JPS6134111A - Adding method of molten pig iron treating agent - Google Patents

Abstract

PURPOSE:To accelerate the reaction due to through contact of a treating agent, by accelerating a powdery granular agent for treating molten pig iron, falling in a gate, in addition of said agent to bath surface of molten pig iron flowing down through a molten pig iron spout by belt conveyer through the gate. CONSTITUTION:A desiliconizing agent 4 carried by a supplying conveyer 6 and supplied onto the gate 7 is accelerated downwardly by an impeller (or accelerating nozzle) 9, and entered forcibly into the molten pig iron 2 flowing in the molten pig iron spout 1. Thereby, projecting area of the agent 4 can be enlarged, and it is far advantageous in reaction efficiency and unit of the agent 4. By this method, since pretreating reaction by the agent 4 as typical instance can be progressed rapidly in the vicinity of the agent adding position, the reaction is not carried over to the torpedo car, and slag forming problem can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The technical content described in this specification as part of the improvement of a continuous hot metal pretreatment method is particularly aimed at improving sufficient contact of a treatment agent with hot metal flowing down through a hot metal trough in a blast furnace casthouse. (Background technology) Preliminary treatment of hot metal in a castbed prior to steelmaking operations. Attempts have been made to cut it out and add it to hot metal, or to drive it into hot metal using a nozzle using a carrier gas.

However, when pre-treatment of hot metal is carried out in such a cast bed,
In particular, in the former case, if the reaction with the first agent is carried over to the torpedo car, slag forming will occur near the receiving port of the torpedo car, making it difficult to judge the amount of hot metal in the torpedo car, and reducing the amount of hot metal per torpedo car. In this respect, the latter method is not as convenient as mentioned above, but on the other hand, it requires a large amount of carrier gas and requires a large amount of power to add the desiliconizing agent. Due to the spraying, the newly sprayed Hk silicone is accumulated on the bath surface (objective of the invention) This invention improves the pretreatment method in consideration of the above situation and solves the problem. The purpose is to resolve the matter favorably.

(Structure of the Invention) This invention uses a belt conveyor as a conveying means to add a granular hot metal treatment agent to the surface of a hot metal bath in a continuously flowing hot metal trough via a gate. A method for adding a hot metal treatment agent, which comprises accelerating the discharged hot metal treatment agent by a rotary impeller or an accelerating gas nozzle in the process of falling into a gate, thereby causing the treatment agent to penetrate into the hot metal. be.

Figures 1a and 1b illustrate the procedure for adding the hot metal treatment agent according to the present invention. In the figure, 1 is the hot metal sluice, 2 is the hot metal, 3 is the hopper,
4 is a desiccant agent, 5 is a feeder, 6 is a delivery conveyor, 7 is a gate, and 8 is a tilting gutter.

According to the present invention, desiliconizing agent 4 conveyed by a discharging conveyor 6 and discharged on a gate 7 is accelerated downward by a rotary impeller 9 and forced to enter into hot metal 2 flowing in a hot metal trough 1.

By accelerating the desiccant agent 4 discharged by the conveyor downward, in the conventional method shown in FIG. Because the hot metal ta1 was simply falling into the continuously flowing hot metal 2, the reaction between the desiliconizing agent 4 and the hot metal 2 proceeded only at the interface, resulting in a slow reaction rate. This can be avoided by accelerating the penetration into the hot metal.

On the other hand, in the conventional method shown in FIG.
Compared to the case where the desiccant agent 4 was injected through the injecting nozzle 12 using the carrier gas 11, the projection area of the desiccant agent can be made much larger, and the reaction efficiency and basic unit of the desiccant agent are greatly improved. advantageous to

As shown in Fig. 1, by making each blade of the impeller 9 a back vane, it is possible to cancel the velocity in the longitudinal direction of the dispensing conveyor 6 when the desiccant agent 4 leaves the dispensing conveyor b. This makes it possible to effectively accelerate the desulfurizing agent 4 downward by the impeller 13.

In addition, FIG. 4 and FIG. 5 show the transition of the silicon element in the pig iron in the conventional hot metal desiliconization treatment method shown in FIGS. 2 and 3,
Although the method according to Fig. 3 is more suitable than the method shown in Fig. 5 because the desiliconization reaction proceeds more rapidly near the desiliconizing agent addition point compared to the method shown in Fig. 2, it has the disadvantages mentioned above. This was unavoidable.

Further, FIGS. 6 and 7 show an example of a method for accelerating a desiccant agent according to the present invention. The hot metal is forced to enter the hot metal 2 by applying acceleration by the acceleration gas 14 blown out from the sagi impeller 9.
The same effects can be expected.

(Effects of the Invention) Since the physical reaction can proceed rapidly in the vicinity of the treatment agent addition position, the reaction is not carried over to the torpedo car, making it possible to avoid the problem of slag forming.

[Brief explanation of drawings]

FIGS. 1a and 1b are perspective views and side views showing an embodiment of the hot metal desiliconization method according to the present invention, and FIGS. 2 and 3 are perspective views showing an example of the conventional top type and blowing type hot metal desizing methods. , Fig. 4 is a graph showing the transition of the silicon content in the hot metal, Fig. 6 is a side view showing a specific example of the hot metal removal method according to another method of the present invention, and Fig. 7 is a plan view thereof. Figure 1 (b) Figure 2 Figure 4 Sun-Ang Sign Figure 6 Figure 7 Procedural Amendment (Method) % Formula % 1. Indication of Case 1982 Patent Application No. 79815 2. Invention Name Addition method of hot metal treatment agent 3, Relationship with the case of the person making the amendment Patent applicant (125 N Kawasaki Steel Co., Ltd. 5, Date of amendment order August 27, 1985 6 Amendment (7) vs. 'J Specification In Column 1 of "Brief Description of Drawings", page 6, line 10 of the specification, "Figure 4 is" changed to "
Figures 4 and 5 have been corrected to ``.

Claims (1)

[Claims] 1. When adding a granular hot metal treatment agent to the surface of a continuously flowing hot metal bath through a gate using a belt conveyor as a conveying means, A method for adding a hot metal treatment agent, which comprises accelerating the hot metal treatment agent with a rotary impeller or an accelerating gas nozzle during the process of dropping into a gate, thereby allowing the treatment agent to penetrate into hot metal.