Blast furnace stemming prepared from regenerated refractories and preparation method thereof

Abstract

The invention discloses a blast furnace stemming prepared from regenerated refractories and a preparation method thereof. The blast furnace stemming is prepared from 30-50% of regenerated refractory, 5-10% of corundum, 10-20% of silicon carbide, 10-20% of clay, 5-8% of asphalt and 10-18% of coke. The additional binder of the blast furnace stemming is one or mixture of both of anthracene oil and tar, and accounts for 10-20 wt% of all the raw materials. The preparation method comprises the following steps: putting the raw materials into a mixing mill, premixing for 5 minutes, adding 95% of the additional binder, milling for 30 minutes, detecting the Marshall value, gradually adding the rest of additional binder until the Marshall value is acceptable, milling for 10 minutes, discharging, and forming with an extruder. The blast furnace stemming can lower the consumption of alumina, corundum, silicon carbide and other mineral resources; and the used refractories can be recovered, thereby lowering the waste discharge, promoting the cyclic utilization of resources, enhancing the blast-furnace smelting efficiency and lowering the stokehole refractory consumption.

Description

technical field [0001] The invention relates to blast furnace clay, in particular to a blast furnace clay prepared by using regenerated refractory materials and a preparation method thereof. Background technique [0002] Gun clay is a kind of unshaped refractory material used to block the iron hole of ironmaking blast furnace. Its composition can be divided into two parts: refractory aggregate and binder. The main raw materials of water gun mud are clay powder, broken clay refractory brick particles, and coke powder, and asphalt, high-alumina bauxite, silicon carbide, etc. are appropriately added, and water is used as a binder. Commonly used raw materials for anhydrous clay are generally corundum, high alumina bauxite, silicon carbide, clay and coke powder, etc. In order to improve the performance of the clay, increase its strength and corrosion resistance, metal silicon, metal aluminum, and sericite powder have begun to be used , ferrosilicon nitride and other raw material...

AI Technical Summary

Problems solved by technology

[0003] During the blast furnace smelting process, the taphole mud has a service life of about two to three hours each time, and it needs to go through several cycles of opening and filling every day. Under the erosion and erosion of high-temperature molten iron and slag, the taphole mud is continuously It is damaged and eventually forms slag, which is a one-time consumable material. It needs to consume a large amount of mineral resources such as bauxite, silicon carbide, and coke to prepare gun clay, which consumes a lot of resources.