The first step: the first brick of clay soil. Brick with soil from soil surface under two feet deep, the soil color slightly deeper than the surface soil, it formed about eighty thousand to one hundred and twenty thousand years ago. At that time, the earth's climate is warm and moist, rich biological effect of the period of the formation of soil soft and sticky, is a good material for baking bricks.
The second step: out of clay, after about half the piled up in the open process, let the sun shine, rain and snow and freeze erosion, the decomposition of loose, after manual crushing, sieving, leaving only the pure soil fine.
The third step: the pure soil water moisture, and then repeatedly and refined, or make cattle stampede, make its become thick mud, mud and refining human over roughly 5 to 6 times, the quality of the brick process plays an important role in the.
The fourth step: the clay brick over clay to fill in the blank in the wood, compacted, with wire bow and scrape off the excess sludge, and the blank shape. Blank before, in the form of underground sprinkling a layer of fine sand, mud and the ground to prevent adhesion.
The fifth step: after stripping the brick to be placed away dry, to prevent exposure to bad brick crack and deformation.
The sixth step: to be completely dry (Adobe After about one to two months), then firing into the kiln, the process is the most important step in the process of making brick, brick general use coal as fuel, and the pulp filter brick density higher by wheat straw, pine, slowly burning.
The seventh step: firing after ten days, the green bodies have been sintered, such as then slowly flameout, outside air into the kiln, cooling the body after it appears red, this is our common red brick, the brick will rust conversion in the kiln, method is in high temperature sintering brick kiln roof, used up soil the vent hole, decreased air entry, make the kiln temperature into a reducing atmosphere, so, red high 阶铁 oxide blank is reduced to a low iron oxide green gray, in order to prevent the low iron billet in vivo was re oxidation, in soil sealed kiln top iron water, make water when the temperature becomes a vapour, absorption the heat in the kiln, kiln body in the process of cooling and continued to maintain a reducing atmosphere, until completely cooled from the kiln. From the Loess into brick is complete.
