JPH024659B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of 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 contains oxides, lining materials,
The slag is mixed with molten solvent, etc., and is cooled and solidified before being transported. However, since this molten slag contains valuable aluminum alloy metal, various improvements have been made to separate it from slag and recover and recycle it. Conventionally, in this type of metal recovery method using aluminum alloy molten slag, large lumps of aluminum alloy pieces are removed from the molten slag, and then fed to a grinder such as a rod mill to be ground and separated into metal and slag. They were trying to collect the bullion. FIG. 2 shows the structure of the conventional metal recovery method using molten aluminum alloy slag. In FIG. 2, 1 is a molten slag, 2 is a feeder, 3 is a rod mill, and 5 is a sieve machine. The molten slag 1 is supplied to a rod mill 3 by a feeder 2, and the molten slag 1 is ground by the rolling action of a grinding medium in the rod mill 3, thereby obtaining a 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. Furthermore, when comparing the particle sizes of the two, slag is finer than base metal. Next, the ground dissolved slag 4 is supplied to a sieving machine 5, and the products on the sieve are separated as ingots 6, and the products under the sieve are separated as slag 7. can. [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 a grinder, 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. Such ground and dissolved slag must be sieved with a relatively coarse particle size in a sieving machine to recover the metal and remelt it, so the effectiveness of sorting and separation is significantly reduced, and valuable fine particles are lost. Bullion gets mixed into the slag. Furthermore, during grinding, the rolling action of the rods 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 that high grinding power was required. The present invention solves these conventional problems, and uses superior aluminum alloy molten slag that can recover even the finest ingots, improve recovery efficiency, and grind with low grinding power. The purpose is to provide a method for recovering bullion. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a manufacturing method for obtaining ingots by supplying molten slag generated during aluminum alloy melting to a grinder, in which the molten slag is The molten slag is introduced into the grinding gap formed by the table and rollers in a concave conduit provided around the periphery of the table from the lower opening of the supply pipe for the molten slag, which is provided approximately at the center of the table and rollers of the vertical grinder. , After performing preferential grinding so that it is stagnated in the grinding gap from the top surface of the table and discharging the ground molten slag from the outer periphery of the table, the ground molten slag is separated into metal and slag by classification. It was designed to do so. [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, it is possible to accelerate the grinding process, recover even the finest ingots, improve the recovery efficiency, and reduce the grinding power. Furthermore, since the molten slag is not forced to flow by blowing air from the outer periphery of the table, the blowing power can also be reduced. [Example] Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a schematic block diagram showing a method for recovering metal using aluminum alloy molten slag according to the present invention. In FIG. 1, 1 is a molten slag, 2 is a feeder, and 10 is a vertical grinder. The vertical grinder 10 has a table 15 as a grinding member and a plurality of rollers 11, and the narrowest parts of both surfaces of the table 15 and the plurality of rollers 11 form a grinding gap 14, and the table 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. Further, a supply pipe 13 is provided at a location located approximately in the center, and is connected to the supply machine 2. 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 molten slag 1 is compressed and crushed by the biting motion by the table 15 and the rollers 11. , an opening 18 provided on the outer periphery of the table 15
The throughput of the feeder 2 and the table 1 are discharged from the table 15 so that the throughput of the feeder 2 and the table 1
By adjusting the rotation speed of 5, discharge from the opening 18 is suppressed, and the filling state of the molten slag 1 is increased, grinding between the molten slags 1 is promoted, preferential grinding is performed, and the slag is Since the slag attached to the base metal is ground preferentially compared to the base metal, the slag attached to the base metal is gradually peeled off and separated into individual units during the above-mentioned grinding process, and an aggregate state of both is formed, and the slag becomes finer. will be held. The ground molten slag 4 is then supplied to a mechanical separator 5,
Coarse grain products are sorted and classified as ingots 6 and fine grain products as slag 7, and the ingots 6 can be recovered as dissolved slag 1. The table below shows a comparison of data from experimental examples based on the above examples and data obtained by grinding using a rod mill.

〔Effect of the invention〕

As is clear from the above embodiments, the present invention involves introducing molten slag into the gap between the grinding members of a vertical grinder,
By grinding preferentially so that the metal is stagnated in the grinding gap from the top surface of the table, single pieces are separated, and even fine metal can be recovered, improving recovery efficiency and recovering good quality metal. In addition, the power required for grinding is small, and since the blowing of air into the vertical grinder is eliminated, the blowing power can also be reduced, which has great effects.

[Brief explanation of drawings]

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...Bullion, 7...Slag, 10
... Vertical grinder, 11... Roller, 14... Grinding gap.

Claims (1)

[Claims] 1. A manufacturing method for obtaining metal by supplying molten slag generated during melting of an aluminum alloy to a grinder, in which the molten slag is fed to a molten slag installed approximately in the center of the table and rollers of a vertical grinder. The material is fed from the lower opening of the supply pipe into the grinding gap formed by the table and the rollers in the concave conduit provided at the periphery of the table, and priority grinding is performed so that the material is stagnated in the grinding gap from the top surface of the table. A method for recovering ingots using aluminum alloy molten slag, characterized in that after the ground molten slag is discharged from the outer periphery of the table, the ground molten slag is separated into bullion and slag by classification.