The low cement castable is prepared from refractory aggregate, high alumina fine powder and binder in a certain proportion, pre-formed and baked to become a refractory material with good performance. Very suitable for the conditions of use of the furnace.
The original heating furnace uses a large number of ordinary clay bricks to be built. In some parts, the clay bricks need to be processed, resulting in poor overall masonry and reduced strength of the masonry. Especially in the gap between the trolley and the side wall, debris such as broken bricks are dropped, and the phenomenon of scraping the side wall when the trolley enters and exits sometimes occurs, and the damage to the furnace wall is very serious. In addition, when the masonry in the lower part of the arch of the top of the furnace is used for a long time, it is inclined inward to create a gap, and the flame directly burns the arch of the arch, which is harmful to the furnace body and is often repaired. The service life of the kiln is about one year, which increases the maintenance cost and also affects the normal production of the hydraulic press.
The lining of the trolley type heating furnace adopts the anchor brick structure, and the top of the furnace is in the form of a flat top suspension. The tire mold is made on the spot according to the size of the furnace, and the refractory material of the furnace body is baked and put into use. Low cement castable not only overcomes the low temperature strength of ordinary castables, but also compensates for the defects of poor temperature strength of ordinary castables. It uses ultrafine powder and high-efficiency admixture to reduce the amount of cement and water and improve the pore structure. Quality and strength; the material has anti-penetration, erosion resistance, wear resistance, good mechanical properties, and has a wide range of applications.
Through the observation of the use of low-cement castables in the furnace for nearly 4 years, the overall performance of the furnace body is very good, the surface does not fall off, the refractory material of the furnace body is basically not damaged, the surface temperature of the kiln shell is about 70, forging gas bill The consumption has also dropped from 5 300 m3/t to 3 500 m3/t, which has achieved good economic results. Low cement castables are used in furnace kiln engineering, which not only reduces the amount of bricks used, improves the labor intensity of construction, shortens the construction period, but also has good integrity of castable lining, excellent thermal insulation performance, and greatly reduces energy consumption. The effect of energy saving and emission reduction. Compared with clay bricks, the price of castables is three times that of ordinary linings, but the service life of kiln is increased by five times, and the economic benefits are obvious. In addition, castables require only a small number of furnace builders during construction, which can save a lot of labor costs.
With the continuous development of refractory technology, foreign companies have built kiln by means of prefabricated block splicing. Many domestic enterprises have adopted this method. The advantage is that refractory precast blocks are produced and baked in refractory plants. Direct installation on site reduces the construction cycle and eliminates the need for ovens. The use of special hanging furnace beams, the top hanging parts are all canceled, only one item will save the cost of building the furnace kiln 1/5. When a brick is burned in the process of use, it can be replaced in a short time, greatly improving The efficiency of the kiln is very obvious.