JP3701945B2 - Briquette for slag generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a briquette for charging a slag generating device capable of effectively reusing pulverized powder of an alumina grindstone obtained by pulverizing a used alumina (Al ₂ O ₃ ) grindstone.
[0002]
[Prior art]
In recent years, various technologies relating to waste disposal and reuse of used products have been proposed for realizing a recycling-oriented society. For example, briquette flocculent aggregates containing chips, oil and water generated when grinding ferrous metals such as bearing steel and carburized steel (hereinafter used as a concept including polishing, superfinishing polishing and lapping) And a technique for reusing it as a steelmaking raw material has been proposed (see, for example, Patent Documents 1 and 2).
[0003]
[Patent Document 1]
JP 2002-129248 A (page 2)
[Patent Document 2]
JP 2001-310259 A (page 2)
[0004]
[Problems to be solved by the invention]
With the proposed technique, it has become possible to effectively use the iron-based metal grinding chips that have been disposed of, but many are still disposed of. For example, there is a used alumina grindstone. Alumina grindstones are attached to various grinding machines and used for steel polishing, etc. Alumina grindstones that have finished their functions are usually collected by the manufacturer and then consigned to a waste disposal contractor for landfill disposal. This is the current situation. For this reason, from the viewpoint of effective use of resources and consideration for the environment, development of a recycling technique for used alumina grindstones is desired.
[0005]
This invention is made | formed in view of such a situation, The objective is to provide the briquette for slag production | generation apparatus injection | throwing-in which can reuse the used alumina grindstone effectively.
[0006]
[Means for Solving the Problems]
The inventors of the present invention have made extensive studies in order to effectively reuse used alumina grinding wheels. In the process, pay attention to the fact that slag fluidity modifiers mainly composed of alumina and sedatives for blast furnaces are used in equipment that generates slag such as blast furnaces. We repeatedly examined whether or not. As a result, the pulverized powder of the used alumina grindstone is not simply made into a solid material of a predetermined size, but the pulverized material of the used alumina grindstone and the flocculent aggregate containing the iron metal grinding powder and the grinding liquid If a brittle molded body formed by compression molding is reinforced with a solidifying aid or the like, instead of the conventional slag fluidity modifier or blast furnace sedative, It was found that it can be used together with them, and the present invention has been completed.
[0007]
That is, the briquette for charging the slag generator of the present invention (hereinafter also simply referred to as “briquette”) is a porous brittle molded body obtained by compression molding a molding composition containing the following (a) and (b): And a reinforcing portion for reinforcing the brittle shaped body.
(A) A ground powder of used alumina grindstone.
(B) A flocculent agglomerate containing ferrous metal grinding chips and grinding fluid.
[0008]
According to the above configuration, since the flocculated agglomerate containing ferrous metal grinding chips and grinding liquid is used together with the pulverized powder of the used alumina grindstone, and the reinforced portion is formed, the predetermined strength and shape are obtained. Maintainability is ensured. Moreover, since the pulverized powder obtained by pulverizing the used alumina grindstone is included, the slag has good fluidity when used in various apparatuses in which slag is generated. Therefore, it becomes a briquette which can reuse the used alumina grindstone effectively.
Here, in the present invention, the “slag generation device” is a general term for various devices that generate slag such as a blast furnace, and all the conventional slag fluidity modifiers and sedation agents for blast furnaces have been introduced. Including equipment.
[0009]
In the briquette described above, it is preferable that the reinforced portion is a reinforced layer formed in a layered manner on at least one of the surface below and on the surface of the brittle shaped body. When a layered reinforcing layer is provided below or on the surface of a brittle molded body that may collapse in this way, even if a crack occurs in the brittle molded body due to an impact during transportation, it is prevented from collapsing in advance. As a result, the shape maintainability is further ensured.
Here, in the present invention, “at least one of the subsurface and the surface of the brittle molded body” means that the reinforcing layer is formed on the inner side (under the surface) with the surface of the brittle molded body as a boundary. This includes the case where the reinforcing layer is formed on the outer side (on the surface) and the case where the reinforcing layer is formed on both the inner side (below the surface) and the outer side (on the surface).
[0010]
Said briquette WHEREIN: It is preferable that the said reinforcement | strengthening part contains the solidification adjuvant. In this case, a reinforced part (strengthening layer) can be easily formed, and a briquette having a high shape maintaining property is obtained.
In the above briquette, the solidification aid is preferably at least one selected from the group consisting of colloidal silica, sodium silicate, aluminum phosphate and asphalt emulsion. In this case, the reinforced portion (reinforced layer) can be easily and reliably formed, and the briquette has a higher shape maintaining property.
In the briquette described above, the solidification aid is preferably pulp sludge. In this case, the reinforced portion (reinforced layer) can be easily and reliably formed, and the briquette has a higher shape maintaining property. In addition, since pulp sludge, which is a waste product from a paper mill, is used, it becomes a briquette that further considers the effective use of resources and the environment.
[0011]
In the briquette, the content of the iron-based metal grinding chips is preferably set in the range of 1 to 60% by weight, and particularly preferably in the range of 40 to 50% by weight. In this case, a large amount of pulverized powder of an alumina grindstone can be contained, and a predetermined shape is maintained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view schematically showing a briquette according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof. The briquette B according to this embodiment has a cylindrical shape as a whole, and is composed of a porous brittle molded body Z and a reinforcing layer K as a reinforcing portion formed below the surface (inside).
[0013]
The brittle shaped body Z is a flocculent aggregate containing pulverized powder (component a) of a used alumina grindstone, grinding chips generated by grinding a ferrous metal, and a grinding liquid containing oil and moisture. The molding composition containing (component b) is compression-molded so as to have a cylindrical shape and a bulk density of 1.5 or more, preferably 1.5 to 3.0. This brittle molded body Z is configured as a porous brittle body having appropriate voids.
[0014]
As an alumina grindstone, what is used for grinding of various steels and is going to be disposed of is used. And such an alumina grindstone is grind | pulverized with a hammer etc. to make a pulverized powder. The content ratio of the pulverized powder of the alumina grindstone is preferably set in the range of 30 to 50% by weight with respect to the entire molding composition before compression molding in consideration of shape maintenance properties and the like.
[0015]
As the iron-based metal, one containing 0.2% by weight or more of carbon can also be used. Such iron-based metal grinding chips have large spring back and are difficult to solidify, but by applying compression molding, the influence of spring back at the time of compression molding is eliminated to remove the grinding chips. It can be sheared effectively and as a result solidification is possible. In addition, as a representative example of the grinding chips containing 0.2 wt% or more of carbon, grinding chips of bearing steel can be given. The content of the iron-based metal grinding chips is preferably set to 1 to 60% by weight, particularly preferably in the range of 40 to 50% by weight, with respect to the entire molding composition before compression molding. is there. This is because if the amount of grinding chips is small, the shape may not be maintained even if compression-molded into, for example, a cylindrical shape. Conversely, if the amount of grinding chips is large, the content of the pulverized powder of the alumina grindstone decreases.
[0016]
The reinforcing layer K has a higher strength and higher density than the inner side of the briquette B (brittle shaped body Z), and is formed in a layer shape. Such a reinforcing layer K can be formed, for example, by dipping in a liquid solidification aid or applying (coating) a liquid solidification aid and then drying. As the solidification aid, colloidal silica, sodium silicate, aluminum phosphate, asphalt emulsion, and pulp sludge are preferably used. By using these, a strong briquette B can be obtained in spite of containing the oil component derived from the grinding fluid and the pulverized powder of the alumina grindstone. Here, pulp sludge contains wood pulp, clayey clay, moisture, etc., and is an industrial waste discharged from paper mills. B can be provided. These solidification aids may be used alone or in combination of two or more. And it is preferable to use so that a solidification adjuvant may be 1-10 weight% with respect to the whole briquette B, Most preferably, it is the range of 5-10 weight%.
[0017]
The briquette B according to this embodiment can be manufactured as follows, for example. That is, first, as shown in FIG. 3, a cotton-like aggregate M (refer to S <b> 1 in the figure) containing ferrous metal grinding chips and grinding liquid is conveyed between the pair of rolls 2 while being conveyed by the belt conveyor 1. The pressure is compressed by sandwiching (see S2 in the figure), and the moisture and oil content, which are components of the grinding fluid contained in the cotton-like aggregate M, are preliminarily adjusted. However, there is a method of adjusting the moisture and oil content by simple air blowing or air compression. At this time, the flocculent aggregate M is preferably adjusted so that the water content does not exceed 50% by weight and the oil content does not exceed 10% by weight. Handling such as storage becomes easy.
[0018]
On the other hand, the used alumina grindstone is pulverized with a hammer or the like to obtain pulverized powder A (see S3 in the figure). Then, the pulverized powder A of the used alumina grindstone and the cotton-like aggregate M in which the water and oil contents are adjusted are mixed at a predetermined ratio to obtain a mixture C as a molding composition. (See S4 in the figure).
Subsequently, the obtained mixture C is compression-molded by a hydraulic press using the molding die 3 to obtain a brittle molded body Z (see S5 in the figure). At this time, the flocculent aggregate M is compressed so that the bulk specific gravity of the brittle shaped body Z is 1.5 or more. By this compression molding, the spiral fibrous grinding chips contained in the cotton-like aggregate M are sheared, and the pulverized powder A of the alumina grindstone enters the gaps between the sheared grinding chips. A mechanical pressure device using a ball screw or the like may be used.
[0019]
Next, as shown in FIG. 4, in the liquid solidification auxiliary D that has been poured into the tank 5 while being slowly conveyed by the belt conveyor 4 so that the resulting brittle shaped body Z does not collapse. Immerse (see S6 in the figure). Instead of conveying the conveyor, the brittle molded body Z may be accommodated in a pallet or the like and immersed in the liquid solidification aid D in a batch manner.
Thereafter, the briquette B (see S9 in the figure) can be obtained by curing (drying) the brittle shaped body Z (see S7 in the figure) impregnated with the solidification auxiliary D (see S9 in the figure). As a result of this curing, surplus solidifying auxiliary agent that has penetrated into the brittle molded body Z moves to the surface side and part of it evaporates, while the remainder remains on the surface side of the brittle molded body Z, and the surface side is inside. A reinforced layer K having higher strength and higher density than the side is formed. Thus, the intended briquette B is obtained.
[0020]
The briquette B according to the present embodiment obtained in this way uses a flocculent aggregate containing ferrous metal grinding chips and grinding fluid together with used alumina grindstone pulverized powder, and also forms a reinforced portion. Therefore, the predetermined strength and shape maintainability are ensured. Moreover, since it contains the pulverized powder (component a) of the used alumina grindstone, when it is put into a slag generator such as a blast furnace, the slag fluidity is improved. In addition, since it can be used in place of or together with the conventional slag fluidity modifier and sediment for blast furnace, the used alumina grindstone can be effectively reused and the used alumina grindstone is discarded. Since the amount of disposal can be reduced, it is environmentally friendly. Furthermore, since it is a dry solid having a predetermined dimension (for example, a cylindrical shape having a diameter of 40 to 70 mm and a height of 30 to 50 mm), even if it is put into the slag generation device, it does not scatter and rise, Occurrence of problems such as instability is also suppressed.
[0021]
In addition, as the shape of the briquette B according to the present embodiment, in addition to the cylindrical shape, the polygonal prism shape, etc., the peripheral portion has a rounded shape such as an egg shape, an almond shape, a rugby ball shape, etc. A substantially pillow shape in which the thickness gradually increases toward the portion may be used. By forming into such a shape, it is strong against a compressive load and hardly collapses, and it is difficult to cause partial breakage at corners and the like.
[0022]
Further, the briquette of the present invention is not limited to the case where the reinforcing layer K is formed below the surface of the porous brittle shaped body Z. For example, by applying (coating) a highly viscous solidification aid to the surface of the porous brittle shaped body Z to reduce the amount of penetration into the brittle shaped body Z, on the surface below and on the surface of the brittle shaped body Z. A reinforcing layer may be formed. Further, a reinforcing layer may be formed on the surface of the brittle shaped body Z by substantially eliminating permeation into the brittle shaped body Z by using a solidifying aid having a higher viscosity. Even if it is such a briquette, the fluidity | liquidity of slag can be made favorable by throwing into a slag production | generation apparatus and using it. For this reason, effective use of resources and consideration for the environment are realized.
[0023]
In addition, the briquette of the present invention may be produced, for example, by previously containing a solidifying aid in the molding composition, compression molding the molding composition, and curing (drying) the composition. . In this case, the solidified product of the solidification auxiliary agent remaining in the brittle shaped body is in a properly distributed state, which becomes a reinforced portion for strengthening the brittle shaped body. Such briquettes also ensure a predetermined strength and shape maintainability, as described above. Moreover, the fluidity of the slag can be improved. Therefore, it is preferable from the viewpoint of effective use of resources and consideration for the environment.
[0024]
【The invention's effect】
As described above, according to the briquette of the present invention, the predetermined strength and the shape maintaining property are ensured, and the slag fluidity can be improved when it is put into the slag generating device. The alumina grindstone is effectively reused. Moreover, since what was disposed of is used, it becomes environmentally friendly.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a briquette according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the briquette shown in FIG.
FIG. 3 is a schematic process diagram showing a process (up to compression molding) for manufacturing a briquette according to an embodiment of the present invention.
FIG. 4 is a schematic process diagram showing a process (after compression molding) for manufacturing a briquette according to an embodiment of the present invention.
[Explanation of symbols]
B Briquette D Solidification aid K Strengthening layer (strengthening part)
Z brittle shaped body

Claims (6)

It has a porous brittle molded body formed by compression molding a molding composition containing the following (a) and (b), and a reinforced portion for strengthening the brittle molded body. Briquette for slag generator.
(A) A ground powder of used alumina grindstone.
(B) A flocculent agglomerate containing ferrous metal grinding chips and grinding fluid. The briquette for slag production | generation apparatus injection | throwing-in of Claim 1 in which the said reinforcement | strengthening part is a reinforcement layer formed in at least one of the surface below and the surface of the said brittle molded object. The slag generating device charging briquette according to claim 1, wherein the reinforcing portion contains a solidification aid. The briquette for charging a slag producing apparatus according to claim 3, wherein the solidification aid is at least one selected from the group consisting of colloidal silica, sodium silicate, aluminum phosphate and asphalt emulsion. The briquette for slag production | generation apparatus injection | throwing-in of Claim 3 whose said solidification adjuvant is pulp sludge. The briquette for slag production | generation apparatus injection | throwing-in of Claim 1 by which the content rate of the iron-type metal grinding | polishing chip in the said composition for shaping | molding is set to the range of 1 to 60 weight%.

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