JP3381944B2 - Method for controlling shot grain ratio in rock wool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a shot grain ratio in rock wool, and more particularly, to a method for converting molten slag from a blast furnace into a fiber by a cotton making machine that uses centrifugal force to remove the fiber from a collecting chamber. The rock wool that controls shot particles contained in the discharged rock wool short fibers by adjusting the air suction amount of the blower by opening and closing a damper provided in the return line between the cyclone and the cotton collection chamber. The present invention relates to a shot grain ratio control method.

[0002]

2. Description of the Related Art Rock wool fibers (hereinafter referred to as rock wool
Called Le. In the production of (1), a method has been widely used in recent years in which molten blast furnace slag is used as a main raw material, and this raw material is stretched into fibers and made into cotton by utilizing the centrifugal force of a rotating mandrel of a cotton making machine.

The rock wool itself is used as a raw material for a spray heat insulating material and a ceiling sound absorbing board, and its processed product is used as an industrial heat insulating material, a building heat insulating material and the like. In these applications, that is, as a building material, the surface color of rock wool and its processed products, especially hue, brightness,
Hue and lightness are important factors in grading, and even if they are excellent in heat insulation, heat resistance and various other properties, if they fall outside a certain range, they will be used as interior materials for walls and ceilings of buildings and homes. Cannot be done, and the merchandise value is drastically reduced.

Further, the molten blast furnace slag is disclosed in, for example, JP-A-62-65950 and JP-A-1-83535.
As shown in the publication, the composition of the composition is adjusted in an electric furnace, and then stretched by the above-mentioned cotton-making machine to form fibers. However, in this way, the component adjustment in advance in the electric furnace is mainly to give viscosity, for example, as a property required for cotton making, especially for stretching by centrifugal force. However, when the rock wool fiber is produced by the above cotton maker, large shots are inevitably mixed. For this reason, even if the components are adjusted in an electric furnace prior to cottonmaking, the amount of large-diameter shots mixed cannot be controlled, and no method has been proposed for controlling the shot grain ratio in the rock wool.

[0005]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems. Specifically, by adding auxiliary raw materials for component adjustment in an electric furnace and melting and adjusting the components, the molten blast furnace slag is subjected to centrifugal force. When a rock wool fiber is produced by fiberizing the same, a part of the shot particles generated during the cotton making remains in the rock wool short fiber and is used as a return line for connecting the cyclone and the cotton collection chamber. We propose a method for controlling the shot particle ratio in a rock wheel that enables the collection and adjustment of shot particles by adjusting the damper provided in the.

[0006]

Means for Solving the Problems That is, according to the present invention, an auxiliary raw material for component adjustment is added, and the molten blast furnace slag having the components adjusted and melted is made into a fiber by a cotton making machine 5 using centrifugal force to make cotton. When the cotton wool is collected in the cotton collecting chamber 7 to produce rock wool short fibers, the lumps collected in the form of dumplings generated by the cotton maker 5 at the time of this cotton making are cut into pieces suitable for pneumatic delivery. And then discharged into a pneumatic discharge line 16 provided with a shot separator 9 and a cyclone 10. Next, in this pneumatic discharge line 16, a large-sized shot is settled and separated by a shot separator 9 and then shot. Large-sized shots are sampled at the sampling port 15 below the separator 9 and the cyclone 10
Damper of the return line 17 that connects the cotton collection chamber 7 with the cotton collection chamber 7.
The amount of sucked air is adjusted by adjusting the flow rate on the inlet side of the shot separator 9 to control the shot particles in the lock wheel.

The structure and operation of the means of the present invention will be described below with reference to the drawings.

The present inventors have investigated the cause of the fact that the fiber diameter greatly changes during the cotton-making process of rock wool fibers obtained when cotton is controlled by utilizing centrifugal force. Molten blast furnace slag fluctuates excessively even if its components are adjusted for rock wool fibers. For this variation, so-called shot grains become large when, for example, silica sand (SiO ₂ ) is small. On the other hand, when SiO ₂ is in a steady state, the proportion of shot particles falls within an allowable range, but in this range, a fiber diameter of about 500 μm is 0.8 to 0.9% by weight.
It is included in cotton making, and it is said to be 2% by weight or less according to Japanese standard.

More specifically, the shot grain is a so-called non-cotton portion in which the tip of a cotton-made thread is not fibrous and becomes round, but is a so-called non-cotton portion. -It falls in the form that mixed with Le. Although the mixed shot grains are slightly removed at the trommel portion described later, they are trapped between the fibers of the rock wool, and it becomes difficult to control the shot grain ratio in the rock wool. Therefore, the present invention controls this shot grain ratio in the air-transporting portion reaching the trommel.

That is, when a method of controlling the shot grain ratio was examined, if the shot grain amount captured by the shot separator provided in the pneumatic portion was detected, the shots mixed in the rock wool during cotton shaving were controlled. The present invention has been made based on the knowledge that an increase or decrease in the particle amount can be detected.By reducing or increasing the suction air amount in the air feeding portion in accordance with the increase or decrease in the shot particle amount, the rock wheel The shot grain removing function is adjusted, and with this, the shot grain ratio in the rock wool is controlled.

1 is an explanatory view showing an example of an apparatus used for carrying out the present invention, FIG. 2 is an explanatory view showing a main part of the apparatus of FIG. 1, and FIG. 3 is a damper opening. Degree and 10
It is a graph which shows the relationship with the amount of large shots per minute, and FIG. 4 is a graph which shows the relationship between the amount of cotton generation and the damper opening.

First, in FIG. 1 and FIG. 2, reference numeral 1
Is a primary electric furnace, 2a is an inclined gutter, 2b is an injection gutter, 3a is a molten blast furnace slag, 3b is a component adjusting molten blast furnace slag, 4 is 2
Next electric furnace, 5 cotton making machine, 5a foil, 6 vibrating conveyor, 7 cotton collecting chamber, 7a cotton collecting conveyor, 8 picker
(Cutting machine), 16 is a discharge line, discharge line 1
6 has a shot separator 9, a cyclone 10, a granulator 11, a trommel 12, a damper 13, a blower 14, and a sampling port 15.

In FIG. 1, the molten blast furnace slag 3 a is 1
In the secondary electric furnace 1, the auxiliary materials for component adjustment are added to adjust the components, and the components are supplied to the secondary electric furnace 4 through the inclined gutter 2a, where the temperature is controlled. Then, it is supplied from the pouring gutter 2b to the foil 5a of the cotton maker 5. The cotton collection chamber 7 is composed of a vibrating conveyor 6 and a cotton collection conveyor 7a. While passing through the foil 5a of the cotton making machine 5, the melted blast furnace slag 3b whose components have been adjusted is thinly stretched by centrifugal force based on rotation. Then, the rock wool fiber thus produced is collected in a collecting chamber 7 and picked by a picker (cutting machine) 8 by a collecting conveyor 7a.
The lumps collected in the lump state are conveyed to the, and cut into small pieces suitable for pneumatic transportation.

After that, it is pneumatically conveyed through the pneumatic discharge line 16, and during the pneumatic transportation, the rock wool short fibers are shot particles settled and removed by the shot separator 9, and then enter the cyclone 10. Then the granulator
Via 11 enters the trommel 12, where further small shots are removed.

At this time, for example, a large-sized shot of 3 to 5 mm is sampled below the shot separator 9 and is present in the return line 17 connecting the cyclone 10 and the cotton collecting chamber 7 depending on the amount of the collected shot particles. The amount of sucked air is adjusted by the damper 13 to control the amount of shot particles captured.

The carry-in amount of shot particles is set such that the cotton-making machine 5 according to Japanese Patent Application No. 4-218622, which is separately disclosed by the present inventors, is moved by wheels to approach or separate from the cotton-collecting chamber 7. During cotton making, you can adjust the amount of waist carry-in including shots to the cotton collection chamber. However, as in the present invention, it is easy to adjust the trapping amount by adjusting the suctioned air amount by the damper 13 provided in the return line 17 that connects the cyclone 10 and the cotton collection chamber 7. Further, as described above, it is possible to perform the adjustment after the cotton making and, at the same time, simultaneously control the generation amount during the cotton making.

The present invention will be further described with reference to the following examples.

[0018]

EXAMPLE The rock wool obtained by cotton making by the method shown in FIG. 1 was collected in the cotton collecting chamber 7 and accumulated on the cotton collecting conveyor 7a in the cotton collecting chamber 7. The accumulated rock wool discharged at the unend portion was cut into small pieces by a picker (cutting machine) 8 shown in FIGS. 1 and 2. Then, after passing through the discharge line, the large-sized shots were settled and removed by the shot separator 9, and then entered into the cyclone 10 and then into the trommel 12 via the granulator 11, where further small-sized shots were removed.

At this time, a large-sized shot of 3 to 5 mm is sampled by the sampling port 15 below the shot separator 9, and the cyclone 10 and the cotton collecting chamber are collected according to the captured shot amount (collected amount per unit time). The amount of suctioned air was adjusted by a damper 13 provided on a return line 17 connecting with the No. 7 and the inlet side flow rate of the shot separator 9 was controlled, and the carry-in amount of the large-sized shot in the lock wheel was controlled. The results are shown in FIGS. 3 and 4.

In FIG. 3, the vertical axis represents the shot amount collected by the shot separator, and the horizontal axis represents the damper opening according to the shot amount.

That is, the amount of shots collected is large in the rockwheel, so that the damper is used.
The flow rate of the air feeding part is reduced and the separation function of the shot separator 9 is strengthened while the shot amount mixed in the rock wheel is also small when the shot amount collected is small. Opening the damper opening as reducing
The separating function of the shot separator 9 was reduced to control the shot grain ratio in the rock wool.

FIG. 4 shows an example of control in which the damper opening control in FIG. 3 is also used. In the control according to FIG. 3, if the damper opening is excessively narrowed, a small cut is made in the duct of the air feeding portion. Since the locked rocks may be accumulated and the duct may be clogged, the damper opening control is
It must be done according to the amount of cotton. Therefore, as shown in FIG. 4, it is carried out under the condition that the air feeding state is normally secured according to the amount of cotton making, that is, the amount of rock wool to be fed by air. Instead, the control is carried out so as to fit within this area.

That is, as shown in FIG. 4, shot grains can be removed by carrying out the above control while determining the lower limit of the damper opening in the region 1.

[0024]

As described above in detail, according to the present invention, the auxiliary raw material for adjusting the components is added, and the molten blast furnace slag having the components adjusted and melted is made into a fiber by a cotton making machine using centrifugal force. When the rock wool short fibers are produced by collecting cotton in a cotton collecting room, the rock wool generated by the cotton making machine
The powder is cut by a picker cutting machine and discharged through a discharge line, and then a large-sized shot is settled and separated by a shot separator provided in this discharge line, and then the large-sized shot is sampled at a sampling port below the shot separator. The amount of sucked air is adjusted by the damper of the return line that connects the cyclone and the cotton collection chamber according to the amount, and the flow rate on the inlet side of the shot separator is controlled to control the product inside the lock wheel. It is characterized by controlling the shot grain ratio brought into the.

According to the present invention, the amount of shot grains mixed in the product rock wool can be controlled to be constant regardless of the change in the amount of shot grains under the cottonmaking condition, and the rock wool of a predetermined quality can be controlled. -Can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an apparatus used for carrying out the present invention.

FIG. 2 is an explanatory diagram showing a main part of the apparatus shown in FIG.

FIG. 3 is a graph showing a relationship between a damper opening degree and a large-grain shot amount per 10 minutes.

FIG. 4 is a graph showing a relationship between a cotton generation amount and a damper-opening degree.

[Explanation of symbols]

1 Primary electric furnace 2a inclined gutter 2b infusion gutter 3a Molten blast furnace slag 3b Composition adjustment molten blast furnace slag 4 Secondary electric furnace 5 cotton machines 5a foil 6 Vibration conveyor 7 cotton collection room 7a Cotton collecting conveyor 8 Picker (cutting machine) 9-shot separator 10 cyclones 11 Granulator 12 Trommel 13 damper 14 Blower 15 Sampling port 16 discharge line

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) C03B 37/04

Claims (2)

(57) [Claims] 1. A auxiliary materials for component adjustment was added, which dissolved, and fibers by manufacturing cotton machine 5 for manufacturing cotton molten blast furnace slag component adjusted by utilizing the centrifugal force, piled-up cotton in Atsumariwatashitsu 7 and Rokkuu - in making the Le short fibers, said at this manufacturing cotton
The lumps collected by the cotton maker 5 in the form of dumplings are cut so as to be suitable for pneumatic transportation , and the shot separator 9 and the support are cut.
The gas is discharged to the pneumatic discharge line 16 provided with the cyclone 10 and then , in the pneumatic discharge line 16
Serial Shottosepare - after the large shots precipitated isolated by motor 9, the Shottosepare - below the sampling port 15 of motor 9 performs sampling of large shots, the current cotton chamber and the cyclone 10 by the amount 7
A lock wheel characterized in that the amount of sucked air is adjusted by a damper of a return line 17 connecting with the control line, the flow rate on the inlet side of the shot separator 9 is adjusted, and the shot grains in the lock wheel are controlled. Shot grain rate control method inside. 2. The method for controlling a shot grain ratio in a rock wool according to claim 1, wherein the large grain shot has a diameter of 3 to 5 mm.