JPH0328490B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Field of Application> The present invention relates to a method for agglomerating granular metal or coke powder to which oils and fats have adhered so that they are convenient to handle and useful. <Prior art> Fibrous and linear materials such as powder are easy to handle because they can be agglomerated by simply compression molding, but fine powder metals and coke powder can be easily handled as they are. Agglomeration cannot be achieved by simply compressing. The following method is generally used to agglomerate such fine granular metal and coke powder. That is, a method using an inorganic binder such as cement or bentonite. A method using polyurethane thermosetting resin. A method using polyvinyl alcohol or carboxymethyl cellulose. A method using phenolic resin. It is. <Problems to be Solved by the Invention> Each of the above methods has advantages and disadvantages.
In other words, the method uses a large amount of binder (approximately 10% by weight), adds water, and pressurizes the powder after kneading. Because of the large amount of binder, the quality of the metal or coke powder deteriorates and the S content increases. In addition, in the case of raw materials with oil attached, the binder does not adhere well and strength does not increase, so it is necessary to burn off the oil and fat in advance using a kiln or the like or perform other removal operations. In addition, since this method hardens through a hydration reaction, its drop strength is low and it easily cracks or powders, making it inconvenient to handle, and if it is poured into molten metal, it instantly powders and becomes an agglomerate. The effects achieved are not fully realized. The next method is to use the raw materials
It is heated to 180-200℃ and mixed and molded by adding about 1-5% by weight of binder, but the binder is expensive, heating requires time and money, and raw materials with oil attached cannot be used. There are drawbacks such as the need to use special equipment such as a kiln because the oil volatilizes during heating. A further method is to add about 0.5% by weight of binder, add water and mix and mold, but since it will not harden if there is oil or fat attached, it must be removed by combustion using a kiln or other methods. It is necessary to remove fats and oils by the following means. In the other method, the binder used is expensive. <Means for solving the problems> The present invention aims to solve the above-mentioned problems and provide a method that is inexpensive and can easily agglomerate even raw materials with oil and fat attached. The gist is that the amount of oils and fats such that the total amount of oils and fats including the above-mentioned adhering fats and oils is 0.5 to 2.0% by weight of the total amount of oils and fats, either alone or as a mixture of powdery metal and coke powder to which oils and fats are attached. This is a method for agglomerating granular metal and coke powder, which is characterized by adding 0.5 to 1.0% by weight of a phenolic resin binder based on the total amount, mixing, and then press-molding. Note that the coke powder used in the present invention may be one with or without fats and oils attached thereto. <Examples and effects> The experiments conducted in developing the present invention and their results are shown below. Using granular metal and coke powder as shown in Table 1 below as raw materials, a mixture with the proportions shown in Table 2 was compression molded using a concrete compression testing machine to form a cylindrical specimen (36mmφ x 35mm). 3.5t/
cm ² ) and the crushing strength measured one day later is shown in Table 2. Note that the numbers in the adhering oil content section in Table 1 are based on the raw material.
The weight is shown relative to 100 parts by weight.

【table】

[Table] As is clear from the crushing strength shown in Table 2,
The raw material itself is not strong enough to handle. Next, phenolic resin (Hp-
3000H) and oil (A heavy oil tank sediment),
In the same way as described above for mixtures with various blending ratios,
Table 3 shows the crushing strength and drop test results after one day of a cylindrical specimen (36 mmφ x 35 mm) obtained by compression molding using a concrete compression tester of 3.5 t/cm ² .

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[Table] 〓◎: Items that are not damaged

Claims (1)

[Claims] 1 Adding oils and fats in an amount such that the total amount of oils and fats including the above-mentioned adhering oils and fats is 0.5 to 2.0% by weight of the total amount to the powdered metal and coke powder to which oils and fats are attached, either alone or in a mixture. A method for agglomerating granular metal and coke powder, which comprises adding a phenolic resin binder in an amount of 0.5 to 1.0% by weight of the total amount, mixing, and then press-molding.