of other downstream products of HF: refrigerants, fluoropolymers, etc and downstream products of FSA: silicon metal, silicon tetrafluoride, silicas may offer extra opportunities. The first process known for manufacturing (LBD) aluminium fluoride from fluosilicic acid was patented by Chemie- Linz, Austria and many plants were built based on this technology or similar technologies. This process uses the direct neutralization of the fluosilicic acid with alumina hydroxide in a stirred reactor. It is often referred to as the Wet/FSA Process. Although this technology tends to be abandoned due to the low density and low fluidity (flowability) of the product, the high capital cost of the plant and environmental issues resolved partially only as neutralization of mother liquors may still be required, further developments of this process would refresh this technology being still accepted by very few players only. A process to produce AHF / HF from fluosilicic acid was disclosed first by Tennessee Corp., USA and further by Wellmann-Lord, etc and more lately by Flemmert (Sweden), and Lubon Works, Poland who operated a small pilot plant. More recently Wengfu, China built a first commercial plant with the technology of Buss Chemtech AG, Switzerland based on know-how from Lubon Works. The process is based on the mixing of strong fluosilicic acid with strong sulphuric in a stirred reactor and separating silicon tetrafluoride and extracting the anhydrous hydrofluoric acid using separation columns. Presently AD Process Strategies Sarl proposes a similar type of process with major improvements completed to suit the water balance of the phosphoric acid plant; sulphuric acid containing water that is generated from this HF plant has to be recirculated to the phosphoric acid plant. The technology is proven, resolves environmental issues, is very profitable as raw material costs are low, capital cost is reasonable and it offers access to promising markets for HBD aluminium fluoride and anhydrous hydrofluoric acid, both being large volume chemicals. For situations described above when the diluted sulphuric acid stream is not returned to the phosphoric acid plant or can not be recirculated due to technically reasons or not, AD Process Strategies Sarl proposes a new technology for stand alone HF plants. The proposed process uses fluosilicate as intermediate raw material, which is transportable not like FSA and reaction of fluosilicate with sulphuric acid. The silicon tetrafluoride and hydrofluoric acid obtained is treated as per the state of art mentioned above. The diluted sulphuric acid stream from this process can be preconcentrated and recycled to the phosphoric acid plant or used in production of fertilizers, concentrated and recycled to the HF reaction or purified and sold. These technologies are offering high flexibility and can be implemented with confidence in a cost effective manner. They are real innovations for the fertilizer industry and surely they will be implemented progressively. More and more projects are under study and hopefully some projects may be executed in the near future….
PRODUCTION OF GRANULAR AMMONIUM SULFATE FROM PHOSPHOGYPSUM Bangjie Zhao Deputy Manager of Wengfu MAP Plant, Wengfu (Group) Co., Ltd., Guiyang City, CHINA AP-O-13 The Handling of phosphogypsum is a common problem in the phosphate industry worldwide. Most countries adopt the method of stacking, Wengfu (Group) Co., Ltd. has developed a technology and is now constructing a facility to use phosphogypsum, carbon dioxide from the production of synthetic ammonia, and ammonia as raw materials to produce granular ammonium sulfate and lime powder. This process helps to reduces environment pollution and ensure the optimum utilisation of phosphogypsum and carbon dioxide. 101
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Dear participants, On behalf of the
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EXTRACTION Mansour ASRI, Chercheur
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PLENARY LECTURES KEYNOTES MINING PH
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10 L’INNOVATION TECHNOLOGIQUE DAN
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NANOSTRUCTURE PROCESSING OF ADVANCE
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II - KEYNOTES 15
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LES MÉTHODES GÉOPHYSIQUES DE SUBS
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LES PHOSPHATES, LE LITHIUM ET LE ST
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material engineering concepts can b
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PHOSPHATE FERTILIZER PRODUCTION FRO
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ENVIRONMENTAL ISSUES The plants tha
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FOOD SECURITY AND THE ROLE OF FERTI
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30 CONCEPTION ET RÉALISATION DES T
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LE SURFACE MINING: UN STANDARD INTE
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34 LA STRATIGRAPHIE SEQUENTIELLE OU
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- Calcul de Ressources et Étude É
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38 I
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40 BENEFICIATION OF INDIAN LOW GRAD
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42 Johan SIIRAK, AkzoNobel Surface
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Pour améliorer davantage la qualit
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Results REE elements recovery is ex
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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 56 and 57: at a considerable cost and the wate
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: proposées comme la télomérisatio
Page 103 and 104: X - POSTERS 103
Page 105 and 106: La série phosphatée étudiée s
Page 107 and 108: A SIMULATION PACKAGE FOR THE PHOSPH
Page 109 and 110: FABRICATION DES SUPERPHOSPHATES SSP
Page 111 and 112: LA SILICIFICATION DES PHOSPHATES MA
Page 113 and 114: ANALYSIS OF THE LIKELY SUPPLY SIDE
Page 115 and 116: Many REE are well known as luminesc
Page 117 and 118: OPERATION OF SURFACE MINER: RETROSP
Page 119 and 120: Harris Jack, President, VIP Interna
Page 121 and 122: D.Oussi OCP - MAROC PROJET DE RENOU
Page 123 and 124: XI - WORKSHOPS 123
Page 125 and 126: De par ses activités dans le secte
Page 127 and 128: Re-cyrstalllized structure of a cry
Page 129 and 130: Pour les professionnels : - les eng
Page 131 and 132: Pour des engrais de forme aplatie o
Page 133 and 134: Coatings The underlying principle o
Page 135 and 136: HOW IS BINDING ACHIEVED? Trace Elem
Page 137 and 138: MODÉLISATION THERMOCINÉTIQUE DES
Page 139 and 140: Garret Palmquist (MECS-DuPont), Sen
Page 141 and 142: The ideas emerged from looking at h
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Page 145 and 146: PH-O-25 ...........................
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Abstract SYMPHOS 2011

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