Slurry thickening system, sintered ore raw material particle manufacturing system, sintered ore manufacturing system, slurry thickening method, sintered ore raw material particle manufacturing method, and sintered ore manufacturing method

Abstract

To provide: a slurry concentrating system capable of stably adjusting a concentration after concentrating in concentrating a slurry; a production system of a sintered ore raw material grain; a production system of the sintered ore; a concentrating method of the slurry; a production method of the sintered ore raw material grain; and a production method of the sintered ore.SOLUTION: According to an embodiment of the invention, a slurry concentrating system is provided. The slurry concentrating system includes: a measurement unit measuring solid-substance concentration of a pre-concentration slurry; a concentration unit obtaining, from the pre-concentration slurry, a concentrated slurry in which the solid-substance concentration is increased; and a determination unit determining, on the basis of the solid-substance concentration of the pre-concentration slurry measured by the measurement unit, the amount of a dilution liquid to be added to the concentrated slurry or determining concentration conditions in the concentration unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a slurry thickening system, a sintered ore raw material particle manufacturing system, a sintered ore manufacturing system, a slurry thickening method, a sintered ore raw material particle manufacturing method, and a sintered ore manufacturing method. [Background technology]

[0002] Sintered ore is obtained by mixing iron ore powder with various additives, granulating the raw material particles, and sintering the mixture (see, for example, Patent Document 1). At this time, it is known that the granulation property of the raw material particles can be improved by adding fine powder containing an iron compound to the iron ore powder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-66766 A Summary of the Invention [Problem to be solved by the invention]

[0004] The more the fine powder is added, the more effective it is in improving granulation properties. However, if it is added in a dehydrated state, the fine powder dispersibility during granulation is poor, making it difficult to granulate uniformly. Therefore, the inventors of the present invention have investigated adding the fine powder to the iron ore powder as a slurry. As a result, they found that if a slurry containing a low concentration of fine powder is used, a large amount of water is added, which deteriorates granulation and increases the amount of coagulant used in sintering, so the slurry needs to be added in a state where the fine powder is concentrated and has a low water content.

[0005] In order to thicken the fine powder in the slurry, possible methods include storing the slurry in a tank and leaving it to stand to allow the fine powder to settle naturally, passing the slurry through a centrifugal separator (such as a thickener), or centrifuging the slurry using a decanter.

[0006] As a slurry for granulation, a steelmaking slurry from a steelworks is considered to be appropriate, but since the concentration of fine powder in the steel slurry varies, the concentration of fine powder in the thickened slurry obtained by the above-mentioned thickening method also varies. On the other hand, since the effect of improving granulation properties varies depending on the amount of fine powder added during granulation, if the concentration of fine powder in the thickened slurry is added without adjusting it, the effect of improving granulation properties cannot be stably exhibited.

[0007] In view of the above circumstances, the present invention provides a slurry thickening system, a sintered ore raw material particle manufacturing system, a sintered ore manufacturing system, a slurry thickening method, a sintered ore raw material particle manufacturing method, and a sintered ore manufacturing method, which can stably adjust the concentration after thickening when thickening a slurry. [Means for solving the problem]

[0008] According to one aspect of the present invention, there is provided a slurry thickening system, comprising: a measuring unit for measuring a concentration of solid matter in a slurry before thickening, a thickening unit for obtaining a thickened slurry having an increased concentration of solid matter from the slurry before thickening, and a determining unit for determining an amount of diluent to be added to the thickened slurry based on the concentration of the solid matter in the slurry before thickening measured in the measuring unit, or for determining thickening conditions in the thickening unit.

[0009] The present invention may be provided in the following aspects.

[0010] (1) A slurry thickening system comprising: a measuring unit that measures a concentration of solid matter in a slurry before thickening; a thickening unit that obtains a thickened slurry having an increased concentration of solid matter from the slurry before thickening; and a determination unit that determines an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the slurry before thickening measured in the measuring unit, or determines thickening conditions in the thickening unit.

[0011] (2) In the slurry thickening system described in (1) above, the determination unit further determines the amount of diluent to be added to the thickened slurry based on a relationship model showing the relationship between the concentration of solid matter in the pre-thickened slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry.

[0012] (3) The slurry thickening system according to (1) or (2) above, wherein the thickening section is a centrifuge.

[0013] (4) The slurry thickening system according to any one of the above (1) to (3), wherein the measurement unit is a radial gamma ray densitometer and / or an ultrasonic densitometer.

[0014] (5) The slurry thickening system according to any one of the above (1) to (4), wherein the pre-thickening slurry contains iron compounds generated as solid substances in a steelworks.

[0015] (6) The slurry thickening system according to any one of the above (1) to (4), wherein the pre-thickening slurry contains a steelmaking slurry from a steelworks.

[0016] (7) The slurry thickening system according to (5) or (6) above, further comprising a dilution unit that adds the amount of the dilution liquid determined in the determination unit to the thickened slurry to obtain a diluted slurry.

[0017] (8) The slurry thickening system according to (7) above, wherein the diluted slurry is for use in improving granulation in iron ore granulation in a steelworks.

[0018] (9) A method for thickening a slurry, comprising: a measuring step for measuring a concentration of solid matter in a slurry before thickening; a thickening step for obtaining a thickened slurry having an increased concentration of solid matter from the slurry before thickening; and a determining step for determining an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the slurry before thickening measured in the measuring step, or for determining thickening conditions in the thickening step.

[0019] (10) A system for producing sintered ore raw material particles, comprising: a measuring unit for measuring a concentration of solid matter in a pre-thickening slurry; a thickening unit for obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; a determining unit for determining an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickening slurry measured in the measuring unit, or for determining thickening conditions in the thickening unit; a diluting unit for adding the diluent to the thickened slurry to obtain a diluted slurry; and a granulating unit for adding the diluted slurry to iron ore powder to granulate pre-sintered particles.

[0020] (11) A method for producing sinter raw material particles, comprising: a measuring step for measuring a concentration of solid substances in a pre-thickening slurry; a thickening step for obtaining a thickened slurry having an increased concentration of solid substances from the pre-thickening slurry; a determining step for determining an amount of diluent to be added to the thickened slurry based on the concentration of solid substances in the pre-thickening slurry measured in the measuring step, or for determining thickening conditions in the thickening step; a diluting step for adding the diluent to the thickened slurry to obtain a diluted slurry; and a granulating step for adding the diluted slurry to iron ore powder to granulate pre-sinter particles.

[0021] (12) A sintered ore manufacturing system comprising: a measuring unit that measures a concentration of solid substances in a pre-thickened slurry; a thickening unit that obtains a thickened slurry having an increased concentration of solid substances from the pre-thickened slurry; a determining unit that determines an amount of diluent to be added to the thickened slurry based on the concentration of solid substances in the pre-thickened slurry measured in the measuring unit or determines thickening conditions in the thickening unit; a diluting unit that adds the diluent to the thickened slurry to obtain a diluted slurry; a granulating unit that adds the diluted slurry to iron ore powder to granulate pre-sintered particles; and a sintering unit that sinters the pre-sintered particles.

[0022] (13) A method for producing sintered ore, comprising: a measuring step for measuring a concentration of solid substances in a pre-thickened slurry; a thickening step for obtaining a thickened slurry having an increased concentration of solid substances from the pre-thickened slurry; a determining step for determining an amount of diluent to be added to the thickened slurry based on the concentration of solid substances in the pre-thickened slurry measured in the measuring step, or for determining thickening conditions in the thickening step; a diluting step for adding the diluent to the thickened slurry to obtain a diluted slurry; a granulating step for adding the diluted slurry to iron ore powder to granulate pre-sintered particles; and a sintering step for sintering the pre-sintered particles. Of course, this is not the case. Effect of the Invention

[0023] According to the present invention, it is possible to provide a slurry thickening system capable of adjusting the concentration after thickening to a constant value, a sintered ore raw material particle manufacturing system, a sintered ore manufacturing system, a slurry thickening method, a sintered ore raw material particle manufacturing method, and a sintered ore manufacturing method. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic diagram of a slurry thickening system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram for explaining a specific configuration of the slurry thickening system according to the present embodiment. [Diagram 3] FIG. 11 is a diagram for explaining another specific configuration of the slurry thickening system according to the present embodiment. [Figure 4] FIG. 1 is a schematic diagram of a slurry thickening test system used in the examples. [Diagram 5] 1 is a plot of the reading of the suspended solids concentration meter 2C versus the solids concentration of the slurry before thickening. [Figure 6] 1 is a plot of the solids concentration of the thickened slurry versus the solids concentration of the slurry before thickening. [Figure 7] 1 is a plot of the amount of solids in a thickened slurry versus the concentration of solids in a pre-thickened slurry. [Figure 8] 1 is a plot of the amount of diluent required versus the concentration of solids in the pre-thickened slurry. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The following describes the slurry thickening system, the sintered ore raw material particle manufacturing system, the sintered ore manufacturing system, the slurry thickening method, the sintered ore raw material particle manufacturing method, and the sintered ore manufacturing method using specific examples, but the present invention is not limited to the following embodiments, and can be implemented by making appropriate changes within the scope that does not impair the effects of the present invention. In addition, each configuration described in the following embodiments can be implemented in combination with each other.

[0026] In the present invention, "thickening" refers to increasing the concentration of solid substances in a slurry. The specific means for "thickening" is not particularly limited.

[0027] <Slurry thickening system> The slurry thickening system of this embodiment includes a measurement unit that measures the concentration of solid matter in the slurry before thickening, a thickening unit that obtains a thickened slurry having an increased concentration of solid matter from the slurry before thickening, and a determination unit that determines the amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the slurry before thickening measured in the measurement unit, or determines the thickening conditions in the thickening unit.

[0028] Fig. 1 is a schematic diagram of a slurry thickening system according to this embodiment. The slurry thickening system 1 shown in Fig. 1 includes a measurement unit 2, a thickening unit 3, and a determination unit 4. Although not an essential component, the slurry thickening system 1 includes a dilution unit 5 that adds the amount of diluent determined in the determination unit 4 to the thickened slurry to obtain a diluted slurry. Hereinafter, the slurry thickening system according to this embodiment will be described with reference to Fig. 1.

[0029] [Measurement part] The measuring section 2 measures the concentration of solid matter in the slurry before thickening.

[0030] The measuring unit 2 is not particularly limited as long as it is a suspended solids concentration meter capable of measuring the concentration of suspended solids (SS) in the slurry, and for example, a radiation type gamma ray concentration meter, an ultrasonic concentration meter, a Coriolis type concentration meter, a laser type concentration meter, a turbidity meter, etc. can be used. Note that, since calcium carbonate and the like are likely to precipitate and adhere in the slurry, it is preferable to use a radiation type gamma ray density meter and / or an ultrasonic concentration meter as the measuring unit 2, since they can be attached to the outside of the slurry piping without contacting the slurry itself, and can measure the suspended solids concentration from a few % to a high concentration of about 40%.

[0031] (Slurry before thickening) The pre-thickening slurry is a slurry that is a target for increasing the concentration of solid matter using the slurry thickening system according to this embodiment.

[0032] In one embodiment, the pre-thickening slurry may contain iron compounds generated in a steelworks as solid substances. Specifically, the pre-thickening slurry is not particularly limited, and may be, for example, a pig iron making slurry generated in a pig iron making process in a steelworks, a steel making slurry generated in a steel making process in a steelworks, or a rolling slurry generated in a rolling process in a steelworks. In particular, it is preferable to use a steel making slurry because the particle diameter of the solid substances (suspended substances) is small and the effect of improving the granulation property is large.

[0033] [Concentrated part] The thickening section 3 obtains a thickened slurry having an increased concentration of solid substances from the pre-thickening slurry.

[0034] The thickening section 3 is not particularly limited as long as it can increase the concentration of solid substances from the slurry before thickening, and for example, a tank (natural sedimentation), a thickener, a centrifugal separator (decanter, etc.), etc. can be used. Among them, it is preferable to use a centrifugal separator as the thickening section 3. Unlike thickening using a tank or thickener, thickening using a centrifugal separator can be processed in a short time and has a short residence time, so that the measurement result of the suspended solids concentration can be relatively easily used to control the dilution liquid without correction considering the passage of time or the inflow and outflow at that time. In addition, by adding a dilution liquid when the thickened slurry is discharged from the rotating cylinder in the decanter to the casing at high rotation, it is easy to uniformly dilute the slurry with the dilution liquid. In addition, the tank, thickener, centrifugal separator, etc. can be appropriately selected from devices that can thicken the thickened slurry to a concentration equal to or higher than the set concentration, taking into consideration the supply amount range and concentration range of the supplied slurry.

[0035] In the thickening section 3, a thickened slurry and a separated liquid are obtained, and from the viewpoint of stable operation of the solid material recovery and separated liquid drainage process, it is preferable that the solid substance concentration in the separated liquid is low. The solid substance concentration in the separated liquid can be controlled, for example, by the supply amount of the slurry before thickening or the thickening conditions in the thickening section, and for example, when a centrifuge is used, it can be controlled by adjusting the rotation speed, differential speed, dam height, etc. When a centrifuge is used, it is particularly preferable to perform separation at a centrifugal force of 1500 G or more.

[0036] [Decision section] The determination unit 4 determines the amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured in the measurement unit described above, or determines the thickening conditions in the thickening unit.

[0037] The determination unit 4 is not particularly limited as long as it can determine the amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry, or can perform calculations to determine the thickening conditions in the thickening unit, and various types of calculation devices can be used.

[0038] (Determining the amount of dilution water) In one embodiment, the determination unit 4 further determines the amount of diluent to be added to the thickened slurry based on a relationship model showing the relationship between the concentration of solid matter in the pre-thickened slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry.

[0039] When using a relationship model showing the relationship between the concentration of solid substances in the slurry before thickening and the concentration of solid substances in the thickened slurry, such a relationship model can be, for example, a function or lookup table showing the relationship between the concentration of solid substances in the slurry before thickening and the concentration of solid substances in the thickened slurry, or a learned model of the relationship between the concentration of solid substances in the slurry before thickening and the concentration of solid substances in the thickened slurry. By using such a relationship model, the concentration of solid substances in the thickened slurry can be specified simply by measuring the concentration of solid substances in the slurry before thickening. Then, from the concentration of solid substances in the thickened slurry estimated in this way, the amount of diluent to be added to the thickened slurry to obtain a certain slurry concentration can be calculated.

[0040] In addition, when using a relationship model showing the relationship between the concentration of solid substances in the slurry before thickening and the amount of diluent added to the thickened slurry, such a relationship model can be, for example, a function or lookup table showing the relationship between the concentration of solid substances in the slurry before thickening and the amount of diluent added to the thickened slurry, or a learned model of the relationship between the concentration of solid substances in the slurry before thickening and the amount of diluent added to the thickened slurry, etc. By using such a relationship model, the amount of diluent added to the thickened slurry to achieve a certain slurry concentration can be directly calculated by simply measuring the concentration of the solid substances in the slurry before thickening.

[0041] (Determination of enrichment conditions) In one embodiment, the determination unit 4 further determines the amount of diluent to be added to the thickened slurry based on a relationship model showing the relationship between the concentration of solid matter in the slurry before thickening and the thickening conditions in the thickening unit.

[0042] When using a relationship model showing the relationship between the concentration of the solid substance of the slurry before thickening and the concentration of the solid substance of the slurry before thickening and the thickening conditions in the thickening section, such a relationship model can be, for example, a function or lookup table showing the relationship between the concentration of the solid substance of the slurry before thickening and the concentration of the solid substance of the slurry before thickening and the thickening conditions in the thickening section, or a learned model of the relationship between the concentration of the solid substance of the slurry before thickening and the concentration of the solid substance of the slurry before thickening and the thickening conditions in the thickening section. By using such a relationship model, the concentration of the solid substance of the slurry before thickening can be measured and the thickening conditions for obtaining the desired solid substance of the slurry after thickening can be specified simply by setting the desired solid substance of the slurry after thickening.

[0043] Specifically, the thickening conditions can be the supply amount of the slurry before thickening, and when a centrifuge is used, the rotation speed, the differential speed, the dam height, etc. Only one thickening condition may be used, or two or more thickening conditions may be used.

[0044] These relationship models may be created in advance by operating the slurry thickening system 1, or may be created during operation of the slurry thickening system 1. Furthermore, during operation of the slurry thickening system 1, the currently used relationship model may be corrected or replaced using newly measured information.

[0045] [Dilution section] The dilution unit 5 adds the diluent in the amount determined in the determination unit 4 to the thickened slurry to obtain a diluted slurry.

[0046] (Dilution solution) The diluent is added to the slurry after it has been thickened to reduce the concentration of the solid materials contained therein.

[0047] Specifically, the diluent is not particularly limited as long as it can reduce the concentration of solid substances in the thickened slurry by adding it. For example, a slurry having a lower concentration of solid substances than the thickened slurry, including the slurry before thickening, may be used, or industrial water, tap water, pure water, wastewater that can be mixed without problems, etc. may be used. However, since the slurry before thickening contains solid substances, the adjustment of the amount to be added may be complicated, and clogging may occur depending on the pipe used for addition. In addition, depending on the type, wastewater may contain suspended matter, and the precipitation of hardness components may cause clogging depending on the pipe used for addition. Furthermore, tap water and pure water are expensive. For these reasons, it is preferable to use industrial water as the diluent.

[0048] The location where the diluent is added to the thickened slurry is not particularly limited, but for example, when a decanter is used as the thickening section 3, it is preferable to add the diluent to the thickened slurry discharged from the rotating cylinder inside the casing of the decanter from the standpoint of uniformly mixing it with the thickened slurry, but the diluent may be added after the slurry is discharged from the decanter and during its transfer to a tank for storing water (including falling from the decanter), or may be added into the tank for storing water.

[0049] The method for adjusting the amount of diluent added is not particularly limited, but may be, for example, by adjusting the opening of a valve or by controlling an inverter of a pump. When adding the diluent to the thickened slurry discharged from the rotating cylinder in the casing of the decanter, it is preferable to spray the diluent under high pressure using a nozzle or the like to promote uniform mixing with the thickened slurry. In this case, care must be taken to prevent clogging of the nozzle or the like.

[0050] The application of the diluted slurry thus obtained is not particularly limited, but it can be used, for example, to improve granulation in the granulation of iron ore in a steelworks.

[0051] [Example 1 of a slurry thickening system] FIG. 2 is a diagram for explaining a specific configuration of the slurry thickening system according to the present embodiment.

[0052] The slurry system 1A shown in Figure 2 includes a suspended solids concentration meter 2A, a decanter 3A, an arithmetic and control device 4A, a valve 5A, a pre-thickening slurry tank 6A, a dilution liquid tank 7A, a separation water tank 8A, a diluted slurry tank 9A, pumps 10A, 11A, 12A, 13A, and a suspended solids concentration meter 14A.

[0053] The unthickened slurry stored in the unthickened slurry tank 6A is transferred to the decanter 3A by the pump 10A. At this time, a suspended solids concentration meter 2A is provided in the piping connecting the unthickened slurry tank 6A and the decanter 3A, and this suspended solids concentration meter 2A measures the solid matter concentration of the slurry flowing inside the piping. Meanwhile, the unthickened slurry transferred to the decanter 3A has some of the water removed by the decanter and the solid matter is thickened, thereby obtaining a thickened slurry.

[0054] Information on the concentration of solid matter measured by the suspended solids concentration meter 2A is sent to the calculation and control device 4A that is connected in a state where it can communicate with the suspended solids concentration meter 2A. The calculation and control device 4A that receives this information determines the amount of diluent to be added to the thickened slurry based on the concentration of the solid matter. Specifically, the calculation and control device 4A holds in advance a relationship model that indicates the relationship between the concentration of solid matter in the slurry before thickening and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry, and determines the amount of diluent to be added to the thickened slurry directly or via the concentration of solid matter in the thickened slurry from the measured concentration of solid matter.

[0055] Here, diluent tank 7A, which stores diluent, is connected to decanter 3A by a pipe for transferring diluent, and diluent is transferred by pump 11A provided on this pipe. Valve 5A is provided midway along this pipe, and the amount of diluent transferred to decanter 3A is adjusted by opening and closing valve 5A. Valve 5A is connected in a state capable of communicating with arithmetic and control device 4A, and the opening and closing and the degree of opening and closing are controlled by this arithmetic and control device based on the amount of diluent determined by arithmetic and control device 4A.

[0056] In this way, the dilute liquid transferred to the decanter 3A is mixed with the thickened slurry that has been thickened in the decanter 3A, and is discharged from the decanter 3A as a diluted slurry, which is then stored in the diluted slurry tank 9A. After that, the diluted slurry has its solid matter concentration measured by the suspended solids concentration meter 14A, and is then transferred to the next process by the pump 13A.

[0057] On the other hand, the water separated and removed from the pre-thickening slurry in the decanter 3A is stored as separated water in a separated water tank 8A, and then transferred to the next process by a pump 12A.

[0058] The pre-thickening slurry tank 6A, dilution liquid tank 7A, separation water tank 8A and dilution slurry tank 9A may be provided with an agitator (not shown) as necessary. In particular, the pre-thickening slurry tank 6A and dilution slurry tank 9A are provided with an agitator to prevent settling or deposition of solid substances.

[0059] [Example 2 of a slurry thickening system] FIG. 3 is a diagram for explaining another specific configuration of the slurry thickening system according to the present embodiment.

[0060] The slurry system 1B shown in Figure 3 includes a suspended solids concentration meter 2B, a decanter 3B, a calculation and control device 4B, a valve 5B, a pre-dilution slurry tank 6B, a dilution liquid tank 7B, a separation water tank 8B, a diluted slurry tank 9B, pumps 10B, 11B, 12B, and 13B, and a suspended solids concentration meter 14B.

[0061] Here, the slurry system 1B differs from the slurry system 1A in that the diluent stored in the diluent tank 7A is transferred to the post-dilution slurry tank 9B, and dilution is performed in the post-dilution slurry tank 9B. The other configurations are the same as those of the slurry system 1A.

[0062] <Slurry thickening method> The method for thickening a slurry according to the present embodiment includes a measuring step for measuring the concentration of solid matter in the slurry before thickening, a thickening step for obtaining a thickened slurry having an increased concentration of solid matter from the slurry before thickening, and a determining step for determining the amount of diluent to be added to the thickened slurry based on the concentration of the solid matter in the slurry before thickening measured in the measuring step, or for determining thickening conditions in the thickening step.

[0063] Such a slurry thickening method can be carried out, for example, by using the above-mentioned slurry thickening system. The specific operation in the measurement step is the same as the operation of the measurement unit of the slurry thickening system, the specific operation in the thickening step is the same as the operation of the thickening unit of the slurry thickening system, and the specific operation in the determination step is the same as the operation of the determination unit of the slurry thickening system.

[0064] The method for thickening a slurry may further include a dilution step of adding the amount of diluent determined in the determination step to the thickened slurry to obtain a diluted slurry. The specific operation in the dilution step is the same as the operation in the dilution section of the slurry thickening system.

[0065] <Sintered ore raw material particle manufacturing system> The manufacturing system for sintered ore raw material particles according to this embodiment includes a measurement unit that measures the concentration of solid matter in the pre-thickening slurry, a thickening unit that obtains a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry, a determination unit that determines the amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickening slurry measured in the measurement unit or determines the thickening conditions in the thickening unit, a dilution unit that adds diluent to the thickened slurry to obtain a diluted slurry, and a granulation unit that adds the diluted slurry to iron ore powder to granulate pre-sintered particles.

[0066] The measurement section, thickening section, determination section and dilution section are similar to the measurement section, thickening section, determination section and dilution section in the slurry thickening system, respectively.

[0067] The granulation section is not particularly limited as long as it can add the diluted slurry to the iron ore powder and granulate the pre-sintered particles, and for example, a drum mixer can be used. Also, a device for adding the diluted slurry to the iron ore powder, kneading and mixing (Loedige mixer, etc.) can be used in combination with a device for granulation (disc pelletizer, pan pelletizer, etc.).

[0068] In the granulation section, when the diluted slurry is added to the iron ore powder, additives such as powdered auxiliary raw materials such as limestone, silica stone, and serpentine, powdered miscellaneous raw materials such as dust, scale, and return ore, and solid fuels such as coke powder may be further added.

[0069] <Method of manufacturing sintered ore raw material particles> The method for producing sintered ore raw material particles according to this embodiment includes a measurement step for measuring the concentration of solid matter in a pre-thickening slurry, a concentration step for obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry, a determination step for determining the amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickening slurry measured in the measurement step or for determining the concentration conditions in the concentration step, a dilution step for adding a diluent to the thickened slurry to obtain a diluted slurry, and a granulation step for adding the diluted slurry to iron ore powder to granulate pre-sintered particles.

[0070] Such a method for producing sintered ore raw material particles can be carried out, for example, by using the above-mentioned production system for sintered ore raw material particles. The specific operation in the measurement step is the same as the operation of the measurement section of the slurry thickening system, the specific operation in the thickening step is the same as the operation in the thickening section of the slurry thickening system, the specific operation in the determination step is the same as the operation in the determination section of the slurry thickening system, and the specific operation in the dilution step is the same as the operation in the dilution section of the slurry thickening system. In addition, the specific operation in the granulation step is the same as the operation in the granulation section of the production system for sintered ore raw material particles.

[0071] <Sintered ore manufacturing system> The sintered ore manufacturing system of this embodiment includes a measurement unit that measures the concentration of solid substances in a pre-thickening slurry, a thickening unit that obtains a thickened slurry having an increased concentration of solid substances from the pre-thickening slurry, a determination unit that determines the amount of diluent to be added to the thickened slurry based on the concentration of solid substances in the pre-thickening slurry measured in the measurement unit or determines the thickening conditions in the thickening unit, a dilution unit that adds diluent to the thickened slurry to obtain a diluted slurry, a granulation unit that adds the diluted slurry to iron ore powder to granulate pre-sintered particles, and a sintering unit that sinters the pre-sintered particles.

[0072] The measuring section, thickening section, determination section, and dilution section are the same as the measuring section, thickening section, determination section, and dilution section in the slurry thickening system, respectively. The granulating section is the same as the granulating section in the sintered ore raw material particle manufacturing system.

[0073] The sintering section is not particularly limited as long as it can sinter the pre-sintered particles, and for example, a sintering furnace can be used. Specifically, the sintering section stacks the pre-sintered particles on a moving pallet, ignites the upper surface of the stacked raw material, and oxidizes the coke and the like while sucking air from above to below the stacked raw material, and produces sintered ore by utilizing the heat generated during the oxidation.

[0074] <Manufacturing method of sintered ore> The method for producing sintered ore according to this embodiment includes a measuring step for measuring the concentration of solid substances in a pre-thickened slurry, a thickening step for obtaining a thickened slurry having an increased concentration of solid substances from the pre-thickened slurry, a determining step for determining the amount of diluent to be added to the thickened slurry based on the concentration of solid substances in the pre-thickened slurry measured in the measuring step or for determining thickening conditions in the thickening step, a diluting step for adding diluent to the thickened slurry to obtain a diluted slurry, a granulating step for adding the diluted slurry to iron ore powder to granulate pre-sintered particles, and a sintering step for sintering the pre-sintered particles.

[0075] Such a method for producing sintered ore raw material particles can be carried out, for example, by using the above-mentioned production system for sintered ore raw material particles. The specific operation in the measurement step is the same as the operation of the measurement section of the slurry thickening system, the specific operation in the thickening step is the same as the operation in the thickening section of the slurry thickening system, the specific operation in the determination step is the same as the operation in the determination section of the slurry thickening system, and the specific operation in the dilution step is the same as the operation in the dilution section of the slurry thickening system. In addition, the specific operation in the granulation step is the same as the operation in the granulation section of the production system for sintered ore raw material particles. Furthermore, the specific operation in the sintering step is the same as the operation in the sintering section of the production system for sintered ore. EXAMPLES

[0076] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples in any way.

[0077] <Example> [Experimental Equipment] A slurry thickening test system was constructed as shown in Fig. 4. Fig. 4 is a schematic diagram of the slurry thickening test system used in the examples. Specifically, the slurry thickening test system 1C shown in Fig. 4 includes a pre-thickening slurry tank 6C, a pump 10C, a suspended solids concentration meter 2C, and a decanter 3C.

[0078] In this slurry thickening test system 1C, the pre-thickened slurry is stored in a pre-thickened slurry tank 6C, and the pre-thickened slurry is transferred to a decanter 3C by a pump 10C. The pre-thickened slurry and the decanter 3C are connected by a pipe, and a suspended solids concentration meter 2C is disposed in the middle of the pipe. The decanter 3C thickens the pre-thickened slurry to obtain a thickened slurry.

[0079] The following components were used: (Pre-thickening slurry tank 6C) · 200L SUS tank Attached agitator KP-4003 (Pump 10C) Heishin Mono Pump NHL15 PUN manufactured by Heishin Equipment Co., Ltd. (Suspended solids concentration meter 2C) Nanogray Co., Ltd. Gamma ray concentration meter PH-1100A (Decanter 3C) Tomoe Engineering Co., Ltd. Decanter type centrifugal dehydrator PTM006 Centrifugal force: 1500G ·Differential speed 40Δmin -1 Dam Height #4 (Maximum Height) ·Supply amount 300L / h

[0080] 〔experiment〕 (Example) The solid matter concentration of the slurry before thickening was changed to 17 w / w%, 20 w / w%, 24 w / w%, 28 w / w% and 33 w / w%, and the solid matter concentration of the thickened slurry and the amount generated per minute were measured. In each case, the amount of diluent required to make the thickened slurry 40% thick was calculated.

[0081] [Results and Discussion] (Example) Table 1 shows the solid matter concentration of the slurry before thickening and the readings of the suspended solids concentration meter 2C in the examples. [Table 1]

[0082] FIG. 5 is a plot of the reading of the suspended solids concentration meter 2C versus the solids concentration of the pre-thickening slurry.

[0083] From Table 1 and Figure 5, it is demonstrated that the indicated value of the suspended solids concentration meter 2C and the concentration of solids in the slurry before thickening are in a proportional relationship, and that the concentration of solids in the slurry before thickening can be measured using the suspended solids concentration meter 2C.

[0084] Table 2 also shows the concentration of solid matter in the slurry before thickening, the concentration of solid matter in the slurry after thickening, the mass of solid matter in the slurry after thickening, and the amount of dilution liquid required.

[0085] [Table 2]

[0086] Figure 6 is a plot of the solids concentration of the thickened slurry versus the solids concentration of the unthickened slurry, Figure 7 is a plot of the amount of solids of the thickened slurry versus the solids concentration of the unthickened slurry, and Figure 8 is a plot of the amount of diluent required versus the solids concentration of the unthickened slurry.

[0087] From Table 1 and Figures 6 to 8, it is clear that there is a certain relationship between the concentration of solid matter in the slurry before thickening, the concentration and amount of solid matter in the slurry after thickening, and the amount of diluent required. [Explanation of symbols]

[0088] 1,1A,1B Slurry thickening system 1C Slurry thickening test system 2 Measuring part 2A,2B,2C,14A,14B Suspended solids concentration meter 3 Concentrated part 3A, 3B, 3C Decanter 4 Decision Section 4A, 4B Calculation and control device 5 Dilution section 5A,5B Valve 6A, 6B, 6C Pre-thickening slurry tank 7A, 7B Dilution tank 8A, 8B Separation tank 9A, 9B Dilution slurry tank 10A, 10B, 10C, 11A, 11B, 12A, 12B, 13A, 13B Pump

Claims

1. 1. A slurry thickening system comprising: A measuring unit for measuring the concentration of solid matter in the pre-thickening slurry; A thickening section for obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; A determination unit that determines an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured by the measurement unit, The determination unit determines the amount of diluent to be added to the thickened slurry based on a relationship model showing a relationship between the concentration of solid matter in the pre-thickening slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry. Slurry thickening system.

2. 2. The slurry thickening system of claim 1, A centrifugal separator is used as the thickening section. Slurry thickening system.

3. 2. The slurry thickening system of claim 1, A radiation type gamma ray densitometer and / or an ultrasonic densitometer are used as the measuring unit. Slurry thickening system.

4. 2. The slurry thickening system of claim 1, The pre-thickening slurry contains iron compounds generated in steel mills as solid materials. Slurry thickening system.

5. 2. The slurry thickening system of claim 1, The pre-thickening slurry includes a steelmaking slurry from a steel mill. Slurry thickening system.

6. 5. The slurry thickening system according to claim 4, The method further includes a dilution unit that adds the diluent in an amount determined in the determination unit to the thickened slurry to obtain a diluted slurry. Slurry thickening system.

7. 7. The slurry thickening system according to claim 6, The diluted slurry is for use in improving granulation in iron ore granulation in steel mills. Slurry thickening system.

8. 1. A method for thickening a slurry, comprising: A measuring step of measuring the concentration of solid matter in the pre-thickening slurry; A thickening step of obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; A determination step of determining an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured in the measurement step, In the determination step, the amount of diluent to be added to the thickened slurry is determined based on a relationship model showing the relationship between the concentration of solid matter in the pre-thickening slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry. Slurry thickening method.

9. A system for producing sintered ore raw material particles, comprising: A measuring unit for measuring the concentration of solid matter in the pre-thickening slurry; A thickening section for obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; A determination unit that determines an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured in the measurement unit; A dilution section for adding the diluent to the thickened slurry to obtain a diluted slurry; a granulation unit that adds the diluted slurry to iron ore powder to granulate pre-sintered particles, The determination unit determines the amount of diluent to be added to the thickened slurry based on a relationship model showing a relationship between the concentration of solid matter in the pre-thickening slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry. A system for producing sintered ore raw material particles.

10. A method for producing sintered ore raw material particles, comprising: A measuring step of measuring the concentration of solid matter in the pre-thickening slurry; A thickening step of obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; A determination step of determining an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured in the measurement step; a dilution step of adding the diluent to the thickened slurry to obtain a diluted slurry; A granulation step of adding the diluted slurry to iron ore powder to granulate pre-sintered particles, In the determination step, the amount of diluent to be added to the thickened slurry is determined based on a relationship model showing the relationship between the concentration of solid matter in the pre-thickening slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry. A method for producing sintered ore raw material particles.

11. A sintered ore manufacturing system, comprising: A measuring unit for measuring the concentration of solid matter in the pre-thickening slurry; A thickening section for obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; A determination unit that determines an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured in the measurement unit; A dilution section for adding the diluent to the thickened slurry to obtain a diluted slurry; a granulation section for adding the diluted slurry to iron ore powder to granulate pre-sintered particles; A sintering unit that sinters the pre-sintered particles, The determination unit determines the amount of diluent to be added to the thickened slurry based on a relationship model showing a relationship between the concentration of solid matter in the pre-thickening slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry. Sintered ore production system.

12. A method for producing sintered ore, comprising the steps of: A measuring step of measuring the concentration of solid matter in the pre-thickening slurry; A thickening step of obtaining a thickened slurry having an increased concentration of solid matter from the pre-thickening slurry; A determination step of determining an amount of diluent to be added to the thickened slurry based on the concentration of solid matter in the pre-thickened slurry measured in the measurement step; a dilution step of adding the diluent to the thickened slurry to obtain a diluted slurry; a granulation step of adding the diluted slurry to iron ore powder to granulate pre-sintered particles; A sintering step of sintering the pre-sintered particles, In the determination step, the amount of diluent to be added to the thickened slurry is determined based on a relationship model showing the relationship between the concentration of solid matter in the pre-thickening slurry and the concentration of solid matter in the thickened slurry and / or the amount of diluent to be added to the thickened slurry. A method for producing sintered ore.

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