The invention discloses a method for producing a ferrochromium
alloy by two-step-process
smelting reduction of ferrochromium mineral
powder. The method comprises the following steps: (1) preparing raw materials, namely uniformly mixing the ferrochromium mineral
powder with
coke powder, and
pelletizing on a disk
pelletizing machine; (2) performing pre-reduction, namely uniformly distributing green
pellets on a chain grate, preheating and
drying the green
pellets, loading the green
pellets which are preheated and dried into the
rotary kiln for pre-reduction, and burning by using
coal gas generated by a final reduction section iron bath furnace for
heat supply, wherein an adopted heat source is
kiln tail waste gas from a
rotary kiln; (3) performing final reduction, namely adding high-temperature pre-reduction pellets from the top of the iron bath furnace through a spiral
discharger, thermally loading the pellets into the iron bath furnace for melt separation, spraying
coal powder and
oxygen into an iron bath by utilizing a
coal oxygen spraying gun, burning the coal powder and the
oxygen in the iron bath, supplying heat needed by the melt separation, after the melt separation is completed, performing
slag iron separation, and discharging iron and
slag. According to the method, the ferrochromium mineral powder can be largely treated, and utilization of powder mines is improved, so that the production cost of the ferrochromium
alloy is reduced, and large-scale production is facilitated.