"Similar to the case above, it is difficult to identify an...

"Similar to the case above, it is difficult to identify an obvious downside to the IHP on the first sight as low-grade rock containing higher impurities can be used to produce high-quality phos acid without producing high-volume waste in the form of phos gypsum.The zero-grade waste is a commercial aggregate usable in the construction industries. This case clearly presents a best-practice example for a radical process innovation and even a product innovation given the preferable characteristics of the product in terms of contamination. In particular, the latter also represents a societal innovation to some extent, given the positive influence on human and animal health through the reduction of heavy-metal content. However, besides the energy intensity, Rear Earth and Uranium are bound within the aggregate emerging from the reduction kiln. Recovery of these by-products is strongly restricted. To what extent the technology will affect the market is currently rather hard to estimate since it is still in a developing stage. Nevertheless, the potential seems to be huge. In the case of Florida, the rather diminishing high-grade reserves could be massively enhanced if the cut-off grade gets lowered. The technology might also put additional capacities from countries with comparable highly-contaminated phos rock on the market. Australian Avenira Ltd. already holds the exclusive license for the IHP for Australia and Senegal."

https://res.mdpi.com/minerals/minerals-08-00395/article_deploy/minerals-08-00395.pdf?filename=&attachment=1

this is doesn't even mention the capex and opex benefits of the ihp.