JPS58104151A - Manufacture of low-carbon ferromanganese - Google Patents

Abstract

PURPOSE:To manufacture low-C low-P ferromanganese by reducing a mixture of manganese ore with a slag forming material and by reacting the resulting melt contg. manganese oxide with a noncarbonaceous reducing agent. CONSTITUTION:A reducing agent is added to a mixed composition consisting of manganese ore and a slag forming material, and they are melted by heating with a blast furnace or the like to reduce at least the iron component in the composition and to form a metallic phase and a nonmetallic phase. An adequate amount of a carbonaceous material is used as the reducing agent. The resulting melt contg. manganese oxide as the nonmetallic phase is separated from the metallic phase and charged into a reactor provided with a horizontal or bottom blowing nozzle, and after blowing a noncarbonaceous reducing agent together with a carrier gas, they are reacted in the reactor. One or more among ferrosilicon, metallic Si and Al are used as the noncarbonaceous reducing agent, and gaseous nitrogen or Ar is used as the carrier gas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing low carbon, low phosphorous grooved gun iron.

As technological innovation progresses, steel also contains special ingredients depending on its intended use, while impure ingredients have come to be disliked. Accordingly, it is desired that the manganese iron used as a deoxidizing agent for iron A or as an additive for alloying components has a low content of impurities, especially a low content of carbon and phosphorus.

For this reason, conventionally, this type of manganese iron is produced by a wet method, but by a dry method using an electrolytic manganese method. Medium carbon grooved iron and low carbon manganese iron were used.

However, although electrolytic metal manganese has a high manganese grade and low silicon and carbon content, it has the drawbacks of high oxygen content and sulfur content, and high manufacturing cost.
Although low carbon ferromanganese is relatively inexpensive to obtain and has a low sulfur content, it has been difficult to produce low carbon, low silicon, and low phosphorus content.

To produce medium- to low-carbon ferromanganese, a method is adopted in which silicomanganese with a low carbon content is produced as an intermediate, and then this silicomanganese is desiliconized with manganese ore. In order to reduce the carbon content of medium- to low-carbon ferromanganese, it is necessary to increase the silicon content of the intermediate silicomanganese, and as a result, the silicomanganese is often desilicated by the manganese ore. For the following reasons, it becomes difficult to remove silicomanganese, and silicon remains in the product, or it takes a long time to remove it.

This is because silicomanganese and manganese ore undergo a reaction as shown in the reaction equation below, and as is clear from equation (1), silicomanganese desilicification progresses. This is because (MnO) a in the molten layer decreases, and as the [Si] concentration decreases, the desilting rate rapidly decreases.

(Si)+2(MnO)−+ 2(Mn)+(S10s
)-・-m Conventionally, a method for producing high-grade manganese iron using a dry process that eliminates this drawback involves equipping a reaction vessel with manganese-containing oxide i@ melt, a non-carbonaceous reducing material, and a slag-forming material. A method has been proposed in which the reaction vessel is caused to perform a horizontal eccentric circular motion after being placed in the reaction vessel.

However, in this method, the reaction vessel is caused to perform horizontal eccentric circular motion, but as shown by reaction equation (1), as the desiliconization of silicomanganese progresses, the manganese content of the metal phase increases and the specific gravity increases. becomes large, and the nonmetallic phase becomes M
Since the nO content decreases and the content becomes lighter, even if a horizontal eccentric circular motion is applied to the contents in the reaction vessel, the movement between the two will only move in parallel and the relative position will not change much. The reaction of 7'cA'), 7,
34 Luca 2 pieces + 94. In the case of ferromanganese, it is necessary to complete the desiliconization reaction in a state where the (MnO) content of the manganese-containing i-ide melt is sufficiently high, and the resulting ferromanganese may contain many impurities. There are drawbacks.

The present inventors completed the present invention as a result of research to provide a method for producing Mangan iron with low silicon, carbon, and phosphorus content, which does not have these drawbacks. The mixed composition with the slag material is reduced to a metallic phase and a non-metallic phase by reducing at least the iron content in the mixed composition using a reducing agent, and the obtained manganese-containing oxide melt of the non-metallic phase is side-blown. Alternatively, the material is charged into a reaction vessel having a bottom blowing nozzle, and then the non-carbonaceous reducing material is entrained in a carrier gas and blown into the reaction vessel through the nozzle to cause the two to react to obtain low carbon ferromanganese. It is characterized by:

The manganese-containing molten material obtained by reducing at least the iron content in the mixed composition of the manganese ore and the slag-making material using a reducing agent can be filled using an electric furnace or a blast furnace. It is obtained by heating and melting a mixture of gun ore, slag material, and reducing material, and separating the nonmetallic molten phase from the resulting molten mixture of the nonmetallic phase and the metallic phase.

If an appropriate amount of carbonaceous material is used as the reducing material at this time,
The metal phase becomes high carbon ferromanganese, and if silicomanganese is used as the reducing agent, the metal phase becomes medium carbon or low carbon ferromanganese. At this time, it is possible to reduce the phosphorus content in the nonmetallic phase by using a reducing agent necessary to reduce the iron content in the raw material.

The reaction vessel used in the present invention includes the embodiment shown in Fig. 1, a reaction vessel having a side blowing or bottom blowing nozzle, or a porous plug for stirring the melt by gas blowing and a top blowing nozzle as shown in Fig. 2. A reaction vessel having a nozzle is mentioned.

Further, these will be explained in detail.

In FIG. 1, l is a reaction vessel (a ladle can be used for this) made of refractory material, 2 is a settling ring,
After charging the manganese oxide melt into the reaction vessel, i
! 8＠To prevent substances from being released outside the reaction vessel,
It is also used to secure the burner cone 6 and burner 7. 3 is a nozzle for injecting non-carbonaceous reducing material.
4 is a supply tank for the non-carbonaceous reducing material, 5 is a carrier gas feed via, and 11 is an air vent.

Further, in FIG. 2, after a manganese-containing oxide melt tube is charged into the reaction vessel 1', a settling ring 2', a burner cone 6' and a burner 7' are fixed. 9 is a porous plug for blowing gas for stirring the melt through the same gas feed pipe IO, 8 is a top blowing nozzle for blowing non-carbonaceous reducing material, and 4' is its A supply tank for non-carbonaceous reducing material, 5' is a carrier gas feeding vibe. ” Silicon iron, metallic silicon, and aluminum are used as non-carbonaceous reducing materials. Nitrogen and argon gas are used as carrier gas.

According to the present invention, full-gas iron with a low content of silicon, carbon, and phosphorus can be easily produced by a dry method. If a non-carbonaceous reducing material, silicon metal, is used, it is possible to produce even higher quality manganese metal.

Further, according to the present invention, since the manganese-containing molten material and the metal coating tank are brought into sufficient contact with each other by the carrier gas, the non-carbon reducing material can be reduced to a state where the (MnO) content of the manganese-containing oxide melt is low. Since the reduction reaction proceeds, the amount of magnetism used in the manganese-containing oxide melt can be reduced for the same non-carbon reducing material, and therefore the impurities contained in the produced ferromanganese can be reduced.

In addition, the present invention provides that during the production of ferromanganese, thermal energy can be saved by converting the obtained slag into a molten manganese oxide, and adding a non-carbonaceous reducing agent to the molten slag to reduce the manganese oxide. I can do it.

Next, a sister embodiment of the present invention will be explained with reference to examples, but the present invention is not limited thereto.Example 1 A manganese-containing i-bath melt was tapped from a Ferro 7 Bustard production furnace. Using slag, this slag 2400 ky
was charged into a reaction vessel (bathroom temperature: 1488°C). Table 1 shows the quality of the slabs.

Table 1 After charging the slag into the ladle, immediately turn it into powdered 1i'sl.
7ml 1n of product No. 2 (particle size lfl or less) at room temperature
The mixture was blown into the slag from a side blowing nozzle at a speed of 100 mL to cause a reaction. FS:L
Table 2 shows the quality of No. 2 product.

Table 2 Powdered Fsi No. 2 product 132 kp was blown into the slag and reacted, followed by backward pouring to obtain ferromanganese and derived slag. The obtained ferromanganese and derived slag were 400 kp and 2100 kp, respectively. The quality of ferromanganese and H-derived slag are shown in Tables 3 and 4, respectively.
Shown in the table.

Table 8 Table 4 Example 2 Same manganese oxide melt as used in Example 1 25
00 kg was charged into a reaction vessel, and immediately 107 kl of powdered gold silicon (particle size of 1 m or less) was entrained in nitrogen gas according to Example 1, and blown into the manganese oxide melt to react. Table 5 shows the quality of gold and silicon.

Table 5 After the reaction is completed, the reaction product is tapped and the ferromanganese 3
I got 90kj's derived slug 2200kl.

The quality of the obtained Feromanga, N and derived slag are shown in Tables 6 and 7, respectively.

Table 6 Table 7 Example 3 Manganese ore 5200! Is 690 kg of quicklime and 460 kl of coke were mixed and melted in an electric furnace to produce 800 ky of ferromanganese and 2,500 ky of raw material slag.
I got ky. Table 8 shows the quality of the raw material slag.

Table 8 2500 ky of the obtained raw material slag melt was charged into a reaction vessel, and immediately 182 kp of metallic silicon was entrained in nitrogen gas and reacted by blowing it into 1 q of the raw material slag according to Example 1. Ta. After the reaction was completed, the reaction product was tapped to obtain ferromanganese 6501y and derived slag 2000 kP. The grades of the obtained ferromanganese and derived slag are shown in Tables 9 and 10, respectively.

Table 9 Table 1 O 1:1

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are each a schematic diagram of a manufacturing apparatus of two embodiments used in the manufacturing method of the present invention. 1, 1/@reaction vessel, 2, 2': Set ring 3,
3': Nozzle, 4, 4': Non-carbonaceous reducing material supply tank, 5, 5': Carrier gas supply pipe, 6, 6'
: Burner cone, 7, 7' : Combustion burner, 8:
Top-blowing nozzle, 9: Porous plug, 1O; Stirring gas feed pipe, 111': Air removal Patent applicant: Minamikyushu Chemical Industry Co., Ltd. Representative Patent Attorney Tsukasa Manno Tsukasa Figure 1

Claims (1)

[Scope of Claims] (1) A mixed composition of manganese ore and slag-making material is reduced to a metallic phase and a non-metallic phase by reducing at least the iron content in the mixed PA and animal using a reducing agent, The resulting non-metal phase manganese-containing oxide melt is charged into a reaction vessel having a side-blowing or bottom-blowing nozzle, and then the non-carbonaceous reducing material is entrained in a carrier gas and blown into the reaction vessel through the nozzle. in,
A method for producing low-carbon ferromanganese, which is characterized by reacting both. (2. Low carbon ferroyangane f/manufacturing method in which the manganese-containing molten material in claim 1 is a slag used in producing ordinary groove gun iron, medium carbon ferromanganese, and low carbon ferromanganese)◇ (3) A method for producing low-carbon manganese iron according to claim 1 or 2, wherein the non-carbon reducing material is one or more of ferrosilicon, metallic silicon, or aluminum.