Fire Clay Brick

Fire clay brick raw material preparation is mainly the preparation of clinker and the preparation of combined clay. The preparation of clinker is to transfer the refractory clay raw material through high temperature to make clinker, and then Crush, sieve and pulverize into various grades of granules and fine powders. The equipment for making combined clay is to crush the clay, dry it, and then finely grind it into powder and mix it. This completes the preparation of the ingredients.

The clay clinker is coarsely crushed into lumps less than 50mm in size, and then crushed into aggregates of 5~2mm in various levels, and the sieved material enters the mill to be ground into fine powder less than 0.5mm in size. The bonded clay is generally dried, then coarsely crushed, crushed, and finely ground to a fine powder less than 0.5 mm, or mixed with clinker to make a fine powder.The mixture is kneaded into a trapped material and then kneaded to shape.

The mixed clay material is sent into the molding machine, and the common molding methods include extrusion molding and vacuum suction molding. Under the action of the molding machine, the clay material is extruded or absorbed into the mold to form the shape of the adobe. The shaped adobe has a certain humidity and needs to be processed and adjusted to ensure its quality and stability. This completes the preliminary shaping work of fire clay bricks.

The formed fire clay bricks need to be dried to remove moisture. Usually natural drying or heating drying is adopted. Natural drying needs to place the adobe in a well-ventilated place and let it dry naturally for a period of time. Heat drying is to put the adobe into an oven or a drying room and provide a heat source for heating to speed up the evaporation and drying process of water. This completes the drying process of the refractory clay bricks.

The dried bricks are put into the kiln for sintering, so that they have certain dimensions, porosity and compactness, high mechanical strength, good volume stability, and good fire resistance. The sintering process properly controls the rate of temperature rise and fall to maintain the oxidizing atmosphere to avoid cracking and scrap generation. The Kerui factory has two 168-meter-long tunnel kilns, which can ensure the quality of refractory clay and improve production efficiency.

The cooled refractory clay bricks will first be classified according to customer requirements, and then undergo quality inspection by Kerui’s professional quality inspection department. After passing the inspection, they will be customized and packaged according to customer needs, and finally meet factory standards. During this process, customers can follow up in real time, and we will also send specific progress information of the production process to customers in real time.

Fire clat brick can be widely used in iron ladles (such as clay bricks, universal arc bricks), taphole heat (such as sleeve bricks), hot blast furnace regenerators (such as clay checker bricks), and kiln flues (sometimes customers also call them Acid-resistant bricks), etc.

Clay bricks are widely used in kilns in the building materials industry, such as kaolin tunnel kilns, ceramsite rotary kilns and other dense kilns that do not require high firing temperatures, especially lime shafts, which are generally used in non-critical parts.

In the glass industry, for the lower grate and lower checker bricks of the glass melting furnace regenerator, if the temperature requirements are not too high, fire clay bricks can be used, which are generally professionally called BN-40a and BN-40b.

In coke ovens, generally, fire clay bricks are often used in parts of coke ovens where the temperature is low and fluctuates greatly, such as furnace doors, riser lining bricks, small flue lining bricks, furnace tops, regenerator sealing walls, and checker bricks.

Carbon roasting furnaces and graphitization furnaces do not have very high temperature requirements, but require low creep and density. Most of the entire set of materials are clay bricks, but most of them are low-creep clay bricks or dense clay bricks, such as ZN -45 etc.

Clay bricks for blast furnaces are made of refractory clay and are used to build blast furnace linings. Mainly used in the throat, furnace body, hearth, furnace bottom of small blast furnaces and large blast furnace bodies. In Chinese metallurgical standards, it is divided into ZGN-42 and GN-42.