Abstract Filter assembly for filtering solids from molten aluminum metal comprises at least one open-ended rigid refractory filter tube having an interior passageway, a bottom plate acting to close one end of such tube, a top plate having an aperture communicating with the interior passageway of such filter tube, and means, such as a tie bolt, with a fastener device to maintain the top and bottom plate and the interposed filter tube or tubes in sealed relationship so that the molten metal will flow through the walls of the rigid refractory filter tube without leakage at the ends or joints, to efficiently remove solid contaminants from the metal. The plates and tie rod or the like are of metal resistant to attack by molten aluminum, advantageously of cast iron. The refractory material of the tubes contains refractory particles resistant to molten aluminum and a bonding agent containing not over 10 percent silica.
An assembly as in claim 1, having also means to grasp and lift said cartridge.
Claim 2
Dependent Claim
350 words
A demountable cartridge for filtering molten aluminum comprising in combination: a. at least one filter tube having an interior passageway and formed of a rigid porous material having inner-communicating pores, said material consisting essentially of a fired mixture of refractory particles resistant to attack by molten aluminum, said particles having an average maximum diameter of from about 0.165 to about 2.8 mm, and a prefused vitreous bonding material consisting essentially of, by weight, from 15% to 80% boron oxide, from 5% to 50% calcium oxide and from 2% to 60% aluminum oxide and not more than 10% silica said bonding material being uniformly dispersed throughout said mixture, surrounding said particles and adhering them together, b. a first metal plate resistant to attack by molten aluminum adjacent one end of said filtering tube, said plate having at least one aperture adapted to receive a tie rod and an aperture for each filter tube adapted to be in fluid communication with the interior passageway of said filter tube and having a peripheral recess in the under face of the metal plate, c. a second metal plate resistant to attack by molten aluminum adjacent the opposite end of said filter tube, said plate having in its upper face a recess for each filter tube and means for attachment thereto of said tie rod, d. a compressible refractory sealant material resistant to attack by molten aluminum disposed between the ends of each filter tube and said plates, whereby the plates and tubes are maintained in sealed relationship upon expansion thereof, and e. at least one tie rod and fastening means formed of a metal resistant to attack by molten aluminum joining said first and second plates and said tubes so as to effect a sealed relationship between the ends of said filter tubes and said plates, the tie rod passing through the aperture provided for it in the first plate and attaching to the second plate and the tie rod and fastening means being adapted to allow for the tightening of said plates against said tubes when the cartridge is heated to operating temperatures.
Claim 3
Dependent Claim
17 words
The cartridge of claim 3 wherein said plates, tie rod and fastening means are of cast iron.
Claim 4
Dependent Claim
14 words
The cartridge of claim 3 having a means to grasp and lift said cartridge.
Claim 5
Dependent Claim
17 words
The cartridge of claim 3 wherein said compressible refractory sealant material is a fibrous alumina-silica sheet material.
Claim 6
Dependent Claim
11 words
The cartridge of claim 3 wherein said refractory particles are alumina.