1, the Pan-cream 

Birth brick surface layer of white powder, which is brick residual magnesium, soluble salts such as sodium, the exudate absorbing surface after evaporation residue. Since the body contains a certain amount of crystal water and dehydrated expansion, therefore, will crack when hoarfrost brick surface. To this end, the control transferral of clay content of magnesium compound is less than 3%. Strengthen crushed improve fineness and appropriate to extend the roasting and holding time, the resulting water-insoluble silicate, reduce or eliminate hazards. 

2, mute brick 

Apart from the fire caused due to external brick mute, invisible cracks caused by the molding material and stealth layered soil due to too many impurities, leaving uneven mixing, wet billet preheat temperature in a hurry, has been frost blank blank brick and tile in the preheating zone to absorb moisture condensation will form micro-cracks etc., resulting in muted brick, body suddenly cold forming microcracks, etc., may also cause mute brick. In this regard, in addition to strengthening material handling, remove impurities, and mix well, to improve the parameters of brick tile machine, we must also be careful not to burn high-temperature slab, billet frost, and should ensure a good warm-up, long enough insulation tape . 

2, burst 

When the residual moisture is too high blank brick kiln, with a heating rate of the initial warm-up is over 25-35 ℃ / h, the body rapidly vaporized steam time to discharge, extrusion blow brick blanks, higher residual moisture , the situation is more serious, even the crown burst sound can be heard, especially after the fire just entering the preheating zone squatting more acute warming, casualties of water is not too high, the water vapor is often only racking blank brick surface, forming a cobweb-like fine cracks, which, in addition to the blank into the kiln should be controlled below 8% residual moisture, it should also be extended warm-up band, so slowly warming uniform dehydration, as well as fire and the wheel after squatting kiln burning paper block away slowly lift gates, slowly heightening. 

3, charred brick surface blistering 

Blistering. The reason is heating up too quickly with roasting, sintering surface melting rapidly, blocking the gas chemical reaction inside the pores is still going nowhere arising in brick drums into the air and therefore the heating rate should be lower than 40 with roasting -70 ℃ / h, especially in the body has reached a temperature above 900 ℃, continue to heat up speed is even lower than 20 ℃ -30 ℃ / h, to avoid foaming burnt brick surface. 

4, hairline 

Appeared thin and pale brick face virtually no poor approximation of the crack line, and sometimes also extends to crack the top surface of the face or. This is mostly hidden left molding, firing and improper use gates, cracks expand. To this end, should be appropriately reduced plasticity index of raw materials, brick machine spiral reamer adjust speed and helix angle, using separate spiral reamer and playing on clay cylinder plus mud mud stick to mitigate stratification; or using hot water steam mixing, vacuum squeezing mud, mud and other measures to reduce feed water to eliminate air stratification; another roasting gates should be properly used, uniform rows and sub-sub-tidal front gates and other implementation.