Machine-made gravel processing technology

A processing technology, sand and gravel technology, applied in the field of machine-made sand and gravel processing technology, can solve problems such as high-pressure water washing or high-pressure air separation effect is not ideal, particle shape optimization is not accurate, etc.

Active Publication Date: 2019-02-01
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them: particle shape optimization is not accurately targeted at needle flake particles; gradation optimization is mainly carried out through crushers, and the general process method for gradation optimization of coarse aggregates of different lithologies is still blank; the process of removing mud, mud powder and stone powder Mainly by means of high-pressure water washing or high-pressure air separation, the effect of high-pressure water washing or high-pressure air separation is not ideal for the mud powder solidified on the surface of the stone in actual production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Application case of a stone mine in Zhenjiang, Jiangsu

[0057] The mine mainly produces high-quality machine-made sand and gravel, which are mainly used for expressway road fabrics and special concrete materials. According to this process, the mine process flow is as follows Image 6 shown. Among them, the screening process is firstly screened into 0-3mm, 3-5mm, 5-10mm, 10--16mm, 16- 25mm and other specifications, 3-5mm, 5-10mm, 10--16mm, 16-25mm are screened through 2*16mm, 3*25, 5*40mm, 8*60mm bar sieves respectively. The needle flake stones screened by the bar screen enter the vertical shaft impact crusher for shaping and crushing, and return to the screening system to realize a closed loop. The needle flake of the product is less than 1%; the installed power of the screening and shaping process is nearly 35% lower than that of the ordinary screening and shaping process.

Embodiment 2

[0059] Application case of a mine in Huzhou, Zhejiang

[0060] The enterprise uses ordinary stone to process high-quality stone. When ordinary stone is processed, it is first moistened with water at a ratio of 8-12%, and then transported to the raw material pile in the high-quality workshop for storage for about 24 hours. The content of high-quality machine-made sand and gravel mud powder is less than 1‰ (< standard 5‰), and the comprehensive water consumption per ton of finished products is 0.52 cubic meters. The products are widely used in high-speed railways, pipe piles, high-rise buildings, etc.

Embodiment 3

[0062] Application case of a mine in Lanzhou, Gansu

[0063] (1) 5-10mm stone gradation optimization

[0064] The company used a two-layer sieve for 5-10mm screening in the early stage. The mesh parameters of the screen are 10*10mm and 5*5mm. Due to the low screening rate of 5mm, the gradation of 5-10mm has not been up to standard. Based on this process, through transformation, a layer of 6.5mm screen is added between the above two layers of screens, and the 5mm screening efficiency is increased by 25%. At the same time, at the discharge end of the vibrating screen, a hydraulic push rod is added to push the baffle plate to divide the material, and part of the 5-6.5mm stone is removed, and the 5-10mm stone gradation is better optimized, such as Figure 7 shown.

[0065] (2) Optimization of sand making system

[0066] Before the improvement of the sand making system of this enterprise, the raw materials are mainly 5-10mm stone, mixed with no less than 20% of 0-5mm original co...

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Abstract

The invention discloses a machine-made gravel processing technology. The processing technology comprises the steps of firstly crushing stone generally; adding a screening procedure through a strip-type screen in the screening step, screening out elongated and flaky particles from semi-finished products, and achieving precise crushing and squaring of the elongated and flaky particles; performing special composition regulation based on the standard composition requirement after screening of machine-made gravels; and pre-wetting gravels after composition optimization and stacking for at least 24hours, and then washing the gravels with water for removing mud and fines. According to the machine-made gravel processing technology, the effects of precise crushing and squaring of the elongated andflaky particles, precise composition regulation of the gravels, mud and fines removal through combination of pre-wetting and water washing are achieved; the problems of composition, grain shape, mudcontent, water absorption and other quality indexes of the machine-made gravels are solved systematically and economically; and a production technology with certain universality is provided for high-quality machine-made gravels.

Description

technical field [0001] The invention relates to the technical fields of needle-like granule screening, gradation adjustment and desilting and depowdering of machine-made sand, in particular to a processing technology of machine-made sand. Background technique [0002] Sand and gravel are the most exploited resources in my country. With the gradual depletion of natural sand and gravel resources, machine-made sand and gravel will become the main source of construction aggregate. Ordinary machine-made sandstone processing is mainly composed of coarse crushing, pre-screening, fine crushing, and finished screen. High-quality machine-made sandstone generally requires additional shaping processes. like Figure 5 shown. [0003] Quality indicators such as sand and gravel gradation, grain shape, mud block content, and mud content directly affect the work performance, mechanical properties, durability and cost of concrete. On the premise that the raw materials are qualified, in add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C23/12B07B1/28
CPCB02C23/12B07B1/28
Inventor 邵建峰
Owner NANJING TECH UNIV
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