refractory

The production process of fire clay brick mainly includes seven processes:

The first step: fire clay brick takes soil. The soil used for the burning of the brick is taken from the old soil of two feet deep under the surface. The color of the layer is slightly deeper than that of the surface soil. It is composed of about 80,000 to 120,000 years ago. At that time, the earth's climate warm and humid, rich biological effect of this period of the composition of the soil soft and sticky, is a good brick burning material.

The second step: excavated out of the clay, through up to six months or so in the open-air accumulation process, so that the sun shines, snow frost, so that the internal differentiation of the loose, and then through the craft damage, sieve, leaving only fine pure soil.

The third step: the pure water and moisturizing, and then repeat and refining, or cattle force trampling, making it a thick mud, manpower mud and refining to 5 to 6 times, the process of the final brick quality to critical effect.

The fourth step: turn to fill fire clay brick into the wooden brick in the mold, after compaction, with iron wire bow to scrap the remaining mud, and into a blank. Before the billet, in the wood mold under the ground sprinkle a layer of sand, to prevent mud and ground adhesion.

Step five: demoulding of the brick to be placed back to the sun dry, to prevent the exposure of the brick cracks and deformation.

Step six: After the billet is completely boring (about one to two months), then into the kiln firing, the process is the most important part of the whole brick making process, the usual brick use of coal as fuel, and the density of more High pulp bricks are wheat straw, pine and so gradually slow burning.

Step seven: After ten days of burning, the body has been sintered, such as when the time gradually turn off, the outside air into the kiln, the body after the cooling is flashing red, which is our common red brick, brick It is necessary to rust in the kiln, the way is in the high temperature sintering brick, with clay cover the kiln hole, cut air into the kiln temperature into the recovery atmosphere, so that the body of the red high-grade iron oxide In order to avoid the cheap iron in the body from the beginning to be oxidized, in the soil with the top of the kiln sealed with water, so that the water at high temperature into a vapor, absorb the heat inside the kiln, the kiln body in the This cooling process continues to maintain a recovery atmosphere until the kiln is completely cooled.