JP5986284B1 - Method for producing molding composition and method for producing briquette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a molding composition, wherein a cotton-like aggregate which is difficult to be molded by compression molding as it is is formed into a molding composition which can be molded by compression molding. A method for producing a molding composition containing ferrous metal grinding chips, the flocculent aggregate comprising the ferrous metal grinding chips and a cutting fluid containing oil and moisture. And a quick lime having an average particle size of 1 mm or less is mixed. [Selection] Figure 1

Description

  The present invention relates to a method for producing a molding composition using grinding chips generated during grinding of an iron-based metal, and a method for producing briquettes using the molding composition.

Chips generated when grinding ferrous metals such as bearing steel and carburized steel (hereinafter used as concepts including polishing, super-finish polishing, lapping, etc.) are grinding fluids and abrasives containing moisture and oil. It is recovered as a cotton-like (fibrous) agglomerate containing. Since this flocculent aggregate contains a large amount of pure iron, attempts have been made to reuse it as a raw material for steelmaking. However, since the flocculent aggregate contains a large amount of water, if the flocculent aggregate is put into a blast furnace as it is, it causes a problem that bumping (steam explosion) occurs due to the water.
Therefore, conventionally, the above flocculent aggregates are often landfilled outsourced to a waste disposal company without being reused.

On the other hand, for example, Patent Document 1 discloses a dry briquette containing powdery pure iron and an oil component, and includes a ferrous metal grinding chip and a cotton containing a grinding fluid containing oil and moisture. The brittle molded body, which is obtained by removing excess water and oil content obtained by compression molding of the aggregates and retaining 1 to 5% by weight of pure iron oxidation-preventing oil, is impregnated with an inorganic solidification aid. Briquettes for steelmaking raw materials are described.
According to the technique described in Patent Document 1, since the flocculent aggregate can be reused as a high-quality steelmaking raw material, it is useful for environmental conservation and can reduce the disposal cost of the grinding chips.

  By the way, compression molding of the said cotton-like aggregate is performed using the compression molding machine shown by FIG. 3, for example. FIG. 3 is an explanatory view of a compression molding machine that can be used for compression molding of cotton-like aggregates. The compression molding machine 21 includes a cylindrical compression section 22 and the compression section on one end side of the compression section 22. A gate portion 23 disposed so as to open and close an opening on one end side of 22, and a pusher shaft 24 a disposed on the other end side of the compression portion 22, and slides in a chamber 22 a of the compression portion 22. And a hydraulic cylinder 24 configured to obtain. The flocculent aggregate 25 supplied into the chamber 22a of the compression section 22 through an opening (not shown) formed in the peripheral wall of the compression section 22 is compressed by driving the pusher shaft 24a forward. Can be molded. At this time, excess water and oil contained in the cotton-like aggregates are formed in the liquid discharge passage 26 formed in the gate portion 23 (this liquid discharge passage is formed in the peripheral wall of the compression portion 22 near the gate portion 23. Are also discharged outside. Thereby, an excess water | moisture content and oil content are removed and the brittle molded object containing the oil content and water | moisture content of a predetermined ratio is obtained.

  However, in the cotton-like aggregate, an oil-based cutting fluid or a cutting fluid containing a large amount of oil is used as the cutting fluid, so that it has a high oil content and has a solid texture (including mud). However, it has been difficult to compress and mold the flocculent aggregates having such properties with the compression molding machine as described above. That is, in the cotton-like aggregate having the above-described properties, the oil component of the grinding fluid and the grinding chips are very strong, and only the grinding fluid cannot be squeezed out during compression. Aggregates themselves were ejected and could not be compression molded. For this reason, the above-described cotton-like aggregate having a high oil content has to be recycled by entrusting it to a specialized supplier.

  On the other hand, in patent document 2, as an iron-type powder material containing the iron-type metal grinding chips which can be compression-molded, it is a mud which consists of iron-type metal grinding chips and oil containing oil and moisture. The iron-type powder material formed by stirring and mixing a body, quicklime, and water is proposed.

JP 2002-121625 A (Patent No. 3711045) JP 2008-163412 A

  According to the technique disclosed in Patent Document 2, even if it is a cotton-like aggregate (mud) that is formed of iron-based metal grinding chips and grinding oil containing oil and moisture, it is compression molded. The briquette for steelmaking raw materials can be manufactured. However, the briquette for steelmaking raw material manufactured by the technique disclosed in Patent Document 2 may not be able to ensure sufficient strength even after undergoing a treatment of impregnating a brittle molded body with a solidification aid. .

  The present inventors have intensively studied to solve such problems, and the cause of insufficient strength of briquettes produced by the technique disclosed in Patent Document 2 is that after producing a molded article, It was found that unreacted quicklime remaining in the body reacted with water and was in a volume expansion produced during this reaction. Furthermore, it discovered that said subject could be solved by using quick lime of a predetermined particle diameter as quick lime, and completed this invention.

  (1) A method for producing a molding composition of the present invention is a method for producing a molding composition containing ferrous metal grinding chips, wherein the ferrous metal grinding chips, oil and moisture are contained. Quick lime having an average particle diameter of 1 mm or less is mixed with a flocculent aggregate containing a cutting fluid to be contained.

According to the above method for producing a molding composition, when quick lime having a specific average particle diameter is mixed with a flocculent aggregate containing iron-based metal grinding chips and grinding oil containing oil and moisture, Quick lime and water react to produce calcium hydroxide (slaked lime) and generate a large amount of heat. Due to this heat, the temperature of the mixture rises and much of the water contained in the flocculent aggregates evaporates, and much of the oil is surrounded by the generated slaked lime. Therefore, even if the flocculent flocculent has a high oil content and is a solid flocculent flocculent flocculent, the flocculent flocculent has a low viscosity as the reaction between the quicklime and water progresses. It becomes a powdery composition having a tactile sensation and becomes a molding composition that can be compression-molded by a conventional compression molding machine.
Therefore, a compact containing the iron-based metal grinding chips can be produced by compression molding the molding composition.

Moreover, when the said flocculent aggregate and the said quicklime are mixed in the manufacturing method of the said composition for shaping | molding, as above-mentioned, water and quicklime react and produce | generate slaked lime. At this time, the volume of the reactant expands about twice. Therefore, when a molding composition is produced by mixing flocculent aggregates and quicklime, if unreacted quicklime remains in the molding composition, molding produced using this molding composition. In the body, the unreacted quicklime reacts with moisture in the atmosphere and the above-described volume expansion occurs, and as a result, the strength of the molded body may decrease.
On the other hand, in the manufacturing method of the molding composition of this invention, the quick lime whose average particle diameter is 1 mm or less is used as quick lime. Therefore, when the flocculent aggregate and the quicklime are mixed, the reaction between the quicklime and water contained in the flocculent surely proceeds, and unreacted quicklime is produced in the produced molding composition. Can be prevented from remaining. Therefore, when a molded body is produced using the molding composition, the molded body does not contain unreacted quicklime, and the molded body is caused by the presence of unreacted quicklime remaining in the molded body. It is possible to avoid a decrease in strength.

(2) In the manufacturing method of the said composition for molding, it is preferable that the said quicklime is quicklime screened with the sieve of 1 mm of openings.
That is, the quicklime is preferably quicklime having a size that passes through a sieve having an opening of 1 mm.
In this case, it is possible to more reliably avoid the presence of quick lime having a particle diameter of more than 1 mm. Therefore, it is possible to more reliably avoid unreacted quicklime remaining in the produced molding composition, and the molding composition is a molding composition for producing a molded article having excellent strength. As more suitable.

(3) In the manufacturing method of the said molding composition, it is preferable to mix water in addition to the said quicklime to the said cotton-like aggregate.
In this case, it is possible to more reliably avoid the reaction between quick lime and water and the unreacted quick lime remaining in the molding composition. Therefore, the said molding composition is suitable as a molding composition for manufacturing the molded object which has the outstanding intensity | strength.
Such mixing of water is particularly useful when a flocculent aggregate containing cutting oil having a high oil content and a relatively low water content is used as the flocculent aggregate of the starting material.

(4) The briquette production method of the present invention is a method for producing a briquette by compression molding the molding composition produced by any one of the production methods (1) to (3) above.
(A) After mixing the solidification aid into the molding composition, the resulting mixture is compression molded to produce a briquette precursor A, and then the briquette precursor A is dried, or
(B) After forming the briquette precursor B by compression molding the molding composition, the briquette precursor B is impregnated with a solidification aid, and then the briquette precursor B is dried.
It is characterized by undergoing a process.

In the manufacturing method of the briquette, since the molding composition manufactured by any one of the manufacturing methods (1) to (3) is used as the molding composition, the cotton material having a tactile feel with a solid material as a starting material. Even if it is an aggregate, a briquette can be manufactured by compression molding.
Furthermore, in the manufacturing method of the briquette, after the solidification aid was mixed with the molding composition, the obtained mixture was compression molded, or the molding composition was obtained after compression molding. Since the molded body is impregnated with the solidification aid, the briquette is reinforced by the solidification aid, and as a result, a briquette with excellent strength can be produced.
The obtained briquette can be suitably used as a steelmaking raw material.

(5) In the briquette production method, the solidification aid is preferably at least one selected from colloidal silica, sodium silicate, aluminum phosphate and asphalt emulsion.
These solidification aids are suitable for imparting strength to briquettes, and by using these solidification aids, higher strength briquettes can be produced.

(6) In the briquette manufacturing method, the molding composition preferably includes a cement component, and the solidification aid is sodium silicate.
In this case, since the cement component functions as a hardening agent for the solidification aid (sodium silicate), the strength of the manufactured briquette can be further improved.

According to the method for producing a molding composition of the present invention, it is possible to obtain a molding composition that can be molded by compression molding even if it is a cotton-like aggregate that is difficult to be molded by compression molding as it is.
According to the briquette manufacturing method of the present invention, a briquette having excellent strength can be manufactured through compression molding.

It is process drawing which shows the process order of 1st Embodiment. It is process drawing which shows the process order of 2nd Embodiment. It is explanatory drawing of the compression molding machine which can be used for the compression molding of a cotton-like aggregate. 2 is a color photograph of a briquette produced in Example 1 after a second drop test. 4 is a color photograph after the second drop test of the briquette produced in Example 2. FIG. 2 is a color photograph after a second drop test of a briquette produced in Comparative Example 1. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the following embodiment, the starting material is a flocculent aggregate containing iron-based metal grinding chips and a cutting fluid containing oil and moisture.

The flocculent aggregate is obtained by collecting grinding chips generated when grinding an iron-based metal such as bearing steel or carburized steel together with a grinding liquid or abrasive grains containing moisture and oil. The cotton-like agglomerates have different properties depending on the composition. As the oil content increases, the viscosity increases, the sticky feel increases, and the gel-like aggregates appear. And as for the said cotton-like aggregate, it becomes difficult to produce a molded object as it is by compression molding as oil content rate becomes high. Specifically, when the oil content exceeds 5% by weight, it becomes difficult to produce a molded product as it is by compression molding. When the oil content exceeds 12% by weight, the molded product is directly processed by compression molding. It is almost impossible to make it.
The oil content of the flocculent aggregate is likely to depend on the composition of the cutting fluid contained in the flocculent aggregate, and the flocculent aggregate containing the oil-based cutting fluid has a high oil content and can be directly compression molded. Prone to become difficult. On the other hand, the flocculent aggregate containing a water-based cutting fluid as the cutting fluid tends to have a low oil content (approximately 1 to 5% by weight), and such flocculent aggregate has poor solid texture. Usually, a molded body can be produced by compression molding as it is.
According to the embodiment of the present invention, the flocculent agglomerates can be carried out regardless of whether the oil content is high or low. Since compression molding is possible, the embodiment of the present invention is particularly suitable for producing a molded body by compression molding using a cotton-like aggregate having a high oil content as a starting material.

(First embodiment)
Here, a molding composition that includes iron-based metal grinding chips, a cutting fluid containing oil and water, and has a solid texture and a gel-like cotton-like aggregate L as a starting material. An article is manufactured (manufacturing method of molding composition), and then a briquette is manufactured using the obtained molding composition (manufacturing method of briquette), and a series of steps will be described in the order of steps.

(1) The modifier M containing quicklime is added to the flocculent aggregate L, and both are mixed by stirring to obtain a mixture N (see FIG. 1 (a)).
In this treatment, the digestive water absorption reaction of quicklime (the hydration reaction of quicklime itself: see the following formula (1)) in which quicklime reacts with the moisture contained in the cutting fluid in the cotton-like aggregate L proceeds to produce slaked lime. To do.
CaO + H ₂ O → Ca (OH) ₂ + Heat In this reaction, moisture is evaporated due to heat generated during the reaction, and the oil contained in the grinding fluid is surrounded by the generated slaked lime. Therefore, the cotton-like aggregate L that exhibits a gel-like texture with a sticky feel comes to have a smooth feel.
In the digestion and absorption reaction, volume expansion occurs.

The quicklime has an average particle diameter of 1 mm or less.
If the average particle diameter of the quicklime exceeds 1 mm, the reaction between the quicklime and moisture described above does not proceed sufficiently, and when a molding composition is produced, a powder in which unreacted quicklime remains in the center is produced. May end up. Therefore, when a molded body is produced by compression molding the obtained molding composition, unreacted quicklime in the molded body reacts with moisture in the atmosphere and moisture contained in the solidification aid described later, As a result, volume expansion of the molded body occurs, and as a result, the strength of the molded body may be reduced.
On the other hand, when the average particle diameter of the quicklime is 1 mm or less, the digestion and water absorption reaction of the quicklime described above proceeds reliably by mixing with the flocculent aggregate L, and unreacted quicklime may remain. It is possible to avoid the occurrence of the above-described decrease in strength due to volume expansion in a molded body that is suppressed and produced by compression molding the obtained molding composition.
The average particle diameter of the quicklime is preferably less than 1 mm.

  The lower limit of the average particle diameter of the quicklime is not particularly limited, and may be small. However, if it is too small, handling becomes difficult or aggregation tends to occur, and therefore, about 0.1 mm is preferable.

The average particle diameter of the quicklime may be measured by a sieving method.
That is, several sieves with different mesh sizes are stacked in order from the smallest mesh size, then shaken to screen the quick lime, and then the mass of quick lime remaining on each sieve is measured and accumulated in the graph What is necessary is just to obtain | require distribution and calculating | requiring an average particle diameter.
At this time, a sieve conforming to JIS Z 8801 may be used.

The quicklime is more preferably quicklime that has been sieved with a sieve having an opening of 1 mm. This is because by using only quicklime that has passed through a sieve having a mesh opening of 1 mm, mixing of quicklime with a particle size exceeding 1 mm can be reliably avoided.
The quick lime is passed through a sieve having a mesh size of 0.1 mm and a sieve having a mesh size of 1.0 mm, that is, passing through a sieve having a mesh size of 1.0 mm and passing through a sieve having a mesh size of 0.1 mm. More preferred is quicklime.

The amount of the quicklime is 10 to 30 g as a standard with respect to 100 g of the flocculent aggregate L.
When the amount of the quicklime is small, the moldability of the obtained molding composition may be insufficient when the oil content of the cotton-like aggregate is high. On the other hand, as the blending amount of quicklime is increased, the moldability of the obtained molding composition is not improved, and in the briquette manufactured through the steps described later when the blending amount of quicklime is too large, The content of iron-based metal is relatively lowered, and the value as a briquette for steelmaking raw material is lowered.

The said modifier M may consist only of quick lime, and may contain other components other than quick lime.
As said other component, a cement component, aluminum powder, etc. are mentioned, for example.

Examples of the cement component include clinker containing, as main chemical components, calcium oxide (CaO), silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and iron (III) oxide (Fe ₂ O ₃ ), Examples include so-called poride cement containing gypsum.
Since the cement component can function as a curing agent for sodium silicate (water glass), in the subsequent step, when sodium silicate (water glass) is used as a solidification aid, Curing is promoted and briquettes with higher strength can be produced.
When using the said cement component, the usage-amount is about 25g with respect to 100g of quicklime (a 20-30 weight% of quicklime is preferable).

When the modifying agent M contains quick lime and a cement component, the modifying agent M is a commercially available product for the purpose of improving soil quality, such as dry (Yoshizawa Lime Industry Co., Ltd.), green lime. LC-E (manufactured by Ube Materials Co., Ltd.), Youth Tabiller L (manufactured by Ube Industries, Ltd.), Rock Mighty C, Rock Mighty S (manufactured by Chichibu Lime Industry Co., Ltd.) and the like can also be used.
However, in these commercially available products, the particle size of the powder may be large. In this case, the commercially available product is crushed and the average particle size of the powder is set to 1.0 mm or less before use.

When the aluminum powder is added, since the reaction between the aluminum powder and water is an exothermic reaction, the amount of heat generated when the flocculent aggregate L and the modifier M are mixed can be increased. As a result, the cotton-like aggregate L can be made into a tactile mixture that is smoother in a shorter time.
When using the said aluminum powder, the usage-amount is about 15g with respect to 100g of quicklime (12-18 weight% of quicklime is preferable).

(2) Next, water is further mixed into the mixture N obtained by mixing the flocculent aggregate L and the modifier M to prepare a molding composition C (see FIG. 1B). ).
In the above-described quick lime digestion and water absorption reaction, the volume of the reaction product expands about twice. Therefore, when the digestive water absorption reaction of quick lime proceeds after compression molding the molding composition C described later or after obtaining a molded body by compression molding, the molding composition C cannot be molded, The strength of the produced molded body may be reduced, or in some cases, the produced molded body may be collapsed.
On the other hand, by further mixing water with the mixture N, the above-described digestion and water absorption reaction of quicklime can be completed more reliably.
Moreover, when the said modifier M contains aluminum powder, it becomes easy to produce heat | fever by mixing water at this process.
In this step, the completion of the digestive water absorption reaction of quicklime can be confirmed by measuring the temperature after mixing the water and reducing the heat generation (the temperature of the molding composition C has decreased). Moreover, after mixing water, you may cure for a fixed time (for example, 24 hours).

The amount of water added in this step is not particularly limited, and may be appropriately selected in consideration of the amount of water originally contained in the flocculent aggregate L, the amount of modifier M added, and the like.
Specifically, for example, the sum of the amount of water originally contained in the flocculent aggregate L and the amount of water added in this step is 1.3-3. As a guideline, the amount of water added should be about 0 times (by weight).
If the cotton-like aggregate L originally contains a sufficient amount of water, this step is not necessarily performed.
By passing through the process (1) and the process (2) performed as needed, the molding composition C having a smooth touch can be produced.

(3) After mixing the solidification aid D with the molding composition C prepared through the above (1) and (2) (see FIG. 1 (c)), the resulting mixture is put into the molding die 3. For example, the briquette precursor A is produced by compression molding with a hydraulic press (see FIGS. 1D and 1E).

Here, examples of the solidification aid D include colloidal silica, sodium silicate (water glass), aluminum phosphate, and asphalt emulsion. These may be used alone or in combination of two or more.
Of these, sodium silicate (water glass) is preferable.
In particular, when the modifier M containing a cement component is used as the modifier M, it is preferable to use sodium silicate (water glass) as a solidification aid. This is because it is particularly suitable for improving the strength of the briquette to be manufactured.
The solidification aid D is preferably prepared in a liquid state.

  The addition amount of the solidification aid D in this step is not particularly limited and may be appropriately selected in consideration of the composition of the molding composition C. For example, about 7 to 15 g with respect to 100 g of the molding composition C. The standard is (weight basis).

  The shape of the briquette precursor A is not specifically limited, For example, what is necessary is just to shape | mold into a column shape (refer FIG.1 (e)). In addition to the cylindrical shape, for example, it may be formed into other shapes such as a spherical shape, a prismatic shape, or a pillow shape.

(4) Finally, the briquette precursor A is dried to complete the steelmaking raw material briquette X (see FIGS. 1F and 1G).
At this time, the drying of the briquette precursor A may be natural drying or heat drying.
In this step, the briquette precursor A is dried, whereby the solidification auxiliary D is cured (solidified), and the briquette X is given high strength.

In this embodiment, since the modifier M containing quicklime is mixed with the cotton-like aggregate L and then compression-molded, the cotton-like aggregate L contains an oil-based cutting fluid or a cutting fluid containing a large amount of oil as a grinding fluid. Even in this case, it can be formed into a desired shape.
In addition, as quick lime contained in the modifier M, the use of quick lime with an average particle size of 1 mm or less and a small particle size, it is possible to suppress the unreacted quick lime from remaining in the molding composition, As a result, it can be avoided that the briquette precursor produced by compression molding the molding composition is expanded and its strength is lowered. Therefore, according to the present embodiment, a briquette having excellent strength can be manufactured.

  Also, the briquette manufacturing method according to the present embodiment is different from the briquette manufacturing method of the second embodiment to be described later in advance in the molding material without producing a brittle molded body once using the molding composition. Since the solidification auxiliary D is mixed and the formed briquette precursor A is dried as it is, the number of steps can be reduced as compared with the second embodiment.

(Second Embodiment)
In the first embodiment, in the step (3), after mixing the solidification aid D with the molding composition C, the resulting mixture was compression molded to produce the briquette precursor A. In an embodiment, the order of use of the solidification aid and compression molding is reversed.
That is, after forming the briquette precursor B by compression molding the molding composition C, the briquette precursor B is impregnated with the liquid solidification auxiliary D, and then the briquette precursor B is dried to form the briquette Y. (See FIG. 2).

Hereinafter, the manufacturing method according to the present embodiment will be described in the order of steps.
(1) Similar to the steps (1) and (2) of the first embodiment, the mixture N obtained by mixing the flocculent L and the modifier M is further mixed with water to form a molding composition. A product C is prepared (see FIGS. 2A and 2B). Here, as the modifier M, as in the first embodiment, quick lime having an average particle diameter of 1.0 mm or less is an essential component, and further, a component containing a cement component or aluminum powder as an optional component is used.

(2) Next, the molding composition C is put into the molding die 3 and compression-molded by, for example, a hydraulic press to produce the briquette precursor B (see FIGS. 2C and 2D).
The shape of the briquette precursor B is not specifically limited, For example, what is necessary is just to shape | mold into a column shape (refer FIG.2 (c)). In addition to the cylindrical shape, for example, it may be formed into other shapes such as a spherical shape, a prismatic shape, or a pillow shape.
In this case, since the molding composition does not contain a solidification aid, the briquette precursor B is produced as a porous brittle molded body.

(3) The briquette precursor B is impregnated with a liquid solidification auxiliary D (see FIG. 2 (e)).
The impregnation with the solidification auxiliary D is performed, for example, by immersing the briquette precursor B in the solidification auxiliary D injected into the tank 8 while being conveyed by the conveyor belt 7.
Here, since the briquette precursor B is a porous body, the solidification auxiliary D is impregnated inside the briquette precursor B.
If the solidification adjuvant D is prepared in the liquid state, the same thing as the solidification adjuvant used in 1st Embodiment can be used.

(4) Finally, the briquette precursor B impregnated with the solidification auxiliary D is dried to complete the briquette Y (see FIGS. 2F and 2G).
Here, the drying of the briquette precursor B may be natural drying or heat drying.
In this step, the briquette precursor B is dried, whereby the solidification auxiliary D is cured (solidified), and high strength is imparted to the briquette Y.

In this embodiment, since the modifier M containing quicklime is mixed with the cotton-like aggregate L and then compression-molded, the cotton-like aggregate L uses an oil-based cutting fluid or a cutting fluid containing a large amount of oil as the grinding fluid. Even in this case, it can be formed into a desired shape.
In addition, as quick lime contained in the modifier M, since quick lime having an average particle size of 1 mm or less is used, unreacted quick lime can be prevented from remaining in the molding composition, and as a result, It can be avoided that the briquette precursor produced by compression molding the molding composition is expanded and its strength is lowered. Therefore, according to the present embodiment, a briquette having excellent strength can be manufactured.

(Third embodiment)
In the first and second embodiments already described, after mixing the flocculent aggregate L and the modifier M containing quicklime, water is further mixed as necessary, but the molding composition C When water is mixed in the production, the molding composition C may be produced by simultaneously adding the modifier M and water to the flocculent aggregate L and then stirring and mixing them.
Also in this case, the same effects as those of the first and second embodiments can be enjoyed, and a smooth tactile molding composition can be produced.

(Other embodiments)
In an embodiment of the present invention, a flocculent aggregate obtained by collecting grinding chips generated when grinding ferrous metals such as bearing steel and carburized steel together with grinding fluid and abrasive grains containing moisture and oil. On the other hand, before mixing with the modifier, the flocculent aggregate may be subjected to a deoiling treatment to recover a part of the cutting fluid.
As a result, the expensive oil-based grinding fluid contained in the flocculent aggregate can be reused, which is environmentally friendly and leads to cost reduction.

The deoiling treatment may be performed, for example, by sandwiching the cotton-like aggregate with an adsorbing sheet having oil adsorbability and compressing it.
In an embodiment of the present invention, the flocculent aggregate (particularly flocculent flocculent having a high oil content) is prepared by the deoiling treatment or the like before mixing the oil content and water content with the modifier. For example, it is preferable to prepare an oil content of 7 to 30% by weight and a water content of 10 to 40% by weight.
Thereby, in the manufacturing method of the briquette which concerns on embodiment of this invention, it becomes a starting material more suitable for manufacturing a briquette.

  The deoiling treatment is performed by, for example, a method in which the cotton-like aggregate L is sandwiched between a pair of rolls while being conveyed by a belt conveyor, a method that is performed by simple air blowing or air compression, or a method that uses a magnetic separator. You may go.

  As described above, the embodiment described above is suitable for producing a molding composition and a briquette using a cotton-like aggregate having a high oil content as it is difficult to produce a molded body by compression molding as it is. It is a technique. On the other hand, in the briquette manufacturing method according to the embodiment of the present invention, the oil content is low (about 1 to 5% by weight), and the flocculent aggregate (hereinafter referred to as low oil content) capable of producing a molded body by compression molding. (Also referred to as flocculent aggregate) may be used as a raw material for molding in combination with flocculent aggregate having a high oil content and difficult to produce a molded body by compression molding as it is.

Specifically, a cotton-like agglomerate L having a high oil content and difficult to produce a molded body by compression molding as it is through the steps of producing the molding composition in the first to third embodiments described above. After preparing a molding composition C that can be molded by compression molding as a starting material, the molding composition C and the low oil content flocculent aggregate are mixed at an arbitrary ratio, and the resulting mixture is obtained. As a molding composition, briquettes may be produced by performing the steps (3) and (4) of the first embodiment, the steps (2) to (4) of the second embodiment, and the like.
In this case, the ratio of the iron-based metal in the obtained briquette becomes high, and the value as a briquette for steelmaking raw material becomes high.

(Briquette)
The briquette containing the ferrous metal manufactured in the embodiment of the present invention has high strength and is easy to transport and handle. Therefore, it is suitable as a steelmaking raw material briquette.
Moreover, since the said briquette always hold | maintains a part of oil component of a grinding fluid including in process, the oxidation of the pure iron which is a component of a grinding chip is prevented effectively. Moreover, since the briquette is manufactured in a state where a part of the oil of the grinding fluid is always held, oxidation of pure iron is effectively prevented.
Therefore, the briquette can be provided as a high-quality steelmaking raw material to a steelmaker for a fee.

  Hereinafter, the embodiments of the present invention will be described more specifically by way of examples. However, the present invention is not limited to the following examples.

Example 1
(1) To 50 g of the flocculent aggregate discharged in the following step, 12 g of quicklime prepared by the method described below and 10 cc of water were added, sufficiently stirred and mixed, and then allowed to stand at room temperature for 24 hours.
After standing for 24 hours, the mixture was smooth and changed to a tactile mixture.
[Preparation of quicklime]
For quicklime that has been pulverized to an appropriate size, screen with a vibrating sieve equipped with a sieve with an opening of 1.0 mm (10 mesh) and a sieve with an opening of 0.1 mm (149 mesh), Quick lime having a particle size of 0.1 to 1.0 mm was prepared.

  The flocculent agglomerates used in this example are those discharged in the grinding process of the bearing, and are flocculent flocculent textures that are sticky and contain iron-based metal cutting chips and cutting fluid. is there. The cotton-like aggregate (50 g) contains iron (22 g), oil (15 g), moisture (10 g) and others (3 g).

(2) Next, a solution obtained by diluting 5 cc of water glass (sodium silicate No. 3: conforming to JIS K 1408) with 10 cc of water (total amount of 15 cc) was added to the mixture after being left for 24 hours, and mixed well. .
Thereafter, the obtained mixture is put into a pipe having an inner diameter of 4.2 cm, and compression-molded under a condition of 7.3 kg / 1 cm ² using a cylindrical compression member (cylindrical roller) having an outer diameter of 4.0 cm. A cylindrical briquette having a bottom diameter of about 4.2 cm and a height of about 2.4 cm was produced.

(Example 2)
In the step (1) of Example 1, instead of quick lime 12 g, as a modifier containing quick lime and a cement component, dry (Yoshizawa Lime Industry Co., Ltd., quick lime is approximately 80% by weight, and cement component is approximately 20%. A briquette was prepared in the same manner as in Example 1 except that 15 g (containing% by weight) was used. The obtained briquette is a cylindrical briquette having a bottom diameter of about 4.2 cm and a height of about 2.4 cm.
In this example, the modifier (dry) has a sieve with an opening of 1.0 mm (10 mesh) and an opening of 0.1 mm (149 mesh) with respect to the dried dry powder. Screening was performed with a vibrating sieve equipped with a sieve, and the particle size was adjusted to 0.1 to 1.0 mm before use.

(Comparative Example 1)
In the step (1) of Example 1, a briquette was produced in the same manner as in Example 1 except that quick lime prepared by the following method was used as quick lime. The obtained briquette is a cylindrical briquette having a bottom diameter of about 4.2 cm and a height of about 2.4 cm.
[Preparation of quicklime]
The quicklime that has been pulverized to an appropriate size is screened with a vibrating sieve equipped with a sieve with an opening of 3.35 mm (5.5 mesh) and a sieve with an opening of 1.0 mm (10 mesh). And quick lime having a particle size of 1.0 to 3.35 mm was prepared.

The briquettes produced in Examples 1 and 2 and Comparative Example 1 were naturally dropped onto a tile floor from a height of 2 m, and the shape after dropping was visually observed. In addition, each briquette was dropped twice (however, the evaluation was completed when it was greatly damaged by the first drop).
The results are as follows. The shape after dropping is shown in FIGS.

Example 1: In observation after passing through two drop tests, a small breakage was observed in a part of the corner (see FIG. 4).
Example 2: In the observation after two drop tests, a slight chipping was observed at the corner, but there was almost no damaged portion (see FIG. 5).
Comparative Example 1: In the second drop test, it was completely broken (see FIG. 6). In Comparative Example 1, unreacted quicklime (white powder) was observed in the damaged material.

  As is apparent from the results of Examples and Comparative Examples, according to the method for producing a molding composition according to an embodiment of the present invention, a cotton-like aggregate that has a high oil content and is difficult to be molded by compression molding as it is. It can be set as the molding composition which can be shape | molded by compression molding, According to the manufacturing method of the briquette which concerns on embodiment of this invention, a briquette provided with high intensity | strength can be manufactured.

DESCRIPTION OF SYMBOLS 3 Mold | die 7 Conveyor belt 8 Tank 21 Compression molding machine 22 Compression part 23 Gate part 24 Hydraulic cylinder A Briquette precursor B Briquette precursor C Molding composition D Solidification adjuvant L Cotton-like aggregate M Modifier N Mixture X Briquette Y Briquette

Claims (7)

A method for producing a molding composition containing iron-based metal grinding chips,
And grinding chips of the ferrous metal, saw including a cutting fluid containing oil and water, the oil content within the cotton-like aggregates 7 to 30 wt%, average particle diameter of mixing the following quicklime 1mm A process for producing a molding composition characterized by the above.   The method for producing a molding composition according to claim 1, wherein the quicklime is quicklime screened by a sieve having an opening of 1 mm. The method for producing a molding composition according to claim 1, wherein water is further mixed with the flocculent aggregate in addition to the quicklime. After mixing the quicklime with the flocculent aggregate having an oil content of 7 to 30% by weight,
Furthermore, the iron-type metal grinding | polishing chip and the cutting fluid containing an oil component and a water | moisture content are mixed, and the cotton-like aggregate whose oil content is 1 to 5 weight% is mixed. A method for producing a molding composition. A method for producing a briquette by compression molding the molding composition produced by the method for producing a molding composition according to any one of claims 1 to 4 ,
(A) After mixing a solidification aid into the molding composition, the resulting mixture is compression molded to produce a briquette precursor A, and then the briquette precursor A is dried, or
(B) After forming the briquette precursor B by compression molding the molding composition, the briquette precursor B is impregnated with a solidification aid, and then the briquette precursor B is dried.
A method for producing briquettes, characterized by passing through a process. The method for producing briquettes according to claim 5 , wherein the solidification aid is at least one selected from colloidal silica, sodium silicate, aluminum phosphate and asphalt emulsion. The briquette manufacturing method according to claim 6 , wherein the molding composition includes a cement component, and the solidification aid is sodium silicate.