Non-oxide composite refractory materials for molten iron chute

Abstract

The invention relates to a technology for preparation of refractory material, and especially to a composite refractory of non-oxidized substance used in a hot-metal launder of consecutive pre-processing. The composite refractory of non-oxidized substance used in a hot-metal launder is characterized in that it contains (wt %) 50-70 % of corundum material, 15-30 % of silicon carbide, 3-10 % of silicon nitride, 3-10 % of silicon nitride tiny powder, 1-5 % of charcoal material, 1-3 % of silicon anti-oxidization agent, 6-15 % of additional silicasol astringent, and a few additives containing anti-knock agent and dispersing agent with 0.15-1.5 % by wt. The refractory material of the said invention can resist the erosion of the hot-metal and the molten ash and is of strong erosion ability, uniform and high-integrity structure, high intensity at a medium-high-temperature, strong stability of resistance to heat shocks and of volume of material, and strong resistance to oxidation, so it adapts to the process requirement of the desired hot-metal launder of consecutive pre-processing.

Description

(1) Technical field [0001] The invention relates to a refractory material manufacturing technology, in particular to a non-oxide composite refractory material for molten iron launders in continuous pretreatment of molten iron. (2) Background technology [0002] In the iron and steel smelting process, molten iron pretreatment technology is widely used. However, the technologies currently used in the world are segmented, cross-regional, and discontinuous processes, so there are certain defects in processing efficiency, energy saving, automation, and simplification. Japan has recently put forward a brand-new concept of "continuous treatment of molten iron", through intensification and continuousization of the discontinuous desiliconization, dephosphorization and desulfurization of molten iron across regions, so as to achieve the minimum investment in equipment and the effective use of energy and resources. Purpose. [0003] Although the existing molten iron pretreatment refra...

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Problems solved by technology

But silica brings a lot of SiO 2 , which is detrimental to the slag resistance and iron corrosion of the material, thus affecting the service life; the steel fiber is added to improve the thermal shock resistance, but when the molten iron is above 1400°C, the steel fiber is easy to oxidize and deteriorate, which will affect the material performance instead.

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