the paper discusses every factors that affect 「double-nine」ratio of chromium metal with thermit process, considers that aluminite powder size is the primary factor.
论述了影响铝热法金属铬"双九"率的各种因素,认为铝粉粒度是主要因素。
methods:taking a quota the aluminite powder to put in the extract pond to make the absorbent, carries on the fast solvent extraction to the fish flesh.