The invention relates to an
engineering process for producing a low-iron low-
silicon 3004
alloy by directly cast-rolling electrolytic
aluminium liquid. The process comprises the procedures of
alloy aluminium melting, ingredient adjusting, on-line refining for three times, standing,
outgassing, grain refining, filtering, tilting cast-rolling, homogenizing, cold rolling, intermediate annealing, another cold rolling, full annealing, recoiling and packaging. The refining comprises
powder spraying refining in a
melting furnace and combined refining of on-line
argon and
carbon tetrachloride introducing. The annealing comprises high-temperature quick annealing, the intermediate annealing and the full annealing. During the cast-rolling, the temperature in a front box is 710-720 DEG C, and the cast-
rolling speed is 600-900 mm / min. The product is the low-iron low-
silicon 3004
alloy. The low-iron low-
silicon 3004 alloy comprises 0.06-0.14 wt% of Si, 0.25-0.43 wt% of Fe, 0.012-0.14 wt% of Cu, 1.0-1.2 wt% of Mn, 0.8-1.0 wt% of Mg, at most 0.02 wt% of Zn, 0.015-0.03 wt% of Ti and the balance of Al. The invention has the characteristics of simple procedure, energy saving, emission reduction, goodalloy performance and low earring rate.