JPS629653B2 - - Google Patents
Info
- Publication number
- JPS629653B2 JPS629653B2 JP57113378A JP11337882A JPS629653B2 JP S629653 B2 JPS629653 B2 JP S629653B2 JP 57113378 A JP57113378 A JP 57113378A JP 11337882 A JP11337882 A JP 11337882A JP S629653 B2 JPS629653 B2 JP S629653B2
- Authority
- JP
- Japan
- Prior art keywords
- quicklime
- dust
- added
- quicklime dust
- portland cement
- 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
Links
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 48
- 239000000292 calcium oxide Substances 0.000 claims description 24
- 235000012255 calcium oxide Nutrition 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Description
この発明は、石灰焼成キルン、石灰貯蔵ホツパ
ー等から発生する生石灰ダストをコールドボンド
ペレツト等の非焼成塊成鉱の原料の一部に配合す
ることによる生石灰ダストの処理方法に関する。
石灰焼成キルン、石灰貯蔵ホツパー等から発生
する生石灰ダストは65〜95%の生石灰成分を含ん
でいるにもかかわらず、粒径100μ以下の極微粉
であること、強アルカリ性に加えて危検物である
ことから有効利用はもとより廃棄処分も難しい。
すなわち、粒径100μ以下の極微粒では製鋼用原
料として利用し難く、また水と接すると高アルカ
リ水を溶出するため埋立て用としても使用でき
ず、さらに貯蔵中には大気中の水分を吸収して発
熱するため、生石灰ダストの処理は容易でない。
なお、従来は公害等の問題が発生しないよう厳し
い管理のもと廃棄されている。
ところで、高炉に使用する非焼成塊成鉱として
は、周知のとおり、粉鉱石に水硬性バインダー
(通常セメント)と適当な水を加えて製造される
コールドボンドペレツトが代表的であるが、省資
源の立場から、従来水硬性バインダーとして使用
されてきたポルトランドセメントに替えて、高炉
の副成品で潜在水硬性を持つ高炉水滓スラグとポ
ルトランドセメントの混合物をバインダーとして
用いる方法が提案されている。しかし、これまで
に提案されているコールドボンド鉱の製造技術の
中で、粉鉱石を塊成化する際に生石灰ダストを配
合し、生石灰ダストを処分する方法は未だ見当ら
ない。
この発明者らは、従来廃棄処分も困難であつた
生石灰ダストを処理すべく検討した結果、コール
ドボンド鉱の製造において、生石灰ダストを用い
ても、コールドボンド鉱の冷間強度、熱間強度は
普通ポルトランドセメントのみ添加した場合とほ
ぼ同等の値が得られることを見い出した。
すなわち、この発明は、粉鉱石にバインダーと
適量の水を混合して成型後、養生して塊成化する
方法において、粉鉱石に対し0.2〜25%の生石灰
ダストを配合し、もつて生石灰ダストを処理する
ことを特徴とする方法であり、鉱石の銘柄によつ
ては生石灰ダストのみで十分な強度が得られるも
のもある。なお、生石灰ダストの配合に際し、ポ
ルトランドセメント、あるいはポルトランドセメ
ントと水滓スラグの混合物を併用してもよい。
この発明において、上記の性能を発現させるた
めの好ましい生石灰ダストの配合量は、主原料に
対して0.2〜25%である。すなわち、0.2%以下で
はバインダーとしての役目が得られず、また25%
以上では生石灰ダストが多くなりかえつて強度が
低下する。
次に、この発明の実施例について説明する。
実施例 1
第1表に示す組成を有し、第2表に示す粒度構
成の粉鉱石Aを20%、Bを20%、Cを60%を主原
料とし、この主原料に対して5.6〜2.4%のポルト
ランドセメント、24〜5.6%の高炉水滓(粒度
4000cm2/g)と0.24%の生石灰ダストを結合剤と
して配合し、これに同じく8%の水を加えて混練
し、加圧成型機により11mmφ×10mmの円柱状に成
型し、これを20℃飽和蒸気中で2時間養生し、さ
らに70℃飽和蒸気中で8時間養生して得られた非
焼成塊成鉱の圧潰強度を第1図に示す。さらに
110℃で2時間乾燥し、JIS還元した後の圧潰強度
を第2図に示す。なお、第1図、第2図には本実
施例と同一量の消石灰を添加した場合と、生石灰
ダスト、消石灰ダストのいずれも無添加の場合
(ただし、ポルトランドセメントを8%添加)の
圧潰強度を併せて示し、またJIS還元時の還元率
は82〜84%であつた。
第1図、第2図より、高炉水滓を配合しない場
合(縦軸でポルトランドセメントのみ添加)、廃
棄処理に困つていた生石灰ダストを混合すること
により、ポルトランドセメントのみの添加のもの
と同等の強度が得られた。
The present invention relates to a method for treating quicklime dust by blending the quicklime dust generated from a lime burning kiln, lime storage hopper, etc. into a part of raw material of uncalcined agglomerate such as cold bond pellets. Although quicklime dust generated from lime-burning kilns, lime storage hoppers, etc. contains 65 to 95% quicklime, it is extremely fine powder with a particle size of less than 100μ, is strongly alkaline, and is a dangerous substance. Because of this, it is difficult not only to utilize it effectively but also to dispose of it.
In other words, ultrafine particles with a particle size of 100μ or less are difficult to use as raw materials for steelmaking, and cannot be used in landfills because they elute highly alkaline water when they come into contact with water.Furthermore, they absorb moisture from the atmosphere during storage. Quicklime dust is difficult to dispose of because it generates heat.
In the past, waste was disposed of under strict management to prevent problems such as pollution. By the way, as is well known, the typical non-fired agglomerate used in blast furnaces is cold bond pellets, which are produced by adding a hydraulic binder (usually cement) to fine ore and a suitable amount of water. From a resource standpoint, a method has been proposed in which a mixture of blast furnace water slag, which is a by-product of blast furnaces and has latent hydraulic properties, and Portland cement is used as a binder in place of Portland cement, which has traditionally been used as a hydraulic binder. However, among the cold bond ore production techniques that have been proposed so far, there is still no method of mixing quicklime dust when agglomerating fine ore and disposing of the quicklime dust. As a result of studying how to dispose of quicklime dust, which has conventionally been difficult to dispose of, the inventors found that even if quicklime dust was used in the production of cold bond ore, the cold strength and hot strength of cold bond ore could be reduced. It has been found that almost the same value can be obtained as when only ordinary Portland cement is added. That is, in the method of mixing fine ore with a binder and an appropriate amount of water, molding, curing, and agglomerating, the present invention blends 0.2 to 25% quicklime dust to fine ore, and forms quicklime dust. Depending on the brand of ore, sufficient strength can be obtained with just quicklime dust. In addition, when blending the quicklime dust, Portland cement or a mixture of Portland cement and water slag may be used in combination. In this invention, the preferred amount of quicklime dust to exhibit the above performance is 0.2 to 25% based on the main raw material. In other words, if it is less than 0.2%, it cannot function as a binder, and if it is less than 25%
Above this, the amount of quicklime dust increases and the strength decreases. Next, embodiments of the invention will be described. Example 1 The main raw materials are 20% powdered ore A, 20% B, and 60% C with the composition shown in Table 1 and the particle size structure shown in Table 2. 2.4% Portland cement, 24-5.6% blast furnace water slag (particle size
4000cm 2 /g) and 0.24% quicklime dust as a binder, 8% water was added to this, kneaded, and molded into a cylindrical shape of 11mmφ x 10mm using a pressure molding machine. Figure 1 shows the crushing strength of the uncalcined agglomerate obtained by curing for 2 hours in saturated steam and further 8 hours in 70°C saturated steam. moreover
Figure 2 shows the crushing strength after drying at 110°C for 2 hours and JIS reduction. In addition, Figures 1 and 2 show the crushing strength when the same amount of slaked lime as in this example was added, and when neither quicklime dust nor slaked lime dust was added (however, 8% of Portland cement was added). The reduction rate during JIS reduction was 82 to 84%. From Figures 1 and 2, it can be seen that when blast furnace water slag is not mixed (only Portland cement is added on the vertical axis), by mixing quicklime dust, which has been difficult to dispose of, it is equivalent to adding only Portland cement. strength was obtained.
【表】【table】
【表】
実施例 2
第1表Cの組成と第2表Cの粒度をもつ鉱石
に、生石灰ダストのみを20%加え、これに8%の
水を加えて混練し、加圧成型機により11mmφ×10
mmの円柱状に成型し、これを20℃飽和蒸気中で2
時間養生し、さらに70℃で24時間養生して得られ
た圧潰強度を第3表に示す。なお、第3表には比
較のため、実施例1の普通ポルトランドセメント
を8%添加した場合を併せて示した。
第3表より明らかなごとく、生石灰ダストのみ
添加してもポルトランドセメントのみの添加と同
等の強度が得られた。[Table] Example 2 20% quicklime dust alone was added to ore having the composition shown in Table 1 C and the particle size shown in Table 2 C, and 8% water was added to the ore and kneaded. ×10
Mold into a cylindrical shape with a diameter of
Table 3 shows the crushing strength obtained after curing for an hour and then curing for 24 hours at 70°C. For comparison, Table 3 also shows the case where 8% of the ordinary Portland cement of Example 1 was added. As is clear from Table 3, even when only quicklime dust was added, the same strength was obtained as when only Portland cement was added.
【表】
以上のごとく、生石灰ダストを非焼成塊成鉱の
結合剤として用いても、ポルトランドセメントの
みの添加の場合とほぼ同等の強度が得られ、悪影
響をおよぼさないことが明らかである。従つて、
この発明法によれば、これまで処理に苦慮してき
た生石灰ダストの処分が可能となり、工業的に有
益な発明である。[Table] As shown above, it is clear that even when quicklime dust is used as a binder for uncalcined agglomerates, almost the same strength can be obtained as when only Portland cement is added, and there is no adverse effect. . Therefore,
According to the method of this invention, it is possible to dispose of quicklime dust, which has been difficult to dispose of up to now, and is an industrially useful invention.
第1図および第2図はこの発明の実施例におけ
る高炉水滓配合量と圧潰強度の関係を示す図表で
ある。
FIGS. 1 and 2 are charts showing the relationship between blast furnace water slag content and crushing strength in Examples of the present invention.
Claims (1)
型後、養生して塊成化する方法において、粉鉱石
に対し0.2〜25%の生石灰ダストを配合すること
を特徴とする生石灰ダストの処理方法。1. A method for treating quicklime dust, which is characterized by mixing 0.2 to 25% quicklime dust to the powder ore, in a method in which powder ore is mixed with a binder and an appropriate amount of water, molded, and then cured and agglomerated. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57113378A JPS596333A (en) | 1982-06-30 | 1982-06-30 | Treatment of caustic lime dust |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57113378A JPS596333A (en) | 1982-06-30 | 1982-06-30 | Treatment of caustic lime dust |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS596333A JPS596333A (en) | 1984-01-13 |
JPS629653B2 true JPS629653B2 (en) | 1987-03-02 |
Family
ID=14610770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57113378A Granted JPS596333A (en) | 1982-06-30 | 1982-06-30 | Treatment of caustic lime dust |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS596333A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19708376C1 (en) * | 1997-03-01 | 1998-07-02 | Gasteier & Bilke Verfahrenstec | Use of a briquette made from waste materials as an additive for smelting furnaces in an iron foundry |
KR100380735B1 (en) * | 1998-08-07 | 2003-09-19 | 주식회사 포스코 | METHOD FOR HYDRATING DUST CONTAINING CaO FOR MANUFACTURING BRIQUET |
KR100782750B1 (en) * | 2001-12-26 | 2007-12-05 | 주식회사 포스코 | Sinterd ore having low reduction degradation at low temperature |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5616077A (en) * | 1979-07-19 | 1981-02-16 | Nippon Steel Corp | Drying of wet dust* sludge and others by mixing powdered lime |
JPS579840A (en) * | 1980-06-20 | 1982-01-19 | Nippon Kokan Kk <Nkk> | Unfired briquetted ore for iron manufacture |
JPS5760003A (en) * | 1980-09-29 | 1982-04-10 | Nippon Steel Corp | Production of controlling grain for steel bath temperature |
JPS5760169A (en) * | 1980-09-29 | 1982-04-10 | Nippon Steel Corp | Natural drying of granular solid containing water |
JPH05124619A (en) * | 1991-10-24 | 1993-05-21 | Kawasaki Steel Corp | Automatic binding apparatus |
-
1982
- 1982-06-30 JP JP57113378A patent/JPS596333A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5616077A (en) * | 1979-07-19 | 1981-02-16 | Nippon Steel Corp | Drying of wet dust* sludge and others by mixing powdered lime |
JPS579840A (en) * | 1980-06-20 | 1982-01-19 | Nippon Kokan Kk <Nkk> | Unfired briquetted ore for iron manufacture |
JPS5760003A (en) * | 1980-09-29 | 1982-04-10 | Nippon Steel Corp | Production of controlling grain for steel bath temperature |
JPS5760169A (en) * | 1980-09-29 | 1982-04-10 | Nippon Steel Corp | Natural drying of granular solid containing water |
JPH05124619A (en) * | 1991-10-24 | 1993-05-21 | Kawasaki Steel Corp | Automatic binding apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS596333A (en) | 1984-01-13 |
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