The kiln body of zinc volatilization kiln is large. If the lining is not properly selected, it is easy to cause deformation of the cylinder, which will affect the normal operation of the entire kiln. Reasonable brick design is crucial. It can effectively disperse stress and reduce damage caused by excessive local force. At the same time, the selection of refractory brick material is even more critical. Since there are many brick joints in the kiln lining, it is easy to be eroded by slag. Therefore, dry masonry is used as much as possible during construction to reduce the sensitivity of brick joints to slag erosion. In addition, the kiln lining must also withstand the dual effects of mechanical scouring and reducing atmosphere, which accelerates the erosion rate of the lining refractory material. Therefore, when selecting refractories bricks for the lining of zinc volatilization kiln, it is necessary to be very cautious and consider a variety of factors comprehensively to ensure that the lining bricks can operate stably under harsh working conditions, extend service life, reduce maintenance costs, and ensure efficient production of zinc volatilization kiln.
Key considerations for refractory brick selection:
1. Kiln body stability
- The zinc volatilization kiln is large in size. If the kiln lining is not properly selected, it may cause the kiln body to deform and affect the normal operation of the entire kiln. Reasonable brick design is essential for effectively dispersing stress and minimizing damage caused by excessive local stress.
2. Minimize slag erosion
- The kiln lining has many brick joints and is particularly susceptible to slag erosion. To alleviate this situation, dry masonry construction is recommended to reduce the sensitivity of brick joints to slag erosion.
3. Mechanical scouring and reducing atmosphere
- The kiln lining must withstand mechanical scouring and erosion by reducing atmosphere, which will accelerate the erosion rate of refractory materials. Therefore, it is crucial to select materials with excellent corrosion resistance and wear resistance.
4. Material erosion rate
- Among common refractory bricks, clay bricks have the fastest erosion rate. In contrast, magnesia bricks, magnesia-alumina bricks, chrome slag bricks, and magnesia-chrome bricks have slower erosion rates and are more suitable for use as zinc volatilization kiln linings.
With the continuous development of refractory technology, manufacturers of phosphate bricks have successfully developed special phosphate bricks. The volume density of this special phosphate brick is above 2.9, and its use effect is quite outstanding. At the same time, the application of magnesia-aluminum-chrome bricks in zinc volatilization kilns has also achieved good results. From the perspective of these two types of firebricks, special phosphate bricks are chemically bonded bricks, while magnesia-aluminum-chrome bricks are magnesia bricks. In terms of performance, they each have their own advantages. However, in terms of price, special phosphate bricks have obvious advantages over magnesia-aluminum-chrome bricks, and the price is nearly 2,000 yuan lower. Therefore, from the perspective of economic cost, the use of special phosphate bricks is more advantageous.
If magnesia-aluminum-chrome bricks are used as lining bricks for zinc volatilization kilns, they have a long service life and low replacement frequency, which can effectively reduce maintenance workload and costs. However, if we start from the price factor, special phosphate bricks are also a very good choice for high-temperature zone linings because of their low cost. At present, in the market, there are more users who choose special phosphate bricks, which is mainly due to their good cost performance.
For the preheating zone and cooling zone bricks of zinc volatilization kilns, high-aluminum bricks or ordinary phosphate bricks can be used. In recent years, the use of high alumina refractory bricks and ordinary phosphate bricks in the market shows that users who choose ordinary phosphate bricks account for a high proportion. If special phosphate bricks are used in the high-temperature zone, then phosphate bricks should also be used in the preheating zone and cooling zone. Not only are the materials consistent and can maintain the uniformity of the kiln lining atmosphere, but the wear resistance of phosphate bricks is better than that of high-alumina bricks, and the service life is relatively long. It can better meet the use requirements of different parts of the zinc volatilization kiln, ensure the stable operation of the entire kiln, and provide reliable refractory support for the zinc volatilization process.
