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Unloading methods for aqueous bulk materials

A technology of bulk material and unloading machine, which is applied in the direction of bulk cargo, loading/unloading, cargo handling equipment, etc. It can solve problems such as unloading failures and achieve the effect of improving the efficiency of unloading operations

Active Publication Date: 2017-04-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that in the middle stage or the second half of the unloading process with an unloader, etc., a dent is formed on the bulk material after being grabbed by a grab bucket for unloading, etc., and not only powder particles are generated here, but water gushing is cloudy The suspended water gushes and accumulates in the state, and it will soon become slurry, which will lead to unloading failure
[0003] In addition, when unloading from a ship encounters heavy rain, etc., regardless of whether the unloading continues, the bulk material becomes high-moisture, and the rainwater accumulates in the bottom of the hold. From this point of view, the same unloading failure may occur. Phenomenon
[0004] This situation is also the same in countries with rainy seasons. If there is no roof covering bridge cranes and unloaders including ships, there will be high moisture in the bulk materials during unloading, which will soon disappear as unloading continues. It becomes a slurry, which leads to the problem of unloading failure

Method used

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  • Unloading methods for aqueous bulk materials
  • Unloading methods for aqueous bulk materials
  • Unloading methods for aqueous bulk materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Taking the Carajás iron ore as an example for illustration, the Carajás iron ore is iron ore that is separated from bulk materials during the import process, and is in a state of water gushing at the bottom of the cabin when it arrives at home.

[0102] for those in Image 6 For unloading iron ore in the state shown in (a), when unloading Carajas iron ore with a moisture content of 7.9% by mass to 24.7% by mass from a transport ship, an acrylamide-based polymer coagulant is added , the amount added is such that the concentration of the chemical solution reaches 0.6% by mass relative to the amount of suspended water gushing. The amount of polymer coagulant that should be added is determined by the following method: Since the suspended water inrush Wm is generated after grabbing with a grab bucket, the amount of polymer coagulant relative to the amount of the suspended water inrush Wm is estimated from the capacity of the grab bucket , so as to determine the amount of po...

Embodiment 2

[0107] will be at Image 6 (a) When Carajas iron ore, an example of the bulk material 2 in the state shown, is unloaded from the cabin 1 of the transport ship, polyacrylate resin particles as a polymer water-absorbing agent are added instead of polymer agglomeration in Example 1 agent, and its addition amount is 1.0-2.0% by mass relative to the amount of suspended water gushing.

[0108] The amount of the polymer water-absorbing agent to be added is determined by the following method: Since the suspended water gushing Wm is generated in the depression 4 after being grabbed by the grab bucket, the capacity of the grab bucket 5 is used to estimate the amount of the polymer water-absorbing agent relative to the suspended water gushing amount. to determine the amount of polymer water-absorbing agent that should be added. Similarly, the judgment that the weight ratio of the bulk material expressed by the weight ratio to the weight ratio of the suspended gushing water is 7 or more ...

Embodiment 3

[0115] In the following, we will continue to use a continuous unloader to unload iron ore with excessive water content during a heavy rain as an example.

[0116] Even in heavy rain, continue to use such as Figure 7 The bucket of the continuous unloading machine shown is unloading. As the unloading operation progresses, when the second half of unloading reaches the stage of the lower part, the iron ore is in the stage where high moisture caused by heavy rain is beginning to be observed. caused by flooding Figure 8 In the state shown in (a), when the iron ore is unloaded from the transport ship, polyacrylate resin particles are added as a polymeric water absorbing agent, and the addition amount is 1.0 to 2.0% by mass relative to the suspended water inflow.

[0117] The amount of polymer water-absorbing agent that should be added is determined by the following method: Since the suspended water gushing Wm is generated in the depression after digging with a bucket, it is estima...

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Abstract

The invention relates to a method for unloading water-containing bulk materials. This method is an effective method to deal with the water inrush and suspended water inrush inevitably generated when unloading water-containing bulk materials. The method includes: when unloading water-containing bulk materials such as ore and coal from a cargo ship using a bridge crane or a grab bucket (5) of an unloader, a state in which powder particles are suspended in the incoming water is generated during the unloading operation. In the case of suspended water gushing (Wm), a polymer flocculant is added to the suspended water gushing (Wm), so that the gushing water of the suspended water gushing (Wm) and the powder particles are condensed / agglomerated, and then discharged together with the bulk materials.

Description

technical field [0001] The present invention relates to a method of unloading bulk materials containing water for the elimination of intermittent or continuous unloading of ore containing moisture from transport ships, barges, etc. using the buckets of bridge cranes, unloaders or continuous unloaders Unloading failure caused by water gushing when bulk materials such as , coal, etc. Background technique [0002] Most bulk materials such as ore and coal are imported from foreign countries, and are basically transported by ships. Most of these bulk materials, especially ore and coal, have high moisture in recent years. During transportation, the moisture is separated from the bulk materials and accumulated at the bottom of the cabin. As a result, there is a problem that in the middle stage or the second half of the unloading process with an unloader, etc., a dent is formed on the bulk material after being grabbed by a grab bucket for unloading, etc., and not only powder partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65G69/20B65G67/60B63B25/04
CPCB63B25/04B63B27/19
Inventor 衣笠友规早坂祥和大屋宪司
Owner JFE STEEL CORP
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