Fiber composite toughened refractory castable for molten iron desulfurization spray gun and preparation method thereof

Abstract

The invention relates to a fiber composite toughened refractory castable for a molten iron desulfurization spray gun and a preparation method thereof. Its technical plan is: 1~4 parts by mass of high-purity fused mullite powder, 3~5 parts by mass of kyanite, 5~8 parts by mass of fused dense corundum fine powder, 5~8 parts by mass of α‑Al 2 o 3 Micropowder, 4~7 parts of silicon micropowder, 1~4 parts of silicon carbide powder and 5~7 parts of pure calcium aluminate cement and additives are scattered into the flat bottom container and mixed with a rake; then add 10~ 15 parts of first-grade high-alumina bauxite clinker, 30-38 parts of natural fused mullite, 20-25 parts of andalusite and 1-2 parts of high-purity fused mullite particles Mix with a rake; pour it into a mixer and stir to get the fiber composite toughened refractory castable for molten iron desulfurization spray gun. The invention has low cost and wide sources of raw materials, the manufactured product has good mechanical properties and thermal shock stability, can prolong the service life of the molten iron desulfurization spray gun and reduce the desulfurization cost.

Description

technical field [0001] The invention relates to the technical field of refractory castables. In particular, it relates to a fiber composite toughened refractory castable for a molten iron desulfurization spray gun and a preparation method thereof. Background technique [0002] According to the type of desulfurizer and the structure of the molten iron container, the desulfurization process is divided into calcium-based or magnesium-based mixed, calcium-based or magnesium-based composite, metal particle magnesium pure spray, etc.; the corresponding spray gun structure is: oblique single nozzle, straight Inverted T-shaped double nozzles, inverted Y-shaped double nozzles, straight-through single nozzles and gasification chamber nozzles, etc. Although the structures are different, all kinds of molten iron desulfurization spray guns are composite structures composed of a metal gun core and a refractory material gun lining wrapped around the metal gun core. Among them, the main f...

AI Technical Summary

Problems solved by technology

However, the raw materials used are expensive, and there is no description of the shape, fiber diameter and length of carbon nanofibers, how to obtain them, and how to uniformly disperse them in the castable. The detection equipment is also difficult to complete the detection, and at the same time, it fails to provide relevant test results support for the thermal shock stability of concern

[0006] "A casting material for blast furnace iron trough containing carbon fiber and its preparation method" (CN 104072177 A) patented technology, which uses carbon fiber monofilament TiO in an inert atmosphere 2 Sol impregnation solves the problem of poor wettability of carbon fibers, and solves the problem of stirring, winding and knotting by cutting carbon fibers and controlling the amount of addition. However, the preparation process is complicated and the cost is high, and no specific method for uniform dispersion of carbon fibers is provided.