These chrome free bricks include dolomite bricks, magnesiaspinel 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。
2
Natural magnesiaspinel rarely found that magnesium aluminum spinel in industrial application are all synthetic.
天然镁砂尖晶石极少发现，工业上应用的铝镁尖晶石全部都是人工合成的。
3
The quality is a burnt magnesiaspinel brick made from fused magnesia, low iron sintered magnesia and fused hercynite. This synthetic hercynite is a patent by RHI Refractories.