Aluminium Fluoride from fluorosilicic acid / (AlF3 low density)


Wet FSA process, first generation: production of aluminium fluoride by crystallization (Chemie-Linz Process)

FSA1G LBD-Aluminium fluoride from FSA

FSA1G Technologies based on FSA of the first generation (1G) known also as wet FSA process, wet AlF3 process from FSA or HF/fluorspar wet process and cryolite process also.

The first process known for manufacturing (LBD) aluminium fluoride from fluosilicic acid was patented by Chemie-Linz, Austria about 50 years ago and many plants were built based on this technology or comparable technologies.


H2SiF6 + Al2O3.3H2O → 2 AlF3 + 3 SiO2 + 4H2O

 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 its 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 few players only. Improvements are available from us for material of construction and cost-effective design, improved crystallisation process, product granulation, etc.

This process requires very pure FSA. Quality of the FSA is often a limitation to the use of FSA by this process.


FSA1G Flowsheet LBD-Aluminium fluoride from FSA, Wet FSA-based Process

 Plants built with this technology: JPMC, Alufluor, Lifosa, Ammophos, Alcoa, Luzhai, Guixi, Dayukou, Wengfu, Achinsk, Péchiney Salindres, Lubon, DMCC, Alufluoride, Navin, Hindalco, Spic, PT Petrokimia Gresik, AlQaim, Gomel, Trepca. (usual name) 



LD-AlF3-Typical Flowsheet