No-water stemming material for blast furnace taphole and its prepn

Abstract

The present invention relates to amorphous refractory material, and is especially one kind of no-water stemming material for blast furnace taphole and its preparation process. The no-water stemming material is prepared with coke powder 15-25 wt%, clay 10-20 wt%, bauxite corundum 20-36 wt%, silicon carbide 10-20 wt%, asphalt 8-16 wt%, sericite 5-9 wt%, additive 1-5 wt% and binding agent 12-22 wt%, and through crushing, sieving, pre-mixing, rolling, kneading and extruding. The no-water stemming material has excellent plasticity and sintering performance, high strength at high and middle temperature and high slag and molten iron flush resistance, and can meet the requirement of high strength smelting in blast furnace.

Description

Technical field: [0001] The invention relates to an unshaped refractory material, in particular to an anhydrous taphole mud for a blast furnace taphole and a preparation method thereof. Background technique: [0002] With the continuous strengthening of blast furnace smelting, the requirements for blast furnace taphole clay are getting higher and higher; the taphole clay is required to have good workability, so that the taphole can be fully filled; the volume stability is good, and no shrinkage occurs during the sintering process. ; Good sintering performance, can burn through quickly, has fast drying and fast hardening and high high temperature strength; good opening performance, easy to open holes; has the characteristics of slag resistance, molten iron erosion, erosion, and oxidation resistance. [0003] Gun mud can be divided into water gun mud and anhydrous gun mud according to the binder. In addition, there is also gun mud that uses oil and water as binders at the same...

AI Technical Summary

Problems solved by technology

Water-filled taphole clay is made by mixing and rolling carbon materials, refractory aggregates, soft clay, etc. The amount of water added to the taphole clay is usually as much as about 20%, so there are often the following defects: 1) There is no sintering during tapping 2) The output of blast furnace increases, the flow rate of slag and iron increases, the depth of the iron hole is not enough, and it is easy to be washed into a trumpet shape, making the iron hole difficult to maintain; 3) The ability to resist chemical erosion of slag is not enough

Compared with the water-containing gun mud, the anhydrous gun mud has the advantages of high temperature strength, erosion resistance, not easy to expand the diameter and not easy to damp the iron mouth. The patent with the publication number CN1523120A reports that brown corundum, mullite, etc. are used as the main raw materials. Anthracene oil is the anhydrous gunpowder made by hot rolling as a binder; the patent publication No. CN1641046A reports using fused corundum, silicon carbide, coke powder, etc. as main raw materials, adding a small amount of talcum powder, microcrystalline graphite etc. to improve the workability of the gun mud, and to produce anhydrous gun mud with the mixed oil of coal tar and anthracene oil as a binding agent, which has obtained better use effects, but there are also some shortcomings: one is to use tar or tar and anthracene oil The mixed oil of oil is used as the binder of anhydrous gun mud. The early strength of the gun mud is low and the production is slow. It takes a long time to press the gun mud, and it also causes serious environmental pollution problems; the medium temperature of the gun mud in the above two patents The strength mainly depends on the sinterability of sericite and soft clay, but the introduction of too much sericite and soft clay may lead to excessive shrinkage of the gun mud and cause broken iron holes, and on the other hand, more The liquid phase will inevitably reduce the high temperature strength of the clay and the scouring performance of slag iron; in addition, the above patents are only made by rolling the anhydrous clay, and there are obvious deficiencies