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Preparation method of fluorine removal agent for water

A technology of defluoridation agent and water body, which is applied in the field of waste resource utilization, can solve the problems of high cost of defluoridation, secondary pollution of waste concrete, etc., and achieve the effect of wide source of raw materials, increased specific surface area and wide application range

Active Publication Date: 2017-12-29
YANGTZE NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 a method of using waste concrete to prepare a water body defluoridation agent, which solves the problem of high cost of defluorination of existing chemical agents, and at the same time solves the problem of secondary pollution of waste concrete

Method used

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  • Preparation method of fluorine removal agent for water
  • Preparation method of fluorine removal agent for water
  • Preparation method of fluorine removal agent for water

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Embodiment 1

[0026] In this embodiment, the method for preparing water body defluoridation agent by using waste concrete is as follows:

[0027] (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 aggregate and cement stone in waste concrete. The specific calcination conditions are: heating up to 250°C at a rate of 6°C / min, keeping the temperature for 20 minutes and then cooling naturally to 25°C.

[0028] (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 specif...

Embodiment 2

[0031] In this embodiment, the method for preparing water body defluoridation agent by using waste concrete is as follows:

[0032] (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.

[0033] (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 it...

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Abstract

The invention disclose a preparation method of a fluorine removal agent for water. The method includes: waste concrete is used as the raw material and subjected to primary crushing and calcining to screen out set cement, and the set cement is subjected to ball milling and powder selection and separation to collect particles with the particle size being below 80 micrometers so as to obtain the fluorine removal agent for water. The preparation method has the advantages that the waste concrete is used to prepare the fluorine removal agent, and the method is wide in raw material source and low in cost and provides a new approach for the recycling of the waste concrete; the method which is simple to operate, widely applicable, low in cost, environmentally friendly and capable of using waste materials to treat pollution is provided for the treatment of fluorine-containing wastewater of rivers and lakes of China, industrial and domestic fluorine-containing wastewater of China, and the like; the recycling efficiency of waste set cement is increased, and a technical path is provided for the high-additional-value utilization of the hardened cement paste in the waste concrete.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste, and in particular relates to a preparation method of a water body defluorination agent. 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 with water in...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/14
CPCC02F1/583C02F2101/14
Inventor 刘东升周丽新李巍陈昔勇刘艳
Owner YANGTZE NORMAL UNIVERSITY
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