1. Determination of the molding method. There are three methods for producing light mullite bricks at home and abroad: foam method, additive sintering method and gasification method. 2. Raw material requirements. a. Styrofoam beads: white in appearance, granular, uniform in size, and within 0,5-2ram in diameter.
Forming method and raw material requirements of light mullite brick
B. Sawdust scraps: Fine scraps are used for sieving through 2nun sieving screens. If the amount is too large, the performance of the mud will be reduced, and the molding will be difficult. After the molding is dry, it will easily swell, and the bricks will easily deform during firing. low.
Forming method and raw material requirements of light mullite brick
Formulas 3, 4 and 5 use foamed polystyrene beads as embers. The foamed polystyrene beads do not absorb water, have small drying shrinkage, and cannot help transfer water. The surface of the brick blank is dried during the drying process, and the interior Water cannot run out in time, and the surface is prone to microcracks. After the green body is fired, the foamed polystyrene beads form large pores, but the surroundings are heavy and dense materials, and the structure is not well organized (see picture). The d foamed polystyrene beads are embers, and the b compound is used as embers. Formula 6, Formula 7, Formula 8, and Formula 9 use composite additives as embers.
Forming method and raw material requirements of light mullite brick
Hog sawdust can absorb water, help transfer water, and easily burn embers. It can prevent cracking of the brick blank, and can fill the gap between beads and reduce the density. The foam polystyrene beads have small drying shrinkage, low water content of the green body after molding, small drying deformation of the product, and accurate size of the finished product.
