And the test shows that the using condition of modified zirconium spinel brick is more bad than direct-bonded magnesia brick but as for chrome periclase-spinel compound brick (LYC) it is better.

试验表明，加锆改性尖晶石砖的使用情况较直接结合镁铬砖差，而加铬方镁石复合尖晶石砖(LYC砖)的使用效果好于直接结合镁铬砖。

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These chrome free bricks include dolomite bricks, magnesia spinel bricks and magnesia calcium zirconate bricks.

研究表明，用白云石砖、 尖晶石砖、镁锆钙砖代替镁铬砖，符合碱性砖无铬化的发展趋势。

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