JPS6261641B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention aims to recover high-grade ingots from slag produced from blast furnaces and steelmaking furnaces (mainly converters) in steel plants, and to convert the remaining material other than ingots into sizes suitable for the intended use. This relates to a processing method. In the past, these various types of slag were used for landfill, or large chunks of bullion were collected by hand, and most of the remaining portion was disposed of with a considerable amount of bullion still remaining. . The applicant of the present application has previously developed and implemented a method for recovering bullion from these slags by repeatedly crushing the slag with a rod mill and magnetic separation. When slag that has been repeatedly crushed becomes finer than a certain level (approximately 10 mm), it is difficult to separate the metal in the slag from other materials beyond a certain limit when crushing with a rod mill or ball mill. Whether it is magnetic separation or magnetic separation, it is more efficient to separate the metal by size, and it is also effective when the residue after separately recovering the metal is used as roadbed material, soil improvement material, or cement auxiliary raw material. I found out. Table 1 below outlines the uses of slag, its standards, and demand trends.

[Table] This application has been researched and developed to achieve the above objectives, and its gist is a method for treating slag generated from steel works, which consists of the following steps. 1st process: 25~
Sort by size by passing through a sieve with the required number of 120 mm stages, and collect the magnetic materials by passing each size group through a magnetic separator separately.The non-magnetic materials in each magnetic separator are then crushed by a crusher to separate them into smaller size groups. The process of sending the metal to a magnetic separator to collect the metal is repeated until the final non-magnetized material is approximately 25 mm or less. 1st process: Approximately 25mm inside the magnetic material obtained in the 1st process
Those with a diameter of less than
The sieved material is further passed through a magnetic separator to separate magnetic materials, and the magnetic material less than 15 mm is dried and then sieved through a 1 to 3 mm sieve. 1st step: The non-magnetic material of the 1st step and the non-magnetic material of the 1st step are separated into sizes suitable for cement auxiliary raw materials and roadbed materials. 1st step: The magnetic material obtained in the 1st step with a diameter of about 15 mm or more and the magnetic material obtained in the 1st step are ground by a rod mill for about 10 min.
The material on the sieve is passed through a mm-th sieve, and the material on the sieve is passed through a magnetic separator to recover the metal, and the material on the sieve is further 1 to 3
Pass through a mm sieve. 1st step: In the 1st step, the material on the sieve of 1 to 3 mm sieves is separated from the base metal and other parts by performing an operation of projecting objects or objects on the sieve at high speed and colliding them a required number of times. The metal is separated and the other parts are collected in steps 1 to 1 in the first process.
The material under the 3 mm sieve and the material under the sieve from the 1 to 3 mm sieves in the first step are passed through a magnetic separator to perform magnetic separation and recover the metal. It is. An embodiment of the method of the present application will be described in detail below with reference to the flow sheet shown in the drawings. The slag that becomes the raw material 1 is first collected by a sieve 2 like a Grizzly, and then 25 mm and 100 mm 100 mm or more is immediately passed through a magnetic separator 3 to recover the bullion, and the non-magnetic material is passed through a geocrusher 4 equipped with a hydraulic device to crush and simultaneously separate the bullion and other materials into single pieces. Perform separation. If there is metal mixed in that is larger than the set interval of the jaw crusher 4, the jamming phenomenon occurs and at the same time a damper linked to the hydraulic system responds.
Collect large bullion out of the system. 30 to 100 mm size items are magnetically separated together with the non-magnetic material in magnetic separator 5, then crushed in cone crusher 6, mixed with the under-sieve material of the first 25 mm sieve, and magnetically separated in magnetic separator 7. . In this case, the lower limit was set as 25 mm because a size of about 25 mm is suitable for effectively utilizing the remaining metal recovered from the slag. If it is only for the purpose of collecting gold, it is better to have a smaller size, but it will be less efficient. The number of magnetic substances magnetically separated in this way by the magnetic separator 7 is 15.
The material is sieved through a mm-th sieve 8 to recover the upper material, and the material under the sieve is passed through the magnetic separator 9 again to remove non-magnetic substances entangled in the magnetic material and improve the quality of the magnetic material itself. In this case, the non-magnetic substances are separated by use using a sieve 10. Next, moisture content in magnetic objects less than 15 mm is approximately 5 to 7 mm.
%, so it is dried in a dryer 11 to reduce the water content to about 2% or less, and then sieved with a 1 to 3 mm sieve 12.The sieved material is the magnetic material of 15 mm or more obtained in the previous step. The unsifted material is magnetically separated by a magnetic separator 13 to recover the metal. On the other hand, the magnetic material passed through the sieve 12 and the magnetic material larger than 15 mm are crushed by a rod mill 14 and separated from the base metal and other parts, and then sieved by a 10 mm sieve 15 to remove the sieved material. The ingots are recovered by passing through a magnetic separator 16, and the unsifted material is further sieved through a 2 mm sieve 17, and in this case, the sieved materials are projected onto each other or the sieved materials at high speed onto a wall, etc. Using the device 18, the operation of separating the bullion from the other parts is repeated four times,
Individual parts are separated to recover the metal, and other parts are magnetically separated by a magnetic separator 13 to recover the metal. Slag and metal when processed through the above process,
The quantitative proportions of other parts are expressed in weight percentages in the flow sheet shown in FIG. According to the method of the present invention, ingots, which are valuable components in slag, can be recovered in high quality, and the remaining residue can be effectively used as a cement auxiliary raw material or roadbed material, and the entire process is a dry process. Since this method is carried out, equipment costs are low and management is easy.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of an example of the method of the present invention.
FIG. 2 is an explanatory diagram showing the same quantitative ratio, and FIG. 3 is an illustration of the same arrangement. In the figure, 1: raw material, 2: sieving machine, 3: magnetic separator,
4: Diyo crusher, 5: Magnetic separator, 6: Corn crusher, 7: Magnetic separator, 8: 15 mm sieve, 9: Magnetic separator, 10: Sieve, 11: Dryer, 12: 1-3 mm
Eye sieve, 13: Magnetic separator, 14: Rod mill, 1
5: 10mm sieve, 16: Magnetic separator, 17: 2mm sieve, 18: Projection device.

Claims (1)

[Claims] 1. A method for treating slag generated from a steelworks, which comprises the following steps: 1st process: 25~
Sort by size by passing through a sieve with the required number of 120 mm stages, and collect the magnetic materials by passing each size group through a magnetic separator separately.The non-magnetic materials in each magnetic separator are then crushed by a crusher, and each size is one step smaller. The final non-magnetic material is about 25mm after the operation of sending the group to a magnetic separator to collect the metal.
Repeat until below. 1st process: Approximately 25mm inside the magnetic material obtained in the 1st process
Those with a diameter of less than
The sieved material is further passed through a magnetic separator to separate the magnetic substances, and the magnetic substances smaller than 15 mm are dried and then sieved through a 1 to 3 mm sieve. 1st step: The non-magnetic material of the 1st step and the non-magnetic material of the 1st step are separated into sizes suitable for cement sub-raw material roadbed material. 1st step: The magnetic material obtained in the 1st step with a diameter of about 15 mm or more and the magnetic material obtained in the 1st step are ground by a rod mill for about 10 min.
The material on the sieve is passed through a mm-th sieve, and the material on the sieve is passed through a magnetic separator to recover the metal, and the material on the sieve is further 1 to 3
Pass through a mm sieve. 1st step: In the 1st step, the material on the sieve of 1 to 3 mm sieves is separated from the base metal and other parts by performing an operation of projecting objects or objects on the sieve at high speed and colliding them a required number of times. The metal is separated and the other parts are collected from steps 1 to 1 in the first process.
The material under the 3 mm sieve and the material under the sieve from the 1 to 3 mm sieves in the first step are passed through a magnetic separator to perform magnetic separation and recover the metal.