JPH01104723A - Production of sintering raw material from iron making dust - Google Patents
Production of sintering raw material from iron making dustInfo
- Publication number
- JPH01104723A JPH01104723A JP26042687A JP26042687A JPH01104723A JP H01104723 A JPH01104723 A JP H01104723A JP 26042687 A JP26042687 A JP 26042687A JP 26042687 A JP26042687 A JP 26042687A JP H01104723 A JPH01104723 A JP H01104723A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- mixer
- dust
- sintering raw
- moisture
- 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.)
- Pending
Links
- 239000002994 raw material Substances 0.000 title claims abstract description 48
- 239000000428 dust Substances 0.000 title claims abstract description 39
- 238000005245 sintering Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title 2
- 229910052742 iron Inorganic materials 0.000 title 1
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 238000005469 granulation Methods 0.000 claims description 9
- 230000003179 granulation Effects 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 238000007908 dry granulation Methods 0.000 claims description 4
- 239000002562 thickening agent Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 238000005453 pelletization Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は製鉄ダストからの焼結原料製造方法に係り、特
に操業が安定しすぐれた焼結塊が得られる焼結原料の製
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a sintered raw material from iron-making dust, and more particularly to a method for producing a sintered raw material that is stable in operation and provides excellent sintered lumps.
製鉄所において、高炉および転炉等から発生するダスト
は回収されて焼結原料となり焼結炉を経て再び高炉に装
入される。従来の製鉄ダストからの焼結原料の製造方法
を第３図により説明する。In a steelworks, dust generated from blast furnaces, converters, etc. is collected and used as a sintering raw material, which is then charged into the blast furnace via the sintering furnace. A conventional method for producing a sintering raw material from ironmaking dust will be explained with reference to FIG.
高炉および転炉で発生し湿式回収された湿ダスト２は、
スラリー状でシックナー４に入り、濃縮されて圧入ポン
プ６でフィルター８に供給され脱水後、コンベアー１０
でミキサー１２に供給される。Wet dust 2 generated in blast furnaces and converters and collected in a wet manner is
It enters the thickener 4 in the form of slurry, is concentrated, is supplied to the filter 8 by the pressure pump 6, and after dehydration is conveyed to the conveyor 10.
and is supplied to the mixer 12.
一方、集塵機で捕集された乾ダスト１４はタンクローリ
−１６で運搬され槽１８に投入され、コンベアー２０で
ミキサー１２に供給される。ミキサー１２で混合された
後、コンベアー２２でロータリードライヤー２４に供給
され、乾燥造粒後コンベアー２６で焼結原料として運搬
されろ。On the other hand, the dry dust 14 collected by the dust collector is transported by a tank truck 16 and put into a tank 18, and then supplied to the mixer 12 by a conveyor 20. After being mixed in the mixer 12, they are supplied to a rotary dryer 24 by a conveyor 22, and after being dried and granulated, they are transported by a conveyor 26 as a sintering raw material.
水分が２２％以上の湿ダスト２および水分が０％の乾ダ
スト１４は各工場の生産状況によって発生量が変化する
ため、ロータリードライヤー２４の装入物の入口水分は
変化する。また、乾ダスト１４は他の用途に使用される
こともある。従来、このように湿ダスト２と乾ダスト１
４の量の変化による水分の変動に対して特に調整は行わ
れていなかった。このため、乾ダスト１４の量が減り水
分が過剰になるとロータリードライヤー２４の入口付近
に焼結原料が付着成長して、遂に詰って運転不能になる
ことがあったり、また、塊の割合が増大し焼結原料とし
て不適となることもあった。一方、乾ダスト１４が多く
なり過ぎると水分が不足しロータリードライヤー２４に
おいて粒子状になり難く、また粒子化できたとしても強
度が弱く焼結材料としては不適であった。従って従来、
湿ダスト２および乾ダスト１４の量により水分が変動し
、安定した焼結原料の製造が困難であった。The amount of wet dust 2 with a moisture content of 22% or more and the dry dust 14 with a moisture content of 0% varies depending on the production status of each factory, so the moisture content at the inlet of the charge to the rotary dryer 24 varies. Moreover, the dry dust 14 may be used for other purposes. Conventionally, wet dust 2 and dry dust 1 were
No particular adjustments were made to the fluctuations in moisture content due to changes in the amount of 4. For this reason, when the amount of dry dust 14 decreases and moisture becomes excessive, sintering raw materials may adhere and grow near the inlet of the rotary dryer 24, which may eventually become clogged and inoperable, or the proportion of lumps may increase. In some cases, it was unsuitable as a raw material for sintering. On the other hand, if there is too much dry dust 14, there will be a lack of moisture and it will be difficult to form particles in the rotary dryer 24, and even if particles can be formed, the strength will be too low and it will not be suitable as a sintered material. Therefore, conventionally,
The moisture content varied depending on the amount of wet dust 2 and dry dust 14, making it difficult to produce a stable sintering raw material.
本発明の目的は上記従来技術の問題点を解決し、好適な
焼結材料を安定して製造できる製鉄ダストからの焼結原
料製造方法を提供するにある。An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for producing a sintering raw material from iron-making dust that can stably produce a suitable sintered material.
〔問題点を解決するための手段および作用〕本発明の要
旨とするところは次の如くである。[Means and operations for solving the problems] The gist of the present invention is as follows.
すなわち、製鉄所で発生する湿ダストおよび乾ダストを
ミキサーにて混合しロータリードライヤーで乾燥造粒す
る焼結原料の製造方法において、前記ミキサーにおける
焼結原料の水分が１６〜２０％になる如く湿ダストおよ
び乾ダストの装入量を調整し、調整に必要な乾ダストの
量が不足する場合には前記乾燥造粒後の焼結原料の一部
をミキサーに返送する段階と、前記ロータリードライヤ
ーによる乾燥造粒後の焼結原料の水分が１０〜１４％に
なる如くロータリードライヤーのバーナーの燃焼を制御
する段階と、前記ロータリードライヤーにおける乾燥造
粒後の焼結原料を篩分けし篩上に残った焼結原料を破砕
して前記ミキサーに返送する段階と、を有して成ること
を特徴とする製鉄ダストからの焼結原料製造方法である
。That is, in a method for producing a sintered raw material in which wet dust and dry dust generated in a steel mill are mixed in a mixer and dried and granulated in a rotary dryer, the moisture content of the sintered raw material in the mixer is adjusted to 16 to 20%. A step of adjusting the charging amount of dust and dry dust, and returning a part of the sintered raw material after dry granulation to the mixer if the amount of dry dust necessary for adjustment is insufficient, and A step of controlling the combustion of the burner of the rotary dryer so that the moisture content of the sintered raw material after drying and granulation is 10 to 14%, and a step of sieving the sintered raw material after drying and granulation in the rotary dryer and leaving it on the sieve. A method for producing a sintering raw material from iron-making dust, characterized by comprising the step of crushing the sintered raw material and returning it to the mixer.
本発明の詳細を第１図に図示の実施例により説明する。The details of the invention will be explained with reference to the embodiment shown in FIG.
第３図で説明した従来法と同一の部分は重複するので省
略するが、本発明法は次の３つの特徴がある。The same parts as the conventional method explained in FIG. 3 will be omitted because they overlap, but the method of the present invention has the following three features.
まず、第１にミキサー１２の排出側コンベアー２２に水
分計２８が設置され、焼結原料中の水分が１６〜２０％
になる如く湿ダスト２および乾ダスト１４の装入量を調
整し、調整に必要な乾ダスト１４の量が不足する場合に
はコンベアー２６で運搬されている乾燥造粒後の焼結原
料の一部をダンパー２８により分離しコンベアー３０．
３２によりミキサー１２に返送し水分を調整する。ダン
パー２８で分離された残りの焼結原料はコンベアー３４
により運搬される。焼結原料中の水分が１６％未満の場
合はロータリードライヤー２４における造粒が不十分と
なり焼結原料として不適となり、２０％を越えるとロー
タリードライヤー２４内に付着し詰りを生じるのでロー
タリードライヤー２４に装入する水分を１６〜２０％の
範囲に限定した。First, a moisture meter 28 is installed on the discharge side conveyor 22 of the mixer 12, and the moisture in the sintered raw material is 16 to 20%.
Adjust the amount of wet dust 2 and dry dust 14 to be charged, and if the amount of dry dust 14 required for adjustment is insufficient, some of the sintered raw material after dry granulation carried by the conveyor 26 will be charged. The portions are separated by a damper 28 and transferred to a conveyor 30.
32, it is returned to the mixer 12 and the water content is adjusted. The remaining sintering raw material separated by the damper 28 is transferred to the conveyor 34
transported by. If the moisture content in the sintering raw material is less than 16%, the granulation in the rotary dryer 24 will be insufficient and it will be unsuitable as a sintering raw material. If it exceeds 20%, it will adhere to the inside of the rotary dryer 24 and cause clogging, so The moisture charged was limited to a range of 16-20%.
次に、第２の点は、コンベアー２６に設けられた水分計
３６により水分を検出しロータリードライヤー２４にる
乾燥造粒後の焼結原料の水分が１０〜１４％になる如く
ロータリードライヤー２４のバーナー３８の燃焼を制御
することである。乾燥造粒後の焼結原料の水分が１０％
未満では、造粒が不十分となゆ一部が微粉となり焼結原
料として適さず、一方、１４％を越すと各種の装置に付
着して詰りの原因となるので水分を１０〜１４％の範囲
に限定した。Next, the second point is to detect moisture with a moisture meter 36 installed on the conveyor 26, and to control the rotary dryer 24 so that the moisture content of the sintered raw material after drying and granulation in the rotary dryer 24 is 10 to 14%. This is to control the combustion of the burner 38. The moisture content of the sintered raw material after dry granulation is 10%.
If it is less than 14%, the granulation will be insufficient and some of it will become fine powder, making it unsuitable as a sintering raw material.On the other hand, if it exceeds 14%, it will adhere to various devices and cause clogging, so reduce the moisture content to 10 to 14%. limited to a range.
最後に第３の点は、コンベアー３４で運搬された乾燥造
粒後の焼結原料は７ＩＴＩＩ１１程度の篩４０で篩分け
られ篩上は破砕機４２で破砕されコンベアー３２でミキ
サー１２に返送される。一方、篩下は０５〜７胴程度の
焼結原料として最適の粒度となっており、コンベアー４
４によって焼結炉へ運博される。第１図に図示の本発明
法および第３図に図示した従来法で製造した焼結原料の
粒度をそれぞれ調査し、その結果を第２図に示した。第
２図から、本発明法は従来法に比して焼結鉱品質上悪影
響のある７ ｍｍ以上の粗粒が大幅に減少し、好ましい
２ＩｗＩａ程度の粒子が増加していることが分かる。Finally, the third point is that the sintered raw material after drying and granulation transported by the conveyor 34 is sieved by a sieve 40 of about 7ITII11, the sieve surface is crushed by a crusher 42, and the conveyor 32 returns to the mixer 12. . On the other hand, the undersieve has the optimum particle size as a sintering raw material for 05 to 7 cylinders, and conveyor 4
4 to the sintering furnace. The particle sizes of the sintering raw materials produced by the method of the present invention shown in FIG. 1 and the conventional method shown in FIG. 3 were investigated, and the results are shown in FIG. From FIG. 2, it can be seen that in the method of the present invention, coarse particles of 7 mm or more, which have an adverse effect on the quality of sintered ore, are significantly reduced, and the preferable particles of about 2IwIa are increased, compared to the conventional method.
本発明はロータリードライヤーの装入前および排出後の
水分量を限定し、乾燥造粒後の焼結原料の一部をミキサ
ーに返送して水分量を調整し、更に乾燥造粒後の焼結原
料の粒度による選別を行うことによって次の効果を挙げ
ることができた。The present invention limits the amount of moisture before charging the rotary dryer and after discharging it, returns a part of the sintered raw material after drying and granulation to the mixer to adjust the amount of moisture, and further sinters the raw material after drying and granulation. By sorting raw materials based on their particle size, we were able to achieve the following effects.
（イ）焼結操業上に最適の粒度分布の焼結原料を製造で
きる。(a) It is possible to produce a sintering raw material with an optimal particle size distribution for sintering operations.
（ロ） ロータリードライヤー内への付着物の生成を防
止し安定した操業ができる。(b) Prevents the formation of deposits inside the rotary dryer and enables stable operation.
第１図は本発明法を示す焼結原料製造装置の配置図、第
２図は本発明法および従来法により製造された焼結原料
の粒度分布を示す線図、第３図は従来法を示す焼結原料
製造装置の配置図である。Fig. 1 is a layout diagram of a sintered raw material manufacturing apparatus showing the method of the present invention, Fig. 2 is a diagram showing the particle size distribution of sintered raw materials produced by the method of the present invention and the conventional method, and Fig. 3 is a diagram showing the particle size distribution of the sintered raw materials produced by the method of the present invention and the conventional method. FIG. 2 is a layout diagram of the sintered raw material manufacturing apparatus shown in FIG.
Claims (1)
サーにて混合しロータリードライヤーで乾燥造粒する焼
結原料の製造方法において、前記ミキサーにおける焼結
原料の水分が１６〜２０％になる如く湿ダストおよび乾
ダストの装入量を調整し、調整に必要な乾ダストの量が
不足する場合には前記乾燥造粒後の焼結原料の一部をミ
キサーに返送する段階と、前記ロータリードライヤーに
よる乾燥造粒後の焼結原料の水分が１０〜１４％になる
如くロータリードライヤーのバーナーの燃焼を制御する
段階と、前記ロータリードライヤーにおける乾燥造粒後
の焼結原料を篩分けし篩上に残った焼結原料を破砕して
前記ミキサーに返送する段階と、を有して成ることを特
徴とする製鉄ダストからの焼結原料製造方法。(1) In a method for producing a sintered raw material in which wet dust and dry dust generated in a steelworks are mixed in a mixer and dried and granulated in a rotary dryer, the moisture content of the sintered raw material in the mixer is 16 to 20%. a step of adjusting the charging amount of wet dust and dry dust, and returning a part of the sintered raw material after dry granulation to the mixer when the amount of dry dust necessary for adjustment is insufficient; a step of controlling the combustion of the burner of the rotary dryer so that the moisture content of the sintered raw material after drying and granulation is 10 to 14%; A method for producing a sintering raw material from ironmaking dust, comprising the step of crushing the remaining sintering raw material and returning it to the mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26042687A JPH01104723A (en) | 1987-10-15 | 1987-10-15 | Production of sintering raw material from iron making dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26042687A JPH01104723A (en) | 1987-10-15 | 1987-10-15 | Production of sintering raw material from iron making dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01104723A true JPH01104723A (en) | 1989-04-21 |
Family
ID=17347770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26042687A Pending JPH01104723A (en) | 1987-10-15 | 1987-10-15 | Production of sintering raw material from iron making dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01104723A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03215631A (en) * | 1990-01-17 | 1991-09-20 | Sumitomo Metal Ind Ltd | Disintegrating method for dehydrated cake of filter press |
| JPH03291330A (en) * | 1990-04-10 | 1991-12-20 | Kawasaki Steel Corp | Manufacture of sintering raw material from dust in iron manufacturing |
| JP2007138246A (en) * | 2005-11-17 | 2007-06-07 | Nippon Steel Corp | Pretreatment method and pretreatment apparatus for sintering raw material |
| JP2007332428A (en) * | 2006-06-16 | 2007-12-27 | Jfe Steel Kk | Method for treating wet dust and method for producing sintered ore |
| WO2008081750A1 (en) * | 2006-12-28 | 2008-07-10 | Jtekt Corporation | Iron-based powder material, method for producing the same, and briquette for steelmaking material |
-
1987
- 1987-10-15 JP JP26042687A patent/JPH01104723A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03215631A (en) * | 1990-01-17 | 1991-09-20 | Sumitomo Metal Ind Ltd | Disintegrating method for dehydrated cake of filter press |
| JPH03291330A (en) * | 1990-04-10 | 1991-12-20 | Kawasaki Steel Corp | Manufacture of sintering raw material from dust in iron manufacturing |
| JP2007138246A (en) * | 2005-11-17 | 2007-06-07 | Nippon Steel Corp | Pretreatment method and pretreatment apparatus for sintering raw material |
| JP2007332428A (en) * | 2006-06-16 | 2007-12-27 | Jfe Steel Kk | Method for treating wet dust and method for producing sintered ore |
| WO2008081750A1 (en) * | 2006-12-28 | 2008-07-10 | Jtekt Corporation | Iron-based powder material, method for producing the same, and briquette for steelmaking material |
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