用后硅砖在铝电解槽用防渗浇注料中的应用
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摘要
传统浇注料使用煅烧矾土基料,由于颗粒级配比较简单,浇注料采用较多的水泥和水来填充,所形成的堆积孔隙比较大,在使用过程中不能很好的防止铝液和电解质的渗透。采用高铝水泥结合浇注料在500℃以下,由于脱除大量结合水造成结合强度下降,当温度升至900～1 100℃之间时高铝水泥结合强度大部分损失。本试验采用硅砖替代部分高铝矾土,通过在浇注料基质中引入减水剂、硅灰等添加剂,有效提高了产品使用性能,满足铝电解槽浇注料技术指标,社会效应和经济效益明显。
The traditional castables are prepared with calcined bauxite base material with simple particle size distribution,and filled with a lot of cement and water,resulting in larger accumulated voids. The penetration of liquid aluminium and electrolyte can not be well prevented during use. In addition,the bonding strength of high alumina cement-bonded castables is reduced due to the removal of a large amount of bonding water. When the temperature reaches between 900 ℃ and 1 100 ℃,most of the high aluminum cement bonding strength will be lost. By partly replacing the bauxite with silicon bricks and introducing water reducing agent and superfine powder into the matrix,the product performance can be effectively improved and the castables for aluminium reduction cell can be produced. The social effect and economic benefit are obvious.
The traditional castables are prepared with calcined bauxite base material with simple particle size distribution,and filled with a lot of cement and water,resulting in larger accumulated voids. The penetration of liquid aluminium and electrolyte can not be well prevented during use. In addition,the bonding strength of high alumina cement-bonded castables is reduced due to the removal of a large amount of bonding water. When the temperature reaches between 900 ℃ and 1 100 ℃,most of the high aluminum cement bonding strength will be lost. By partly replacing the bauxite with silicon bricks and introducing water reducing agent and superfine powder into the matrix,the product performance can be effectively improved and the castables for aluminium reduction cell can be produced. The social effect and economic benefit are obvious.
引文