Process for preparing fluorine reducing ion sieve of aquatic body

A technology of ion sieve and fluoride reduction, applied in the direction of adsorption of water/sewage treatment, crystalline aluminosilicate zeolite, etc., can solve the problems of damage, difficult sludge volume, large power consumption, etc., and achieve fast adsorption speed and high adsorption capacity The effect of high and good mechanical strength

Inactive Publication Date: 2006-01-25
TIANJIN UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the ion exchange method is expensive and has strict requirements on water quality; the electrocoagulation method has complicated devices and consumes a lot of power; and the fluorine content of the water treated by the chemical precipitation method and the coagulation sedimentation method is difficult to reach the index of 1 mg / L. The amount of sludge is large; due to the rise of membrane technology represented by reverse osmosis, the practice of applying reverse osmosis and electrodialysis technology to fluorine-containing water treatment is increasing day by day, but due to the characteristics of reverse osmosis and electroosmosis, it does not really apply The fluorine element in the water is removed from the water, but only concentrated into the part of the water that is discharged. This is just a contradictory transfer, and it only provides qualified drinking water one-sidedly.
However, fluorine still exists in water bodies, and the problem of fluorine pollution in water has not been completely solved, and the possibility of causing harm to people still remains.
If further consideration is given to the consumption of electric energy and the waste of discharged waste water, its value may be negative
Especially in areas with high fluorine water in my country, generally water-scarce areas and areas with relatively backward economy, it is unreasonable and uneconomical to use membrane technology characterized by desalination to treat fluorine-containing drinking water
The most widely used adsorption method to remove fluoride is the activated alumina method. This method has a low saturated adsorption capacity when the fluoride ion content in the water body is 1mg / L, and there is a possibility that the dissolved aluminum ions may affect human health.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Add 25% sulfuric acid dropwise to 0.1mol / L sodium silicate aqueous solution under the stirring condition of 60 rev / min, and form silica gel when the pH reaches 7~8, and age at a temperature of 25~30°C 12 hours. After the aging of the silica gel is complete, 0.01 mol / L zirconium oxychloride aqueous solution is added dropwise to the gel system at a rate of 10 ml / min under the stirring condition of 40 rpm. The sample obtained at the time of completion is a white slurry system, in which gel particles with a particle size of about 3-5 mm are uniformly dispersed, aged for 4 hours, filtered, washed until the chloride ion content in the washing water is less than 10 mg / L, and the solid Dry at 110°C. The dried product is heated to 240°C at a heating rate of 2°C / min, kept for 1 hour, and cooled naturally, that is, the finished product. When this finished product is used to treat raw water with a fluoride ion content of 10mg / L, the average adsorption capacity is 6.8gF / Kg under t...

example 2

[0012] Add 15% sulfuric acid dropwise to 0.075 mol / L sodium silicate aqueous solution under the stirring condition of 55 rev / min, and form silica gel when the pH reaches 7-8, and age at a temperature of 25-30°C 12 hours. After the aging of the silica gel is complete, add a 0.15 mol / L cerium sulfate aqueous solution dropwise to the gel system at a rate of 5 ml / min under the stirring condition of 35 rpm. The sample obtained at the time of completion is a white slurry system, in which gel particles with a particle size of about 3-5 mm are uniformly dispersed, aged for 4 hours, filtered, washed until the chloride ion content in the washing water is less than 10 mg / L, and the solid Dry at 110°C. Heat the dried product to 310°C at a heating rate of 1°C / min, keep it warm for 1.5 hours, and then cool down naturally, that is, the finished product. When this product is used to treat raw water with a fluoride ion content of 10mg / L, the average adsorption capacity is 6.5gF / Kg under the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

A process for preparing the ionic sieve used to de-fluorinate water includes such steps as dripping sulfuric acid to the aqueous solution of sodium silicate while stirring to generate silicate acid gel, ageing to form porous skeleton structure, dripping the aqueous solution of zirconium oxychloride or cerium sulfate to said gel while stirring to obtain de-fluorinating gel, filtering for dewatering, washing, baking, calcining and holding the temp for a certain time. Its advantage is high adsorptive speed and capacity.

Description

technical field [0001] The invention relates to a method for preparing a fluorine-reducing ion sieve for water bodies, and belongs to the field of inorganic fluoride-removing materials. Background technique [0002] At present, the methods for removing fluoride from fluorine-containing water mainly include adsorption method, electrocoagulation method, reverse osmosis method, ion exchange method and coagulation precipitation method. Among them, the ion exchange method is expensive and has strict requirements on water quality; the electrocoagulation method has complicated devices and consumes a lot of power; and the fluorine content of the water treated by the chemical precipitation method and the coagulation sedimentation method is difficult to reach the index of 1 mg / L. The amount of sludge is large; due to the rise of membrane technology represented by reverse osmosis, the practice of applying reverse osmosis and electrodialysis technology to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04C02F1/28
Inventor 孙岩王榕树那平刘剑锋张海燕
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap