Recovery of rare earth metals and precipitated silicon dioxide from phosphorus slag

Predicting Gaseous Pollution of Sintered Brick Preparation from Yellow Phosphorus Slag

“…(7)). (7) Migration and Transformation of Phosphorus Fig. 3 depicts the distribution of P-containing species in different phases during the heating process.…”

Pyrometallurgical Treatment of Apatite Concentrate with the Objective of Rare Earth Element Recovery: Part II

“…1), SiO 2 is used as a flux in order to achieve operating temperatures of the order of 1500°C, and it produces a low-phosphorus slag (\ 1 wt% P) [4], which should result in a similar outcome to the silicothermic extraction experiments presented in Part I of the present article, i.e., a low final concentration of REEs. Recently published work by Karshigina et al [17] has disclosed a method using extremely concentrated nitric acid (due to the stability of the silicates) to recover REEs from high-silica discard slag produced as a by-product of the conventional carbothermic phosphorus process. The high-acid leach would seem to indicate difficulties in treating such slag, and the economics of such a process could be questioned particularly with the current low prices for REEs, as previously indicated in Fig.…”

Phase relations of CaO‐Al2O3‐Sc2O3 ternary system

“…A concentrate containing approximately 50% of REE (corresponding to 97%–99% Ln 2 O 3 ) was obtained using 400 g/L ammonium nitrate solution as an eluent followed by REE carbonates precipitation from the eluent by ammonium hydrocarbonate solution. Karshigina et al used nitric acid treatment of phosphorus slag was studied, and the recovery efficiencies of various elements were the following: rare‐earth metals, 98.3%–98.6%; aluminum, 96.5%–98.6%; iron, 94.9%–96.5%; and calcium, 99.1%–99.5%. Nitric acid (46.5%) was selected as the phosphorus slag recovery agent.…”