Liu'zhou Iron & steel Group Co. in its FCG project (phase I) iron and steel base, the air separation units including No. 1, 2 and 3,   adopts vertical radial flow mechanism of molecular sieve purification, pressurization turbine expansion to make refrigeration, expanded air enters into lower column, fully distillated system of argon , the structured packing tower, an internal compression process of oxygen, for 3 sets of 40000 Nm3 /h air separation plants,. At the same time they also manufacture the rare gases of neon, helium, krypton, xenon at a crude level that can be further upgraded later.