JP6453716B2 - Fluorine insolubilizer for steel slag - Google Patents
Fluorine insolubilizer for steel slag Download PDFInfo
- Publication number
- JP6453716B2 JP6453716B2 JP2015117259A JP2015117259A JP6453716B2 JP 6453716 B2 JP6453716 B2 JP 6453716B2 JP 2015117259 A JP2015117259 A JP 2015117259A JP 2015117259 A JP2015117259 A JP 2015117259A JP 6453716 B2 JP6453716 B2 JP 6453716B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorine
- gypsum
- mass
- steel slag
- insolubilizing agent
- 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.)
- Active
Links
Landscapes
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
本発明は鉄鋼スラグ用フッ素不溶化剤に関する。環境保全の観点から、フッ素不溶化剤を用いて、鉄鋼スラグからのフッ素の溶出量を低減することが行なわれる。本発明は、かかる鉄鋼スラグ用フッ素不溶化剤の改良に関する。 The present invention relates to a fluorine insolubilizing agent for steel slag. From the viewpoint of environmental conservation, a fluorine insolubilizing agent is used to reduce the amount of fluorine eluted from steel slag. The present invention relates to an improvement of such a fluorine insolubilizing agent for steel slag.
従来、前記のような鉄鋼スラグ用フッ素不溶化剤として、カルシウムシリケート系を主体とするＡＯＤ還元期スラグを用いる例（特許文献１参照）、非酸化物系カルシウム化合物とフライアッシュを用いる例（特許文献２参照）、固体状リン酸アルカリ（土類）金属塩を酸性溶液に溶解させたものを用いる例（特許文献３参照）、製鋼スラグの塩基度（ＣａＯ／ＳｉＯ２）を２．０以下とする例（特許文献４参照）、酸化マグネシウム組成物を用いる例（特許文献５参照）等、各種が知られている。しかし、これら従来の鉄鋼スラグ用フッ素不溶化剤には、もともと鉄鋼スラグからのフッ素の溶出量を低減することが不充分であったり、また鉄鋼スラグからのフッ素の溶出量を低減することに時間がかかるという問題がある。 Conventionally, as a fluorine insolubilizing agent for steel slag as described above, an example using an AOD reducing phase slag mainly composed of a calcium silicate system (see Patent Document 1), an example using a non-oxide calcium compound and fly ash (Patent Document) 2), an example using a solid alkali phosphate (earth) metal salt dissolved in an acidic solution (see Patent Document 3), and the basicity (CaO / SiO 2 ) of steelmaking slag is 2.0 or less. Various examples are known, such as an example (see Patent Document 4) and an example using a magnesium oxide composition (see Patent Document 5). However, these conventional fluorine insolubilizers for steel slag are originally insufficient to reduce the amount of fluorine eluted from steel slag, and it is time to reduce the amount of fluorine eluted from steel slag. There is a problem that it takes.
本発明が解決しようとする課題は、鉄鋼スラグからのフッ素の溶出量を短時間で且つ充分に低減することができる鉄鋼スラグ用フッ素不溶化剤を提供する処にある。 The problem to be solved by the present invention is to provide a fluorine insolubilizing agent for steel slag capable of sufficiently reducing the amount of fluorine eluted from steel slag in a short time.
前記の課題を解決する本発明は、リン化合物を２０〜９０質量％及び石膏を１０〜８０質量％（合計１００質量％）の割合で含有して成ることを特徴とする鉄鋼スラグ用フッ素不溶化剤に係る。 The present invention for solving the above-mentioned problems comprises a fluorine insolubilizing agent for steel slag characterized by comprising a phosphorus compound in an amount of 20 to 90% by mass and gypsum in a proportion of 10 to 80% by mass (total 100% by mass). Concerning.
本発明に係る鉄鋼スラグ用フッ素不溶化剤（以下、本発明のフッ素不溶化剤という）は、路盤材、コンクリート用骨材、土壌改良材等として利用される高炉スラグや製鋼スラグのような鉄鋼スラグからのフッ素の溶出量を低減するために用いるものである。なかでも、本発明に係るフッ素不溶化剤は、製鋼スラグからのフッ素の溶出量を低減する場合に効果の発現が高い。 The fluorine insolubilizing agent for steel slag according to the present invention (hereinafter referred to as the fluorine insolubilizing agent of the present invention) is from steel slag such as blast furnace slag and steelmaking slag used as roadbed material, concrete aggregate, soil improvement material and the like. It is used to reduce the elution amount of fluorine. Among these, the fluorine insolubilizing agent according to the present invention is highly effective in reducing the amount of fluorine eluted from steelmaking slag.
本発明のフッ素不溶化剤はリン化合物と石膏を含有して成るものであるが、リン化合物を２０〜９０質量％、石膏を１０〜８０質量％（合計１００質量％）の割合で含有して成るものであり、好ましくはリン化合物を３０〜７０質量％、石膏を３０〜７０質量％（合計１００質量％）の割合で含有して成るものであり、より好ましくはリン化合物を３０〜５０質量％、石膏を５０〜７０質量％（合計１００質量％）の割合で含有して成るものである。 The fluorine insolubilizing agent of the present invention comprises a phosphorus compound and gypsum, and comprises a phosphorus compound in a proportion of 20 to 90% by mass and gypsum in a proportion of 10 to 80% by mass (total 100% by mass). Preferably 30 to 70% by mass of phosphorus compound and 30 to 70% by mass (total 100% by mass) of gypsum, more preferably 30 to 50% by mass of phosphorus compound , Gypsum is contained in a proportion of 50 to 70% by mass (total of 100% by mass).
本発明のフッ素不溶化剤は、リン化合物と石膏を含有して成るものである。リン化合物としては、リン酸塩、リン酸二水素塩、リン酸一水素塩、メタリン酸塩等が挙げられ、この場合の塩としては、アルカリ金属塩、アルカリ土類金属塩、アンモニウム塩等が挙げられるが、リン酸水素カルシウム二水和物（ＣａＨＰＯ４・２Ｈ２Ｏ、以下ＤＣＰＤという）が好ましく、ＤＣＰＤと水酸化アパタイト（以下、ＨＡＰという）との混合物がより好ましい。リン化合物としてＤＣＰＤとＨＡＰとの混合物を用いる場合、双方の割合は、ＤＣＰＤ／ＨＡＰ＝６０／４０〜９５／５（質量比）とすることが好ましく、ＤＣＰＤ／ＨＡＰ＝８０／２０〜９０／１０（質量比）とすることがより好ましい。 The fluorine insolubilizing agent of the present invention comprises a phosphorus compound and gypsum. Examples of phosphorus compounds include phosphates, dihydrogen phosphates, monohydrogen phosphates, metaphosphates, etc. In this case, examples of salts include alkali metal salts, alkaline earth metal salts, ammonium salts, and the like. Among them, calcium hydrogen phosphate dihydrate (CaHPO 4 .2H 2 O, hereinafter referred to as DCPD) is preferable, and a mixture of DCPD and hydroxide apatite (hereinafter referred to as HAP) is more preferable. When a mixture of DCPD and HAP is used as the phosphorus compound, the ratio of both is preferably DCPD / HAP = 60/40 to 95/5 (mass ratio), and DCPD / HAP = 80/20 to 90/10. (Mass ratio) is more preferable.
本発明のフッ素不溶化剤において、ＤＣＰＤとしては、工業用の他に、化粧品用、食品添加物用、医薬品用等、各種のグレードのものが市販されているので、それらを使用することができるが、別に製造したものを使用することもできる。ＤＣＰＤは、工業的には一般に、消石灰の水分散液とリン酸とを、ｐＨ４〜５に調整した水系媒体中で反応させることにより製造され、かかる反応に際して各種の添加剤を用いる方法も知られているので（特開昭６３−２１５５０５号公報、特開平６−１９１８０８号公報、特開平６−２９８５０５号公報、特開平７−２５０４号公報、特開平７−１０５１１号公報、特開平８−１６５１０８号公報等）、これらの従来法により製造したものを使用することもできる。 In the fluorine insolubilizing agent of the present invention, as DCPD, various grades such as cosmetics, food additives, and pharmaceuticals are commercially available in addition to industrial use. Separately manufactured products can also be used. In general, DCPD is produced by reacting an aqueous dispersion of slaked lime with phosphoric acid in an aqueous medium adjusted to pH 4 to 5, and methods using various additives in such reactions are also known. (JP-A 63-215505, JP-A 6-191808, JP-A 6-298505, JP-A 7-2504, JP-A 7-10511, JP 8-165108). Etc.) and those produced by these conventional methods can also be used.
また本発明のフッ素不溶化剤において、ＨＡＰとしては、これも天然由来のものや化学的に合成したもの等、各種のグレードのものが市販されているので、それらを使用することができるが、別に製造したものを使用することもできる。ＨＡＰは、工業的には一般に、カルシウム塩の水溶液、例えば硝酸カルシウムの水溶液とリン酸の水溶液とを混合し、ｐＨを８〜９程度に調整することにより製造されているので、かかる従来法により製造したものを使用することもできる。 Further, in the fluorine insolubilizing agent of the present invention, as HAP, various grades such as naturally derived ones and chemically synthesized ones are commercially available. What was manufactured can also be used. In general, HAP is manufactured by mixing an aqueous solution of calcium salt, for example, an aqueous solution of calcium nitrate and an aqueous solution of phosphoric acid, and adjusting the pH to about 8-9. What was manufactured can also be used.
本発明のフッ素不溶化剤において、ＤＣＰＤは結晶質のものであるが、ＨＡＰには結晶質のものと非晶質のものとがある。かかる結晶性については、Ｘ線回析（ＸＲＤ）、走査型電子顕微鏡観察（ＳＥＭ観察）等により確認することができる。本発明のフッ素不溶化剤において、ＨＡＰとしては、非晶質のものが好ましい。結晶質のＨＡＰを使用する場合よりも高性能のフッ素不溶化剤となるからである。 In the fluorine insolubilizing agent of the present invention, DCPD is crystalline, while HAP is crystalline and amorphous. Such crystallinity can be confirmed by X-ray diffraction (XRD), scanning electron microscope observation (SEM observation), and the like. In the fluorine insolubilizing agent of the present invention, the HAP is preferably amorphous. This is because the fluorine insolubilizing agent has a higher performance than when crystalline HAP is used.
更に本発明のフッ素不溶化剤において、石膏としては、半水石膏、二水石膏、無水石膏、これらの混合物等を使用することができるが、使用上の便宜及び経済性の点で半水石膏及び／又は二水石膏が好ましく、加えて効果の発現の点で、半水石膏がより好ましい。尚、この場合の半水石膏や二水石膏には、石膏ボード等の廃材である廃石膏から製造されるものも含まれる。 Furthermore, in the fluorine insolubilizing agent of the present invention, as the gypsum, hemihydrate gypsum, dihydrate gypsum, anhydrous gypsum, a mixture thereof, and the like can be used. Dihydrate gypsum is preferable, and hemihydrate gypsum is more preferable in terms of expression of the effect. In this case, the hemihydrate gypsum and dihydrate gypsum include those produced from waste gypsum which is a waste material such as gypsum board.
前記の石膏に代えて、他のカルシウム化合物、例えば炭酸カルシウム、消石灰、生石灰等を使用することも考えられるが、これらでは、石膏を使用する場合のような効果は得られない。 In place of the above-mentioned gypsum, other calcium compounds such as calcium carbonate, slaked lime, and quick lime may be used, but these do not provide the same effect as when gypsum is used.
本発明のフッ素不溶化剤は、例えば市販のＤＣＰＤと市販のＨＡＰと市販の半水石膏及び／又は廃石膏とを前記したような特定の割合で混合することにより製造することができるが、消石灰（Ｃａ（ＯＨ）２）とリン酸（Ｈ３ＰＯ４）とを水系媒体中にて反応させ、その反応生成物に廃石膏を混合することにより製造することもできる。 The fluorine insolubilizing agent of the present invention can be produced, for example, by mixing commercially available DCPD, commercially available HAP, and commercially available hemihydrate gypsum and / or waste gypsum at a specific ratio as described above. It can also be produced by reacting Ca (OH) 2 ) and phosphoric acid (H 3 PO 4 ) in an aqueous medium, and mixing waste gypsum with the reaction product.
鉄鋼スラグからのフッ素の溶出量を低減するため、鉄鋼スラグに本発明のフッ素不溶化剤を用いる方法としては、鉄鋼スラグを得るときの水砕処理時に本発明のフッ素不溶化剤を加える方法、本発明のフッ素不溶化剤を加えておいた空冷パンに製鋼スラグを受けて空冷する方法、鉄鋼スラグの粉砕物に本発明のフッ素不溶化剤を加えて混合する方法等が挙げられる。鉄鋼スラグに対する本発明にフッ素不溶化剤の使用量は、鉄鋼スラグの性状や物性、フッ素含有量等にもよるが、通常は０．５〜５質量％となる量である。 In order to reduce the elution amount of fluorine from steel slag, the method of using the fluorine insolubilizing agent of the present invention in steel slag includes the method of adding the fluorine insolubilizing agent of the present invention at the time of water granulation treatment when obtaining steel slag, the present invention Examples include a method in which steelmaking slag is received in an air-cooled pan in which the fluorine insolubilizing agent is added and air-cooled, and a method in which the fluorine insolubilizing agent of the present invention is added to a pulverized steel slag and mixed. The amount of the fluorine insolubilizing agent used in the present invention for steel slag is usually 0.5 to 5% by mass, although it depends on the properties and physical properties of the steel slag and the fluorine content.
本発明のフッ素不溶化剤によると、鉄鋼スラグからのフッ素の溶出量を短時間で且つ充分に低減することができる。 According to the fluorine insolubilizing agent of the present invention, the amount of fluorine eluted from steel slag can be sufficiently reduced in a short time.
以下、本発明の構成及び効果をより具体的にするため実施例等を挙げるが、本発明がこれらの実施例に限定されるというものではない。尚、以下の実施例等で、％は質量％であり、部は質量部である。 Hereinafter, examples and the like will be given to make the configuration and effects of the present invention more specific, but the present invention is not limited to these examples. In the following Examples and the like,% is% by mass, and parts are parts by mass.
試験区分１
表１に記載した金属組成の製鋼スラグＡを処理対象とした。製鋼スラグＡは電気炉系スラグであり、電気炉から排出された溶融スラグをパンに受けて散水しつつ徐冷した後、破砕し、粉砕して、１００ｍｍ目の篩を通した粉砕物である。表１に記載したかかる粉砕物の金属組成は、蛍光Ｘ線分析値から計算により求めた。
Test category 1
Steelmaking slag A having a metal composition described in Table 1 was used as a treatment target. Steelmaking slag A is an electric furnace system slag, which is a pulverized product obtained by passing the molten slag discharged from the electric furnace into a pan, slowly cooling it while sprinkling water, crushing, pulverizing, and passing through a 100 mm sieve. . The metal composition of the pulverized product described in Table 1 was obtained by calculation from the fluorescent X-ray analysis value.
前記の製鋼スラグＡを５０ｇに、表２に記載した組成のフッ素不溶化剤と、純水５００ｍＬとを加えて、毎分２００回で６時間振とうし、１０分間静置した後、上澄液を濾過して溶出液を得た。この溶出液中のフッ素濃度（ｍｇ／Ｌ）をイオン選択性電極で測定して求めた。結果を表２にまとめて示した。尚、フッ素不溶化剤は、予めＤＣＰＤとＨＡＰを混合しておいたもの（比較例２〜５）、半水石膏のみ（比較例６〜９）、予めＤＣＰＤと半水石膏を混合しておいたもの（実施例１〜４）、又は予めＤＣＰＤとＨＡＰと半水石膏を混合しておいたもの（実施例５〜８）を用いた。また比較例１は、フッ素不溶化剤を用いていない例（ブランク）である。
50 g of the steelmaking slag A is added with a fluorine insolubilizer having the composition described in Table 2 and 500 mL of pure water, shaken at 200 times per minute for 6 hours, allowed to stand for 10 minutes, Was filtered to obtain an eluate. The fluorine concentration (mg / L) in the eluate was determined by measuring with an ion selective electrode. The results are summarized in Table 2. In addition, the fluorine insolubilizer was previously mixed with DCPD and HAP (Comparative Examples 2 to 5), only hemihydrate gypsum (Comparative Examples 6 to 9), and DCPD and hemihydrate gypsum were previously mixed (Examples 1 to 4) or DCPD, HAP and hemihydrate gypsum previously mixed (Examples 5 to 8) were used. Moreover, the comparative example 1 is an example (blank) which does not use the fluorine insolubilizing agent.
表２において、
ＤＣＰＤ＋ＨＡＰ：ＤＣＰＤ／ＨＡＰ＝９０／１０（質量比）の混合物
ＤＣＰＤ＋半水石膏：ＤＣＰＤ／半水石膏＝９０／１０（質量比）の混合物
ＤＣＰＤ＋ＨＡＰ＋半水石膏：ＤＣＰＤ／ＨＡＰ＝９０／１０（質量比）の混合物４０部と半水石膏６０部の割合の混合物
フッ素不溶化剤の添加量（％）：製鋼スラグＡに対するフッ素不溶化剤の添加割合（質量％）
以上は試験区分２の表４においても同じ
In Table 2,
DCPD + HAP: DCPD / HAP = 90/10 (mass ratio) mixture DCPD + half-water gypsum: DCPD / half-water gypsum = 90/10 (mass ratio) DCPD + HAP + half-water gypsum: DCPD / HAP = 90/10 (mass ratio) ) Mixture of 40 parts and 60 parts of hemihydrate gypsum Fluorine insolubilizer added (%): Fluorine insolubilizer added to steelmaking slag A (mass%)
The same applies to Table 4 of Test Category 2.
試験区分２
表３に記載した金属組成の製鋼スラグＢを処理対象とした。製鋼スラグＢは電気炉系スラグであり、電気炉から排出された溶融スラグをパンに受けて空冷した後、破砕し、粉砕して、１００ｍｍ目の篩を通した粉砕物である。表３に記載したかかる粉砕物の金属組成は、蛍光Ｘ線分析値から計算により求めた。
Test category 2
Steelmaking slag B having a metal composition described in Table 3 was treated. Steelmaking slag B is an electric furnace slag, which is a pulverized product obtained by receiving molten slag discharged from the electric furnace in a pan, air-cooling, crushing, pulverizing, and passing through a 100-mm sieve. The metal composition of the pulverized product described in Table 3 was obtained by calculation from the fluorescent X-ray analysis value.
前記の製鋼スラグＢを５０ｇに、表４に記載した組成のフッ素不溶化剤と、純水５００ｍＬとを加えて、毎分２００回で６時間振とうし、１０分間静置した後、上澄液を濾過して溶出液を得た。この溶出液中のフッ素濃度（ｍｇ／Ｌ）をイオン選択性電極で測定して求めた。結果を表４にまとめて示した。尚、フッ素不溶化剤は、試験区分１の場合と同様である。また比較例１０は、フッ素不溶化剤を用いていない例（ブランク）である。 50 g of the steelmaking slag B is added with a fluorine insolubilizer having the composition shown in Table 4 and 500 mL of pure water, shaken at 200 times per minute for 6 hours, allowed to stand for 10 minutes, Was filtered to obtain an eluate. The fluorine concentration (mg / L) in the eluate was determined by measuring with an ion selective electrode. The results are summarized in Table 4. The fluorine insolubilizing agent is the same as in the case of test category 1. Moreover, the comparative example 10 is an example (blank) which does not use the fluorine insolubilizing agent.
表２及び表４の結果からも明らかなように、本発明によると、鉄鋼スラグからのフッ素の溶出量を短時間で且つ充分に低減することができる。 As is apparent from the results of Tables 2 and 4, according to the present invention, the amount of fluorine eluted from the steel slag can be sufficiently reduced in a short time.
Claims (5)
前記リン化合物がリン酸水素カルシウム二水和物である鉄鋼スラグ用フッ素不溶化剤。 Comprising a proportion of the phosphorus compound 20-90 wt% and 10-80 wt% gypsum (total 100 wt%) is,
A fluorine insolubilizing agent for steel slag, wherein the phosphorus compound is calcium hydrogen phosphate dihydrate .
前記リン化合物がリン酸水素カルシウム二水和物と水酸化アパタイトである鉄鋼スラグ用フッ素不溶化剤。A fluorine insolubilizing agent for steel slag, wherein the phosphorus compound is calcium hydrogen phosphate dihydrate and hydroxide apatite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015117259A JP6453716B2 (en) | 2015-06-10 | 2015-06-10 | Fluorine insolubilizer for steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015117259A JP6453716B2 (en) | 2015-06-10 | 2015-06-10 | Fluorine insolubilizer for steel slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2017001909A JP2017001909A (en) | 2017-01-05 |
| JP6453716B2 true JP6453716B2 (en) | 2019-01-16 |
Family
ID=57753825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2015117259A Active JP6453716B2 (en) | 2015-06-10 | 2015-06-10 | Fluorine insolubilizer for steel slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6453716B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7315160B2 (en) * | 2019-02-19 | 2023-07-26 | 独立行政法人国立高等専門学校機構 | Fluorine insolubilizer, method for producing same, treated gypsum, method for treating fluorine-containing contaminated soil and contaminated water |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005239509A (en) * | 2004-02-27 | 2005-09-08 | Nippon Steel & Sumikin Stainless Steel Corp | Method for controlling elution of fluorine from steel slag and underground burying material |
| JP2008086911A (en) * | 2006-10-02 | 2008-04-17 | Kurita Water Ind Ltd | Civil engineering material and its manufacturing method |
-
2015
- 2015-06-10 JP JP2015117259A patent/JP6453716B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017001909A (en) | 2017-01-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4548835B2 (en) | New potassium phosphate compound fertilizer | |
| US10125317B2 (en) | Insolubilizing material for specific hazardous substance and method for insolubilizing specific hazardous substance with same | |
| JP2010131517A (en) | Insolubilizing agent | |
| JP5359955B2 (en) | How to prevent elution of heavy metals | |
| JP4818092B2 (en) | Method for suppressing elution of fluorine in steelmaking slag | |
| JP2007308322A (en) | Method of manufacturing fertilizer using waste, and fertilizer | |
| CN107709267A (en) | Fast hard material, its manufacture method and the fast hydraulic cement composition using the fast hard material | |
| JP2018158306A (en) | Solidification insolubilization body, and solidification insolubilization method | |
| JP6453716B2 (en) | Fluorine insolubilizer for steel slag | |
| JP2007246296A (en) | Fly ash-based fertilizer and vegetation improving method by fly ash-based fertilizer | |
| JP7120847B2 (en) | Soil solidification treatment method | |
| JP2011256356A (en) | Fluorine insolubilizer and method for producing the same | |
| JP4074857B2 (en) | Soil solidifying agent | |
| JP7035800B2 (en) | Reducing gypsum and its manufacturing method, cement composition and its manufacturing method, and ground improvement material | |
| JP2018043896A (en) | Silicate fertilizer and production method thereof | |
| JP2012214591A (en) | Method for manufacturing soil hardener using inorganic waste containing fluorine, soil hardener obtained thereby, and method for immobilizing soft soil using the soil hardener | |
| JP6406937B2 (en) | Fluorine insolubilizer | |
| JP7079101B2 (en) | How to make silicic acid fertilizer | |
| JP2003206133A (en) | Gypsum wherein eluted fluorine is reduced | |
| JP4164229B2 (en) | Cement composition | |
| JP2010189238A (en) | Phosphate fertilizer | |
| JP4788721B2 (en) | Insolubilizer and insolubilization method of fluorine in steelmaking slag | |
| JP2021041316A (en) | Insolubilization material of heavy metal or the like and manufacturing method therefor, quality control method of insolubilization material of heavy metal or the like, and insolubilization method of heavy metal or the like | |
| JP6168929B2 (en) | Acid sulfate soil improvement material and improvement method | |
| MacIntire et al. | Calcium Silicate Slags-Properties of Quenched and Unquenched Slags and Effects of Their Admixtures with Phosphatic Fertilizers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20171221 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20180208 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20181005 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20181016 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20181122 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20181211 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20181213 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6453716 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |