Refractory material for Reflector Furnace

Nov 08,2017
Reflector furnace is China's main ice melting furnace. Use coal or heavy oil for fuel, the highest temperature up to 1750-1800 ℃. High furnace temperature, material melting fast, good product quality, low cost. However, refractory brick consumption, high material requirements, demanding furnaces. Rectangular reflector furnace, large copper reflector furnace length * width * height = (25-60) * (a 14) * (2.4-3.8) m. Large furnace space to heat radiation-based, the highest temperature in the furnace area concentrated in the roof. The refractory materials used should be high temperature, good thermal shock resistance, bulk density, small changes in the firing line and good slag resistance.

(1)furnace roof.

Small and medium-sized reflector furnace span, the roof is generally vault structure. In the past with silica brick masonry, now using high-alumina refractory brick masonry. As the furnace temperature is high, the tendency to switch to the roof of magnesia hanging material. In the large-scale reflector furnace roof span, are hung Gui structure. Furnace temperature is high, high dust gas furnace, SO2 concentration, flow rate (10m / s or so), furnace gas erosion on the top of Shanghai is very serious. Resulting in serious erosion, erosion and melting loss of the top of the furnace; as a result of operations such as feeding, slag discharge and ice-melting, the temperature fluctuates and causes cracking, exfoliation and slag splash erosion of the refractory. Therefore, the use of high-alumina refractory bricks, magnesia-chrome bricks and the like for the roof material.

(2) furnace wall.

Copper furnace reflector wall is divided into side walls and end walls. The above parts of the slag line are mainly subjected to the heat load of high temperature and the erosion of high-temperature dust-containing SO2 gas stream and the chemical attack of slag and matte splatter. The following parts of the slag line and the slag line are mainly subjected to chemical attack of slag and matte. The most damaged and the most damaged area is the area of the slag line. Therefore, the general use of magnesia brick or chrome brick, magnesia chrome brick masonry lining. Contact with the melt site, the main brick lining also hung a layer of slag on the surface, play a protective effect, to extend the service life. Slag area to take thicker furnace wall to extend life expectancy, or the direct combination of magnesia-chrome brick lining, or wall wall installation of water-cooled jacket, lined with high quality alkaline brick and scum protection. Non-working layer is generally clay bricks plus light refractory bricks.

(3) bottom of the furnace.

The mat of copper matte furnace is mainly affected by the chemical attack and thermal stress of molten matte and molten slag. Occasionally firebrick brick joints are too large, masonry is not good, matte infiltration into the furnace floor, will cause the bottom of the brick floating damage. The general use of multi-layer structure of composite furnace bottom: in turn in the steel shell surface filled with refractory fiber mat, light refractory brick, magnesium brick, working lining general use of sintered sand sintering furnace or quartz sand sintering bottom (less) , And anti-arched structure. Copper reflector furnace is generally equipped with electric bed (electric heating insulation), are generally used magnesia brick or magnesia-chrome brick masonry.