Method for preparing diatomite hollow fiber ceramic membrane

A diatomite and ceramic membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high raw material cost and high sintering temperature, and achieve scientific and reasonable methods, strong applicability, and good effects. Effect

Inactive Publication Date: 2016-08-17
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing diatomite hollow fiber ceramic membranes

Method used

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  • Method for preparing diatomite hollow fiber ceramic membrane
  • Method for preparing diatomite hollow fiber ceramic membrane
  • Method for preparing diatomite hollow fiber ceramic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 5g of polymer polyethersulfone (PES), 7.5g of porogen polyethylene glycol (PEG1000) into 65g of organic solvent N,N-dimethylacetamide (DMAc), and heat in a water bath at 75°C , mechanically stirred for 6 h to fully dissolve the polymer.

[0027] Add 30.5g of diatomaceous earth and 28g of alumina to the polymer solution as inorganic particles and 4g of low-temperature sintering aid V required for sintering 2 o 5 , continue to heat in a constant temperature water bath and mechanically stir for 24 h to obtain a casting solution.

[0028] Put the prepared casting liquid into the slurry tank of the spinning machine, vacuumize at 60° C. for 4 hours to remove residual air bubbles, and let it stand for 20 hours for defoaming. Install the prepared hollow fiber liner in the spinning head, adjust the extrusion rate of the casting solution to 2mL / min, the extrusion rate of the liner to 2cm / min, adjust the air distance to 2cm, and set the temperature of the coagulation bath to...

Embodiment 2

[0032] Add 22.5g of polymer polysulfone (PS) and 7.5g of porogen polyethylene glycol (PEG400) into 67.5g of organic solvent N-methylpyrrolidone (NMP), heat in a water bath at 70°C, and stir mechanically 4 h to fully dissolve the polymer.

[0033] Add 24.3g of diatomaceous earth and 20.7g of alumina as inorganic particles and 7.5g of low-temperature sintering aid AlF required for sintering into the polymer solution 3 , continue to heat in a constant temperature water bath and mechanically stir for 20 h to obtain a casting solution.

[0034] Put the prepared casting solution into the slurry tank of the spinning machine, vacuumize at 65° C. for 5 hours to remove residual air bubbles, and let it stand for 20 hours for defoaming. Install the prepared hollow fiber liner in the spinning head, adjust the extrusion rate of the casting solution to 2mL / min, the extrusion rate of the liner to 2cm / min, adjust the air distance to 2cm, and set the temperature of the coagulation bath to 20 °C...

Embodiment 3

[0038] Mix 15g of polymer: polyvinylidene fluoride (PVDF), 7.5g porogen K 30 , was added to 65g of organic solvent N-methylpyrrolidone (NMP), heated in a water bath at 65°C, and mechanically stirred for 5 hours to fully dissolve the polymer.

[0039] Add 30.5g of diatomite and 28g of alumina to the polymer solution as inorganic particles and 4g of low-temperature sintering aid CaCO required for sintering 3 , continue to heat in a constant temperature water bath and mechanically stir for more than 22 h to obtain a casting solution.

[0040] Put the prepared casting solution into the slurry tank of the spinning machine, vacuumize at 60° C. for 4 hours to remove residual bubbles, and let it stand for 20 hours for defoaming. Install the prepared hollow fiber liner in the spinning head, adjust the extrusion rate of the casting solution to 2mL / min, the extrusion rate of the liner to 2cm / min, adjust the air distance to 2cm, and set the temperature of the coagulation bath to 20 °C f...

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Abstract

The invention relates to the technical field of membranes for water treatment, and relates to a preparation method for preparing a hollow fiber ceramic membrane by using relatively cheap diatomite as a raw material, adopting a phase inversion method and a dry-wet coating spinning technology combined with low-temperature sintering , used in large-scale industrial water microfiltration treatment with harsh conditions such as acid-base corrosion and high temperature. The diatomite hollow fiber ceramic membrane is formed in one step by the phase inversion method, and is formed by adding sintering aids and sintered at low temperature, which not only effectively protects the pore structure of the diatomite itself, but also obtains a ceramic membrane with good strength. The ceramic membrane has the excellent characteristics of the hollow ceramic membrane, and has the advantages of low price of raw materials, low sintering temperature, and easy realization of large-scale production.

Description

technical field [0001] The invention belongs to the technical field of membranes for water treatment, in particular to a preparation method of a diatomite hollow fiber ceramic membrane, which is suitable for acid-base, high-temperature large-scale chemical industry, drinking water and other water treatment. Background technique [0002] At present, commercialized hollow fiber ceramic membranes are mostly made of nanometer A1 2 o 3 And YSZ as the main material, although it has good properties of ceramic membrane, but this kind of raw materials are mainly nano-scale materials, and the sintering temperature needs to be above 1400 ℃, expensive raw material prices and high sintering temperature limit its large-scale industrial applications. [0003] Diatomite has a wide range of sources, is cheap, and has a large number of micropores. In addition, its pores will collapse when the temperature exceeds 1200 ° C. It has been reported to use the pores of diatomite itself to obtain p...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/08B01D67/00C02F1/44
CPCB01D71/02B01D67/0041B01D69/08C02F1/444
Inventor 张瑛洁崔学军姜永久庄媛媛
Owner NORTHEAST DIANLI UNIVERSITY
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