Method for treating lean ferrous manganese ore by directly reducing electric furnace melting components through rotary hearth furnace

A rotary hearth furnace and manganese iron ore technology, which is applied in the treatment field of lean manganese iron ore, can solve the problems of high energy consumption, large amount of flue gas, viscous slag, etc., and achieves simple process, low energy consumption and high recovery rate. Effect

Active Publication Date: 2014-09-17
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0012] (2) Although the primary investment of the rotary kiln is lower than that of the rotary hearth furnace, due to the high energy consumption of the direct reduction process of the rotary kiln and the low metallization rate of DRI, the investment recovery period of the rotary kiln is higher than that of the rotary hearth furnace
Acidic slag is used in the smelting process, which severely corrodes the carbonaceous furnace lining, the lining life is short, and the slag is relatively viscous, which increases the power consumption of electric furnace smelting
[0017] (2) Rotary kiln is used to preheat manganese ore, which has a large amount of flue gas, serious pollution and low production efficiency
The temperature control of manganese-rich slag electric furnace smelting process is strictly controlled. When the temperature is higher than 1410℃, MnO is reduced to Mn and enters the molten iron, and the yield of Mn in manganese-rich slag decreases.
[0018] (3) High-carbon ferromanganese coke smelted by electric furnace is all added externally, resulting in large ignition loss and low utilization rate of coke

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  • Method for treating lean ferrous manganese ore by directly reducing electric furnace melting components through rotary hearth furnace

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specific Embodiment 1

[0048] Manganite composition: TFe 11.1%, Mn 24.2%. The manganese ore and anthracite are crushed to less than 4mm, the fixed carbon in the reducing agent is 78.15%, the ash content is 8.21%, the volatile matter is 12.23%, and the total sulfur is 0.15%. The material ratio is: ferromanganese ore: pulverized coal: binder = 100:13:4. Control the moisture content of the mixture between 6% and 8% to prevent dust or roll sticking caused by material mixing and over-drying or over-wetting of the mixture in the roller pressing ball. After the pressed pellets are dried (moisture content <2%), they enter the bottom of the rotary hearth furnace through a distribution machine, with a double-layer distribution and a thickness of about 24mm. The reduction temperature in the furnace is 1100-1300°C, of ​​which the temperature in the preheating zone is 1100-1200°C, the temperature in the middle temperature zone is 1200-1300°C, the temperature in the high temperature zone is controlled at about 1...

specific Embodiment 2

[0049] Manganite composition: TFe 12.47%, Mn 26.25%. The ferromanganese ore and anthracite are crushed to less than 4mm. The fixed carbon in the anthracite is 78.15%, the ash content is 8.21%, the volatile matter is 12.23%, and the total sulfur is 0.15%. The material ratio is: ferromanganese ore: pulverized coal: binder = 100:18:4. Control the moisture content of the mixture between 6% and 8% to prevent dust or roll sticking caused by material mixing and over-drying or over-wetting of the mixture in the roller pressing ball. After the pressed pellets are dried (moisture content <2%), they enter the bottom of the rotary hearth furnace through a distribution machine, with a double-layer distribution and a thickness of about 24mm. The reduction temperature in the furnace is 1100-1320°C, of ​​which the temperature in the preheating zone is 1100-1200°C, the temperature in the middle temperature zone is 1200-1300°C, the temperature in the high temperature zone is controlled at abou...

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Abstract

The invention discloses a method for treating lean ferrous manganese ore by directly reducing electric furnace melting components through a rotary hearth furnace. The method comprises the following steps of: breaking ferrous manganese ore and reducing coal to below 4mm; drying and adding a bonding agent for uniformly mixing and pressing into pellets, wherein the grade of Mn in the ferrous manganese ore is 23-28 percent; feeding green balls generated by drying the pellets into the rotary hearth furnace; heating the green balls to 1,100-1,300DEG C and reducing for 20-45 minutes; thermally filling high-temperature metallized pellets obtained by reducing into a tank; directly feeding the tank into the electric furnace for melting and separating; controlling the temperature of the electric furnace melting components to 1,450-1,550DEG C; melting the electric furnace melting components for 40-90 minutes; collecting the produced manganese iron and furnace slag at the bottom of the furnace and discharging the produced manganese iron and furnace slag through an iron tapping hole at regular period and separating the melt slag; and refining and desulfurizing the manganese iron obtained by melting components to obtain manganese iron of which the Mn content meets the requirement. The method disclosed by the invention can be used for treating low-grade ferrous manganese ore and has the advantages of simple process, low energy consumption and high recovery rate.

Description

technical field [0001] The invention relates to a processing technology of manganese-poor iron ore, in particular to a method for treating manganese-depleted iron ore through direct reduction in a rotary hearth furnace-electric furnace melting. Background technique [0002] As an important raw material for steelmaking, manganese plays an important role in the national economy. Manganese minerals mainly include pyrolusite (MnO 2 ), hard manganese ore, metamanganate ore, manganese ore, brown manganese ore, black manganese ore, etc. There are not many high-grade manganese ore reserves in nature, and low-grade manganese ore reserves are relatively abundant. However, due to the problems of dressing and smelting technology, economy and environment, this kind of ore has not been effectively developed and utilized. [0003] Pyrochemical treatment uses coal as a reducing agent to achieve MnO 2 The conversion to MnO mainly includes reverberatory furnace method, rotary kiln roasting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C21B13/14
Inventor 吴道洪古明远曹志成薛逊
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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