JPH07172882A - Method for reforming steel slag - Google Patents
Method for reforming steel slagInfo
- Publication number
- JPH07172882A JPH07172882A JP5324701A JP32470193A JPH07172882A JP H07172882 A JPH07172882 A JP H07172882A JP 5324701 A JP5324701 A JP 5324701A JP 32470193 A JP32470193 A JP 32470193A JP H07172882 A JPH07172882 A JP H07172882A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- gypsum
- sulfuric acid
- cao
- reaction
- 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 60
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010959 steel Substances 0.000 title claims abstract description 14
- 238000002407 reforming Methods 0.000 title claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000010440 gypsum Substances 0.000 claims abstract description 30
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 43
- 239000000292 calcium oxide Substances 0.000 abstract description 25
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 238000009628 steelmaking Methods 0.000 abstract description 13
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 235000012255 calcium oxide Nutrition 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000000243 solution Substances 0.000 description 10
- 229910004298 SiO 2 Inorganic materials 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004445 quantitative analysis Methods 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000006057 reforming reaction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、製鉄所の製錬工程から
発生する鉄鋼スラグの改質方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reforming steel slag generated from a smelting process in an iron mill.
【０００２】[0002]
【従来の技術】高炉スラグや製鋼スラグに代表される鉄
鋼スラグの再利用は古くから試みられている。高炉スラ
グに関しては、当初は徐冷スラグを土地造成用および路
盤材に利用する程度であったが、徐々に水砕スラグのセ
メント原料への用途開発が進み、現状では圧倒的な割合
を占めるに至っている。これは高炉スラグの化学成分が
ポルトランドセメントに近いことや優れた潜在水硬性を
有効に利用しており、現在、高炉スラグの利用率は１０
０％である。2. Description of the Related Art Reuse of steel slag represented by blast furnace slag and steelmaking slag has been tried for a long time. With regard to blast furnace slag, initially it was only to use slowly cooled slag for land preparation and roadbed materials, but gradually the application development of water granulated slag as a raw material for cement has progressed, and at present, it accounts for an overwhelming proportion. Has arrived. This is because the chemical composition of blast furnace slag is close to that of Portland cement and the excellent latent hydraulic property is effectively used. Currently, the utilization rate of blast furnace slag is 10%.
It is 0%.
【０００３】一方、製鋼スラグは製錬に副原料として用
いる、生石灰が滓化されない、いわゆる遊離酸化カルシ
ウム（ｆｒｅｅ ＣａＯ）を含むために再利用化を抑制
している。すなわち遊離酸化カルシウムが大気中の水と
反応して水和すると体積が約２倍に膨張し、スラグの崩
壊につながるからである。現状では、比較的崩壊に対し
て安定な低塩基度（ＣａＯ／ＳｉＯ2 ）３〜４のものを
大気中で３〜６カ月エージングした後に、道路用材等へ
適用されているが、利用率としては６０〜７０％程度に
留まっている。この製鋼スラグの低い利用率は、近年の
地球環境問題にも係り、今後再利用の促進が望まれてい
る。これに対しては水蒸気加速エージングによる迅速な
改質技術開発等が試みられている。On the other hand, steelmaking slag suppresses the reuse because it contains so-called free calcium oxide (free CaO), which is used as an auxiliary material for smelting and does not slag quicklime. That is, when free calcium oxide reacts with water in the atmosphere and is hydrated, the volume expands about twice and leads to the collapse of slag. At present, it is applied to road materials after aging low-basicity (CaO / SiO 2 ) 3-4, which is relatively stable against disintegration, in the atmosphere for 3-6 months. Is about 60 to 70%. The low utilization rate of this steelmaking slag is related to recent global environmental problems, and promotion of reuse is desired in the future. In response to this, attempts have been made to develop rapid reforming technology by steam aging.
【０００４】しかしながら、これら鉄鋼スラグの再利用
はいずれもスラグ自体の再利用であり、スラグの構成成
分を別の物質に改質し、再利用されている例はない。However, the reuse of these steel slags is the reuse of the slag itself, and there is no example in which the constituent components of the slag are modified to another substance and reused.
【０００５】[0005]
【発明が解決しようとする課題】製鋼スラグが発生する
転炉製錬においては、最近、ドロマイト等を添加して耐
火物の寿命を延ばすための高塩基度精錬や精錬技術の進
歩により高塩基度精錬が行われるようになり、遊離酸化
カルシウムの含有量は増加傾向にあって、膨張崩壊しや
すくなるとい問題がある。本発明は製鋼スラグを硫酸溶
液に浸漬等せしめて、主成分であるＣａＯ（ｆｒｅｅ
ＣａＯ、２ＣａＯ・ＳｉＯ2 、３ＣａＯ・ＳｉＯ2 、２
ＣａＯ・Ｆｅ2 Ｏ3 等の鉱物におけるＣａＯ成分）を反
応させてＣａＳＯ4 ・２Ｈ2 Ｏ（石膏）を生成せしめる
技術を提供することを目的としており、本発明によれば
遊離酸化カルシウムの量に関係なく全てＣａＳＯ4 ・２
Ｈ2Ｏとなるため、従来の膨張崩壊による再利用抑制の
問題がなくなるのみならず、ＣａＯ量が多いほど、Ｃａ
ＳＯ4 ・２Ｈ2 Ｏの生成量も増加することになる。In converter smelting in which steelmaking slag is generated, high basicity smelting or refining technology for extending the life of refractory by adding dolomite or the like has recently been developed. Since refining is started, the content of free calcium oxide tends to increase, and there is a problem that expansion and collapse easily occur. In the present invention, the steelmaking slag is immersed in a sulfuric acid solution or the like, and the main component CaO (free)
CaO, 2CaO · SiO 2 , 3CaO · SiO 2 , 2
It is an object of the present invention to provide a technique for producing CaSO 4 .2H 2 O (gypsum) by reacting CaO components in minerals such as CaO · Fe 2 O 3 and the like. all regardless of CaSO 4 · 2
Since it becomes H 2 O, not only does the conventional problem of suppressing reuse by expansion and collapse disappear, but the more CaO, the more Ca
The amount of SO 4 .2H 2 O produced will also increase.
【０００６】[0006]
【課題を解決するための手段】本発明は、鉄鋼スラグを
硫酸溶液中に浸漬等の方法によって反応させて石膏を生
成させた後、硫酸溶液と分離、水洗乾燥して石膏粉末を
得ることを特徴とする鉄鋼スラグの改質方法である。According to the present invention, gypsum is obtained by reacting iron and steel slag in a sulfuric acid solution by a method such as immersion to form gypsum, and then separating the sulfuric acid solution, washing with water and drying. It is a characteristic method for modifying steel slag.
【０００７】[0007]
【作用】本発明の鉄鋼スラグの改質方法では、鉄鋼スラ
グとして高炉スラグ、製鋼スラグ、電気炉スラグ等を利
用することができる。特にＣａＯ成分が多いほど、石膏
生成量が多く、また石膏の純度も高くなる。このため、
ＣａＯ成分の多い製鋼スラグは好適である。In the method for modifying iron and steel slag of the present invention, blast furnace slag, steelmaking slag, electric furnace slag and the like can be used as the iron and steel slag. In particular, the more the CaO component is, the more the gypsum is produced, and the higher the purity of the gypsum is. For this reason,
Steelmaking slag containing a large amount of CaO is suitable.
【０００８】製鋼スラグの中にはＣａＯ、２ＣａＯ・Ｓ
ｉＯ2 が多量に含有され、これと硫酸との反応が以下の
ようになると推定される。 ＣａＯ＋Ｈ2 ＳＯ4 ＋Ｈ2 Ｏ → ＣａＳＯ4 ・２Ｈ2
Ｏ ２ＣａＯ・ＳｉＯ2 ＋２Ｈ2 ＳＯ4 ＋２Ｈ2 Ｏ→ ２Ｃ
ａＳＯ4 ・２Ｈ2 Ｏ＋２ＳｉＯ2 生成する石膏は白色粉末として生成する。ＳｉＯ2 はゾ
ル状物として生成する。生成したＳｉＯ2 を分離するこ
とで石膏が得られる。CaO, 2CaO ・ S are contained in the steelmaking slag.
It is presumed that a large amount of iO 2 is contained and the reaction between this and sulfuric acid is as follows. CaO + H 2 SO 4 + H 2 O → CaSO 4・ 2H 2
O 2 CaO ・ SiO 2 + 2H 2 SO 4 + 2H 2 O → 2C
aSO 4 · 2H 2 O + 2SiO 2 The gypsum produced is produced as a white powder. SiO 2 is produced as a sol. Gypsum is obtained by separating the generated SiO 2 .
【０００９】反応を促進させるために鉄鋼スラグを予め
粉砕し、整粒しておくとよい。粒度は１ｍｍ以下が望ま
しく、また０．５ｍｍ以下が好適である。これは反応が
表面から起こるため、粒径の大きいものでは中心部が未
反応で残る可能性が高くなるためである。反応は、硫酸
水溶液中にスラグを浸漬するかあるいはスラグ粉末を分
散させる等の方法により行う。浸漬する場合は撹拌する
ことによって均一な反応を継続させることができる。ま
た硫酸水溶液との反応は浸漬のほか、硫酸水溶液を噴霧
する等の方法によってもよい。In order to accelerate the reaction, the iron and steel slag is preferably crushed and sized in advance. The particle size is preferably 1 mm or less, and more preferably 0.5 mm or less. This is because the reaction takes place from the surface, so that with a large particle size, there is a high possibility that the central portion will remain unreacted. The reaction is carried out by a method such as immersing the slag in an aqueous sulfuric acid solution or dispersing the slag powder. When soaking, a uniform reaction can be continued by stirring. The reaction with the aqueous sulfuric acid solution may be carried out by dipping or spraying an aqueous sulfuric acid solution.
【００１０】反応に必要な硫酸の量は、浸漬法の場合ス
ラグ中のＣａＯ量が全て反応するに必要なＨ2 ＳＯ4 の
量を１としたとき０．８以上１以下が好ましい。０．８
未満では未反応物が多く残留し、石膏の利用が困難にな
る。１を越えて過剰に加えると、残留Ｈ2 ＳＯ4 の処理
の問題が発生するが、反応自体は問題なく進む。噴霧法
による場合は、硫酸水溶液を循環使用することが可能で
あり、浸漬法のように硫酸量の上限，下限を限定する必
要はない。The amount of sulfuric acid required for the reaction is preferably 0.8 or more and 1 or less when the amount of H 2 SO 4 required for all the CaO amount in the slag to react in the dipping method is 1. 0.8
If it is less than this, a large amount of unreacted material remains, making it difficult to use gypsum. If added in excess of 1, the problem of processing residual H 2 SO 4 occurs, but the reaction itself proceeds without problems. In the case of the spraying method, it is possible to circulate and use the sulfuric acid aqueous solution, and it is not necessary to limit the upper and lower limits of the sulfuric acid amount as in the dipping method.
【００１１】硫酸水溶液の濃度については特に限定する
ものではないが、稀硫酸では反応速度が遅くなる傾向に
ある。好ましくは１規定以上の硫酸水溶液である。反応
温度は、高いほど、反応速度は大きくなる。１０℃以下
では反応が進みにくく、好ましくない。反応後、生成し
た石膏を分離回収する。分離回収方法は特に限定するも
のではないが、例えば次のような方法を利用することが
できる。濾過により石膏は濾滓として、またゾル状Ｓｉ
Ｏ2 及び溶液は濾液中に分離される。The concentration of the aqueous sulfuric acid solution is not particularly limited, but the reaction rate tends to be slow with dilute sulfuric acid. It is preferably a 1 N or more aqueous sulfuric acid solution. The higher the reaction temperature, the higher the reaction rate. If the temperature is 10 ° C or lower, the reaction is difficult to proceed, which is not preferable. After the reaction, the produced gypsum is separated and collected. The separation and recovery method is not particularly limited, but the following method can be used, for example. Gypsum as a slag by filtration and sol-like Si
O 2 and the solution are separated in the filtrate.
【００１２】分離された石膏粉末は洗浄後、乾燥する。
洗浄は十分に行うべきである。不十分だとＨ2 ＳＯ4 が
残留し好ましくない。乾燥方法は特に限定されない。石
膏は加熱温度条件によっては脱水することがあり、製品
によって乾燥温度が異なる。もし２水石膏を得ようとし
たら４５℃以上では脱水するため、好ましくない。一
方、半水石膏を得ようとしたら４５℃以上で乾燥する必
要がある。The separated gypsum powder is washed and then dried.
Washing should be thorough. If it is insufficient, H 2 SO 4 remains, which is not preferable. The drying method is not particularly limited. Gypsum may be dehydrated depending on the heating temperature conditions, and the drying temperature varies depending on the product. If you try to obtain gypsum dihydrate, it dehydrates at 45 ° C or higher, which is not preferable. On the other hand, to obtain hemihydrate gypsum, it is necessary to dry it at 45 ° C. or higher.
【００１３】[0013]
［実施例１］現場より採取した塩基度（ＣａＯ／ＳｉＯ
2 ）５の転炉スラグの化学組成（ｗｔ％）を表１に示
す。この転炉スラグを５００μｍアンダーに粉砕・整粒
し、スラグ粒子２００ｇを準備した。また、硫酸は１０
Ｎになるように濃度調整し１５００ｃｃ準備した。実験
フローを図１に示す。硫酸をウォーターバスにて８０℃
に温調した後、テフロン撹拌子により撹拌しながらスラ
グ粒子を投入し撹拌を３時間継続した。硫酸溶液は緑白
色となった。アスピレータにより吸引濾過を行った。濾
過は数分程度で終了し、濾液は淡い緑色となり、濾過物
として白色粉末が得られた。この粉末を水洗後、乾燥機
を用いて４０℃で７２時間乾燥後、Ｘ線回折と化学定量
分析を行った。その結果、Ｘ線回折ではピークは全てＣ
ａＳＯ4 ・２Ｈ2 Ｏであり、石膏が生成していることが
わかった。また、化学定量分析の結果、ＣａＳＯ4 ・２
Ｈ2 Ｏ成分が９５．２ｗｔ％、ＳｉＯ2 成分が２．８ｗ
ｔ％で、他成分の合計は２．０ｗｔ％であった。得られ
た石膏粉末は平均粒径約８．２μｍであった。[Example 1] Basicity (CaO / SiO2) collected from the site
2 ) Table 1 shows the chemical composition (wt%) of the converter slag of No. 5). This converter slag was crushed and sized to 500 μm under to prepare 200 g of slag particles. Also, sulfuric acid is 10
The concentration was adjusted so as to be N, and 1500 cc was prepared. The experimental flow is shown in FIG. Sulfuric acid in water bath at 80 ℃
After the temperature was adjusted to 1, the slag particles were added while stirring with a Teflon stirrer, and stirring was continued for 3 hours. The sulfuric acid solution turned greenish white. Suction filtration was performed with an aspirator. Filtration was completed in about several minutes, the filtrate became pale green, and a white powder was obtained as a filtered product. This powder was washed with water, dried at 40 ° C. for 72 hours using a dryer, and then subjected to X-ray diffraction and chemical quantitative analysis. As a result, all peaks are C in X-ray diffraction.
It was aSO 4 .2H 2 O, and it was found that gypsum was produced. As a result of chemical quantitative analysis, CaSO 4 · 2
H 2 O component is 95.2 wt%, SiO 2 component is 2.8 w
At t%, the total of other components was 2.0 wt%. The gypsum powder obtained had an average particle size of about 8.2 μm.
【００１４】［実施例２］現場より採取した塩基度約
３．５の転炉スラグの化学組成（ｗｔ％）を表２に示
す。この転炉スラグを実施例１と全く同じ条件で実験を
行った。その結果、実施例１と同様な白色粉末を得るこ
とができ、同様にＸ線回折、化学定量分析を行った。そ
の結果、Ｘ線回折のピークは全てＣａＳＯ4 ・２Ｈ2 Ｏ
であり、石膏が生成していることがわかったまた、化学
定量分析の結果、ＣａＳＯ4 ・２Ｈ2 Ｏ成分が９４．３
ｗｔ％、ＳｉＯ2 成分が３．６ｗｔ％で、他成分の合計
は２．１ｗｔ％であった。得られた石膏粉末は平均粒径
約９．２μｍであった。Example 2 Table 2 shows the chemical composition (wt%) of a converter slag having a basicity of about 3.5, which was collected from the site. This converter slag was tested under exactly the same conditions as in Example 1. As a result, a white powder similar to that in Example 1 could be obtained, and similarly subjected to X-ray diffraction and chemical quantitative analysis. As a result, all X-ray diffraction peaks were CaSO 4 .2H 2 O.
It was found that gypsum was produced. As a result of the chemical quantitative analysis, the CaSO 4 .2H 2 O component was 94.3.
wt%, SiO 2 component was 3.6 wt%, and the total of other components was 2.1 wt%. The gypsum powder obtained had an average particle size of about 9.2 μm.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【発明の効果】本発明により、製鋼スラグを硫酸と反応
させることにより、スラグの主成分であるＣａＯをＣａ
ＳＯ4 ・２Ｈ2 Ｏに改質することができ、純度９０％以
上の石膏粉末が得られた。この改質反応は、塩基度に関
係なくＣａＯをＣａＳＯ4 ・２Ｈ2 Ｏに改質できること
から、従来のように遊離酸化カルシウムのために再利用
が抑制されることもなく、むしろ高塩基度の方が石膏生
産量が増加する。従って、製鋼スラグの再利用率を顕著
に向上できる。また、本発明の改質反応は、製鋼スラグ
のみならずＣａＯ成分が含まれる全ての鉄鋼スラグ、例
えば、高炉スラグやステンレススラグ等へも適用でき
る。According to the present invention, by reacting steelmaking slag with sulfuric acid, CaO, which is the main component of the slag, is reduced to Ca.
Gypsum powder having a purity of 90% or more was obtained which could be modified to SO 4 .2H 2 O. In this reforming reaction, CaO can be reformed to CaSO 4 .2H 2 O regardless of the basicity, so that the reuse is not suppressed due to the free calcium oxide as in the conventional case, but rather the high basicity is achieved. The gypsum production will increase. Therefore, the reuse rate of the steelmaking slag can be significantly improved. Further, the reforming reaction of the present invention can be applied not only to steelmaking slag but also to all steel slags containing CaO components, such as blast furnace slag and stainless slag.
【００１８】本発明の改質プロセスにおけるスラグ粒
度、硫酸濃度、温度スラグと硫酸の接触のさせ方等の改
質条件は特に限定されるものではなく、石膏に改質でき
る範囲で制御すればよい。In the reforming process of the present invention, the reforming conditions such as the slag particle size, the sulfuric acid concentration, and the method of contacting the temperature slag with sulfuric acid are not particularly limited, and may be controlled within the range that can be reformed to gypsum. .
【図１】実施例の実験フローシートである。FIG. 1 is an experimental flow sheet of an example.
Claims (1)
を生成させた後、硫酸溶液と分離、乾燥して石膏粉末を
得ることを特徴とする鉄鋼スラグの改質方法。1. A method for reforming steel slag, which comprises reacting steel slag with a sulfuric acid solution to produce gypsum, separating the gypsum from the sulfuric acid solution and drying the gypsum powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5324701A JPH07172882A (en) | 1993-12-22 | 1993-12-22 | Method for reforming steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5324701A JPH07172882A (en) | 1993-12-22 | 1993-12-22 | Method for reforming steel slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07172882A true JPH07172882A (en) | 1995-07-11 |
Family
ID=18168754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5324701A Pending JPH07172882A (en) | 1993-12-22 | 1993-12-22 | Method for reforming steel slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07172882A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016199789A (en) * | 2015-04-10 | 2016-12-01 | 新日鐵住金株式会社 | Acid treatment method for steel slag |
| KR20210073082A (en) * | 2019-12-10 | 2021-06-18 | 주식회사 포스코 | Neutralized gypsum composition for cement, method for producing the neutralized gypsum for cement, and cement comprising the neutralized gypsum |
-
1993
- 1993-12-22 JP JP5324701A patent/JPH07172882A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016199789A (en) * | 2015-04-10 | 2016-12-01 | 新日鐵住金株式会社 | Acid treatment method for steel slag |
| KR20210073082A (en) * | 2019-12-10 | 2021-06-18 | 주식회사 포스코 | Neutralized gypsum composition for cement, method for producing the neutralized gypsum for cement, and cement comprising the neutralized gypsum |
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