JPS5827917A - Treatment of converter slag or the like - Google Patents
Treatment of converter slag or the likeInfo
- Publication number
- JPS5827917A JPS5827917A JP12478881A JP12478881A JPS5827917A JP S5827917 A JPS5827917 A JP S5827917A JP 12478881 A JP12478881 A JP 12478881A JP 12478881 A JP12478881 A JP 12478881A JP S5827917 A JPS5827917 A JP S5827917A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- iron
- reduced
- reducing agent
- converter slag
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は転炉スラグ等の処理方法に係り、詳しくは転炉
その他の製鋼炉から排出されるスラグを粉砕性が向上し
、鉄粉はリン分を含まない状態で単に磁選するのみによ
って、大部分が回収できる転炉スラグ等の処理方法に係
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating converter slag, etc., and more specifically, the slag discharged from converters and other steelmaking furnaces is improved in crushability, and the iron powder is free from phosphorus. The present invention relates to a method for treating converter slag, etc., which can largely be recovered simply by magnetic separation.
一般に、製鉄所から発生する転炉その他の製鋼炉からの
スラグ（以下、単に転炉スラグ等という、Ｊ）は路盤材
などの土建材料や微粉砕して肥料、セメント等の原料等
に一部利用されているが、まだ、大部分は投棄され、利
用度がきわめて低い。Generally, slag from converters and other steelmaking furnaces generated at steel plants (hereinafter simply referred to as converter slag, etc.) is used in civil construction materials such as roadbed materials, and after being pulverized, some of it is used as raw materials for fertilizers, cement, etc. Although it is being used, most of it is still being dumped and its usage is extremely low.
この原因としては、転炉スラグ等は品質のバラツキが大
きいことや、加工費用が高い問題がある。特に肥料、セ
メント等の原料など微粉砕して利用する場合、転炉スラ
グ等は鉄分の含有量が多いために、その粉砕費用が高く
つくので、生産暇、コスト的に問題があった。このため
、転炉スラグ等の微粉砕がもつと容易になれば利用率は
向上する。また、微粉砕された転炉スラグ等は、鉄分の
含有量２５〜１０％程度と非常に多いので、比重が重い
などの問題もある。This is due to the fact that converter slag and the like have large variations in quality and high processing costs. In particular, when pulverizing raw materials such as fertilizers and cement is used, converter slag and the like have a high iron content, so the pulverization costs are high, which poses problems in terms of production time and costs. Therefore, if it becomes easier to pulverize converter slag, etc., the utilization rate will improve. In addition, finely pulverized converter slag and the like have a very high iron content of about 25 to 10%, so there are problems such as high specific gravity.
本発明は上記欠点の解決を目的とし、具体的には従来例
の転炉スラグ等に比べて、微粉砕性が容易でかつ微粉砕
後の転炉スラグ等中の鉄分が少ない転炉スラグ等が製造
でき、かつリン分の少ない鉄分を回収できる転炉スラグ
等の処理方法を提案する。The present invention aims to solve the above-mentioned drawbacks, and specifically focuses on converter slag, etc., which can be easily pulverized and has a lower iron content after pulverization, compared to conventional converter slag, etc. We propose a method for processing converter slag, etc. that can produce iron and recover iron with a low phosphorus content.
すなわち、本発明方法は、転炉スラグ等に、その中に含
まれる酸化鉄の還元に必要な量以下の還元剤を添加して
、溶融状態でこの酸化鉄の少なくとも一部を還元してか
ら、２０ ℃／ｒｎｉｎ以下の冷却速度で除冷し、その
後、粒径０．２５前以下まで粉砕してから、磁選により
鉄分を分所１１することを特徴とする。That is, the method of the present invention involves adding a reducing agent to converter slag or the like in an amount less than the amount necessary for reducing the iron oxide contained therein, reducing at least a portion of this iron oxide in a molten state, and then It is characterized in that it is gradually cooled at a cooling rate of 20° C./rnin or less, then crushed to a particle size of 0.25 or less, and then separated into portions 11 to remove iron by magnetic separation.
以下、本発明方法について詳しく説明する。The method of the present invention will be explained in detail below.
まず、本発明は転炉スラグ等の粉砕性に微粉砕性を向上
させ、スラグ中から鉄粉が効果的に回収でき、その回収
鉄分中にスラグ中からのリン分の移行を少なくおさえる
方法について検討した結果、予めの転炉スラグ等を還元
処理してから微粉砕し、その後、磁選処理することがき
わめて効果的であることを見出し、この知見にもとすい
て成立したものである。従って、本発明方法では、転炉
スラグ等に対し、例えば、１６００℃以下程度の溶融状
態に例えばコークス等の還元剤を添加し、転炉スラグ等
の中の酸化鉄の一部若しくは大部分を還元する１、この
場合、還元された鉄分中のリン分は最小限におさえる必
要があり、還元剤は含まれる酸化鉄の還元剤に必要な掘
を化学暖論的に算出して、その量販下を添加する。First, the present invention describes a method for improving the pulverization properties of converter slag, etc., effectively recovering iron powder from the slag, and minimizing the transfer of phosphorus from the slag into the recovered iron. As a result of investigation, it was found that it is extremely effective to reduce converter slag, etc. in advance, pulverize it, and then subject it to magnetic separation treatment, and based on this knowledge, the invention was established. Therefore, in the method of the present invention, a reducing agent such as coke is added to the converter slag etc. in a molten state at about 1600°C or less, and a part or most of the iron oxide in the converter slag etc. is removed. Reducing 1. In this case, the phosphorus content in the reduced iron must be kept to a minimum, and the amount of reducing agent required for the reducing agent for the contained iron oxide must be calculated chemically, and the amount of phosphorus in the reduced iron must be minimized. Add the bottom.
すなわち、８ｇ１図は転炉スラグの溶融還元処理時の還
元剤添加量と還元後の鉄分中のリン分の関係を示すグラ
フであって、この関係は後記の如く微粉砕して磁選によ
り回収した鉄分、つまり、回収金属鉄のりン磯から求め
たものである。第１図に示すように、転炉スラグ等の中
に含まれている酸化鉄を全量還元するに必要な量以上コ
ークスを添加すると、金属鉄中のリン分は急に高くなる
。この理由は転炉スラグ等の中のＦ ｅ ０１Ｆｅａｒ
３等の酸化鉄の還元速度がＰａ５ｓ等のリン酸物の還元
速度に優先し、還元剤が上記量以内であると、Ｐ２Ｏ５
等までは還元しないからである。In other words, Figure 8g1 is a graph showing the relationship between the amount of reducing agent added during the melt reduction treatment of converter slag and the phosphorus content in the iron after reduction, and this relationship is based on the relationship between the amount of reducing agent added during the melt reduction treatment of converter slag, and the relationship between the amount of phosphorus in the iron content after reduction, and this relationship is based on pulverized slag and recovered by magnetic separation as described below. Iron content, that is, recovered metal iron phosphorus obtained from Iso. As shown in FIG. 1, when coke is added in an amount exceeding the amount required to completely reduce the iron oxide contained in the converter slag, etc., the phosphorus content in the metal iron suddenly increases. The reason for this is that F e 01Fear in converter slag, etc.
The reduction rate of iron oxides such as No. 3 has priority over the reduction rate of phosphates such as Pa5s, and if the reducing agent is within the above amount, P2O5
This is because the amount will not be reduced up to .
次に、還元処理終了後、溶融状態のスラグ２０℃／ｍｉ
ｎ以下の冷却速度で除冷する。この除冷によって、還元
され生成した金属鉄は粒状化し、スラグ中に所謂粒鉄と
して存在する。例えば、第２図はスラグの冷却速度金属
鉄の粒径との関係を示すグラフであって、スラグ中の金
属鉄の粒径はスラグの冷却速度が遅くなるにしたがって
大きくなることがわかる。このように冷却速度が遅くな
るに従って、粒径が大きくなっているのは、冷却過程で
金属鉄同志が（つつき合って粗大化するからであって、
特に、冷却速度が２０℃／ｒｎｉｎ以下のとき粒径は大
きく成長する。Next, after the reduction treatment is completed, the molten slag is heated at 20°C/mi.
Cool slowly at a cooling rate of n or less. By this gradual cooling, the reduced and generated metallic iron is granulated and exists in the slag as so-called granular iron. For example, FIG. 2 is a graph showing the relationship between the cooling rate of slag and the particle size of metallic iron, and it can be seen that the particle size of metallic iron in slag becomes larger as the cooling rate of slag becomes slower. The reason why the grain size becomes larger as the cooling rate becomes slower is because metal iron particles (pecking each other) become coarser during the cooling process.
Particularly, when the cooling rate is 20° C./rnin or less, the grain size grows large.
次に、冷却後のスラグは粒径０２５畷以下まで粉砕し、
金属鉄は粒状化した状態で回収する。Next, the slag after cooling is crushed to a particle size of 025 or less,
Metallic iron is recovered in granular form.
すなわち、第３図は冷却後のスラグをジヨウクラッシャ
ーで６メツシユ以下に粉砕し、その後、磁選したときの
粒度とスラグ中のＴ−Ｆｅ、Ｐ２Ｏ５濃度との関係を示
すグラフである１、第３図に示す如く、粒径０．２５＋
１１＋＋ｌ以下に粉砕したときは、７０％以上の鉄分が
磁選のろにより回収可能であることがわかる。That is, Fig. 3 is a graph showing the relationship between the particle size and the T-Fe and P2O5 concentrations in the slag when the slag after cooling is crushed into 6 meshes or less with a Joe crusher and then subjected to magnetic separation. As shown in the figure, particle size 0.25+
It can be seen that when crushed to 11++l or less, more than 70% of the iron content can be recovered by magnetic separation.
また、このように粉砕する場合１本発明方法の如く、予
め還元処理している場合は粉砕性が向上し、容易に粒径
０．２５ ＋ｒａｎ以下まで微粉砕できる。In addition, when pulverizing in this way, as in the method of the present invention, if reduction treatment is performed in advance, the pulverization properties are improved and the particles can be easily pulverized to a particle size of 0.25+ran or less.
第４図は還元処理を行なった転炉スラグと還元処理を行
なわない転炉スラグとをボール好ルによって粒径６メツ
シユ以下に粉砕した際のプレーン比表面積と粉砕時間と
の関係を示すグラフである。第４図において還元処理さ
れたグラフは符号（イ）、処理されないスラグは符号（
弓で示すが、還元処理したスラグ微粉砕性は、かなりよ
くなっていることがわかる
次に、実施例について説明する。Figure 4 is a graph showing the relationship between plain specific surface area and grinding time when converter slag that has undergone reduction treatment and converter slag that has not undergone reduction treatment are crushed to a particle size of 6 mesh or less using a ball mill. be. In Figure 4, the graph that has been reduced is marked with the symbol (A), and the unprocessed slag is marked with the symbol (A).
As shown by the bow, it can be seen that the pulverization of the slag after the reduction treatment is considerably improved.Examples will now be described.
、 まず、溶融転炉スラグ（１６００℃内外）に対し
て粉コークスを溶融転炉１００重量部に対して２．５％
重量部を添加して還元処理を行なった。その後、溶融ス
ラグを２０ ℃／ｍｉｎ以下の冷却速度で除冷して固化
し、このスラグを粒径０．２５＋ｍ以下に微粉砕し、２
０００ガウスで乾式磁選した。この際、磁選前のスラグ
の組成とともに、磁選後のスラグ部分の組成と回収金属
鉄の組成とを求めたところ、次表に示す通りであった。, First, 2.5% of coke powder was added to 100 parts by weight of molten converter slag (at around 1600°C).
A reduction treatment was carried out by adding parts by weight. Thereafter, the molten slag is gradually cooled and solidified at a cooling rate of 20°C/min or less, and this slag is pulverized to a particle size of 0.25+m or less.
Dry magnetic selection was performed at 0.000 Gauss. At this time, the composition of the slag before magnetic separation, the composition of the slag portion after magnetic separation, and the composition of recovered metal iron were determined, and the results were as shown in the following table.
この結果、次表に示す通り本発明法により処理したスラ
グは微粉状であり、鉄分が少ないため、かなり良質のセ
メント原料及び土質改良剤などとして利用できる。また
、回収した金属鉄は粒鉄であって、リン濃度が低く、高
炉にリターンして鉄源として有効に利用できる。As a result, as shown in the following table, the slag treated by the method of the present invention is in the form of fine powder and has a low iron content, so it can be used as a fairly high-quality cement raw material and soil conditioner. In addition, the recovered metallic iron is granular iron, has a low phosphorus concentration, and can be returned to the blast furnace and effectively used as an iron source.
以上詳しく説明した通り、本発明方法は転炉スラグ等に
その中に含まれる酸化鉄を還元するに必要な量販下の還
元剤を添加し、溶融状態で還元してから除冷し、その後
、微粉砕してから単に磁選により鉄分をスラグ分から分
離するものである。As explained in detail above, the method of the present invention involves adding a commercially available reducing agent necessary to reduce iron oxide contained therein to converter slag, etc., reducing it in a molten state, and then gradually cooling it. After pulverization, the iron content is simply separated from the slag content by magnetic separation.
従って、酸化鉄の還元に必要な量販下しか還元剤が存在
しない状態で還元処理するため、酸化鉄の還元のろが生
じ、％ｌ ｎｏ 、 Ｐ２０５等の還元が生じない。ま
た、還元後に除冷されるため、還元された金属鉄はスラ
グ中で粒状の状態で生成し、微粉砕時にも、予め還元処
理されているため、きわめて容易に微粉砕できる。Therefore, since the reduction treatment is carried out in the presence of only a mass-market reducing agent necessary for the reduction of iron oxide, the reduction of iron oxide is slow and reduction of %l no , P205, etc. does not occur. Further, since it is gradually cooled after reduction, the reduced metal iron is generated in a granular state in the slag, and even when pulverized, it can be pulverized very easily because it has been previously subjected to reduction treatment.
第１図は転炉スラグの溶融還元処理時の還元剤添加葉と
還元後の鉄分中のリン分の関係を示すグラフ、第２図は
スラグの冷却速度金属鉄の粒径との関係を示すグラフ、
第３図は冷却後のスラグをジヨウクラッシャーで６メツ
シユ以下に粉砕し、その後、磁選したときの粒度とスラ
グ中の’ｐ＊ Ｆｅ、 Ｐｇ ０５ 濃度との関係な示
すグラフ、第４図は還元処理を行なった転炉スラグと還
元処理を行なわない転炉スラグをボールζルによって粒
径６メツシユ以下に粉砕した際のブレーン比表面積と粉
砕時間との関係な示すグラフである。
特許用願人 ＩＩＩ ＩＪ製鉄株式会社代理人弁理士松
下義騰
弁理士 鈴 木 均
第１図
第２図
第３図
第４図Figure 1 is a graph showing the relationship between the amount of reducing agent added during melt reduction treatment of converter slag and the phosphorus content in iron after reduction, and Figure 2 shows the relationship between slag cooling rate and particle size of metallic iron. graph,
Figure 3 is a graph showing the relationship between the particle size and 'p* Fe, Pg 05 concentration in the slag when the cooled slag is crushed into 6 meshes or less using a Joe crusher and then subjected to magnetic separation. 2 is a graph showing the relationship between Blaine specific surface area and grinding time when treated converter slag and converter slag not subjected to reduction treatment are ground to a particle size of 6 mesh or less using a ball zeta mill. Patent applicant III IJ Steel Co., Ltd. Patent attorney Yoshito Matsushita Patent attorney Hitoshi Suzuki Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
な量販下の還元剤を添加して溶融状態で、この酸化鉄の
少なくとも一部を還元してから、２０℃／ｍｉｎ以下の
冷却速度で除冷し、その後、粒径０．２５ｍｍ以下まで
粉砕してから、磁選により鉄分を分離することを特徴と
する転炉スラグ等の処理方法。A commercially available reducing agent necessary for reducing the iron oxide contained therein is added to the converter slag, etc. to reduce at least a portion of the iron oxide in the molten state, and then heated at a temperature of 20°C/min or less. A method for treating converter slag, etc., characterized by slowly cooling it at a cooling rate, then crushing it to a particle size of 0.25 mm or less, and then separating the iron content by magnetic separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12478881A JPS5827917A (en) | 1981-08-11 | 1981-08-11 | Treatment of converter slag or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12478881A JPS5827917A (en) | 1981-08-11 | 1981-08-11 | Treatment of converter slag or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5827917A true JPS5827917A (en) | 1983-02-18 |
Family
ID=14894130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12478881A Pending JPS5827917A (en) | 1981-08-11 | 1981-08-11 | Treatment of converter slag or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5827917A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4666591A (en) * | 1984-01-10 | 1987-05-19 | Kawasaki Jukogyo Kabushiki Kaisha | Slag disposal method |
| US6493256B1 (en) | 2001-05-31 | 2002-12-10 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor memory device |
| JP2012001797A (en) * | 2010-06-21 | 2012-01-05 | Jfe Steel Corp | Method for recovering iron and phosphorus from steelmaking slag, and blast-furnace slag fine powder or blast-furnace slag cement, and resource raw material for phosphoric acid |
| JP2012007190A (en) * | 2010-06-22 | 2012-01-12 | Jfe Steel Corp | Method for resource recovery from steelmaking slag, and raw material for phosphate fertilizer |
| JP2012007189A (en) * | 2010-06-22 | 2012-01-12 | Jfe Steel Corp | Method for recovering iron and phosphorus from steelmaking slag, blast furnace slag fine powder or blast furnace slag cement, and phosphate resource raw material |
| JP2012529003A (en) * | 2009-12-30 | 2012-11-15 | ヒュンダイ スチール カンパニー | Method for recovering valuable metals from slag |
| JP2017133074A (en) * | 2016-01-28 | 2017-08-03 | Ｊｆｅスチール株式会社 | Method for screening iron steel slag, method for recycling iron steel slag and method for manufacturing raw material for iron making |
-
1981
- 1981-08-11 JP JP12478881A patent/JPS5827917A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4666591A (en) * | 1984-01-10 | 1987-05-19 | Kawasaki Jukogyo Kabushiki Kaisha | Slag disposal method |
| US6493256B1 (en) | 2001-05-31 | 2002-12-10 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor memory device |
| JP2012529003A (en) * | 2009-12-30 | 2012-11-15 | ヒュンダイ スチール カンパニー | Method for recovering valuable metals from slag |
| JP2012001797A (en) * | 2010-06-21 | 2012-01-05 | Jfe Steel Corp | Method for recovering iron and phosphorus from steelmaking slag, and blast-furnace slag fine powder or blast-furnace slag cement, and resource raw material for phosphoric acid |
| JP2012007190A (en) * | 2010-06-22 | 2012-01-12 | Jfe Steel Corp | Method for resource recovery from steelmaking slag, and raw material for phosphate fertilizer |
| JP2012007189A (en) * | 2010-06-22 | 2012-01-12 | Jfe Steel Corp | Method for recovering iron and phosphorus from steelmaking slag, blast furnace slag fine powder or blast furnace slag cement, and phosphate resource raw material |
| JP2017133074A (en) * | 2016-01-28 | 2017-08-03 | Ｊｆｅスチール株式会社 | Method for screening iron steel slag, method for recycling iron steel slag and method for manufacturing raw material for iron making |
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