Method for preparing gangue slag machine-made sand

Abstract

The invention discloses a method for preparing gangue slag machine-made sand. The method comprises: weighing raw materials for next use, adding all raw materials without a water reducing agent into asand making machine, crushing, grinding and shaping the gangue slag through the sand making machine containing a grinding medium, and controlling the ground gangue slag particle shapes and fineness through adjusting a feeding amount of a feeder, the sizes, amount and quality of the grinding medium and the load of the grinding medium to obtain a crushed mixture. The gangue slag machine-made sand can guarantee the shape and fineness of gangue slag and improve the physical properties of the machine-made sand raw materials from the source. A screening powder removal system realizes gradation of the machine-made sand raw materials so that the gangue slag machine-made sand has good gradation effects and good particle shapes.

Description

technical field [0001] The invention relates to the technical field of sand making, in particular to a method for preparing gangue slag machine-made sand. Background technique [0002] With the development of my country's basic construction, coupled with the prohibition and restriction of mining of natural river sand resources, the supply of natural river sand is becoming increasingly tight, making the production and application of machine-made sand develop rapidly. However, at present, the production of machine-made sand mainly uses ore raw materials. On the one hand, it needs to dig mountains to extract rocks, which destroys the ecological environment. On the other hand, it needs to be washed to remove mud and powder, which consumes limited water resources and causes environmental pollution. Gangue slag is the waste slag discharged after the power plant adopts circulating fluidized bed boiler technology to generate electricity. With the popularization and application of do...

AI Technical Summary

Problems solved by technology

However, gangue slag has the problems of flat particle shape, high crushing value and water absorption, and poor gradation. It cannot be directly used as machine-made sand. It needs to improve its gradation and particle shape, and reduce its crushing value and water absorption. rate, but the existing sand making process is difficult to realize

[0003] At the same time, in the process of sand making, large particles or massive raw materials are thrown out under the high-speed operation of the rotor in the crusher, and the thrown out raw materials collide violently with the inner wall of the crushing cavity or the raw materials on the inner wall during the high-speed movement. , this kind of fierce collision will generate a lot of dust, and the machine-made sand produced by the above process usually contains more than 20% of dust, thereby reducing the yield of machine-made sand and affecting the quality of machine-made sand. Excessive dust will also seriously polluted environment