JP2002180108A - Brittle compact and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brittle compact with which grinding swarf can be effectively recycled and also to provide its manufacturing method. SOLUTION: A flocculent agglomerate B which contains grinding swarf of ferrous metal and grinding fluid containing oil and water is compacted to prepare a brittle compact A where the grinding swarf in a fibrous state is sheared and excess water and oil are removed. It is effective to carry out the compaction of the brittle compact while using an auxiliary agent for solidification, such as colloidal silica, sodium silicate, aluminum phosphate and asphalt emulsion, or to impregnate the compact with the auxiliary agent for solidification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brittle compact and a method for producing the same, and more particularly, to a technique for effectively using ground metal chips of a ferrous metal.

[0002]

2. Description of the Related Art Chips generated when grinding ferrous metals such as bearing steel and carburized steel (hereinafter used as a concept including polishing, superfinishing and lapping) are grinding fluids containing water and oil. And a flocculent (fibrous) aggregate containing abrasive grains and the like. Since this flocculent aggregate contains a large amount of pure iron, it has been attempted to reuse it as, for example, a steelmaking raw material. However, since this flocculent agglomerate contains a large amount of water, if it is put into a blast furnace as it is, the water causes a problem of bumping (steam explosion). Therefore, it is conceivable to remove the water in the flocculent aggregate by centrifugation or the like.In this case, the oil contained in the flocculent aggregate is also removed together with the moisture, and the flocculent aggregate naturally generates heat. Pure iron, which is a component of grinding chips, is transformed into iron oxide. For this reason, in order to reuse this as a steelmaking raw material, it is necessary to reduce it, and the use of a reducing agent increases costs.

[0003] In addition, since the above-mentioned ground chips to which the oil component adheres hardly adhere to each other, it is difficult to solidify to a desired strength even if the flocculent aggregate is compression-molded. Further, the flocculent agglomerate containing a large amount of ground cuttings of an iron-based metal having a carbon content of 0.2% by weight or more has a large springback at the time of compression. It is difficult to solidify strongly. Therefore, even if the compression-molded flocculent aggregate is put into a blast furnace, it flies up while scattering and is mostly collected by the dust collector. Furthermore, since the fibrous ground chips contained in the flocculent aggregate are difficult to pulverize with a hammer mill or the like, the flocculent aggregate cannot be finely sheared into powder. For this reason, it is also difficult to process the flocculent aggregate into an egg-shaped briquette or the like. Therefore, the actual state is that the flocculent aggregate is disposed of by a waste disposal contractor without being reused.

[0004]

However, such landfill disposal of flocculent aggregates is not preferable from the viewpoint of effective utilization of resources. In addition, there is a problem that the environment is deteriorated and the disposal cost is high. The present invention has been made in view of the above problems, and an object of the present invention is to provide a brittle molded body that can effectively reuse ground chips and a method of manufacturing the same.

[0005]

The brittle compact of the present invention for achieving the above object is characterized by forming a flocculent agglomerate containing a grinding chip of an iron-based metal and a grinding fluid containing oil and moisture into a predetermined shape. (Claim 1). According to the brittle molded body configured as described above, since the flocculent agglomerate is formed by compression molding, the fibrous ground cutting chips are brittle by shearing. Further, the oxidation of pure iron, which is a component of the grinding chips, by the remaining oil is prevented.

The brittle molded article may be solidified with a solidification aid (claim 2). In this case, the brittle molded article can be solidified to a desired strength. The solidification aid is preferably at least one selected from colloidal silica, sodium silicate, aluminum phosphate, and asphalt emulsion (claim 3). It becomes a brittle molded body that has been solidified. The oil content of the brittle molded product is 1 to
Preferably, the content is 5% by weight (claim 4). In this case, while being solidified to an appropriate hardness, pure iron which is a component of the grinding chips is oxidized by a minimum residual oil content. Can be effectively prevented.

[0007] Further, the method for producing a brittle molded article of the present invention comprises:
Compression molding of flocculent agglomerates containing iron-based metal grinding chips and a grinding fluid containing oil and moisture, a predetermined shape in which fibrous grinding chips are sheared and excess moisture and oil are removed (Claim 5). According to the manufacturing method of the brittle molded body configured as described above, the compression molding of the flocculent agglomerates can easily shear the fibrous ground chips which have conventionally been difficult to shear. Further, since the compression molding is performed while retaining the oil content contained in the grinding fluid, it is possible to prevent the pure iron, which is a component of the grinding chips, from being oxidized.

The method for producing a brittle molded product may further include a step of impregnating the brittle molded product with a solidification aid (claim 6). In this case, the brittle molded product is solidified to a desired strength. A brittle molded article can be obtained. As the solidification aid, it is preferable to use at least one selected from colloidal silica, sodium silicate, and aluminum phosphate asphalt emulsion (claim 7), whereby the solidification is enhanced even though oil is contained. A brittle molded article can be obtained. Further, it is preferable that the solidification aid is impregnated with 2 to 30% by weight (claim 8), whereby a brittle molded product which is more solidified can be obtained.

In the method for producing a brittle molded article, it is preferable to use the flocculent aggregate which has been adjusted to a water content not exceeding 50% by weight and an oil content not exceeding 10% by weight. Preferred (claim 9). This facilitates handling such as transportation of the floc and the like, and allows easy and appropriate removal of excess moisture and oil content of the brittle molded body only by compression molding.

In the method for producing a brittle molded product, the brittle molded product has a water content of 2 to 12% by weight and an oil content of 1 to 12% by weight.
It is preferably adjusted to 5% by weight (claim 10). In this case, the brittle molded body can be solidified to an appropriate hardness, and the oxidation of pure iron, which is a component of the grinding chips, can be effectively prevented by the minimum residual oil content. . Further, as the grinding chips, those containing 0.2% by weight or more of carbon may be used (claim 11).
The effect of the springback can be eliminated to achieve effective shearing by the compression molding.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a process chart showing a method for manufacturing a brittle molded body according to one embodiment of the present invention. In the production of the brittle compact A, first, the flocculent aggregate B (see FIG. 1 (a)) of the grinding chips generated when the ferrous metal is ground is compressed under pressure, and the flocculent coagulate B is formed. Gather B
Preliminarily adjust the contents of water and oil, which are components of the grinding fluid contained in the above. The pressurization and compression of the flocculent aggregate B is performed, for example, by a pair of rolls 2
It is performed by being sandwiched between them (see FIG. 1 (b)). However, there is a method of adjusting the water content and the oil content by simple air blowing or air compression. At this time, the flocculent aggregate B
Means that the oil content is not more than 50% by weight and the oil content is 1
It is preferable to adjust each of the amounts so as not to exceed 0% by weight, so that handling such as transportation and storage of the flocculent aggregate B becomes easy.

Next, the flocculent agglomerate B having the adjusted water and oil content is compression molded by, for example, pressing using a molding die 3 to obtain a brittle molded body A (see FIG. 1 (c)). ). By this compression molding, the spiral fiber-shaped ground chips contained in the flocculent aggregate B are sheared. Further, excess water and oil are removed, and the water content of the brittle molded product A is adjusted to 2 to 12% by weight, and the oil content is adjusted to 1 to 5% by weight. Thereby, it is possible to effectively prevent the oxidation of pure iron, which is a component of the grinding chips, with a minimum residual oil content. Also, since the water content of the flocculent agglomerate B is adjusted in advance to a range not exceeding 50% by weight and the oil content not exceeding 10% by weight, the water content and the oil content of the brittle molded product A are reduced. It can be easily and properly adjusted only by compression molding. The brittle molded body A is
It is formed in a shape that is easy to handle, such as a column, a sphere, and a prism, and is hardened to such a degree that it does not collapse during transportation or the like.

Next, the brittle compact A is impregnated with a liquid solidification aid D. The impregnation with the solidification aid D is performed, for example, by immersing the brittle molded body A in the solidification aid D injected into the tank 8 while conveying the brittle molded body A on the belt conveyor 7 (see FIG. 1D). . As the solidification aid D used in this embodiment, it is preferable to use at least one selected from colloidal silica, sodium silicate, aluminum phosphate, and asphalt emulsion,
Thereby, the brittle molded body A can be easily and firmly solidified. Further, it is preferable to impregnate these solidification aids with 2 to 30% by weight, so that the brittle molding A solidified more firmly can be obtained.

Since the brittle compact A obtained as described above always retains a part of the oil of the grinding fluid even during machining, the oxidation of pure iron, which is a component of grinding chips, is effectively prevented. Have been. Therefore, it can be suitably reused particularly as a briquette material for a steelmaking raw material. For example, FIG.
As shown in FIG. 2, the brittle compact A impregnated with the solidification aid D is cured (dried) (see FIG. 2 (a)) to remove the water content (see FIG. 2 (b)). Thus, a briquette G for a steelmaking raw material can be obtained (see FIG. 2 (c)).
It is preferable to carry out this curing for about two days because the water content can be surely removed. In the curing, spray drying with air may be performed in addition to drying at room temperature.

The briquette G obtained as described above is obtained by drying the brittle molded body A, so that there is no danger of bumping or soaring even if it is put into a blast furnace as it is. Further, since the machining is performed while a part of the oil of the grinding fluid is always held, the oxidation of the pure iron is effectively prevented. For example, it has been confirmed that a briquette G manufactured using flocculent aggregate B containing ground cuttings of bearing steel (SUJ-2) contains 70% by weight or more of pure iron. Therefore, the melting yield is as high as 90% or more, and it can be provided as a high quality steelmaking raw material to a steelmaker for a fee. Moreover, it is easy to carry and other handling in solid form. In addition, the method for producing the briquette G can solidify the flocculent aggregate B without requiring a step of pulverizing and refining the flocculent aggregate B, so that the briquette G can be efficiently produced. Can be.

The brittle compact A may not be impregnated with the solidification aid D. In this case, a briquette G for a steelmaking raw material can be produced, for example, by the following method. That is, first, the brittle molded product A obtained by compression molding shown in FIG.
Together with a chopper-equipped mixer (or Henschel-type mixer) 5 having a rotary blade 4 for pulverization (FIG. 3).
(a)). In this way, the ground cuttings of the brittle compact A are further finely sheared (finish shearing) to obtain a powder E containing an iron-based powder made of pure iron, an oil component, and a solidification aid D (FIG. 3 ( b)). The major axis of the iron-based powder is 3
About 1000 μm. At the time of pulverizing the brittle molded body A, since the fibrous ground cuttings in the brittle molded body A have been sheared in advance, they can be finish-sheared without any trouble. If the fibrous ground chips in the brittle molded body A are not sheared, they are mixed with a mixer with a chopper (or Henschel mixer) 5
It takes a long time to pulverize, and it is not economically advantageous, and it is also difficult to obtain a fine iron-based powder. In addition, as a solidification auxiliary used in this case,
Waste molasses such as rice bran and sugarcane, starches such as potato starch and corn starch, quicklime, colloidal silica, sodium silicate,
One or more selected from aluminum phosphate, vinyl acetate sludge, asphalt emulsion, and bentonite are preferably used. Particularly, the rice bran and molasses are very suitable as the solidification aid D because the solidification of the powder E is effectively promoted and the price is low. In addition, when the asphalt emulsion is kneaded and then separated into asphalt and water, caking is generated and the strength is developed. As the asphalt emulsion, an anionic asphalt is preferably used.

Next, a predetermined amount of the powder E is compression-molded by using, for example, a roll-type molding machine or a cylinder-type molding machine 6 (see FIG. 3 (c)). A pillow-shaped briquette F is obtained. During the compression molding of the powder E, the iron-based powder to which the fat or oil has adhered can be firmly bound and solidified by the solidification aid D and the water in the powder E. In particular, as powder E, water 5
Containing 6% by weight, rice bran 4% by weight and molasses 2% by weight,
In addition, when a material containing 7 to 15% by weight of water and 2 to 10% by weight of vinyl acetate sludge is used, briquette F solidified more firmly can be obtained.

Then, the briquette F immediately after compression molding is blown with room temperature or cooled air to rapidly cool it (see FIG. 3 (d)). Thereby, the briquette F can be easily and stably solidified. Thereafter, the briquette F is cured (dried) to remove the water content (see FIG. 3 (e)), thereby obtaining a briquette G for a steelmaking raw material (see FIG. 3 (f)). This curing is 2
It is preferable to carry out the treatment for about a day because the contained water can be surely removed.

The above-described method for producing a brittle compact A is particularly suitably applied to the reuse of ground chips containing 0.2% by weight or more of carbon. Such grinding chips have a large springback and are difficult to solidify. However, by applying the compression molding of the present invention shown in FIG. The powder can be effectively sheared. As a typical example of the ground chips containing 0.2% by weight or more of carbon, ground chips of bearing steel can be given.

The shape of the brittle molded body A is as follows.
In addition to the cylindrical shape and the like, an oval shape, an almond shape, a rugby ball shape, and the like, having a rounded peripheral portion, and a substantially pillow shape in which the thickness gradually increases from the peripheral portion toward the central portion. Good (see FIG. 4). By being formed into such a shape, it is strong against a compressive load and hardly collapses, and partial breakage at corners or the like hardly occurs. Further, the brittle molded body A of the present invention is pulverized into powder, so that, in addition to the briquette G for the steelmaking raw material, a powdered raw material for a sintered metal and an additive material such as a resin for a magnetic material use. Can also be reused.

[0021]

As described above, according to the brittle compact according to the first aspect, since it contains a large amount of pure iron, it can be processed into a powdery form, for example, to produce high quality briquettes for steelmaking raw materials and sintering. It can be reused as metal material, etc.
It is useful for environmental conservation and can reduce the cost of discarding grinding chips. According to the brittle molding according to the second aspect, since it is solidified by the solidification aid, it can have a desired strength. For this reason, it is difficult to disintegrate, and handling such as transportation and storage becomes easy.

According to the brittle molding according to the third aspect, since the solidification aid is at least one selected from colloidal silica, sodium silicate, aluminum phosphate, and asphalt emulsion, it contains oil. It becomes a solid that has been solidified. For this reason, it is harder to collapse,
Handling such as transportation and storage becomes easier. According to the brittle molded product according to the fourth aspect, since the oil content is 1 to 5% by weight, it is solidified to an appropriate hardness, and is a component of the ground swarf with a minimum residual oil content. Oxidation of iron can be effectively prevented.

According to the method for manufacturing a brittle molded product according to the fifth aspect, the compression molding of the flocculent agglomerates can easily shear the fibrous ground chips which have been difficult to shear in the past. Further, since the compression molding is performed while retaining the oil content contained in the grinding fluid, it is possible to prevent the pure iron, which is a component of the grinding chips, from being oxidized. For this reason, a brittle compact containing a large amount of pure iron can be easily and reliably obtained.

According to the method for manufacturing a brittle molded product according to the sixth aspect, a brittle molded product solidified to a desired strength can be obtained by the solidification aid impregnated in the brittle molded product. Therefore, it is possible to obtain a brittle molded body that is hardly disintegrated and easy to handle such as transportation and storage. According to the method for producing a brittle molded article according to claim 7, since at least one selected from colloidal silica, sodium silicate, and aluminum phosphate asphalt emulsion is used as the solidification aid, the solidification aid contains oil. A strongly solidified brittle molded body can be obtained. Therefore, it is possible to obtain a brittle molded body that is less likely to collapse and that is easier to handle such as transport and storage.

According to the method for producing a brittle molded product according to the eighth aspect, since the solidification aid is mixed in an amount of 2 to 30% by weight, a brittle molded product which is more solidified can be obtained. For this reason, it is possible to obtain a brittle molded body that is more difficult to collapse and that is extremely easy to handle such as transportation and storage. According to the method for producing a brittle molded product according to the ninth aspect, the flocculent aggregate is used in which the water content is adjusted to a range not exceeding 50% by weight and the oil content is adjusted to a range not exceeding 10% by weight. Therefore, handling such as transportation of the flocculent aggregate is facilitated, and excess moisture and oil content of the brittle molded body can be easily and appropriately removed only by compression molding.

According to the method for manufacturing a brittle molded product according to the tenth aspect, the water content of the brittle molded product is adjusted to 2 to 12% by weight and the oil content is adjusted to 1 to 5% by weight. , And the oxidation of pure iron, which is a component of the ground swarf, can be effectively prevented by the minimum residual oil content. According to the method for manufacturing a brittle molded product according to the eleventh aspect, even with respect to ground chips containing 0.2% by weight or more of carbon having a large springback, the influence of the springback is eliminated and the compression molding is effectively performed. Can be sheared.

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for producing a brittle molded body according to one embodiment of the present invention.

FIG. 2 is a process chart showing a method for producing briquettes from brittle molded bodies.

FIG. 3 is a process chart showing another method for producing briquettes from brittle moldings.

FIG. 4 is a partially cutaway perspective view showing another shape of the brittle molded body.

[Explanation of symbols]

 A Brittle molded body B Cotton-like aggregate C Brittle molded body D Solidification aid E Powder G Briquette

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuma Matsuda 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Co., Ltd. (72) Yoshihiro Kiyoo 3-58 Minamisenba, Chuo-ku, Osaka-shi Koyo Inside Seiko Co., Ltd. (72) Shoichi Kashino 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Co., Ltd. F term (reference) 4K018 AA24 BA14 BB08 CA07 CA11

Claims (11)

[Claims] 1. A brittle molded product obtained by compression-molding a flocculent aggregate containing iron-based metal ground chips and a grinding fluid containing oil and water into a predetermined shape. 2. The brittle molded article according to claim 1, which is solidified with a solidification aid. 3. The method according to claim 1, wherein the solidification aid is colloidal silica,
The brittle molded product according to claim 1, wherein the brittle molded product is at least one selected from sodium silicate, aluminum phosphate, and asphalt emulsion. 4. The brittle molded article according to claim 1, wherein said brittle molded article has an oil content of 1 to 5% by weight. 5. A flocculent agglomerate containing a grinding chip of an iron-based metal and a grinding fluid containing oil and water is compression-molded, whereby the fibrous grinding chips are sheared and excess water and oil are removed. A method for producing a brittle molded product, wherein a brittle molded product having a predetermined shape removed is obtained. 6. The method for producing a brittle molded article according to claim 5, further comprising a step of impregnating the brittle molded article with a solidification aid. 7. The method according to claim 6, wherein at least one selected from the group consisting of colloidal silica, sodium silicate, aluminum phosphate, and asphalt emulsion is used as the solidification aid. 8. The method for producing a brittle molded product according to claim 7, wherein the solidification aid is impregnated with 2 to 30% by weight. 9. The brittle molded article according to claim 5, wherein the flocculent aggregate is adjusted to a water content not exceeding 50% by weight and an oil content not exceeding 10% by weight. Production method. 10. The method for producing a brittle molded article according to claim 5, wherein the moisture content of the brittle molded article is adjusted to 2 to 12% by weight and the oil content is adjusted to 1 to 5% by weight. 11. The method for producing a brittle molded product according to claim 5, wherein a material containing 0.2% by weight or more of carbon is used as said ground swarf.