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Application of waste concrete to fluorine removal in water

A technology for waste concrete and water body, applied in the field of waste resource utilization, can solve the problems of high defluorination cost and secondary pollution, and achieve the effects of stable defluorination effect, high utilization efficiency and wide source.

Active Publication Date: 2018-01-05
YANGTZE NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide the application of waste concrete in the defluorination of water bodies, so as to solve the problem of secondary pollution caused by a large amount of waste concrete, and at the same time solve the problem of high cost of defluorination of existing chemical agents. question

Method used

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  • Application of waste concrete to fluorine removal in water
  • Application of waste concrete to fluorine removal in water
  • Application of waste concrete to fluorine removal in water

Examples

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Effect test

Embodiment 1

[0036] To use waste concrete to treat fluoride-containing wastewater, first use waste concrete to prepare water body defluoridation agent, the steps are as follows:

[0037] (1) Select waste concrete from construction waste, and use a small hammer crusher for primary crushing, use a square hole sieve to control the particle size of the waste concrete after primary crushing d≤10mm, and put the waste concrete after primary crushing into a muffle furnace Low-temperature pre-calcination is carried out to weaken the bond strength between the aggregate and cement stone in the waste concrete. The specific calcination conditions are: heating up to 200°C at a rate of 6°C / min, keeping the temperature for 20 minutes and then cooling naturally to 25°C.

[0038](2) Vibrate the calcined waste concrete in an electromagnetic vibrating pulverizer to separate the coarse aggregate from the waste cement stone, and put the separated cement stone into a ball mill for grinding to further increase its...

Embodiment 2

[0042] First use waste concrete to prepare water body defluoridation agent, the steps are as follows:

[0043] (1) Select waste concrete from construction waste, and use a small hammer crusher for primary crushing, use a square hole sieve to control the particle size of the waste concrete after primary crushing d≤10mm, and put the waste concrete after primary crushing into a muffle furnace Low-temperature pre-calcination is carried out to weaken the bond strength between the aggregate and cement stone in the waste concrete. The specific calcination conditions are: heating up to 400°C at a rate of 8°C / min, keeping the temperature for 20 minutes and then cooling naturally to 20°C.

[0044] (2) Vibrate the calcined waste concrete in an electromagnetic vibrating pulverizer to separate the coarse aggregate from the waste cement stone, and put the separated cement stone into a ball mill for grinding to further increase its microstructure defects , to increase its specific surface ar...

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Abstract

The invention discloses application of waste concrete to fluorine removal in water. During application, the method comprises the following steps: (1) primarily crushing and calcining the waste concrete serving as a raw material, screening out cement stone, ball-milling the cement stone, performing powder selecting separation and collecting particles with the particle size being below 80 [mu]m to obtain a water fluorine removing agent; and (2) throwing the water fluorine removing agent obtained in the step (1) into fluorine-containing wastewater to remove the fluorine from the wastewater. Application of the building waste, namely waste concrete, is enlarged to the field of treatment of the fluorine-containing wastewater, the water fluorine-removing material is prepared, the reaction speed is high in the water fluorine removing process, limit doped amount does not exist, the utilization efficiency is high, the fluorine-removing effect is stable, operation can be conducted at room temperature, the resource utilization efficiency of the waste cement stone is improved, and a technological route is provided for high-additional-value utilization of hardened cement stone in the waste concrete.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste, and in particular relates to the application of waste concrete in defluoridation of water bodies. Background technique [0002] A large amount of construction waste will be generated in the construction, decoration, demolition and other construction activities of buildings or structures, and with the rapid advancement of my country's infrastructure and the acceleration of urbanization, the amount of construction waste continues to increase. According to statistics, about 1 / 3 of urban waste is construction waste; by the end of 2011, its stock has exceeded 2 billion tons, and the annual increase of construction waste exceeds 300 million tons. Due to improper site selection or temporary stacking of construction waste landfill plants in most cities, it not only causes a lot of waste of land resources, but also poses great safety hazards. At the same time, construction waste interacts wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/52C02F101/14
Inventor 刘东升冉媚周丽新陈昔勇张维白俊洲时建伟张鹏吕利平
Owner YANGTZE NORMAL UNIVERSITY
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