Drying-method sand making device and process

Abstract

A drying-method sand making device and a process relate to the field of sand making technology. The device includes: a jaw crusher, an impact crusher, a first grading screen, a drying-method sand making machine, a second grading screen and a concentrated dust collecting system. The production process comprises the steps: a stone material in a stone material bin is evenly fed into the jaw crusher through a feeder for a first rough crushing, the crushed material is transported to the impact crusher for a second fine crushing, the crushed material goes into the first grading screen for grading, sandstones with the size of less than 40 mm are fed to the drying-method sand making machine through a conveyor for crushing and sand making, and broken stones with the size of more than 40 mm are returned to the impact crusher; the sandstones going into the drying-method sand making machine are transported to the second grading screen for grading after being crushed by the drying-method sand making machine, sand with the size of less than 3 mm is directly fed into a finished product sand bin, and a stone material with the size of more than 3 mm is afresh returned to the drying-method sand making machine for crushing. The produced machine-made sand has good particle shape and high finished product rate, and can meet the technical index of high-performance concrete on the machine-made sand.

Description

technical field [0001] The invention relates to the technical field of sand making, in particular to a dry sand making equipment and process. Background technique [0002] At present, in the production process of machine-made sand, the main equipment is jaw crusher, centrifugal impact sand making machine and vibrating screening machine. The coarsely broken materials are sent to the sand making machine by the belt conveyor for further crushing, the finely crushed materials are sent to the vibrating screen for screening, and the materials that meet the particle size requirements of the finished product are sent to the sand washing machine for cleaning. The output of the finished product conveyor belt is the finished product; the material that does not meet the particle size requirements of the finished product is returned from the vibrating screen to the sand making machine for reprocessing, forming a closed circuit for multiple cycles. [0003] The mechanical sand produced b...

AI Technical Summary

Problems solved by technology

[0003] The mechanical sand produced by the above production process is not good in shape, has too many needles and flakes, the gradation is not completely reasonable, and the fineness modulus is too large. In addition, the stone powder in the wet sand making process is completely washed away.

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