JPS5910621Y2 - Molten slag sample collection device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for collecting molten slag samples in a steelmaking furnace such as a converter, and in particular, only a molten slag sample during or immediately after blowing can be collected by molten slag in the furnace. This relates to an apparatus that collects a slag layer while checking it, and provides a good molten slag sample for analysis without re-oxidation or contamination after collection.

Slag is an essential medium for promoting steelmaking reactions in steelmaking operations, especially during blowing, and by analyzing and measuring the slag fraction, it is possible to estimate various fractions in molten steel. This is a very important source of information.

Additionally, it is known that an increase in iron oxide in the slag increases the erosiveness of the refractory materials that make up the furnace wall, so it is important to quickly understand changes in the slag content when operating the furnace. is also very important.

For this reason, a number of devices have been developed for collecting molten slag, but since no method has been devised to ensure that the device stops at the molten slag layer, It was difficult to collect only the molten slag because metals were also collected.

Furthermore, the problem of re-oxidation and contamination after the molten slag sample is collected and before it is taken out of the furnace for recovery could not be adequately addressed.

For example, Japanese Utility Model Publication No. 49-24456 discloses a sampler for molten material such as slag, which consists of inserting a metal heat-resistant material around the outer periphery of a bar made of a paper tube or the like.

Although this device is simple and widely used in field applications, it still has the drawbacks mentioned above.

That is, if the device is not equipped with a means for generating a signal for immersion braking, there is a possibility that molten metal will be mixed in the collected sample due to an error in setting the immersion depth.

Furthermore, even if such problems can be avoided, the collected sample will be directly exposed to the atmosphere inside the furnace, and there is a risk that dust in the atmosphere will adhere to and contaminate the sample, and furthermore, the sample will be reheated by the furnace heat. There remains a risk of oxidation or deterioration.

In addition, since there is a possibility that the sample may be directly affected by harmful gases that alter the quality of the sample, a more reliable slag sampling device has been desired.

In view of the above points, the device based on this idea is capable of collecting only the molten slag by incorporating a molten slag layer sensor that provides an electric signal to automatically stop the device at the molten slag layer position. It is something to do.

That is, when the molten slag flows into the container from the inlet provided in the upper side wall of the molten slag sample collection container, the molten slag is polarized and each The present invention provides a molten slag sample sampling device characterized in that a molten slag layer sensor is provided with electrodes separated from each other.

In use, the molten slag layer sensor is connected to an external electrical signal processing device, which enables drive control of the means for raising and lowering the molten slag sampling device within the furnace (for example, a sub-lance in a converter). I'll leave it as is.

As the molten slag sampler descends, it first reaches a layer of molten slag located above the molten metal.

Since the slag is an electrical conductor, it is interposed between the molten slag layer sensor elements of the device to form a closed electrical circuit.

The change in the electrical signal value at this time is detected by a known electrical signal processing device, the descent of the lifting device is immediately stopped, and the necessary and sufficient molten slag sample is allowed to flow into the container from the sample inlet and then pulled up. A sample of only molten slag suitable for chemical analysis is taken.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

In the figure, A is a container for collecting a molten slag sample, and the upper peripheral wall of this container A is provided with an inlet 1 through which the molten slag sample flows.

Based on research on the specific gravity, viscosity, solidification characteristics, etc. of molten slag, the diameter of the inlet 1 has been determined to be relatively large compared to known molten metal sampling devices (for example, the diameter of container A is 5 mm).
0mm vs. 40mm), the inflow will be smooth.

The container A is designed such that the molten slag sample flowing in from the inlet 1 is rapidly cooled and immediately starts solidifying in the container A.
It is preferable to use a material that is durable and has high thermal conductivity, such as metal such as steel, iron, or cast metal.

Further, in order to facilitate the removal of the solidified sample, it is preferable that the container A be made into a split type.

To set the container A, connect it to the lower end of the paper tube 2, and fit a cover 3 made of the paper tube so that it fits over the container A and the lower end of the paper tube 2. This cover 3 is provided with an opening 4 that coincides with the inlet 1.

Note that the openings 4 are in an open state communicating with the outside air, or they are covered with a thin film to prevent dust from entering during storage. It is left in a substantially open state.

B is a sensor for detecting the presence of a molten slag layer, and in FIGS. 1, 3, and 4, each electrode is separated from the other to increase the distance between the electrodes. shows different embodiments.

In the case of FIG. 1, the molten slag layer detection sensor is comprised of a pair of conductive (for example, metal) wires 5 and 6, forming a counter electrode in an open circuit state.

These wire rods 5 and 6 are installed at opposing positions along the sample collection container cover 3, as shown in cross section in FIG.

One end 5 of the counter electrode is arranged so that it projects from above the container near the center of the opening 4 of the sample collection container cover 3, and the other end 6 is arranged so that its end is near the opposing position. Ru.

As mentioned above, as the sampling device descends inside the furnace, the tip of the device is immersed into the molten slag layer.

Since slag is an electrical conductor, when the electrodes from the wires 5 and 6 touch the molten slag, a closed circuit is created here, and a known means (
For example, the presence of the molten slag layer can be confirmed by means of sending a constant electrical signal from the open circuit state and detecting electrical displacement during the closed circuit state.

At this point, the device stops lowering as described above.

In this case, since the molten slag surface is located near the end of the counter electrode, only molten slag flows into the molten slag sample collection container A from the inlet 1 after the apparatus is stopped.

The inflowing slag sample is cooled in container A and begins to solidify.

When the slag sample that has flowed into container A is pulled up, the portion above the lower edge of the inlet port flows out and is reduced somewhat, but in the device based on this idea, the inside of the sample collection container communicates with the outside air. There is only one part of the inlet,
Since the other parts are surrounded by a certain sample collection container cover 3 made of a highly insulated paper tube, etc., the container A is maintained at approximately room temperature before the sample slag flows in, and the inlet port 1 Due to the cooling effect of container A, the slag flowing in through the container A adheres to the inner wall of the container, is cooled, and begins to solidify.

Since container A is insulated in this way, the heat inside the furnace is not directly transmitted to the collected sample, preventing troubles such as oxidation or deterioration of the sample due to reheating, and the atmosphere inside the furnace The collected sample is effectively protected from the adhesion or contamination of dust, etc., or the influence of harmful gases that alter the quality of the sample.

In the case of Fig. 3, the molten slag layer detection sensor is constructed by joining a wire 5 to a metal container, using the metal container itself as one pole, and using the other end of the wire 6 as the tip of the molten slag sampling device. By making the electrodes protrude in the immersion direction, the pair of electrodes are kept in an open circuit state.

When the molten slag sampling device is lowered, the electrode protruding from the tip of the device is first immersed in the molten slag layer.

At this stage, the closed circuit has not yet been established, so the device continues to descend.

Eventually, when the molten slag surface reaches the inlet portion, the molten slag comes into contact with the edge of the inlet 1 of the molten slag sample collection container A or the wall surface of the container body.

At this point, a closed circuit is established through the molten slag, and a sample of only the molten slag is taken in the same manner as in the embodiment of FIG.

Note that even if the electrode protruding from the tip of the device exceeds the molten slag layer and reaches the molten metal layer, there is no problem with the closed circuit structure described above since both the slag and molten metal are conductors.

In the case of Fig. 4, one of the counter electrodes 5 of the molten slag layer detection sensor is configured to protrude upward from the bottom wall surface of the molten slag sample collection container A, and the other side 6 is used to collect the molten slag sample. In such a way that it protrudes from the tip of the device in the immersion direction,
A pair of open circuit electrodes is formed.

This is suitable when the molten slag sample collection container A is made of a non-conductive material.

Molten slag sampling is performed in substantially the same manner as in the embodiments of FIGS. 1 and 3.

However, since the closed circuit type requires a certain point in time for the molten slag to flow into the molten slag sample collection container A and make sure to contact the electrode protruding from the bottom of the container A, this method is difficult to detect the slag layer. In order to avoid delays, it is necessary that the slag has sufficient fluidity.

The embodiments shown in FIGS. 3 and 4 are particularly suitable for use under conditions where abnormal signals are likely to occur due to scattering of molten slag in the furnace, such as slopping.

According to the molten slag sampling device having the above configuration,
Since the exact position of the slab layer can be determined, it is possible to easily collect samples for analysis of only slag without contamination with molten metal, and the only part where the inside of the sample collection container communicates with the outside air is the inlet part. The other parts are surrounded by a highly insulated sample collection container cover, so the container is maintained at approximately room temperature before the sample enters, and the slag flowing in through the inlet is coated on the inner wall of the container by the cooling effect of the container. It adheres, cools and begins to solidify.

Since the container is insulated in this way, the heat inside the furnace is not directly transmitted to the collected sample, which prevents problems such as oxidation or deterioration of the sample due to reheating, and also prevents problems such as oxidation or deterioration of the sample due to reheating. The collected sample can be effectively protected from the adhesion and contamination of dust and the influence of harmful gases that alter the quality of the sample.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of an embodiment of the device according to this invention, Fig. 2
The figure is a cross-sectional plan view of the same as the above, and FIGS. 3 and 4 are vertical cross-sectional front views showing different embodiments of the device according to the invention. A... Molten slag sample collection container, B... Slag layer sensor, 1... Inflow port, 2... Paper tube, 3... Sample collection container cover 4... Opening, 5, 6. ...Conductive wire (electrode).

Claims (1)

[Scope of utility model registration request] An electrical closed circuit is formed by interposing the slag between the molten slag collection container, which has an open inlet port that communicates with the outside air on the upper side wall of the container body, and a pair of electrodes having a polarized structure and which are spaced apart from each other. 1. A molten slag sample sampling device, characterized in that it is integrally constructed with a sensor for detecting a shaped slag layer.