JPS6221057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for sampling sinter on a strand.

It goes without saying that in a method for producing sintered ore using a Dwight Lloyd sintering machine (hereinafter simply referred to as a sintering machine), it is very important to improve the quality of the sintered ore obtained.

In particular, the production of highly reducible sintered ore has been attracting attention recently, and research is being carried out for this purpose. In order to obtain highly reducible sintered ore, the sintering process of sintered ore has been investigated and various measures have been taken to reduce the FeO content in sintered ore. In addition, the quality of sintered ore after firing differs in the layer height direction, and in order to reduce this difference, the sintered ore on the strand is actually sampled in the height direction, and the quality is measured at each height. The quality of sintered ore must be investigated and known.

Conventionally, one of the methods for sampling sintered ore on a strand was to sample the sintered ore on a single pallet together with the pallet. In this method, the sintering machine is stopped midway, the sintered ore on one pallet is cut from the sintered ore before and after it using a tool such as an electric pick, and after cutting, the pallet is lifted up and removed from the pallet. It was meant to be sampled from time to time.

However, in the conventional sampling method described above, cutting the sintered ore takes a long time, requiring 10 workers for two hours, during which time the sintering machine is stopped. Therefore, this has become one of the factors hindering productivity improvement.

Furthermore, this work involved high-temperature, heavy-strength labor, resulting in a poor working environment, which needed to be improved in terms of occupational health.

The present invention has been made in view of the above circumstances. (1) After charging the mixed raw materials to the pallet and before igniting, a linear combustion suppressing material is installed on the surface layer of the raw material corresponding to the pallet connection part. The method is characterized in that the pallet is then ignited and sintered to form a crack below the combustion suppressing section, and the entire pallet is extracted after leaving the ignition furnace and before reaching the ore discharge section. Method of sampling sinter on strands.

(2) The method of sampling sintered ore on a strand as described in item (1) above, in which the linear combustion suppression part is formed by linearly injecting water onto the surface layer of the raw material.

The present invention will be explained in detail below based on the drawings.

FIG. 1 is a perspective view of essential parts of a sintering machine showing an embodiment of the present invention.

As illustrated in the drawings, the present invention provides a guide 3 above the pallet 2 in front of the ignition furnace 1 of the sintering machine, and a faucet 5 attached to a movable body 4 that moves along the guide 3 in the width direction of the pallet 2. A large number of pallets 2-0, 2-1, 2-2, 2-3 are arranged facing downward and are arranged endlessly and move at low speed in the direction of arrow 6...The surface layer of the raw material 7 charged upwards. For example, the palette 2-1 to be sampled
Water is injected in a straight line at the position corresponding to the connection part between the pallet 2-2 and the adjacent pallet 2-2, in other words, at the full width position of the raw material surface layer directly above the connection part. Then, the next arriving pallet 2-0 and the pallet 2-1
Similarly, water is poured in a straight line across the entire width of the surface layer of the raw material corresponding to the connection with the raw material. In this way, one pallet to be sampled is separated from adjacent pallets.

After this, when the material is passed through the ignition furnace, the surface layer of the material corresponding to the front and rear boundaries of pallet 2-1, which corresponds to the front and rear boundaries of one pallet 2-1, is not ignited, and the mixed material on pallet 2-1 is Even if sintering is completed over the entire layer, sintering is not performed at the water injection location, and cracks are generated in this location from the upper layer to the lower layer of the sintered ore on the strand. In other words, a dividing line equivalent to that created artificially by an electric pick or the like in the conventional method is naturally formed by sintering the adjacent parts.
This crack serves to separate one pallet's worth of sintered ore from the sintered ore on the preceding and following pallets. Therefore,
The pallet can be lifted as it is without much cutting work, and sintered ore can be sampled.

Note that even on the strand where sintering is in progress, cracks are generated in the layer where sintering has already been completed, so sampling during sintering is also possible.

The guide 3 used in the method of the present invention is installed so as to be tilted toward the ignition furnace 1 by an angle θ in the horizontal direction with respect to a horizontal virtual line 8 drawn in a direction perpendicular to the strand length direction. This is to accommodate the progress of the pallet in the direction of the arrow 6 while the faucet 5 runs along the guide over the entire width of the pallet. This angle θ is preferably determined based on the sintering machine and the average operating conditions of the sintering machine. Water can be injected in a straight line by changing the speed of the moving body 4 to follow changes in the speed of the pallets that change depending on operating conditions. Alternatively, the angle θ may be adjusted according to the pallet speed while keeping the speed of the moving body 4 constant.
It may be configured to change.

Furthermore, in the method of the present invention, the amount of water injected is approximately 1
A range of Kg/m to 1.5Kg/m is suitable, and 1Kg/m
If the water is less than 1.5 kg/m, it is difficult to sufficiently generate cracks, and on the other hand, even if a large amount of water is poured over 1.5 kg/m, no commensurate effect can be expected, and the unsintered portion will increase unnecessarily, causing the sintering to deteriorate. This is not preferable because it deteriorates the yield of concretions.

In addition to forming the linear combustion suppressing portion according to the present invention by pouring water, it is also effective to press the surface layer of the blended raw material in a linear manner as if pressing a mark.

When the method of the present invention was implemented, sinter sampling work that used to take 10 people and about 2 hours using the conventional method was completed in 20 minutes with 3 people.

As described above, according to the present invention, it is no longer necessary to cut the sintered ore on the sintering machine strand, which was previously done by many hands for a long time, and the heavy labor work in a high-temperature environment can be significantly shortened. Therefore, it is not only effective for the occupational health of workers, but also contributes to improving productivity by reducing the down time of the sintering machine, and furthermore contributes to improving the quality of sintered ore.
There are big advantages.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of a sintering machine showing an embodiment of the present invention. 1: Ignition furnace, 2: Pallet, 3: Guide, 4:
Mobile object, 5: Faucet.

Claims (1)

[Scope of Claims] 1. A linear combustion suppressing section is provided on the surface layer of the raw material corresponding to the pallet connection part after charging the blended raw materials into the pallet and before igniting, and then igniting and sintering the raw material to prevent the combustion. 1. A method for sampling sintered ore on a strand, which comprises forming a crack below a restraining part and extracting the entire pallet after it leaves an ignition furnace and before reaching an ore discharge part. 2. The method for sampling sintered ore on a strand according to claim 1, wherein the linear combustion suppressing portion is formed by linearly injecting water into the surface layer of the raw material.