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Producing medium carbon magnganese iron by duplexing rocking furnace method

A medium-carbon ferromanganese and shaking furnace technology is applied in the production field of manganese-based ferroalloy products and can solve the problems of unstable manganese content in the final slag.

Active Publication Date: 2006-06-28
云南文山斗南锰业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it has been found from actual production that due to the change in the composition of the medium manganese slag or the composition of the manganese-silicon alloy, the manganese content in the final slag after shaking furnace pre-refining is unstable.

Method used

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  • Producing medium carbon magnganese iron by duplexing rocking furnace method
  • Producing medium carbon magnganese iron by duplexing rocking furnace method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Manganese ore, coke and silica are added to the manganese silicon furnace. The composition of manganese ore is: Mn30, SiO 2 23.33, Fe3.03, CaO10.46, Al 2 o 3 1.2, MgO2.89; 80% fixed carbon of coke; SiO of silica 2 More than 98%, the above materials are smelted to obtain liquid manganese-silicon alloy, the composition is (weight ratio): Mn67, Si20, Fe11, C1.2, P0.2.

[0018] Add 3286 kg of manganese-rich ore to the refining furnace, the composition is (weight ratio): Mn42, Fe3.1, CaO4.1, SiO 2 7.2, add 3700 kg of lime (CaO greater than 85) and 25 kg of fluorite to control the alkalinity of 1.3. After melting, add the pre-refined liquid intermediate alloy returned from the initial shaking furnace and the final shaking furnace, and then add 1410 to the refining furnace. One kilogram of manganese-rich ore is refined by increasing manganese and reducing silicon, and refining is carried out according to the existing method.

[0019] The refining furnace and manganese-sil...

example 2～4

[0027] According to the same technological process of embodiment 1, the manganese-rich ore / liquid manganese-silicon alloy is 1: 1.1, the manganese-silicon alloy composition is: Mn67, Si20, Fe11, C1.2, and the liquid manganese-silicon alloy is added respectively with 1 / 2 of the total amount The initial shaking furnace and the final shaking furnace; both the initial shaking furnace and the final shaking furnace run at 60 rpm, eccentric distance 40 mm, and run for 12 minutes; The manganese content of the liquid is 20.2, 21.4 and 22.8 respectively, the manganese content of the primary slag, the manganese of the final slag and the manganese content of medium carbon ferromanganese products are shown in Table 1.

[0028] Medium manganese slag contains manganese

[0029] It can be seen from the above table that the manganese content of the medium manganese slag changes, the manganese content of the initial shake slag changes significantly, and the change of the manganese cont...

example 5～10

[0031] According to the same technological process of embodiment 1, both the initial shaking furnace and the final shaking furnace were operated for 15 minutes at 40 rpm and 100 millimeters of eccentricity; the manganese-silicon alloy composition was: Mn67, Si20, Fe11, C1.2; manganese-rich ore The composition is: Mn42, Fe3.1, CaO4.1, SiO 2 7.2; 1 / 2 of the total amount of liquid manganese-silicon alloy is added to the initial shaking furnace and the final shaking furnace respectively. When the ratio of manganese-rich ore / liquid manganese-silicon alloy is 1:0.7-1.2, the initial shaking slag contains manganese and the final shaking slag contains manganese and medium carbon ferromanganese products containing manganese, see Table 2.

[0032] Manganese-rich ore / liquid manganese-silicon alloy

[0033] When the ratio of manganese-rich ore / liquid manganese-silicon alloy is 1:0.7 and 1:0.8, the amount of Si in the liquid manganese-silicon alloy is obviously not enough to reduc...

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Abstract

The invention relates to a duplex rocking furnace method used to produce carbon ferromanganese. It includes the following steps: leading manganese slag thermal fluid to start rocking furnace; adding 1 / 2 liquid state manganese-silicon by weight; swing; leading the formed start rocking slag into final rocking furnace; adding the rest 1 / 2 liquid stage manganese-silicon; rocking; the fining procedure is as follows: adding rich manganese ore with not less than 40% manganese content; charging quantity is the 3 / 4 of the proportioning by weight; adding liquid state middle alloy into fining furnace; adding the rest 1 / 4 rich manganese ore; their ratio by weight is 1.1-0.85:1. The invention adopts four furnaces linkage to increase manganese recovery rate. Compared with fining carbon ferromanganese by single rocking furnace method, it can reduce 2-4 percent of final slag manganese containing, and reach under 7% to further increase manganese recovery rate.

Description

technical field [0001] The invention relates to the production of manganese-based ferroalloy products, in particular to a method for producing medium-carbon ferromanganese by a double-connected shaking furnace method. Background technique [0002] The carbon content of medium carbon ferromanganese is >0.7%≤2.0%, which is widely used in the production of special steel. [0003] At present, there are three types of methods for producing medium carbon ferromanganese: electric silicothermal method, shaking furnace method, and oxygen blowing method. And each category derives a variety of methods according to its different characteristics, such as electric silicon thermal method is divided into cold, hot charging method, low alkalinity method; shaking furnace method is divided into shaking furnace external pre-refining method, shaking furnace refining method method; oxygen blowing method is divided into oxygen blowing decarburization method and oxygen blowing desiliconization ...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/04
Inventor 王运正高德云张承贵王宁屠章云汤顺强抗祖辉刘世阳孙仲春
Owner 云南文山斗南锰业股份有限公司
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