Briquette as material for steel making and method for production thereof

Abstract

Cotton-like aggregates (B) containing grinding chips from an iron-based metal and a grinding fluid containing oil and water are compression molded thereby forming a brittle compact (C) in which the fibrous grinding chips are roughly sheared and which is removed of excessive water and oil. The brittle compact (C) is crushed for further finely shearing the grinding chips and then, the resultant grinding chips are mixed with a solidification assistant(D) for obtaining powder (E) containing the solidification assistant(D). The powder (E) is solidified by compression molding, thereby forming a water-containing briquette (F). A briquette (A) for use as steelmaking material, which contains powdery pure iron and oil, is obtained by removing the water from the water-containing briquette (F). Without crushing the brittle compact (C), it is also possible to form the briquette (A) for use as steelmaking material by impregnating the brittle compact (C) with the solidification assistant(D) and then drying the compact.

Description

【Technical field】 [0001] The present invention relates to iron powder bricks for steelmaking raw materials and a manufacturing method thereof, and particularly relates to a technique for effectively utilizing grinding chips of iron-based metals. 【Background technique】 [0002] Chips produced during grinding (hereinafter referred to as concepts including grinding, post-grinding, and buffing) bearing steel or carburized steel and other iron-based metals are used as cotton-like grinding fluids and abrasives containing water and oil. The (fibrous) aggregates are recovered. The spongy agglomerates are experimentally reused as raw materials for steelmaking because they contain a large amount of pure iron. However, since the spongy aggregates contain a large amount of water, when they are put into a blast furnace, the water causes a problem of so-called bumping (steam explosion). Therefore, it is considered to use methods such as centrifugation to remove the water in the spongy a...

AI Technical Summary

Problems solved by technology

[0007] However, such burying is not good from the viewpoint of efficient use of resources.

In addition to causing environmental degradation, there is also the problem of high processing costs

Especially for dust collection, since it contains heavy metals, it requires a special industrial landfill to dispose of the waste, and there is a problem of higher disposal costs.

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