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Reclaimed active ultrafine powder and preparation method thereof

An ultrafine powder and active technology, which is applied in the field of regenerative active ultrafine powder and its preparation, can solve the problems of reusing unhydrated cement particles, etc., and achieve low heat of hydration, large Blaine specific surface area, hardening and drying small shrinkage effect

Inactive Publication Date: 2013-06-05
北京元泰达环保科技有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing regenerated active ultrafine powder, aiming to solve the problem that the unhydrated cement particles in the existing construction waste cannot be reused well

Method used

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  • Reclaimed active ultrafine powder and preparation method thereof

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] figure 1 The flow chart of the preparation method of the regenerative active ultrafine powder provided by the embodiment of the present invention is shown, and the details are as follows:

[0025] First, the waste concrete is conveyed into the feed hopper.

[0026] In step S101, the first stage coarse crushing is performed on large pieces of construction waste, and the steel bars and concrete in the construction waste are separated. This step can be realized by using a jaw crusher.

[0027] In step S103, plastics, cloth strips, bricks and tiles and other sundries in the construction waste ...

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Abstract

The invention is applicable to the field of construction materials, and provides a reclaimed active ultrafine powder and a preparation method. The method is implemented by sequentially carrying out primary crushing, impurity removal, secondary crushing, tertiary crushing, metal removal, calcination, primary grinding, screening, secondary grinding and recalcination on construction waste. The invention uses waste concrete as the raw material to prepare the reclaimed active ultrafine powder which can be substituted for cement, thereby solving the problem in treatment of construction waste, and recycling the construction waste. The reclaimed active ultrafine powder provided by the invention has the advantages of large Blaine specific surface area, smaller curing dry shrinkage and very low hydration heat. Compared with Portland cement, the invention can obtain 28-day equal strength.

Description

[0001] technical field [0002] The invention belongs to the field of building materials, and in particular relates to a regenerative active ultrafine powder and a preparation method thereof. Background technique [0003] At present, the world's annual concrete output is about 28×108m3, while China's annual concrete output accounts for 45% of the world's annual output. The materials for preparing concrete will eventually be consumed one day, and limestone resources are already in a severe situation of increasing shortage. In the face of large-scale urban construction in our country, along with the birth of new buildings, a large number of old buildings have been demolished, resulting in a large number of abandoned buildings. It is conservatively estimated that my country produces about 100 million tons of waste concrete every year, while the annual output of waste concrete in the world is as high as more than one billion tons. Waste concrete brings huge pressure on resources...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCY02P40/10
Inventor 邢丽君谢小元杨欣吴波玲李建勇
Owner 北京元泰达环保科技有限公司
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