JPS61276943A - Treatment of furnace slag - Google Patents

Abstract

PURPOSE:To facilitate the transportation operation of furnace slag and to simplify considerably a treatment stage for the furnace slag by using a treatment device for the furnace slag of a moving type to recover the concentrate contg. iron at a high rate from various kinds of the furnace slag generated in the process for iron and steel making by disintegrating, screening, etc. CONSTITUTION:The crude furnace slag 11 is screened by a trommel 14 on a moving carriage 15 and large lumps are removed therefrom in the 1st stage 10. The balance is supplied to a crusher 24 on a moving carriage 25 and is crushed to obtain simultaneously the intermediate slag 26, 27 having large and small sizes in the 2nd stage. The slag 26, 27 are respectively magnetically separated to obtain the concentrate 32 having the extremely high content of the iron-component and the intermediate ore 32a having the high content of the iron-component. The ore 32a is supplied to the former of a rod mill 42 and vibrating screen 45 on a moving carriage 48 and is disintegrated. The disintegrated ore is divided to the plus sieve ore (crude concentrate 46) and minus sieve ore (intermediate ore 47) by the screen 45. Both are respectively magnetically separated so that the concentrate 52 having the extremely high content of the iron- component and the intermediate concentrate 52a having the high content of the iron- component are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for treating various furnace slags produced in the iron and steel manufacturing process 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. Iron content is recovered and the slag is used as aggregate. This is the crushing of furnace slag,
Magnetic separation and sieving are performed to separate and recover concentrates with high iron content through operations such as sorting, and are used as concentrates and aggregates for iron and steel manufacturing. In order to increase the iron content in concentrate for iron and steel manufacturing, efforts have been made to coarsely crack or deform the rough furnace slag using a rough cutter, and to grind the ore using a rod mill, ball mill, or autogenous grinding mill.

Examples of these conventional techniques include Japanese Patent Publication No. 51-33047, Japanese Patent Application Publication No. 147416/1982, and Japanese Patent Application Publication No. 51-1516.
There are patent applications such as Japanese Patent Application No. 59-2319, as well as those described in various publications such as No. 15@ and Japanese Patent Application Laid-Open No. 52-33168.

The various types of furnace slag generated during the iron and steel manufacturing processes are normally dumped in one location on the premises, and are not stored for use, but instead are dispersed to several remote locations. . In addition, as equipment for treating furnace slag, a stationary equipment installed on the machine foundation was used.

[Problems to be Solved by the Invention] When a stationary device is used as a device for treating slag, a vast area is required, and the slag must be transported from the slag storage area to the slag processing equipment. In particular, when transporting human slag from a remote slag storage site to a slag processing equipment, the distance involved in excavating and loading the slag increases as the transport distance increases. There are problems such as transportation difficulties and economic decline.

Furthermore, the furnace slag processing method requires not only main operations such as crushing, magnetic separation, and sieving of the furnace slag, but also complicated step-by-step operations including supply, weighed transportation, storage, etc. Through effective equipment combinations that correspond to improvements in slag quality and characteristics of operating equipment and operations,
There was a problem in that the furnace slag treatment process had to be simplified.

SUMMARY OF THE INVENTION The present invention aims to provide a furnace slag processing method that facilitates the transport work of furnace slag and significantly simplifies the furnace slag processing process.

[Means for Solving the Problems] The furnace slag processing method according to the present invention for solving the above problems includes a first step of removing large lumps from the rough furnace slag using a movable device equipped with a rotating sieve; The second step is to crush into intermediate furnace slag using a movable device equipped with a crusher, and the third step is to separate coarse concentrate and intermediate ore by a movable device equipped with a rod mill and a vibrating screen. This method is characterized by recovering concentrate with a high iron content from various furnace slags produced during the iron and steel manufacturing processes.

[Function] The function of the furnace slag treatment method according to the present invention is that various furnace slags generated in the iron and steel manufacturing processes can be processed from the first step to the third step, and if necessary, the fourth step, which is the final step (in this case, it is extremely simple). By processing it under a process of , steel slag is reused as an aggregate resource.
From the step to the third step and part of the fourth step (,
Each of the equipment used in the slag is mounted on a movable device, and is moved to a location near the slag storage area that is effective for slag processing operations, and at that location, these devices are easily interconnected. Continuous furnace slag processing operations will be carried out.

[Example] Embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows a furnace slag treatment process based on an embodiment of the furnace slag treatment method according to the present invention.

In the first step 10, a rotary sieve 14 is placed on a moving cart 15.
41 people accepted including ! First, various furnace slags generated in the iron and steel manufacturing process, such as blast furnace slags, converter slags, electric furnace slags, etc., are used as a raw material. , the large lumps 16 with a size of 300 mm or more mixed in the rough furnace slag 11 are removed from the receiving tank 12 via the feeder 13 to the rotary sieve 14, and the large lumps 16 excluding the large lumps 16 are removed for 300 s. Crude furnace slag 11 with the following dimensions
This is supplied as furnace slag 21 to the second and subsequent processes, which are downstream processes. Processing the rough furnace slag 11 in which large lumps 16 remain mixed not only makes it difficult to operate related equipment such as crushing equipment and magnetic separator, but also increases separation efficiency to improve iron content. may require additional operations. In the second step, the mobile cart 2
A crusher 24, a receiving tank 22, and a feeder 23 are mounted on the top of the crusher 24, which receives the furnace slag 21 from the first step 10, and the crusher 24 is equipped with a rotating cylinder that holds the crushing medium. Thus, it is possible to simultaneously obtain intermediate furnace slag 26 whose size is reduced to 40 to 75 m or 40 to 20 mm, and intermediate furnace slag 27 whose size is reduced to 40 mm or less or 20 # or less. At this time, metals are partially separated from mineral substances such as slag.

Next, 30 is a magnetic separator conveyor and has a magnetic separator 31, and the intermediate furnace slag 26 is separated into concentrate 32 and slag 33 having an iron content of 90 to 98% by performing magnetic separation during the transportation process. separated into

Similarly, 30a is a magnetic separator conveyor, and a magnetic separator 31a is used.
The intermediate furnace slag 27 has an iron content of 75 to 8 by performing magnetic separation during its transportation process.
Intermediate mirror 32a and slag 33a that reach 0% 1111
1 and the intermediate mirror 32a is sent to the third culm 40. .

43 is on the 32nd F culm 40 and the mobile trolley 48 is on JZ [1
Equipped with a tube mill 42, a vibrating sieve 45, a feeder 41, a transporter 43, and a rotary transporter 44, the magnetic separation vessel\730a
receives the intermediate mirror from and supplies it to the rod mill 42;
The crushing media is crushed in a rotating cylinder with a size of 2.
0mmA: The IC is reduced to 10mm or less, and is then supplied to the vibrating sieve 4:) by the connected transporter 43 and rotary transporter 44, and the coarse refined ore, which is sieve ore with a size of 2 mm or more, is supplied to the vibrating sieve 4:). ore 46 and intermediate mirror 47, which is sieve ore with a size of 5 mm or less.
The coarse concentrate 46 is separated into two parts, and the iron content is 90 to 98%.The iron content is 90 to 98%. It is divided into concentrate 52 and slag 53 to improve its quality. The intermediate mirror 47 is a magnetic separator conveyor p on the right side of the magnetic separator 51a.
By performing magnetic separation during the transportation process in 50a, the intermediate concentrate 52a and slag 53a having an iron content of about 80% are separated.

Furthermore, depending on the properties of the rough furnace slag 11, concentrate 52 and intermediate concentrate 52a, intermediate R+ ore 5) 2a is added as necessary.
It is possible to improve the quality of A by refining it.

In No. 60, a ball mill 62 and a feeder 61 are mounted on a movable table 63, and a vibrating sieve 71 is mounted on a movable table. Receive the intermediate concentrate 52a from the third process 40, feed it to the ball mill 62 and crush it,
At this time, the partial separation 1111 between the phase concentrate 64 and the mineral material consisting of metal and slag is further promoted. The coarse concentrate 64 is transported to a vibrating sieve 71 and is sorted by the sieve 71, the bottom of the sieve is slag 74, and the top of the sieve is 1 mm or more concentrate 7.
3 minutes 1111-Jru. In the refining process, in the refining process, the crude concentrate 64 is aggregated with the steel slag and the iron content is 9.
0.~98% concentrate 73 is produced. .

In this way, from the crude furnace slag 11, refined grains 1ii32 with a high iron content are produced.
゜52、! i2a, J: and 73 were recovered as paper for iron and steel manufacturing, and slag 33.33a was recovered as slag.
, 'a3° are classified into respective size ranges. Therefore, by increasing the mixing and other operations, it is possible to use it as it is, such as as a gravestone for wooden ashes.

[Effect of the invention 1] According to the furnace slag processing method according to the present invention, the furnace slag used for main operations such as crushing, magnetic separation, and screening of sieved C in the furnace i′+′ processing plant () Each of the processing equipment is mounted on a movable device N, which is moved to the vicinity of the slag storage station, which is effective for slag processing operations, and at that location, these 8 gases are interconnected for continuous operation. By carrying out the furnace slag treatment operation, the transportation work of the furnace slag can be made extremely easy.

Furthermore, the movable cart is equipped with slag processing equipment connected to each other within a limited space, making it possible to process slag in an extremely narrow space. Corresponding to the improved condition of furnace slag in the slag treatment process, effective <'L
Since the equipment assembly can be easily changed, the process can be significantly simplified.

[Brief explanation of the drawing]

FIG. 1A3 and FIG. 2 are J process diagrams showing a furnace slag treatment method according to an embodiment of the present invention. 10...First culm 11...Rough hearth soup 14.
...Rotating sieve 1t...Movable platform 16...Large lumps 20...Second soil stage 24...Crusher 25...Moving platform 11!26...Intermediate furnace slag
27... Intermediate furnace slag 40... Third culm 42
... Rod mill 45 ... Vibration sieve 46.
...Rough concentrate 47...Intermediate mirror 52...Concentrate 52a...Intermediate concentrate 64...Rough concentrate 7
3...Precise &1i174...Furnace slag application Person Kawasaki Heavy Industries Co., Ltd. Procedural Amendment (Method) October 1, 1985 Commissioner of the Patent Office Uga Michi 1"lh 1, Indication of the case ← 1985 Special Relationship with Permission Request 0T117257 Case
Patent applicant representative Ken Hiroshi Haseyo 4, agent Artificial Intelligence 103 /) The words "...and Figure 2..." in line a of page 70 of the same document are deleted.

Claims (1)

[Claims] A first step in which large lumps are removed from the rough slag by a movable device equipped with a rotary sieve, a second step in which the coarse slag is crushed into intermediate slag by a movable device equipped with a crusher, and a rod mill and a vibrating sieve are used. A furnace slag processing method characterized by recovering concentrate with a high iron content from various furnace slags produced in the iron and steel manufacturing process, which comprises a third step of separating coarse concentrate and intermediate ore using a movable device mounted on the furnace. .