JPS61257433A - Treatment of furnace slag - Google Patents

Abstract

PURPOSE:To recover an Fe matter contained in furnace slag and to utilize a residual part effectively as an aggregate, by treating various filtered slag contg. Fe matter in plural stages using a sieve apparatus, pulverizing apparatus and magnetic separator, etc. CONSTITUTION:Since Fe matter is contained in furnace slag discharged from a blast furnace, converter, electric furnace, etc., at first, >=500mm large lumps are separated by rotary sieve in the first process, and <=500mm small lumps are supplied to the second process. In this case, furnace slag is treated by 150mm vibration sieve, primary metal contg. 60-80% Fe is recovered from slag on sieve by magnetic separator, residual slag and slag under sieve are transferred to the third process and crushed secondarily, then separated to a secondary metal and furnace slag by utilizing vibration sieve and magnetic separator in the fourth process. Next, furnace slag is milled to the third metal by rod mill in the fifth stage, further separated to the fourth metal and primary intermediate metal by similar apparatus also in the sixth stage, at last, separated to crude refined ore and secondary intermediate metal and these are separated to refined ore contg. much Fe matter and a part contg. low Fe matter utilized as aggregate, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for treating various furnace slags produced in iron and steel manufacturing processes, for recovering concentrates having a high iron content.

[Conventional technology] Most of the blast furnace slag, converter slag, electric furnace slag, etc. generated in the iron and steel manufacturing processes were disposed of by dumping. The iron content is recovered and the slag is used as aggregate. This is the crushing of furnace slag,
We decided to carry out operations such as magnetic sorting and sieving.
Concentrates with high iron content are separated and recovered and used as concentrates and aggregates for iron and steel manufacturing. In order to increase the iron content in iron and steelmaking concentrates, efforts have been made to coarsely crack or transform the rough furnace slag using a rough splitter, and to grind the ore using a rod mill, ball mill, or autogenous grinding mill. As an example of these conventional techniques, Japanese Patent Publication No. 51-3304
No. 7, JP-A-51-147416, JP-A-51-15
There are patent applications such as Japanese Patent Application No. 59-2319, as well as those described in various publications such as No. 1615 and JP-A-52-33163@.

Each weighing furnace slag (311) produced during the iron and steel manufacturing process is usually confined to one location within the premises and is stored in multiple stages, or stored for use in less than 4 units, and is dispersed to several remote locations. ”: Equipment that processes furnace slag.
In this case, a 119-type headset installed at machine foundation-1 was used.

[Problems that the invention attempts to solve] When using a fixed type device for processing slag, it requires a vast area of 4 square meters, and it is difficult to process the slag from the slag storage area. It is necessary to transport the slag to the equipment, especially when transporting ceiling-hanging slag from a remote slag storage location to the slag processing equipment, the excavation and loading of the slag is necessary. First, there are problems such as difficulty in transportation and a decline in efficiency as the transportation distance increases. In addition, the furnace slag processing I
Although complex step-by-step operations including transportation, storage, etc. are required, it is possible to improve the slag quality and the characteristics and operation of operating equipment by effectively combining equipment that corresponds to the conditions. Processing] There was a problem in that the second step had to be simplified.

The present invention facilitates the transportation work of furnace slag, and the furnace slag processing 1]
It is an object of the present invention to provide a method for treating furnace slag that can simplify the processing of culms.

``Means for Solving the Problems'' The method for treating furnace slag according to the present invention to solve the above-mentioned problems includes a first step of removing large lumps from the coarse furnace slag using a movable device carrying 1 i of rotary sieves. and a second step of separating the primary ingot, primary coarse ore, and intermediate minerals by a movable device equipped with a vibrating sieve 1li1 separator and a phase splitter, and a movable device equipped with a crusher. The 3rd step of crushing into secondary coarse minerals, the 4th step of separating the secondary ingots and slag using a movable device equipped with a vibrating sieve and an I1 separator, and a rod mill. A fifth process in which the ingot is crushed into tertiary ingot by a movable device equipped with a vibrating sieve rod mill, and a sixth process in which the ingot is separated into a quaternary ingot and a primary intermediate ingot by a movable device equipped with a vibrating sieve rod mill. A movable device equipped with a vibrating sieve and a ball mill separates coarse concentrate and secondary intermediate metal into 1 lll.
l Covering No. 7 King Culm J: It is characterized by recovering concentrate with a high iron content from various furnace slags produced in the Rinaru iron and steel manufacturing process.

[Function] The function of the furnace slag processing method according to the present invention is that various furnace slags generated in the iron and steel manufacturing processes are treated in the first to seventh steps and the final refining step, thereby reducing iron content. Collecting high-rate concentrates and refined gold, W! It is used as concentrate for J iron and steel manufacturing. In the above process, the slag is separated, so the furnace slag is reused as an aggregate resource.

In addition, the equipment used in the 1st to 7th steps and part of the final process is mounted on movable equipment and moved to the vicinity of the slag storage area, which is effective for slag treatment operations. At that location, these devices will be interconnected to perform continuous furnace slag processing operations.

[Example] Embodiments of the present invention will be explained with reference to the drawings, focusing on the front shaft.

Figures 1 and 2 show the furnace slag processing operations, respectively. In detail, Figure 1 shows the steps from the first step to the fourth step, and FIG. 2 shows the steps from the fifth step to the seventh step. It shows the process up to the final process.

In the first king culm 10, the rotary sieve 1 is placed on the moving table ￥15.
4, a receiving tank 12, and a feeder 13 are installed, and first, rough furnace slag 11 with a size of 300 to 500 m or more such as blast furnace slag, converter slag, electric furnace slag, etc. generated in the iron and steel manufacturing process is loaded. is supplied to the rotary sieve 14 from the receiving tank 12 via the feeder 13, and the 500 yen mixed in the rough furnace slag 11 is
The large lumps 16 with a size of 1 mm or more are removed, and the rough furnace slag 11 with a size of 500 mm or less, which does not include the large lumps 16, is made into a furnace slag 21.
It is supplied to the downstream culm, which is the second process.

Processing the rough furnace slag 11 in which large lumps 16 are still mixed not only makes it difficult to operate related equipment such as crushing equipment and magnetic separator, but also makes it difficult to improve the separation efficiency to improve the iron content. There is a risk that additional operations may be required as the

In the second T step 20, a vibrating sieve 22, a magnetic separator 24, and a coarse splitter 23 are mounted on the moving table jl125-11, and the first
Receive the furnace slag 21 from T stage 10 and pass it through the vibrating sieve 22:
It's so hot! sieve ore with dimensions of iomm or more and 1! i 0 m
The sieve ore is separated into the sieve ore of less than 1.0 m in size, and the sieve ore is further subjected to magnetic separation using magnetic separation Ia 24 to reduce the iron content to 60, and the primary ingot 26 with an iron content of 80% or more. 60-80
% or less of the furnace slag. This furnace slag is supplied to the rough splitter 23 and compressed force is applied to cause rough splitting or deformation!
A primary phase expansion 27 is performed with the dimensions reduced to 150 mm or less, and at this point, metal and mineral substances such as slag are partially separated. The undersieve ore of the vibrating sieve 22 is processed into the fourth step 50 as an intermediate ore 28 having a small size and a high slag content.
sent to.

Next, 30 is a magnetic separator conveyor and has a magnetic separator 31, which performs magnetic separation during the transportation process to the next step of the next phase expansion 27, so that the iron content is 80 to 90%. The primary bullion 32 is sent to the fifth process, and - the next bullion 3
The primary rough expansion 41 from which 2 is separated is sent to a third step 40.

In the third step, a crusher 42, such as a rotary crusher, is mounted on a moving cart 43, and a magnetic separation conveyor 3
The primary rough expansion 41 from 0 is received, supplied to the crusher 42, crushed by applying compressive force, and the secondary rough expansion 44 whose dimensions are reduced to 80 mm or less is processed. Partial separation with mineral materials such as slag is further promoted. The secondary phase expansion 44 is subsequently sent to a fourth step 50.

In the fourth stage 50, a vibrating sieve 51 is placed on a moving cart 55.
, a conveyor 53, a magnetic separator 52, a shaker 1111 sieve 54 are connected and installed, and the secondary rough opening 44 from the third culm 40 is installed.
Then, the intermediate ore 28 from the second T culm 20 is received and subjected to sieving (J:) sorting and magnetic sorting to reduce the iron content to 80.
~90% secondary metal 57 and slag mainly composed of minerals 58
and a vibrating sieve 51 with a size of 50 mm or more. The properties of the monthly supply to the vibrating sieve 54 are essentially only mineral substances, and the sieve fraction IJ is classified by J:
Slags 58b and 30 with dimensions of 50 to 301run
The slag 58a has a size of ~5 mm and the slag 58 has a size of 5~Os.

In the fifth step 60, the feeder 61 is placed on the moving cart 63.
, a rod mill 62 is connected and installed, and the rod mill 62 accepts the primary ingot 26 from the second machine, the next ingot 32J3, and the secondary ingot 57 from the fourth process, and crushes it in the rod mill 62. By doing this, a tertiary ingot 64 with an iron content of 60 to 80% and reduced to 200 mm or less is obtained.

In the sixth step, the vibrating sieve 11 is placed on the moving cart 74-hi.
It has a feeder 72 and a mill 73 connected to it,
The tertiary metal 64 from the fifth step 60 is received and passed through the vibrating sieve 7.
According to 1, sieved metal with dimensions of 50 mm or more and 50 to 10
The sieved ingots are separated into sieve intermediate ingots with dimensions of mm and under-sieve ingots with dimensions of 10 mm or less. Gold 7
Get 5. The sieved intermediate metal is taken out from a part of the feeder 72 and is separated into slag 78a and a primary intermediate metal 79a having an iron content of 90 to 98% by magnetic separation during transportation on a magnetic separation conveyor a. The sieve base metal is the primary intermediate metal 76, and r! By performing magnetic separation during the transportation process on the im conveyor 77, the slag 78 and the primary intermediate metal 19 having an iron content of 90 to 98% are separated. 5th■
In the culm and the sixth step, the separation process between the slag and the primary intermediate metal is promoted, and the iron content of the foam intermediate metal 79.79a increases.

In the 7th King's Step 80, a vibrating sieve 81 is placed on a moving cart 84.
, a feeder 82, and a ball mill 83 are connected and mounted, and receive the quaternary ingot 75 and the primary intermediate ingot 79 from the sixth step 70, and pass them through the vibrating sieve 81. The sieved material is sorted into the base metal, and the sieved metal is supplied to a ball mill 83 where it is pulverized and the coarse concentrate 85 reduced to 1 mm or less is reduced to 1 mm.
11. The sieve base metal is classified as a secondary intermediate metal 86 having a size of 2 mm or 5 mm or more in vA selection competition 17.
In the transportation process of 87, magnetic separation is performed to separate the slag 89a and refined gold 88a with an iron content of 90 and 98%. In addition, in the refining process for further improving the purification of the seventh king culm 80, a vibrating sieve 81a is provided on the movable cart 84a, and the coarse concentrate 85 is received and sieved by the vibrating sieve 81a. () The bottom of the sieve is separated as slag 89, and the top of the sieve is separated with a concentrate 88 having a size of 1# or more.The coarse concentrate 85 is already separated from the slag and the single substance 1111I L,
In the refining process, 1 q of concentrate 88 with an iron content of 90 to 98% is obtained only by sieving.

In this way, 88 J of concentrate with high iron content was extracted from the crude furnace slag 11.
:Refined gold 88a was recovered at the iron and steelmaking concentrate doji,
In addition, slag 58.58a, 58b,
78° 78a and 89, 89a are divided into respective size ranges. Therefore, it is possible to add operations such as blending, etc., and use it as is, such as in the previous month for civil engineering.

[Effects of the invention: According to the method for treating furnace slag according to the present invention, furnace slag treatment]:
The slag processing equipment used for main operations such as culm crushing, magnetic separation, and sieve sorting is mounted on movable equipment, and there is a slag storage area that is effective for slag processing operations. By moving the furnace slag to a nearby location, interconnecting these devices at that location, and performing continuous slag processing operations, it is possible to greatly facilitate the transportation of the furnace slag. In addition, the movable cart is equipped with slag processing equipment connected to each tower within a limited space, making it possible to process slag in an extremely narrow space. The process can be simplified because the effective equipment combination can be easily changed depending on the condition of the furnace slag quality.

[Brief explanation of drawings]

FIGS. 1 and 2 are process diagrams showing a furnace slag treatment method according to an embodiment of the present invention.

Claims (1)

[Claims] The first step is to remove large lumps from the rough furnace slag using a movable device equipped with a rotating sieve, and to separate primary ingots and primary rough cracked ore by a movable device equipped with a vibrating sieve, a magnetic separator, and a rough splitter. The second step is to separate into intermediate ore, the third step is to crush into primary coarse ore by a movable device equipped with a crusher, and the secondary step is to crush into primary coarse ore by a movable device equipped with a vibrating sieve and a magnetic separator. A fourth step of separating the slag into slag, a fifth step of crushing into tertiary ingots using a movable device equipped with a rod mill, and a fourth step of crushing into tertiary ingots using a movable device equipped with a vibrating sieve and a rod mill. The iron content is determined from various furnace slags produced in the iron and steel manufacturing process, which consists of the sixth step of separating into coarse concentrate and secondary intermediate ingot using a movable device equipped with a vibrating screen and a ball mill. A furnace slag processing method characterized by recovering concentrate with a high concentration.