JPH0136538B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a furnace slag treatment method for recovering concentrate with a high iron content from various furnace slags produced in iron and steel manufacturing processes.

[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 involves crushing the furnace slag, magnetic separation, sieving, and other operations to separate and recover concentrate with a high iron content, which is then used as concentrate and aggregate for iron and steel manufacturing. be. 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. Examples of these prior art techniques include:
In addition to those described in Japanese Patent Publication No. 51-33047, Japanese Patent Application Publication No. 147416, Japanese Patent Application Publication No. 51-151615, and Japanese Patent Application Publication No. 52-33163, as well as Japanese Patent Application No. 59-2319, etc. There is a patent application.

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. . Furthermore, as equipment for treating furnace slag, a stationary type 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 a large amount of slag from a remote slag storage site to a slag processing equipment, there is a need to carry out the excavation and loading of the slag, as well as transportation as the transport distance increases. There are problems such as operational difficulty and economic decline. Furthermore, the slag processing method requires not only the main operations such as crushing the slag, magnetic separation, and sieving, but also complicated step-by-step operations including supply, weighing, transportation, storage, etc. There was a problem that the furnace slag treatment process had to be simplified by an effective combination of equipment that corresponded to the improvement of the furnace slag quality as well as the characteristics and operation of the operating equipment.

SUMMARY OF THE INVENTION The present invention aims to provide a furnace slag processing method that facilitates the transport work of furnace slag and 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 separate the primary ingot, primary coarse ore, and intermediate minerals using a movable device equipped with a vibrating sieve, magnetic separator, and coarse crusher, and to separate the secondary coarse minerals using a movable device equipped with a crusher. The third step is crushing into split minerals, the fourth step is separating into secondary metal and slag by a movable device equipped with a vibrating sieve and magnetic separator, and the tertiary metal is separated by a movable device equipped with a rod mill. A fifth step of crushing, a sixth step of separating into quaternary ingots and primary intermediate ingots using a movable device equipped with a vibrating sieve and a rod mill, and a movable device equipped with a vibrating sieve and a ball mill. It is characterized by recovering concentrate with a high iron content from various furnace slags produced in the iron and steel manufacturing process, which consists of the seventh step of separating concentrate and secondary intermediate metal.

[Function] The action 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 producing high iron content. Concentrates and refined gold are recovered and used as concentrates for 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 first to seventh steps and part of the final process is mounted on movable equipment, and is moved to the vicinity of the slag storage location that is effective for slag treatment operations. At that location, these devices will be interconnected to perform continuous furnace slag processing operations.

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

Figures 1 and 2 show the furnace slag treatment process, respectively. In detail, Figure 1 shows the process from the first to the fourth process, and Figure 2 shows the process from the fifth to the seventh process.
It shows the process and the final process.

In the first step 10, a rotary sieve 14, a receiving tank 12, and a feeder 13 are mounted on a moving cart 15.
First, rough furnace slag 11 with a size of 300 to 500 mm or more, such as blast furnace slag, converter slag, and electric furnace slag generated in the iron and steel manufacturing process, is used as a resource and is transported from a receiving tank 12 via a feeder 13. The large lumps 16 with a size of 500 mm or more mixed in the rough furnace slag 11 are removed. As a result, it is supplied to the second and subsequent processes, which are downstream processes. Processing the rough furnace slag 11 with large lumps 16 still mixed in not only makes it difficult to operate the crushing equipment and other related equipment, but also reduces the separation efficiency for improving the iron content. Additional operations may be required.

In the second process 20, a vibrating sieve 22, a magnetic separator 24, and a coarse crusher 23 are mounted on a movable cart 25, and the furnace slag 21 from the first process 10 is received and passed through the vibrating sieve 22 to a size of 150 mm or more. 150 with sieve ore of dimensions
The sieve ore is separated into sieve ore with a size of mm or less, and the sieve ore is further subjected to magnetic separation by a magnetic separator 24, and the primary ingot 26 with an iron content of 60 to 80% or more and the iron content
Separate into 60-80% or less slag. This furnace slag is supplied to a rough splitting machine 23 and compressed force is applied to cause rough cracking or deformation to produce a primary coarse split ore 27 whose size is reduced to 150 mm or less, which is made of metal, slag, etc. Partial separation with mineral matter takes place. The undersieve ore from the vibrating sieve 22 is sent to a fourth step 50 as an intermediate ore 28 having a small size and a high slag content.

Next, 30 is a magnetic separator conveyor and a magnetic separator 31
In the process of transporting the primary coarse ore 27 to the next process, the primary ingot 32 with an iron content of 80 to 90% is sent to the fifth process, where it is subjected to magnetic separation. The primary coarse ore 41 from which the ingot 32 has been separated is sent to a third step 40.

In the third step, a crusher 42, such as a rotating crusher, is mounted on a moving cart 43.
The primary rough split ore 41 is received from the magnetic separation conveyor 30 and supplied to the crusher 42, where it is crushed by applying compressive force to form the secondary coarse split ore 44 whose dimensions are reduced to 80 mm or less. Partial separation of mineral materials such as slag and slag is further promoted. The secondary coarse split ore 44 is subsequently sent to a fourth step 50.

In the fourth step 50, a vibrating sieve 51, a conveyor 53, a magnetic separator 52, and a vibrating sieve 5 are placed on a moving cart 55.
4 is connected and installed, and receives the secondary coarse ore 44 from the third process 40 and the intermediate ore 28 from the second process 20, and uses sieving sorting and magnetic sorting together to reduce the iron content to 80. ~90% secondary metal 57, slag mainly composed of minerals 58, and vibrating sieve 51 50
It is separated into return ore 56 which is sieve ore having a size of mm or more. The nature of the material fed to the vibrating sieve 54 is essentially only minerals, and is made up of slag 58b with a size of 50 to 30 mm, slag 58a with a size of 30 to 5 mm, and slag 58a with a size of 5 to 0 mm by sieving and sorting. It is separated into slag and slag.

In the fifth step 60, a feeder 61 and a rod mill 62 are connected and mounted on a moving cart 63, and the primary ingot 26 from the second step, the primary ingot 32, and the second ingot from the fourth step are delivered. Next bullion 57
is received and crushed in Rod Mill 62.
A tertiary ingot 64 with an iron content of 60 to 80% is obtained which is reduced to 200 mm or less.

In the sixth step, a vibrating sieve 71, a feeder 72, and a rod mill 73 are connected to a movable cart 74, and the tertiary metal 64 from the fifth step 60 is received and passed through the vibrating sieve 71. The ingots on the sieve with a size of 50 mm or more, the intermediate ingots with a size of 50 to 10 mm, and the under-sieve ingots with a size of 10 mm or less are sorted by sieving, and the ingots on the sieve are supplied to a rod mill 73 and crushed. , obtain quaternary metal 75 reduced to 10 mm or less. The sieved intermediate metal is taken out from a part of the feeder 72 and separated into slag 78a and primary intermediate metal 79a with an iron content of 90 to 98% by magnetic separation during the transport process on the magnetic separation conveyor 77a. . The sieve base metal is the primary intermediate metal 7
6, the slag 78 and the primary intermediate metal 79 having an iron content of 90 to 98% are separated by magnetic separation during the transportation process on the magnetic separation conveyor 77.
The separation process between the slag and the primary intermediate metal is promoted by the fifth and sixth processes, and the primary intermediate metal is 7
The iron content of 9,79a increases.

In the seventh step 80, a vibrating sieve 81, a feeder 82, and a ball mill 83 are connected and mounted on a moving cart 84, and the quaternary ingot 7 from the sixth step 70 is
5 and the primary intermediate ingot 79 are received, and the vibrating sieve 81
sieve and sort into upper metal and lower metal by sieving,
The sieved metal is supplied to a ball mill 83 and crushed.
A coarse concentrate 85 reduced in size to 1 mm or less is obtained. The sieve base metal is used as a secondary intermediate metal 86 having a size of 2 mm or 5 mm or more, and is separated into slag 89a by magnetic separation during the transportation process on a magnetic separation conveyor 87.
and refined metal 88a with an iron content of 90 to 98%. In addition, in the refining step for further improving the refining of the seventh step 80, a vibrating sieve 81a is provided on the movable cart 84a, and the coarse concentrate 85 is received and sieved and sorted by the vibrating sieve 81a. The bottom of the sieve is separated as slag 89, and the top of the sieve is separated as concentrate 88 having a size of 1 mm or more.Since the coarse concentrate 85 has already been separated from the slag and is in an aggregated state, in the refining process, Concentrate 88 with an iron content of 90 to 98% can be obtained only by sieving and sorting.

In this way, concentrate 88 with a high iron content and refined gold 88a are recovered from the rough furnace slag 11 as concentrates for iron and steel manufacturing, and slags 58, 58 are recovered as slag.
a, 58b, 78, 78a and 89, 89a
are separated into different size ranges. Therefore, by adding operations such as blending, it can be used as is as aggregate for civil engineering.

[Effects of the Invention] According to the slag processing method of the present invention, the slag processing equipment used for main operations such as crushing, magnetic separation, and sieving in the slag processing process is mounted on movable devices. The slag is transported to a location close to the slag storage area that is effective for slag processing operations, and at that location, these devices are interconnected and continuous slag processing operations are performed. can be made extremely easy. In addition, the movable cart is equipped with slag processing devices connected to each other within a limited space, making it possible to process slag in an extremely narrow space. Furthermore, the process can be simplified because effective equipment combinations can be easily changed in response to improvements in the quality of the furnace slag in the furnace slag treatment process.

[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. 10...First step, 11...Rough furnace slag, 14...
Rotating sieve, 15...Moving trolley, 16...Large lump, 20
...Second process, 22... Vibrating sieve, 23... Rough splitter, 24... Magnetic separator, 25... Moving trolley, 26...
...Primary metal, 27...Primary coarse ore, 28...Intermediate ore, 40...Third process, 42...Crushing machine, 43...
...Moving trolley, 44...Secondary coarse ore, 50...4th
Process, 51... Vibrating sieve, 52... Magnetic separator, 57...
...Secondary metal, 58...Furnace slag, 60...Fifth process,
62...Rotsdomil, 63...Moving trolley, 64...
... Tertiary metal, 70 ... Sixth process, 71 ... Vibrating sieve, 73 ... Rod mill, 74 ... Mobile trolley, 7
5... Quaternary ingot, 79, 79a... Primary intermediate ingot, 80... Seventh step, 81... Vibrating sieve, 83...
... Ball mill, 84 ... Mobile cart, 85 ... Crude concentrate, 86 ... Secondary intermediate metal, 88 ... Concentrate, 88
a...Refined gold.

Claims (1)

[Claims] 1 The first step is to remove large lumps from the rough furnace slag using a movable device equipped with a rotating sieve, and the primary ingot and primary rough split ore are removed 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 the secondary coarse ore by a movable device equipped with a crusher, and the second step is to crush the secondary coarse ore by a movable device equipped with a vibrating sieve and a magnetic separator. The fourth step is to separate the ingot and slag, and the fifth step is to crush the tertiary ingot into tertiary ingot using a movable device equipped with a rod mill. 6th to separate into intermediate bullion
Concentrate with a high iron content is extracted from various types of furnace slag produced in the iron and steel manufacturing process, which consists of the seventh step of separating coarse concentrate and secondary intermediate ingot using a movable device equipped with a vibrating screen and a ball mill. A furnace slag treatment method characterized by recovering.