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Fluorine Technology

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Fluorine Technology FLUORINE TECHNOLOGY HIGH BULK DENSITY ALUMINIUM FLUORIDE FROM FLUOROSILICIC ACID Buss ChemTech is recognized as the RANGE OF SERVICES AHF SAFETY STORAGE world leading technology supplier for ■■ Conceptual design The storage system consists of AHF Storage fluorine chemicals. ■■ Feasibility studies and plant assessments Tanks within the AHF Storage Containment ■■ Basic and detail engineering Tank, stored at a low temperature and at at- We are able to offer our clients guaranteed ■■ Process automation mospheric pressure. operating plants: ■■ Materials or total plant supply ■■ Project management, Aluminum fluoride is used by aluminum produc- ■■ Commissioning and start-up ers to lower the melting point of electrolytes in ■■ After sales service the smelting process and increase production efficiency. AHF PLANT Concentrated fluosilicic acid is decomposed in Our process technology for fluorine chemicals the presence of sulphuric acid according to the is the result of over fifty years of continuous following reaction: development linked to direct experience of the design and construction of industrial scale H2SiF6+SiF4(aq)+H2SO4 → plants. 2SiF4(g)+2HF(g)+H2SO4(aq) THIS RESULTS IN The reaction produces silicon tetrafluoride gas ■■ Plant capacities and products specifications and hydrogen fluoride. The latter remaining tailored to your requirements mainly absorbed in the sulphuric acid. AHF Storage, Gulf Fluor, Abu Dhabi ■■ Critical equipment like the AlF3 Reactor manufactured to strictly controlled specifi- This acid is distilled to produce hydrofluoric acid. ALUMINIUM HYDROXIDE DRYING cations PLANT ■■ Prolonged plant life and high productivity The by-product sulphuric acid is dilute at a con- Aluminium hydroxide is delivered to the plant centration of 70% to 75%. This acid is pumped complex as a wet cake. Drying is carried out in back to the phosphoric acid plant to be fed to a flash dryer before transport to the respective the reaction system. user. Silicon tetrafluoride gas is cleaned in absorption ALF3 PLANT columns to remove hydrogen fluoride and flows Aluminium fluoride is produced by reacting forward to the silicon tetrafluoride concentra- dried aluminium hydroxide with the hydrofluoric tion system where it is absorbed in fluorosilicic acid gas in a fluidized bed reactor. acid feed stock. The reaction can be summarized as follows: SiF4 gas is absorbed and reacts according to the following overall exothermic reaction: Al(OH)3 + 3 HF →AlF3 + 3 H2O 5SiF4+2H2O →2H2SiF6+2SiF4+SiO2(Hydrate) Al(OH)3 is transported to the Al(OH)3 Silo from where it is fed into the AlF3 Reactor. A by-product of this system is silica. Vent gas from the silicon tetrafluoride concentration sys- AHF is evaporated and superheated and fed to tem flows to the Central Absorption System the lower bed of the reactor. before emission to the atmosphere. Aluminium fluoride is fed from the lower bed of the reactor through a product cooler to storage. AHF Plant: Capacity 10,000 MTPY; Fujian Wengfu Lantian, Hubei, PRC FLUORINE TECHNOLOGY HIGH BULK DENSITY ALUMINIUM FLUORIDE FROM FLUOROSILICIC ACID AlF3 Plant; Capacity 60,000 MTPY Gulf Fluor, Abu Dhabi Tail gases from the process flow to the Central ■■ white free-flowing solid Absorption Section. ■■ Bulk Density 1500 kg/m3 ■■ Flowability Index <60 seconds for 1 kg Aluminium fluoride product is fed to bulk trans- ■■ L.O.I. (One hour at 550°C) 0.5% wt max. port tankers or bag filling plant. ■■ Granular size < 45 µm 10% max. ■■ Granular size > 150 µm 3% max. Fine solids transported out of the AlF3 Reactor with the gas stream are recovered in cyclones EXPECTED CONSUMPTION FIGURES and solids from them flow to the product stream. Raw Materials (per metric ton of aluminium fluoride) KEY FEATURES Fluorosilicic acid 1,080 kg ■■ High quality aluminium fluoride Sulphuric Acid 21,000 kg ■■ Reliability in operation Aluminium hydroxide 1,030 kg ■■ Environment and high safety record (calculated as 100% wt AI(OH)3 ■■ Use of fluorosilicic acid containing high impurity levels Utilities for AHF and AlF3 Plant EXPECTED PRODUCT SPECIFICATION (per metric ton of aluminium fluoride) (per metric ton of aluminium fluoride) Steam, Low Pressure 0,265 GJ AlF3 91 % wt. min Steam, Medium Pressure 0,87 GJ 3 SO4- 0.004 % wt. max Process water 4 m SiO2 0.025 % wt. max Cooling water 22,7 GJ P2O5 0.005 % wt. max Chilled water 5,7 GJ Fe2O3 0.020 % wt. max Electricity 315 kWh Na2O 0,050 % wt. max Fuel 0,36 GJ FL/030/1-17 www.buss-ct.com BUSS ChemTech AG | Hohenrainstrasse 12A | 4133 Pratteln 1 | Switzerland | Tel. +41 61 825 64 62 | Fax +41 61 825 67 37 | [email protected] .
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