JPH09194956A - Pretreatment of raw material to be sintered - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for obtaining pseudo paricles with a uniform diameter by kneading powdery ores, improving the nonuniformity of water content in a raw material which occurs at the time of granulating and uniformly adding water content to the raw material. SOLUTION: The pretreatment method for a raw material to be sintered is executed by sieving the powdery ores with a sieving machine 3, kneading these minus sieved ores 9 with a kneader and, thereafter granulating the ores with a granulating machine to produce the material to be sintered. Then, moisture is added to the minus sieved ores 9 in the process of sieving the powdery ores with the sieving machine. Deficient moisture is further added with the kneader and/or granulating machine to the minus sieved ores 9 which is mixed with some moisture by the sieving machine 3.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of adding water during sieving, kneading and granulating of fine ore in a pretreatment process of a sintering raw material.

[0002]

2. Description of the Related Art In the step of pre-treating a sintering raw material, the purpose is to knead and granulate the raw material to produce pseudo particles.
There is a proper particle size in the pseudo particle size, and proper water content is necessary to produce a pseudo particle having a proper particle size. For example, in JP-A-60-138020, a pseudo particle size of 5 to 2 mm is desirable in order to improve the drop strength and yield of the product sintered ore, and the optimum water content is the added water content during kneading and granulation. Suggests that there exists. When making these pseudo particles, the necessary water content is generally added by a kneader or a granulator.

For example, the above-mentioned JP-A-60-13802.
No. 0 or Japanese Patent Publication No. 63-20288, a kneading machine is used to add water, and a granulator is used to add water. However, in the water addition method, because of the structure of the kneader, the raw materials inside the kneader move in a bundle, so that the surface area of the raw material that can come into contact with the added moisture becomes a limited area. However, since the kneading time was several tens of seconds, there was a limit in achieving uniform water content in the raw material. If uniform moisture is not added to the raw material during this kneading, the raw material with excessive moisture will become pseudo-particles with an excessively large diameter during granulation, and the raw material with excessive moisture will not become pseudo-particles and Since it remains, pseudo particles having a uniform diameter cannot be obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention improves the non-uniformity of the water content in the raw material generated when kneading and granulating powder ore,
It is intended to provide a method for obtaining pseudo particles having a uniform diameter by uniformly adding water to a raw material.

[0005]

Means for Solving the Problems The present invention has been made in order to solve the above problems, and means 1 is to screen fine ore with a sieving machine and knead the under-sieving ore with a kneader. After that, in the pretreatment method of the sintering raw material granulated by a granulator and used as the sintering raw material, the sinter is characterized by adding water to the under-sieved ore during the sieving of the powdered ore by the sieving machine. There is a pretreatment method for the binding raw material, and the means 2 is sintering characterized by adding insufficient water to a subsift ore to which water has been added by the sieving machine by a kneader and / or a granulator. It is in the pretreatment method of raw materials.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is characterized in that water is added to an under-sized ore being sieved by a sieving machine used for pretreatment of a kneading machine. The under-sieving ore during sieving with a sieving machine falls from the entire area of the effective area of the net, and as it passes through the net, it falls in a state of being dispersed in unit ores, so the surface area of the under-sieving ore increases extremely. However, there is a space between the ores. When water is added to the under-sieved ore in this state, the water and the under-sieved ore easily come into contact with each other. In addition, the water can freely move in the space formed between the undersized ores, and the water can be distributed throughout the undersized ore.

For the above reasons, the added water is evenly added to the undersize ore within a short period of time, and the addition of water is performed uniformly, and the water content in the undersize ore becomes uniform. Pseudo particles having a uniform diameter will be obtained at the time of granulation. Also,
The amount which is insufficient due to the addition of water is added by a kneader and / or a granulator, but the addition amount is small and the mixing is good even in a short time.

Next, specific examples of the present invention will be described. FIG. 2 is a facility flow chart showing an embodiment. In this embodiment, ordinary sintering raw materials are conveyed by belt conveyors 1a and 1b to bunkers 2a and 2b of different systems,
Fine ore is cut out from the bunker 2a, which is stored, and sieved by a sieving machine 3. The coarse-grained portion of the sieved ore is directly supplied to the mixer 14. Water is added to the fine powder portion under the sieve by a water addition device 4 installed immediately below the sieving machine 3.

After that, it is sent to the kneading machine 12 and kneaded while adding water if necessary, and when the water is insufficient, it is granulated while adding water also in the granulator 13 such as a pan pelletizer. , Become pseudo particles. The pseudo particles merge with the coarse particle portion on the sieve of the sieving machine 3, or, though not shown, independently of the coarse particle portion, the mixer 1
4. On the other hand, the raw material stored in the bunker 2b is directly supplied to the mixer 14. Mixer 14
In the above, the pseudo particles are coarse particles on a sieve and a sieving machine 3
Mixed with other ingredients that do not pass through
It is granulated, becomes a sintering raw material, and is sequentially supplied to a sintering machine (not shown).

FIG. 1 shows the details of the water addition device 4 in the sieving machine 3, where (a) is a front view and (b) is a side view thereof. A plurality of nozzles 7 are arranged on both sides immediately below the sieve net 5 to add water to the under-sieve ore 9 which is sieved and drops from the entire surface of the sieve net 5. The sieving machine 3 has a length of 5
~ 8m, width about 2-2.5m, effective sieve area is 10
There is about 20 m ² . Moreover, since the opening of the sieve mesh is about 3 to 6 mm, the ore 9 under the sieve has a sieve mesh surface (10 to 20 m).
² ) The whole surface of the ore 9 under the sieve becomes extremely large because it falls into the unit of 3 to 6 mm in the state of being dispersed in the particles of 3 to 6 mm, and the space between the particles is formed. The contact between the sieving ore 9 and the sieving ore 9 is extremely easy within a short time. In the equipment shown in FIG. 2, the present invention was carried out under the condition of adding water to the powdered ore shown in Table 1, and kneading machine 1
Figure 3 shows the results of an investigation of the degree of homogenization of water content in the ore on the output side of No. 2.

[0011]

[Table 1]

FIG. 3 shows the result of measuring the water content of each of the ores on the belt conveyor B on the outlet side of the kneading machine 12, which was divided into 10 parts. It can be seen that when water is added only by the kneading machine 12 of Case 3 which is a conventional example, a portion having excessive water and a portion having insufficient water occur in the ore. On the other hand, when the entire amount of water is added by the sieving machine 3 of Case 1 which is an example of the present invention, the water content in the ore is much more uniform than that of Case 3 in which water is added only by the kneading machine 12. Has been obtained.
In addition, in this result, water was added to the ore under sieving,
Further, in case 2 added by a kneader or a granulator, the water content in the ore in the middle of cases 1 and 3 is made uniform. Furthermore, the result of having investigated the pseudo particle diameter on the outlet side of the granulator 13 is shown in FIG.

As shown in FIG. 4, Case 1 in which the entire amount of water was added in the under-sieving ore during sieving is considered to have an appropriate particle size than Case 3 in the conventional example in which water was added only by the kneading machine 12. It can be seen that the proportion of pseudo particles of ~ 2 mm is increasing. In addition, in this result, in the case 2 in which water was added to the under-sieving ore during sieving and further added by a kneader or a granulator, the proportion of pseudo particles of 5 to 2 mm in the middle of the cases 1 and 3 A rising effect is obtained.

[0014]

INDUSTRIAL APPLICABILITY As described in detail above, by adding water to the under-sieved ore during sieving according to the present invention, the non-uniformity of water addition that occurs when kneading and granulating powdery ore is significantly improved. It is possible to produce pseudo particles having a uniform diameter, and it is possible to achieve great effects such as improving the drop strength and yield of the sintered ore.

[Brief description of the drawings]

FIG. 1 is a diagram showing a water addition state in a sieving machine according to this embodiment.

FIG. 2 is a facility flow chart of this embodiment.

FIG. 3 is a diagram showing the degree of homogenization of water content in the ore on the output side of the kneader.

FIG. 4 is a diagram showing the ratio of the pseudo particle size on the delivery side of the granulator.

[Explanation of symbols]

 1 Belt Conveyor 2 Bunker 3 Sieving Machine 4 Moisture Adding Device 5 Sieve Net 6 Header 7 Nozzle 8 Moisture 9 Sieve Ore 10 Sieve Ore 11 Chute 12 Kneader 13 Granulator 14 Mixer

Claims (2)

[Claims] 1. A pretreatment method for a sintering raw material, which comprises sieving powdered ore with a sieving machine, kneading the under-sized ore with a kneader, and then granulating with a granulator to obtain a sintering material. A pretreatment method for a sintering raw material, which comprises adding water to an ore under the sieve being sieved by a sieving machine. 2. A pretreatment method for a sintering raw material, which comprises adding insufficient water to a subsieve ore to which water has been added by the sieving machine by a kneader and / or a granulator.