CERAMIC FILTER ELEMENT MANUFACTURING PROCESS Russian patent published in 2006 - IPC C04B35/10 C04B41/87 

FIELD: ceramics and filter materials.

SUBSTANCE: invention relates to manufacturing filter element suited to filter pulps and effluents from galvanic shops. Preliminarily, magnesium montmorillonite cake is prepared at temperatures sufficient to remove gas-forming components, which cake is then ground to particle size not less than pore size in permeable surface of substrate. Mix is further prepared from naturally occurring magnesium montmorillonite and cake, content of the latter in mix being within a range of 30 to 70%. Thereafter, aqueous suspension is prepared comprising uniform fused corundum and above mix in solid phase. This suspension is used to deposit membrane material components. Subsequent heat treatment is conducted with isothermal exposure periods at temperatures sufficient to remove physically adsorbed and crystallization moisture, to cause residual gas emission, and melting of fusible components of membrane layer. Cooling to 400°C is conducted under forced air circulation conditions and, below 400°C, under natural heat convection conditions.

EFFECT: strengthened membrane-to-substrate adhesion and increased structural strength.

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