WO2019082749A1

WO2019082749A1 - Sintered ore manufacturing method

Info

Publication number: WO2019082749A1
Application number: PCT/JP2018/038576
Authority: WO
Inventors: 友司岩見; 俊輔野中; 祥和早坂; 直幸竹内
Original assignee: Ｊｆｅスチール株式会社
Priority date: 2017-10-25
Filing date: 2018-10-17
Publication date: 2019-05-02
Also published as: BR112020007400B1; EP3670685A4; BR112020007400A2; EP3670685B1; TW201923299A; CN111263822A; JPWO2019082749A1; JP6665972B2; PH12020550475A1; KR20200057745A; TWI687636B; EP3670685A1; KR102434776B1

Abstract

The purpose of the present invention is to provide a sintered ore manufacturing method which, even when reaction temperature fluctuates during sintering, enables such a fluctuation to be discerned immediately and makes it possible to minimize equipment trouble. This method is for manufacturing a sintered ore by pelletizing, through addition of water, a sintering material which is a mixture of an iron-containing raw material, a CaO-containing raw material, and a setting material, and by sintering the pellets using a sintering machine, the method comprising: a measurement step for continuously measuring a constituent concentration in the sintered ore; and a pallet truck speed adjustment step for adjusting the traveling speed of a pallet truck using the sintered ore constituent concentration measured in the measurement step.

Description

Method of producing sintered ore

The present invention relates to a method for producing sintered ore, and more specifically, a method for producing sintered ore in which the concentration of components of sintered ore is measured, and the concentration of the component is used to adjust the traveling speed of the pallet carriage. About.

In the blast furnace iron making method, iron-containing raw materials such as sintered ore, lump iron ore, and pellets are mainly used as blast furnace raw materials as iron sources. Here, sinter is a source of miscellaneous iron such as iron ore with a particle size of 10 mm or less and various dusts generated in steel mills, CaO-containing raw materials such as limestone, quicklime, steel slag, powder coke and anthracite A drum mixer mixes water with a sinter material containing a coagulant, an MgO-containing material consisting of refined nickel slag, dolomite, serpentine etc. as an optional compounding material, and an SiO ₂ -containing material composed of refined nickel slag, vermiculite (borax) etc. It is a kind of agglomerated ore mixed, granulated and fired while adding.

In recent years, the iron concentration of iron ore contained in the sintering raw material, which is a raw material of sintered ore, is decreased, and instead, the concentration of gangue components such as SiO ₂ and Al ₂ O ₃ is increased. Also, the component concentration of iron ore produced is more unstable as the concentration of the component may differ from ship to ship at the time of import.

Various types of dust generated in the steel works have large variation in the amount of generation and variation in contained carbon. As the fluctuation of the amount of carbon contained in the sintering material becomes large, the reaction temperature of sintering fluctuates.

The variation of the reaction temperature of sintering leads to the variation of the quality of the product product sintered ore (hereinafter also referred to simply as "sintered ore"), which largely affects the quality of the sintered ore. For example, if the amount of heat is excessive, the reaction temperature of sintering rises, and a vitreous low strength structure is formed in the sintered ore, the magnetite structure increases and the reducibility decreases, and so on. Cause a loss of quality. On the other hand, when the heat quantity is insufficient, the reaction temperature of sintering is lowered, and there is a possibility that the sintering reaction does not occur, and in that case, the sintered ore itself can not be obtained. Therefore, controlling the reaction temperature of sintering is essential for maintaining stable sinter quality.

However, it is very difficult to measure the reaction temperature of sintering continuously. For this reason, it is general to estimate the reaction temperature of sintering and analyze the heat content by analyzing the components of the sintered ore. Specifically, the FeO concentration and the residual C concentration of the sintered ore are measured. In the sintering reaction, hematite of the sintered ore undergoes thermal dissociation to magnetite as the temperature rises. As the temperature decreases after the reaction, the magnetite is transformed to hematite again, but the entire amount of the thermally dissociated magnetite does not return to hematite, so when the reaction temperature of sintering is high, much magnetite remains in the sintered ore. Since magnetite contains divalent Fe, the FeO concentration of sintered ore serves as an index indicating the reaction temperature of sintering. Since C remaining in the sintered ore indicates that it was not used as a heat source in the sintering reaction, if the concentration of C remaining in the sintered ore is high, it is suspected that the amount of heat during the sintering reaction is insufficient.

The component measurement of sintered ore and the heat quantity adjustment of sintering reaction are conventionally performed. For example, Patent Document 1 discloses a technique of measuring the FeO concentration of sintered ore, and using the FeO concentration of sintered ore to adjust the coagulating material of the sintering raw material, the granulated water, and the amount of exhaust air. Further, Patent Document 2 discloses a technique of measuring the FeO concentration of sintered ore and adjusting the amount of city gas blown in the sintering machine using the FeO concentration of sintered ore.

Further, in Patent Document 3, a laser type component measuring device is installed on a sintering machine, and the component concentration of the surface layer of the raw material charging layer charged in the pallet measured using the component measuring device is used. A technique is disclosed that estimates the component concentration of sintered ore and uses this to adjust the amount of sintering raw material blended.

Patent No. 1464203 Patent No. 5544784 gazette Japanese Patent Application Laid-Open No. 60-262926

The techniques disclosed in Patent Document 1 and Patent Document 2 measure the FeO concentration of sintered ore, and adjust the amount of coagulating material, granulated water, exhaust air amount, city gas blowing amount to achieve the target value. It is. However, it takes time to reflect these adjustment results in the components of sinter ore, and when the reaction temperature of sintering becomes high, malfunction of the cooler or failure of equipment downstream of the cooler And other equipment problems may occur.

Although the technology disclosed in Patent Document 3 estimates the component concentration of the sintered ore from the component concentration of the surface of the raw material charge layer, the component concentration of the surface of the charge layer is the charging device for the sintering material or the sintering It fluctuates due to segregation accompanying grain size of sintering material. For this reason, the relationship between the component concentration of the surface of the charge layer and the component concentration of the sinter is not uniform, and it is difficult to actually estimate the component concentration of the sinter from the component concentration of the surface of the charge layer .

The present invention has been made in view of the problems of the prior art as described above, and an object thereof is to detect equipment fluctuations even if the reaction temperature of sintering fluctuates, and to solve the equipment troubles of the sinter ore manufacturing apparatus It is an object of the present invention to provide a method of producing sintered ore which can suppress the

The features of the present invention for solving such problems are as follows.
(1) Water is added to a sintering raw material containing an iron-containing raw material, a CaO-containing raw material and a coagulating agent, water is granulated, and it is sintered by a sintering machine to produce a sintered ore A measuring step of continuously measuring the component concentration of the sintered ore, and adjustment of the pallet carriage speed of adjusting the advancing speed of the pallet carriage using the component concentration of the sintered ore measured in the measuring step Process,
A method of producing sintered ore, comprising
(2) The method for producing sintered ore according to (1), wherein at least one of the MgO-containing raw material and the SiO ₂ -containing raw material is further blended into the sintering raw material.
(3) The method for producing sintered ore according to (1) or (2), wherein the concentration of at least one or more of FeO and C of the sintered ore is continuously measured in the measurement step. The production of the sintered ore according to any one of (1) to (3), further comprising the step of adjusting the amount of the sintering raw material by using the concentration of the component of the sintering material. Method.
(5) In the sintering machine, at least one of gaseous fuel and oxygen is blown to sinter the sintering material, and the concentration of the component of the sintered ore is used to inject at least one of the gaseous fuel and the oxygen The manufacturing method of the sintered ore as described in any one of (1) to (4) which further has the adjustment process of the blowing amount which adjusts amount.

By carrying out the method for producing sintered ore according to the present invention, the component concentration of the sintered ore is continuously measured to change the advancing speed of the sintering machine pallet carriage. As a result, the temperature rise of the sintered ore on the outlet side of the cooler can be suppressed, and equipment troubles such as equipment failure of the sintering machine can be suppressed.

FIG. 1: is a schematic diagram which shows an example of the sintered ore manufacturing apparatus 10 which can implement the manufacturing method of the sintered ore which concerns on this embodiment. FIG. 2 is a graph showing the time change of the FeO concentration of sintered ore, the advancing speed of the pallet carriage, the blending ratio of powdered coke, and the temperature of the sintered ore on the outlet side of the cooler in Examples. FIG. 3 is a graph showing the time change of the FeO concentration of sintered ore, the advancing speed of the pallet carriage, the blending ratio of powdered coke, and the temperature of sintered ore on the outlet side of the cooler in the comparative example.

Hereinafter, the present invention will be described through embodiments of the invention. FIG. 1: is a schematic diagram which shows an example of the sintered ore manufacturing apparatus 10 which can implement the manufacturing method of the sintered ore which concerns on this embodiment. The iron-containing raw material 12 stored in the yard 11 is transported to the blending tank 22 by the transport conveyor 14. The iron-containing raw material 12 contains various grades of iron ore and dust generated in a steel mill.

The raw material supply unit 20 includes a plurality of

mixing tanks

22, 24, 25, 26, 28. The iron-containing raw material 12 is stored in the mixing tank 22. In the mixing tank 24, a CaO-containing raw material 16 containing limestone, quick lime, etc. is stored. The mixing tank 25 stores an MgO-containing raw material 17 including dolomite, refined nickel slag, and the like. In the compounding tank 26, a coagulated material 18 containing powdered coke and anthracite which are crushed to a particle size of 1 mm or less using a rod mill is stored. In the compounding tank 28, returned ore 74 (sintered ore sieving powder) having a particle size of 5 mm or less which is under the screen of sintered ore is stored. A predetermined amount of each raw material is cut out and mixed from the

mixing tanks

22, 24, 25, 26, 28 of the raw material supply unit 20, and is made to be a sintering raw material by the transport conveyor 30. The sintering material is conveyed by the conveyance conveyor 30 to the drum mixer 36. The sintering raw material may contain an SiO ₂ -containing raw material. SiO ₂ containing material in this case may be predetermined amount of iron-containing material 12 that is stored in the yard 11, provided separately from the compounding tank for storing the SiO ₂ containing material, it cuts out a predetermined amount from the mixing tank mixing It may be done.

The sintering raw material conveyed to the drum mixer 36 is fed to the drum mixer 36, and an appropriate amount of water 34 is added to granulate into, for example, pseudo particles having an average particle diameter of 3.0 to 6.0 mm. The granulated sintering raw material is conveyed by the conveying conveyor 38 to the sintering raw material supply device 42 of the sintering machine 40. The drum mixer 36 is an example of a granulating apparatus for granulating the sintering material, and a plurality of drum mixers 36 may be used, and instead of the drum mixer 36, a pelletizer granulator may be used. Both the drum mixer 36 and the pelletizer granulator may be used, or a high speed stirrer may be installed upstream of the drum mixer 36 to agitate the sinter material prior to charging into the drum mixer 36. In the present embodiment, the average particle size is an arithmetic average particle size, and Σ (Vi × di) (where Vi is an abundance ratio of particles in the i-th particle size range, and di is the i-th It is a particle size defined in the particle size range). In the sintering machine 40, the sintering raw material granulated by the drum mixer 36 is sintered. The sintering machine 40 is, for example, a lower suction type dwite toroid sintering machine. The sintering machine 40 has a sintering raw material supply device 42, an endless moving pallet carriage 44 which moves in circulation, an ignition furnace 46, and a window box 48. The sintered raw material granulated from the sintered raw material supply device 42 is charged into the pallet of the pallet carriage 44 to form a charged layer of the sintered raw material. The charged bed is ignited by the ignition furnace 46, and the air in the charged bed is drawn downward through the wind box 48 to move the combustion and melting zone in the charged bed below the charged bed. The sintering bed is thereby sintered to form a sintered cake. When the air in the bed is sucked downward through the wind box 48, at least one of gaseous fuel and oxygen may be blown from above the bed. The gaseous fuel is any flammable gas selected from blast furnace gas, coke oven gas, converter gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas and mixed gas thereof.

The sinter cake is crushed by a crusher 50 and made into sintered ore. The sintered ore crushed in the crusher 50 is cooled by the cooler 60. The sintered ore cooled by the cooler 60 is sieved by a sieving apparatus 70 having a plurality of sieves and sifted into a product sintered ore 72 with a particle size of more than 5 mm and a return ore 74 with a particle size of 5 mm or less Be done.

The product sintered ore 72 is transported by the transport conveyor 76 to the blast furnace 82. An infrared analyzer 80 is provided on the transport conveyor 76 that transports the product sintered ore 72. The infrared analyzer 80 performs a measurement process. In the measurement step, the infrared analyzer 80 is used to continuously measure the concentration of at least one or more of FeO and C of the product sintered ore 72.

The infrared analyzer 80 irradiates the product sintered ore 72 with infrared light having a wavelength in the range of 0.5 to 50.0 μm to receive the reflected light from the product sintered ore 72. Since the molecular vibration of FeO contained in the product sintered ore 72 absorbs the inherent wavelength component of the irradiated infrared radiation, the FeO imparts an inherent wavelength component to the reflected infrared radiation. The crystal structure of monoatomic molecules such as C also begins to vibrate upon irradiation with infrared light, and imparts a unique wavelength component to the reflected infrared light. For this reason, the component concentration of FeO and C in the product sintered ore 72 can be measured by analyzing the irradiation infrared radiation and the reflection infrared radiation.

The infrared analyzer 80 emits infrared light of 20 or more wavelengths, for example, at a frequency of 128 times per minute to receive the reflected light reflected by the product sintered ore 72. Thus, since infrared rays can be emitted and received in a short time, the infrared analyzer 80 can continuously measure the concentration of the component of the product sintered ore 72 transported by the transport conveyor 76 online. The infrared analyzer 80 is an example of an analyzer for measuring the concentration of components of the sintering raw material, and instead of the infrared analyzer 80, a laser analyzer that irradiates a laser to the measurement object, a neutron analysis that irradiates neutron to the measurement object It is also possible to use a meter or a microwave analyzer that irradiates the object to be measured with microwaves.

The product sintered ore 72 having a particle size of more than 5 mm is transported by the transport conveyor 76 to the blast furnace 82 and charged into the blast furnace as blast furnace raw material. On the other hand, the return ore 74 having a particle diameter of 5 mm or less is transported by the transport conveyor 78 to the blending tank 28 of the raw material supply unit 20.

Since the product sinter ore 72 is obtained by cooling and sintering the sinter ore crushed by the crusher 50, the sinter ore 74 returned from the product sinter ore 72 and the crusher 50 is used. Is a sintered ore of the same component concentration. For this reason, the infrared analyzer 80 may be provided between the cooler 60 and the sieving device 70, or may be provided on the transport conveyor 78. When the infrared analyzer 80 is provided between the cooler 60 and the sieving device 70, the component concentration of the sintered ore after cooling is measured in the measurement step. When the infrared ray analyzer 80 is provided on the transport conveyor 78, the concentration of the component of the return ore 74 is measured in the measurement process.

In the present embodiment, the particle size of the product sintered ore 72 and the particle size of the return ore 74 mean the particle size to be sieved by a sieve, for example, a particle size of more than 5 mm means using a sieve with an aperture of 5 mm. The particle size to be sieved on a sieve, and the particle size of 5 mm or less is the particle size to be sieved under a sieve using a sieve with an aperture of 5 mm. Each value of the particle size of the product sintered ore 72 and return ore 74 is just an example, and is not limited to this value.

The method of manufacturing sintered ore according to the present embodiment includes the pallet carriage speed adjustment step of adjusting the traveling speed of the pallet carriage. In the pallet carriage speed adjusting step, for example, the advancing speed of the pallet carriage is adjusted using the FeO concentration of the product sintered ore 72 measured in the measurement step.

The high FeO concentration of the product sintered ore 72 indicates that a large amount of magnetite remains in the product sintered ore 72, which indicates that the reaction temperature for sintering is high and the temperature of the sintered cake is high. It is predicted that Therefore, even if the sinter cake is crushed and cooled by the cooler 60, the sintered ore can not be cooled below the upper limit temperature of the outlet of the cooler 60, whereby the abnormal stop of the cooler 60, the cooler There is a possibility that equipment problems such as breakdown of equipment downstream of 60 may occur.

Therefore, the correspondence relationship between the FeO concentration of sintered ore and the sintered ore temperature on the outlet side of the cooler 60 is grasped in advance for each traveling speed of the pallet carriage, and the FeO concentration exceeding the upper limit temperature on the outlet side of the cooler 60 The management value is set in advance. In the adjustment process of the pallet carriage, when the FeO concentration of the product sintered ore 72 rises above the control value, and it is predicted that the sintered ore temperature on the outlet side of the cooler 60 calculated from the above correspondence exceeds the upper limit temperature In addition, adjust the traveling speed of the pallet cart and slow the traveling speed of the pallet cart. When the traveling speed of the pallet carriage is slowed, the time for cooling by the cooler 60 becomes longer, so the temperature of the sintered ore on the outlet side of the cooler 60 becomes lower. As described above, since the temperature of sintered ore on the outlet side of the cooler 60 can be lowered, occurrence of facility trouble such as abnormal stop of the cooler 60 or failure of facilities on the downstream side of the cooler 60 can be suppressed.

In the above example, the FeO concentration of the product sintered ore 72 is continuously measured in the measurement step, and the FeO concentration of the product sintered ore 72 is higher than the control value, and the baking on the outlet side of the cooler 60 calculated from the correspondence relationship Although the example which adjusts the advancing speed of a pallet trolley | bogie is shown when the consolidation temperature exceeds upper limit temperature, it may replace with FeO concentration and you may measure C density | concentration of product sinter 72 in a measurement process. The correspondence between the C concentration of sintered ore and the temperature of the sintered ore on the outlet side of the cooler 60 is grasped beforehand, and the control value of the C concentration exceeding the upper limit temperature on the outlet side of the cooler 60 is determined in advance. Slows the traveling speed of the pallet truck when it rises above the control value. This indicates that the temperature in the width direction of the sintering machine becomes uneven and C is unburned, thereby increasing the C concentration, indicating that unfired sintered ore is discharged. . For this reason, the traveling speed of the pallet carriage is reduced to completely burn C on the sintering machine, and abnormal stop of the cooler 60 due to the combustion of C in the cooler 60 or equipment in the downstream side of the cooler 60 It is possible to suppress the occurrence of equipment problems due to the combustion of C and the like.

In the method for producing a sintered ore according to the present embodiment, the concentration of at least one of FeO and C of the product sintered ore 72 measured in the measurement step is used to adjust the blending amount of the coagulating material of the sintering raw material You may further have the adjustment process of the compounding quantity. For example, even if it is predicted that the FeO concentration of the product sintered ore 72 is higher than the control value and the sintering reaction temperature is expected to be high, the blending amount of the coagulating material should be reduced by the blending amount adjusting process. The reaction temperature of sintering can be lowered. After lowering the reaction temperature of sintering, it is possible to return the advancing speed of the pallet carriage which was slowed down in the adjustment process of pallet carriage speed, and therefore the productivity of sintered ore decreases by slowing the advancing speed of the pallet carriage. Can be suppressed. If the fluctuation of the reaction temperature of sintering can be suppressed by adjusting the compounding amount of the coagulating material, the fluctuation of the FeO concentration of the sintered ore is suppressed, and the quality of the sintered ore becomes high.

The method for producing a sintered ore according to the present embodiment uses the concentration of at least one or more of FeO and C of the sintered ore measured in the measurement step to inject at least one of the gaseous fuel and the oxygen. You may have the adjustment process of the blowing amount to adjust. For example, even if it is predicted that the FeO concentration of the sinter is higher than the control value and the sintering reaction temperature is expected to be high, at least one of the gaseous fuel and oxygen is injected by the adjusting step of the injection amount. By reducing the amount, the high temperature holding time of the reaction temperature of sintering can be shortened. After shortening the high temperature holding time of the sintering reaction temperature, it is possible to return the advancing speed of the pallet carriage that was slowed down in the pallet carriage speed adjustment process, so the productivity declines because the traveling speed of the pallet carriage is slowed down. Can be suppressed. If the reaction temperature fluctuation of the sintering can be suppressed by adjusting the injection amount of at least one of the gaseous fuel and oxygen, the fluctuation of the FeO concentration of the sintered ore is also suppressed, and the quality of the sintered ore becomes high.

In the present embodiment, each raw material is cut out and compounded from the mixing

tanks

22, 24, 25, 26, 28 of the raw material supply unit 20, and is used as the sintering raw material by the transport conveyor 30 and sintered raw material granulated by the drum mixer 36. An example is shown, but it is not limited to this. For example, a sintering raw material containing iron-containing raw material 12, CaO-containing raw material 16, MgO-containing raw material 17 and return ore 74 is charged into drum mixer 36, water is added to the sintering raw material and granulated, By charging the coagulating material 18 in the second half, the carbonaceous material exterior particles in which the coagulating material 18 is present in the surface layer may be used as a granulated sintering material.

A sintered raw material containing iron-containing raw material 12, CaO-containing raw material 16, MgO-containing raw material 17 and return ore 74, and a part of coagulating material 18 is charged into drum mixer 36, and water is added to the sintered raw material. The granulated carbon raw material is formed by granulating the carbonaceous material exterior particles in which the coagulating material 18 is present in the surface layer of the granulated sintering raw material by charging the remaining portion of the coagulating material 18 in the second half of the granulation. It may be used as Powdered coke and anthracite are used as a coagulating material to which water is added and which is mixed in the second half of granulation.

In the case where a plurality of drum mixers 36 are provided, and in the case of using a carbon material exterior particle in which the coagulating material 18 is present in the surface layer, a part or all of the coagulating material 18 is introduced in the second half of the last drum mixer 36 The carbonaceous material exterior particles in which the coagulating material 18 is present in the surface layer may be granulated by charging the sintering material into the drum mixer 36 by the method described above. Furthermore, when a plurality of drum mixers 36 are used, all the water may be added to the sintering raw material by the first drum mixer 36, and part of the water may be added by the first drum mixer 36. May be added, and the remainder may be added by another drum mixer 36.

tanks

22, 24, 25, 26, 28 of the raw material supply unit 20, and is used as the sintering raw material by the transport conveyor 30 and sintered raw material granulated by the drum mixer 36. An example is shown, but it is not limited to this. For example, a sintered raw material containing iron-containing raw material 12, MgO-containing raw material 17 and return ore 74 is charged into drum mixer 36, water is added to the sintered raw material and granulated, CaO-containing raw material in the latter half of granulation Granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer may be used as the granulated sintering raw material by charging 16 and the coagulating material 18.

A sinter material containing a part of the iron-containing material 12, the MgO-containing material 17, the reversion ore 74, and the coagulating material 18 is charged into a drum mixer 36, water is added to the sinter material, and granulation is carried out Sintered granulated particles in which iron-containing raw material 12 and CaO-containing raw material 16 are present in the surface layer by charging the remainder of iron-containing raw material 12 and CaO-containing raw material 16 in the latter half of granulation You may use as a raw material.

A sintered raw material containing iron-containing raw material 12, return ore 74 and MgO-containing raw material 17 and a part of CaO-containing raw material 16 is charged into drum mixer 36, water is added to the sintered raw material, and granulation is carried out By blending the remaining portion of the CaO-containing raw material 16 and the coagulating material 18 in the latter half of the grain time, granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer are used as granulated sintering raw material Good.

A sintering raw material in which iron containing raw material 12, returned ore 74 and MgO containing raw material 17, a part of CaO containing raw material 16 and a part of coagulating material 18 are mixed is supplied to drum mixer 36, and water is used as a sintering raw material. Is added and granulated, and the remaining portion of the CaO-containing raw material 16 and the remaining portion of the coagulating material 18 are compounded in the latter half of the granulation to obtain granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer You may use as a granulated sintering raw material.

In the case of using a plurality of drum mixers 36 and granulating particles in which the CaO-containing raw material 16 or the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer, part or all of the CaO-containing raw material Granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer by charging the sintering material 16 and the coagulating material 18 in the latter half of the last drum mixer 36 and injecting the sintering material into the drum mixer 36 by the method described above May be granulated.

In the present embodiment, each raw material is cut out and mixed from the mixing

tanks

22, 24, 25, 26, 28 of the raw material supply unit 20, and the example of using the transport conveyor 30 as the sintering raw material is shown. . For example, a portion of each raw material cut out from the mixing

tanks

22, 24, 25, 26 and 28 of the raw material supply unit 20 is directly conveyed to the drum mixer 36 by the conveyance conveyor 30, and the remaining portion is conveyed by a conveyance conveyor different from the conveyance conveyor 30. After being conveyed to a high-speed stirring device and stirred, it is granulated by a granulator such as a drum mixer 36 or a pelletizer, dried if necessary by a drier, and then charged into the conveyer 30 or conveyer 38 Good. After being subjected to the stirring process, it may be directly fed to the conveyer 30 without being granulated by a drum mixer 36 or a granulator such as a pelletizer. Furthermore, at least one of the crushing step and the sieving step may be provided before the stirring process with the high speed stirring device. In the case where a plurality of drum mixers 36 are used, they may be fed to a conveyer between any drum mixers.

Furthermore, the infrared analyzer 80 in the measurement process is not limited to one, and a plurality of infrared analyzers may be provided. A plurality of infrared analyzers 80 may be used to measure the concentration of at least one or more of FeO and C of sinter.

The sintered ore was manufactured using the sintered ore manufacturing apparatus 10 shown in FIG. In both the embodiment and the comparative example, the infrared analyzer 80 is installed on the conveyer 76, and the FeO concentration is continuously measured at a frequency of 18 times per hour as the component concentration of the sintered ore, and the measured FeO concentration is used. Sintered ore was manufactured for 5 hours by adjusting the blending ratio of the coke breeze which is the condensation material so that the FeO concentration of the sintered ore becomes the control value of FeO. Both of the example and the comparative example were changed to a raw material pile containing dust with a high C concentration after 1 hour.

The embodiment is an example having a pallet carriage speed adjusting step of adjusting the advancing speed of the sintering machine pallet carriage, and the comparative example is an example not having the pallet carriage speed adjusting step. Therefore, when the FeO concentration in the sinter is increased, the traveling speed of the pallet carriage is slowed in the embodiment and the blending ratio of the coke breeze is adjusted to cope with it, and the traveling speed of the pallet carriage is adjusted in the comparative example. First, the blending ratio of coke breeze was adjusted.

FIG. 2 shows the FeO concentration (mass%) of the sintered ore, the advancing speed of the pallet carriage (m / min), the blending ratio of powdered coke (mass%), and the sintered ore temperature (° C.) of the cooler in the example. It is a graph which shows the time change of. FIG. 3 shows the FeO concentration (mass%) of sintered ore, the advancing speed of pallet truck (m / min), the blending ratio of powdered coke (mass%), and the sintered ore temperature (° C.) of the cooler in the comparative example. It is a graph which shows the time change of.

Since there is a measurement step of continuously measuring the FeO concentration of the sintered ore by the infrared analyzer 80, it is possible to detect early that the FeO concentration of the sintered ore is higher than the FeO control value after changing the raw material pile. Since it was detected that the reaction temperature of sintering increased from the rise of FeO concentration and the temperature of the sintered ore on the outlet side of the cooler exceeded the upper limit temperature, in the embodiment, the sintering machine is used in the pallet truck speed adjustment process. The traveling speed of the pallet truck was slowed and the proportion of coke breeze was adjusted. As a result, the rise in the temperature of the sintered ore on the outlet side of the cooler was suppressed, and the operation could be performed without exceeding the upper limit temperature on the outlet of the cooler. After the FeO concentration returned to the control value by adjusting the blending ratio of the coke breeze coke, the traveling speed of the pallet truck was returned to the original speed. Thereby, the fall of productivity of sinter could also be suppressed.

Thus, in the method for producing sintered ore according to the present embodiment, the FeO concentration of the sintered ore is continuously measured, and when the increase of the FeO concentration of the sintered ore is detected, the advancing speed of the sintering machine pallet carriage Adjust the As a result, it has been confirmed that the rise in the temperature of the sintered ore on the outlet side of the cooler can be suppressed, the load on the cooler and the subsequent facilities can be reduced, and equipment troubles such as equipment failure can be avoided.

Also in the comparative example, it was detected that the temperature of the sintered ore on the outlet side of the cooler exceeded the upper limit temperature from the increase of the FeO concentration of the sintered ore, so the proportion of coke breeze was adjusted. However, the temperature of the sintered ore at the outlet of the cooling machine is lowered after about 30 minutes required for replacing the material already charged in the sintering machine after adjusting the blending ratio of the coke breeze. Before that, the temperature of the sintered ore rose above the upper limit temperature on the outlet side of the cooler, resulting in abnormal shutdown of the cooler. After stopping the cooling machine and the pallet carriage, the temperature of the sintering machine is lowered, so the proportion of coke breeze of the sintering raw material is increased, and the advancing speed of the pallet carriage is slowed down. Production has resumed.

In both the example and the comparative example, the increase in the FeO concentration of the sinter is detected, and the reaction temperature of the sinter is increased when it is detected that the temperature of the sinter at the outlet of the cooler exceeds the upper temperature limit. The sintering raw material derived from the raw material pile containing dust with a high C concentration is loaded on the pallet of the sintering machine pallet carriage. In the comparative example, the blending ratio of powdered coke is adjusted, but the adjustment of the blending ratio is reflected from the sintered raw material cut out from the raw material supply portion and blended from this, and is already loaded into the pallet. It is not reflected in the sintering material. For this reason, in the comparative example, the temperature of the sintered ore rose due to the increase of the reaction temperature of sintering, and the temperature of the sintered ore exceeded the upper limit temperature on the outlet side of the cooler. As a result, equipment trouble such as abnormal stop of the cooler occurred.

In the embodiment, when an increase in FeO concentration of sintered ore is detected, and it is detected that the temperature of the sintered ore on the outlet side of the cooler exceeds the upper limit temperature, the advancing speed of the pallet To slow down. This makes it possible to prolong the time for cooling by the cooler from the sintering material already charged in the pallet, so that even if the reaction temperature of the sintering of the sintering material rises, the amount of sintered ore at the outlet of the cooler The temperature rise can be suppressed, and thereby problems such as abnormal stop of the cooling machine and equipment failure can be suppressed. In this embodiment, an example is shown in which the measurement frequency of the infrared analyzer 80 installed on the transport conveyor 76 is 18 times per hour, but the effect of adjusting the pallet truck speed can be obtained even if the measurement frequency is lower than this. The measurement frequency may be at least once every about 30 minutes required to replace the raw material charged in the sintering machine.

As described above, in the method for producing sinter ore according to the present embodiment, an increase in the reaction temperature of sintering is promptly detected by continuously measuring the FeO concentration of the sinter ore by the measurement step, and the pallet carriage speed is adjusted. Slow down the traveling speed of the pallet cart in the process. Thereby, for example, even if the reaction temperature of sintering rises by changing to a raw material pile containing dust with a high C concentration, the temperature rise of sintered ore on the outlet side of the cooler can be suppressed, and the cooler It has been confirmed that equipment problems such as abnormal stop of the equipment and equipment failure of the sintering machine can be suppressed.

DESCRIPTION OF SYMBOLS 10 sintered ore manufacturing apparatus 11 yards 12 iron containing raw material 14 conveyer 16 CaO containing raw material 17 MgO containing raw material 18 coagulating material 20 raw material supply part 22 compounding tank 24 compounding tank 25 compounding tank 26 compounding tank 28 compounding tank 30 conveying conveyor 34 water 36 Drum Mixer 38 Conveying Conveyor 40 Sintering Machine 42 Sintered Raw Material Supply Device 44 Pallet Carriage 46 Ignition Furnace 48 Windbox 50 Crusher 60 Cooling Machine 70 Sieving Device 72 Products Sintered Ore 74 Returning Ore 76 Conveying Conveyor 78 Conveying Conveyor 80 Infrared analyzer 82 blast furnace

Claims

Water is added to a sintering raw material containing an iron-containing raw material, a CaO-containing raw material and a coagulating agent, water is granulated, and it is sintered in a sintering machine to produce a sintered ore. ,
Measuring continuously measuring the concentration of the component of the sintered ore;
Adjusting the speed of the pallet carriage using the concentration of the component of the sintered ore measured in the measurement step; adjusting the speed of the pallet carriage;
A method of producing sintered ore, comprising
The method for producing sintered ore according to claim 1, wherein at least one of a MgO-containing raw material and an SiO 2 -containing raw material is further blended into the sintered raw material.
The method for producing sintered ore according to claim 1 or 2, wherein the concentration of at least one or more of FeO and C of the sintered ore is continuously measured in the measurement step.
The sintered ore according to any one of claims 1 to 3, further comprising an adjusting step of the compounding amount for adjusting the compounding amount of the coagulating material of the sintering raw material using the component concentration of the sintered ore. Manufacturing method.
In the sintering machine, at least one of gaseous fuel and oxygen is blown to sinter the sintering raw material,
The method according to any one of claims 1 to 4, further comprising an adjusting step of an injection amount adjusting an injection amount of at least one of the gaseous fuel and the oxygen using a component concentration of the sinter ore. The manufacturing method of the sinter described above.