| 摘要 |
A process for the production of highly pure concentrated hydrofluoric acid by purifying crude HF gas containing H2O, SO2, SiF4, S,CaF2, H2SO4 and CaSO4 and obtained in the reaction of fluorite and sulphuric acid, whereby the resultant HF has an H2SO4 content of the order of a few ppm, there are substantially no deposits of CaSO4 in the first H2SO4 washing circuit and the service life of the system is considerably lengthened.
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