JPS591644A - Briquette as starting material for melting - Google Patents

Abstract

PURPOSE:To utilize a fine-grained metal such as shavings as a starting material for melting by briquetting the metal together with a small amount of an exothermic reagent. CONSTITUTION:A fine-grained metal 1 such as reduced iron 1' or cast iron shavings 1'' is mixed with a small amount of an exothermic reagent 2 such as ''Thermit'' and press-molded to form briquettes 3. The briquettes 3 are charged into a melting furnace such as a cupola or an electric furnace and heated. When the briquettes 3 attain a certain temp. or above, the reagent 2 generates heat and the briquettes 3 are melted at once. By this method the melting speed is reduced and is rather increased, and melting at high temp. is enabled, so a high quality casting of cast iron is obtd. The consumption of a heat source in the melting furnace can be reduced by the exothermic action of the exothermic reagent.

Description

[Detailed description of the invention] The present invention relates to #IIs raw material briquettes.

When small metal particles, such as reduced iron or cast iron cuttings, are charged into the cupola, the furnace becomes clogged and ventilation is blocked. Nine, because the surface area of the raw material is small,
Vigorous oxidation occurs in the furnace, increasing the amount of slag generated.

By the way, is it possible to solve the above problem by press-molding small metal particles such as reduced iron or cast iron cutting waste into briquettes into a size suitable for the diameter of the cupola furnace? When the waste is made into briquettes, it becomes porous and has poor thermal conductivity, low density, and low specific gravity. Therefore, when this is charged into a cupola, its dissolution rate is low compared to pig iron and steel scrap, which are the charges for conventional cupolas, and it cannot be put to practical use as it is.

The present invention aims to contribute to energy saving and resource saving by using small particles of gold 4 such as reduced iron or cast iron cutting waste as a melting raw material.
Briquettes (3) are obtained by adding a small amount of exothermic agent 12) and press-molding the briquettes (3). As small metal particles, for example, reduced iron mouth), i is cast iron cutting waste [11] Ru. In addition, as the exothermic agent (2),
Thermite #l is used. Additionally, if necessary, a metal for adjusting the composition such as ferrosilicon or ferromanganese may be added to the above mixture. In this way, cast iron castings with the target composition and material can be obtained immediately after melting. can get.

The small metal pellets to which a small amount of the exothermic agent is added are pressure-molded to form briquettes [L, cupola, or i4i].
When charged into a melting furnace such as an air furnace, the briquettes (3) are heated, and when the temperature reaches about 2 θQC or more, the exothermic agent generates heat and the briquettes (3) are immediately melted to Vcm.

For the first reason, when the melted raw material briquette according to the present invention is used, the melting rate does not decrease, but rather increases the melting rate and enables high-temperature melting, so that good cast iron castings can be obtained. Moreover, due to the exothermic effect of the exothermic agent, the amount of suks used as a heat source can be reduced in Kievora, and the power consumption can be reduced in Electricity P, resulting in large energy savings. can. In addition, it is possible to use cast iron cutting waste, which contributes to resource saving.

[Brief explanation of drawings]

The drawings are cross-sectional views of briquettes according to the present invention, in which FIG. 1 shows a briquette using reduction tips as small metal particles, and FIG. 2 shows a briquette using cast iron cuttings. 11)・-Small metal particles, 11)-・Reduced iron, (1)・・
Cast iron cuttings, (!1... exothermic agent, (3)... briquettes, special silicate J person Yoshida Iron Works Co., Ltd. Figure 1

Claims (1)

[Claims] 111 IsyK material briquettes characterized by adding a small amount of exothermic agent to small particles of metal and molding the resulting briquettes under pressure.