JP2021120479A - Method for producing sintered ore and sintering machine - Google Patents

Method for producing sintered ore and sintering machine Download PDF

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JP2021120479A
JP2021120479A JP2020014357A JP2020014357A JP2021120479A JP 2021120479 A JP2021120479 A JP 2021120479A JP 2020014357 A JP2020014357 A JP 2020014357A JP 2020014357 A JP2020014357 A JP 2020014357A JP 2021120479 A JP2021120479 A JP 2021120479A
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一昭 片山
Kazuaki Katayama
一昭 片山
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Nippon Steel Corp
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Abstract

To improve yield while maintaining a production rate improvement effect by a two-stage ignition sintering method.SOLUTION: A method for producing sintered ore includes the steps of: charging raw material for sintered ore containing condensation material into a sintering machine so as to be two stages in a layer height direction, to form a lower-stage raw material filling layer and upper-stage raw material filling layer; and igniting the lower-stage raw material filling layer and the upper-stage raw material filling layer, respectively, with a lower-stage igniter and an upper-stage igniter, and sucking in an oxygen-containing gas from below the lower-stage raw material filling layer. Of the total content of the condensation material in the lower-stage raw material filling layer, at least 2.0 mass% is sprayed over a surface layer of the lower-stage raw material filling layer ignited with the lower-stage igniter and supplied.SELECTED DRAWING: Figure 2

Description

本発明は、高炉原料用の焼結鉱を製造する焼結鉱の製造方法および焼結機に関する。 The present invention relates to a method for producing sinter and a sinter for producing sinter for blast furnace raw materials.

現在、高炉製銑の主原料は、焼結鉱である。焼結鉱は、通常、次のように製造される。まず、焼結鉱製造用の原料として、鉄鉱石（粉）等の鉄原料、スケール・製鉄ダスト等の含鉄雑原料、橄欖岩等のＭｇＯ含有副原料、石灰石等のＣａＯ含有副原料、返鉱、燃焼熱によって焼結鉱を焼結（凝結）させる燃料となる炭材(凝結材)などを、所定の割合で混合する。混合した配合原料を造粒して配合原料造粒物とする。次に、配合原料造粒物を、ホッパより、下方吸引式のドワイトロイド（ＤＬ）式焼結機のパレット（焼結パレット）上に搭載して、原料充填層を形成する。形成した原料充填層の上部（表面）から、点火炉（点火器）により原料充填層中の炭材に点火する。そして、パレットを連続的に移動させながらパレットの下方から空気を吸引する。吸引により原料充填層内に酸素を供給し、原料充填層中の炭材の燃焼を上部から下部に向けて進行させて、炭材の燃焼熱により原料充填層を順次焼結させる。焼結により得られた焼結部（シンターケーキ）は、所定の粒度に粉砕、篩分け等により整粒され、高炉の原料である焼結鉱となる。 Currently, the main raw material for blast furnace ironmaking is sinter. Sintered ore is usually produced as follows. First, as raw materials for sinter production, iron raw materials such as iron ore (powder), iron-containing miscellaneous raw materials such as scale and iron-making dust, MgO-containing auxiliary raw materials such as sinter, CaO-containing auxiliary raw materials such as limestone, and return ore. , A carbon material (condensing material) as a fuel for sintering (coagulating) the sintered ore by the heat of combustion is mixed at a predetermined ratio. The mixed compounded raw material is granulated to obtain a compounded raw material granulated product. Next, the compounded raw material granulated product is mounted on a pallet (sintered pallet) of a downward suction type Dwightroid (DL) type sintering machine from a hopper to form a raw material filling layer. From the upper part (surface) of the formed raw material filling layer, the charcoal material in the raw material filling layer is ignited by an ignition furnace (igniter). Then, air is sucked from below the pallet while continuously moving the pallet. Oxygen is supplied into the raw material filling layer by suction, combustion of the charcoal material in the raw material filling layer proceeds from the upper part to the lower part, and the raw material filling layer is sequentially sintered by the combustion heat of the carbonaceous material. The sintered portion (sinter cake) obtained by sintering is pulverized to a predetermined particle size, sized by sieving, etc., and becomes a sintered ore which is a raw material of a blast furnace.

このようなＤＬ式焼結機による焼結鉱の製造方法において、原料充填層の形成と点火を二段以上の多段で行う多段装入多段点火焼結法が提案されている。多段装入多段点火焼結法は、造粒した配合原料を焼結機の層高方向に順次に装入して多段（二段以上）の原料充填層を形成するとともに各原料充填層の表面に点火し、下方から空気を吸引することにより、各層の焼結反応を同時並行に進行させて焼結する方法である。 In the method for producing a sintered ore by such a DL type sinter, a multi-stage charging multi-stage ignition sintering method in which a raw material filling layer is formed and ignition is performed in multiple stages of two or more stages has been proposed. In the multi-stage charging multi-stage ignition sintering method, the granulated compounded raw materials are sequentially charged in the layer height direction of the sintering machine to form a multi-stage (two or more stages) raw material filling layer and the surface of each raw material filling layer. Is ignited and air is sucked from below, so that the sintering reaction of each layer proceeds in parallel at the same time to sinter.

図１は、多段装入多段点火焼結法の一例である二段装入二段点火焼結法に使用するＤＬ式焼結機の概要図である。図１を参照して、造粒した配合原料を二段に装入して、上段原料充填層（以下、上段層という）と下段原料充填層（以下、下段層という）とを形成し、上段層と下段層のそれぞれに点火して焼結を実施する二段装入二段点火焼結法について説明する。 FIG. 1 is a schematic view of a DL type sintering machine used in a two-stage charging two-stage ignition sintering method, which is an example of a multi-stage charging multi-stage ignition sintering method. With reference to FIG. 1, the granulated compounding raw material is charged in two stages to form an upper raw material filling layer (hereinafter referred to as an upper layer) and a lower raw material filling layer (hereinafter referred to as a lower layer). A two-stage charging two-stage ignition sintering method in which each of the layer and the lower layer is ignited to perform sintering will be described.

図１に示す例では、上段層を形成する上段用配合原料と、下段層を形成する下段用配合原料とが別系統（２系統）で準備されて、別系統でＤＬ式焼結機１００のパレット（図示は省略）上に装入される。具体的には、下段用の原料は、下段原料槽群１Ｄの各原料槽（１Ｄ１〜１ＤＸ）内に貯留され、必要な種類と量の原料が所定の割合で切り出されて配合される。配合された下段用の原料（下段用配合原料）は、下段用ドラムミキサー１Ａに投入されて混合され、水分が加えられて造粒される。また、上段用の原料は、上段原料槽群２Ｄの各原料槽（２Ｄ１〜２ＤＸ）内に貯留され、必要な種類と量の原料が所定の割合で切り出されて配合される。配合された上段用の原料（上段用配合原料）は、上段用ドラムミキサー２Ａに投入されて混合され、水分が加えられて造粒される。 In the example shown in FIG. 1, the upper compounding raw material forming the upper layer and the lower compounding material forming the lower layer are prepared in separate systems (two systems), and the DL type sintering machine 100 is prepared in another system. It is loaded on a pallet (not shown). Specifically, the raw material for the lower stage, stored in each raw material tank of the lower raw material tank group 1D (1D 1 ~1D X) in the required type and amount of the raw material is blended with cut out at a predetermined rate .. The blended raw material for the lower stage (blended raw material for the lower stage) is charged into the drum mixer 1A for the lower stage, mixed, and water is added to granulate. Further, the raw materials for the upper stage are stored in each raw material tank (2D 1 to 2D X ) of the upper raw material tank group 2D, and the required types and amounts of raw materials are cut out at a predetermined ratio and blended. The blended raw material for the upper stage (blended raw material for the upper stage) is charged into the upper drum mixer 2A, mixed, and water is added to granulate.

造粒された下段用配合原料（下段用配合原料造粒物）は、下段用ホッパ１Ｂから、床敷鉱を敷きつめたパレット上に装入されて、下段層１０（下段原料充填層）を形成する。下段層１０は、パレットをパレット進行方向５へ移動させることにより、下段用点火器１Ｃ下まで移動し、そこで、下段用点火器１Ｃにより下段層１０表面の炭材に点火される。点火後、パレット下の風箱（図示は省略）を介して、下方から空気を吸引する下方吸引６により、下段層１０の焼結が開始される。下段層１０の焼結は、引き続く下方吸引６により下方に進行し、下段層燃焼帯１０Ａを形成する。 The granulated lower compound raw material (lower compound raw material granulated product) is charged from the lower hopper 1B onto a pallet lined with bedding ore to form the lower layer 10 (lower raw material filling layer). do. The lower layer 10 moves to the bottom of the lower igniter 1C by moving the pallet in the pallet traveling direction 5, where the carbon material on the surface of the lower layer 10 is ignited by the lower igniter 1C. After ignition, the lower layer 10 is started to be sintered by the lower suction 6 that sucks air from below through the air box (not shown) under the pallet. Sintering of the lower layer 10 proceeds downward by the subsequent downward suction 6, and forms the lower layer combustion zone 10A.

焼結が開始された下段層１０が上段用ホッパ２Ｂ下まで移動したとき、上段用ドラムミキサー２Ａにより造粒された上段用配合原料（上段用配合原料造粒物）が、上段用ホッパ２Ｂから、点火後の下段層１０上に装入されて、上段層２０（上段原料充填層）を形成する。上段層２０は、パレットをパレット進行方向５へ移動させることにより、上段用点火器２Ｃ下まで移動し、そこで、上段用点火器２Ｃにより上段層２０表面の炭材に点火される。点火後、下方吸引６により、上段層２０の焼結が開始される。上段層２０の焼結は、引き続く下方吸引６により下方に進行し、上段層燃焼帯２０Ａを形成する。 When the lower layer 10 from which sintering has started moves to the bottom of the upper hopper 2B, the upper compounded raw material (upper compounded raw material granulated product) granulated by the upper drum mixer 2A is released from the upper hopper 2B. , It is charged onto the lower layer 10 after ignition to form the upper layer 20 (upper raw material filling layer). The upper layer 20 moves to the bottom of the upper igniter 2C by moving the pallet in the pallet traveling direction 5, where the carbon material on the surface of the upper layer 20 is ignited by the upper igniter 2C. After ignition, the lower suction 6 starts sintering of the upper layer 20. The sintering of the upper layer 20 proceeds downward by the subsequent downward suction 6, and forms the upper layer combustion zone 20A.

下段層１０の下段層燃焼帯１０Ａ、および、上段層２０の上段層燃焼帯２０Ａは、その後の更なる下方吸引６により、同時並行で焼結が進行し下降する。下段層燃焼帯１０Ａ、上段層燃焼帯２０Ａがそれぞれの層の最下部まで到達すると、炭材の燃焼による焼結が終了し、焼結部３となる。最終的に、焼結が完了した焼結部３は、パレット終端より排鉱される。 The lower layer combustion zone 10A of the lower layer 10 and the upper layer combustion zone 20A of the upper layer 20 are simultaneously sintered and lowered by the further downward suction 6. When the lower layer combustion zone 10A and the upper layer combustion zone 20A reach the bottom of each layer, sintering by combustion of the carbonaceous material is completed, and the sintered portion 3 is formed. Finally, the sintered portion 3 that has been sintered is discharged from the end of the pallet.

二段装入二段点火焼結法においては、原料充填層を二段にして、二段で同時に焼結を進行させるため、生産量をほぼ倍増させることができる。また、上段層２０の焼結に使用された排ガスを、下方吸引により下段層１０の焼結に再使用するため、排ガス量を低減（半減）させることができる。 In the two-stage charging two-stage ignition sintering method, the raw material filling layer is made into two stages, and the sintering proceeds simultaneously in the two stages, so that the production amount can be substantially doubled. Further, since the exhaust gas used for sintering the upper layer 20 is reused for sintering the lower layer 10 by downward suction, the amount of exhaust gas can be reduced (halved).

多段装入多段点火焼結法については、特許文献１〜３などに開示がある。特許文献１には、多段装入多段点火焼結法は各層の原料の供給比率を変えることができるため、上段層２０と下段層１０の原料の粒度調整などにより、歩留の向上などが得られることが記載されている。 The multi-stage charging multi-stage ignition sintering method is disclosed in Patent Documents 1 to 3. According to Patent Document 1, since the multi-stage charging multi-stage ignition sintering method can change the supply ratio of the raw materials of each layer, the yield can be improved by adjusting the particle size of the raw materials of the upper layer 20 and the lower layer 10. It is stated that it will be done.

特許文献２や特許文献３には、二段装入二段点火焼結法の問題点として、下段層１０の焼結鉱の焼結強度が低下する点が指摘されている。具体的には、二段装入二段点火焼結法においては、上述のように、上段層２０の焼結に使用されて酸素分圧が低下したガス（排ガス）が、下方吸引６により下段層１０に供給され、下段層１０の焼結に使われる。そのため、下段層１０では低酸素分圧下での焼結となる。下段層１０中の炭材の燃焼が不完全となり、焼結に必要な熱量が不足する。熱量不足により、下段層１０の焼結反応の進行が妨げられ、下段層１０の焼結鉱の強度が低下する。 Patent Document 2 and Patent Document 3 point out that the problem of the two-stage charging two-stage ignition sintering method is that the sintering strength of the sinter of the lower layer 10 is lowered. Specifically, in the two-stage charging two-stage ignition sintering method, as described above, the gas (exhaust gas) used for sintering the upper layer 20 and whose oxygen partial pressure is lowered is discharged to the lower stage by the downward suction 6. It is supplied to the layer 10 and used for sintering the lower layer 10. Therefore, the lower layer 10 is sintered under a low oxygen partial pressure. The combustion of the carbonaceous material in the lower layer 10 becomes incomplete, and the amount of heat required for sintering becomes insufficient. Due to the insufficient amount of heat, the progress of the sinter reaction of the lower layer 10 is hindered, and the strength of the sinter of the lower layer 10 decreases.

この問題の解決方法として、特許文献２には、下段層１０の焼結鉱の焼結強度を向上させるべく、焼結しようとする製鉄原料中の固定炭素濃度を全層平均で３．３％以下とし、かつ上段層２０の固定炭素濃度を低く、下段層１０の固定炭素濃度を高くすることが記載されている。特許文献３には、下段系の配合原料のうち、炭材以外の主配合原料を造粒機で造粒する下段系造粒工程と、下段系造粒工程の後半から主配合原料の造粒物を焼結機の下段系ホッパ内に装入する前までの間に主配合原料に炭材を投入する炭材投入工程と、主配合原料の造粒物および炭材を焼結機内に装入して、焼結鉱を製造する方法が記載されている。 As a solution to this problem, Patent Document 2 states that in order to improve the sintering strength of the sinter in the lower layer 10, the concentration of fixed carbon in the steelmaking raw material to be sintered is 3.3% on average for all layers. It is described that the fixed carbon concentration of the upper layer 20 is lowered and the fixed carbon concentration of the lower layer 10 is increased. In Patent Document 3, among the lower-stage compounding raw materials, the lower-stage granulation step of granulating the main compounding raw material other than the carbonaceous material with a granulator, and the granulation of the main compounding raw material from the latter half of the lower-stage granulation process. The carbon material charging process in which the carbonaceous material is charged into the main compounding raw material before the material is charged into the lower hopper of the sintering machine, and the granulated product and carbonaceous material of the main compounding raw material are loaded in the sintering machine. A method of entering and producing a sintered ore is described.

特開昭４７−２６３０４号公報Japanese Unexamined Patent Publication No. 47-26304 特開昭６２−６０８２９号公報Japanese Unexamined Patent Publication No. 62-60829 特開２０１８−１７８１４８号公報Japanese Unexamined Patent Publication No. 2018-178148

特許文献２では、固定炭素濃度の全層平均濃度に上限を設け、さらに上段層２０のコークス配合比を低くするため、上段層２０への供給熱量が低下し、上段層２０での焼結鉱の冷間強度低下を招くことになってしまう。特許文献３には、下段系の配合原料において炭材の後添加を行うことにより、炭材がガスと接触しやすくなり、炭材の燃焼が促進されて、下段層１０の焼結鉱の生産性を改善するものであるが、炭材を後添加するための設備が必要となる。 In Patent Document 2, since the upper limit of the average concentration of fixed carbon in all layers is set and the coke mixing ratio of the upper layer 20 is further lowered, the amount of heat supplied to the upper layer 20 is reduced, and the sintered ore in the upper layer 20 is reduced. Will cause a decrease in cold strength. According to Patent Document 3, by post-adding the charcoal material in the lower compounding raw material, the charcoal material easily comes into contact with the gas, the combustion of the charcoal material is promoted, and the sinter of the lower layer 10 is produced. Although it improves the productivity, equipment for post-adding carbonaceous material is required.

本発明は、上記の問題に鑑みて新規に創案された焼結鉱の製造方法および焼結機である。本発明の目的は、二段装入二段点火焼結法（以下、単に二段点火焼結法ともいう。）における下段原料充填層の焼結鉱の強度低下の抑制と、歩留の改善とを可能とする焼結鉱の製造方法および焼結機を提供することにある。 The present invention is a sinter manufacturing method and a sinter machine newly devised in view of the above problems. An object of the present invention is to suppress a decrease in the strength of the sinter in the lower raw material filling layer in the two-stage charging two-stage ignition sintering method (hereinafter, also simply referred to as a two-stage ignition sintering method) and to improve the yield. It is an object of the present invention to provide a method for producing a sinter and a sinter machine capable of the above.

本発明は、上記の課題を解決するためになされたものであり、その要旨とするところは、以下のとおりである。
（１）焼結機内に、凝結材を含む焼結鉱の原料を装入する際に、層高方向において二段となるように装入して、下段原料充填層および上段原料充填層を形成する工程と、
前記下段原料充填層および前記上段原料充填層を、下段用点火器および上段用点火器により、それぞれ点火するとともに、前記下段原料充填層の下方から酸素含有ガスを吸引する工程とを含み、
前記下段原料充填層における全凝結材配合量のうち２．０質量％以上を、前記下段用点火器により点火された前記下段原料充填層の表層に散布して供給する、
ことを特徴とする焼結鉱の製造方法。
（２）前記下段原料充填層の表層に散布して供給する凝結材量は、前記下段原料充填層における全凝結材配合量のうち１１．０質量％未満とする、
ことを特徴とする（１）に記載の焼結鉱の製造方法。
（３）循環移動する複数の焼結パレットと、
前記焼結パレット内に、一部の凝結材を除いた下段系配合原料を装入して下段原料充填層を形成する下段用ホッパと、
前記下段原料充填層上に上段系配合原料を装入して上段原料充填層を形成する上段用ホッパと、
前記下段原料充填層の表面および前記上段原料充填層の表面にそれぞれ点火する下段用点火器および上段用点火器と、
前記下段原料充填層中および前記上段原料充填層中の酸素含有ガスを下方に吸引する下方吸引装置と、を備えた下方吸引式の焼結機であって、
前記焼結パレットが前記下段用点火器から前記上段用ホッパまで搬送される区間内において、前記下段原料充填層の表層に、前記一部の凝結材を散布して供給する凝結材散布装置が配設されている、
ことを特徴とする焼結機。 The present invention has been made to solve the above problems, and the gist thereof is as follows.
(1) When the raw material of the sintered ore containing the coagulant is charged into the sinter, the raw material is charged in two stages in the layer height direction to form the lower raw material filling layer and the upper raw material filling layer. And the process of
The lower raw material filling layer and the upper raw material filling layer are ignited by the lower igniter and the upper igniter, respectively, and the step of sucking oxygen-containing gas from below the lower raw material filling layer is included.
2.0% by mass or more of the total amount of the coagulant compounded in the lower raw material filling layer is sprayed and supplied to the surface layer of the lower raw material filling layer ignited by the lower igniter.
A method for producing a sinter, which is characterized in that.
(2) The amount of the coagulant to be sprayed and supplied to the surface layer of the lower raw material filling layer shall be less than 11.0% by mass of the total amount of the coagulant blended in the lower raw material filling layer.
The method for producing a sinter according to (1).
(3) Multiple sintered pallets that circulate and move,
A lower hopper for forming a lower raw material filling layer by charging a lower compound raw material excluding a part of the coagulant into the sintered pallet.
An upper hopper for forming an upper raw material filling layer by charging an upper mixed raw material onto the lower raw material filling layer.
A lower igniter and an upper igniter that ignite the surface of the lower raw material filling layer and the surface of the upper raw material filling layer, respectively.
A lower suction type sintering machine provided with a lower suction device for sucking oxygen-containing gas in the lower raw material filling layer and the upper raw material filling layer downward.
Within the section where the sintered pallet is transported from the lower igniter to the upper hopper, a coagulant spraying device for spraying and supplying a part of the coagulant to the surface layer of the lower raw material filling layer is arranged. It is set up
A sintering machine characterized by that.

本発明によれば、下段原料充填層の表層（表面）に凝結材を散布することにより、二段点火焼結法による生産率改善効果を維持しつつ、歩留を改善することができる。 According to the present invention, by spraying the coagulant on the surface layer (surface) of the lower raw material filling layer, the yield can be improved while maintaining the productivity improving effect of the two-stage ignition sintering method.

二段点火焼結法に使用するＤＬ式焼結機の概要図である。It is a schematic diagram of the DL type sintering machine used for the two-stage ignition sintering method. 本発明の一実施形態である二段点火焼結法に使用するＤＬ式焼結機の概要図である。It is a schematic diagram of the DL type sintering machine used for the two-stage ignition sintering method which is one Embodiment of this invention.

二段点火焼結法は、上述のように、下段原料充填層（下段層１０）における焼結鉱の焼結強度の低下が問題となる。本発明者は、下段層焼結鉱の強度低下が問題となる二段点火焼結法について改善手段を種々検討した結果、凝結材を下段層１０表層に散布することで、二段点火法の生産率改善効果を維持したまま、下段層１０の焼結鉱の強度および歩留が改善されることを見出した。本発明者は、凝結材散布の条件が異なる焼結鍋試験を行い、凝結材散布量の適切な範囲を求めた。本発明は、かかる知見に基づいて創案された。 As described above, the two-stage ignition sintering method has a problem of lowering the sintering strength of the sinter in the lower raw material filling layer (lower layer 10). As a result of various studies on improvement means for the two-stage ignition sintering method in which the decrease in strength of the lower layer sinter is a problem, the present inventor sprays the coagulant on the surface layer of the lower layer 10 to obtain the two-stage ignition method. It was found that the strength and yield of the sinter in the lower layer 10 are improved while maintaining the effect of improving the productivity. The present inventor conducted a sintering pot test under different conditions for spraying the coagulant, and determined an appropriate range of the amount of the coagulant sprayed. The present invention was devised based on such findings.

本発明は、二段点火焼結法において、下段層表層に凝結材（炭材）散布を行うことにより、下段層への入熱を増加させることに特徴がある。具体的には、下段層（下段原料充填層１０）における全凝結材配合量のうち２．０質量％以上を、点火された下段層の表層に散布して供給する。凝結材は、点火された下段層表層上に散布されることにより昇温し、着火温度に達して燃焼する。凝結材の燃焼により下段層表層の最高到達温度が上昇し、かつ下段層表層の下方の層への熱の供給量が増加する。また、下段用点火器１Ｃよりも下流側で凝結材を散布することにより、下段層燃焼帯１０Ａのパレット進行方向５における幅が拡大する。よって、下段層焼結鉱の強度および歩留が改善する。なお、下段層の表層に散布して供給する凝結材量は、下段層における全凝結材配合量のうち１１．０質量％未満とすることが好ましい。なお、これらの設定根拠については、後述する実施例で述べる。下段層表層への凝結材の散布は、パレットが下段用点火器１Ｃから上段用ホッパ２Ｂまで搬送される区間内において、下段層の表面に凝結材を散布して供給する凝結材散布装置を配設することにより実現できる。 The present invention is characterized in that, in the two-stage ignition sintering method, heat input to the lower layer is increased by spraying a coagulant (charcoal material) on the surface layer of the lower layer. Specifically, 2.0% by mass or more of the total amount of the coagulant compounded in the lower layer (lower raw material filling layer 10) is sprayed and supplied to the surface layer of the ignited lower layer. The coagulant rises in temperature by being sprayed on the ignited lower layer surface layer, reaches the ignition temperature, and burns. Combustion of the coagulant raises the maximum temperature reached by the surface layer of the lower layer, and increases the amount of heat supplied to the lower layer of the surface layer of the lower layer. Further, by spraying the coagulant on the downstream side of the lower igniter 1C, the width of the lower layer combustion zone 10A in the pallet traveling direction 5 is expanded. Therefore, the strength and yield of the lower layer sinter are improved. The amount of the coagulant to be sprayed and supplied to the surface layer of the lower layer is preferably less than 11.0% by mass based on the total amount of the coagulant blended in the lower layer. The basis for these settings will be described in Examples described later. For spraying the coagulant on the surface layer of the lower layer, a coagulant spraying device that sprays and supplies the coagulant on the surface of the lower layer is arranged in the section where the pallet is transported from the lower igniter 1C to the upper hopper 2B. It can be realized by setting.

ここに、散布する凝結材（炭材）の種類は問わない。散布する凝結材（炭材）は、例えば、通常焼結用に不適な揮発分を多く有する石炭も使用できる。凝結材（炭材）は点火後の下段層１０の表面に散布されるため、散布された凝結材（炭材）から発生する揮発分は、すでに生成している下段層燃焼帯１０Ａを通過する際に燃焼するため、下段層燃焼帯１０Ａの最高到達温度を上昇させたり、下段層燃焼帯１０Ａの幅を拡大させたりすることができる。また、散布された凝結材（炭材）から発生する揮発分は、上記燃焼により排ガス中に漏れることがなく、排ガスの処理工程が複雑にならないためである。
散布する凝結材の粒度は、原料中に混合される凝結材より小さいほうが好ましい。例えば、散布する凝結材には、コークス製造工程で発生する石炭であるコークスダストが好ましい。散布する凝結材の粒度が小さければ、下段用点火器１Ｃによる点火後の下段層表面からの受熱を容易とし、燃焼性が向上するためである。 Here, the type of coagulant (charcoal material) to be sprayed does not matter. As the coagulant (charcoal material) to be sprayed, for example, coal having a large amount of volatile matter, which is usually unsuitable for sintering, can also be used. Since the coagulant (charcoal material) is sprayed on the surface of the lower layer 10 after ignition, the volatile matter generated from the sprayed coagulant (charcoal material) passes through the lower layer combustion zone 10A that has already been generated. Since it burns at the time, the maximum temperature reached in the lower layer combustion zone 10A can be raised, and the width of the lower layer combustion zone 10A can be expanded. Further, the volatile matter generated from the sprayed coagulant (charcoal material) does not leak into the exhaust gas due to the above combustion, and the exhaust gas treatment process is not complicated.
The particle size of the coagulant to be sprayed is preferably smaller than that of the coagulant mixed in the raw material. For example, coke dust, which is coal generated in the coke manufacturing process, is preferable as the coagulant to be sprayed. This is because if the particle size of the coagulant to be sprayed is small, heat can be easily received from the surface of the lower layer after ignition by the lower igniter 1C, and the combustibility is improved.

図２は、本発明の一実施形態である二段点火焼結法を実施するＤＬ式焼結機１００Ｘの概要図である。ＤＬ式焼結機１００Ｘは、図１に示す従来例のＤＬ式焼結機１００と異なり、下段用点火器１Ｃのパレット進行方向下流側に配設された凝結材散布装置３０を備えている。凝結材散布装置３０は、下段用ホッパ１Ｂと上段用ホッパ２Ｂとの間に配設され、パレットが下段用点火器１Ｃから上段用ホッパ２Ｂまで搬送される区間内において、下段層の表面に凝結材を散布して供給する装置である。なお、凝結材散布装置３０は、下段用点火器１Ｃの下流側に設置する。下段用点火器１Ｃにより表面に点火された下段層に、凝結材散布装置３０による凝結材が散布されることにより、下段層燃焼帯１０Ａが拡大する。また、凝結材の散布量は、凝結材散布装置３０の切出し量によって調整される。
凝結材散布装置３０は、例えば、スリップスティックコンベア（特許第2982128号）を使用できる。コークスダストのような粒度の小さい凝結材には、投入部にフードを設けてそこに気流搬送で凝結材を吹き込む構成とすることもできる。 FIG. 2 is a schematic view of a DL type sintering machine 100X that implements the two-stage ignition sintering method according to the embodiment of the present invention. Unlike the conventional DL type sintering machine 100 shown in FIG. 1, the DL type sintering machine 100X includes a coagulant spraying device 30 arranged on the downstream side in the pallet traveling direction of the lower igniter 1C. The coagulant spraying device 30 is arranged between the lower hopper 1B and the upper hopper 2B, and condenses on the surface of the lower layer in the section where the pallet is conveyed from the lower igniter 1C to the upper hopper 2B. It is a device that sprays and supplies materials. The coagulant spraying device 30 is installed on the downstream side of the lower igniter 1C. The lower layer combustion zone 10A is expanded by spraying the coagulant by the coagulant spraying device 30 on the lower layer ignited on the surface by the lower igniter 1C. Further, the amount of the coagulant sprayed is adjusted by the amount of cutting out of the coagulant spraying device 30.
As the coagulant spraying device 30, for example, a slip stick conveyor (Patent No. 2982128) can be used. For a coagulant having a small particle size such as coke dust, a hood may be provided at the charging portion and the coagulant may be blown into the hood by air flow.

本発明の二段点火焼結法による焼結鉱の製造方法は、例えば、凝結材散布装置３０を備えたＤＬ式焼結機１００Ｘを使用して実施される。本発明の二段点火焼結法による焼結鉱の製造方法は、上述した従来例による焼結鉱の製造工程に、下段用点火器により表面が点火された下段層の表層に凝結材を散布して供給する工程を加えたものである。 The method for producing a sintered ore by the two-stage ignition sintering method of the present invention is carried out using, for example, a DL type sinter 100X equipped with a coagulant spraying device 30. In the method for producing sinter by the two-stage ignition sintering method of the present invention, a coagulant is sprayed on the surface layer of the lower layer whose surface is ignited by the lower igniter in the above-mentioned conventional method for producing sinter. The process of supplying the product is added.

本発明の一実施形態である二段点火焼結法による焼結鉱の製造方法では、下段用配合原料は、パレット内に装入されて下段層を形成する原料と、下段層表層に散布される原料とに分けられる。下段用ホッパには、下段層表層に散布される原料（一部の凝結材）を除いた下段系配合原料を供給し、下段用ホッパ内の原料（一部の凝結材を除いた下段系配合原料）を焼結パレット内に装入して、下段原料充填層を形成する。形成した下段原料充填層の表層には、凝結材散布装置により、下段層表層に散布される原料（一部の凝結材）を散布する。下段層表層に散布される原料は、下段用配合原料の全凝結材配合量のうち２．０質量％以上を含んでいる。また、下段層の表層に散布して供給する凝結材量は、下段用配合原料の全凝結材配合量のうち１１．０質量％未満とすることが好ましい。 In the method for producing a sintered ore by the two-stage ignition sintering method according to the embodiment of the present invention, the lower compounding raw material is charged into the pallet to form the lower layer and is sprayed on the lower layer surface layer. It is divided into raw materials. The lower hopper is supplied with the lower compounded raw material excluding the raw material (some coagulant) sprayed on the surface layer of the lower layer, and the lower hopper contains the raw material (excluding some coagulant). The raw material) is charged into the sintered pallet to form the lower raw material filling layer. The raw material (a part of the coagulant) to be sprayed on the surface layer of the lower layer is sprayed on the surface layer of the formed lower raw material filling layer by a coagulant spraying device. The raw material sprayed on the surface layer of the lower layer contains 2.0% by mass or more of the total amount of the coagulant compounded in the compounding raw material for the lower layer. Further, the amount of the coagulant to be sprayed and supplied to the surface layer of the lower layer is preferably less than 11.0% by mass based on the total amount of the coagulant compounded as the compounding raw material for the lower layer.

本実施形態の焼結鉱の製造方法によれば、下段用点火器１Ｃにより下段層の表面が点火され、点火された下段層表層に、凝結材散布装置３０により凝結材を散布する。凝結材の散布により、下段層表層の温度が上昇して下段層表層の焼結反応がより進行する。また、下段層表層の温度の上昇により、下方吸引される酸素含有ガスの温度も上昇し、下段層表層の下側部分の焼結反応もより進行する。また、下段層の表面の点火後に、凝結材を散布することにより、下段層燃焼帯１０Ａを拡大することができ、焼結時間を延長させることが可能となる。よって、下段層の焼結鉱の強度を改善させることができ、歩留も改善させることができる。 According to the method for producing sinter of the present embodiment, the surface of the lower layer is ignited by the lower igniter 1C, and the coagulant is sprayed on the ignited lower layer surface layer by the coagulant spraying device 30. By spraying the coagulant, the temperature of the lower layer surface layer rises, and the sintering reaction of the lower layer surface layer proceeds further. Further, as the temperature of the lower layer surface layer rises, the temperature of the oxygen-containing gas sucked downward also rises, and the sintering reaction of the lower portion of the lower layer surface layer also proceeds further. Further, by spraying the coagulant after the surface of the lower layer is ignited, the lower layer combustion zone 10A can be expanded and the sintering time can be extended. Therefore, the strength of the sinter in the lower layer can be improved, and the yield can also be improved.

なお、図２に示した焼結機の実施形態は、本発明の一例であり、上段用配合原料と下段用配合原料とを別系統で準備して、パレット上に装入する二段点火焼結法により焼結鉱を製造しているが、上段用配合原料と下段用配合原料とを一系統で準備してもよい。上段用配合原料と下段用配合原料の原料配合や組成を、同一としてもよいからである。 The embodiment of the sintering machine shown in FIG. 2 is an example of the present invention. Two-stage ignition firing in which the upper compounding material and the lower compounding material are prepared in separate systems and charged onto the pallet. Sintered ore is produced by the knotting method, but the upper compounding material and the lower compounding material may be prepared in one system. This is because the raw material composition and composition of the upper compounding raw material and the lower compounding material may be the same.

本発明の効果を実証する実施例について説明する。なお、本発明は、以下の実施例に限定されるものではない。 Examples of demonstrating the effect of the present invention will be described. The present invention is not limited to the following examples.

発明者は、ＤＬ焼結機による焼結を模擬できる焼結鍋試験（直径３００ｍｍ）により、本発明の効果を確認した。焼結鍋試験装置は、ＤＬ焼結機のようにパレットによる原料充填層の移動こそないが、所定の大きさの容器に炭材を含む配合原料を装入して、上面から着火して下方吸引により焼結を進行させる試験装置である。
後述する表２に示すように、比較例１，２と、発明例の３つの実験を行った。 The inventor confirmed the effect of the present invention by a sintering pot test (diameter 300 mm) capable of simulating sintering with a DL sintering machine. Unlike the DL sintering machine, the sintering pot tester does not move the raw material filling layer by the pallet, but the compounding raw material containing charcoal is charged into a container of a predetermined size and ignited from the upper surface to the lower side. This is a test device that advances sintering by suction.
As shown in Table 2 described later, three experiments of Comparative Examples 1 and 2 and an invention example were performed.

（原料配合）
表１は、原料とその配合割合を示す。配合原料のうち、新原料である鉄鉱石Ａ〜Ｄ、橄欖岩、石灰石、および生石灰は、表１に示す割合で配合した。表１の鉄鉱石Ａ〜Ｄは異なる産地のものを使用した。また、凝結材である炭材（粉コークス）は、新原料を１００質量％として外数で４．５質量％配合した。全試験ケースにおいて全原料の配合割合は一定である。なお、詳細は後述するが、炭材（粉コークス）については、一部の試験ケース（比較例２および発明例）においては、その一部を上段層表層または下段層表層に散布した。 (Raw material combination)
Table 1 shows the raw materials and their blending ratios. Among the blended raw materials, iron ores A to D, peridotite, limestone, and quicklime, which are new raw materials, were blended in the ratios shown in Table 1. The iron ores A to D in Table 1 used were from different origins. Further, the charcoal material (powdered coke), which is a coagulant, was blended with 4.5% by mass as an external number, with the new raw material as 100% by mass. The mixing ratio of all raw materials is constant in all test cases. Although the details will be described later, in some test cases (Comparative Example 2 and Invention Example), a part of the charcoal material (powdered coke) was sprayed on the upper layer surface layer or the lower layer surface layer.

Figure 2021120479
Figure 2021120479

（試験ケース）
以下に、試験水準を示す（表２の上段参照）。二段装入二段点火を模した比較例１，２、および発明例の３試験を行った。
比較例１（二段装入二段点火）：炭材散布なし
比較例２（二段装入二段点火）：上段層表層に炭材散布
発明例 （二段装入二段点火）：下段層表層に炭材散布 (Test case)
The test levels are shown below (see the upper part of Table 2). Three tests of Comparative Examples 1 and 2 and the invention example simulating the two-stage charging two-stage ignition were performed.
Comparative Example 1 (two-stage charging two-stage ignition): No charcoal material spraying Comparative Example 2 (two-stage charging two-stage ignition): Charcoal material spraying on the upper layer surface layer Invention example (two-stage charging two-stage ignition): Lower stage Charcoal spray on the surface layer

比較例１においては炭材散布を実施せず、全層（上段層および下段層）均一のコークス濃度とした。すなわち、全成分を全層均一とした。
比較例２においては上段層表層のみに炭材散布を実施し、発明例においては下段層表層のみに炭材散布を実施した。比較例２および発明例においては、比較例１で使用した全炭材量（新原料に対して４．５質量％の炭材量）のうちの１．２５質量％（新原料に対して０．０５６質量％）の粉コークスを上段層表層または下段層表層の散布用とし、残りの９８．７５質量％（新原料に対して４．４４４質量％）は、全層（上段層および下段層）で均一にとなるように配合した。なお、表２において、上段全コークスに示す割合とは、上段層表層散布量を上段層装入量と上段層表層散布量との和で除した値であり、下段全コークスに示す割合とは、下段層表層散布量を下段層装入量と下段層表層散布量との和で除した値である。 In Comparative Example 1, the charcoal material was not sprayed, and the coke concentration was uniform in all layers (upper layer and lower layer). That is, all the components were made uniform in all layers.
In Comparative Example 2, the charcoal material was sprayed only on the upper surface layer, and in the invention example, the charcoal material was sprayed only on the lower layer surface layer. In Comparative Example 2 and Invention Example, 1.25% by mass (0 with respect to the new raw material) of the total amount of carbonaceous material (4.5% by mass with respect to the new raw material) used in Comparative Example 1. .056% by mass) of powdered coke was used for spraying the upper layer surface layer or the lower layer surface layer, and the remaining 98.75% by mass (4.44% by mass with respect to the new raw material) was the entire layer (upper layer and lower layer). ) To make it uniform. In Table 2, the ratio shown in all the upper coke is the value obtained by dividing the amount of the upper layer surface layer sprayed by the sum of the upper layer charge amount and the upper layer surface layer spray amount, and the ratio shown in the lower layer total coke is , The value obtained by dividing the amount of the lower layer surface layer sprayed by the sum of the lower layer charge amount and the lower layer surface layer spray amount.

また、原料充填層（上段層および下段層）を形成する原料としての炭材は、いずれも粒度が−５ｍｍ（５ｍｍ未満）のもの（５ｍｍの篩目の篩下のもの）を使用し、散布用の炭材は−０．２５ｍｍ（０．２５ｍｍ未満）のもの（０．２５ｍｍの篩目の篩下のもの）を使用した。 In addition, as the raw material for forming the raw material filling layer (upper layer and lower layer), the carbonaceous material having a particle size of -5 mm (less than 5 mm) (under a sieve of 5 mm mesh) is used and sprayed. The carbonaceous material used was −0.25 mm (less than 0.25 mm) (under a 0.25 mm sieve).

Figure 2021120479
Figure 2021120479

（造粒方法）
比較例１に使用する原料（上段層装入用および下段層装入用）と、比較例２および発明例に使用する原料（上段層装入用および下段層装入用）を、それぞれ一括して造粒した。造粒は、試験用ドラムミキサー（直径６００ｍｍ、回転数２５ｒｐｍ）で４分間混合後、配合原料に対して６．５質量％の水分を添加し、さらに４分間処理した。 (Granulation method)
The raw materials used in Comparative Example 1 (for upper layer charging and lower layer charging) and the raw materials used in Comparative Example 2 and Invention Examples (for upper layer charging and lower layer charging) are collectively combined. Granulated. Granulation was carried out by mixing with a test drum mixer (diameter 600 mm, rotation speed 25 rpm) for 4 minutes, adding 6.5% by mass of water to the compounding raw material, and further treating for 4 minutes.

（装入・点火方法）
鍋は、高さ５００ｍｍの円柱形の下段用鍋（φ３００ｍｍ）と、高さ３００ｍｍの円柱形の上段用鍋（φ３００ｍｍ）の２本を準備した。まず、下段用鍋および上段用鍋に造粒した原料を装入して、下段層の層高を５００ｍｍ、上段層の層高を３００ｍｍとした。そして、層高５００ｍｍの下段用鍋をセットして、下段層の表面に１分間点火した。その後、下段用鍋の上に、層高３００ｍｍの上段用鍋をセットして、下段層の下面から２７０ｍｍ位置の温度上昇確認後（上下二段での焼結の進行を確認後）に、上段層の表面に１分間点火した。吸引圧は、点火開始から１５００ｍｍＡｑ（１４．７ｋPa）一定とした。炭材は、下段層または上段層の点火完了直後から１分間散布した。 (Charging / ignition method)
Two pots were prepared, a cylindrical lower pot (φ300 mm) having a height of 500 mm and a cylindrical upper pot (φ300 mm) having a height of 300 mm. First, the granulated raw materials were charged into the lower pot and the upper pot, and the layer height of the lower layer was set to 500 mm and the layer height of the upper layer was set to 300 mm. Then, a lower pot having a layer height of 500 mm was set, and the surface of the lower layer was ignited for 1 minute. After that, set the upper pot with a layer height of 300 mm on the lower pot, and after confirming the temperature rise at the position 270 mm from the lower surface of the lower layer (after confirming the progress of sintering in the upper and lower two stages), the upper stage. The surface of the layer was ignited for 1 minute. The suction pressure was constant at 1500 mmAq (14.7 kPa) from the start of ignition. The charcoal material was sprayed for 1 minute immediately after the ignition of the lower layer or the upper layer was completed.

（焼結時間）
焼結時間は以下のように測定した。熱電対を下段用鍋の下面から４４０ｍｍ、３５０ｍｍ、２００ｍｍ、風箱の位置にそれぞれ挿入し、層内温度を測定した。風箱は焼結鍋直下にあり排ガスが通過する場所であり、ここに装入した熱電対により排ガスの温度を測定した。上段層の焼結完了と下段層の焼結完了の遅い方を、原料充填層全体（上段層および下段層）としての焼結完了とみなすため、４４０ｍｍ位置の熱電対の２回目のピーク時刻（上段層の焼結完了）までの所要時間と、風箱位置の熱電対の１回目のピーク時刻（下段層の焼結完了）までの所要時間の２つのうち長い方を、原料充填層全体の焼結時間とした。焼結完了となった時刻から３分後に吸引を停止し、焼結終了とした。 (Sintering time)
The sintering time was measured as follows. The thermocouple was inserted at 440 mm, 350 mm, 200 mm and the position of the air box from the lower surface of the lower pot, respectively, and the temperature inside the layer was measured. The air box is located directly under the sintering pot and is the place where the exhaust gas passes, and the temperature of the exhaust gas was measured by the thermocouple charged in this place. Since the later of the completion of sintering of the upper layer and the completion of sintering of the lower layer is regarded as the completion of sintering of the entire raw material filling layer (upper layer and lower layer), the second peak time of the thermocouple at the 440 mm position ( The longer of the time required to complete the sintering of the upper layer and the time required to complete the sintering of the lower layer at the first peak time of the thermocouple at the airbox position is the longer of the entire raw material filling layer. The sintering time was used. Suction was stopped 3 minutes after the time when the sintering was completed, and the sintering was completed.

（焼結鉱強度）
焼結鉱強度は、ＪＩＳ Ｍ８７１２(２００９)に基づいて、冷間強度（回転強度指数ＴＩ）を測定した。ただし、供試試料の質量は１５ｋｇとした。なお、強度測定においては、上段焼結鉱の回収サンプル重量が少ないため、下段焼結鉱（下段用鍋内の焼結鉱）のみ測定をおこなった。 (Sinter strength)
For the sinter strength, the cold strength (rotational strength index TI) was measured based on JIS M8712 (2009). However, the mass of the test sample was 15 kg. In the strength measurement, since the recovered sample weight of the upper sinter was small, only the lower sinter (sinter in the lower pot) was measured.

（生産率）
生産率は、上述のように測定した焼結時間に基づいて、以下の式（５）により求めた。
生産率＝成品量(ｔ)/焼結面積(０．０７ｍ２)/焼結時間(日) ・・・（５）
なお、成品量は、焼結後、得られた焼結ケーキを、２ｍの高さから４回落下処理を行い、粒径＋５ｍｍ（５ｍｍ超）を焼結成品として重量を求めた。 (Productivity rate)
The production rate was determined by the following formula (5) based on the sintering time measured as described above.
Production rate = product quantity (t) / sintering area (0.07m 2 ) / sintering time (day) ・ ・ ・ (5)
As for the amount of the product, after sintering, the obtained sintered cake was dropped from a height of 2 m four times, and the weight was determined with the particle size + 5 mm (more than 5 mm) as the sintered product.

（試験結果）
表２の下段に、試験結果を示す。
全体（上段層および下段層）での歩留は、上段層のみに炭材を散布した比較例２においては、比較例１よりも下段層焼結鉱の強度および歩留が低下した。また、生産率も低下した。下段層のみに炭材を散布した発明例においては、生産率を維持しつつ、比較例１よりも下段層焼結鉱の強度および歩留がともに改善した。 (Test results)
The test results are shown in the lower part of Table 2.
As for the yield of the whole (upper layer and lower layer), in Comparative Example 2 in which the carbonaceous material was sprayed only on the upper layer, the strength and yield of the lower layer sinter were lower than those in Comparative Example 1. The production rate has also declined. In the invention example in which the carbonaceous material was sprayed only on the lower layer, the strength and yield of the lower layer sinter were improved as compared with Comparative Example 1 while maintaining the productivity.

上段層の歩留は、比較例１に対して比較例２が低く、発明例ではさらに低い値となった。比較例２については、上段層表層の炭材散布により上段層表層近傍の歩留は改善し、上段層表層近傍よりも下側部分においては、原料に配合するコークス割合が少ないため歩留が低下したと想定される。表層での歩留改善よりも、下側部分での歩留低下の影響の方が大きかったため、比較例１よりも、上段層の歩留が低下したものと考えられる。また、発明例については、比較例２で得られたと考えられる、上段層表層近傍での歩留改善効果も得られないため、上段層の歩留が、比較例２よりも低くなったと考えられる。 The yield of the upper layer was lower in Comparative Example 2 than in Comparative Example 1, and even lower in the invention example. In Comparative Example 2, the yield near the surface layer of the upper layer was improved by spraying the charcoal material on the surface layer of the upper layer, and the yield decreased in the lower part than the vicinity of the surface layer of the upper layer because the proportion of coke mixed in the raw material was small. It is assumed that it was done. Since the effect of the yield decrease in the lower portion was greater than the yield improvement in the surface layer, it is considered that the yield in the upper layer was decreased as compared with Comparative Example 1. Further, with respect to the invention example, it is considered that the yield of the upper layer was lower than that of Comparative Example 2 because the effect of improving the yield in the vicinity of the surface layer of the upper layer, which was considered to have been obtained in Comparative Example 2, could not be obtained. ..

下段層の歩留は、比較例１に対して比較例２が低く、発明例では比較例１よりも改善している。比較例２については、原料に配合するコークス割合が少ないため、比較例１よりも歩留が低下したと想定される。発明例では、下段層表層の炭材散布により下段層表層の最高到達温度が上昇し、近傍の歩留が改善したことが想定される。また、下段層表層の到達温度の上昇は、下方吸引によりその下側部分の熱の供給量を増すことになる。表２に示すように、発明例では、二段点火焼成中の２００mm位置における最高到達温度が比較例１および比較例２よりも高く、下段層の焼結鉱強度が改善したことが下段層の大きな歩留改善効果の発現要因であると考えられる。下段層においては、原料に配合するコークス割合を減らしたことによる歩留の低下要素はあるものの、二段点火中の下段層では酸素供給量がそもそも少ないため、原料へのコークス配合割合を減らしたとしても、到達温度の低下への影響は比較的小さいと考えられる。一方、炭材散布による熱供給量の増加による効果が表層近傍を超えて得られた結果、下段層では大きな歩留改善効果が発現したと考えられる。 The yield of the lower layer is lower in Comparative Example 2 than in Comparative Example 1, and is improved in Comparative Example 1 as compared with Comparative Example 1. In Comparative Example 2, since the proportion of coke blended in the raw material is small, it is assumed that the yield is lower than that in Comparative Example 1. In the example of the invention, it is assumed that the maximum temperature reached on the surface layer of the lower layer is raised by spraying the carbonaceous material on the surface layer of the lower layer, and the yield in the vicinity is improved. Further, the increase in the temperature reached at the surface layer of the lower layer increases the amount of heat supplied to the lower portion due to the downward suction. As shown in Table 2, in the examples of the invention, the maximum temperature reached at the 200 mm position during the two-stage ignition firing was higher than that of Comparative Example 1 and Comparative Example 2, and the sinter strength of the lower layer was improved. It is considered to be a factor that causes a large yield improvement effect. In the lower layer, although there is a factor of lowering the yield due to the reduction of the coke content in the raw material, the oxygen supply amount in the lower layer during the two-stage ignition is small in the first place, so the coke content in the raw material was reduced. Even so, the effect on the decrease in the ultimate temperature is considered to be relatively small. On the other hand, as a result of the effect of increasing the heat supply amount by spraying the carbonaceous material being obtained beyond the vicinity of the surface layer, it is considered that a large yield improvement effect was exhibited in the lower layer.

なお、発明例同様、二段装入二段点火を模し下段層表層散布のみを行った条件において、下段層表層に散布する炭材散布量の割合を、２．０％から段階的に増加させた実験も実施した。その結果、下段全コークスに対して、下段層表層に散布する炭材散布量の割合が１１．０％を超える試験において、下段層の強度・歩留の改善が飽和した。よって、この試験結果に基づいて、下段層表層に散布する炭材散布量の割合の上限値として、１１．０％未満という値を設定した。 As in the case of the invention, the proportion of the amount of carbonaceous material sprayed on the surface layer of the lower layer is gradually increased from 2.0% under the condition that only the surface layer of the lower layer is sprayed in imitation of the two-stage charging and two-stage ignition. The experiment was also carried out. As a result, in the test in which the ratio of the amount of carbonaceous material sprayed on the surface layer of the lower layer to all the coke in the lower layer exceeded 11.0%, the improvement in the strength and yield of the lower layer was saturated. Therefore, based on this test result, a value of less than 11.0% was set as the upper limit of the ratio of the amount of carbonaceous material sprayed on the surface layer of the lower layer.

１００…焼結機、１Ａ…下段用ドラムミキサー、１Ｂ…下段用ホッパ、１Ｃ…下段用点火器、１Ｄ…下段用原料槽群（下段原料槽１Ｄ１〜１ＤＸ）、２Ａ…上段用ドラムミキサー、２Ｂ…上段用ホッパ、２Ｃ…上段用点火器、２Ｄ…上段用原料槽群（上段原料槽２Ｄ１〜２ＤＸ）、３…焼結部、５…パレット進行方向、６…下方吸引、１０…下段層、１０Ａ…下段層燃焼帯、２０…上段層、２０Ａ…上段層燃焼帯、３０…凝結材散布装置 100 ... sintering machine, 1A ... lower drum mixer, 1B ... lower hoppers, 1C ... lower stage igniter, 1D ... lower raw material tank group (the lower raw material tank 1D 1 ~1D X), 2A ... upper drum mixer , 2B ... upper hoppers, 2C ... upper ignition device, 2D ... upper raw material tank group (the upper feed tank 2D 1 ~2D X), 3 ... sintered part, 5 ... pallet advancing direction, 6 ... lower suction, 10 ... Lower layer, 10A ... Lower layer combustion zone, 20 ... Upper layer, 20A ... Upper layer combustion zone, 30 ... Coagulant spraying device

Claims (3)

焼結機内に、凝結材を含む焼結鉱の原料を装入する際に、層高方向において二段となるように装入して、下段原料充填層および上段原料充填層を形成する工程と、
前記下段原料充填層および前記上段原料充填層を、下段用点火器および上段用点火器により、それぞれ点火するとともに、前記下段原料充填層の下方から酸素含有ガスを吸引する工程とを含み、
前記下段原料充填層における全凝結材配合量のうち２．０質量％以上を、前記下段用点火器により点火された前記下段原料充填層の表層に散布して供給する、
ことを特徴とする焼結鉱の製造方法。 When the raw material of the sinter containing the coagulant is charged into the sintering machine, it is charged in two stages in the layer height direction to form the lower raw material filling layer and the upper raw material filling layer. ,
The lower raw material filling layer and the upper raw material filling layer are ignited by the lower igniter and the upper igniter, respectively, and the step of sucking oxygen-containing gas from below the lower raw material filling layer is included.
2.0% by mass or more of the total amount of the coagulant compounded in the lower raw material filling layer is sprayed and supplied to the surface layer of the lower raw material filling layer ignited by the lower igniter.
A method for producing a sinter, which is characterized in that. 前記下段原料充填層の表層に散布して供給する凝結材量は、前記下段原料充填層における全凝結材配合量のうち１１．０質量％未満とする、
ことを特徴とする請求項１に記載の焼結鉱の製造方法。 The amount of the coagulant to be sprayed and supplied to the surface layer of the lower raw material filling layer shall be less than 11.0% by mass of the total amount of the coagulant blended in the lower raw material filling layer.
The method for producing a sinter according to claim 1. 循環移動する複数の焼結パレットと、
前記焼結パレット内に、一部の凝結材を除いた下段系配合原料を装入して下段原料充填層を形成する下段用ホッパと、
前記下段原料充填層上に上段系配合原料を装入して上段原料充填層を形成する上段用ホッパと、
前記下段原料充填層の表面および前記上段原料充填層の表面にそれぞれ点火する下段用点火器および上段用点火器と、
前記下段原料充填層中および前記上段原料充填層中の酸素含有ガスを下方に吸引する下方吸引装置と、を備えた下方吸引式の焼結機であって、
前記焼結パレットが前記下段用点火器から前記上段用ホッパまで搬送される区間内において、前記下段原料充填層の表層に、前記一部の凝結材を散布して供給する凝結材散布装置が配設されている、
ことを特徴とする焼結機。 Multiple sintered pallets that move in circulation and
A lower hopper for forming a lower raw material filling layer by charging a lower compound raw material excluding a part of the coagulant into the sintered pallet.
An upper hopper for forming an upper raw material filling layer by charging an upper mixed raw material onto the lower raw material filling layer.
A lower igniter and an upper igniter that ignite the surface of the lower raw material filling layer and the surface of the upper raw material filling layer, respectively.
A lower suction type sintering machine provided with a lower suction device for sucking oxygen-containing gas in the lower raw material filling layer and the upper raw material filling layer downward.
Within the section where the sintered pallet is transported from the lower igniter to the upper hopper, a coagulant spraying device for spraying and supplying a part of the coagulant to the surface layer of the lower raw material filling layer is arranged. It is set up
A sintering machine characterized by that.
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