The invention discloses a method for producing
ferrochrome and relates to chain grate-
rotary kiln combined metalized pellet hot-filled methods for producing
ferrochrome. The method is characterized in that a production process sequentially comprises the steps of proportioning materials,
drying, carrying out ball milling, carrying out water-sprayed mulling, carrying out material waking,
pelletizing, carrying out
drying and preheating, carrying out
rotary kiln pellet prereduction, carrying out hot filling and carrying out submerged-arc furnace
smelting. According to the method disclosed by the invention, through material proportioning, ball milling and
pelletizing,
exhaust gas of a
rotary kiln is used for
drying and preheating in a chain grate,
coal gas of a closed submerged-arc furnace and
natural gas are used for heating, carbon in
coke powder is used for reducing oxides of
chromium and iron in
chromite ore
powder pellets, the comprehensive
reduction rate of
metal is controlled to reach 55-70%, the
pellets are enabled to be metalized, and then, hot filling is used for carrying out transporting so as to supply high-carbon
ferrochrome to submerged-arc furnace
smelting. The method disclosed by the invention has the advantages that furnace conditions are effectively improved, the production process is stable in process, the reduction efficiency is high, the
power consumption is low, the
production cycle of the submerged-arc furnace is shortened, the consumption of the raw materials is low, the
metal recovery rate is high, and the
discharge of pollutants, such as dust and SO2, is low.