The invention discloses a method for preparing porcelain granules by using
fly ash, which comprises the following steps: putting
fly ash,
potassium feldspar and
quartz as raw materials into a
ball mill respectively, dry-milling the raw materials, sieving the milled raw materials respectively, removing iron from the sieved
fly ash, putting the fly ash after
iron removal, the sieved
potassium feldspar and
quartz and kaolin into the
ball mill, and wet-milling and evenly mixing the materials to form mixed
slurry; and granulating the mixed
slurry by adopting a pressure type spray granulator, putting the granules into an
alumina crucible, placing the
alumina crucible into a
silicon-carbon rod resistance furnace,
sintering and naturally cooling the granules, and taking out the granules to obtain the high-strength porcelain granules. The method for preparing the porcelain granules by using the fly ash is not only favorable for saving natural resources and reducing the production cost, but also favorable for
environmental protection. The fly ash does not need to be crushed by a high-power
crusher, and the fly ash is mixed evenly. The production process is easy to control, and has little
energy consumption; the strength of the prepared fly ash porcelain granules can reach 60 to 120MPa; and the porcelain granules have good properties of light weight, high
temperature resistance,
corrosion resistance and the like, and can be used as a fracturing propping agent for middle and deep layer oil-gas fields.