JPH08260074A - Metal-containing powder forming composition and its production - Google Patents

Abstract

PURPOSE: To produce a high-grade metal-contg. powder having a necessary strength at a low cost by mixing a metal-contg. powder having specified apparent sp.gr. and metal content, a fibrous reinforcement having a specified water content and a matrix-type binder by specified amts. CONSTITUTION: This metal-contg. powder has >=1.5t/m<3> apparent sp.gr. and contains >=20% metal, and a ferroalloy powder such as ferromanganese powder, silicon-manganese powder and ferrosilicon powder, Ni catalyst powder, crushed powder generated in a steelmaking process, collected dust and slag are used as the metal-contg. powder. The water content of the fibrous reinforcement is controlled to <=18%, and paper making sludge, wood-chip dust, rice straw and waste cotton are used as the reinforcement. Coal pitch and/or petroleum pitch are used as the matrix-type binder. 10 to 40wt.% fibrous reinforcement, based on the weight of the metal-contg. powder, and 2-7wt.% matrix-type binder are added to the powder, heated and mixed. The mixture is compacted at 0.5-2.5t/cm<2> pressure to obtain the granular material having 10-80mm grain size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a metal-containing material for reusing powder of a metal-containing material useful in the steel industry, the petroleum industry, etc., from the viewpoint of reducing manufacturing cost and effective use of resources. TECHNICAL FIELD The present invention relates to a powder molding composition and a method for producing the same. More specifically, it is possible to easily and economically mold powders of metal-containing materials that are useful in the steel industry, oil industry, etc. The present invention relates to a metal-containing powder molding composition that can be used as, for example,

[0002]

2. Description of the Related Art In the iron manufacturing industry, powders of ferroalloys containing useful metals are generated in various places, and their recycling is an important issue from the viewpoint of reducing manufacturing cost and effective use of resources. . On the other hand, ferroalloy is generally used as a deoxidizing agent added to remove dissolved oxygen in molten steel to produce high-grade steel and an element additive added to adjust steel constituent elements. However, since these ferroalloys are added at the time of blowing in a converter, generally, unless they are particles having a diameter of 3 mm or more, they are scattered by the gas at the time of blowing and have a very low effective utilization rate. Therefore, the utility value of powders such as ferroalloys generated in the ironmaking process or ferroalloys manufacturing process or powders generated during handling is low, and in the past, a small amount was mixed with granules and added to the production line. However, it was mixed with the raw material and processed, but when it was returned to the manufacturing line, the heating and melting process was performed again, resulting in waste of energy and a rise in manufacturing cost. In addition, steel such as Ni, Co, Mo, V, etc. can be used for industrial waste such as powder and pulverized deteriorated products generated during the regeneration process of metal catalysts used in desulfurization equipment in the petroleum industry. Although it contains elements useful for industry, its range of reuse is limited because it is mainly powder.

Therefore, attempts have been made in the past to effectively use industrial waste such as powders generated from ferroalloys and metal catalysts, but favorable results have not been obtained. The reason is that the metal-containing powder has properties such as a high specific heat (large heat capacity) and a heavy molded product. That is, the matrix-type binder that has been conventionally used for molding and that bonds the voids between the metal-containing material powder particles is coal-based pitch, petroleum-based pitch, etc., which melts and permeates by heating and hardens by cooling. However, since the metal-containing powder that is heated at the same time has a large heat capacity and is difficult to cool, the temperature of the molded product itself does not drop easily, and as a result, the matrix-type binder Since the curing is delayed and the initial strength of the product (immediately after molding) becomes low, the molded product often collapses in the initial handling process. In addition, even if the product is cooled with care in handling, the specific gravity of the product is large, so it may be impacted when it is accumulated in the transit section of the belt conveyor during transfer, in the storage tank, or when dropped during truck loading. Since the metal-containing powder is easily broken, and the metal-containing powder is generally composed of fine-grained powder, there is a problem that when a part of the molded product is broken, the powder becomes brittle and easily powdered.

[0004]

DISCLOSURE OF THE INVENTION The present invention is for iron making, in which a metal-containing material powder, which has been difficult to mold in the past, is manufactured by using a matrix type binder such as coal pitch or petroleum pitch. An object of the present invention is to provide a metal-containing powder molding composition and a method for producing the same.

[0005]

As described in the prior art, when a metal-containing powder is molded with a matrix type binder such as coal pitch or petroleum pitch, the initial strength of the molded product is low and the initial strength is low. However, there is a problem in that the product is likely to collapse during the handling process, is likely to be destroyed by the impact during the transfer thereafter, and further, if a part of the molded product is destroyed, the entire molded product is easily pulverized. As a result of studying these problems, the present inventors have attempted to reduce the heat capacity of the entire molded product containing the metal-containing powder, reduce the specific gravity of the molded product to improve impact resistance, and further bond between the raw materials. We have obtained a policy that it is necessary to strengthen wear resistance and improve wear resistance. As a result of the research conducted by the present inventors based on this policy, even if the metal-containing powder has an apparent specific gravity of 1.5 tons / m ³ or more and a metal content of 20% or more, a predetermined amount of fiber By using a reinforcing material and a matrix-type binder in combination, the initial strength is high, it is difficult to be destroyed by impact during transportation, and the entire molded product is stable even if a part of the molded product is destroyed. It was found that a powder molding composition can be obtained. Therefore, the present invention provides a metal-containing powder having an apparent specific gravity of 1.5 tons / m ³ or more and a metal content of 20% or more, a fiber reinforcing material having a water content of 18% or less 10 to 40% by weight, and Matrix type binder 2-7
Provided is a metal-containing powder molding composition containing wt%.

The present invention further provides a method for producing the above-mentioned metal-containing powder molding composition, which comprises the following steps: (1) An apparent specific gravity of 1.5 tons / m ³ or more and a metal content of 20.
% Or more metal-containing powder, and a step of mixing 10 to 40% by weight of a fibrous reinforcing material having a water content of 18% or less, (2) 2 to 7% by weight of a matrix binder in the mixture of step (1) %
Is added, and the mixture is heated and kneaded, and is then cured by cooling, and (3) the kneaded product is molded by applying a pressure of 0.5 to 2.5 ton / cm, and a granule having a particle size of 10 to 80 mm. Alternatively, it is a step of obtaining a metal-containing powder molding composition of a lump. Less than,
The present invention will be described in detail. The metal-containing powder used in the present invention has an apparent specific gravity of 1.5 tons / m ³ or more and a metal content of 2
It is a powder containing 0% or more of metal. The apparent specific gravity of the powder is 1.5 tons / m ³ or more, preferably 1.5 to 5.5 tons / m
³ and particularly preferably 1.5 to 4.0 ton / m ³ . It should be noted that the reason why the apparent specific gravity is limited to 1.5 ton / m ³ or more in this way is that in the case of less than this, it is possible to mold relatively easily even in the conventional technique without using the fiber reinforcing material. This is because the invention is directed to a material having an apparent specific gravity which is difficult to mold by the conventional technique. It is also possible to mold metal-containing powders whose specific gravity is higher than 5.5 ton / m ³ , but it is necessary to increase the amount of fibrous reinforcing material in order to increase the impact resistance of the molded product. This is not preferable because it causes a decrease in the metal content of the molded product. The metal content of the powder is 2
0% or more is preferable, and the higher the content, the higher the commercial value. Limiting the metal content to 20% or more in this way is also related to the apparent specific gravity, but since a material with a low content is light, it is relatively easy to mold, and in the present invention, molding is difficult with the conventional technology. This is because it targets a certain thing.

Specific examples of the metal-containing powder include ferromanganese powder, silicon manganese powder, ferrosilicon powder, ferrochrome powder, silicochrome powder, ferronickel powder, ferrotitanium powder, ferrotungsten powder, Ferro-molybdenum powder, ferro-vanadium powder, metallic silicon powder, metallic silicon and other ferroalloys produced in converter ferroalloys, industrial wastes such as Ni catalyst powder produced in the petroleum industry, and other pulverized powders produced in the steel industry. If necessary, these may be used alone or in combination of two or more kinds, with dust collecting powder, slag, etc. as the main components. The content of the metal-containing powder in the molding composition of the present invention is the balance excluding the fibrous reinforcing material, the matrix-type binder, and other optional additives, and is generally 54. It is suitable that the content is ˜88 wt%, preferably 60 to 88 wt%, particularly preferably 70 to 88 wt%. The fibrous reinforcing material used in the present invention is
A fibrous substance having a water content of 18% or less, and specific examples thereof include papermaking sludge, wood chip dust,
There is a fibrous industrial waste containing cellulose such as wood bark, sugar cane dregs, straw or old cotton.

The water content of the fibrous reinforcing material is 1
It is suitable to be 8% by weight or less, preferably 5 to 18% by weight, particularly preferably 5 to 10% by weight. In particular, the reason why the water content is 18% by weight or less is that the strength of the molded product is not suitable for practical use when the water content is high as shown in FIG. Also, the lower the water content, the better the quality. However, if the water content is too low, especially if the water content is 5% or less, dust is increased during handling, which is not preferable in the working environment. The content of the fibrous reinforcing material, based on the molding composition of the present invention,
It is suitable to be 10 to 40% by weight, preferably 10 to 30% by weight, particularly preferably 10 to 15% by weight. Thus, the amount of fibrous reinforcement is limited to 10% by weight.
If the amount is less than 40% by weight, the stability of the strength of the molding composition of the present invention becomes low. If the amount is more than 40% by weight, an effective amount of the metal-containing powder as a deoxidizing agent or an element additive is added. Because you can't.

Further, the matrix type binder of the present invention is
It can be used without particular limitation as long as it can be melted by heating to penetrate into powder, and hardened when cooled, and can bind powder particles, but especially coal pitch, petroleum pitch, etc. Is preferred. The content of the matrix-type binder in the present invention is, relative to the molding composition of the present invention,
It is suitable to be 2 to 7% by weight, preferably 2 to 5% by weight, particularly preferably 2 to 4% by weight. In this way, the amount of the matrix binder is limited, if it is less than 2% by weight, the whole surface of the powder particles cannot be covered, the cross-linking state as the binder becomes weak, and the strength of the molded product becomes weak. If it is more than 7% by weight, the binder will be excessive and the powder particle spacing will be increased, resulting in a decrease in strength, which is not preferable.

The particle size of the molding composition of the present invention is 10
mm to 80 mm, preferably 20 to 60 mm, particularly preferably
30 to 50 mm is suitable. Thus the particle size
Limited to less than 10 mm, the production efficiency will decrease and
This is because the unit price of the composition increases, and it is larger than 80 mm.
Molding pressure per unit size is dispersed by molding pressure
It becomes difficult to maintain the strength of the molding composition,
Therefore, if you try to increase the molding pressure, the capacity of the molding machine will increase.
Because it is not economical. Molding of the invention
The composition is manufactured as follows. First, the apparent specific gravity is 1.
5 tons / m ³ With the above, a metal-containing material having a metal content of 20% or more
Powder and fibrous reinforcing material having a water content of 18% or less 10
40% by weight with a powerful mixing device such as a paddle mixer
Use to mix objects with a large difference in specific gravity as evenly as possible,
Add 2 to 7% by weight of matrix binder to the mixture
Then, heat kneading at about the softening point of the binder + 10 ° C,
The kneading using a device such as a double roll type molding machine.
0.5 to 2.5 tons / cm, preferably 1.0 to 2.0 tons / c
m, particularly preferably 1.5 to 2.0 t / cm of pressure
Molded and containing metal particles or granules with a particle size of 10-80 mm
Molded into a powdered molding composition and then cooled to obtain a product.
It

[0011]

INDUSTRIAL APPLICABILITY According to the present invention, a molding composition of metal-containing powder, which has been difficult to produce in the past, is bonded to a fibrous industrial waste such as paper sludge and an inexpensive coal pitch, petroleum pitch or the like. By using the agent, it is possible to provide an inexpensive and high-quality metal-containing powder molding composition having a strength that can be practically used.

[0012]

【Example】

[Reference Example] First, in order to verify whether or not it is possible to mold a metal-containing powder using coal-based pitch that is a conventional matrix-type binder, pitch ( A molding test was performed using a soft pitch and a softening point of 45 degrees C). The molding test conditions are shown in Table 1 and the results are shown in FIG. As is apparent from FIG. 1, it has been found that a soft-pitch binder and ferromomanganese powder alone cannot produce a molded product that can be practically used. Further, slaked lime was added for the purpose of improving the strength of the molded product, and the molding test was conducted again. However, although the strength was improved, the molded product could not be put to practical use. Regarding the criteria, the initial strength (value after 1 hour after molding), which is a practical standard, is 70% or more of the coke drum strength (the ratio of particles of 3 mm or more after 30 rotations) and the crushing strength of 75 kg / piece. The above are the criteria for evaluation. Here, the molding test conditions are the conditions of the test machine, and the shape of the molded product is not particularly limited.

[0013]

[Table 1] Table 1 Molding test conditions ───────────────────────────── Molded product shape Macek type ──────── ────────────────────── Molded product size 46 * 46 * 26mm Molding speed Peripheral speed 0.3 m / s Molding pressure 2 ton / cm Ferromanganese component; Mn 75% Powder Fe 18% Si 3% ──────────────────────────────

Example 1 Next, a molding test was carried out using paper sludge, which is industrial waste, as the fibrous reinforcing material of the present invention. Ferromanganese powder with an apparent specific gravity of 4.8 ton / m ³ or more and a metal content of 75% has a water content of 15
% Of paper sludge was added, and 3% by weight of coal-based pitch was added as a binder, followed by heating and kneading, followed by molding at a pressure of about 2 ton / cm to obtain a molding composition having a particle diameter of 46 mm.
The results are summarized in Table 2 and the change in strength is shown in FIG. As a result, a molded product having a strength exceeding the practical level could be obtained by mixing 10% by weight or more of the paper sludge. Here, the Trommel strength, which is a general strength index of the molded product, is also shown together, and the conventional practical application level (90%) is cleared even when no paper sludge is added. This is because the conditions are too lenient and the detection sensitivity is low for a molded product having a small machine diameter (inner diameter of 500 mm) and requiring high strength such as a metal-based molded product. Therefore, the molding composition having a specific gravity of more than 2.0 was evaluated using a coke strength tester (internal diameter 1500 mm) under severe impact conditions. The criteria for practical use are as shown in Reference Example 1.

[0015]

[Table 2] Table 2 ──────────────────────────────────── Blending ratio (wt%) Mold Quality Test ────────────────────────────────── No. Ferroman Pepper Coke Drum Crush Strength Individual Weight Initial Forming Gan powder Sludge Slaked lime Binder Strength (%) (Kg / unit) (gr / unit) Yield (%) ────────────────────────── ─────────── 1 95 ── 2 3 57 35 163 80 2 87 10 ─ 3 69 171 139 95 3 77 20 ─ 3 82 182 126 100 4 67 30 ─ 3 90 189 112 100 5 57 40 ─ 3 91 175 100 100 ─────────────────────────────────────

[Example 2] Next, it was verified how the water content of the paper sludge affects the molding composition of the present invention. Paper sludge, which is an industrial waste, contains a very high amount of water (for example, about 50%), but if it can be used as it is as a raw material for molding, the steps such as drying can be omitted, and it is an inexpensive raw material. Can be effectively utilized as. However, when it is used as a fibrous reinforcing material in the molding of iron alloy powder, it is considered that the water content of the paper sludge has a limit. Therefore, a molding test was conducted in order to obtain the critical water content.
After adding paper sludge with a different water content to ferromanganese powder with an apparent specific gravity of 4.8 ton / m ³ and a metal content of 75%, and adding 3% by weight of the above coal-based pitch as a binder, It was kneaded by heating and molded. The results are shown in FIG. 3 as the influence of the molding composition on the crush strength. as a result,
Although it depends on the mixing ratio of the paper sludge, it has become clear that it is necessary to adjust the limiting water content of the paper sludge to 18% or less in order to maintain the practically applicable strength level. [Example 3] Similarly, a molding test was conducted on molding of various metal-containing powders to verify the effectiveness of paper sludge as a fibrous reinforcing material. Table 3 shows the quality and blending ratio of the molded metal-containing powder, and the quality of the molding composition, and the measurement results are shown in FIG. 4 in relation to the apparent specific gravity of the molding composition and each strength.

[0017]

[Table 3] Table 3 ──────────────────────────────────── Grade table (%) Mixing ratio (Wt%) No. Metal-containing powder ──────────────────────────── Product name Apparent metal-containing super bond Fe Mn Ni SiO ₂ CaO Specific gravity Powdered sludge agent (ton / m ³ ) ──────────────────────────────────── 1 Ferromangan powder 17.6 75.3 − 3.1 − −4.8 97 − 3 2 Ferromangan powder 87 10 3 3 Blast furnace ash powder 28.4 − − 5.6 3.0 2.5 94 − 64 Blast furnace ash powder 84 10 6 5 Binder slag powder 21.1 − − 12.2 43.5 3.1 94 − 6 6 Converter slag powder 84 10 67 7 Ni catalyst powder A − − 60.9 − − 4.2 94 − 68 Ni catalyst powder A 84 10 69 Ni catalyst powder B − − 23.2 62.5 0.5 3.3 93 − 7 10 Ni catalyst powder B 83 10 7 ──────────────── ──────────────────── Table 3 (continued) ───────────────────────── ──────── Molded product grade No. Metal-containing powder ───────────────────────── Product name Coke drum Crush strength Weight Apparent specific gravity Strength (%) (Kg / piece) (gr / piece) (ton / m ³ ) ──────────────────────────── ────── 1 Ferromangan powder 57 35 163 3.70 2 Feromangan powder 69 171 139 3.16 3 Blast furnace ash powder 70 22 94 2.14 4 Blast furnace ash powder 89 195 80 1.82 5 Converter slag powder 67 40 128 2.91 6 Converter Slag powder 85 175 110 2.49 7 Ni catalyst powder A 63 68 160 3.64 8 Ni catalyst powder A 78 210 136 3.10 9 Ni catalyst powder B 64 44 110 2.50 10 Ni catalyst powder B 94 186 94 2.13 ────────── ─────────────────────────

As a result, the strength of the molding composition was strongly related to the apparent specific gravity. Regarding the relationship between the apparent specific gravity of the molding composition and the strength of the coke drum, the drum strength tends to decrease as the apparent specific gravity increases. The practical strength (70% or more) could not be achieved without the paper sludge. By adding 10% of paper sludge, the average strength could be improved by 20%, and sufficient strength for practical use was obtained. Further, in relation to the crushing strength, it increases as the apparent specific gravity increases. The practical strength (75 kg / piece or more) could not be achieved without the paper sludge. Furthermore, by adding 10% of paper sludge, the strength is remarkably improved.
/ Could be seen, and sufficient strength for practical use was obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the binder addition rate and the strength of a molded product when a molding test is performed to verify the strength of a conventional molded product.

FIG. 2 is a diagram showing the strength of a molded product when the mixing ratio of paper sludge as a raw material fiber reinforcing material is changed.

FIG. 3 is a diagram showing the effect of water content in paper sludge on the strength of a molded product.

FIG. 4 is a diagram showing the molding results of various metal-containing powders in relation to the apparent specific gravity of the molded product.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitomi Tonami 1 625 Hikinocho, Fukuyama City, Hiroshima Prefecture Keihan Fukuyama Employee Apartment No. 301

Claims (9)

[Claims] 1. A metal-containing powder having an apparent specific gravity of 1.5 tons / m ³ or more and a metal content of 20% or more, and a water content of 18%.
A metal-containing powder molding composition comprising 10 to 40% by weight of the following fibrous reinforcing material and 2 to 7% by weight of a matrix type binder. 2. The metal-containing powder is ferromanganese powder,
Alloy iron powder such as silicon manganese powder, ferrosilicon powder,
The metal-containing powder molding composition according to claim 1, which is at least one selected from the group consisting of Ni catalyst powder, other pulverized powder generated in the iron making process, dust collecting powder, and slag. 3. The fibrous reinforcing material is at least one of fibrous industrial waste selected from the group consisting of papermaking sludge, wood chip dust, wood bark, sugar cane dross, straw, rice straw and waste cotton. The metal-containing powder molding composition according to claim 1 or 2, which is a seed. 4. The metal-containing powder molding composition according to claim 1, wherein the matrix-type binder is coal-based pitch and / or petroleum-based pitch. 5. The method for producing the metal-containing powder molding composition according to claim 1, comprising the following steps. (1) Specific gravity is 1.5 tons / m
A step of mixing 10 to 40% by weight of a metal-containing powder having a metal content of ³ or more and a metal content of 20% or more, and a fibrous reinforcing material having a water content of 18% or less, (2) in the mixture of step (1), A step of adding 2 to 6% by weight of a matrix type binder, kneading by heating, and curing by cooling, and (3) molding the kneaded product by applying a pressure of 0.5 to 2.5 tons / cm. And particle size 10
The above-mentioned manufacturing method for obtaining a metal-containing powder molding composition having a particle size or a mass of 80 mm. 6. The metal-containing powder is ferromanganese powder,
Alloy iron powder such as silicon manganese powder, ferrosilicon powder,
6. The production method according to claim 5, which is at least one selected from the group consisting of Ni catalyst powder, other crushed powder generated in the iron making process, dust collecting powder, and slag. 7. The method according to claim 5, wherein the content of the metal-containing powder is the balance of the content of the fibrous reinforcing material and the matrix binder. 8. The fibrous reinforcing material is at least one of fibrous industrial waste selected from the group consisting of papermaking sludge, wood chip dust, wood bark, sugar cane dross, straw, rice straw and waste cotton. It is a seed, The manufacturing method of any one of Claims 5-7. 9. The production method according to claim 5, wherein the matrix-type binder is coal-based pitch or petroleum-based pitch.