Fiber-reinforced composite refractory castable for molten iron desulphurization lance and preparation method of fiber-reinforced composite refractory castable

Abstract

The invention relates to a fiber-reinforced composite refractory castable for a molten iron desulphurization lance and a preparation method of the fiber-reinforced composite refractory castable. According to the technical scheme, the method comprises the steps of dispersing the following raw materials in parts by weight: 1-4 parts of mullite powder, 3-5 parts of kyanite, 5-8 parts of fused dense corundum powder, 5-8 parts of alpha-Al2O3 micro powder, 4-7 parts of silica powder, 1-4 parts of silicon carbide powder and 5-7 parts of pure aluminum silicate cement and an additive into a flat container and mixing evenly by using a rake; adding the following raw materials in parts by weight: 10-15 parts of first-level bauxite chamotte, 30-38 parts of natural fused mullite, 20-25 parts of andalusite and 1-2 parts of high-purity fused mullite particles; and pouring the mixed materials into a stirrer for stirring to obtain the fiber-reinforced composite refractory castable for the molten iron desulphurization lance. The fiber-reinforced composite refractory castable is low in cost and wide in raw material source, the obtained product is good in mechanical property and thermal shock resistance, the service life of the molten iron desulphurization lance can be prolonged, and the desulphurization cost can be reduced.

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...

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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.