Strategic Fluorine Chemistry
USGS & EU Critical Mineral
Clean-Tech Precursor
Fluorspar Refining & Hydrofluoric Acid Lab
Model run-of-mine fluorspar flotation to acidspar (), rotary reaction kiln HF generation (), semiconductor electronic-grade HF (UP-SS / PPT), EV battery electrolytes, PVDF binders, and synthetic anhydrite byproduct circularity.
Plant Scenarios:
Re-evaluates 20-year DCF, mass stoichiometry, and downstream fluorochemical yields in real-time.
Annual Revenue
$124.50M
AHF, eHF, LiPF6 & Anhydrite
Annual EBITDA
$48.20M
Cash operating margin
Project NPV (20-yr)
$162.80M
@ 8.5% WACC
Project IRR
28.4%
Internal return rate
Simple Payback
2.4 yrs
CapEx amortization
Unit Cost (LCOAhf)
$1,450/t
$/metric ton pure AHF
Plant & Process Parameters
First-PrinciplesIntegrated Refinery & Downstream Fluorine Hub
Closed-Loop FlowAcidspar Output
51,877 t/y
Total AHF Yield
25,900 t/y
H2SO4 Consumption
69,850 t/y
Synthetic Gypsum
88,200 t/y
Annual Revenue Streams
| Product / Byproduct Stream | Annual Revenue |
|---|---|
| Merchant Anhydrous HF (AHF) | $25.64M |
| Electronic Grade HF (49% UP-SS Semiconductor) | $33.95M |
| Lithium Hexafluorophosphate ( Salt) | $45.80M |
| Polyvinylidene Fluoride (PVDF Binder Resin) | $16.64M |
| Synthetic Anhydrite Byproduct () | $2.47M |
| Total Gross Annual Revenue | $124.50M |
Annual Operating Expenditures (OPEX)
| Cost Driver Category | Annual OPEX |
|---|---|
| Sulfuric Acid Reagent (98% ) | $9.78M |
| Mining & Froth Flotation Beneficiation | $3.36M |
| Rotary Kiln Thermal Heating Energy | $1.68M |
| Cleanroom Distillation & Purification OPEX | $10.25M |
| Fixed Labor, Environmental Scrubbing & SG&A | $14.00M |
| Total Annual Operating Costs | $39.07M |
20-Year Project NPV Sensitivity ($M USD)
Stress-test project financial resilience across variations in Run-of-Mine Fluorspar Ore Grade () and Merchant Anhydrous HF Benchmark Pricing ().
| Ore Grade \ AHF Price | -20% Price | -10% Price | Base Price | +10% Price | +20% Price |
|---|
Green highlights indicate highly accretive project scenarios with NPV ≥ $50M at 8.5% WACC.
Kiln Reaction Thermodynamics & Stoichiometry
Primary Decomposition Reaction
CaF2 (s) + H2SO4 (l) → 2 HF (g) + CaSO4 (s)
(endothermic). Finely ground acid-grade fluorite concentrate (>97% , <1.0% ) is premixed with 98% sulfuric acid in a kneader or co-current mixer before feeding into the externally fired rotary kiln at 200°C to 250°C.
Silica Impurity Parasitic Consumption
SiO2 + 4 HF → SiF4 (g) + 2 H2O
SiF4 + 2 HF → H2SiF6 (fluosilicic acid)
Silica () is the most damaging impurity in fluorspar. Every 1.0% in the feed consumes approximately 2.7% and generates volatile , severely diminishing net HF recovery and contaminating distillation reboilers.
Strategic High-Tech Pillars & End Markets
Semiconductor Wet Etching & RCA Clean
Ultra-Pure Electronic Grade HF (UP-SS / PPT grade, 49% conc.) and Buffered Oxide Etch (BOE, ) selectively etch native () without attacking underlying crystalline silicon.
Lithium-Ion Battery Electrolyte & PVDF
AHF is reacted with and to synthesize conducting salt. Additionally, fluorinated monomer VDF polymerizes into PVDF cathode binder and separator coating.
Green Hydrogen Proton Exchange Membranes
Perfluorosulfonic acid (PFSA, Nafion) membranes for PEM water electrolyzers and fuel cells require tetrafluoroethylene (TFE) derived from chlorodifluoromethane (R22/AHF).
Synthetic Anhydrite Byproduct Circularity
Over 1.74 tons of synthetic anhydrite () generated per ton of reacted are neutralised with lime and sold to cement kilns and floor screeds, achieving 100% solid waste circularity.
Fluorspar Refining & Fluorochemistry Assessment
Validate your engineering and project finance mastery across 4 industry-calibrated questions.
Frequently Asked Questions
Acid-grade fluorspar (acidspar, containing at least 97% calcium fluoride with less than 1.0% silica) is the single global primary precursor for hydrogen fluoride (HF) and hydrofluoric acid. There is no commercial substitute for acidspar in HF manufacturing. HF is the chemical cornerstone for semiconductor wafer etching (electronic grade HF), lithium-ion battery electrolytes (lithium hexafluorophosphate, LiPF6), cathode binders (polyvinylidene fluoride, PVDF), proton-exchange membranes for green hydrogen (Nafion/PFSA), uranium fuel enrichment (UF6), and low-GWP refrigerants. Because global fluorspar mining and refining are heavily concentrated in a handful of jurisdictions, both the United States and European Union classify fluorspar as a high-supply-risk critical raw material.
Inside the externally fired rotary kiln at 200°C to 250°C, finely ground acidspar reacts with concentrated sulfuric acid (98% H2SO4) according to the endothermic reaction: CaF2 + H2SO4 -> 2 HF (gas) + CaSO4 (synthetic anhydrite). Silica (SiO2) contamination is severely penalized because silica reacts avidly with generated HF: SiO2 + 4 HF -> SiF4 (gas) + 2 H2O. Each unit of silica not only consumes valuable hydrofluoric acid but also generates silicon tetrafluoride gas, which reacts with moisture to form corrosive fluorosilicic acid (H2SiF6). This causes severe acid yield loss, fouls gas scrubbers, and increases distillation purification costs.
Crude AHF gas emerging from the rotary kiln is scrubbed of entrained sulfuric acid and dust, condensed into liquid, and passed through fractional distillation columns to strip light ends (SiF4, SO2) and heavy ends (H2SO4, H2O). For semiconductor-grade HF (Parts-Per-Trillion / UP-SS grade), the distilled AHF is dissolved in ultra-pure deionized water under cleanroom class 1/10 conditions, followed by sub-boiling non-metallic distillation, specialized ion-exchange resin columns, and sub-micron PTFE membrane filtration. This reduces metallic cation impurities (Fe, Cu, Ni, Na) below 10 parts-per-trillion, essential for sub-5nm logic gate etching and Buffered Oxide Etch (BOE) formulations.
Hydrofluoric acid provides the fluorine backbone for two critical lithium-ion battery components: the conductive electrolyte salt and the cathode binder. First, AHF reacts with phosphorus pentachloride (PCl5) and lithium fluoride (LiF) to synthesize lithium hexafluorophosphate (LiPF6), which represents over 85% of global commercial battery electrolyte salts. Second, AHF is used to produce vinylidene fluoride (VDF), which polymerizes into polyvinylidene fluoride (PVDF). PVDF is the indispensable binder that adheres high-nickel cathode active materials (NMC/LFP) to aluminum current collector foils and coats battery separator films for thermal stability.
For every metric ton of pure CaF2 reacted, the rotary kiln generates approximately 1.74 metric tons of calcium sulfate (CaSO4, synthetic anhydrite). Rather than incurring hazardous waste landfill disposal fees, modern plants neutralize residual acidity with lime and sell the dry synthetic anhydrite to the construction industry for $20 to $35 per metric ton. It is highly valued as a retarder in Portland cement manufacturing and as a binder for high-performance self-leveling floor screeds, replacing quarried natural gypsum and reducing Scope 3 mineral extraction footprints.