Integration along the Lifecycle of Calcium Fluoride in the Fluorine Industry

摘要

The recovery of fluoride from industrial wastewaters as a product to be reused and its integration along the lifecycle is presented as priority objective of the fluorine industry in order to contribute to the development of sustainable processes. In this work, the computer aided integration of processes is applied to the dry fluorspar process of the Aluminum Trifluoride manufacture from HF, with a fluoride recovery/recycling process based on a fluidized bed crystallization step leading to a significant saving of raw material CaF_2. A 5% saving of CaF_2 was obtained with a fluoride recovery yield in the crystallization system of 65% as calcium fluoride referred to the total fluoride losses.