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石英—粘土砖是用70％的石英砂(砂粒不大于0.45公厘)和30％耐火粘土制成。粘土的成分是:三氧化二铝(Al_2O_3)不少于30％,二氧化硅(SiO_2)不多于60％,其余是三氧化二铁(Fe_2O_3)、氧化钙(CaO)和氧化镁(MgO)。混合前先将石英砂和粘土进行干燥,再将石英砂用筛子去掉过大过小的砂粒,并把粘土碾成粉末。将石英砂和粘土按比例放入混砂机中,混合5分钟后加水5～7％,继续混合5分钟,这时混合材料的耐压强度应该是0.5～0.6公斤/公分~2。把混合好的材料放在木质或金属模型内用锤打实,做成炉砖,砖的半径要和冲天炉炉身半径一致,炉砖的形状和尺
Quartz-clay bricks are made of 70% quartz sand (sand not more than 0.45 mm) and 30% refractory clay. The composition of the clay is not less than 30% of aluminum oxide (Al2O3), not more than 60% of silicon dioxide (SiO2), and the rest is Fe2O3, CaO and MgO ). The quartz sand and clay are dried before mixing, and the quartz sand is then sieved to remove oversize grit and grind the clay into a powder. The quartz sand and clay into the sand mixer in proportion, 5 minutes after mixing water 5 ~ 7%, continue mixing for 5 minutes, then mixed material compressive strength should be 0.5 ~ 0.6 kg / cm ~ 2. The mixed material on the wooden or metal model with a hammer to make real, made of furnace brick, brick radius and cupola furnace radius of the same, the shape and size of furnace brick