A study on the low-temperature wet synthesis of hydrofluoric acid from synthetic calcium fluoride and waste sulfuric acid

An innovative method for utilizing synthetic calcium fluoride (CaF2), recovered from fluoride-containing semiconductor wastewater, and waste sulfuric acid (H2SO4) to produce hydrofluoric acid (HF) was investigated. The research was set to study the low-temperature production of HF via the reaction o...

Full description

Saved in:
Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2020-03, Vol.463 (1), p.12098
Main Authors: Lin, Min-Fa, Chang, Chih-Ping, Chang, Ken-Lin, Lee, Wen-Jhy, Wu, Jhong-Lin, Chen, Po-Han
Format: Article
Language:English
Subjects:
Calcium
Calcium fluoride
Drying
Fluorides
HF productivity
Hydrofluoric acid
Low temperature
Room temperature
Sulfuric acid
Synthetic CaF
Waste sulfuric acid
Wastewater
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An innovative method for utilizing synthetic calcium fluoride (CaF2), recovered from fluoride-containing semiconductor wastewater, and waste sulfuric acid (H2SO4) to produce hydrofluoric acid (HF) was investigated. The research was set to study the low-temperature production of HF via the reaction of synthetic CaF2 and waste H2SO4. The impact of H2SO4 concentration and total volume (H2SO4 + H2O)/CaF2 ratio, drying temperature of synthetic CaF2 on HF productivity were investigated in this study. HF yield increased with increasing H2SO4 concentration and total volume/CaF2 ratio under room temperature. In addition, the HF produced in the reactions involving the 105 °C-dried synthetic CaF2 were higher than the 600 °C-dried synthetic CaF2 ones. The study will not only find uses for this semiconductor wastes but also provide a greener alternative to the current commercial production of HF.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/463/1/012098