JPH10330853A - Method for sintering non-ferrous smelting raw material and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating method which can treat slurry state raw material, such as lead-containing raw material without obstructing the ventilation in an ore layer, at the time of sinter-treating the slurry-state raw material with a Dwight Lloyd sintering machine. SOLUTION: At the time of sinter-treating by forming the ore layer of non-ferrous metallic smelting raw material on a bed in the Dwight Lloyd type sintering machine 10 in the sintering method of the non-ferrous metallic smelting raw material, the slurry-state raw material is charged on the surface of the layer in a hood 14 of the Dwight Lloyd sintering machine and oxidize-sintered. Then, the temp. of the ore layer at the position charging the slurry-state lead- containing raw material is requlated to 1300-1500 deg.C. At this time, the position of a supplying tube 22 in the sintering part is desirable to be the outlet side in comparison with the center part. Further, at the time of screening the sinter- treated raw material, since the one oxidize-sintered from the slurry-state raw material becomes minus-sieve, the minus-sieve raw material is returned back to the sintering treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintering method and apparatus using a Dwyroid type sintering machine used in a sintering process of nonferrous metal smelting.

[0002]

2. Description of the Related Art In a sintering process of nonferrous metal smelting, a continuous Dwyroid sintering machine 10 for moving a conveyor pallet 12 as shown in FIG. 1 is generally employed. The pallet 12 becomes a bed of the sintering raw material, on which an ore layer of the sintering raw material is formed. In particular, lead smelting and IS
In the sintering process of zinc and lead smelting by the P method, an upward ventilation sintering method is performed in order to prevent deterioration of ventilation of the ore layer due to molten Pb generated on the bed (Reference: Nippon Metal) Society edition: Lectures, Modern Metallurgy Refining Edition 2 Nonferrous Metal Smelting, The Japan Institute of Metals (1980)). That is, the sintering raw material is sent from the granulating equipment (not shown) to the hoppers 16 and 20 by the supply device 36. Further, air is sent from below by the air supply device 26 and ignition is performed from above by the ignition device 18. Further, a hood 14 is provided for collecting the generated SO ₂ gas, and the SO ₂ gas is sent to a cooling tower (not shown) through an exhaust pipe 34. The sintered mass is carried out by the pallet 12.

However, in the actual operation, the air permeability in the ore layer is reduced by the influence of the composition of the sintering raw material, the compound form, the properties such as the particle size distribution and the like, and the fluctuation of the operation in the granulation step which is a pretreatment step of the sintering raw material. Change. Therefore, in order to maintain good air permeability, it is necessary that the sintering raw material that can be supplied to the sintering machine 10 be granulated even in the upward ventilation sintering method. With respect to the change of the state, the thickness of the bed ore and the moving speed of the pallet, the ratio of the returned powder charged to the sintering machine to the charged amount,
In some cases, it is important to adjust the composition of the sintering raw material.

The powdery sintering material basically enters the Dwyroid sintering machine 10 in the form of pellets in a granulation step using water as a binder. In the Dwyroid type sintering machine 10,
As described above, the hopper 16 and the ignition furnace 18 are installed in front of the sintering machine 10, and the hopper 16
A certain amount of humidified raw material is supplied as an ignition ore layer,
The surface is ignited when passing through the ignition furnace 18, and then the raw material is supplied from the hopper 20 so as to have a certain height on the ore layer for ignition. At this time, the air permeability in the mineral layer is adjusted to be uniform.

[0005] Of the sintering raw materials, for example, those containing a low melting point metal such as lead, such as blast furnace dust passed through a condenser for splashing lead metal that catches zinc vapor, through a granulation step, Lead and the like melt and deteriorate the air permeability in the mineral layer. For this reason, when using a sintering raw material containing a low melting point metal such as lead, the sintering raw material is oxidized in advance and mixed with various raw materials and returned powder before pelletizing in the granulation step.

However, as raw materials containing a low-melting-point metal such as lead (hereinafter referred to as "lead-containing raw materials"), there are many wet-collected dusts, and at the time of generation, slurries (50% moisture). Often it is. Therefore, in addition to having a low melting point, in addition to being in a slurry state, it is costly and difficult to oxidize the low melting point metal contained in the lead-containing raw material until it is completely oxidized. is there. For this reason, a lead-containing raw material is usually mixed with other raw materials or flour powder and granulated while a low melting point metal such as lead is still present as a metal.

[0007] Therefore, the amount of the lead-containing raw material to be treated per unit period is naturally limited, and it has been difficult to efficiently treat the lead-containing raw material.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for operating a slurry raw material, such as a lead-containing raw material, which can be processed without impairing air permeability in an ore layer when sintering the raw material with a Dwyroid sintering machine. Providing is an issue.

[0009]

According to the method of sintering a nonferrous metal smelting raw material of the present invention, when a nonferrous metal smelting raw material ore layer is formed on a bed of a Dwyroid type sintering machine and subjected to sintering, The slurry raw material is charged into the surface of the ore layer in the hood of the Dwyroid sintering machine and oxidized and fired. Here, the temperature of the ore layer at the position where the slurry-like lead-containing raw material is charged is set to 120 ° C.
0 to 1500 ° C., preferably 1300 to 150 ° C.
It is particularly preferred that the temperature be 0 ° C. For this reason, the position of the supply pipe in the sintering section is preferably closer to the outlet than the center. Furthermore, when the raw material subjected to the sintering process is sieved, the material obtained by oxidizing and firing the slurry-like raw material enters under the sieve. Therefore, it is preferable to return the raw material under the sieve to the sintering process.

The apparatus for sintering a nonferrous metal smelting raw material of the present invention has a supply pipe for dropping a slurry raw material on a ceiling of a hood of a Dwyroid type sintering machine.

Since the amount of the sintering raw material to be charged is also affected by properties such as the water content of the slurry, it is preferable to calculate the heat balance or the like in advance.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows a Dwyroid sintering machine 10 to which the method of the present invention is applied. The sintering machine 10
Then, in addition to the hoppers 16, 20 and the ignition furnace 18,
Supply pipe 22 for slurry-like lead-containing raw material on ceiling of sintering section hood
Is arranged. Then, as described above, a bed of the sintering raw material is formed on the pallet 12, where the ore layer is formed. Operation of the Dwyroid sintering machine 10 is as described for the prior art.

[0013] In the method of the present invention, the slurry-like lead-containing raw material is called, for example, a blue powder cake, and is pumped by a pump (not shown) from a collection place such as an ISP.
It is charged from the supply pipe 22 onto the ore layer burning at 1200 ° C. or higher. Therefore, the charged slurry-like lead-containing raw material is rapidly dried and fired. Then, the lead-containing raw material is separated from the sintered mass by the sieving device 24, and is homogenized with the returned powder that becomes the core of the pellets in the crushing step, pelletized, and supplied to the sintering machine 10. The pump is preferably a double cylinder pump.

The reason why the lead-containing slurry is charged onto the ore layer burning at 1200 ° C. or higher is that at or below this temperature, the amount of heat retained in the ore layer itself is not sufficient, the temperature decreases, and Is incompletely oxidized. Note that 13
If the fuel is burned at a temperature of 00 ° C. or more, there is no possibility of a shortage of heat, and a stable operation state can be secured.

Normally, the maximum temperature at which the ore layer burns is 15
The temperature is about 00 ° C., and it is rare that the temperature becomes higher than this.

The state of the ore layer from the charging portion of the sintering raw material to the outlet portion is such that combustion at the upper portion of the ore layer is not observed up to the center portion, and the surface thereof is darkened. It becomes a red heat state of 1200 ° C. or more.

In the Dwyroid type sintering machine 10, the ore layer moves and burns while moving sequentially by the movement of the pallet 12, so that the slurry-like lead-containing raw material charged on the surface of the ore layer is deposited to a constant thickness. However, it is preferable that the slurry-like lead-containing raw material is deposited as uniformly as possible from the viewpoint of combustion efficiency. In order to do this, for example, as shown in FIG. 2, a three-way opening 32 is provided at the tip of the supply pipe 28 for the slurry-like lead-containing raw material, which is directed downward and obliquely downward in the horizontal direction with respect to the moving direction.
Is provided, and when charged from here, it is possible to make the slurry-like lead-containing raw material layer uniform.

In the method of the present invention, since a low melting point metal such as lead is exposed to a high temperature in a sintering furnace and air is supplied from below, the metal is reliably oxidized, and the And then pelletized and supplied to a sintering furnace. As a result, there is a low possibility that the presence of the low-melting-point metal causes ventilation inhibition.

The present invention is not limited to lead-containing raw materials, but is applicable to various slurry raw materials.

[0020]

Next, the present invention will be further described with reference to examples.

[Embodiment 1] Dwyroid type sintering machine 10
In order to drop the slurry-like lead-containing raw material onto the ceiling of the hood 14 at a slightly outlet side from the center of the sintered part of
And a 12.5 cm diameter single pipe nozzle 2
8 were provided. The distance between the single tube nozzle 28 and the pallet 12 is 2
m. The operation was performed for 30 days while supplying the slurry-like lead-containing raw material toward the surface of the mineral layer on the pallet 12 at a rate of 50 t / day from the single pipe nozzle 28. At this time,
The temperature of the ore layer where the slurry-like lead-containing raw material is supplied is 1
The maximum temperature at the outlet side was 1,420 ° C.

The calcined ore discharged from the sintering machine 10 is sieved by a sieving device 24, and the sifter is used under the sieve as a return powder.
Pelletized and repeated in the system.

The supply of the slurry-like lead-containing raw material from the nozzle 28 was left to the pushing force of a double-cylinder pump (not shown), but was relatively uniformly dispersed over the entire surface of the ore layer.

During the operation, there was no abnormal melting at low temperature, and good air permeability could be maintained.

Example 2 The temperature of the ore layer at the supply position of the slurry-like lead-containing raw material was 1300 ° C., and the maximum outlet temperature was 150 ° C.
The operation was performed for 30 days in the same manner as in Example 1 except that the temperature was set to 0 ° C.

During the operation, there was no abnormal low-temperature melting, and good air permeability could be maintained.

Example 3 A test operation was carried out for 30 days in the same manner as in Example 2 except that the amount of the lead-containing slurry material supplied from the single tube nozzle 28 was changed to 80 t / day.

During the operation period, there was no abnormal low-temperature melting and good air permeability was maintained.

Example 4 Example 2 is the same as Example 2 except that a three-way nozzle 28 having a diameter of 12.5 cm and an opening size of 3 cm, which is provided at the tip with openings at both diagonally lower sides as shown in FIG. 2, was used. A test operation was performed for 30 days in the same manner as in the above.

The slurry-like lead-containing raw material was uniformly dispersed, there was no abnormal low-temperature melting during the operation period, and good air permeability could be maintained.

Comparative Example 1 The temperature of the ore layer at the supply position of the slurry-like lead-containing raw material was set to 500 ° C., and the maximum temperature on the outlet side was set to 1100.
The operation was performed for 30 days in the same manner as in Example 1 except that the temperature was changed to ° C.

During the operation, abnormal melting at a low temperature occurred, and good air permeability could not be sufficiently maintained.

Comparative Example 2 Dwyroid Sintering Machine 10
The slurry-like raw material was dropped on the ore layer on the hopper side from the center of the sintering section, but this caused airflow obstruction at the center of the sintering section.

[0034]

According to the method of the present invention, since the slurry-like raw material is supplied onto the burning ore layer, the low-melting-point metal in the slurry-like raw material can be surely changed to a high-melting-point oxide. Stable processing of the slurry-like raw material can be easily performed, and thus productivity can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a Dwyroid sintering machine.

FIG. 2 is a side view of an example of a three-way shift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dwyroid sintering machine 12 Pallet 14 Food 16 and 20 Hopper 22 Supply pipe 24 Sieving device 28 Slurry supply nozzle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisarige Inoue 346-4 Miyanishi, Harima-cho, Kako-gun, Hyogo Prefecture Inside the Harima Works of Sumitomo Metal Mining Co., Ltd. 5. Sumitomo Metal Mining Co., Ltd. Niihama Research Laboratory

Claims (5)

[Claims] When a sintering process is performed by forming an ore layer of a nonferrous metal smelting raw material on a bed of a Dwyroid type sintering machine,
A method for sintering a nonferrous metal smelting raw material, comprising charging a slurry-like raw material to a surface of an ore layer in a hood of a Dwyroid sintering machine and oxidizing and firing the raw material. 2. The sintering method according to claim 1, wherein the temperature of the ore layer at the position where the slurry raw material is charged is set to 1200 to 1500 ° C. 3. The sintering method according to claim 1, wherein the slurry-like raw material is a lead-containing raw material. 4. A sintering method comprising sieving the raw material sintered according to claim 1 and returning the raw material under the sieve to sintering. 5. A nonferrous metal smelting raw material sintering apparatus provided with a supply pipe for dropping a slurry-like raw material on a hood ceiling of a Dwyroid type sintering machine.