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Production method of recycled aggregate of engineering waste soil

A production method and engineering spoil technology, which is applied in construction waste recycling, sustainable waste treatment, solid waste management, etc., can solve problems such as difficult mud, difficult site selection, and discharge

Active Publication Date: 2019-05-31
SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a production method of engineering spoil regenerated aggregate. The invention realizes the separation of engineering spoil and silt through dry operation, which solves the problems of large water consumption, large land occupation and site selection caused by the current washing process. Difficult problems, especially by avoiding large volumes of unmanageable slurry discharges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Randomly sampled to measure the water content of the project spoil to 55%;

[0048] Use a mesh screen with a size of 50mm to sieve to obtain large-size lumps and fines;

[0049] Jaw crushing (the particle size of the discharge port is 50mm) is used to crush the large-sized blocks obtained after pre-screening to obtain crushed materials;

[0050] The crushed material is subjected to primary screening by a large-scale vibrating screen to obtain materials with a particle size ≥ 50 mm and materials with a particle size < 50 mm; materials with a particle size ≥ 50 mm are re-crushed to a particle size < 50 mm;

[0051] The fine material and the material with a particle size <50mm are subjected to vacuum negative pressure dehydration (pressure is 15kPa, temperature is 55°C) until the moisture content is <3%, and the dried material is obtained;

[0052] Adopt grinder to grind the dried material (the rotating speed of grinding is 16r / min, the time of grinding is 10min) to obtai...

Embodiment 2

[0056] Randomly sampled to determine that the water content of the project spoil is 36%;

[0057] Use a mesh screen with a size of 100mm to sieve to obtain large-size lumps and fines;

[0058] Jaw crushing (the particle size of the discharge port is 50mm) is used to crush the large-sized blocks obtained after pre-screening to obtain crushed materials;

[0059] The crushed material is subjected to primary screening by a large-scale vibrating screen to obtain materials with a particle size ≥ 50 mm and materials with a particle size < 50 mm; materials with a particle size ≥ 50 mm are re-crushed to a particle size < 50 mm;

[0060] The fine material and the material with a particle size <50mm are subjected to vacuum negative pressure dehydration (the pressure is 15KPa, the temperature is 55°C) until the moisture content is <3%, and the dried material is obtained;

[0061] The dried material is ground by a ball mill (the grinding speed is 15r / min, and the grinding time is 9min) to...

Embodiment 3

[0065] Randomly sample and measure the water content of the project spoil to be 80%;

[0066] Use a mesh screen with a size of 50mm to sieve to obtain large-size lumps and fines;

[0067] Jaw crushing (the particle size of the discharge port is 50mm) is used to crush the large-sized blocks obtained after pre-screening to obtain crushed materials;

[0068] The crushed material is subjected to primary screening by a large-scale vibrating screen to obtain materials with a particle size ≥ 50 mm and materials with a particle size < 50 mm; materials with a particle size ≥ 50 mm are re-crushed to a particle size < 50 mm;

[0069] The fine material and the material with a particle size <50mm are subjected to vacuum negative pressure dehydration (pressure is 15kPa, temperature is 55°C) until the moisture content is <3%, and the dried material is obtained;

[0070] Adopt grinder to grind the dried material (the rotating speed of grinding is 18r / min, and the time of grinding is 12min) t...

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Abstract

The invention relates to the technical field of recycling of engineering waste soil, in particular to a production method of recycled aggregate of engineering waste soil. The method is based on dry operation and zero water consumption, and the water content of the engineering waste soil can meet the demand of process water after the engineering waste soil is separated; large-scale equipment such as a sand washer and a sedimentation tank are not needed, the process flow is based on automated control, the occupied area is small, and the influence on the surrounding environment is small; no slurry is discharged; the efficiency of separating mud is high, the mud content of the separated engineering waste soil is lower than 3%, and muddy powder does not contain aggregate granules, and the comprehensive treatment cost is low.

Description

technical field [0001] The invention relates to the technical field of reuse of engineering spoils, in particular to a production method of recycled aggregates from engineering spoils. Background technique [0002] At present, urbanization has brought about a large amount of engineering spoil discharge, including subway engineering spoils, track engineering spoils, and construction foundation pit spoils. At present, due to the lack of resource disposal technology, large-scale spoils are mainly disposed of in centralized landfills, which not only requires a large amount of land to build landfills, but also brings traffic, energy consumption, air pollution, hydrological damage, safety improvement, etc. social management pressure, and there are obvious safety management problems in concentrated landfills. [0003] In response to the above problems, it has been proved by domestic practice that the use of engineering spoils to produce recycled building materials for urban constr...

Claims

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Application Information

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IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 关宇陈为武杨正松欧小凡
Owner SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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