When choosing refractory brick laying materials, we should pay attention to the following aspects, First, we should adapt to local conditions, self-reliance, pay attention to the characteristics of regional resources, rationally choose bricklaying furnace refractory materials. Secondly, considering the working characteristics of the furnace masonry, it is technically correct.
Different types of heating furnaces and different parts of the furnace body have different working conditions, so the use of bricklaying refractory materials should fully consider the characteristics of masonry work.
The working temperature of different parts of the heating furnace is different. When selecting masonry refractory materials for furnace, different types and grades of refractory products should be used. For masonry or parts of furnaces with high temperature stress, refractory materials with better thermal stability should be used. For refractory materials with a large load, the material with high compressive strength should be selected. When choosing, consider the softening point of the load of the refractory material.
Some masonry, such as the bottom of the shock-type heat treatment furnace, must withstand the mechanical vibration and the impact of the workpiece, and the ram concrete refractory concrete tamping structure can be used. At the bottom of the ring furnace, the impact and friction of the workpiece during loading and unloading should be considered. High alumina brick masonry or chrome ore sand can be used for knotting. For some parts with particularly serious mechanical damage, the convenience of partial replacement or repair should be considered.
The part of the masonry that contacts the erosive medium shall be selected from refractory materials according to the nature of the chemical reaction, such as the soaking furnace bottom, the soaking bed of the push type continuous heating furnace, the hearth of the reverberatory furnace. Due to the oxidation of molten iron slag, etc. It is best to use masonry refractory bricks, and the ability of various refractory products to resist chemical corrosion can be found in the refractory material of the furnace.
In addition, we must also consider the special requirements of some furnaces, such as the stainless steel heat treatment furnace directly heated by the flame. In order to ensure that the surface of the steel plate is not affected by the ash falling from the top of the furnace, the stains that are difficult to remove affect the quality of the surface. The refractory material with good thermal stability builds the top of the furnace, the heat treatment furnace with periodic operation requires the thermal inertia of the masonry to be small, it is necessary to use a lightweight refractory material with smaller specific heat capacity and good heat insulation. For the furnace with protective gas, the choice of masonry refractory material refers to refractory material for furnace.
