Recycled material terrace brick and preparation method thereof

A technology of floor tiles and cementitious materials, which is applied in the field of building materials, can solve problems such as the difficulty in bulk utilization of Bayer process red mud, and achieve the effects of reducing pollution, reducing waste of resources, and reducing manufacturing costs

Inactive Publication Date: 2020-08-21
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Whether it is for the recovery of valuable metals or for environmental restoration, it is difficult to realize the bulk utilization of Bayer process red mud, which has become a major difficulty in the comprehensive utilization of red mud resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0028] The present invention also provides a specific embodiment of the preparation method of the above-mentioned recycled material floor tile, comprising the following steps:

[0029] (1) Weigh the red mud, petroleum coke desulfurization ash, carbide slag, slag and river sand according to the mixing ratio of raw materials, and set aside;

[0030] (2) Dry and grind red mud, petroleum coke desulfurization ash, carbide slag and slag, mix them in proportion, and then add river sand to obtain a uniform mixture;

[0031] (3) Put the mixture into the mortar mixing container, add appropriate amount of water and stir, pour it into shape after fully stirring, place it indoors for 20-30 hours, remove the formwork, and then maintain it in the natural environment for 25-30 days, you can get Red mud unburned tailings brick.

Embodiment 1

[0035]The Bayer process red mud, petroleum coke residue, carbide slag and slag are dried and ground, then mixed in proportion, and part of the river sand is added. Put the mixture into a mortar mixing pot, add appropriate amount of water and stir, fully stir and then cast into shape, place it indoors for 1 day, remove the formwork, and finally maintain it in the natural environment for 28 days to obtain red mud burnt-free tailings bricks. Specific ratio (mass percentage): Bayer process red mud 12.25%, petroleum coke desulfurization ash 3.5%, carbide slag 1.75%, slag 7.5%, river sand 75%, plus 0.2% polycarboxylate superplasticizer, 12.5% water. Casting molding 40×100×200mm 3 The pavement brick has a 28d flexural strength of 6.6MPa, a compressive strength of 21.8MPa, an average water absorption of 8.4%, a drying shrinkage of 0.512mm / m, a softening coefficient of 1.07, and a mass loss rate of 0 after 25 slow freeze-thaw cycles. The loss rate is 9.05%.

Embodiment 2

[0037] The Bayer process red mud, petroleum coke residue, carbide slag and slag are dried and ground, then mixed in proportion, and part of the river sand is added. Put the mixture into a mortar mixing pot, add appropriate amount of water and stir, fully stir and then cast into shape, place it indoors for 1 day, remove the formwork, and finally maintain it in the natural environment for 28 days to obtain red mud burnt-free tailings bricks. Specific ratio (mass percentage): Bayer red mud 24.5%, petroleum coke desulfurization ash 7%, carbide slag 3.5%, slag 15%, river sand 50%, plus 0.5% polycarboxylate superplasticizer, 15% water. Casting molding 40×100×200mm 3 The pavement brick has a 28d flexural strength of 10.3MPa, a compressive strength of 43.0MPa, an average water absorption of 2.6%, a drying shrinkage of 0.465mm / m, a softening coefficient of 1.0, and a mass loss rate of 0 after 25 slow freeze-thaw cycles. The loss rate is 1.88%.

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Abstract

The invention provides a recycled material terrace brick and a preparation method thereof. Raw materials comprise a cementing material and aggregate, and the recycled material terrace brick is characterized in that the cementing material accounts for 25%-50% of the total mass of the raw materials, the aggregate accounts for 50%-75% of the total mass of the raw materials, the cementing material comprises the following components: red mud, petroleum coke desulfurization ash, carbide slag, slag powder, water glass and sodium sulfate, and the aggregate is river sand. The preparation method comprises the following steps: weighing the raw materials in proportion for later use; drying and grinding the red mud, the petroleum coke desulfurization ash and the carbide slag, uniformly mixing the previous raw materials with the slag powder, adding the river sand to obtain a uniformly mixed mixture, putting the mixture into a mortar stirring container, adding a proper amount of water, stirring, pouring, molding, placing indoors for 20-30 hours, demolding, and maintaining for 25-30 days. Waste resources are utilized, environmental pollution can be reduced, and the manufacturing cost of the terrace brick is reduced. The preparation method is rapid, simple and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the fields of civil engineering, solid waste resource recycling and building materials, and specifically relates to a recycled material floor tile and a preparation method thereof. Background technique [0002] In recent years, my country's alumina production has accounted for more than 50% of the global production. As of March 2017, my country's alumina production capacity reached 70.71 million tons. The huge production capacity also promotes the development of my country's aluminum industry. At present, the Bayer process is the main method of producing alumina, and its output accounts for about 90% of the world's total alumina production. Its main advantage is that it can effectively reduce energy consumption. However, raw materials such as caustic soda and lime are usually added during the production of alumina by the Bayer process. While the alumina is being dissolved, other alkali-insoluble substances are filtered out. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B28/10E01C5/06E04F15/02C04B18/04C04B111/60
CPCC04B28/10C04B28/26C04B2111/60E01C5/06E04F15/02C04B18/0409C04B18/064C04B18/141C04B14/068C04B2103/302Y02W30/91
Inventor 高嵩侯东帅侯双明李楠金祖权李秋义张蕾黄庆强
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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