JPH0561332B2 - - Google Patents
Info
- Publication number
- JPH0561332B2 JPH0561332B2 JP19201988A JP19201988A JPH0561332B2 JP H0561332 B2 JPH0561332 B2 JP H0561332B2 JP 19201988 A JP19201988 A JP 19201988A JP 19201988 A JP19201988 A JP 19201988A JP H0561332 B2 JPH0561332 B2 JP H0561332B2
- Authority
- JP
- Japan
- Prior art keywords
- ore
- blast furnace
- lump
- pile
- sticky
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 9
- 238000011068 loading method Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 238000002156 mixing Methods 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
〔産業上の利用分野〕
本発明は、高炉装入用原料のヤード積付方法に
関し、さらに詳しくは、高炉で使用する塊鉄鉱石
の中での粘着塊鉱石の付着粉鉱を効率的に除去す
る原料ヤードの積付方法に関する。
〔従来の技術〕
高炉で使用する塊鉱石は、鉄鉱石の種別単位に
使用する単味鉱と、数種類の鉄鉱石をヤードでパ
イル状に造成、ブレンドして使用するブレンド鉱
（通称、均鉱またはオアベツト鉱という）に分類
される。
ブレンド鉱（以下、均鉱という）は、粘着塊鉱
石、低品位塊鉱石などの単味鉱として不適な鉄鉱
石を含めた数種類を配合し、均一成分の塊鉱石と
して使用する。ここに、粘着塊鉱石とは塊鉱石に
湿つた粉鉱が付着したものを云う。均鉱パイル
は、数種類の鉄鉱石の配合により、目標とする成
分に調整される。さらに配合された鉄鉱石は、そ
の量により１〜数分割され、異種銘柄を重ね合わ
せて造成される。
造成に際しては、要求粒度および粉の混入を防
止するため、破砕、篩分を繰り返し行われる。
すなわち、第６図に示すように、大塊が混入す
る粗鉱１は、破砕機２、篩分機３を経由し、要求
粒度に整粒、篩分されパイル状に積付ける。
また、山元整粒鉱１ａおよび精鉱塊４は篩分機
３，５を経由し、粉の混入防止および付着粉を除
去し、パイル状に積付を行う。
さらに各種の塊鉄鉱石を多層に積上げ造成され
た均鉱パイル６の払出しには、均鉱パイル６の断
面をブレンドしながら、切り出すためのハローお
よびハロー棒１０、横行ホイルバケツト１１の設
置されたブレンデイングリクレーマ７で払出す。
このように均鉱断面方向にブレンドされながら
切り出された均鉱は、篩分機８で最終の篩分けを
行い、付着粉、混入粉を除去し、貯鉱槽９に装入
され、高炉に供給される。
〔発明が解決しようとする課題〕
この均鉱に粘着塊鉱石を使用した場合、従来の
高炉貯鉱槽装入直前の篩分のみでは付着粉鉱を十
分に除去できない。また降雨時にはダンゴ状にな
り、さらに付着粉鉱の除去が悪化する。
従来の、高炉への原料装入工程の中で、付着粉
の多い、ゴア鉱、カパネマ鉱などが20％以上配合
された場合、篩分が十分に行われず、高炉内に粉
鉱が大量に装入されることとなり、ダスト量の増
加、通気抵抗の変動等により高炉操業に重大な影
響を与えることになる。
従つて、粘着塊鉱石の使用は高炉に粉鉱が混入
するためにその配合量にも制限があつた。
本発明は、これら上述の問題を解決するために
提案されたものであり、粘着塊鉱石中の付着微粉
を効率的に除去するための高炉装入用原料のヤー
ド積付方法を提供することを課題とするものであ
る。
〔課題を解決するための手段〕
本発明者らは水分の少ない（水分含有率0.2％
以下）−５mm粒径の粉鉱石層を粘着塊鉱石層（水
分含有率２〜３％）に隣接して層状に積付け、粉
鉱石を粘着塊鉱石表面に付着させて、粉鉱の掻落
し効果をあげることに着目し、この付着鉱として
焼結返鉱（−５mm粒度）を均鉱に配合し、粘着塊
鉱石に抱き合いで積付を行うことを想着した。
本発明は、上述の問題点を解決するもので、粘
着塊鉱石を配合した高炉装入用原料のヤード積付
方法に適用され、次の方法をと採つた。すなわ
ち、
粘着塊鉱石層と−５mm粒径の乾粉鉱石層を隣接
して層状に積付ける方法である。ここに、隣接し
て積付けるとは、両者を層状に積付ける或は両者
をフイーダーで定量切出しベルトコンベア上で混
合することを云う。
〔作用〕
本発明は、粘着塊鉱石の表面に、水分の少ない
−５mm粒径の乾粉鉱石（焼結返鉱）を層状に積付
けて付着させるので、粘着塊鉱石の表面に付着し
ている湿つた粉鉱と乾粉鉱石（焼結返鉱）が結合
し、これを篩分けすることにより粉鉱を効率よく
除去することが可能となる。
〔実施例〕
第１図は本発明の一実施例の説明図であり、粘
着塊鉱石の上に−５mm粒径の焼結返鉱を隣接させ
て層状に積付けた場合を示している。第１表に示
すような粘着塊鉱石を２銘柄（配合比50％）配合
した鉱石パイルの場合、従来例の積付方法で積付
した鉱石パイルと、焼結返鉱を20％配合した本発
明方法で積付した鉱石パイルについて、高炉装入
直前篩の篩上中の−５mm粒度（−５mm混入率）を
比較して見ると、第３表および第４図に示すよう
に、−５mm粒度は何れの高炉においても本発明方
法の方が低下した。
さらに第２表に示すように、粘着塊鉱石を２銘
柄（配合比22％）配合した鉱石パイルについて
も、従来例の積付方法で積付した鉱石パイルと、
焼結返鉱を20％配合した本発明方法で積付した鉱
石パイルについて、高炉装入直前篩の篩上中の−
５mm粒度（−５mm混入率）を比較して見ると、第
４表および第５図に示すように、やはり、粘着塊
鉱石を２銘柄（配合比50％）配合した鉱石パイル
の場合と同様に、本発明方法の方が低下した。な
お、第４図および第５図はそれぞれ第３表および
第４表をグラフで表示したものである。
[Industrial Application Field] The present invention relates to a yard loading method for raw materials for blast furnace charging, and more specifically, to a method for efficiently removing adhering fine ore from sticky lump ore in lump iron ore used in a blast furnace. This article relates to a method of loading materials in a raw material yard. [Conventional technology] The lump ore used in blast furnaces is simple ore used for each type of iron ore, and blend ore (commonly known as level ore), which is used by creating piles of several types of iron ore in a yard and blending them. It is classified as orabetsuite). Blended ore (hereinafter referred to as uniform ore) is a mixture of several types of iron ore, such as sticky lump ore and low-grade lump ore, which are unsuitable as simple ore, and is used as a lump ore with a uniform composition. Here, sticky lump ore refers to lump ore with wet ore adhered to it. The leveled ore pile is adjusted to the target composition by mixing several types of iron ore. Furthermore, the blended iron ore is divided into one to several parts depending on the amount, and different types of iron ore are piled up to create it. During production, crushing and sieving are repeated in order to maintain the required particle size and prevent powder from being mixed in. That is, as shown in FIG. 6, coarse ore 1 mixed with large lumps passes through a crusher 2 and a sieve 3, is sized and sieved to a required particle size, and is stacked in a pile. Further, the Yamamoto sized ore 1a and the concentrate lump 4 are passed through sieves 3 and 5 to prevent powder from being mixed in and to remove adhering powder, and then stacked in a pile. Furthermore, in order to unload the leveled ore pile 6 created by piling up various lump iron ores in multiple layers, a harrow, a harrow rod 10, and a transverse foil bucket 11 are installed to cut out the leveled ore pile 6 while blending the cross section of the leveled ore pile 6. Dispense with Daing Reclaimer 7. The leveled ore cut out while being blended in the cross-sectional direction of the leveled ore is subjected to a final sieving in a sieving machine 8 to remove adhering powder and mixed powder, and is charged into an ore storage tank 9 and supplied to a blast furnace. be done. [Problems to be Solved by the Invention] When sticky lump ore is used as the leveled ore, the adhering fine ore cannot be sufficiently removed by the conventional sieve just before charging into the blast furnace ore storage tank. In addition, when it rains, it becomes lump-like and the removal of adhering fine ore becomes worse. In the conventional raw material charging process to the blast furnace, if 20% or more of Gore ore, Capanema ore, etc., which has a lot of adhering powder, is mixed, sieving is not done enough and a large amount of fine ore is left in the blast furnace. This will have a significant impact on blast furnace operations due to increased dust amount, fluctuations in ventilation resistance, etc. Therefore, the use of sticky lump ore has been limited in its blending amount because fine ore is mixed into the blast furnace. The present invention was proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a yard loading method for raw materials for blast furnace charging to efficiently remove adhering fine powder from sticky lump ore. This is a subject to be addressed. [Means for Solving the Problems] The present inventors have developed a method with low moisture content (moisture content of 0.2%).
Below) - A layer of fine ore with a grain size of 5 mm is stacked in a layer adjacent to a layer of sticky lump ore (moisture content 2-3%), and the fine ore is attached to the surface of the sticky lump ore, and the fine ore is scraped off. Focusing on improving the effect, we came up with the idea of adding sintered return ore (-5mm grain size) to the leveled ore as a cohesive ore, and stacking it together with the cohesive lump ore. The present invention solves the above-mentioned problems and is applied to a yard loading method for raw material for blast furnace charging containing sticky lump ore, and employs the following method. That is, this is a method in which a layer of sticky lump ore and a layer of dry powder ore with a grain size of -5 mm are stacked adjacent to each other in a layered manner. Here, stacking adjacently means stacking both in layers or cutting out a fixed amount of both using a feeder and mixing them on a belt conveyor. [Function] In the present invention, dry powder ore (sintered return ore) with a grain size of -5 mm, which has little moisture, is stacked and adhered to the surface of the sticky lump ore in a layered manner. Wet powder ore and dry powder ore (sintered return ore) are combined, and by sieving this, it becomes possible to efficiently remove the powder ore. [Example] Fig. 1 is an explanatory diagram of an example of the present invention, and shows a case in which sintered return ore with a grain size of -5 mm is stacked in a layered manner on top of a cohesive lump ore. In the case of an ore pile containing two brands of sticky lump ore (mixing ratio 50%) as shown in Table 1, an ore pile loaded using the conventional loading method and a pile containing 20% sintered return ore. Comparing the -5 mm particle size (-5 mm inclusion rate) on the sieve immediately before charging into the blast furnace for the ore piles loaded by the invention method, as shown in Table 3 and Figure 4, -5 mm The particle size was reduced by the method of the present invention in both blast furnaces. Furthermore, as shown in Table 2, an ore pile containing two brands of sticky lump ore (mixing ratio 22%) is different from an ore pile loaded using the conventional loading method.
Regarding the ore pile loaded by the method of the present invention containing 20% sintered return ore, -
Comparing the 5mm particle size (-5mm mixing rate), as shown in Table 4 and Figure 5, the results are similar to those of the ore pile containing two brands of sticky lump ore (mixing ratio 50%). , the method of the present invention was lower. Note that FIGS. 4 and 5 are graphical representations of Tables 3 and 4, respectively.
【表】【table】
【表】【table】
【表】【table】
本発明は、粘着塊鉱石に付着している粉鉱を効
率的に除去することが可能となり、高炉装入用原
料の配合比の制限が緩和できるので高炉操業の効
率化に優れた効果を奏する。
The present invention makes it possible to efficiently remove fine ore adhering to sticky lump ore, and eases restrictions on the blending ratio of raw materials for blast furnace charging, which has an excellent effect on improving the efficiency of blast furnace operation. .
第１図〜第３図は本発明の実施例の説明図、第
４図および第５図は本発明と従来例の比較グラ
フ、第６図は一般の高炉装入原料の積付け説明図
である。
１……粗鉱、１ａ……山元整粒鉱、６……均鉱
パイル、２０……粘着塊鉱石、３０……焼結返
鉱。
Figures 1 to 3 are explanatory diagrams of embodiments of the present invention, Figures 4 and 5 are comparison graphs of the present invention and conventional examples, and Figure 6 is an explanatory diagram of stowage of general blast furnace charging raw materials. be. 1... Coarse ore, 1a... Yamamoto sized ore, 6... Leveled ore pile, 20... Sticky lump ore, 30... Sintered return ore.
Claims (1)
ド積付方法において、 粘着塊鉱石層と−５mm粒径の乾粉鉱石層を隣接
して層状に積付けることを特徴とする高炉装入用
原料のヤード積付方法。[Scope of Claims] 1. A yard stacking method for raw material for blast furnace charging containing sticky lump ore, characterized by stacking a layer of sticky lump ore and a layer of dry powder ore with a grain size of -5 mm adjacent to each other in a layered manner. A yard loading method for raw materials for blast furnace charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19201988A JPH0243327A (en) | 1988-08-02 | 1988-08-02 | Method for yard stacking of raw material for charging to blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19201988A JPH0243327A (en) | 1988-08-02 | 1988-08-02 | Method for yard stacking of raw material for charging to blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0243327A JPH0243327A (en) | 1990-02-13 |
| JPH0561332B2 true JPH0561332B2 (en) | 1993-09-06 |
Family
ID=16284245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19201988A Granted JPH0243327A (en) | 1988-08-02 | 1988-08-02 | Method for yard stacking of raw material for charging to blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0243327A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5375710B2 (en) * | 2010-03-30 | 2013-12-25 | 新日鐵住金株式会社 | Method of loading ore ore |
-
1988
- 1988-08-02 JP JP19201988A patent/JPH0243327A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0243327A (en) | 1990-02-13 |
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