Recycled alumina-chrome brick for Ausmelt furnace inner liner, and making method thereof

Abstract

The invention relates to a recycled alumina-chrome brick for an Ausmelt furnace inner liner, and a making method thereof. A technical scheme is characterized in that the recycled alumina-chrome brick comprises 66-76wt% of ferrochrome slag particles as aggregates, and also comprises 20-30wt% of ferrochrome slag fine powder, 1-2wt% of vanadium trioxide fine powder and 2.1-2.9wt% of yttria fine powder as a matrix. The method comprises the following steps: mixing above proportions of components of the matrix for 0.5-1h, adding the mixed matrix to the above proportion of the aggregates, and mixing the matrix and the aggregates for 5-8min; and adding alumina sol accounting for 5-7% of the total weight of the matrix and the aggregates, mixing for 8-10min, ageing the obtained mixture at 25-35DEG C for 0.3-0.5h, carrying out mechanical pressing, drying the obtained material at 100-110DEG C for 12-24h, and carrying out heat insulation at 1550-1650DEG C for 3-6h to obtain the recycled alumina-chrome brick for the Ausmelt furnace inner liner. The method has the characteristics of low cost and simple process; and the recycled alumina-chrome brick for an Ausmelt furnace inner liner, made in the invention, has good high temperature volume stability and strong slag corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of Ausmelt furnace lining. In particular, it relates to a regenerated aluminum-chrome brick for inner lining of an Ausmelt furnace and a preparation method thereof. Background technique [0002] Ausmelt Furnace is a matte smelting equipment in pyrotechnic copper smelting. The smelting temperature of the Ausmelt furnace is about 1200°C during the smelting process, and it bears the erosion and erosion of the melt during the copper smelting process, which reduces the service life of the lining bricks of the Ausmelt furnace. [0003] At present, the refractory bricks used for Ausmelt furnace lining are mainly magnesia-chrome bricks and magnesia-aluminum-titanium bricks. [0004] The magnesia-chrome brick is used as the refractory material for the inner lining of the Ausmelt furnace. Due to the low melting temperature and low viscosity of the slag during the melting process, it has strong wettability and permea...

AI Technical Summary

Problems solved by technology

Therefore, when in use, the osmotic metamorphic layer at the slag line is relatively thick, the structure is loose, and the structure is prone to peeling off, and the magnesia-chrome refractory material has strong hydrophilicity, and it will undergo hydrolysis reaction when it meets water, resulting in refractory bricks. "Powdering" and falling off

[0005] Magnesium-aluminum-titanium bricks are used as refractory materials for the lining of Ausmelt furnace, TiO 2 The addition of sintering aids reduces the sintering temperature of the lining refractory material, forming many closed microporous structures, improving the thermal shock resistance of the lining refractory material, but the existence of microcracks is also greatly reduced. Slag Erosion / Penetration Resistance of Refractories for Lining

[0006] In addition, the cost of refractory materials such as high-purity magnesia, chrome concentrate and high-purity spinel used in Ausmelt furnace lining refractory materials is relatively high, which increases the development cost of Ausmelt furnace lining refractory materials , thereby reducing the competitiveness of refractory materials used in Ausmelt furnace lining