The production process of refractory bricks mainly includes the following steps:

I. Preparation of raw materials

Selection of raw materials: The main raw materials of refractory bricks include kaolin, quartz sand, bauxite and clay. These raw materials need to undergo strict quality inspection to ensure that their chemical composition and physical properties meet the requirements.

Raw material treatment: raw materials are crushed, crushed and screened to ensure the uniform particle size of raw materials and meet the process requirements. Some raw materials need to be treated with secondary finishing such as pickling and iron absorption to remove impurities.

II. Batching and mixing

Ingredients: according to the performance requirements of refractory bricks, different raw materials are mixed in a certain proportion. The accuracy of ingredients directly affects the quality of products.

Mixing: Add the prepared raw materials into the mixer, and mix thoroughly to make the raw materials evenly mixed. In the process of mixing, a proper amount of binder and water should be added. After mixing, the mud needs to stand for a period of time (trapped material) to make the raw materials fully react and homogenize.

III. Molding

Molding method: Common molding methods include press molding and extrusion molding. Press molding is to put the mixed mud into a mold and press it by a brick press; Extrusion molding is the extrusion molding of mud through an extruder.

Molding requirements: the molded brick should reach a certain density and strength, and the appearance size should meet the design requirements.

IV. Drying

Natural drying: the molded brick should be naturally dried in a well-ventilated place for 2-3 days.

Drying in the kiln: put the green bricks into the kiln, dry them at low temperature (25-30℃) for 3-5 days, and then forcibly dry them at high temperature (50-65℃) for 7-15 days. During the drying process, the temperature and time should be controlled to prevent the brick from cracking.

V. Firing

Kiln loading: smoothly load the dried bricks into the kiln car to ensure the neat loading.

Sintering process: the purpose of sintering is to sinter the brick blank and form a dense structure. The firing temperature and time should be strictly in accordance with the firing curve formulated by the technical department. During the firing process, it is necessary to record the heating data to ensure the firing quality.

VI. Inspection of finished products

Appearance and size inspection: conduct a full inspection of the appearance and size, physical and chemical indexes, melting holes, spalling and other items of the fired refractory bricks.

Quality control: The qualified finished products shall be neatly stacked in the shade and marked.

VII. Packaging and Shipping

Packaging: Qualified refractory bricks should be packaged, and the packaging should meet the requirements of transportation and storage.

Shipment: according to the requirements of the contract, the products are shipped in time, and the relevant physical and chemical index test reports and certificates are provided.

The whole refractory brick production process needs to strictly control every link to ensure the quality and performance of the final product.