Abstract: Disclosed herein are methods for the recovery of one or more rare earth elements (REEs). More specifically, disclosed herein is a method comprising n stages, wherein each stage comprises treating a sample comprising one or more REEs with a reagent to form a carbonate, hydroxycarbonate, bicarbonate of one or more rare earth elements. The sample’s pH is adjusted, and the sample is aged to form solid and liquid fractions, where the solid fraction comprises a precipitated salt of the REEs. The method is repeated an n number of times to maximize the recovery % of REEs. This abstract is intended as a scanning tool for the purpose of searching in the particular art and is not intended to be limiting of the present disclosure.

Abstract: There is provided methods and systems for the reduction of nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions. The preferred carbonaceous fuel is coal. The invention provides methods and systems comprising the use of coal as a reburn fuel for coal combustion systems. The invention comprises low temperature pyrolysis producing gaseous hydrocarbons for the reduction of nitrogen oxides and treatment of char with resulting reduction of carbon loss.

Abstract: There is provided methods and systems for the reduction of nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions. The preferred carbonaceous fuel is coal. The invention provides methods and systems comprising the use of coal as a reburn fuel for coal combustion systems. The invention comprises low temperature pyrolysis producing gaseous hydrocarbons for the reduction of nitrogen oxides and treatment of char with resulting reduction of carbon loss.