High-strength slag-stopping ball used for converter steelmaking and preparation method thereof

Abstract

The invention discloses a high-strength slag-stopping ball used for converter steelmaking and a preparation method thereof. The slag-stopping ball is prepared from the raw materials including, by weight, 15-25 parts of zirconite powder, 42-54 parts of aluminate cement, 14-22 parts of desulfurized petroleum coke residue, 11-19 parts of andalusite, 16-24 parts of cordierite, 13-21 parts of silicon carbide, 10-15 parts of serpentinite, 8-14 parts of asbestos tailings, 5-10 parts of waste mortar, 17-26 parts of knar clay, 9-18 parts of halloysite ore slag, 6-12 parts of polyethylene imine, and 5-10 parts of hydroxycellulose sodium. The slag-stopping ball has reasonable formula and scientific process. With the raw materials including the zirconite powder, the andalusite, the cordierite, the serpentinite, the asbestos tailings, the halloysite ore slag, the desulfurized petroleum coke residue and the like, the slag-stopping ball has high compressive strength, has good slag-stopping performance and is not less than 95% in slag-stopping rate, can effectively reduce the amount of slag during tapping and reduce impurities in steel, and further improves the quality of molten steel and recycling rate of alloy.

Description

technical field [0001] The invention relates to a slag blocking ball and a preparation method thereof, in particular to a high-strength slag blocking ball for converter steelmaking and a preparation method thereof. Background technique [0002] When tapping the converter, in order to prevent the steel slag from flowing into the ladle and generate sulfur and phosphorus back, to remove metal inclusions in the molten steel, to improve the quality of the molten steel and the yield of ferroalloy, and to smelt some special steel types, it is necessary to block the slag, so Use slag blocking ball products to protect the purity of molten steel. [0003] The density of the slag blocking ball is between the molten steel and the steel slag, and the tapping hole is blocked at the end of tapping to prevent the slag from flowing into the ladle. The slag blocking ball is spherical, with grooves distributed on the outside, which are in the shape of rice, and reach the tapping hole in the w...

AI Technical Summary

Problems solved by technology

However, the slag blocking balls currently on the market have the disadvantage of low strength, and are broken by external forces during use, which greatly affects the purity of molten steel