JPS5834533B2 - How to stow fine ore - Google Patents

Description

[Detailed Description of the Invention] This invention provides Sio
When stacking two or more types of ores, including ores that are rich in minerals, the stacking method is to ensure a uniform layer thickness.The loading of fine ore is related to the method.The raw materials for sintering are various types of fine ore. , blast furnace dust, converter slag, sulfuric acid slag.

In order to produce high-grade sintered ore with high productivity using a mixture such as coke powder, it is necessary to always mix the sintering raw materials at a constant ratio and charge the sintering machine. be.

Therefore, the above-mentioned types of fine ore are piled up in several layers in order of brands at a bedding yard, and the stacked pile of fine ore is cut out with a constant width in the transverse direction from the top to the bottom. Mixed raw materials are used in proportions.

However, among the raw material powder ores, such as silica and serpentine,
From the average target value of S io 2 content (6%), Habo 1
Fine ore with a high content of 5102, which contains a large amount of S102 of 0% or more, has a small angle of repose due to its coarse grain size and low adhesion of moisture, so there is a problem that flow at the bottom occurs during stacking.

FIG. 1 is a diagram showing the state of the conventional stowage, in which fine ore 2a' is piled up in layers in a bedding yard 1'.

2b', 2c' are powder ores 3a', 3 rich in 8102 min.
As the flow reaches b', the layer thickness becomes uneven as shown in the figure, and as a result, segregation occurs in the components in the cross-sectional direction. Such component segregation causes variations in the basicity of the sintered ore. Ta.

Conventionally, the following methods have been used to solve the above-mentioned component segregation.

■ Increase the number of layers when stacking.

By increasing the number of stacking layers as much as possible, the influence of each layer can be minimized.

■ Perform simultaneous betting.

Since the angle of repose differs depending on the type of ore, segregation can be prevented to some extent by combining brands with large and small angles of repose.

■ Specify the time for loading.

In the center layer and the final layer, brands as close to B powder components as possible are piled up in order to extract as many single brands as possible.

However, increasing the number of layers in the stacking described in ■ above will lead to a decrease in work efficiency, and simultaneous loading as described in Even if the loading is planned, there may be a shift in conveyor priority due to problems with the moving equipment or unstable movement of the ship.
There were problems with loading the items out of order.

From the above-mentioned viewpoints, the present invention aims to provide powder ore that does not cause foot flow and component segregation when stacking two or more types of fine ore containing 8102-rich ore in a bedding yard. Ore stowage provides a method;
When loading two or more types of ores including 8102-rich ores, before loading the 8102-rich ores,
This method is characterized in that a predetermined amount of water is sprinkled on the surface of the ore that has already been stowed.

Next, the method of this invention will be explained with reference to the drawings.

FIG. 2 shows an example of the method of this invention in a state diagram.

In this invention method, when stacking fine ore containing 5i02, such as silica stone and serpentine, on the fine ores 2a, 2b, and 2C stacked in layers in the bedding yard 1, the loading has already been completed in advance. On the surface layer of the fine ore 20, a plurality of water pipes are installed at regular intervals on the trackbeds 5, 5' on both sides of the length of the bedding yard 1 shown in a schematic plan view in FIG. Nozzles 4a, 4b, 4c.

4d, 4e, 4a', 4b', 40', 4d', 4e'
A certain amount of water is injected from the container to moisten the surface layer of the ore powder 20, and then the ore powder 3a with high 5102 content is piled up.

By doing as described above, the S io 2-rich coarse ore 3a is piled up in a uniform layer thickness without causing any flow on the surface layer of the fine ore 20 that has already been piled up.

Next, the SiO2-rich powder ore 3 is loaded as described above.
8, water supply nozzle 4a+4bt4c t 4d t
4e, 4a', 4b't4c't4d'.

After a certain amount of water is injected from 4e' in the same manner as above, the next layer of S io 2 high content coarse ore 3b is piled up, and in this way, each layer is piled up with uniform thickness and without segregation.

The water supply nozzle 4a t 4b, 4c > 4ct
t4e4a', 4b', 40', 4d', and 4e' can be rotated by 180 degrees, and have a structure that can maintain the nozzle angle at or above the angle of repose of the bedding powder, and the number of installed nozzles is The number may be any number depending on the area of the dingyard 1.

In addition, the amount of water sprayed during stowing is set to an appropriate amount to achieve the effect of preventing flow at the bottom depending on the layer thickness, and if necessary, water may be sprinkled inside during stowing.

Next, an example will be described.

(1) Loading is fine ore brand 1st layer 2a Colesworthy 5iO2 7.0% 2nd layer 2b
Itabira 5i025.0% 3rd layer 2 CN, B, R, 5iO20.9% 4th layer 3
a Serpentine rock 5in240% 5th layer 3b Silica stone 5iO293% (2) Layer thickness of each layer 50~150% (3) Bedding yard area 28m x 250i x 4 sides (4) Number of water supply nozzles installed 10 per side (5) Watering period After loading the third layer 2C, water was sprinkled on its surface under the following conditions.

500 x /min x 6 mml 1 nozzle I was able to carry out the loading.

In the embodiment shown in FIG. 2 above, for the sake of clarity, the case where the number of stacking layers is five has been explained, but in reality, the stacking is done in several tens of layers.

As explained above, according to the method of this invention, SiO2
When stacking fine ore rich in minerals, it is possible to stack without tail flow and component segregation, and high-quality sintered ore can be manufactured with high productivity.
Excellent effects are brought about.

[Brief explanation of drawings]

FIG. 1 is a state diagram of conventional stowing, FIG. 2 is a state diagram of stowing according to the method of the present invention, and FIG. 3 is a plan view of a bedding yard. In the drawings, 1.1'...bedding yard, 2a, 2b. 2c, 2a', 2b', 20'...Powder ore, 3
a, 3b. 3a', 3b'... Powder ore rich in SiO2,
4a. 4b..., 4a', 4b'... Water supply nozzle,
5, 5'...Dodoko.

Claims (1)

[Claims] 1 At the bedding yard, when stacking two or more types of ore, including ore rich in S io 2,
A method for loading fine ore, characterized in that, before loading ore rich in iO2, a predetermined amount of water is sprinkled on the surface layer of the already loaded ore.