Direct reduction method for producing medium-and-low-carbon manganese-iron alloy

Abstract

The invention discloses a direct reduction method for producing a medium-and-low-carbon manganese-iron alloy. The invention aims to provide a direct reduction method for producing a medium-and-low-carbon manganese-iron alloy. The method is characterized by comprising the following steps: A, mixing manganese ores, blind coal and limestone, putting into a pulverizer, and pulverizing to 100-120 meshes; B, briquetting the pulverized mixture obtained in the step A, and drying at 200-300 DEG C; C, putting the briquettes obtained in the step B on a distribution vehicle, feeding into a tunnel type reducing furnace, and performing high-temperature reduction roasting with coal gas at 1140-1180 DEG C for 150-180 minutes; and D, throwing the reduction roasting briquettes obtained in the step C into an electric furnace, and smelting to obtain the product medium-and-low-carbon manganese-iron alloy and furnace slag, wherein the furnace slag is transferred to serve as a raw material of cement. The method is mainly used for production of a medium-and-low-carbon manganese-iron alloy.

Description

technical field [0001] The invention relates to a direct reduction method, in particular to a direct reduction method for producing medium and low carbon ferromanganese alloys. Background technique [0002] There are three traditional methods for producing medium and low carbon ferromanganese alloys: one is the electrosilicon heating method, that is, manganese ore is first smelted into manganese-rich slag → smelted into silicon-manganese alloy → mixed with manganese-rich slag to form medium and low-carbon ferromanganese alloy; The second is to use high-carbon ferromanganese to blow oxygen and decarburize to prepare medium and low-carbon ferromanganese alloys; the third is electrolysis; the disadvantage of the first method is that the process is long and the recovery rate of manganese is low (only about 55%); The disadvantages of the two methods are that the production process of high-carbon ferromanganese has large pollution, high requirements on raw material quality, and hi...

AI Technical Summary

Problems solved by technology

[0002] There are three traditional methods for producing medium and low carbon ferromanganese alloys: one is the electrosilicon heating method, that is, manganese ore is first smelted into manganese-rich slag → smelted into silicon-manganese alloy → mixed with manganese-rich slag to form medium and low-carbon ferromanganese alloy; The second is to use high-carbon ferromanganese to blow oxygen to decarburize to prepare medium and low-carbon ferromanganese alloys; the third is electrolysis; the disadvantage of the first method is that the process is long and the recovery rate of manganese is low (only about 55%); The disadvantages of the two methods are that the production process of high-carbon ferromanganese has large pollution, high requirements on the quality of raw materials, and high energy consumption; the disadvantages of the third electrolysis method are serious pollution, environmental damage, and high production costs.

Images