Production method for wet processing of machine-made sand by using tunnel hole slag siltstone

Abstract

The invention discloses a production method for wet processing of machine-made sand by using tunnel hole slag siltstone. The production method comprises the steps: a base material with the compressive strength of more than or equal to 80 MPa is selected; the base metal is crushed by a first crusher to obtain broken stones with the particle size being smaller than or equal to 100 cm; the broken stones are crushed by a second crusher to obtain particles, and the obtained particles are subjected to vibration screening to obtain particles with the particle size larger than 31.5 mm, particles with the particle size ranging from 5 mm to 31.5 mm and particles with the particle size smaller than 5 mm; the obtained particles with the particle size larger than 31.5 mm are crushed again through the second crusher, and then the operation is repeated; the obtained particles with the particle size ranging from 5 mm to 31.5 mm are crushed through a third crusher, the crushed particles are subjected to vibration screening, and the particles with the particle size smaller than 5 mm are obtained; and the obtained particles with the particle size of less than 5 mm are washed with water, the water-washed particles are fed into a water washing wheel through a chute, and dehydrating treatment is carried out. The method disclosed by the invention has the beneficial effects that the method disclosed by the invention is beneficial to control of the content of the machine-made sandstone powder, the controllable content of the sandstone powder can be ensured through water washing, and the strength and the working performance of the concrete can be effectively controlled.

Description

technical field [0001] The invention belongs to the field of highway and railway engineering, and in particular relates to a production method for wet processing machine-made sand using tunnel slag siltstone. Background technique [0002] With the continuous development of my country's engineering industry, the demand for river sand for railway construction continues to grow. At present, the national environmental protection pressure is relatively high. Sand mining is strictly prohibited in most areas of the river. The quality of machine-made sand processing has a huge impact on the safety and stability of railway tunnels and bridge concrete. At present, most of the actual machine-made sand processing adopts dry processing, and various problems in dry processing also exist, such as the control of stone powder content, which has a great impact on the strength and workability of concrete. Due to the high water content of dry processing raw materials, The high soil content of the...

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Problems solved by technology

[0002] With the continuous development of my country's engineering industry, the demand for river sand for railway construction continues to grow. At present, the national environmental protection pressure is relatively high. Sand mining is strictly prohibited in most areas of the river. The quality of machine-made sand processing has a huge impact on the safety and stability of railway tunnels and bridge concrete. At present, most of the actual machine-made sand processing adopts dry processing, and various problems in dry processing also exist, such as the control of stone powder content, which has a great impact on the strength and workability of concrete. Due to the high water content of dry processing raw materials, The high soil content of the raw material will make it difficult to screen the fine aggregate, and the soil content or fine powder content will exceed the relevant standard requirements; in addition, dust will be raised at each processing point in the dry processing, and the operating cost of the dust removal system is high; the use of siltstone for wet processing The quality of processed machine-made sand for concrete application is worth exploring