Refractory bricks are indispensable materials for the construction of industrial furnaces. Before laying the refractory bricks, prepare the slurry to be used. The maximum particle size of the mud should not exceed 20% of the masonry joints. The physical and chemical properties of the mud should match the type and quality of refractory bricks. When buying refractory bricks, it is best to appoint the manufacturer to prepare the corresponding refractory mortar to prevent mixing.
1. Refractory mud preparation procedure
The general requirements for the preparation of refractory mud should be determined according to the type of masonry, and the consistency and liquid content of the mud should be determined according to tests. At the same time, check whether the masonry performance (bonding time) of the grouting meets the masonry requirements. The bonding time of grouting depends on the material and size of refractory products, generally should not exceed 2 minutes, and the quantity and consistency of different grouting should be selected according to the type of masonry.
The determination of mud consistency is carried out in accordance with the requirements of the current national industry standard "Test Method for Refractory Mud Consistency". The slurry bonding time is determined according to the requirements of the current national industry standard "Test Method for Refractory Mud Bonding Time".
There are two methods for preparing mud: natural combination of water and chemical combination. In the masonry of industrial furnaces and kilns, most of them are prepared by chemical combination, and corresponding coagulant is added. It is characterized by fast solidification speed, high bonding strength, and no embrittlement after high temperature sintering. However, after the application of hydrogel mortar masonry, the high temperature water in the kiln volatilizes, the mortar masonry is easy to be brittle, and the masonry is not firm. In addition, the refractory slurry prepared on the same day should be used up in a day.
2. Calculation method of refractory mud dosage
At present, there is no good method to measure the demand for refractory mud of the entire industrial furnace. Due to the different types of industrial furnaces and bricks, special-shaped refractory bricks can be constructed. The non-standard refractory bricks or masonry positions are different, and the amount of refractory mud for the furnace wall single brick masonry is also different. The bottom of the furnace is different. At present, the basis for the use of refractory clay in industrial furnace project budgets or estimates is the standard refractory bricks used for the construction of furnace walls. In addition, the joints of masonry mortar should also be referred to, which is the basic parameter to measure the refractory mortar used in standard refractory bricks. Masonry mortar joints should be positioned first. The first-level ash seam is less than 1mm, the second-level ash seam is less than 2mm, and the third-level ash seam is less than 3mm. For these three kinds of mortar joints, clay refractory bricks or high alumina refractory bricks usually adopt secondary mortar joints.
For example, to calculate the total amount of refractory mortar required for 1000 pieces of high alumina refractory bricks, you must first know the calculation method: a=masonry mortar joint (2mm) B= brick size single-sided area (T-3 size) 230*114 *65)
C=The quality of refractory mud used (the quality of high alumina mud is 2300kg/m3) d=The amount of mud required for each brick. The final mud consumption d=230*114*2*2500=0.13kg (consumption per block). The total amount of 1000 high-alumina refractory bricks is about 130kg of refractory slurry. This calculation method is a basic principle calculation method, and its unit consumption should be more than 10% of the theoretical data.
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