Apparatus for recovering iron from slag

Abstract

The present invention relates to an apparatus for recovering iron from slag, comprising: a support frame (1); a rotary drum (2) provided to rotate in the support frame (1); a driving means (3) formed at one side of the support frame (1) so as to rotate the rotary drum (2); a raw material input part (4) formed at one side of the rotary drum (2) so that low-purity iron recovered from steel slag is continuously put into the rotary drum (2); a pickling solution treatment part (5) formed at the other side of the rotary drum (2) so that a pickling solution is injected into the rotary drum (2), thereby reacting with the iron put into the rotary drum (2); and a control part (6) for controlling the operations of the driving means (3), the raw material input part (4) and the pickling solution processing part (5). According to the present invention, the low-purity iron recovered from steel slag is continuously put into the rotary drum, is pickled through the pickling solution supplied into the rotary drum, and then is automatically discharged, and thus continuity, efficiency and productivity of iron-pickling work can be improved.

Description

Iron recovery device from slag

[0001] The present invention relates to an iron recovery device from slag, and more particularly, to an iron recovery device from slag that can improve the continuity, efficiency, and productivity of iron pickling work by continuously feeding low-purity iron recovered from ironmaking slag into a rotating drum, pickling it using a pickling solution supplied into the rotating drum, and then automatically discharging it.

[0002] The steel industry consumes large amounts of raw materials and energy to produce steel, and through a complex chain of production processes including raw materials, iron making, steel making, and rolling, it generates a large amount of various byproducts and waste.

[0003] These by-products and wastes amount to 65% of the main product, steel, and of these, about 80% of the solid by-products and wastes are slag, and the remainder are generated in the form of dust or sludge.

[0004] Generally, slag generated in steel mills is broadly divided into blast furnace slag generated in the blast furnace process and steelmaking slag generated in the steelmaking process.

[0005] In addition, there are pretreatment slag generated in the pretreatment process of steelmaking, slag generated during oxidation and reduction in electric furnaces, and refining furnace slag in the stainless steelmaking process.

[0006] The slag discharged in this way contains a large amount of iron, and while the iron contained in the slag can be usefully used as a raw material for steel if recovered, it is difficult to find a special use for the slag itself, so the iron is recovered from the slag and the remaining slag is landfilled or used for other purposes.

[0007] Meanwhile, as a method for recovering iron from slag, the method mainly used is to crush the slag to separate the slag and iron, taking advantage of the property that the mineral slag and the metal iron do not adhere easily, and then attach the iron to a magnetic separator to separate them.

[0008] However, there was a problem that the iron recovered through this method of recovering iron using a magnetic separator contained a large amount of impurities, including sulfur, and thus the purity and quality of the iron were low, making it difficult to use it as a raw material for high-quality steel products.

[0009] Thus, a cleaning device has been developed that can obtain high-purity iron by removing various impurities contained in low-purity iron by pickling low-purity iron selected using a magnetic separator, etc. with a pickling solution.

[0010] However, conventional iron cleaning equipment has the problem of taking a long time to discharge low-purity iron recovered from slag by putting it into a pickling tank containing pickling liquid and then pickling the low-purity iron, which results in low productivity.

[0011] In addition, conventional iron cleaning equipment mainly uses a hydrochloric acid mixture with a concentration of 5 to 20 wt% as the pickling liquid supplied to the pickling tank. However, when the pickling of low-purity iron is completed, the pickling liquid contains various impurities, which lowers the concentration of hydrochloric acid, thereby lowering the pickling efficiency. Therefore, the 'spent hydrochloric acid' with a lowered concentration is mainly disposed of. This not only incurs a cost burden, but also has the problem of being unfriendly as secondary pollutants are generated during the disposal process of the spent hydrochloric acid.

[0012] In addition, after the iron that has been put into the pickling tank has been pickled, the conventional iron cleaning device discharges the iron that has been pickled, along with the spent hydrochloric acid with a reduced concentration, and then supplies new pickling solution to the pickling tank again, and then pickles the iron that has been put back into the pickling tank. This makes continuous pickling difficult, which not only reduces productivity, but also increases the cost of pickling as the amount of hydrochloric acid that is the raw material for the pickling solution increases.

[0013] In order to solve the conventional problems as described above, the present invention aims to provide an iron recovery device from slag in which low-purity iron recovered from ironmaking slag is continuously fed into a rotating drum, pickled using a pickling solution supplied into the rotating drum, and then automatically discharged.

[0014] In addition, the present invention aims to provide an iron recovery device from slag that filters the waste acid solution discharged after acid washing and automatically adjusts its concentration to enable reuse.

[0015] In order to achieve the above-described purpose, the device for recovering iron from slag of the present invention comprises: a support frame (1); a rotary drum (2) rotatably installed on the support frame (1); a driving means (3) formed on one side of the support frame (1) to rotate the rotary drum (2); a raw material input unit (4) formed on one side of the rotary drum (2) to continuously input low-purity iron recovered from ironmaking slag into the rotary drum (2); an acid solution treatment unit (5) formed on the other side of the rotary drum (2) to inject an acid solution into the rotary drum (2) to react with the iron input into the rotary drum (2); and a control unit (6) for controlling the operations of the drive means (3), the raw material input unit (4), and the acid solution treatment unit (5).

[0016]

[0017] In one embodiment of the present invention, the rotary drum (2) is characterized by having a cylindrical shape lying horizontally, an inlet (201) for inputting iron is formed at the front end, an outlet (202) for outputting iron is formed at the end, and a spiral transfer screw (203) for transferring iron input into the inlet (201) to the outlet (202) is formed on the inner circumference.

[0018]

[0019] In one embodiment of the present invention, the driving means (3) is characterized by including a driving motor (301) for generating driving force; a chain sprocket (302) formed on the outer surface of the rotating drum (2); a roller chain (303) connecting the driving motor (301) and the chain sprocket (302) to rotate the rotating drum (2) with the driving force generated by the driving motor (301); and a guide roller (304) that is installed to rotate on the support frame (1) and guides the rotation of the rotating drum (2) while coming into contact with the outer surface of the rotating drum (2).

[0020]

[0021] In one embodiment of the present invention, the raw material input unit (4) is characterized by including a supply conveyor (401) through which low-purity iron recovered from ironmaking slag is supplied; and a supply hopper (402) having an opening / closing shutter (402a) linked to the supply conveyor (401) to supply iron supplied through the supply conveyor (401) into the interior of a rotating drum (2).

[0022]

[0023] In one embodiment of the present invention, the pickling solution treatment unit (5) is characterized by including a filtering unit (51) for filtering the spent pickling solution discharged from the rotary drum (2); a spent pickling solution storage unit (52) for storing the spent pickling solution from which foreign substances have been filtered in the filtering unit (51); a hydrochloric acid storage unit (53) for storing high-concentration hydrochloric acid as a raw material for the pickling solution; a water storage unit (54) for storing water used for producing the pickling solution; a pickling solution concentration control unit (55) for mixing the spent pickling solution discharged from the spent pickling solution storage unit (52), the hydrochloric acid storage unit (53), and the water storage unit (54), the hydrochloric acid, and the water; and a pickling solution storage unit (56) for storing the pickling solution discharged from the pickling solution concentration control unit (55).

[0024]

[0025] In one embodiment of the present invention, the spent acid tax storage unit (52) is characterized by including a spent acid tax storage tank (521) in which spent acid tax is stored; a spent acid tax concentration measuring means (522) for measuring the concentration of the spent acid tax stored in the spent acid tax storage tank (521) and providing the measured value to the control unit (6); a spent acid tax discharge valve (523) for controlling the discharge of the spent acid tax stored in the spent acid tax storage tank (521); and a spent acid tax discharge amount measuring means (524) for measuring the discharge amount of the spent acid tax discharged through the spent acid tax discharge valve (523) and providing the measured value to the control unit (6).

[0026]

[0027] In one embodiment of the present invention, the hydrochloric acid storage unit (53) is characterized by including: a hydrochloric acid storage tank (531) in which high-concentration hydrochloric acid is stored; a hydrochloric acid discharge valve (532) that controls discharge of the high-concentration hydrochloric acid stored in the hydrochloric acid storage tank (531); and a hydrochloric acid discharge amount measuring means (533) that measures the discharge amount of the high-concentration hydrochloric acid discharged through the hydrochloric acid discharge valve (532) and provides the measured value to the control unit (6).

[0028]

[0029] In one embodiment of the present invention, the water storage unit (54) is characterized by including a water storage tank (541) in which water supplied through the water supply unit (54) is stored; a water discharge valve (542) that controls the discharge of water stored in the water storage tank (541); and a water discharge amount measuring means (543) that measures the discharge amount of water discharged through the water discharge valve (542) and provides the measured value to the control unit (6).

[0030]

[0031] In one embodiment of the present invention, the acid solution concentration control unit (55) is characterized by including: an acid solution concentration control tank (551) in which the acid solution discharged from the spent acid solution storage unit (52), the hydrochloric acid storage unit (53), and the water storage unit (54) and the hydrochloric acid and the water are mixed; an acid solution concentration measuring means for measuring the concentration of the acid solution whose concentration has been adjusted in the acid solution concentration control tank (551) and providing the measured value to the control unit (6); an acid solution discharge valve (553) for controlling the discharge of the acid solution whose concentration has been adjusted in the acid solution concentration control tank (551); and an acid solution discharge amount measuring means (554) for measuring the discharge amount of the acid solution whose concentration has been adjusted discharged through the acid solution discharge valve (553) and providing the measured value to the control unit (6).

[0032]

[0033] In one embodiment of the present invention, the pickling solution storage unit (56) is characterized by including: a pickling solution storage tank (561) in which the pickling solution discharged from the pickling solution concentration control unit (55) is stored; a pickling solution supply valve (562) that controls the pickling solution stored in the pickling solution storage tank (561) to be supplied to a rotary drum (2); a pickling solution supply amount measuring means (563) that measures the supply amount of the pickling solution supplied through the pickling solution supply valve (562) and provides the measured value to the control unit (6); and a pickling solution supply pump (564) that supplies the pickling solution stored in the pickling solution storage tank (561) to the inside of the rotary drum (2).

[0034]

[0035] In one embodiment of the present invention, the acid solution storage unit (56) is characterized in that it further includes an acid solution heating means (565) for heating the acid solution passing through the acid solution supply valve (562).

[0036]

[0037] In one embodiment of the present invention, the acid treatment unit (5) is characterized by further including a acid bath (57) in which acid is contained within and a rotary drum (2) is rotated while partially submerged in the contained acid.

[0038] The iron recovery device from slag of the present invention has the effect of greatly improving the continuity, efficiency and productivity of iron pickling work for producing high-purity iron by continuously feeding low-purity iron recovered from ironmaking slag into a rotating drum, pickling it using a pickling solution supplied into the rotating drum, and then automatically discharging it.

[0039] In addition, by filtering the waste acid solution discharged after acid washing and automatically adjusting the concentration so that it can be reused, the amount of hydrochloric acid used and the amount of waste hydrochloric acid generated are reduced, which significantly improves economic efficiency by reducing the costs of purchasing hydrochloric acid and disposing of waste hydrochloric acid.

[0040] In addition, by maintaining the concentration of the pickling solution constant during the continuous pickling process, there is also an effect of stably maintaining the pickling efficiency and the purity and quality of the pickled iron.

[0041] Figure 1 is an exemplary diagram showing a configuration according to a first embodiment of the present invention.

[0042] Figure 2 is a cross-sectional view illustrating a rotary drum according to a first embodiment of the present invention.

[0043] Figure 3 is a cross-sectional view showing a manufacturing process according to a second embodiment of the present invention.

[0044] Figure 4 is an exemplary diagram showing the configuration of a cleaning device for recovering iron from slag, which includes the present invention.

[0045] Below, with reference to the attached drawings, an embodiment of the present invention is described in detail so that a person having ordinary knowledge in the technical field to which the present invention pertains can easily practice the present invention.

[0046] FIG. 1 is an exemplary diagram showing a configuration according to a first embodiment of the present invention, and FIG. 2 is an exemplary cross-sectional diagram of a rotating drum according to the first embodiment of the present invention.

[0047] Referring to FIGS. 1 and 2, the iron recovery device from slag according to the first embodiment of the present invention includes a support frame (1), a rotating drum (2), a driving means (3), a raw material input unit (4), an acid solution treatment unit (5), and a control unit (6).

[0048] It is preferable that the above support frame (1) be formed longer than the length of the rotary drum (2) so as to support the rotary drum (2) formed in a cylindrical shape lying horizontally so as to be able to rotate.

[0049] In addition, it is desirable to have a skeletal structure in which multiple straight frames are welded to stably support the rotating drum (2), which is a heavy body.

[0050] The above rotary drum (2) is rotatably installed on a support frame (1) and is configured as a cylindrical shape lying horizontally, and has an input port (201) formed at the front end through which iron is input, an output port (202) formed at the end through which iron is output, and a spiral transfer screw (203) formed on the inner circumference to transfer iron input into the input port (201) to the output port (202).

[0051] The size or shape of the above-mentioned inlet (201) is not limited, and it is preferable that the raw material input portion (4) is directly connected to the inlet (201) so that low-purity iron recovered from the ironmaking slag supplied through the raw material input portion (4) is directly supplied into the rotating drum (2).

[0052] The size or shape of the above discharge port (202) is not limited, and the iron discharged from the discharge port (202) can be directly connected to a conveyor or the like for transport to the next process, such as drying, dehydration, or neutralization.

[0053] The above-mentioned transfer screw (203) is formed in a spiral shape on the inner surface of the rotary drum (2), with one end formed adjacent to the inlet (201) and the other end formed adjacent to the outlet (202), so that when iron is fed into the rotary drum (2) through the inlet (201) and the rotary drum (2) rotates around its axis, the iron inside the rotary drum (2) is transferred upward along the inner wall of the rotary drum (2) by the transfer screw (203), and then naturally falls due to its own weight, repeating the process of being transferred from the inlet (201) of the rotary drum (2) toward the outlet (202).

[0054] Meanwhile, the iron conveyed by the conveying screw (203) is conveyed upward along the inner wall of the rotating drum (2) and then naturally falls due to its own weight, and while repeating this process, it is dispersed without clumping or lumping, and the dispersed iron is stirred with the pickling solution filled to a certain level inside the rotating drum (2) and pickled, so that the outer surface of all the iron evenly comes into contact with the pickling solution, thereby improving the pickling efficiency.

[0055] The above driving means (3) is formed on one side of the support frame (1) to rotate the rotary drum (2), and includes a driving motor (301), a chain sprocket (302), a roller chain (303), and a guide roller (304).

[0056] The above driving motor (301) generates driving force for rotation of the rotary drum (2).

[0057] The above chain sprocket (302) is formed on the outer surface of the rotating drum (2).

[0058] The above roller chain (303) connects a drive sprocket installed on a drive shaft of a drive motor (301) and a chain sprocket (302) formed on the outer surface of a rotary drum (2), thereby transmitting the driving force generated from the drive motor (301) to the chain sprocket (302) to rotate the rotary drum (2).

[0059] The above guide rollers (304) are installed in a plurality of pieces to rotate on the support frame (1) and guide the rotating drum (2) while supporting it so that a stable rotation state can be maintained when the rotating drum (2) rotates by contacting the outer surface of the rotating drum (2).

[0060] The above raw material input section (4) is formed on one side of the rotating drum (2), and continuously inputs low-purity iron recovered from ironmaking slag into the rotating drum (2), and includes a supply conveyor (401) and a supply hopper (402).

[0061] The above supply conveyor (401) supplies low-purity iron recovered from ironmaking slag.

[0062] The above supply hopper (402) is equipped with an opening / closing shutter (402a) that is connected to the supply conveyor (401) and supplies iron supplied through the supply conveyor (401) to the inside of the rotating drum (2).

[0063] That is, the supply hopper (402) can control the supply of iron into the rotary drum (2) by opening and closing the opening shutter (402a), and the opening shutter (402a) is linked to the supply conveyor (401), so that when the opening shutter (402a) opens, the supply conveyor (401) operates, and when the opening shutter (402a) closes, the operation of the supply conveyor (401) also stops.

[0064] The above acid treatment unit (5) is formed on the other side of the rotary drum (2) and injects acid into the rotary drum (2) so that it reacts with the iron introduced into the rotary drum (2), and includes a filter unit (51), a spent acid storage unit (52), a hydrochloric acid storage unit (53), a water storage unit (54), an acid concentration control unit (55), and an acid storage unit (56).

[0065] The above filter unit (51) filters the waste acid solution discharged from the rotating drum (2).

[0066] That is, after pickling is performed in the rotating drum (2), the surface of the iron discharged is covered with pickling liquid and flows down. At this time, the flowing pickling liquid contains various foreign substances or impurities generated during the pickling process, so the flowing pickling liquid is collected and filtered using a filter member.

[0067] Meanwhile, it goes without saying that the material or type of the above filter member is not limited.

[0068] The above-mentioned spent acid storage unit (52) stores spent acid from which foreign substances have been filtered in the filter unit (51), and includes a spent acid storage tank (521), a spent acid concentration measuring means (522), a spent acid discharge valve (523), and a spent acid discharge amount measuring means (524).

[0069] The above-mentioned waste acid storage tank (521) stores waste acid from which foreign substances have been filtered in the filter unit (51).

[0070] It is preferable to use a dedicated storage container coated with rubber or synthetic resin for the waste acid detergent storage tank (521), and it is to be noted in advance that the capacity of the waste acid detergent storage tank (521) is not limited.

[0071] The above-mentioned waste acid solution concentration measuring means (522) measures the concentration of the waste acid solution stored in the waste acid solution storage tank (521) and provides the measured value to the control unit (6).

[0072] It is preferable that the acid solution concentration measuring means (522) measure the concentration of the acid solution by measuring electrical conductivity, but it is not limited thereto, and any means that can measure the concentration of the acid solution, i.e. the concentration of hydrochloric acid in the acid solution, may be used.

[0073] The above-mentioned spent acid tax discharge valve (523) is installed outside the spent acid tax storage tank (521) and controls the discharge of spent acid tax stored in the spent acid tax storage tank (521).

[0074] It is preferable that the waste acid tax discharge valve (523) be an electronic valve to enable remote control by the control unit (6), but it is not limited thereto.

[0075] The above-mentioned waste acid tax discharge amount measuring means (524) measures the amount of waste acid tax discharged through the waste acid tax discharge valve (523) and provides the measured value to the control unit (6).

[0076] Accordingly, when the spent acid washing liquid discharge valve (523) remotely controlled by the control unit (6) is opened, the spent acid washing liquid stored in the spent acid washing liquid storage tank (521) is discharged and supplied to the acid washing liquid concentration control unit (55), and the amount of the spent acid washing liquid discharged is measured by the spent acid washing liquid discharge amount measuring means (524) and provided to the control unit (6), so that a certain amount of the spent acid washing liquid set by the control unit (6) can be accurately supplied to the acid washing liquid concentration control unit (55), so that the concentration of the acid washing liquid mixed with the spent acid washing liquid, hydrochloric acid, and water in the acid washing liquid concentration control unit (55) can be quickly and accurately controlled.

[0077] The above hydrochloric acid storage unit (53) stores high-concentration hydrochloric acid, which is a raw material for the acid solution, and includes a hydrochloric acid storage tank (531), a hydrochloric acid discharge valve (532), and a hydrochloric acid discharge amount measuring means (533).

[0078] High concentration hydrochloric acid is stored in the above hydrochloric acid storage tank (531).

[0079] High-concentration hydrochloric acid refers to hydrochloric acid distributed and used for industrial purposes. Therefore, it is preferable to use a dedicated storage container coated with rubber or synthetic resin for the hydrochloric acid storage tank (531) to store high-concentration hydrochloric acid distributed and used for industrial purposes. It is to be noted in advance that the capacity of the hydrochloric acid storage tank (531) is not limited.

[0080] The above hydrochloric acid discharge valve (532) is installed outside the hydrochloric acid storage tank (531) and controls the discharge of high-concentration hydrochloric acid stored in the hydrochloric acid storage tank (531).

[0081] It is preferable that the hydrochloric acid discharge valve (532) be an electronic valve to enable remote control by the control unit (6), but it is not limited thereto.

[0082] The above hydrochloric acid discharge amount measuring means (533) measures the amount of high-concentration hydrochloric acid discharged through the hydrochloric acid discharge valve (532) and provides the measured value to the control unit (6).

[0083] Accordingly, when the hydrochloric acid discharge valve (532) remotely controlled by the control unit (6) is opened, the high-concentration hydrochloric acid stored in the hydrochloric acid storage tank (531) is discharged and supplied to the acid solution concentration control unit (55), and the discharge amount of the high-concentration hydrochloric acid is measured by the hydrochloric acid discharge amount measuring means (533) and provided to the control unit (6), so that a certain amount of high-concentration hydrochloric acid set by the control unit (6) can be accurately supplied to the acid solution concentration control unit (55), so that the concentration of the acid solution mixed with the spent acid solution and hydrochloric acid and water in the acid solution concentration control unit (55) can be quickly and accurately controlled.

[0084] The above water storage unit (54) stores water used for producing acid solution, and includes a water storage tank (541), a water discharge valve (542), and a water discharge amount measuring means (543).

[0085] The above water storage tank (541) stores water supplied through the water supply unit.

[0086] It is preferable to use general industrial water as the water used at this time, and it is to be noted in advance that the capacity of the water storage tank (541) is not limited.

[0087] The above water discharge valve (542) is installed outside the water storage tank (541) and controls the discharge of water stored in the water storage tank (541).

[0088] It is preferable that the water discharge valve (542) be an electronic valve to enable remote control by the control unit (6), but it is not limited thereto.

[0089] The above water discharge amount measuring means (543) measures the amount of water discharged through the water discharge valve (542) and provides the measured value to the control unit (6).

[0090] Accordingly, when the water discharge valve (542) remotely controlled by the control unit (6) is opened, the water stored in the water storage tank (541) is discharged and supplied to the acid concentration control unit (55), and the amount of water discharged is measured by the water discharge amount measuring means (543) and provided to the control unit (6), so that a certain amount of water set by the control unit (6) can be accurately supplied to the acid concentration control unit (55), so that the concentration of the acid solution mixed with the spent acid solution, hydrochloric acid, and water in the acid concentration control unit (55) can be quickly and accurately controlled.

[0091] The above acid concentration control unit (55) mixes the spent acid, hydrochloric acid, and water discharged from the spent acid storage unit (52), the hydrochloric acid storage unit (53), and the water storage unit (54), and includes an acid concentration control tank (551), an acid concentration measuring means, an acid discharge valve (553), and an acid discharge amount measuring means (554).

[0092] The above acid concentration control tank (551) mixes the acid waste, hydrochloric acid, and water discharged from the acid waste storage unit (52), the hydrochloric acid storage unit (53), and the water storage unit (54).

[0093] It is preferable to use a dedicated storage container coated with rubber or synthetic resin for the acid concentration control tank (551), and it is to be noted in advance that the capacity of the acid concentration storage tank is not limited.

[0094] In addition, the acid solution concentration control tank (551) may further be equipped with a stirring means for rapid and smooth mixing of the spent acid solution, hydrochloric acid, and water flowing into it.

[0095] The above acid solution concentration measuring means measures the concentration of the acid solution whose concentration has been adjusted in the acid solution concentration adjustment tank (551) and provides the measured value to the control unit (6).

[0096] That is, when the spent acid, hydrochloric acid, and water discharged from the spent acid storage unit (52), the hydrochloric acid storage unit (53), and the water storage unit (54) are mixed inside the acid concentration control tank (551), the concentration of the mixed acid changes. At this time, the concentration of the acid is measured, and the measured value is provided to the control unit (6).

[0097] It is preferable that the means for measuring the concentration of the pickling solution measure the concentration of the pickling solution by measuring the electrical conductivity, but it is not limited to this, and any means that can measure the concentration of the mixed pickling solution, i.e. the concentration of hydrochloric acid in the pickling solution, is possible.

[0098] The above acid solution discharge valve (553) is installed outside the acid solution concentration control tank (551) and controls the discharge of the acid solution whose concentration has been controlled within the acid solution concentration control tank (551).

[0099] It is preferable that the acid discharge valve (553) be an electronic valve to enable remote control by the control unit (6), but it is not limited thereto.

[0100] The above acid solution discharge amount measuring means (554) measures the discharge amount of acid solution with controlled concentration discharged through the acid solution discharge valve (553) and provides the measured value to the control unit (6).

[0101] Accordingly, when the acid solution discharge valve (553) remotely controlled by the control unit (6) is opened, the acid solution stored in the acid solution concentration control tank (551) is discharged and supplied to the acid solution storage unit (56). At this time, the amount of acid solution discharged is measured by the acid solution discharge amount measuring means (554) and provided to the control unit (6), so that the acid solution with a concentration adjusted to a certain amount set by the control unit (6) is stored in the acid solution storage unit (56).

[0102] The above acid storage unit (56) stores the acid solution discharged from the acid solution concentration control unit (55), and includes an acid solution storage tank (561), an acid solution supply valve (562), an acid solution supply amount measuring means (563), and an acid solution supply pump (564).

[0103] The acid solution storage tank (561) above stores the acid solution discharged from the acid solution concentration control unit (55).

[0104] In the pickling solution storage tank (561), the pickling solution is stored as a hydrochloric acid mixture of 5 to 20 wt%, the concentration of which is controlled by the pickling solution concentration control unit (55). Therefore, it is preferable to use a dedicated storage container coated with rubber or synthetic resin. It should be noted in advance that the capacity of the pickling solution storage tank (561) is not limited.

[0105] The above acid solution supply valve (562) is installed outside the acid solution storage tank (561) and controls the acid solution stored in the acid solution storage tank (561) to be supplied to the rotating drum (2).

[0106] It is preferable that the acid solution supply valve (562) be an electronic valve to enable remote control by the control unit (6), but it is not limited thereto.

[0107] The above acid solution supply amount measuring means (563) measures the supply amount of acid solution supplied through the acid solution supply valve (562) and provides the measured value to the control unit (6).

[0108] The above acid solution supply pump (564) supplies the acid solution stored in the acid solution storage tank (561) to the inside of the rotating drum (2), and its operation is controlled by the control unit (6).

[0109] Accordingly, when the acid solution supply valve (562) remotely controlled by the control unit (6) is opened and the acid solution supply pump (564) operates, the acid solution stored in the acid solution storage tank (561) is supplied to the rotary drum (2), and the amount of acid solution supplied at this time is measured by the acid solution supply amount measuring means (563) and provided to the control unit (6), so that a certain amount of acid solution set by the control unit (6) can be supplied to the rotary drum (2).

[0110] In one embodiment, the acid storage unit (56) may further include an acid heating means (565).

[0111] The above pickling solution heating means (565) heats the pickling solution that has passed through the pickling solution supply valve (562) to a temperature set in the control unit (6) before being supplied to the rotary drum (2), thereby enabling the pickling solution supplied into the rotary drum (2) to be supplied at a temperature that can exhibit optimal efficiency in pickling iron according to changes in season and temperature.

[0112] The above control unit (6) controls the operation of the drive motor (301) of the drive means (3), the conveyor and discharge shutter of the raw material input unit (4), and all valves and pumps of the acid treatment unit (5).

[0113] It is preferable that the control unit (6) be connected to enable data exchange via a wired or wireless communication network for remote control of the driving means (3), raw material input unit (4) and acid treatment unit (5).

[0114] In addition, it is preferable to have a memory unit for storing data such as reference values ​​for controlling the operation of the driving means (3), raw material input unit (4), and acid treatment unit (5).

[0115] In addition, a notification unit may be further provided to reduce the risk of a safety accident by generating an alarm signal when an error that goes beyond the scope of normal operation control occurs during the process of controlling the operation of the driving means (3), raw material input unit (4) and acid treatment unit (5).

[0116] It is desirable for the above notification unit to use speakers or lamps for audio-visual alerts, but it is not limited to these.

[0117]

[0118] Figure 3 is a cross-sectional view illustrating a manufacturing process according to a second embodiment of the present invention.

[0119] Referring to FIG. 3, a detailed description of the configuration overlapping with the above-described embodiment and the configuration having the same symbol is omitted.

[0120] The acid treatment unit (5) of the present invention according to the second embodiment may further include an acid treatment tank (57).

[0121] It is preferable that the above-mentioned acid washing tank (57) be formed larger than the rotary drum (2) so that the acid washing solution for acid washing is contained inside and the rotary drum (2) rotates while being partially submerged in the contained acid washing solution.

[0122] It is preferable that the inside of the acid washing tank (57) be formed by coating with rubber or synthetic resin, and it is to be noted in advance that the capacity of the acid washing tank (561) is not limited.

[0123] In addition, the pickling tank (57) is connected to the filtering unit (51) and the pickling solution storage unit (56) so that the pickling solution in the pickling tank (57) can be discharged to the filtering unit (51), or the pickling solution stored in the pickling solution storage tank (561) can be supplied into the pickling tank (57).

[0124] The iron recovery device from slag of the present invention configured as described above has the effect of greatly improving the continuity, efficiency and productivity of the iron pickling operation for producing high-purity iron by continuously feeding low-purity iron recovered from ironmaking slag into a rotating drum (2), pickling it using the pickling solution supplied into the rotating drum (2) and then automatically discharging it.

[0125] In addition, by filtering the waste acid solution discharged after acid washing and automatically adjusting the concentration so that it can be reused, the amount of hydrochloric acid used and the amount of waste hydrochloric acid generated are reduced, which significantly improves economic efficiency by reducing the costs of purchasing hydrochloric acid and disposing of waste hydrochloric acid.

[0126] In addition, by maintaining the concentration of the pickling solution constant during the continuous pickling process, there is also an effect of stably maintaining the pickling efficiency and the purity and quality of the pickled iron.

[0127]

[0128] Figure 4 is an exemplary diagram showing the configuration of a washing device for recovering iron from slag, which includes an iron recovery device from slag of the present invention.

[0129] Referring to FIG. 4, a detailed description of the configuration overlapping with the above-described embodiment and the configuration having the same symbol is omitted.

[0130] According to the present invention, iron discharged after acid washing is processed through a washing device consisting of a first dehydration unit (600), a neutralization unit (700), a second dehydration unit (800), and a drying unit (900) and recovered as high-purity iron.

[0131] That is, the iron discharged after pickling according to the present invention is supplied to the first dehydration unit (600) and is first dehydrated and discharged to remove the pickling solution that has accumulated during the pickling process, then supplied to the neutralization unit (700) and is neutralized with a neutralizing solution such as sodium hydroxide (NaOH) to prevent oxidation by the pickling solution remaining in the raw material dehydrated in the first dehydration unit (600), then supplied to the second dehydration unit (500) and is secondarily dehydrated and discharged to remove the neutralizing solution that has accumulated during the neutralization process, and is completely dried in the drying unit (900) by hot air at 110 to 200°C, whereby low-purity iron recovered from ironmaking slag is recovered as high-quality iron that can be used as a raw material for high-quality steel products.

[0132] In one embodiment, the first dehydration unit (600) may include a dehydration frame; a dehydration cover installed on the dehydration frame; a dehydration body rotatably installed inside the dehydration cover; a second motor for generating driving force; a gear installed on the outer surface of the dehydration body and connected to the second motor, and rotated by the driving force generated by the second motor; a second ring installed on the outer surface of the dehydration body but spaced apart from the gear; a second roller rotatably installed on the inner lower portion of the dehydration cover to assist the rotation of the dehydration body while in contact with the second ring; a washing liquid discharge port formed on the lower portion of the dehydration cover for discharging the washing liquid dehydrated by the rotation of the dehydration body; and an air nozzle formed on one side of the dehydration body for spraying air into the interior of the dehydration body.

[0133] In one embodiment, the neutralization unit (700) may include a neutralization frame; a neutralization cover installed on the neutralization frame; a neutralization body rotatably installed inside the neutralization cover; a third motor for generating driving force; a second sprocket installed on an outer surface of the neutralization body; a second chain for connecting the third motor and the second sprocket and transmitting the driving force generated by the third motor to the second sprocket; a third ring installed on an outer surface of the neutralization body but spaced apart from the second sprocket; a third roller rotatably installed on the inner lower portion of the neutralization cover to assist rotation of the neutralization body while in contact with the third ring; a neutralization solution spray nozzle formed on one side of the neutralization body for spraying a neutralization solution; a neutralization solution discharge port formed on a lower portion of the neutralization cover for discharging a neutralization solution; and a first gas vent formed on an upper portion of the neutralization cover for discharging a gas generated during neutralization.

[0134] In one embodiment, the drying unit (900) comprises: a drying frame; a drying body rotatably installed on the drying frame; a second transfer means formed on one side of the drying body for transferring raw materials transferred from a transfer means into the interior of the drying body; a second screw formed on the interior of the drying body for transferring raw materials transferred by the second transfer means to the other side of the drying body; a fifth motor for generating driving force; a third sprocket installed on the outer surface of the drying body; a third chain for connecting the fifth motor and the third sprocket and transferring the driving force generated by the fifth motor to the third sprocket; a fourth ring installed on the outer surface of the drying body but spaced apart from the third sprocket; a fourth roller rotatably installed on the drying frame for assisting the rotation of the drying body while in contact with the fourth ring; a second gas vent formed on the upper portion of the drying body for discharging gas generated during drying; And may include a heater formed on one side of the drying body, spaced apart from the second transmission means, for heating the interior of the drying body;

[0135] Although the present invention has been described above with respect to limited embodiments, the scope of the present invention is not limited thereto, and various modifications and improvements made by a person having ordinary skill in the art to which the present invention pertains within the scope equivalent to the technical idea of ​​the present invention and the claims below also fall within the scope of the present invention.

Claims

1. Support frame (1); A rotating drum (2) installed to rotate on the above support frame (1); A driving means (3) formed on one side of the above support frame (1) and rotating the rotary drum (2); A raw material input section (4) formed on one side of the above-mentioned rotating drum (2) and continuously inputting low-purity iron recovered from ironmaking slag into the rotating drum (2); An acid treatment unit (5) formed on the other side of the above-mentioned rotary drum (2) and injecting acid into the rotary drum (2) to react with the iron introduced into the rotary drum (2); It is composed of a control unit (6) that controls the operation of the driving means (3), raw material input unit (4) and acid treatment unit (5); The above acid treatment unit (5) is A filter unit (51) that filters the waste acid solution discharged from the above rotary drum (2); A waste acid storage unit (52) in which waste acid solution filtered of foreign substances in the above filter unit (51) is stored; Hydrochloric acid storage unit (53) where high-concentration hydrochloric acid, which is the raw material for the acid solution, is stored; A water storage unit (54) where water used for manufacturing acid solution is stored; An acid solution concentration control unit (55) in which the acid solution discharged from the above-mentioned waste acid solution storage unit (52), hydrochloric acid storage unit (53) and water storage unit (54) and the hydrochloric acid and water are mixed; and It includes an acid solution storage unit (56) in which the acid solution discharged from the acid solution concentration control unit (55) is stored; The above acid concentration control unit (55) is An acid solution concentration control tank (551) in which the acid solution discharged from the above-mentioned waste acid solution storage unit (52), hydrochloric acid storage unit (53) and water storage unit (54) and the hydrochloric acid and water are mixed; An acid solution concentration measuring means that measures the concentration of the acid solution whose concentration has been adjusted in the acid solution concentration adjusting tank (551) and provides the measured value to the control unit (6); An acid solution discharge valve (553) that controls the discharge of the acid solution whose concentration is adjusted in the acid solution concentration adjustment tank (551); and An iron recovery device from slag, characterized by including an acid solution discharge amount measuring means (554) for measuring the discharge amount of acid solution with a controlled concentration discharged through the acid solution discharge valve (553) and providing the measured value to a control unit (6); 2. In paragraph 1, The above waste acid tax storage unit (52) is, A waste acid tax storage tank (521) where waste acid tax is stored; A waste acid solution concentration measuring means (522) that measures the concentration of the waste acid solution stored in the waste acid solution storage tank (521) and provides the measured value to the control unit (6); A spent acid tax discharge valve (523) that controls the discharge of the spent acid tax stored in the spent acid tax storage tank (521); and An iron recovery device from slag, characterized by including a waste acid solution discharge amount measuring means (524) that measures the amount of waste acid solution discharged through the waste acid solution discharge valve (523) and provides the measured value to a control unit (6).

3. In paragraph 1, The above hydrochloric acid storage unit (53) is Hydrochloric acid storage tank (531) where high concentration hydrochloric acid is stored; A hydrochloric acid discharge valve (532) that controls the discharge of high-concentration hydrochloric acid stored in the hydrochloric acid storage tank (531); and An iron recovery device from slag, characterized by including a hydrochloric acid discharge amount measuring means (533) that measures the amount of high-concentration hydrochloric acid discharged through the hydrochloric acid discharge valve (532) and provides the measured value to a control unit (6).

Images