Abstract: Method and device of separating materials of different density by ferromagnetic liquid, using the separation zone formed by a set of magnets disposed so as to form a V-shaped gutter with both of the pole faces thereof. Objects to be separate are moved crosswise to the gutter by forming the separation zone extending in the range of the opening portion of the V-shaped gutter in such a manner that the separation zone is sloping in a plane across the gutter. This permits separation of materials of larger size in comparison with prior methods. The device is suitable for separating materials having larger size such as scraps of automobile containing aluminum and its alloys having a relatively large size and adapted to be separated from other heavy materials such as copper, zinc and their alloys.

Abstract: A water base magnetic fluid is provided by adding an unsaturated fatty acid with 18 carbon atoms or a salt thereof into a colloidal solution of a ferromagnetic oxide power in water, subsequently adding an acid solution to the colloidal solution to develop a precipitate by a flocculation, separating the precipitate from the solution, and adding an anionic surfactant with 8 to 30 carbon atoms, or a non-ionic surfactant with 8 to 20 carbon atoms and with H.L.B. of 12 or more, to the separated precipitate in water to peptize the precipitate. The water base magnetic fluid is a stable suspension of the ferromagnetic powder in water. Each particle of the ferromagnetic powder in the fluid is coated with a monomolecular layer of the ionized unsaturated fatty acid and with the non-ionic or anionic surfactant layer being adsorbed on the first monomolecular layer. The average particle size of the ferromagnetic powder may be 150 A or less.

Abstract: Waste glass containing three-dimensional extraneous matter to be removed is dropped onto a grizzly and is thereby broken up by gravity and separated into an undersize portion containing planar fragments of waste glass and of extraneous matter and an oversize portion containing three-dimensional large pieces of waste glass and unbreakable extraneous matter, the grizzly comprising parallel bars arranged at a spacing smaller than the minimum width of projection of the three-dimensional extraneous matter. The oversize portion is repeatedly subjected to the same procedure as above to break up the waste glass to an undersize material within a specified range of sizes and to remove the three-dimensional extraneous matter from the waste glass. A breaking and separating apparatus comprises grizzlies arranged in multi-stage fashion within a passage for dropping the waste glass or a rotatable drum-shaped grizzly having scraping plates.

Abstract: Water is supplied to an inclined drum having a helical wall on its inner peripheral surface to cause the water to flow over the helical wall and also on the inner peripheral surface of the drum and to thereby form a flow of water running from the upper end of the drum to its lower end. Waste glass is fed to the drum while the drum is rotated at a high speed. During falling of the waste glass onto the flow of water, during settling of the waste glass in the water flow while it is being sent toward the drum upper end by the helical wall, and while the settled waste glass is maintained by the high-speed rotation of the drum in a suspension-resembling state in which pieces of the waste glass are dispersible and in rocking motion circumferentially of the drum, extraneous matter is forced toward the drum lower end and run off therefrom due to its resistance per unit weight thereof to the flow of water which resistance is greater than that of the waste glass.