High Bulk Density Aluminium Fluoride from Hydrofluoric Acid from Fluorspar

FLUORINE TECHNOLOGY

HIGH BULK DENSITY ALUMINIUM FLUORIDE FROM HYDROFLUORIC ACID FROM FLUORSPAR

Buss ChemTech is recognized as the world leading technology supplier for fluorine chemicals.

We are able to offer our clients guaranteed operating plants:

Aluminum fluoride is used by aluminum pro- ducers to lower the melting point of electrolytes in the smelting process and increase production efficiency. Our process technology for fluorine chemicals is the result of over fifty years of continuous development linked to direct experience of the design and construction of industrial scale plants. THIS RESULTS IN ■■ Plant capacities and products specifications tailored to your requirements

■■ Critical equipment like the AlF3 Reactor manufactured to strictly controlled specifi- AHF Plant; Capacity 60,000 MTPY; Gulf Fluor, Abu Dhabi cations 3 ■■ Prolonged plant life and high productivity AHF PLANT RANGE OF SERVICES Hydrogen fluoride is produced by the reaction of Tail gases flow to the Central Absorption Sec- ■■ Fluorspar reactivity tests sulphuric acid with fluorspar in the Prereactor tion before emission to atmosphere. ■■ Conceptual design and this reaction is completed in an indirectly ■■ Feasibility studies and plant assessments heated rotary kiln. AHF SAFETY STORAGE ■■ Basic and detail engineering The storage system consists of AHF Storage ■■ Process automation The reaction can be represented by the follow- Tanks within the AHF Storage Containment ■■ Materials or total plant supply ing equation: Tank at a low temperature and atmospheric ■■ Project management, pressure.

■■ Commissioning and start-up CaF2+H2SO4 ➝CaSO4+2HF ■■ After sales service Dry fluorspar, oleum and sulphuric acid flow to FLUORSPAR AND ALUMINIUM the Prereactor where the reaction begins and is HYDROXIDE DRYING PLANTS completed in a rotary kiln. Fluorspar and aluminium hydroxide are deliv- ered to the plant complex as a wet cake. Drying Hydrogen fluoride flows through gas cleaning is carried out in flash dryers before transport to equipment, is condensed and distilled to pro- the respective user. duce anhydrous hydrofluoric acid.

Solid calcium sulphate residues are removed from the HF Reactor, neutralised and is sold HF Storage, Sao Paulo Brazil to the building industry for use as floor levelling material, building blocks and as retarder in the cement industry. FLUORINE TECHNOLOGY HIGH BULK DENSITY ALUMINIUM FLUORIDE FROM HYDROFLUORIC ACID FROM FLUORSPAR

ALF3 PLANT KEY FEATURES EXPECTED CONSUMPTION FIGURES Aluminium fluoride is produced by reacting ■■ High quality aluminium fluoride dried aluminium hydroxide with the hydrofluoric ■■ Reliability in operation Raw Materials acid gas in a fluidized bed reactor. ■■ Environment and high safety record (per metric ton of aluminium fluoride) The reaction can be summarized as follows: ■■ Use of fluorspar containing high impurity Fluorspar 1540 kg levels Sulphuric acid / oleum 1850 kg

Al(OH)3 + 3 HF →AlF3 + 3 H2O ■■ Sale of anhydrite as building raw material (calculated as 100% H2SO4) Aluminium hydroxide 1030 kg

Al(OH)3 is conveyed to the Al(OH)3 Silo from EXPECTED PRODUCT SPECIFICATION (calculated as 100% wt Al(OH)3 where it is fed into the AlF3 Reactor. (per metric ton of aluminium fluoride) Calcium hydroxide 30 kg AIF3 91 % wt. min AHF is evaporated and superheated and fed to SO 0.004 % wt. max 4 Utilities for AHF/AIF Plant the lower bed of the reactor. SiO 0.025 % wt. max 3 2 (per metric ton of aluminium fluoride) P O 0.005 % wt. max 2 5 Steam, Low Pressure 0,8 GJ Aluminium fluoride is fed from the lower bed of Fe O 0.020 % wt. max 2 3 Steam, Medium Pressure 1,3 GJ the reactor through a product cooler to storage. Na O 0.050 % wt. max 2 Process water 3 m3

Fine solids transported out of the AlF3 Reactor ■■ white free-flowing solid Cooling water 3,6 GJ with the gas stream are recovered in cyclones ■■ Bulk Density 1500 kg/m3 Chilled water 1.7 GJ and solids from them flow to the product ■■ Flowability Index <60 seconds for 1 kg Electricity 215 kWh stream. ■■ L.O.I. (one hour at 550°C) 0.5% wt max. Fuel 4.9 GJ ■■ Granular size < 45 µm 10% max. This includes HF production per metric ton of aluminium fluoride Tail gases from the process flow to the Central ■■ Granular size > 150 µm 3% max. Absorption Section.

Aluminium fluoride product is fed to bulk transport tankers or bag filling plant.

AlF3 Plant; Capacity 60,000 MTPY Gulf Fluor, Abu Dhabi

FL/040/1-17 www.buss-ct.com