The phrase "refinement process" refers to the act of improving or making something better through continuous adjustments and enhancements. Full definition
The notorious tar sands in Alberta, Canada have long been a source of contention for environmentalists, and rightfully so: Due to the destruction wrought by extracting the oil from the sands and the carbon - intensive refinement processes, this oil is often considered the dirtiest on earth. (treehugger.com)
Using genuine grain varieties as raw materials and the latest physical refinement processes, flours with added value for health, pre-mixes and extrusion products come to life. (foodingredientsfirst.com)
The NYT article found that «similar refinement processes transform other plants like poppies and coca into heroin and cocaine. (resetyourweightbasics.com)