Liquid purification or separation – Processes – Separating
Patent
1999-01-28
1999-12-07
Woo, Jay H.
Liquid purification or separation
Processes
Separating
210780, C02F 1112
Patent
active
059977531
ABSTRACT:
The inability to settle mining tailings, pulps, slurries, and other wastes in form of hard sediments and forced storage of jelly-like sludge in tailings ponds have a great economic and environmental impact. This feature is caused by suspension force arising due to high neutral pressure. The drag caused by friction between sinking solid particles and immovable water generates the upward directed suspension force that decreases the unit weight of solid particles, and they settle extremely slowly. On sufficient concentration of solid particles they become weightless and further settling is ceased. The solid particles remain suspended for a long time. The suspension force can be destroyed by greater oppositely directed seepage force. For this purpose the suspension is supplied into a container with permeable member, low pressure acting on its downstream surface is ensured, and passage of liquid through the permeable member is initiated. A downward directed seepage force is formed in the permeable member. A rather rapid settling of solid particles occurs, and dense sediment is obtained. A number of auxiliary methods can be used, such as vibration for destroying loose structure formed by rigid angular grains, diluting of thick suspensions for initiating seepage, vacuuming for increasing the hydraulic gradient in open containers, applying supplementary hydrostatic pressure above the permeable member for increasing the hydraulic gradient in closed containers, and using conveyors for continuous processing. The method can be used for purification of liquids by settling the impurities.
REFERENCES:
patent: 4194976 (1980-03-01), Robinsky
patent: 4295973 (1981-10-01), Jain
patent: 5433862 (1995-07-01), Batson
patent: 5549827 (1996-08-01), Batson
patent: 5814230 (1998-09-01), Willis et al.
Morrison Betsey J.
Woo Jay H.
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