Topower Insulating mullite Brick For Sale,Customer In United Arab Emirates Ordered 20 Tons
Insulating mullite firebrick puts alumina as main materials. After extrusion molding, they are fired at high temperature. Each surface of the brick is mechanically polished to the required size. Insulating firebricks can reduce the cost of the foundation, reduce the cross-section of the frame, and save reinforced concrete can significantly save the comprehensive cost of the building. It's a necessary refractory bricks for us to use in various kinds of furnace such as chemical industry,glass foundry and so on. These JM insulating firebrick does well in energy saving and heat preservation. The tolerance of temperature is from 1300 to 1400 degrees.
Lightweight insulating mullite bricks generally refer to refractory bricks with a density of less than 1.3x10³kg/m³. Compared with ordinary refractory bricks, its biggest feature is "lightness". Don't underestimate the word "lightness", which contains its unique structure and performance. Lightweight refractory bricks have the characteristics of high porosity, low thermal conductivity, good thermal insulation and certain compressive strength.
The production process of lightweight refractory bricks is not a simple matter. It requires careful carving through multiple processes. Among them, the most commonly used production methods are burnout additives, foam method and chemical method.
The burnout additive method is to add easily burnout additives such as sawdust, petroleum coke, charcoal, bituminous coal, lignin, etc. to the clay material for making bricks. During the firing process, these additives will be burned out, so that the product has a higher porosity. This method is relatively simple to operate and has low cost. It is one of the common methods for producing lightweight refractory bricks.
The foam method is to add foaming agents such as rosin soap, saponin, polystyrene, etc. to the mud for brick making, and foam it mechanically, and obtain porous products after firing. The lightweight refractory bricks produced by this method have more uniform pores and more stable performance, but the production process is relatively complicated and the cost is also high.
The chemical method is to use chemical reactions that can produce gas to obtain porous products in the brick making process. Usually, carbonates (such as dolomite, magnesite) and inorganic acids are added to the mud as foaming agents, and semi-hydrated gypsum or hydraulic substances (such as cement) are used as stabilizers. The lightweight refractory bricks produced by this method have higher strength and better thermal insulation performance, but the requirements for production processes and equipment are higher.
The advantages of lightweight refractory insulating mullite bricks are obvious. First of all, it has excellent thermal insulation performance and can greatly reduce the energy consumption of industrial kilns. According to statistics, the heat storage loss of industrial kiln masonry and the heat dissipation loss of the furnace surface generally account for about 24~45% of fuel consumption. Using lightweight bricks with low thermal conductivity and small heat capacity as furnace structure materials can save a lot of fuel consumption. Secondly, lightweight refractory bricks can reduce the weight of the furnace body, simplify the structure of the kiln, and reduce the investment cost and maintenance cost of the equipment. At the same time, since the kiln can heat up and cool quickly, it can also improve the production efficiency of the equipment.
However, lightweight refractory insulating mullite bricks are not perfect. It has a large porosity, loose structure, and low mechanical strength. It cannot be used in parts that directly contact slag and liquid metal, nor can it be used for load-bearing structures. In addition, lightweight refractory bricks have poor wear resistance and are not suitable for parts that are in contact with furnace charge and are severely worn. These limitations limit the application scope of lightweight refractory bricks to a certain extent, but as long as we correctly understand and use it, we can give full play to its advantages and bring greater benefits to industrial production.
