JPS6233725A - Method for recovering metal by aluminum alloy melted slag - Google Patents

Abstract

PURPOSE:To recover good quality metal with a good recover ratio, by throwing melted slag into gap between crushing members of a vertical crusher and crushing the slag preferentially so that it is stayed at crushing gap from table upper surface to separate metal from slag. CONSTITUTION:The melted slag 1 is thrown into a crushing member gap 14 composed of a table 15 and a roller 11 being crushing members of the vertical crusher 10, through a supplying machine 2. The table 15 is revolved and driven around vertical shaft by a driving gear 17 through a reduction gear 16, on the other hand, pressing force is rockably impressed to the roller 11 by a pressing means 12, the slag 1 is pressed, crushed, ground and discharged from an aperture 18. At this time, since slag is crushed preferentially compared with metal, slag adhered to metal is peeled off and supplied to a mechanical separator 5. Thus, the metal 6 and the slag 7 are separated and the metal 6, is recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recovering metal using aluminum alloy molten slag.

[Prior Art] Molten slag generated during aluminum alloy melting is a mixture of molten metal, oxides, lining materials, solvents, etc., and is cooled and solidified before being carried out.

However, since this molten slab contains valuable aluminum alloy ingots, various improvements have been made to collect and recycle them separately from slag.

Conventionally, this type of metal recovery method using aluminum alloy molten slag involves removing large lumps of aluminum alloy pieces from the molten slag, and then feeding them to a grinder such as a rod mill to grind them and separate them into metal and slag. They were trying to recover the bullion.

FIG. 2 shows the structure of the conventional metal recovery method using molten aluminum alloy slag. In Figure 2,
1 is a melted slag, 2 is a feeder, 3 is a rod mill,
5 is a sieving machine. The molten slag 1 is supplied to the rod mill 3 by the supply vs2, and the molten slag 1 is ground by the rolling action of the grinding medium in the rod mill 3 to obtain the ground molten slag 4. At this stage, preferential grinding is performed, and the slag is ground preferentially compared to the base metal, so the slag attached to the base metal is gradually peeled off and separated into individual pieces as the grinding progresses. Then, the state changes to a collective state of both. Also, when comparing the particle sizes of the two, slag is finer than base metal.

Next, the ground and dissolved slag 4 is sieved and fed to a machine 5.
The product on the sieve is sorted and separated as a base metal 6, and the product under the sieve is separated as a slag 7, and the base metal 6 from the dissolved slag 1 can be recovered.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional metal recovery method using aluminum alloy molten slag, a rod mill is used as an attritor, so when rolling operation is performed, each rod is Gaps are formed in the contact area, and the slag is not sufficiently ground and is discharged without being made into fine particles. In such ground and dissolved slag, the metal must be recovered and remelted by sieving G-J with a relatively coarse particle size in a sieving machine, which reduces the effectiveness of sorting and separation. Significantly, valuable fine metals are mixed into the slag. Furthermore, during grinding, the rolling action of the rod tends to spread the ductile metal, which increases impurities due to the inclusion of slag, which not only reduces recovery efficiency but also causes problems during grinding. There was a problem in that it required a high grinding tool.

The present invention solves these conventional problems,
The object of the present invention is to provide an excellent method for recovering ingots using aluminum alloy molten slag, which can recover even minute ingots, improve recovery efficiency, and grind with low grinding power.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a manufacturing method for obtaining a base metal by supplying molten slag generated during aluminum alloy melting to a grinder. The slag is put into the gap between the grinding members consisting of the table and rollers of a vertical grinder, and priority grinding is performed so that the slag is stagnated in the grinding gap from the top surface of the table to separate the metal and the slag. This is what I did.

[Function] The present invention has the following effects due to the above configuration. That is, the molten slag is put into the gap between the grinding members of the vertical grinder, which consists of the table and rollers, and is forced into the grinding gap from the top of the table under pressure to be preferentially ground. By doing so, grinding is promoted and even fine metal can be recovered, thereby improving the recovery efficiency and reducing the grinding power.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic block diagram of a method for recovering metal using aluminum alloy molten slag according to the present invention.

In FIG. 1, 1 is a melted slag, 2 is a feeder,
10 each indicates a vertical grinder. The vertical grinder 10 has a table 15 as a grinding member and a plurality of rollers 11. The narrowest part of both surfaces of the table 15 and the plurality of rollers 11 forms a grinding gap 14, and the table 15 and the plurality of rollers 11 form a grinding gap 14. 15 is rotationally driven around a vertical axis by a drive device 17 via a speed reducer 16, while a plurality of rollers 11
2 applies a pressing force in a swingable manner.

In addition, a supply pipe 13 is provided at a location located in the center of the cage, and a supply I! Connected to 12. Therefore, in the above embodiment, the molten slag 1 is introduced into the grinding gap 14 from the lower opening 13a of the supply pipe 13, and the table 5
Due to the biting motion by the O-ra 11, the molten slag 1 is compressed, crushed, and l! The throughput of the feeder 2 and the rotation speed of the table 5 are adjusted so that the powder is rubbed and discharged from the opening 18, but is stagnated in the grinding gap 14 in the concave conduit on the periphery from the top surface of the table 5. By suppressing the discharge from the opening 18 and avoiding an increase in the filling/v state of the molten slag 1, grinding between the molten slags 1 is promoted, preferential grinding is performed, and the slag becomes smaller than the base metal. Since the slag adhering to the base metal is ground preferentially during the grinding process, the slag is gradually peeled off and separated into individual pieces, and the two form an aggregate state, and the slag is refined. Next, the ground and dissolved slag 4 is passed through a mechanical lever 5.
Coarse grain products are sorted and classified as ingot 6 and fine grain products as slag 7, and the melted slag 1 becomes ingot 6.
can be recovered. The table below shows a comparison of the data obtained from the experimental examples based on the above-mentioned Examples and the data obtained by grinding using a [Tsurador].

As can be seen from the data in the table above, the method according to the present invention can recover even the finest ingots, improving recovery efficiency, and the bulk specific gravity of the ingots is also large, preventing the contamination of slag and impurities. It was found that a small amount of good quality metal could be recovered, and the power required for grinding was much less than when using other grinders, thus reducing manufacturing costs.

It should be noted that the aspect of the vertical grinder used in the present invention is of course not limited to that of the above-mentioned embodiments, and the mechanical part may be replaced with a pallet for sorting and classification, and means such as a sieve may be used for sieving. There is no problem.

[Effects of the Invention] As is clear from the above embodiments, the present invention is characterized in that molten slag is charged into the gap between the grinding members of a vertical grinder, and is preferentially ground so that it stagnates in the grinding gap from the top surface of the table. As a result, individual pieces can be separated, and even the finest metal can be recovered, improving recovery efficiency and good quality metal can be recovered.Furthermore, less power is required for grinding, which has other effects. It's a huge amount.

[Brief explanation of the drawing]

FIG. 1 is a schematic flow diagram of a metal recovery method using aluminum alloy molten slag according to an embodiment of the present invention, and FIG. 2 is a schematic flow diagram of a conventional metal recovery method. 1...Dissolved slag 6...Basic metal A...Slag 10...Vertical grinder 11...Roller
14...For grinding gap Request person Kawasaki Heavy Industries, Ltd. Figure 1

Claims (1)

[Claims] In a manufacturing method in which metal is obtained by supplying molten slag generated during aluminum alloy melting to a grinder, the molten slag is introduced into the gap between the grinding members consisting of the table and rollers of a vertical grinder, and the molten slag is fed from the top surface of the table. A method for recovering ingots using molten aluminum alloy slag, characterized in that preferential grinding is performed so that the ingots are stagnated in the grinding gaps, and the ingots and slag are separated.