After years of actual production experience, for lead smelting, the metallurgical furnace used includes dozens of metallurgical furnaces for burying various lead materials, but the refractory lining of metallurgical furnaces mainly uses magnesia chrome bricks and high alumina bricks. Aluminium, magnesia-chrome refractory ramming material, etc.
In the design of the furnace lining in the permanent layer area of the furnace bottom, the selection of refractory materials also changes according to the different positions in the furnace body. Take the fixed horizontal metallurgical furnace body as an example. The bottom of the furnace is generally made of magnesia chrome brick, high alumina brick, aluminum chrome spinel and high alumina ramming material, magnesium ramming material, etc. The anti-seepage and ramming material is also composed of AL2O3-SiO2 system, and the content of AL2O3 is >75%. The proportion of liquid lead is 10.6g/cm3, and the permeability is extremely strong. Therefore, the refractory material of the furnace bottom must have the function of dissipating heat, and also has the high ability to prevent lead.
At present, the widely used method is to first lay high aluminum brick on the bottom steel plate. The high aluminum brick has high compressive strength (normal temperature compressive strength 40~60MPa), and the thermal conductivity (2.09+1.861×10-3t) is also high. Magnesia-chrome brick (1.28+0.407×10-3t) is used as a cushion at the bottom of the furnace bottom. A layer of refractory material with anti-lead penetration should be placed on the upper part of the bottom layer of the furnace. Currently, magnesium strontium is used. Feeding or high-strength anti-seepage and ramming (high-aluminum), both of which can function as compartments. The ratio of magnesium ramming material is: magnesia: magnesium powder = 7:3, with brine, magnesia grain size: 0.2~0.5mm70%, 1.5~3.0mm30%; high strength anti-seepage ramming ingredients It is: high-aluminum aggregates of various particle sizes and bone powder. After high temperature baking, the aggregates of various particle sizes are intensively combined to achieve the desired anti-seepage purpose.
It must be noted that after the magnesium and magnesium chrome ramming material is beaten, it needs to be baked at a low temperature. After the free water is baked, the expansion joint is filled with fine magnesium powder to ensure the strength and compactness of the ramming layer. Sex. The thickness of the ramming material is recommended to be 150~300mm, which is convenient for one-time completion of the beating, and can be uniformly baked to form a whole layer with better anti-seepage effect.
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