In the non-ferrous metal smelting industry, magnesia brick plays a very key role, with many important uses.
Magnesia brick
1. Resisting high temperature erosion
Non-ferrous metal smelting usually needs to be carried out in a high temperature environment, such as copper, aluminum and other metals melting process temperature often exceeds 1000℃. Magnesia brick has excellent high temperature resistance and can withstand such high temperatures without softening and deformation, providing a reliable lining protection for smelting furnaces. In the reflection furnace or flash furnace of copper smelting, magnesia brick can face high temperature copper melt and slag for a long time, effectively prevent the direct damage of high temperature to the furnace structure, ensure that the smelting process continues in a stable high temperature environment, prevent the furnace body damage and production interruption caused by the furnace lining material is not resistant to high temperature, and effectively guarantee the continuity and stability of non-ferrous metal smelting production.
2. Chemical corrosion resistance
Non-ferrous metal smelting process will produce a variety of complex chemical substances and slag, these substances often have strong corrosive. Magnesia brick has good resistance to chemical corrosion of flux, slag and metal steam in the smelting process of many non-ferrous metals. Taking aluminum smelting as an example, the electrolytes in the electrolyzer contain a variety of fluoride and other highly corrosive components, and the magnesia brick can remain relatively stable in such a harsh chemical environment, reducing the rate of erosion due to chemical reactions, thereby extending the service life of the smelting furnace lining. This not only reduces the cost of frequent replacement of lining materials, but also reduces the impurities mixed into metal products due to lining corrosion, and improves the purity and quality of non-ferrous metal products.
3. Maintaining thermal stability
In the different stages of non-ferrous metal smelting, the temperature in the furnace fluctuates greatly. The thermal conductivity of magnesia brick is relatively moderate, which can effectively store heat in the high temperature stage, reduce heat loss, and buffer the stress caused by thermal expansion and cold contraction when the temperature fluctuates. In the blast furnace of lead and zinc smelting, the temperature in the furnace is constantly changing with the alternating process of feeding, melting, slagging, etc., and the magnesia brick can better adapt to this thermal change, maintain its own structure integrity, and avoid cracking and spalling caused by thermal stress. Its stable thermal performance helps to maintain the relative uniformity of the temperature field inside the entire smelting furnace, creating favorable conditions for the efficient melting and refining of non-ferrous metals, which is conducive to improving the metal recovery rate and reducing energy consumption, and promoting the energy saving and sustainable development of the non-ferrous metal smelting industry.
