JPS6220810A - Pretreatment of molten iron on blast furnace hearth - Google Patents

Abstract

PURPOSE:To attain improvement in the reaction efficiency of a molten iron treating agent, the prevention of splashing and lowering of a dust collecting temp. by adding the above-mentioned agent from a long-sized lance of a molten iron pretreatment device installed on the hearth toward the molten iron in a torpedo car. CONSTITUTION:The treating agent 9 is added into the molten iron 4 in the torpedo car 6 from the hearth by using the long-sized lance 8 in the stage when the torpedo car 6 receives the molten iron 4 emitted from a tap hole 2 of a blast furnace 1 via a molten iron 4 spout 3 and a tilting spout 5. The lance 8 is supported and is made movable such as liftable and tiltable by proper means so that the lance can aim the point near the falling position of the molten iron 4. The treating agent 9 is added to the molten iron 4 in the torpedo car 6 after the charging position of the agent 9 is adjusted to meet the level of the molten iron in said car. The preliminary treatment of the molten iron in thus executed.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Application Field The present invention relates to a method for pre-treatment of hot metal in a blast furnace cast bed.
The present invention relates to a method for pre-treatment of hot metal in a blast furnace casting bed, which has good reaction efficiency between a treatment agent and hot metal.

Conventional Technology Many methods have been proposed for hot metal pretreatment methods such as desiliconization, desulfurization, and phosphorization in blast furnace casthouses. For example, (1) JP-A-58-130208 discloses that as shown in FIG. 3, hot metal 4 coming out of the tap hole 2 of the blast furnace 1 is hot metal t!
[3 and method of projecting the treatment agent 9 onto the hot metal in the hot metal sluice 3 or the tilting sluice 5 using the lance 8 during the process of receiving the pig iron into the l/bead car 6 via the tilting sluice 5, (2) JP-A No. 50-217 discloses a method of spraying a treatment agent 9 onto hot metal 4 in a hot metal trough 3 using a feeder 13, as shown in FIG. 4, (3) and JP-A No. 49-3441G The publication describes a method in which a feeder is used to spread the treatment agent at the upstream position of the hot metal trough 3, and a lance is used to project the treatment agent at the downstream position.

In method (2), the treatment agent is added onto the hot metal flowing through the hot metal trough by gravity falling from the feeder.
The reaction efficiency between the treatment agent and the hot metal is 10% or more lower than in the case of using a lance (1), and problems such as slag clogging in the tilting trough occur.

Further, in the case of the method (1) or (3), although the inefficiency is good, there are problems such as an increase in splash scattering and an increase in the temperature of the collected gas.

Problems to be Solved by the Invention The present invention aims to solve these problems, and in detail,
The purpose of the present invention is to propose a method for pretreatment of hot metal in a blast furnace casthouse, which has good reaction efficiency, can prevent splashing, and can suppress the collected gas temperature.

<Structure of the Invention> Means for Solving the Problems and Their Effects The present invention provides a method for pre-treating hot metal in a blast furnace cast bed in which a hot metal treatment agent is added to hot metal, and a hot metal pre-treating device installed in the cast bed. The method is characterized in that the hot metal treatment agent is added from a long lance toward the hot metal in the vicinity of the hot metal falling position in the torpedo car.

Hereinafter, the structure and operation of the means of the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing a method for controlling the amount of hot metal in a blast furnace casthouse according to the present invention, and FIG.
FIG. 3 is an explanatory diagram showing an example of the i-mode, FIG. 3 is an explanatory diagram showing an example of hot metal pretreatment by a conventional method, and FIG. 4 is an explanatory diagram showing another example of hot metal pretreatment by a conventional method. .

In the figure, numeral 1 is the blast furnace, 2 is the taphole, 3 is the hot metal trough, and 4
is hot metal, 5 is a tilting gutter, 6 is a torpedo car, 7 is a treatment agent driving tank, 8 is a long treatment agent driving lance, 8' is a driving lance, 9 is a hot metal treatment agent, 10 is a potper, 11 is a cast bed, 12 1 is a lance drive device, and 13 is a feeder.

In FIG. 1, when the hot metal 4 coming out of the taphole 2 of the blast furnace 1 is received into the torpedo car 6 via the hot metal trough 3 and the tilting TiM5, a long lance 8 is used to
A treating agent 9 is added to the hot metal in the bead car 6.

At this time, the lance 8 is made movable in accordance with the hot metal pouring bell in the torpedo car so that it can aim at the vicinity of the hot metal falling position, and can be moved in accordance with the level of hot metal in the torpedo car 6.

Therefore, by employing the method of the present invention, (a) it is possible to inject the treatment agent into the falling flow of hot metal or its vicinity, so it is possible to expect a reaction efficiency comparable to that in the case (1) above.

(b) Since the treatment agent is projected into the hot metal in a large-capacity container called a torpedo car, splashing outside the torpedo is reduced, and it is also advantageous in solving the problem of collected gas temperature.

(C) Since the depth of the iron bath can be made deep, it is also advantageous in terms of the basic unit of gutter material.

Benefits such as:

In addition, by combining the hot metal treatment in the bead car according to the present invention and the conventional method for hot metal treatment in the pouring or hot metal sluice, it is possible to eliminate S1- theory P・S or de-S This enables combined processing such as S1 and P.

In this case, in addition to the above advantages, (d) Improvement in the reaction efficiency of S removal due to high temperature and reducing atmosphere → reduction in the basic unit of S removal flux (e) High iron production [S]
Alternatively, reductions in operating costs can be expected due to the possibility of using low-cost raw materials due to [P] allowance.

Example Next, examples will be further described.

FIG. 2 shows an embodiment of the pretreatment of hot metal in a cast bed using torpedo force according to the present invention. Long lance 8 is lance drive 111
1 device 12, and can be moved up and down and tilted, and the processing agent injection position can be adjusted according to the level of hot metal in the torpedo car.

In this way, by injecting the hot metal treatment agent into the hot metal near the point where the hot metal falls, it is possible to improve the reaction efficiency of the treatment agent, prevent splash scattering, and suppress the dust collection temperature, and it is also possible to perform complex hot metal treatment in the cast bed. became.

<Effects of the Invention> As explained above, the present invention is characterized in that the hot metal treatment agent is added from the hot metal pretreatment device installed in the cast bed to the hot metal in the vicinity of the hot metal falling position in the torpedo car using a long lance. The present invention improves the reaction efficiency of the treatment agent, which has been problematic in the past, prevents the scattering of splashes, suppresses the dust collection temperature, and further improves the conventional method. By using hot metal treatment in a tilting runner or hot metal runner in combination with
Composite hot metal treatment such as I is possible, and low-part raw materials with high [3] or high [P] can be used. Reduction of operating costs / J
“I can look forward to it.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a cast bed hot metal pretreatment method according to the present invention, FIG. 2 is an explanatory diagram showing an example of an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing a hot metal pretreatment method according to a conventional method. FIG. 4 is an explanatory diagram showing another example of the conventional hot metal pretreatment method. Code 1...Blast furnace 2...Tapping port 3...Hot metal trough 4...Hot metal 5
・・・・・・Tilt gutter 6・・・・L-bead calf・・・・Processing agent injection tank 8・・・・・・Processing agent injection long lance 9・・・・・・
Hot metal treatment agent 10...Hopper 11...
... Castbed 12 ... Lance drive device 13 ... Feeder

Claims (1)

[Claims] In a hot metal pretreatment method in a blast furnace casthouse in which a hot metal treatment agent is added to hot metal, the hot metal treatment agent is added from a hot metal pretreatment device installed in the castbed through a long lance to the hot metal near the drop point in the torpedo car. A method for pretreatment of hot metal in a blast furnace casthouse, characterized by adding.