Method for preparation of regenerated fine powder from concrete mixing station waste residue, prepared regenerated fine powder and use thereof

A technology of regenerated fine powder and concrete, which is applied in the field of regenerated fine powder prepared from waste slag in concrete mixing stations, and can solve problems such as land occupation, environmental pollution, and conflicts, and achieve the goals of reducing energy consumption and short grinding time Effect

Active Publication Date: 2016-03-02
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method of waste slag not only occupies a large area of ​​land, but also causes environmental pollution, which is contrary to the strate

Method used

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  • Method for preparation of regenerated fine powder from concrete mixing station waste residue, prepared regenerated fine powder and use thereof
  • Method for preparation of regenerated fine powder from concrete mixing station waste residue, prepared regenerated fine powder and use thereof
  • Method for preparation of regenerated fine powder from concrete mixing station waste residue, prepared regenerated fine powder and use thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1, regenerated fine powder and preparation method thereof

[0035] The method for preparing regenerated fine powder from waste slag of concrete mixing plant of the present invention comprises the following steps:

[0036] S1. Crush concrete waste slag with a hammer-type fine crusher, sort out slag powder with a particle size ≤ 2.5mm with a linear sieving machine, and dry it naturally until the moisture content reaches 3-5%;

[0037] S2, use ball mill to grind the slag powder in step S1 for 20min to obtain regenerated fine powder, the size of grinding body is respectively and Its gradation is 1.85%, 6.57%, 7.60%, 8.00% and 75.98%.

Embodiment 2

[0038] Embodiment 2, regenerated fine powder and preparation method thereof

[0039] The method for preparing regenerated fine powder from waste slag of concrete mixing plant of the present invention comprises the following steps:

[0040] S1. Crush concrete waste slag with a hammer-type fine crusher, sort out slag powder with a particle size ≤ 2.0mm with a linear sieving machine, and dry naturally until the moisture content reaches 3-5%;

[0041] S2, use ball mill to grind the slag powder in step S1 for 15min to obtain regenerated fine powder, and the size of grinding body is respectively and Its gradation is 1.85%, 6.57%, 7.60%, 8.00% and 75.98%.

Embodiment 3

[0042] Embodiment 3, regenerated fine powder and preparation method thereof

[0043] The method for preparing regenerated fine powder from waste slag of concrete mixing plant of the present invention comprises the following steps:

[0044] S1. Crush concrete waste slag with a hammer-type fine crusher, sort out slag powder with a particle size of ≤1.0mm with a linear sieving machine, and dry naturally until the moisture content reaches 3-5%;

[0045] S2, use ball mill to grind the slag powder in step S1 for 10min to obtain regenerated fine powder, the size of grinding body is respectively and Its gradation is 1.85%, 6.57%, 7.60%, 8.00% and 75.98%.

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Abstract

The invention discloses a method for preparation of regenerated fine powder from concrete mixing station waste residue, prepared regenerated fine powder and use thereof. The method for preparation of regenerated fine powder comprises the steps of: S1. breaking concrete waste residue, sorting out residue powder with a particle size of less than or equal to 2.5mm, and conducting air drying; and S2. grinding the residue powder of S1 for 10-20min to obtain regenerated fine powder. The regenerated fine powder has the following main component and technical index range: 45 micrometer square hole sieve residue of less than or equal to 30%, a water demand ratio of less than or equal to 115%, a loss on ignition of less than or equal to 8%, a water content of less than or equal to 0.9%, a free calcium oxide content of less than or equal to 0.35%, a sulfur trioxide content of less than or equal to 0.4%, a density of 2.5-2.7g/cm<3>, mortar fluidity of larger than or equal to 90%, and a strength activity index of greater than or equal to 70%. The regenerated fine powder can be used for preparation of mortar and concrete.

Description

technical field [0001] The invention belongs to the field of recycling of solid waste, and in particular relates to a method for preparing regenerated fine powder from waste slag in a concrete mixing station, the prepared regenerated fine powder and its application. Background technique [0002] In the process of producing ready-mixed concrete, if its workability does not meet the standard, it will be returned. Concrete mixing plants generally separate the sand and gravel for further use of these returned materials, but the resulting waste slurry sediment—waste slag is directly fished out and piled on the ground. This treatment method of waste slag not only occupies a large area of ​​land, but also causes environmental pollution, which is contrary to the strategy of gradually developing the concrete mixing plant from a large-scale model to a green and environmental protection model advocated in recent years. Therefore, the treatment and utilization of these piled up concret...

Claims

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Application Information

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IPC IPC(8): C04B18/16C04B28/02C04B14/06C04B18/08
CPCY02W30/91
Inventor 彭春元余斌彭涓许日昌
Owner GUANGZHOU UNIVERSITY
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