طوب عازل من السيليكا خفيف الوزن

Lightweight silica bricks are also called silica insulation bricks. It is a lightweight refractory material with a silica content of more than 91% وكثافة حجمية أقل من 1.2 جم/سم3. The refractoriness and load softening temperature are not much different from ordinary طوب السيليكا with the same composition. لكن, due to the large number of pores, the compressive strength, مقاومة الخبث, المقاومة للتآكل, إلخ. are not as good as ordinary silica bricks, but the thermal shock resistance has been improved.

طوب عازل من السيليكا خفيف الوزن’ physical and chemical indicators

Silica Insulation Bricks
البند/الفهرس	RS-0.8	RS-1.0	RS-1.1	RS-1.15	RS-1.2
SiO2 %	≥88	≥91	≥91	≥91	≥91
الكثافة الظاهرية جم/سم3	≤0.85	≤1.00	≤1.10	≤1.15	≤1.20
قوة التكسير على البارد (Mpa).	≥1.0	≥2.0	≥3.0	≥5.0	≥5.0
توصيل حراري (W/MK) 350℃	0.55	0.55	0.60	0.65	0.70
Permanent Linear Change On Reheating (%)  1450℃*2h	0~+0.5	0~+0.5	0~+0.5	0~+0.5	0~+0.5
0.2Mpa Refractoriness Under Load T0.6℃	≥1400	≥1420	≥1460	≥1500	≥1520
20~1000℃ Thermal Expansion 10.6/℃	1.3	1.3	1.3	1.3	1.3

Application of lightweight silica bricks

Lightweight silica brick is a very special material, mainly used in the glass industry and steel industry. In most cases, lightweight silica bricks and dense silica bricks are used as structural layer parts. It is commonly used in the glass kiln industry, mainly for thermal insulation of the kiln vault, thereby reducing heat loss and increasing the efficiency of the melting process. In the steelmaking industry, lightweight silica bricks are used for lightweight walls and domes of hot blast furnaces.