Performance and application of silica brick and silica brick thermal conductivity Jul 21, 2022 Views: 104 As the main refractory of the coke oven, silica brick plays a vital role in the heat utilization rate of the coke oven. By adding additives, the internal structure of silica brick is optimized and thermal conductivity is improved. The thermal conductivity of the manufactured high thermal conductivity silica brick increases by about 15% compared to the ordinary silica brick at 1100°C. It is measured and calculated that when the silicon brick with high thermal conductivity is placed in the furnace wall of the carbonization chamber, the flame temperature in the combustion chamber can be reduced by about 40 degrees Celsius. Therefore, the high thermal conductivity silicon brick can fully serve the purpose of energy saving and low carbon. Through experimental comparison, the thermal conductivity value of high thermal conductivity silica brick at 1100°C is 1.7-2.1w/m.k, and the average value is 1.9w/m.k. It is obvious that the high thermal conductivity of silica brick has high thermal conductivity. 
and has realized the effect of saving energy. The microstructure is denser than ordinary silica brick, and the porosity is low, which effectively improves thermal conductivity. Dense Silica Refractory Brick with High Thermal Conductivity Silica-based thermal insulation refractory bricks refers to thermal insulation refractory products made of silica as the main raw material and SiO2 less than 91%. It preserves to a large extent. The starting temperature of the load is high, and during the hot process, the volume is small, and this improves the integrity of the furnace. In the manufacture of silica thermal insulation refractory bricks, fine powdered silica is used as a raw material. It is used and a part of waste silica bricks or firebrick powder, silica heat insulation waste, minerals and wear additives are added to it. According to a certain ratio, add water to the mixer to make mud, which is made by mechanical or manual mold. After drying the brick, the residual moisture before loading into the kiln is less than 0.5%. 
In order to avoid the strong volumetric expansion caused by the change and conversion of polycrystalline SiO2 and the creation of cracks in the product, an increase in temperature and a lower speed during baking are required. Dense silica refractory brick with high thermal conductivity: 1) Silicon oxide is above 94%. 2) Good resistance to acid erosion. 3) High softening point Natural quartzites (for silica bricks) and chemically pure quartz sands (the main ingredients of clear silica products) have been used to produce silica products. Quality quartzites have SiO2 greater than 97% SiO2. A distinction is made in terms of primary occurrence between coarsely crystalline quartzite without mortar (mostly tectonically solidified) and finely crystalline mortared quartzite (purely chemically solidified). Further features are specified in this connection. The transition between these two types is a stable process. Quartzites mineralogically consist of quartz (low modification), while silica firebricks mainly consist of tridymite and cristobalite. Therefore, special attention should be paid to the complex polymorphism of SiO2. It is characterized by a large number of reversible and irreversible modification changes, which in some cases are accompanied by significant volume changes (Table 1). Therefore, the overall porosity of quality quartzites increases from 1 to 2 percent to about 14 percent (by volume). In addition to the firing conditions, the kinetics of quartz transformation is always dependent on the specific parameters of raw materials such as the size and distribution of quartz crystals and the type, quantity and distribution of mineral impurities. The latter are mostly located along the crystal boundaries instead of crystal components. Mortared quartzites transform faster than coarse crystalline quartzites due to their high internal surface area and fine dispersed impurities. with crossed polarizers, Quartzites that form under high pressure show insulating destruction of quartz crystals (lattice faults) under a thin-section microscope. The quartz transformation of such quartzites is better than that of comparable quartzites without bed extinction. Spontaneously metamorphosing quartzites are not suitable for brick production, because severe cracking cannot be prevented even with more precise temperature control. 
silica bricks properties
Properties of silica brick Physical properties of silica brick Silica bricks have a thermal expansion of 12 to 15 mm/m at temperatures of 800 to 1000 degrees Celsius, but they exhibit negative expansion at temperatures higher than their limits. At temperatures below 500 degrees Celsius, these bricks have very low resistance to thermal shock, but at temperatures above 600 or 700 degrees, their resistance to thermal shock increases and they show good and acceptable shock resistance. Therefore, the heating of furnaces covered with silicon bricks should be done slowly and carefully. The density of silica brick is 2.2 to 2.35 grams per cubic centimeter Chemical properties of silica brick Silicon oxide is an acidic oxide. Therefore, the chemical resistance of silica brick against acid melts is very good. But vapors and gases containing alkaline compounds cause corrosion of these bricks. This type of refractory brick is extremely popular and has a special place in construction and industrial works. In the past, silica coated refractory bricks were used for the inner walls of steel production furnaces. Due to its thermal conductivity and impermeability against gases, silica bricks are especially suitable for covering the inner walls of glass pulp production furnaces in glass factories, coke gas furnaces and ceramic production furnaces, hot air blowers and furnace roofs. Electric are used. After the important applications of silicon bricks, we can mention coking furnaces, gas furnaces, the roof of glass melting furnaces, the hot air blowing device of blast furnaces, and the roof of electric arc furnaces. Silica refractory bricks are also classified as refractory bricks that have many applications in the industry. Silica refractory bricks have different prices in each city and province. To buy different types of silica bricks in each region, you must have up-to-date information about their prices because bricks, like any product, may change in price every day. 
You can contact us to know the latest price of silica refractory bricks. In general, refractory bricks or refractory bricks are made of refractory soil, which is a kind of quality porcelain or ceramic. The firing temperature of firebricks was around 1500 degrees Celsius and the basis of the materials used in making these bricks are very special minerals and firebrick mineral pumice. These materials have high resistance to maintain physical and chemical properties. Decorative brick is also a type of brick that is used in the facade of the building and has an aesthetic aspect. Silica brick is one of the most common types of acid refractories, whose main raw materials are quartzite or refractory silica stones, which were heavily used in various industries in the past, especially in the steel industry.