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Method for removing ions in nano-level zirconium dioxide hydrate particle-water system

A hydrate and nano-scale technology, applied in the field of membrane separation, can solve problems such as no specific reports on the operation method, and achieve the effects of reducing agglomeration, high membrane flux, and reducing membrane clogging

Inactive Publication Date: 2007-05-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The reported literature mentioned the preparation of nanoscale ZrO 2 During the process, the removal of Cl - There is no specific report on the operation method of other impurity ions

Method used

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  • Method for removing ions in nano-level zirconium dioxide hydrate particle-water system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Referring to Fig. 1, at room temperature, the polyethersulfone (PES) ultrafiltration flat membrane device (membrane module) with a molecular weight cut-off of 50K is adopted to treat nanometer ZrO 2 The hydrated feed solution (Cl-concentration is 0.55mol / L, solid content is 5g / L) is concentrated and desalted. Operate the high-pressure pump so that the pressure displayed by the pressure gauge is 0.4MPa, the amount of feed liquid added to the material tank is 3.0L, and the reflux ratio is 20. The experiment is carried out according to the above steps. When the feed liquid is concentrated to 1.5L, add 1.5L of distilled water for dilution and sleeve washing, and the water addition ratio is 0.5. When the feed liquid volume is concentrated to 1.5L again, add 1.5L distilled water again and carry out dilution cover washing, through multiple cover washing, the Cl of concentrated solution - The concentration is 1.17×10 -5 mol / L, the average membrane flux is maintained at 295L / m...

Embodiment 2

[0026] Using polyethersulfone (PES) ultrafiltration flat membrane equipment with a molecular weight cut-off of 30K, the 2 Hydrated material liquid (Cl - The concentration is 0.55mol / L, and the solid content is 15g / L) for concentration and desalination. The operating pressure is 0.21MPa, the feed liquid volume is 3.0L, and the reflux ratio is 25. The experiment is carried out according to the above steps. When the feed liquid is concentrated to 2.5L, distilled water is added for dilution and top washing, and the water addition ratio is 0.17. After several washes, the Cl of the concentrate - The concentration is 8.78×10 -5 mol / L, the average membrane flux is maintained at 50L / m 2 .h and above. During the experiment, samples were taken every 10 minutes for testing.

Embodiment 3

[0028] Using polyethersulfone (PES) ultrafiltration flat membrane equipment with a molecular weight cut-off of 100K, the 2 Hydrated material liquid (Cl - The concentration is 0.55mol / L, and the solid content is 5g / L) for concentration and desalination. The operating pressure is 0.35MPa, the feed liquid volume is 3.0L, and the reflux ratio is 20. The experiment is carried out according to the above steps. When the feed liquid is concentrated to 1.2L, add 1.0L distilled water for dilution and sleeve washing, and the water addition ratio is 0.55. After several washes, the Cl of the concentrate - The concentration is 7.74×10 -5 mol / L, the average membrane flux is maintained at 85L / m 2 .h and above. During the experiment, samples were taken every 15 minutes for testing.

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Abstract

This invention relates to a method for desalting and separating various inorganic ions in the system of nano zirconium dioxide hydrate particles using ultra-filtration membrane separation technology. The procedure is as follow: first, pour feed liquid into the bucket, start up the high pressure pump, adjust the bypass valve and observe its flux change; then, infuse water for washover after feed liquid is condensed, then take the sample solution to measure ion concentration; finally end washover until the heteroion content in condensed solution meets the qualitative requirements. According to the membrane aperture separation mechanism, the aqueous solution containing ions such as Cl-,, OH-, NO3-, SO42-, NH4+, Na+, Ca2+ and Mg2+ etc. , can permeate through membrane under the drive of a certain pressure and ZrO2 nano-particles are entrapped. Thus the ions in the system of nano ZrO2 hydrate and salt solution of different concentration are absolutely removed to get the nano ZrO2 particles with smaller grain-size and larger specific surface.

Description

technical field [0001] The invention relates to a membrane separation method, in particular to the use of ultrafiltration membrane separation technology for nano zirconium dioxide (ZrO 2 ) hydrate granular system for desalination and separation, including removal of Cl - , OH - , NO 3 - , SO 4 2- , CO 3 2- 、HCO 3 - , NH 4 + 、Na + , Ca 2- , Mg 2+ and so on for all kinds of inorganic ions. Background technique [0002] Nanoparticles (tiny solid particles with a particle size of 1-100nm) are increasingly becoming the focus of research in various countries due to their unique properties. With the superfineness of the material, its surface atomic structure and crystal structure change, resulting in surface effects, volume effects, quantum size effects and macroscopic quantum tunneling effects that bulk materials do not have, making nanoparticle materials different from conventional particle materials. Compared with a series of excellent physical and chemical prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02
Inventor 夏海平何旭敏蓝伟光董海峰李昕丁马太
Owner XIAMEN UNIV