JPH03115518A - Method and apparatus for charging alloy iron of converter - Google Patents

Abstract

PURPOSE:To standardized the charging operation of the alloy iron during tapping from a converter and to reduce the initial cost of the device and to improve the yield thereof by detecting the level of the molten steel surface in a molten steel ladle during tapping and charging alloy iron for component adjustment in accordance with detection information. CONSTITUTION:A sensor 9 for detecting the molten steel level in the molten steel ladle 4 by a laser beam or microwaves or ultrasonic waves is provided at one point on the molten steel ladle 4. The sensor 9 for detecting the molten steel level emits the microwaves to the molten steel level in the molten steel ladle 4 under tapping from the converter 1, measures the time by detecting the reflected waves from the molten steel surface and measures and detects the molten steel level from this time. The output information of this sensor 9 is inputted to a controller 10 and necessary computation is executed in the controller 10 in accordance with this information. A feeder 7 for charging the alloy iron is controlled in accordance with the result of the computation. As a result, the need for installing a weighing machine is eliminated and all the operations are automatically executed. There is no need for an operator's aid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to converter refining, particularly to a method of charging ferroalloy to a converter and an apparatus therefor.

[Conventional technology] Oxygen is injected into the hot metal produced by a blast furnace for steelmaking in a converter, so-called blowing is carried out to decarburize the C in the hot metal, and refining processes such as deoxidation, desulfurization, and dephosphorization are performed. Finally, the composition of the steel is adjusted to a predetermined value using a composition adjuster, and a ferroalloy deoxidizer is added to adjust the amount of oxygen to ensure the desired quality of the steel. .

Common ferroalloy component regulators include ferromanganese, silicon manganese, silicon iron, ferrochrome,
There are carburizing agents and the like (in the present invention, the component adjusting agent is referred to as ferroalloy).

In addition, when introducing these ferroalloys, a weighing machine 3 is installed on the molten steel cart 2 as shown in Fig. 2, and during tapping from the converter 1, the ferroalloys for composition adjustment are used based on the information on the weighed value. 5
A method has been adopted in which the molten steel is charged into the molten steel ladle 4 from an input hopper 6 via a feeder 7 and an alloy iron input chute 8. In the figure, 11 is molten steel and 12 is slag.

[Problems to be Solved by the Invention] In the case of the conventional method of introducing ferroalloy as described above, (1) equipment costs are high;

■There are disadvantages such as maintenance problems such as molten steel scattering during tapping from the converter and failure of the weighing machine on the molten steel trolley.
These improvements have been desired.

The present invention solves the above problems by providing low equipment costs, good maintainability, and short recovery time in the event of a breakdown.
The object of the present invention is to provide a method for charging ferroalloy to a converter and an apparatus therefor.

[Means for Solving the Problems] The method of the present invention, in converter blowing, detects the level of the molten metal surface of the molten steel pot being tapped from the converter, and adjusts the alloy for composition adjustment based on the detected information. This is a method of charging ferroalloy to a converter, characterized by charging iron into the pot.

Further, the apparatus of the present invention for carrying out the above method is a ferroalloy charging device for converter refining, which includes a level sensor of the molten steel ladle surface and a ferroalloy input amount calculator for component adjustment that calculates based on the detection signal of the sensor. A ferroalloy charging device for a converter is characterized by comprising: and a ferroalloy charging feeder control device based on the calculated signal.

Furthermore, in the method and apparatus described above, laser light, microwaves or ultrasonic waves are used in the method and apparatus for detecting the level of the molten steel ladle.

[Function] In the ferroalloy charging method and device of the present invention, a scene detection sensor using laser light, microwaves, or ultrasonic waves is fixed at a fixed location on the molten steel ladle to detect the level of the molten steel in the molten steel ladle. Alternatively, time can be measured by emitting ultrasonic waves and detecting reflected light or reflected elastic waves from the surface of the hot water. From this, the level of the hot water can be measured, and the timing and amount of ferroalloy to be added can be determined by the controller, making it more accurate and accurate. It is possible to measure without being affected by high temperature or environment.

Next, embodiments of the present invention will be described.

[Example 1] FIG. 1 is an explanatory diagram showing a method of charging ferroalloy to a converter according to the present invention.

In the figure, 1 is a converter, 2 is a molten steel truck, and 3 is a weighing machine 14.
5 is a molten steel ladle, 5 is a ferroalloy, 6 is a charging hopper 7 is a feeder 18 is a ferroalloy charging chute.

9 is a scene detection sensor, 10 is a controller (calculating unit) 111 is molten steel, and 12 is a slag.

As shown in the figure, a sensor 9 for detecting the hot water level of the molten steel ladle 4 using laser light, microwaves, or ultrasonic waves is provided at a certain location on the molten steel ladle 4.

Regarding the level of the molten steel ladle 4 during tapping from the converter 1,
A hot water level detection sensor (using microwaves) 9 emits microwaves, detects reflected waves from the hot water surface, measures time, and measures and detects the scene level from this time.

Next, the output information of the scene detection sensor 9 is input to a controller (calculating unit) 10, and based on this information, the controller 10 performs necessary calculations, and the ferroalloy input feeder 7 is controlled based on the calculations.

Next, we will discuss a specific example of the method of charging ferroalloy when producing cold-rolled steel sheets for automobiles in a converter with a capacity of 250T.

First, before tapping the steel in the converter, the lower limit value of the molten steel ladle is measured in advance using the hot water level detection sensor 9.

Next, along with the converter tapping, the molten steel ladle shown below (dimensions height 45
00 x diameter 4800. Various ferroalloys are charged into the molten steel ladle 4 from the charging hopper 6 via the feeder 7 and the ferroalloy charging chute 8 according to the instructions of the hot water level (capacity 290T) 4.

In this case, the carburizing agent is used for C adjustment, ferrosilicon is used for deoxidation and SL adjustment, aluminum is used for deoxidation, and higher ferromanganese is used for deoxidation and Mn adjustment. It is added into the molten steel ladle 4 according to the following.

In this embodiment, microwaves are used as the scene detection sensor for the molten steel ladle 4, but it goes without saying that laser light or ultrasonic waves may also be used.

As described above, when charging the ferroalloy to the converter, the level of the molten steel ladle surface being tapped from the converter is detected using laser light, microwaves, or ultrasonic waves, and based on the detected information, the level of the molten steel ladle surface is detected. Since the ferroalloy is put into the molten steel ladle, there is no need to install a weighing machine in the conventional method.

Additionally, this process is entirely automatic and does not require operator intervention.

[Effects of the Invention] According to the method and apparatus for charging ferroalloy to a converter of the present invention,
The ferroalloy charging process during converter tapping is standardized, equipment costs are lowered, yields are improved, steelmaking time is reduced, composition deviations from specifications are prevented, and labor is saved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a method of charging ferroalloy to a converter and its apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional method of charging ferroalloy to a converter. In the figure, 1: converter, 2: molten steel trolley, 3: weighing machine, 4
: Molten steel ladle, 5: Ferroalloy, 6: Input hopper 7: Feeder, 8: Ferroalloy input chute. 9: Hot water level detection sensor 10: Controller (calculator), 11: Molten steel, 12 Nisslug.

Claims (4)

[Claims] (1) In the method of charging ferroalloy for converter refining, when tapping the steel from the converter to the molten steel ladle, the level of the molten metal surface of the molten steel ladle during tapping is detected, and based on the detected information, the A method of charging ferroalloy to a converter, comprising charging ferroalloy into the pot. (2) The method for charging ferroalloy to a converter according to claim 1, wherein the level of the molten steel ladle is detected using laser light, microwaves, or ultrasonic waves. (3) In a ferroalloy charging device for converter refining, there is a level sensor for the molten steel ladle level, a ferroalloy input amount calculator for component adjustment that is calculated based on the detection signal of the sensor, and a ferroalloy input amount calculator that is operated based on the signal from the calculator. A ferroalloy charging device for a converter, comprising a charging feeder control device. (4) The ferroalloy charging device for a converter according to claim 3, wherein the level sensor for the molten steel ladle surface is a level sensor using laser light, microwaves, or ultrasonic waves.