Hydrofluoric Acid (HF) from fluorspar

 

FLUORSPAR (CaF2) PROCESS  

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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.

 

 

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 HF distillation typical

 

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PICT1241

 


 

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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)

 

MgF2-H2SO4-Reaction

 

MgF2-H2SO4-Reaction-after-LA-12909-MS

 

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

 


 

 

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