JP6041627B2 - Method for conveying steelmaking raw material and method for producing solidified ironmaking raw material - Google Patents

Description

  The present invention relates to a method for transporting a steelmaking raw material and a method for producing a solidified ironmaking raw material to improve the handling of a slurryed steelmaking raw material.

  Steelmaking materials are collected on bulk carriers and transported to steelworks. During the transportation, the water contained in the steelmaking materials is collected on the floor of the hold, and the accumulated steelmaking materials are slurried, and the ironmaking material slurry is Form. The steelmaking raw material stacked in the yard is slurried with water for preventing rain or dust to form a steelmaking raw material slurry. As a result, it may be difficult to carry out the steelmaking raw material slurry from the hold or yard. In addition, sludge accumulated in the water treatment pit of an ironworks is mainly composed of iron ore, coal, coke, and iron, so it may be used as an ironmaking raw material. Such sludge is slurried. , It may be difficult to carry out from the pit. Since it is difficult to carry out the slurry-made iron-making raw material using a belt conveyor or the like, the iron-making raw material in the iron-making raw material slurry is carried out by a bucket or the like while draining.

  Examples of the iron-making raw material include fine iron ore having a particle size of less than about 5 mm and massive iron ore having a particle size of more than about 5 mm (see Patent Document 1).

JP 2009-280849 A

  However, carrying out while draining with a bucket or the like has a problem that it takes time and effort. In addition, since it takes time in the sun drying, there is a problem that it is slurried again when it rains.

  This invention is made | formed in view of the above situation, and it aims at providing the conveyance method of the iron-making raw material which improves the handling of an iron-making raw material slurry.

  The present inventors have found that the mixture of the iron-making raw material slurry and the polymer water-absorbing agent is solidified, and have completed the present invention. Specifically, the present invention provides the following method for conveying an iron making raw material.

  (1) The process of solidifying the said iron-making raw material slurry by making a polymeric water-absorbing agent contact with the iron-making raw material slurry containing the iron-making raw material and water formed in the iron-making raw material container. And a method of transporting the iron-making raw material solidified body to the outside of the iron-making raw material container.

  (2) The method for transporting a steelmaking raw material according to (1), wherein at least some of the steps are performed outdoors.

  (3) The method for conveying an iron-making raw material according to (1) or (2), wherein a belt conveyor is used for the conveyance.

  (4) The method for conveying an iron-making raw material according to any one of (1) to (3), wherein the polymer water-absorbing agent is contained in an amount of 0.001 to 2 parts by weight with respect to 100 parts by weight of the iron-making raw material slurry. .

  (5) The method for conveying an iron-making raw material according to any one of (1) to (4), wherein the polymer water-absorbing agent is sodium polyacrylate.

  (6) The method for transporting a steelmaking raw material according to any one of (1) to (5), wherein the steelmaking raw material container is located in a hold.

  (7) including a step of forming an iron-making raw material slurry containing a predetermined amount of iron-making raw material in a space of the iron-making raw material container, and a step of preparing an iron-making raw material solidified body by mixing the iron making raw material slurry and the polymer water-absorbing agent. A method for producing a solidified steelmaking material

  According to the method for conveying a steelmaking raw material provided in the present invention, the handling of the steelmaking raw material slurry is improved.

  Hereinafter, the conveyance method of the iron-making raw material of this invention is demonstrated.

  The method for conveying an iron making raw material of the present invention comprises solidifying the iron making raw material slurry by bringing a polymer water absorbent into contact with the iron making raw material slurry containing the iron making raw material and water formed in the iron making raw material container. A step of making the iron-making raw material solidified body and a step of transporting the iron-making raw material solidified body to the outside of the iron-making raw material container.

(Steel material container)
The iron-making raw material container has a space that can store a predetermined amount of iron-making raw material slurry, and is provided with the iron-making raw material slurry at the bottom.

  The steel making material container is not particularly limited.For example, a large amount of iron making materials such as a yard for storing and storing iron making materials, a ship holding ship for steel making materials, a container or loading platform for transport vehicles, and a warehouse can be used. It may have a space that can be accommodated, or may be a small container that accommodates a small amount of iron-making material. Moreover, it may be a sedimentation basin or a water tank of a water treatment facility in an ironworks. Preferably, it is a yard that needs to accommodate a large amount of iron-making raw material, a ship's hold, a container of a transport vehicle, a warehouse, etc., and particularly preferably a ship's hold, but the size of the space for the iron-making raw material container Is not particularly limited.

(Steel making material solidified)
The iron-making raw material solidified body includes an iron-making raw material and a polymer water-absorbing agent, and the iron-making raw material includes those derived from the iron-making raw material slurry, and is in a gel or solid state, for example, solidified into a lump, granule, or powder Have In addition, the iron-making raw material slurry may contain substances other than the iron-making raw material and the polymer water-absorbing agent.

  The iron-making raw material solidified body is obtained by solidifying the iron-making raw material slurry and the polymer water-absorbing agent, and there is no difficulty in handling as in the case of the iron-making raw material slurry.

  The iron-making raw materials contained in the solidified iron-making raw material are all contained in one iron-making raw material slurry, a mixture of two or more iron-making raw material slurries, and some iron-making raw materials are iron-making raw materials. What was contained in the slurry and other parts were not contained in the iron-making raw material slurry can be used. Since it is easy to handle in terms of the quality of the iron-making raw material solidified body, it is preferable that all of the iron-making raw materials contained in the iron-making raw material solidified body are contained in one iron-making raw material slurry. It may be a raw material.

  The iron-making raw material solidified body of the present invention may be processed as it is in the iron making process, or may be fired and dry-distilled. Since the solidified iron-making material obtained by the present invention has a large contact area with the atmosphere as compared with the slurry-like iron-making material, evaporation of moisture is fast. For this reason, the energy saving effect in a post process is acquired.

(Raw material)
The iron making raw material is not particularly limited, and is iron ore, coal, dust, coke, limestone, or the like, and the shape of the iron making raw material is not particularly limited. Iron ore is preferable because the iron-making raw material solidified body can be easily held and handled, and iron ore is particularly preferably powdered iron ore, but may be massive iron ore or a mixture thereof.

  The amount of the iron-making raw material contained in the iron-making raw material solidified body can be changed depending on the type of the iron-making raw material and the polymer water-absorbing agent, and is not particularly limited as long as the iron-making raw material slurry can be solidified with the polymer water-absorbing agent. .

(Steel making raw material slurry)
The iron-making raw material slurry includes an iron-making raw material and water. The iron-making raw material is as described above, and the water is not particularly limited, but may be water derived from the iron-making raw material, and water sprayed to prevent rain or dust. It may be.

(Polymer water absorbent)
The polymeric water-absorbing agent is a material that has a high water absorption rate and that captures moisture in the molecular structure after water absorption and does not discharge or is difficult to discharge. In the present invention, the polymer water-absorbing agent may be used alone, but may contain other water-absorbing materials such as silica gel, zeolite, activated carbon and other substances.

  The polymer water-absorbing agent is not particularly limited. For example, polyacrylic acid (salt), polyacrylic acid ester, polyacrylamide, polymethacrylic acid (salt), polymethacrylic acid ester, polyalkyleneimine, polyoxyalkylene, polymaleic acid These monomers or copolymers of these monomers with other monomers.

  Polyacrylic acid (salt) monomers are acrylic acid, sodium acrylate, potassium acrylate, ammonium acrylate, etc .; polyacrylic acid ester monomers are methyl acrylate, ethyl acrylate, acrylic acid n -Propyl, n-butyl acrylate, isobutyl acrylate, hydroxyethyl acrylate, -2-ethylhexyl acrylate, etc .; polymethacrylic acid (salt) monomers include methacrylic acid, sodium methacrylate, etc .; polymethacrylic acid Examples of the ester monomer include methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, hydroxyethyl methacrylate, 2-ethylhexyl methacrylate, and the like; monomers of polyalkyleneimine As an ethylene Polyoxyalkylene monomers such as ethylene oxide; and other monomers such as vinyl sulfonic acid, styrene sulfonic acid, acrylamide, methacrylamide, N-ethyl (meth) acrylamide, vinyl pyridine Etc.

  The polymer water-absorbing agent is preferably polyacrylic acid or polyacrylic acid sodium salt, and polyacrylic acid sodium salt is particularly preferred because of its availability and high water-absorbing ability.

  The amount of the polymer water-absorbing agent contained in the iron-making raw material solidified body is not particularly limited because it can be changed depending on the type of the iron-making raw material and the polymer water-absorbing agent, but is, for example, about 0 with respect to 100 parts by mass of the iron-making material slurry. It is preferably contained in an amount of not less than 0.001 part by mass and not more than about 2 parts by mass, and particularly preferably not less than 0.01 part by mass and not more than about 1 part by mass. When the amount of the polymeric water-absorbing agent is about 0.001 part by mass or less with respect to 100 parts by mass of the iron-making raw material slurry, water due to the iron-making raw material cannot be completely absorbed, and the slurrying of the iron-making raw material may not be suppressed. In the case of about 2 parts by mass or more with respect to 100 parts by mass of the raw material slurry, the polymer water-absorbing agent is excessively present, from the viewpoint of the decrease in thermal efficiency and the environment in the subsequent iron making process (sintering, coke, blast furnace). It is not preferable. Note that the amount of the polymeric water-absorbing agent used may be determined based on the estimated value by using a part of the iron-making raw material as a sample, estimating the water content of the entire iron-making raw material.

<Manufacturing method of solid steelmaking material>
The method for producing an iron-making raw material solidified body includes a step of forming an iron-making raw material slurry containing a predetermined amount of iron-making raw material in the space of the iron-making raw material container, and a step of mixing the iron-making raw material slurry and the polymer water-absorbing agent.

  Usually, the polymer water-absorbing agent discharges moisture trapped in its molecular structure by being exposed to ultraviolet rays after water absorption. However, the solidified iron-making material of the present invention does not easily release water trapped in the molecular structure even if it is exposed to ultraviolet rays after water absorption. Therefore, according to the present invention, even if the steelmaking raw material is transported, even if it is exposed to ultraviolet rays, the captured water is discharged and the ironmaking raw material is handled as a solidified ironmaking raw material without causing the steelmaking raw material to become mud or slurry. This makes it easier to handle the steelmaking raw material.

(Formation of steelmaking raw material slurry)
The aspect in which the iron-making raw material slurry is formed in the iron-making raw material container is not particularly limited. For example, the water contained in the iron-making raw material exudes from the iron-making raw material placed in the iron-making raw material container, and naturally stays in the iron-making raw material container. A mode in which a slurry is formed, a mode in which there is rainfall in a state in which the steelmaking raw material is disposed in the ironmaking raw material container, a mode in which the ironmaking raw material is slurried by this rainwater, a steelmaking raw material is disposed in the ironmaking raw material container, As a result of adding moisture for prevention, there are exemplified a mode of slurrying, a mode of removing a supernatant of a water treatment facility (steel making raw material container) of a steel mill, and a mode in which a precipitate containing the iron making raw material is slurried.

(Preparation method for solidified iron raw material)
The method of preparing the iron-making raw material solidified body containing the iron-making raw material slurry and the polymer water-absorbing agent is not particularly limited.For example, after the iron-making raw material slurry is formed, a method of spraying the polymer water-absorbing agent from the upper part of the space, A method of spraying at the bottom is mentioned. The mixing method is not particularly limited, and examples thereof include a method of mechanically mixing using a stirrer and the like, and a method of artificially mixing using an excavator and the like.

  The iron-making raw material solidified body is formed as long as the iron-making raw material slurry is in contact with the polymer water-absorbing agent, and the state of contact is not particularly limited. Therefore, the method for forming the iron-making raw material solidified body is not particularly limited. For example, the iron-making raw material slurry and the polymer water-absorbing agent may be left in contact with each other, or may be stirred and mixed. Good. Further, the mixture may be alternately stirred and allowed to stand. In order to rapidly solidify the steelmaking raw material slurry, it is preferable to stir the mixture, but there is no particular limitation.

  In the present invention, “solidification” refers to a state in which the slurry is solidified into a lump, granule, or powder to the extent that it can be conveyed by a belt conveyor or a truck. In this state, water may be included. Absent.

(Conveying method of steelmaking raw materials)
The method for transporting the iron-making raw material may be mechanical or manual. Examples of the method of mechanically transporting include a method of using a belt conveyor, a truck, or the like. Since it can be transported in a large amount at a time for a long distance, it is preferably transported mechanically, particularly preferably transported using a belt conveyor.

Conventionally, when a polymer water-absorbing agent is used outdoors, the polymer water-absorbing agent is easily affected by ultraviolet rays, and there has been a problem of separating moisture absorbed in a few minutes to hours. Even if it is exposed to ultraviolet rays outdoors, it can be handled stably without releasing the captured water.
This is considered because the influence of the ultraviolet rays on the polymer water-absorbing agent is reduced by the iron oxide shielding or scattering the ultraviolet rays.

  EXAMPLES Hereinafter, although this invention is demonstrated using an Example, this invention is not restrict | limited to an Example.

(Confirmation of solidification effect)
[Examples 1 to 3, Comparative Examples 1 to 4]
120 g of water was added to a stainless steel pallet containing 1140 g of iron ore having a moisture content of 7% by mass to produce 1260 g of iron ore slurry having a moisture content of 16%.
The iron ore slurry was put into a mortar mixer (capacity 3 L), and predetermined amounts of various chemicals and the iron ore slurry were stirred and mixed for 3 seconds.
After stirring and mixing, the mixture of the iron ore slurry and the polymer water-absorbing agent was transferred to a stainless steel pallet, and after 15 minutes, the solidified slurry was further stirred for 10 seconds.
The solidified body was taken out from the pallet, and the table flow value (the number of drop impacts: 0) was measured according to JIS R-5201. Specifically, the sample was packed in a flow cone correctly placed in the center on the flow table, and immediately after that, the flow cone was correctly removed upward to measure the flow value.
The flow value after turning the handle and dropping the table a predetermined number of times was measured.
With reference to the physical property test of cement according to JIS R 5201, the fluidity of the iron ore solidified body was evaluated.

The amount of water contained in the iron ore was determined by the following method.
First, the mass of about 20 g of iron ore before drying was measured, and the iron ore was dried in a dryer at 105 ° C. for 2 hours. Two hours later, the mass of the iron ore was measured, and the moisture content was calculated by the calculation method of “moisture content = (mass before drying−mass after drying) ÷ mass before drying × 100”.
As the polymer water-absorbing agent, CLILINE S-200 (manufactured by Kurita Kogyo), which is a polyacrylic acid polymer, was used. As other drugs, silica gel (manufactured by Tokai Chemical Industry Co., Ltd.), guar gum (average molecular weight of about 300,000), and carboxymethyl cellulose (average molecular weight of about 30,000) were used. The results are attached in Table 1.

Even if the mixing time of the chemical | medical agent and a slurry is short like this time, if Kuriline S-200 is in contact with water, it will exhibit a water absorption effect and will solidify. As a result, the flow value when the number of drop impacts was 0 was small, the fluidity of the slurry was lowered, and a solidification effect was observed. In the comparative example, the solidification effect was the same result as no drug addition (blank).
Furthermore, when the number of drop impacts was 15 and 50 times, the one with a flow value of 110 mm or less was particularly solidified in iron ore, and was in a stable state in the form of aggregates. It was.

(Confirmation of the influence of ultraviolet rays)
The solidified body according to Example 2 in which the solidification effect of the iron ore slurry was confirmed and the polymer water-absorbing agent having absorbed pure water were placed on a pallet, exposed to ultraviolet rays outdoors, and the appearance change was observed and evaluated. . The polymer water-absorbing agent in which the pure water of Comparative Example 2 was absorbed was prepared using the same amount of water and criline S-200 as water / criline S-200 used for confirming the solidification effect of the iron ore slurry.
The solidified iron ore slurry and the polymer water-absorbing agent having absorbed pure water were prepared by hand so as to form a lump on the pallet and exposed to ultraviolet rays. Table 2 shows the evaluation results of the appearance after 30 minutes, 1 hour and 1 day after the start of exposure.

  The iron ore solidified body of the example maintained the same shape as that at the start of exposure to ultraviolet rays. The polymer water-absorbing agent that simply absorbed water released water after 30 minutes and had an appearance similar to water after 1 hour. It is considered that the ultraviolet shielding effect or ultraviolet scattering effect of iron ore was exhibited.

Claims (6)

A step of solidifying the iron-making raw material slurry into an iron-making raw material solidified body by bringing a polymer water absorbent into contact with the iron-making raw material slurry containing the iron-making raw material and water formed in the iron-making raw material container;
The formulation of iron material solidified body, and a step of conveying the steel material accommodating extracorporeal seen including,
A method for conveying an iron making raw material using a belt conveyor for the conveyance. A step of solidifying the iron-making raw material slurry into an iron-making raw material solidified body by bringing a polymer water absorbent into contact with the iron-making raw material slurry containing the iron-making raw material and water formed in the iron-making raw material container;
Transporting the iron-making raw material solidified body out of the iron-making raw material container,
A method for transporting an iron making raw material using a truck for the transport. The method for conveying a steelmaking raw material according to claim 1 or 2 , wherein at least a part of the steps is performed in an outdoor exposure state.   The method for conveying an iron-making raw material according to any one of claims 1 to 3, wherein the polymer water-absorbing agent is contained in an amount of 0.001 to 2 parts by mass with respect to 100 parts by mass of the iron-making raw material slurry.   The method for conveying an iron-making raw material according to any one of claims 1 to 4, wherein the polymer water-absorbing agent is polyacrylic acid sodium salt. The method for conveying an iron-making raw material according to any one of claims 1 to 5, wherein the iron-making raw material container is located in a hold.