Tap-hole clay for large blast furnace ironmaking and preparation method of tap-hole clay

Abstract

The invention discloses tap-hole clay for large blast furnace ironmaking and a preparation method of the tap-hole clay. The tap-hole clay is prepared from the following components in parts by mass: 15-20 parts of 3-0mm brown corundum, 15-20 parts of 3-0mm light clay, 5-8 parts of 1-0mm magnesium oxide, 10-15 parts of 1-0mm sillimanite, 8-15 parts of 0.5-0mm magnesium iron oxide, 8-13 parts of meta-clay powder, 3-7 parts of cobalt aluminum oxide powder, 5-10 parts of strontium carbonate powder, 7-25 parts of flake graphite powder, 5-10 parts of composite carbon powder, 1-2 parts of low-temperature asphalt powder and 13-16 parts of modified tar; and 100 parts of the modified tar is prepared by blending the following substances in parts by mass: 98 parts of tar, 1 part of ethylene glycol and 1 part of N-methylpyrrolidinone. The tap-hole clay can protect an iron outlet with the pore size being stable and not liable to change, so that iron discharge is stable, and in addition, in the long-time storage process, the use performance and the serviceability of taphole loam are not lowered.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and in particular relates to a plugging mud for large-scale blast furnace ironmaking and a preparation method thereof. Background technique [0002] The blast furnace is the main equipment for smelting molten iron. After the blast furnace smelts iron, the molten iron needs to be released through the blast furnace taphole. In order to ensure continuous smelting, the iron taphole must be blocked. The material that blocks the taphole is the plugging hole. mud. At present, when smelting some special iron ores, such as iron ores with high vanadium and titanium content, because the melting point of vanadium and titanium oxides is very high, which is higher than the tapping temperature, the iron cannot be melted during tapping, and will be deposited on the tapping surface. The tap hole, resulting in thicker knots, resulting in changes in the hole diameter of the tap hole; generally, the ...

AI Technical Summary

Problems solved by technology

At present, when smelting some special iron ores, such as iron ores with high vanadium and titanium content, because the melting point of vanadium and titanium oxides is very high, which is higher than the tapping temperature, the iron cannot be melted during tapping, and will be deposited on the tapping surface. The tap hole, resulting in thicker knots, resulting in changes in the hole diameter of the tap hole; generally, the tap hole cannot be dealt with in time at high temperatures, and the change of the tap hole seriously affects the stable tapping of the tap hole, resulting in irregularities in tapping. It is very easy to cause molten iron to run in a large flow and spray rockets, which brings difficulties to the production plan of normal tapping of blast furnace