RE: Adonis Pouroulis Morocco15 Dec 2020 14:25
NICODEMUS63
I am not a geologist but I have been to a number of phosphate plants, non of which are processing their gypsum (calcium sulphate) piles. Phosphates and calcites (calcium carbonates) are both sedimentary deposits, so are often found in the same region. The first stage, after crushing the ore is to react it with excess sulphuric acid. This produces phosphoric acid and gypsum. The phosphoric acid can then be used in other tail end production processes. The insoluble gypsum is separated out, generally as a waste product and piled up. The key question is, are there rare earth elements also within the insoluble gypsum? I am guessing, based on the phosphate plants I have been to, generally not in sufficient quantity to justify further separation.
As the RNS has stated, on South Africa, there is. Having removed the phosphate (P2O5) fraction (I am guessing 20 - 30%), the concentration within the gypsum pile is now greater. In addition the site have separated out the phosphate fraction leaving it easier and less costly to further concentrate the rare earth elements.