Method for microwave pre-roasting and submerged arc furnace combined production of manganese-iron alloy

Belonging to the technical field of microwave metallurgy and manganese-iron alloy smelting, the invention relates to a method for microwave pre-roasting and submerged arc furnace combined production of manganese-iron alloy. The method includes: crushing manganese ore and a carbonaceous reducing agent, then mixing them evenly to obtain a mixed material; pre-roasting the mixed material under microwave condition to obtain a hot material; and then placing the obtained hot material into a submerged arc furnace, adding coke and conducting heating in the submerged arc furnace to 1450-1550DEG C to perform smelting, thus obtaining the manganese-iron alloy. In the microwave pre-roasting process, microwave heating can be carried out in a microwave shaft furnace. The method has short production cycle and low energy consumption, and can properly solve various harmful phenomena caused by charging of cold materials into the furnace.