to extract (ore, minerals etc); to refine; to purify; to process[cedict]
过
guòㄍㄨㄛˋ
(experienced action marker); to cross; to go over; to pass (time); to celebrate (a holiday); to live; to get along; excessively; too-; surname Guo[cedict]
之后
zhī hòuㄓ ㄏㄡˋ
afterwards; following; later; after[cedict]
就是
jiù shìㄐㄧㄡˋ ㄕˋ
(emphasizes that sth is precisely or exactly as stated); precisely; exactly; even; if; just like; in the same way as[cedict]