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Method of manufacturing supports for porous filters
| Details |
Inventors: Auriol, Alain; Tritten, Paul;
Assignee: Commissariat a l'Energie Atomique (Paris, FR)
Primary Examiner: Sebastian; Leland A.
Assistant Examiner:
Attorney, Agent or Firm: Kerkam, Stowell, Kondracki & Clarke
The invention relates to a method of manufacturing supports for porous filters. Supports are placed in contact with a first slip coating liquid containing in suspension a mineral powder comprising agglomerates between 10 and 30 microns in diameter, the resulting deposited layer is dried by heating it to approximately 100.degree. C., the layer is brushed so as to remove particles of powder which have not penetrated inside the pores, the thus-treated supports are placed in contact with a second slip coating liquid containing in suspension a mineral powder having a particle size between 1 and 8 microns, and the products obtained are heat-treated at approximately 1500.degree. C. The resulting filters are used for separating isotopes. |
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DETAILED DESCRIPTION We claim: 1.
A method of manufacturing filter supports, wherein rigid macroporous supports having pore diameters of approximately 15 to 20 microns are placed in contact with a first slip coating liquid containing in suspension a powder of refractory oxides comprising agglomerates between 10 and 30 microns in diameter, the resulting deposited layer is dried by heating it to approximately 100.
degree.
C.
, the layer is brushed so as to remove particles of powder which have not penetrated inside the pores, the resulting supports are placed in contact with a second slip coating liquid containing in suspension a powder of refractory oxides having a particle diameter between 1 and 8 microns, and the products obtained are heat-treated at approximately 1500.
degree.
C.
2.
A method of manufacturing filter supports according to claim 1, characterised in that the first slip coating is applied using an aqueous suspension containing 9.
5% alumina.
3.
A method of manufacturing filter supports according to claim 1, characterised in that the second slip coating is applied using an alumina-based slip and an organic binder.
Description:
The invention relates to a method of manufacturing supports for microporous filters having high permeability and, more particularly, to supports for tubular filters used for manufacturing porous filters or barriers used for separating certain isotopes.
The invention also relates to the filter supports thus obtained.
Each filter comprises a microporous layer having a pore diameter of the order of 0.
01 micron and a macroporous support having a pore diameter of the order of a few microns, the two components being strongly bonded to one another.
In order to improve the quality of the supports, i.
e.
increase their permeability without increasing the pore diameter of the microporous layer and without reducing the thickness of the macroporous supports and thus reducing the rigidity and adversely affecting the quality of the filters, it is clearly necessary to increase the pore diameter of the supports
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Manufacturing Materials 
