Hydrofluoric Acid (HF) from fluorspar



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The process for manufacturing Hydrofluoric Acid is based on following reaction:

      CaF2 + H2SO4 2 HF + CaSO4

The process involves the following stages: Fluorspar drying, Sulphuric Acid manufacture from Sulphur, reaction of Fluorspar with Sulphuric Acid, Hydrofluoric Acid purification, scrubbing and by-product Calcium Sulphate neutralisation.
The reaction proceeds in a rotating furnace externally heated with natural gas or fuel. The furnace is equipped with pre-mixer and special internals to allow for optimized reaction time, quality and production rate to comply with requirements.






 HF distillation typical







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Optional Technical Features

- Non-pressurized distillation of AHF
- AHF safety storage (non pressurized tanks inside containment tank)
- HF dilution unit
- Arsenic removal unit
- Fluorspar drying
- Wastewater neutralization
- AHF Plants with Zero effluents

 Modeling and simulating HF reaction


- Multiphase system
- Electrolyte model, with activity coefficient calculation
- Solids, liquid entrainment
- Corrosion taken into account
- HF gas phase with species HF, (HF)2, (HF)3, (HF)4, (HF)5, (HF)6, (HF)7
- Species HSO3F, H2SIF6, all P species as POF3, PF5, all As species as AsF3, AsF5
- Material and heat balance
- Calculation of consumption figures of Fluorspar, Sulphuric acid and Oleum


HF gas polymers


Comparison of various fluorspar qualities and incidence on consumption and production cost


HF Reactor Simulation




HF from other raw materials


HF from MgF2 (data simulated and data from the literature, see below)






Possible routes to HF from other raw materials include UF6, Na3AlF6 (SPL & Natural), H2SiF6 (phosphate rock), fluorocarbons destruction, MgF2, etc...




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