JPH04198047A - Production of base course material utilizing slag - Google Patents
Production of base course material utilizing slagInfo
- Publication number
- JPH04198047A JPH04198047A JP33140990A JP33140990A JPH04198047A JP H04198047 A JPH04198047 A JP H04198047A JP 33140990 A JP33140990 A JP 33140990A JP 33140990 A JP33140990 A JP 33140990A JP H04198047 A JPH04198047 A JP H04198047A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- vessel
- molten iron
- hot metal
- base course
- 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
- 239000002893 slag Substances 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 239000006227 byproduct Substances 0.000 abstract description 6
- 239000002440 industrial waste Substances 0.000 abstract description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 6
- 239000000377 silicon dioxide Substances 0.000 abstract 3
- 238000007598 dipping method Methods 0.000 abstract 1
- 230000008961 swelling Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はスラグを利用した路盤材の製造方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a roadbed material using slag.
（従来の技術）
製鉄所で副生ずる各種スラグは産業廃棄物として廃棄処
理するものもあるが、高炉スラグのようにセメント原料
や路盤材として利用されているものもある。また、製鋼
スラグのように膨張自壊性があるため、その用途に制限
があるものもある。(Prior Art) Some of the various types of slag that are produced as by-products in steel mills are disposed of as industrial waste, but others, such as blast furnace slag, are used as raw materials for cement and roadbed materials. Additionally, some materials, such as steelmaking slag, have a tendency to expand and self-destruct, so their uses are limited.
製鋼スラグを道路路盤材に用いるとアスファルト舗装面
が盛り上がり、道路の供用性、耐久性が著しく損なわれ
ることから、この対策として、転炉スラグと高炉スラグ
とを溶融状態にて混和し、転炉スラグが含有する過剰の
石灰分を高炉スラグが含有する過剰の珪酸分によって中
和する方法（特公昭４８−３０６５号公報）及び保温し
た混合容器に高炉スラグを溶融状態で貯蔵しておき、こ
の中に溶融状態の転炉スラグを落下混合させて混合スラ
グを製造する方法（特開昭５０−９８９２７号公報）が
知られている。When steelmaking slag is used as a road base material, the asphalt pavement surface swells up, significantly impairing the usability and durability of the road.As a countermeasure to this problem, converter slag and blast furnace slag are mixed in a molten state. A method in which the excess lime contained in the slag is neutralized by the excess silicic acid contained in the blast furnace slag (Japanese Patent Publication No. 48-3065), and the blast furnace slag is stored in a molten state in a heated mixing container. A method is known in which mixed slag is produced by dropping and mixing molten converter slag into the steel (Japanese Unexamined Patent Publication No. 50-98927).
更に、近年極低硫鋼等高級網の製造に伴い、溶銑段階で
各種不純物を予め膜処理する溶銑予備処理法が種々提案
されており、その一つとして、溶銑を脱珪処理し、次い
で容器内で脱燐処理する溶銑の事前処理方法において、
脱燐処理された溶銑のみを容器外へ排出し、脱燐スラグ
を残留させたままの該容器を、高炉よりの新たな溶銑の
脱珪処理工程に用いる溶銑の事前処理法（特公昭６０−
５９９６２号公報）がある。Furthermore, in recent years, with the production of high-grade nets such as ultra-low sulfur steel, various hot metal pretreatment methods have been proposed in which various impurities are treated with a film in advance during the hot metal stage. In the pre-treatment method for hot metal that is dephosphorized in
Only the dephosphorized hot metal is discharged out of the container, and the container with the dephosphorization slag left is used for the desiliconization process of new hot metal from the blast furnace.
No. 59962).
（発明が解決しようとする課題）
転炉スラグの改質策として転炉スラグと高炉スラグを溶
融状態で混合する特公昭４Ｂ −８０６５号公報記載の
技術は、製鉄所内における高炉と転炉間の距離の問題、
各スラグの生成タイミングのずれ、両スラグの温度や成
分のバラツキ等の問題があり、両スラグを溶融状態で混
合することは極めて困難である。また、特開昭５０−９
８９２７号公報記載のものは前記特公昭４Ｂ −８０６
５号の改良技術であるが、高炉スラグを保温容器内で保
温しなければならず、該保温容器の耐火物の消耗や保温
に必要な熱源の問題、得られる混合スラグの品質や作業
性に難点があり実用化には至っていない。特公昭６０−
５９９６２号公報記載のものは、溶銑の事前処理時に脱
燐スラグの排滓工程が省略できること、脱燐スラグ中に
取り込まれて排出される鉄分の損失がなくなるという利
点があり、現在実用化されている技術であるが、脱燐ス
ラグと脱珪スラグとが混合した新しいタイプの混合スラ
グを副生ずることとなり、大量に発生するその混合スラ
グは産業廃棄物として処理しなければならないという問
題があった。(Problems to be Solved by the Invention) The technology described in Japanese Patent Publication No. 4B-8065 for mixing converter slag and blast furnace slag in a molten state as a reforming measure for converter slag is a method for improving converter slag. distance problem,
It is extremely difficult to mix both slags in a molten state due to problems such as differences in the timing of generation of each slag and variations in temperature and composition of both slags. Also, JP-A-50-9
The one described in Publication No. 8927 is the above-mentioned Japanese Patent Publication No. 4B-806
Although this is the improved technology No. 5, blast furnace slag must be kept warm in a heat-insulating container, and there are problems with consumption of the refractory in the heat-insulating container, the heat source necessary for heat insulation, and the quality and workability of the mixed slag obtained. It has some drawbacks and has not been put into practical use. Special Public Service 1986-
The method described in Publication No. 59962 has the advantage that the step of removing the dephosphorization slag during pre-treatment of hot metal can be omitted, and there is no loss of iron that is taken in and discharged from the dephosphorization slag, and is currently in practical use. However, there was a problem in that a new type of mixed slag, which is a mixture of dephosphorization slag and desiliconization slag, was produced as a by-product, and the large amount of mixed slag generated had to be disposed of as industrial waste. .
本発明は前記従来技術の問題点を有利に解決したスラグ
処理方法を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a slag treatment method that advantageously solves the problems of the prior art.
（課題を解決するための手段）
本発明の要旨とするところは、容器内で溶銑の脱燐処理
を行った後、溶銑のみを容器外へ排出して容器内に脱燐
スラグを残留させたまま該容器内で新たな溶銑の脱珪処
理を行い、得られた脱珪スラグを排滓し、冷却し、破砕
することを特徴とするスラグを利用した路盤材の製造方
法にある。(Means for Solving the Problems) The gist of the present invention is that after dephosphorizing hot metal in a container, only the hot metal is discharged outside the container, leaving dephosphorization slag in the container. The present invention provides a method for producing a roadbed material using slag, characterized in that fresh hot metal is desiliconized in the container, and the obtained desiliconized slag is slaged, cooled, and crushed.
（作 用）
溶銑の脱珪処理は、高炉から出銑された溶銑をトーピー
ドカー内で溶銑にミルスケール等の酸素源を添加して行
うために副生する脱珪スラグ中の５ｉ０２含有率は３０
〜４０％と高い。これに対し溶銑の脱燐処理は溶銑中に
ミルスケール、ＣａＯ。(Function) The desiliconization treatment of hot metal is carried out by adding an oxygen source such as mill scale to the hot metal tapped from the blast furnace in a torpedo car.
It is high at ~40%. On the other hand, dephosphorization treatment of hot metal produces mill scale and CaO in the hot metal.
ＣａＦ２等の混合フラックスを添加、混合攪拌して行う
ため、得られる脱燐スラグはＣａＯ含有率が５０〜６０
％と高い。Since the dephosphorization is carried out by adding, mixing and stirring a mixed flux such as CaF2, the resulting dephosphorization slag has a CaO content of 50 to 60.
% and high.
したがって、脱燐スラグをトーピードカー内に残留させ
たまま新たな溶銑の脱珪処理を行った際に得られる脱珪
スラグは、前記単独に行う脱珪処理と脱燐処理時にそれ
ぞれ得られるスラグが混合された如き組成のスラグが副
生され、脱珪処理時に溶銑を介して十分混合されている
ので極めて均質で、ＣａＯ含有率３５〜４７％、５ｉＯ
ｚ含有率１２〜２２％程度の、高炉スラグと転炉スラグ
を混合した混合スラグに類似した組成のスラグが副生さ
れる。Therefore, the desiliconizing slag obtained when new hot metal is desiliconized while the dephosphorizing slag remains in the torpedo car is a mixture of the slag obtained during the desiliconizing process performed separately and the slag obtained during the dephosphorizing process. A slag with a composition similar to the above is produced as a by-product, and it is thoroughly mixed through the hot metal during the desiliconization process, so it is extremely homogeneous, with a CaO content of 35 to 47% and a 5iO
Slag having a z content of about 12 to 22% and a composition similar to mixed slag made by mixing blast furnace slag and converter slag is produced as a by-product.
この脱珪スラグは排滓後冷却し破砕することにより、道
路路盤材として使用できる性質を備えている。This desiliconized slag has properties that can be used as a road base material by cooling and crushing it after being discharged.
（実施例）
第１図は本発明に係る脱珪スラグと転炉スラグの膨張性
を比較して示した図である。同図に示すとおり本発明に
係る脱珪スラグの水浸膨張比は転炉スラグより小さく、
エージングを３か月間行うと膨張は安定化し、アスファ
ルト舗装要綱で転炉スラグの場合エージング期間６か月
収上、８０°Ｃ水浸膨張比１．５％以下の規定を満足し
ている。(Example) FIG. 1 is a diagram showing a comparison of the expansibility of desiliconization slag and converter slag according to the present invention. As shown in the figure, the water immersion expansion ratio of the desiliconized slag according to the present invention is smaller than that of converter slag,
After 3 months of aging, the expansion stabilizes, and in the case of converter slag, the asphalt pavement requirements meet the 80°C water immersion expansion ratio of 1.5% or less for a 6-month aging period.
第２図は本発明の路盤材を下層路盤材として用いた道路
の供用性、耐久性の実路試験結果を示す図である。実路
試験の舗装構成を第３図に示す。FIG. 2 is a diagram showing the results of an actual road test of the serviceability and durability of a road using the roadbed material of the present invention as a lower layer roadbed material. Figure 3 shows the pavement configuration used in the actual road test.
第２図に示すように、本発明の路盤材はたわみ量、平坦
性とも高炉スラグ路盤材より優れた値を示した。As shown in FIG. 2, the roadbed material of the present invention exhibited superior values in both deflection and flatness than the blast furnace slag roadbed material.
本発明の路盤材の物理特性を高炉スラグ路盤材と比較し
て表１に、また路盤効果をみるために施工時に行った路
床及び路盤上の平板載荷試験結果を表２に示す。Table 1 shows a comparison of the physical properties of the roadbed material of the present invention with that of the blast furnace slag roadbed material, and Table 2 shows the results of a flat plate loading test on the roadbed and roadbed, which was conducted during construction to examine the roadbed effect.
表１
表２
表１及び表２に示すように本発明の路盤材は８０℃水浸
膨張比： ０．４８％、修正ＣＢＲ： ６０でアスファ
ルト舗装要綱の品質規格を満足しており、平板載荷試験
でのに、／に２値も高炉スラグ路盤材と大差なく、はぼ
同等の路盤効果が期待できることが分った。Table 1 Table 2 As shown in Tables 1 and 2, the roadbed material of the present invention satisfies the quality standards of the asphalt pavement guidelines with an 80°C water immersion expansion ratio of 0.48% and a modified CBR of 60. In the test, it was found that the two values for / were not significantly different from those of blast furnace slag roadbed material, and that it can be expected to have a roadbed effect equivalent to that of blast furnace slag roadbed material.
（発明の効果）
以上述べたように、本発明は溶銑予備処理時に副生する
脱燐スラグを含む脱珪スラグを道路路盤材として有効利
用するものであるから、これまでは新しいタイプの産業
廃棄物として廃棄処理していたその処理費を削減できる
ばかりでなく、大量に発生する産業廃棄物を資源化する
ことによる経済的効果は顕著なものがあり、省資源の面
、環境管理の面においてもその果す役割は大きい。(Effects of the Invention) As described above, the present invention effectively utilizes desiliconization slag, including dephosphorization slag, which is produced as a by-product during hot metal pretreatment, as a road base material. Not only can you reduce the cost of disposing of industrial waste, but the economic effect of converting large amounts of industrial waste into resources is significant, and it is effective in terms of resource conservation and environmental management. It also plays an important role.
第１図は本発明に係る脱珪スラグと転炉スラグの膨張性
を比較して示す図、第２図は本発明の路盤材を下層路盤
材として用いた実路試験結果を示す図、第３図は第２図
の実路試験に用いた舗装構成を示す図である。Fig. 1 is a diagram showing a comparison of the expansibility of desiliconization slag and converter slag according to the present invention, Fig. 2 is a diagram showing actual road test results using the roadbed material of the present invention as a lower roadbed material, Figure 3 is a diagram showing the pavement configuration used in the actual road test shown in Figure 2.
Claims (1)
へ排出して容器内に脱燐スラグを残留させたまま該容器
内で新たな溶銑の脱珪処理を行い、得られた脱珪スラグ
を排滓し、冷却し、破砕することを特徴とするスラグを
利用した路盤材の製造方法。After dephosphorizing the hot metal in the container, only the hot metal is discharged outside the container, and with the dephosphorization slag remaining in the container, new desiliconization treatment of the hot metal is performed in the container. A method for producing a roadbed material using slag, which comprises discharging, cooling, and crushing desiliconized slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33140990A JPH04198047A (en) | 1990-11-29 | 1990-11-29 | Production of base course material utilizing slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33140990A JPH04198047A (en) | 1990-11-29 | 1990-11-29 | Production of base course material utilizing slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04198047A true JPH04198047A (en) | 1992-07-17 |
Family
ID=18243366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33140990A Pending JPH04198047A (en) | 1990-11-29 | 1990-11-29 | Production of base course material utilizing slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04198047A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5098927A (en) * | 1973-12-29 | 1975-08-06 | ||
| JPS6059962A (en) * | 1983-09-08 | 1985-04-06 | Copal Denshi Kk | Dc brushless motor |
| JPH02204348A (en) * | 1989-01-31 | 1990-08-14 | Nippon Jiryoku Senko Kk | Method and device for reforming slag |
-
1990
- 1990-11-29 JP JP33140990A patent/JPH04198047A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5098927A (en) * | 1973-12-29 | 1975-08-06 | ||
| JPS6059962A (en) * | 1983-09-08 | 1985-04-06 | Copal Denshi Kk | Dc brushless motor |
| JPH02204348A (en) * | 1989-01-31 | 1990-08-14 | Nippon Jiryoku Senko Kk | Method and device for reforming slag |
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