JPS6034753A - Treatment of slag generated from iron producing plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention recovers high-grade metal from slag generated from blast furnaces and steelmaking furnaces in steel plants, and the residue other than the metal is used for ballast or other purposes. This relates to a slag processing method that divides slag into sizes.

Various types of slag were previously thought to be used for landfill or as a type of waste, but since they contain a considerable amount of metal, in recent years, the metal has been recovered and the residue has been effectively utilized. It is thought that this can be done, and various methods are used to treat it. Although this process can be divided into many methods in detail, it is generally done by a combination of crushing, sieving, and magnetic separation, and is specialized depending on the size of the target object, the bullion content, the size of the recovered material, etc. Disadvantages include that many crushers and magnetic separators must be installed, requiring a large processing area and a large amount of equipment cost, and that the operating efficiency of these machines is low. was there.

In the present invention, the crusher used is multifunctional, and all crushing and grinding are performed with this single crusher, and the magnetic separator is also used multiple times, that is, raw materials of different sizes are passed through almost the same process, and the same It was designed to improve the above-mentioned shortcomings by sharing the same equipment as the magnetic separator, and its major feature is that it has a large number of intermediate discharge holes of the required diameter in the circumferential body.
Using a mill that has a lid that can be opened and closed, and that allows air to be drawn out from the final discharge port at one end,
This means that this mill will be used three times, each with a different function.

The multifunctional mill used in the present invention is one in which rods or balls serving as a crushing medium are inserted, and usually a so-called rod mill in which rods are inserted is used.

The method of the present application will be described in detail below with reference to the drawings showing one embodiment thereof.

FIG. 1 schematically shows an apparatus for carrying out the method of the present invention,
Also, Figure 2 shows the same flow sheet, and Figures 1 and 2 show the same flow sheet.
As shown in the figure, the raw material slag S is first grizzly (
Collect the large bullion according to step 1), and put the unsifted material from the grizzly mill into the mill (2).

As shown in FIGS. 3 to 6, this mill (2) has a large number of intermediate discharge holes (1
01) is opened, and a lid (102) that can be opened and closed is attached to the intermediate discharge hole (101). Also, one end of the mill body (100) is a raw material supply port +1031, from which raw materials are supplied by a feeder (104), etc., and finally the final discharge port +1031 is provided at the other end of the mill body.
The final discharge port (105), which is taken out from the mill 105+, is also equipped with a lid (106) for opening and closing it, and can be opened and closed separately from the lid (102) of the intermediate discharge hole (101). These opening/closing lids are normally opened and closed using hydraulic cylinders, but are not limited to hydraulic cylinders and may be driven by other known driving means. Furthermore, the mill (2) used in the present invention has a suction duct (108) arranged to face the opening at one end (103) or, in some cases, the opening at the other end (1071). It is constructed in such a way that the fine air and particles generated inside can be drawn out.

In Figures 3 and 4, (109) is the crushing medium rod, +110 is the mill main body (raw material supply port (1001)
This is an initial opening provided in the circumferential body near 31, and this initial opening (110) is for removing fine particles contained in the supplied raw material to the outside of the mill (2) for polishing at an early stage. Break,
It is intended to increase crushing efficiency, and its diameter is as large as that of the intermediate discharge hole (101), and is also provided with a lid (111) that can be opened and closed. Also in the figure +
Reference numeral 1121 is a feeder for feeding ore used when feeding ore from the other end opening (107) side.

f:) Figures 5 and 6 show an example of the opening on the ore feeding side, and as shown in these figures, the ore feeder + 104) hood covering the top + 113) the tip The feeder (104) is suspended by a hanging rope (114), and the base end of the feeder (104) is supported by a pivot (1151), and the hood (114) is suspended as shown in FIG.
3) can be removed from the top of the feeder (114), and the hood (114) is removed only when charging fine raw materials in the
3) through the hopper (116) attached to the
Outside of that 9, feed directly without going through the hood (113) +
The raw material is dropped onto 1041.

The unsieved material of Grizzly (1) (in this example, 1300 mm1) was placed in the mill (2) as described above, and the opening diameter was 25 mm.
The mill is operated with the intermediate discharge hole 0 and the final discharge port open, and the material discharged from the same width discharge hole and the residue inside the mill are separated. In the case of B, as the mill is driven, the raw material inside the mill is ground and crushed to generate fine particles, but the fine particles are discharged from the mill through the intermediate discharge hole each time, so they are ground.

Currently, the diameter of the intermediate discharge hole is 10 to 10 mm, which has good crushing efficiency, and depends on the iron grade and the size required when using the remaining iron metal recovered from the raw material slag for ballasting or other purposes.
30 gardens, usually 25ffIIn.

As mentioned above, the material discharged from the intermediate discharge hole after the first treatment by the mill (2) is then passed through the magnetic machine (3), where the magnetic material is used as a primary intermediate product, and the non-magnetic material is treated as tailings. It is sent to the ore hopper (4), while the discharged material from the final discharge port is passed through a magnetic separator (5) which is different from the magnetic separator (3) to convert the magnetic material into a primary product, and the 11° magnetic material is returned to the raw material. Next, the above-mentioned products were put into the same mill (2) as used earlier, and this time the mill (2) was driven with the intermediate discharge hole closed, where they were ground and crushed. The entire amount of material is passed through another magnetic separator (6), and the non-magnetic material at this time is treated as tailings and sent to the tailings hopper (4).
In this example, the product is passed through a 5 mm filter (7) and the product on the sieve is used as a secondary product, while the product on the sieve is used as a secondary intermediate product and sent to the next step. Next, this secondary intermediate product usually has a certain amount of water agglomerated (because it is a fine grain), so after drying it with an 8-ton dryer, it is put into the same mill (2) as described above (third time). .

Note that if the moisture content of this secondary intermediate product is 5% or less, it may be processed without passing it through a dryer.

This is because most of the moisture on the fine powder side Cζ that is suctioned is transferred due to the air sep type.

In this third case, the mill (2) is driven while the intermediate discharge hole is closed and air is sucked in from one opening so that the flow of the feed material and the air flow are countercurrent. At this time, the fine particles drawn out together with air are passed through a magnetic separator (9), and the magnetized materials are made into concentrate powder products, while the non-magnetic materials are transferred to the tailings hopper (4), while the mill (2)
) is taken out continuously from the second mill (2
) Immediately after use, the magnetic separator (6) is used again to turn the magnetic material into a tertiary product, and the non-magnetic material is processed into tailings/F-(
4).

In Figure 1, (1o) is the raw material yard, (11) is the apron feeder, (12) is the −th intermediate product hover, and +
131 is the secondary intermediate product hopper, +141: More output
+15) indicates the concentrate powder product Holaper, and +161 indicates the product Popper. In addition, the numbers in the frame in Figure 2 are 2 years. represent non-magnetic objects, respectively. The test conditions that yielded the results shown in Figure 2 were as follows:
The mill body is 760 or 860 mm in size, and there are 7
Load the rods of 0 + × 80 OB so that the space factor becomes 20% and rotate at 30 rpm, and the flow velocity of the air inside the mill body is 10 m/sec for iron making slag and 12 m/sec for 151 IC1l collar slag. The mill was driven while flowing air through Naro-sama. Figures 5 and 6 are graphs that clarify the effect of air classification in this step (2). This figure shows the iron quality and grain size division 41j with and without cases.

As mentioned above, according to the method of the present invention, one mill can be used three times by varying the usage time and effectively using various attachments (opening/closing lid, etc.).
Fewer mills are required to be prepared, which naturally requires less space for installation, and recovery of metal from the raw material slag can be carried out with high efficiency, as is clear from the quantity balance table in Figure 2. In the third use of the mill, air classification is performed, so fine particles (2 to 2
It has many advantages, such as the ability to easily and quickly improve the quality of ingots (approximately +n11 to +0.3+nm), and in the case of parentheses, it is possible to process even if there is about 5% moisture in the raw material.

Furthermore, the remaining material after recovering the bullion can be effectively used as ballast, raw material for cement, etc.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram of the apparatus for carrying out the present invention, Figure 2
8 is a flow sheet of one embodiment of the present invention. Fig. 3 is an explanatory cross-sectional view of the mill used in the present invention, Fig. 4 is an explanatory open cross-sectional view, and Figs. 5 and 6 are explanatory views of essential parts showing an example of the structure of the raw material feeding side of the mill, respectively. , Fig. 7 and Fig. 8 respectively show the effects of air classification in the present invention section ■ process of ironmaking slag and! ! ! Graph showing data about steel slag. Patent applicant Noriharu Ariyoshi, representative of Nippon Magnetic Separation Co., Ltd.

Claims (1)

[Claims] 1. A method for treating slag generated at a steelworks, which comprises the following steps. Step (2): After coarse crushing, the slag from which large ingots have been removed is put into a horizontal mill that has a 10-39 mm intermediate discharge hole that can be opened and closed in the circumferential body and a final discharge port that can be opened and closed at the end. Open the discharge hole and final discharge port to perform crushing. 2nd process: The material discharged from the intermediate discharge hole in the 1st process is magnetically separated, the magnetic material is sent to the next process as a primary intermediate product, and the non-magnetic material is stored in the tailings hopper. The material discharged from the outlet (after that, it is subjected to magnetic separation, and the magnetic material is made into a primary product, and the non-magnetic material is returned to the first step. The mill was then put into the same mill again, the intermediate discharge hole of the mill was closed and the final discharge port was opened, and the material discharged from the final discharge port was subjected to magnetic separation. ~7 The sieved material is used as a secondary product, and the sieved material is sent to the next process as a secondary intermediate product. The magnetized material is stored in the tailings hopper. Step ■: The secondary intermediate product from Step ■ is placed three times in the same mill used in Steps 1 and 2, and the intermediate discharge from the mill is carried out. Close the hole, open the final discharge port, and suck out the fine particles together with air from the opening at one end.The fine particles are magnetically separated, and the magnetic substances are made into concentrate powder products.The non-magnetic substances are treated as tailings, such as tailings and buckwheat. On the other hand, materials other than the above-mentioned fine particles are continuously discharged from the final discharge port and passed through the same magnetic separator as in step ① above, and the magnetic materials are treated as tertiary products, while the non-magnetic materials are stored as tailings in the tailings hopper. to be stored.