Electric smelting magenisum aluminum spinel brick for coal water slurry gasifying furnace and preparation method thereof

Abstract

The invention particularly relates to an electric smelting magenisum aluminum spinel brick for a coal water slurry gasifying furnace and a preparation method of the electric smelting magenisum aluminum spinel brick. The technical scheme is as follows: the preparation method comprises the following steps of: taking 58-74 wt% of industrial aluminum oxide powder and 26-42 wt% of light roasting magenisum oxide powder as raw materials; additionally adding carbon powder which is 0.5-3.0 wt% of the raw materials; uniformly agitating; putting the mixture into an electric arc furnace and electrically smelting by utilizing a 100-220 V voltage until all the raw materials are fused; continually smelting for 30-60 minutes and casting a smelted high-temperature synthetic material into a casting mould; then, placing the material into a tunnel kiln to be annealed by a belt mould under the condition of 1350-1550 DEG C, wherein the annealing period is 72-120 hours; discharging the material out of the kiln under the condition of 30-80 DEG C and de-molding; and finally, carrying out mechanical machining on a de-molded product to obtain the electric smelting magenisum aluminum spinel brick. The electric smelting magenisum aluminum spinel brick prepared by the invention has the characteristics of low apparent porosity, strong anti-stripping capability and good anti-coal-slag penetrating performance, and can better adapt to a working environment of a hot surface of a liner of the coal water slurry gasifying furnace.

Description

technical field [0001] The invention belongs to the technical field of fused magnesia-aluminum spinel refractory materials, and in particular relates to a fused magnesia-aluminum spinel brick for a coal-water slurry gasifier and a preparation method thereof. Background technique [0002] Coal-water slurry gasifier uses coal-water slurry as raw material to produce CO and H 2 Device for mixing gases. Its lining hot surface refractory is used in very harsh conditions, such as the working temperature in the furnace can reach 1550 ° C, the gas pressure in the furnace can reach 8 MPa, the reducing atmosphere is strong, the melting point of coal slag is low, the viscosity is small and the acidity is strong; at the same time The refractories lining the hot face are also subject to high-velocity air scour and sharp fluctuations in temperature. [0003] At present, high chrome bricks, also known as Cr 2 0 3 -Al 2 0 3 -ZrO 2 Brick, although the solubility of the brick in coal sl...

AI Technical Summary

Problems solved by technology

Since the structure and performance of the metamorphic layer are quite different from those of the original brick layer, structural stress will inevitably result in cracks on the hot surface of the brick lining. As the cracks expand, part of the refractory material will separate from the brick body, forming peeling, resulting in Severe damage to brick lining

[0004] In addition, trivalent chromium and hexavalent chromium ions have a strong carcinogenic effect on the human body and organisms

Cr in high chrome brick 2 0 3 The content is very high, and a large amount of use is bound to seriously pollute the environment and threaten the health of humans and animals