WO2009082093A2

WO2009082093A2 - Method for mixing iron and steel raw material

Info

Publication number: WO2009082093A2
Application number: PCT/KR2008/006985
Authority: WO
Inventors: Kicheul Yoon; Younghun Koh; Myoungsig Kim
Original assignee: Hyundai Steel Company
Priority date: 2007-12-24
Filing date: 2008-11-27
Publication date: 2009-07-02
Also published as: KR101003272B1; CN101678972A; WO2009082093A3; KR20090069137A; CN101678972B

Abstract

A method for mixing iron and steel raw material includes a process of stacking a raw material that forming a raw material pile by sequentially stacking a first raw material mixture block and a second raw material mixture block formed by discharging raw materials from a plurality of bins and mixing the raw materials and a process of mixing raw materials that separates and mixes a portion of the first raw material mixture block with a portion of the second raw material mixture block at a side of the raw material pile that is stacked by the process of stacking a raw material pile, in which a plurality of raw material piles are stacked in series by repeating the process of stacking a raw material pile such that a portion, where an angle of repose is created, of any one raw material pile covers a portion, where an angle of repose is created, of the next raw material pile.

Description

Description METHOD FOR MIXING IRON AND STEEL RAW MATERIAL

Technical Field

[1] The present invention relates to a method for mixing iron and steel raw materials, more particular, to efficiently stacking raw material mixture of a plurality of raw materials in a small space. Background Art

[2] In general, a variety of raw materials for removing impurities in a hot metal and determining properties of iron are used as raw materials for iron manufacturing, in addition to iron ore.

[3] Raw mixture that is made by mixing a plurality of raw materials in a predetermined ratio, depending on the kind of iron that will be manufactured, is used.

[4] According to the above method of mixing raw materials, bins corresponding to the number of kinds of raw materials are provided and the raw materials are stored, and then a plurality of raw materials, of which the amount corresponds to the mixing ratio, is discharged from each bin and mixed to be used.

[5] However, since ten to fourteen or more kinds of raw materials are generally mixed for iron manufacturing, bins corresponding to the number of kinds of raw materials for iron manufacturing should be prepared, such that there was a problem in that high cost and large space are required.

[6] Further, even if bins corresponding to the number of raw materials, which are in use now, are provided, additional bins are required to add raw materials for improving properties of iron. In addition, if the space for installing the bins is insufficient, the bins cannot be installed and a new apparatus for mixing raw materials should be designed. Disclosure of Invention Technical Problem

[7] It is an object of the present invention to provide a method for mixing iron and steel raw materials that makes it possible to efficiently mix a plurality of raw materials in a small space and increase availability of the raw material piles.

Technical Solution

[8] A method for mixing iron and steel raw materials according to the present invention includes: a process of stacking a raw material pile including a first step of forming a first raw material mixture block by stacking raw materials after discharging the raw material from a plurality of bins and mixing the raw materials and a second step of forming a second raw material mixture block by stacking raw materials on the first raw material mixture block after discharging the raw materials from a plurality of bins and mixing the raw materials; and a process of mixing raw materials that separates and mixes a portion of the first raw material mixture block with a portion of the second raw material mixture block at a side of the raw material pile that is stacked by the process of stacking a raw material pile, in which a plurality of raw material piles are stacked in series by repeating the process of stacking a raw material pile and the process of mixing raw materials such that a portion, where an angle of repose is created, of any one raw material pile covers a portion, where an angle of repose is created, of the next raw material pile.

Advantageous Effects

[9] The present invention is advantageous in that it is possible to reduce a space for installing an apparatus for mixing because it is possible to simply mix raw materials at a desired mixing ratio for iron manufacturing, using smaller number of bins than the number of kinds of raw materials. Further, the present invention is advantageous in that it is possible to simply mixing raw materials at a desired mixing ratio even if other kinds of raw materials are added. [10] Further, the present invention has an advantage of improving availability of the space for stacking raw material piles by forming the raw material piles in series and increasing workability of mixing by continuously mixing the raw materials.

Brief Description of Drawings [11] FIGS. 1 to 3 are views sequentially illustrating a process of stacking a raw material pile according to the present invention. [12] FIGS. 4 to 5 are views illustrating an example of forming raw material piles in series by repeating the process of stacking a raw material pile according to the present invention. [13] FIG. 6 is a perspective view showing a raw material pile by repeating the process of stacking a raw material pile according to the present invention. [14] FIG. 7 is a perspective view illustrating a process of mixing raw materials according to the present invention. [15] FIGS. 8 and 9 are schematic views illustrating other examples of a process of mixing raw materials according to the present invention. [16] FIG. 10 is a perspective view showing an apparatus for stacking raw materials that is used the present invention. [17] FIG. 11 is a schematic view showing an apparatus for stacking raw materials that is used in the present invention.

Best Mode for Carrying out the Invention [18] Preferred embodiments of the present invention are described hereafter with reference to the accompanying drawings. [19] FIGS. 1 to 3 are views sequentially illustrating a process of stacking a raw material pile according to the present invention, in which FIG. 1 illustrates a first step of forming a block of first raw material mixture on the floor, FIG. 2 illustrates a second step of forming a block of second raw material mixture on the first raw material mixture, and FIG. 3 illustrates a third step of forming a third raw material mixture on the second raw material mixture.

[20] FIGS. 4 to 5 are views illustrating an example of forming raw material piles in series by repeating the process of stacking a raw material pile according to the present invention, in which a portion of any one raw material pile where an angle of repose is created covers a portion of the next raw material pile where an angle of repose is created.

[21] FIG. 6 is a perspective view showing a raw material pile by repeating the process of stacking a raw material pile according to the present invention, in which an example of raw material piles in series which are formed by repeating the process of stacking a raw material pile is illustrated.

[22] FIG. 7 is a perspective view illustrating a process of mixing raw materials according to the present invention, in which an example of uniformly separating portions of the first raw material block, the second raw material block, and the second material block, using a separating plate inclined to correspond to the angles of repose of the raw material piles.

[23] FIGS. 8 and 9 are schematic views illustrating other examples of a process of mixing raw materials according to the present invention, in which an example of first removing a portion of which the components are unstable from an end of a raw material pile using the separating plate having a slope corresponding to the angle of repose and then separating the portion where the raw materials are mixed using the separating plate.

[24] FIG. 10 is a perspective view showing an apparatus for stacking raw materials that is used the present invention and FIG. 11 is a schematic view showing an apparatus for stacking raw materials that is used in the present invention, in which the apparatus for stacking raw materials can form raw material piles in series in a circular shape.

[25] As shown in FIGS. 1 to 3, in order to form a raw material pile P, the present invention includes a first step of stacking a first raw material mixture block 1 on the floor and a second step of stacking a second raw material mixture block 2 on the first raw material mixture block 1, and may further include a third step of stacking a third raw material mixture block 3 on the second raw material mixture block 2.

[26] Further, though not shown, a step of stacking a fourth raw material block on the third raw material mixture block 3 may be further included, and it should be understood that any type of raw material pile P is included in the present invention as long as it can formed by stacking raw material mixture block in a plurality of steps to achieve a desired mixing ratio of the raw materials.

[27] The first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 are formed by stacking raw material mixture, which is obtained by mixing raw materials discharged from a plurality of bins storing the raw materials, in which the raw materials discharged from the bins may be mixed at the same mixing ratio, at different mixing ratios, or two are formed at the same mixing ratio and the other one may be mixed at a different mixing ratio.

[28] The first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 are formed at a mixing ratio that is set such that portions separated from the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 are mixed at the finally desired mixing ratio, which can be changed to have various values.

[29] For example, in order to form the final raw material mixture by mixing fourteen raw materials (A, B, C, D, E, F, G, H, I, J, K, L, M, N) at a predetermined mixing ratio using seven bins, different raw materials (A, B, C, D, E, F, G) are stored in the seven bins at a predetermined mixing ratio, the raw materials are discharged and raw material mixture formed by mixing the raw materials is stacked on the floor to form the first raw material mixture block 1, the other raw materials (H, I, J, K, L, M, N) are stored in the seven bins at a predetermined mixing ratio, and then the raw materials are discharged and raw material mixture formed by mixing the raw materials are stacked on the first raw material mixture block 1 to form the second raw material mixture block 2.

[30] Thereafter, the finally desired mixing ratio is achieved by a process of mixing raw materials that separates and mixes portions of the first raw material mixture block 1 and the second raw material mixture block 2.

[31] According to another example different from the above example, in order to form the final raw material mixture by mixing fourteen raw materials (A, B, C, D, E, F, G, H, I, J, K, L, M, N) at a predetermined mixing ratio using six bins, different raw materials (A, B, C, D, E, F) are stored in the six bins at a predetermined mixing ratio, the raw materials are discharged and raw material mixture formed by mixing the raw materials is stacked on the floor to form the first raw material mixture block 1, other raw materials (D, E, F, H, I, J) are stored again in the six bins at predetermined mixing ratio, and then the raw materials are discharged and raw material mixture formed by mixing the raw materials are stacked on the first raw material mixture block 1 to form the second raw material mixture block 2. Further, other raw materials (H, I, J, K, L, M, N) are, thereafter, stored again in the six bins at predetermined mixing ratio and then the raw materials are discharged and raw material mixture formed by mixing the raw materials are stacked on the second raw material mixture bock 2 to form the third raw material mixture block 3.

[32] Thereafter, the finally desired mixing ratio is achieved by a process of mixing raw materials that separates and mixes portions of the first raw material mixture block 1, the second raw material mixture block 2, and the third raw material mixture block 3.

[33] When the finally desired mixing ratio is achieved by a plurality of bins as described above, mixing the raw materials discharged from the bins is set by the finally desired mixing ratio, which can be variously changed according to the number of bin, the kind and number of raw materials for mixing, and the mixing ratios of the raw materials.

[34] Meanwhile, a plurality of raw material piles P are formed by repeating the process of stacking a raw material that form a raw material pile P from a plurality of stacked raw material blocks as shown in FIG. 4, including the first step and the second step, in which the raw material piles P are formed in series.

[35] Further, as shown in FIG. 5, a portion where the angle of repose is created is formed at the front and rear of the first raw material block 1 in the first step and a portion where the angle of repose is created is formed at the front and rear of the second raw material block 2 in the second step, while the second raw material block 2 is stacked such that the angles of repose continues the angles of repose of the first raw material block 1 in the second step.

[36] Further, a portion of any one raw material pile P where an angle of repose is created covers a portion of the next raw material pile where an angle of repose is created.

[37] That is, when the second raw material pile P is stacked by repeating the process of stacking a raw material pile after the first raw material pile P including the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block by the process of stacking a raw material pile including the first step, second step, and third step, the front portion with the angle of repose of the first raw material mixture block 1 is formed to cover the rear portion with the angle of repose of the first raw material mixture block 1 of the first raw material pile P in the first step, the front portion with the angle of the second raw material mixture block 2 is formed to cover the rear portion with the angle of repose of the second raw material mixture block 2 of the first raw material pile P in the second step, and the front portion with the angle of repose of the third raw material mixture block 3 is formed to cover the rear portion with the angle of repose of the third raw material mixture block 3 of the first raw material pile P in the third step.

[38] Further, in the following processes of stacking a raw material pile, it is preferable to stack each first raw material mixture block 1 at a predetermined height in the first step, the second raw material mixture block 2 at a predetermined height in the second step, and the third raw material mixture block 3 at a predetermined height in the third step. [39] This makes it possible to maintain the mixing component ratio when continuously repeating the process of mixing raw materials after separating portions of the first raw material mixture block 1 and second raw material mixture block 2 with a portion of the third raw material mixture block 3.

[40] On the other hand, it is preferable to stack a plurality of raw material piles P, which is formed by repeating the process of stacking a raw material pile as described above, in a series in a circular shape, as shown in FIG. 6, to efficiently use the space for the stacked piles.

[41] The raw material piles P are formed in series in the circular shape by the process of stacking a raw material pile P, the process of mixing raw materials, which separates and mixes portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block, is applied sequentially from the front portion of the raw material pile P stacked by the first process of stacking a raw material pile.

[42] According to the process of mixing raw materials, as shown in FIG. 7, portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block are uniformly scraped off by moving a harrow 60, which is inclined corresponding to the angle of repose, from one side to the other side of the raw material pile P, the portions scraped on the floor are carried to a discharging hopper 40 by a bridge scraper 50, which is described below, and then discharged outside by an out-conveyor 70 and mixed, which is described below in detail.

[43] In addition to the above example, though not shown in the figures, portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block can by uniformly separated and mixed by inserting a separating plate inclined corresponding to the angle of repose from the upper portion to the lower portion of an end of the raw material pile P such that the lower end contacts with the floor, and then moving it to an end of the raw material pile P, in which any separating means including the harrow 60 and the separating plate.

[44] The process of mixing raw materials includes, as shown in FIGS. 8 and 9, a first separating step of making straight the portion with the angles of repose by removing the curved portions at the angle of repose from the front portion with the angle of repose of the raw material pile P using the harrow 60 inclined at an angle corresponding to the angle of repose, and a second separating step of uniformly separating and mixing portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 using the harrow 60 inclined at an angle corresponding to the angle of repose after the first separating step.

[45] That is, the portion of the raw material pile P where the angle of repose is created is not uniform in angle of repose at the end and non-uniformly curved, such that, in this shape, separating portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 may make the mixing ratio unstable. Therefore, it is possible to continuously and uniformly obtain the desired final raw material mixture by repeating the second separating step after removing the portions with the unstable mixing ratio.

[46] Further, the raw material piles P are stacked in the circular shape by repeating the process of stacking a raw material pile and portions of the raw material piles P are cut in a circular shape by repeating the process of mixing raw materials, such that stacking and mixing are efficiently performed in a small space by circularly repeating the process of stacking a raw material pile and the process of mixing raw materials.

[47] The method of stacking the raw material piles P in a circular shape as described above and basically uses the apparatus for stacking and reclaiming raw materials shown in FIGS. 10 and 11, while it should be understood that apparatuses for stacking raw materials having various structures can be used.

[48] The apparatus for stacking and reclaiming raw materials includes:

[49] a base column 10 that stands at the center in a dome having a space where raw materials are stacked;

[50] an inputting unit 20 that is disposed above the base column 10 and includes an in- con veyor 21 that inputs raw materials, which are discharged from a plurality of bins an d mixed, from the outside into the dome;

[51] a stacker 30 that is rotatably attached to the base column 10 under the inputting unit

20 and carries and stacks the raw materials discharged from the inputting unit 10 to form a raw material pile P;

[52] a discharging hopper 40 that is embedded under the base column 10 and stores the raw materials;

[53] a bridge scraper 50 that is rotatably attached to the lower portion of the base column

10 and has a scraping means which inputs the raw materials on the floor into the discharging hopper 40 while moving along a track;

[54] a harrow 60 that is inclined at an angle at a side of the bridge scraper to correspond to the angle of repose and reciprocates in the longitudinal direction of the bridge; and

[55] an out-conveyor 70 that discharges the raw material in the discharging hopper 40 to the outside.

[56] The base column 10, though not shown, includes a first rotary shaft for rotating the stacker 30 and a second rotary shaft for rotating the bridge scraper 50, and the stacker 30 and the bridge scraper 50 are rotated by motors, which are not shown.

[57] The inputting unit 20 is a device that carries raw material mixture, which is formed by discharging and mixing the raw materials stored in the bins at the outside of the circular dome, into the dome using the in-con veyor 21, and mixing the raw materials was described above and detailed description is not provided.

[58] The stacker 30 includes a stacking conveyor 31 radially protruding from the base column 10, is attached to the base column 10 such that the end can rotate up/down and provided with a balance weight 32 to maintain balance with the stacking conveyor 31 protruding in one direction from the opposite end of the stacking conveyor 31.

[59] The stacking conveyor 31 is disposed rotatably up/down to stacking the mixed raw materials while rotating about the base column 10.

[60] That is, the raw material mixture carried in the circular dome by the inputting unit 20 is stacked on the floor by the stacker 30, such that the first raw material mixture bock 1 is formed.

[61] Further, the second raw material mixture block 2 and the third raw material mixture block 3 are sequentially stacked on the first raw material mixture block to form one raw material pile P by repeating the inputting and stacking processes, and the plurality of raw material piles P are formed in series in a circular shape while the inputting unit 20 and the stacker 30 rotate about the base column 10.

[62] Further, after the raw material piles P are formed in the circular shape, the process of mixing that separates and mixes portions of the first raw material mixture block 1, and second raw material mixture block 2, and third raw material mixture block 3 in the stacked raw material pile P is performed simultaneously with the process of stacking a raw material pile P.

[63] According to the process of mixing raw materials, portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 are separated by moving a harrow 60, which is provided in the bridge scraper 50 rotating along the base column 10, from one side to the other side of the bridge scraper 50, i.e. from the inside to the outside of the circular raw material pile, in which the harrow 60 is inclined corresponding to the angle of repose and the portions of the first raw material mixture block 1, second raw material mixture block 2, and third raw material mixture block 3 are scraped off onto the floor.

[64] The raw materials scraped on the floor are inputted to a discharging hopper 40 by the scrapping means of the bridge scraper 50, and then the raw materials inputted to the discharging hopper 40 is loaded to the out-conveyor 70 and discharged outside.

[65] Further, after the process of mixing raw materials is once performed, the bridge scraper 50 repeatedly operates while moving along the base column 10, such that the process of stacking raw materials and the process of mixing raw materials are circularly repeated.

[66] Although the method for mixing iron and steel raw materials according to the present invention can also be applied to raw material piles P that are stacked outside the house, it is preferable to stack raw material piles to the outside of the house to improve the quality of iron and steel raw materials without being affected by the external environments.

[67] The present invention is not limited to the above embodiments and may be variously modified within the aspect of the present invention, and it should be understood that the modifications are included in the scope of the present invention.

[68]

Claims

[1] A method for mixing iron and steel raw materials, comprising: a process of stacking a raw material pile including a first step of forming a first raw material mixture block by stacking raw materials after discharging the raw material from a plurality of bins and mixing the raw materials and a second step of forming a second raw material mixture block by stacking raw materials on the first raw material mixture block after discharging the raw materials from a plurality of bins and mixing the raw materials; and a process of mixing raw materials that separates and mixes a portion of the first raw material mixture block with a portion of the second raw material mixture block at a side of the raw material pile that is stacked by the process of stacking a raw material pile, wherein a plurality of raw material piles are stacked in series by repeating the process of stacking a raw material pile such that a portion, where an angle of repose is created, of any one raw material pile covers a portion, where an angle of repose is created, of the next raw material pile.

[2] The method for mixing iron and steel raw materials according to claim 1, wherein the plurality of raw material piles that are stacked in series by repeating the process of stacking a raw material pile are stacked in series in a circular shape.

[3] The method for mixing iron and steel raw materials according to claim 1, wherein each of the first raw material mixture blocks are stacked at a predetermined height in the first step and each of the second raw material mixture blocks are stacked at a predetermined height in the second step, in repeating the process of stacking a raw material pile.

[4] The method for mixing iron and steel raw materials according to claim 1, wherein a portion of the first raw material mixture block and a portion of the second raw material mixture block are separated by a separating means that is inclined corresponding to the angle of repose, and the separated portion of the first raw material mixture block and the separated portion of the second raw material mixture block are mixed, in the process of mixing raw materials.

[5] The method for mixing iron and steel raw materials according to claim 1, wherein the process of mixing raw materials includes a first separating step of making straight the portion with the angle of repose at the front portion of the raw material pile by removing the curved portion using a separating means inclined at an angle corresponding to the angle of repose, and a second separating step of separating and mixing portions of the first raw material mixture block with the second raw material mixture block using a separating means inclined at an angle corresponding to the angle of repose after the first separating step.