Method for preparing porous wollastonite ceramic membrane for membrane distillation desalination through dry pressing by taking blast furnace slag as main raw material

A main raw material, dry pressing technology, applied in the field of desalination, can solve the problem of high energy consumption

Inactive Publication Date: 2021-06-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Seawater desalination technologies mainly include heat treatment and membrane treatment. The former has the advantages of large output and mature technology, but consumes a lot of energy. Membrane treatment has attracted widespread attention in recent years.

Method used

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  • Method for preparing porous wollastonite ceramic membrane for membrane distillation desalination through dry pressing by taking blast furnace slag as main raw material
  • Method for preparing porous wollastonite ceramic membrane for membrane distillation desalination through dry pressing by taking blast furnace slag as main raw material
  • Method for preparing porous wollastonite ceramic membrane for membrane distillation desalination through dry pressing by taking blast furnace slag as main raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 42g of blast furnace slag and 13.22g of SiO 2 , 4.78g CaO, and 40g of PMMA powder with a particle size of 10μm was weighed and added to the ball milling jar together. The addition amount of the two symmetrical ball milling jars was the same. Add 150ml of absolute ethanol to each ball milling jar and mill for 5 hours. Then transfer the ball-milled slurry to a beaker, put it in a drying oven at 80° C. for 12 hours, grind the dried sample, and pass through a 200-mesh standard sieve. Weigh 1.2 g of the sieved powder and put it into a circular abrasive tool, hold the pressure at 20 MPa for 1 min, and press it into a tablet. After room temperature, take it out and wash it alternately with deionized water and ethanol, and dry it at 100°C for 24 hours. Take 10g of polymethylhydrogensiloxane and dissolve it in 90g of n-hexane to form polymethylhydrosiloxane with a mass fraction of 10% (too low the concentration of the modifier will make the surface of the ceramic membrane...

Embodiment 2

[0028] Weigh 49g of blast furnace slag and 15.42g of SiO 2 , 5.58g CaO, and weigh 30g of PMMA powder with a particle size of 10μm and add them to the ball milling jar together. The two symmetrical ball milling jars have the same amount of addition. Add 150ml of absolute ethanol to each ball milling jar and mill for 5 hours. Then transfer the ball-milled slurry to a beaker, put it in a drying oven at 80° C. for 12 hours, grind the dried sample, and pass through a 200-mesh standard sieve. Weigh 1.2 g of the sieved powder and put it into a circular abrasive tool, hold the pressure at 20 MPa for 1 min, and press it into a tablet. After room temperature, take it out and wash it alternately with deionized water and ethanol, and dry it at 100°C for 24 hours. Get 10g of polymethylhydrogensiloxane and dissolve it in 90g of n-hexane to form a polymethylhydrogensiloxane organic solution with a mass fraction of 10%, transfer the dried ceramic sheet to a porcelain boat, add the above solu...

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Abstract

The invention discloses a method for preparing a porous wollastonite ceramic membrane for membrane distillation desalination through dry pressing by taking blast furnace slag as a main raw material, and belongs to the technical field of desalination. Blast furnace slag is taken as a main raw material, polymethyl methacrylate is taken as a pore-forming agent, the porous wollastonite ceramic membrane is prepared at low cost through dry-pressing solid-phase reaction, polymethylhydrosiloxane is taken as a modifier, hydrophobization treatment is performed on the porous wollastonite ceramic membrane by adopting a pyrolysis method, and the hydrophobic porous wollastonite ceramic membrane can be used for membrane distillation desalination. The method comprises the following steps: uniformly mixing the blast furnace slag with calcium oxide and silicon dioxide, adding a certain amount of polymethyl methacrylate, carrying out ball milling, drying and sieving to obtain a ceramic raw material, tabletting the ceramic raw material into a ceramic membrane blank, and calcining to obtain the wollastonite ceramic membrane with a good porous structure. The wollastonite porous ceramic membrane subjected to hydrophobization treatment can be used for membrane distillation desalination. The ceramic membrane has high water flux, and the desalination rate is close to 100%.

Description

technical field [0001] The invention relates to a method for preparing a porous wollastonite ceramic membrane for membrane distillation desalination by using blast furnace slag as a main raw material for dry pressing, and belongs to the technical field of desalination. Background technique [0002] Water is the basic substance that human beings rely on for survival and life, and it is also an irreplaceable natural resource on the earth. With the continuous growth of the world population and the continuous development of human society, the human demand for fresh water resources is getting higher and higher. The shortage of water resources has become increasingly prominent, and has become a worldwide social crisis and one of the most severe challenges facing mankind. It is the consensus of all countries in the world to develop seawater desalination (desalination) technology and ask for water from the ocean. Seawater desalination technologies mainly include heat treatment and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D61/36B09B3/00
CPCB01D71/027B01D67/0039B01D61/364B09B3/00B01D2323/12B01D2323/08B01D2323/50B01D2323/10
Inventor 韦奇邓婷婷王亚丽崔素萍
Owner BEIJING UNIV OF TECH
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