JP2018095902A - Pneumatic conveying method and refining method in steel making - Google Patents
Pneumatic conveying method and refining method in steel making Download PDFInfo
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Abstract
【課題】例えば製鋼における精錬剤のように、混合された複数の粉体を気流搬送する場合における詰まりの発生を抑制することである。【解決手段】平均粒径が異なる２種以上の粉体とシリコンオイルを混合して配管にて気流搬送する場合において、最大平均粒径以外の粉体にシリコンオイルを混合した後に、他の粉体を混合して気流搬送する。【選択図】図６PROBLEM TO BE SOLVED: To suppress the occurrence of clogging when a plurality of mixed powders are airflow-conveyed, for example, as a refining agent in steelmaking. SOLUTION: In the case where two or more kinds of powders having different average particle diameters and silicone oil are mixed and air-borne by a pipe, after the silicone oil is mixed with the powder other than the maximum average particle diameter, other powders are used. The body is mixed and airborne. [Selection diagram] Fig. 6
Description
本発明は、気流搬送方法及び製鋼の精錬方法に関するものである。 The present invention relates to an air current conveying method and a steel refining method.
従来から、製鋼の予備処理に使用される炉では、精錬冶金効果を高めるために、窒素をキャリアーガスとして底吹き羽口から粉体の精錬剤を吹き込んでいる。しかしながら、ある頻度で搬送配管内に粉体が詰まり、操業中断に至ることがある。このようなつまりの抑制に関し、特許文献１では、精錬剤に対しシリコンオイルの混合量を０．１〜０．５質量％として粉体輸送する技術の記載があり、一定の効果を挙げている。 Conventionally, in a furnace used for pretreatment of steelmaking, a powder refining agent is blown from a bottom blowing tuyere using nitrogen as a carrier gas in order to enhance a refining metallurgy effect. However, there is a case where powder is clogged in the transfer pipe at a certain frequency, and the operation is interrupted. Regarding the suppression of such clogging, Patent Document 1 describes a technique for transporting powder by setting the mixing amount of silicon oil to 0.1 to 0.5% by mass with respect to the refining agent, and has given a certain effect. .
しかしながら、精錬粉体として用いる粉体が２種類以上ある場合に、シリコンオイルを添加しながらこれらを混合すると、やはり配管詰まりが発生する場合があった。そこで、本発明者らは配管詰まりについて、更なる研究をした。すると、平均粒径の異なる複数の粉体とシリコンオイルを混合するにあたり、単に一定量のシリコンオイルを混合するのではなく、その混合の仕方によって配管詰まりに変化があることを知見した。即ち、混合粉体を気流搬送する場合に、平均粒径が最も大きな粉体以外の粉体とシリコンオイルを混合した後、言い換えれば混合粉体の流動性を支配する小粒径の粉体に流動性を改善できるシリコンオイルを優先的に付着させ、その後残りの平均粒径の大きい粉体を混合することで混合粉体の流動性が向上し、配管詰まりに大きな改善があることを見出した。 However, when there are two or more kinds of powders used as the refined powder, if these are mixed while adding silicon oil, there is a case where clogging of the pipe may occur. Therefore, the present inventors conducted further research on clogging of piping. Then, when mixing a plurality of powders having different average particle diameters and silicon oil, it was found that there is a change in clogging of pipes depending on the mixing method rather than simply mixing a certain amount of silicon oil. That is, when the mixed powder is conveyed by air, after mixing the powder other than the powder having the largest average particle diameter with silicon oil, in other words, the powder having a small particle diameter that governs the fluidity of the mixed powder. We found that the flowability of the mixed powder was improved by preferentially adhering silicon oil that can improve the fluidity, and then mixing the remaining powder with a large average particle diameter, and that there was a significant improvement in clogging of the piping. .
本発明は、このような経緯でなされた発明であり、混合された複数の粉体を気流搬送する場合における詰まりの発生を抑制することである。 The present invention has been made with such circumstances, and is to suppress the occurrence of clogging when a plurality of mixed powders are conveyed by airflow.
上記課題を解決するためになされた本発明は次の手段を採用する。先ず、第一の手段は、平均粒径が異なる２種以上の粉体とシリコンオイルを混合して配管にて気流搬送する場合において、最大平均粒径以外の粉体にシリコンオイルを混合した後に他の粉体を混合して気流搬送することを特徴とする粉体の配管による気流搬送方法である。 The present invention made to solve the above problems employs the following means. First, in the case where two or more kinds of powders having different average particle diameters and silicon oil are mixed and air-flow conveyed by piping, first means after mixing silicon oil with powders other than the maximum average particle diameter It is an airflow conveying method using powder piping, characterized in that another powder is mixed and airborne.
第二の手段は、平均粒径が異なる２種以上の粉体とシリコンオイルを混合して配管にて気流搬送する場合において、平均粒径が最も小さい粉体にシリコンオイルを混合した後に他の粉体を混合して気流搬送することを特徴とする粉体の配管による気流搬送方法である。 The second means is that when two or more kinds of powders having different average particle diameters and silicon oil are mixed and air-flow conveyed by piping, after the silicon oil is mixed with the powder having the smallest average particle diameter, An air flow conveying method using powder piping, wherein powder is mixed and air conveyed.
第三の手段は、複数の脱りん用粉体を用いた製鋼の精錬方法であって、最大平均粒径以外の脱りん用粉体にシリコンオイルを混合した後に他の脱りん用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法である。 The third means is a steel refining method using a plurality of dephosphorization powders, in which silicon oil is mixed with dephosphorization powders other than the maximum average particle size, and then other dephosphorization powders are mixed. It is a steel refining method characterized by mixing and air-conveying by piping.
第四の手段は、複数の脱りん用粉体を用いた製鋼の精錬方法であって、平均粒径が最も小さい脱りん用粉体にシリコンオイルを混合した後に他の脱りん用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法である。 The fourth means is a steel refining method using a plurality of dephosphorization powders, in which silicon oil is mixed with the dephosphorization powder having the smallest average particle diameter and then another dephosphorization powder is added. It is a steel refining method characterized by mixing and air-conveying by piping.
第五の手段は、複数の脱硫用粉体を用いた製鋼の精錬方法であって、最大平均粒径以外の脱硫用粉体にシリコンオイルを混合した後に他の脱硫用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法である。 The fifth means is a steel refining method using a plurality of desulfurization powders, and after mixing silicon oil with desulfurization powder other than the maximum average particle size, other desulfurization powders are mixed, It is a steelmaking refining method characterized by carrying airflow through piping.
第六の手段は、複数の脱硫用粉体を用いた製鋼の精錬方法であって、平均粒径が最も小さい脱硫用粉体にシリコンオイルを混合した後に他の脱硫用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法である。 The sixth means is a steel refining method using a plurality of desulfurization powders, and after mixing silicon oil with desulfurization powder having the smallest average particle size, other desulfurization powders are mixed, It is a steelmaking refining method characterized by carrying airflow through piping.
第一乃至第六の手段を用いると、混合された複数の粉体を気流搬送する場合における詰まりの発生を抑制することができる。 By using the first to sixth means, it is possible to suppress the occurrence of clogging when a plurality of mixed powders are conveyed by airflow.
以下では、発明の実施形態について説明する。本実施形態においては、平均粒径が異なる２種以上の粉体とシリコンオイルを混合して配管にて気流搬送する場合において、最大平均粒径以外の粉体にシリコンオイルを混合した後に他の粉体を混合して気流搬送することにより、粉体の配管による気流搬送において、詰まりの発生を抑制するものである。これは、流動性に支配的でないと考えられる最大平均粒径の粉体に対してシリコンオイルが付着することを回避しやすくなり、より流動性に支配的であると考えられる低粒径の粉体に対してシリコンオイルが付着しやすくなるからであると考えられる。また、平均粒径が最も小さい粉体にシリコンオイルを混合した後に他の粉体を混合して気流搬送することで、流動性に支配的な最も粒径が小さい粉体に対してシリコンオイルが付着しやすくなり、より効果的に配管の詰まりを抑制するものである。次に、脱りんを行う場合と、脱硫を行う場合を代表例として順に説明する。 Hereinafter, embodiments of the invention will be described. In the present embodiment, when two or more kinds of powders having different average particle diameters and silicon oil are mixed and air-flow transported by piping, after the silicon oil is mixed with the powder other than the maximum average particle diameter, By mixing the powder and carrying it in an air current, clogging is prevented from occurring in the air flow through the powder pipe. This makes it easier to avoid the silicone oil from adhering to the powder with the largest average particle diameter that is considered not to be dominant in the fluidity, and the powder with a lower particle diameter that is considered to be more dominant in the fluidity. This is thought to be because silicon oil tends to adhere to the body. In addition, silicon oil is mixed with the powder with the smallest average particle size, and then mixed with other powders and air-conveyed, so that the silicon oil is mixed with the powder with the smallest particle size that is dominant in fluidity. It becomes easy to adhere and suppresses clogging of piping more effectively. Next, a case where dephosphorization is performed and a case where desulfurization is performed will be described in order as representative examples.
図９に示す従来のように、脱りんを行うため、脱りん材であるＣａＯとＣａＣＯ３の混合粉体と、吹練中に発生したダストを混合したものを製鋼の予備処理に使用される炉に吹き込んでいる。図９に示す例においては、脱りん材とシリコンオイルとダストを混ぜ合わせた粉体をホッパで一旦貯留し、必要に応じて、窒素をキャリアーガスとして底吹き羽口から吹き込んでいる。 As in the prior art shown in FIG. 9, in order to perform dephosphorization, a mixture of CaO and CaCO 3 mixed powder, which is a dephosphorization material, and dust generated during blowing is used for pretreatment of steelmaking. Blowing into the furnace. In the example shown in FIG. 9, a powder obtained by mixing a dephosphorizing material, silicon oil and dust is once stored in a hopper, and nitrogen is blown from the bottom blowing tuyere as a carrier gas if necessary.
本実施形態においては、粒径の異なる粉体と液体状のシリコンオイルを備えた精錬剤を形成するに当たり、シリコンオイルと各粉体の混合手順と、粉体の流動性との関係を確認するため、ＣａＯとＣａＣＯ３の混合粉体からなる脱りん材、シリコンオイル及びダストに関し、表１に示すような手順で混合を実施した。ここで図１にＣａＯとＣａＣＯ３の混合粉体の粒径データを示す。また、図２にダストの粒径データを示す。尚、図中のＭＶは体積で重み付けされた体積平均粒径である。シリコンオイルは、デカメチルシクロペンタシロキサンを使用した。図９に示すように、ＣａＯとＣａＣＯ３とダストの重量比は４６：１８：３６としている。 In the present embodiment, in forming a refining agent comprising powder having different particle diameters and liquid silicone oil, the relationship between the mixing procedure of silicone oil and each powder and the fluidity of the powder is confirmed. Therefore, mixing was performed according to the procedure shown in Table 1 with respect to the dephosphorization material, silicon oil and dust made of mixed powder of CaO and CaCO 3 . FIG. 1 shows the particle size data of the mixed powder of CaO and CaCO 3 . FIG. 2 shows dust particle size data. In the figure, MV is a volume average particle diameter weighted by volume. Decamethylcyclopentasiloxane was used as the silicone oil. As shown in FIG. 9, the weight ratio of CaO, CaCO 3 and dust is 46:18:36.
表１中のＡは従来の添加順である。シリコンオイルの添加量を変化させてＡ、Ｂ、Ｃの流動指数の変化をみた。流動指数として、Ｃａｒｒの流動性指数を適用した。Ｃａｒｒの流動性指数の求め方は、概略として粉体の安息角、圧縮度、スパチュラ角、均一度を決められた方法で実際に測定し、それぞれの測定値を指数化して合計値として求めるものである。ここで、安息角などの測定方法を説明する。 A in Table 1 is the conventional order of addition. Changes in the flow index of A, B, and C were observed by changing the amount of silicon oil added. As the flow index, Carr's flowability index was applied. Carr's fluidity index is calculated by measuring the repose angle, compression degree, spatula angle, and uniformity of the powder by a method that has been determined, and indexing each measured value to obtain the total value. It is. Here, a method for measuring the angle of repose will be described.
安息角の測定は、図３に示す器具でなされたものであり、測定は、次の手順により行った。１）ロートに試料を入れる。２）ロートに振動を与えて、試料を落下させる。３）落下してできた試料の山の角度を測定する。４）角度の平均値を求める。 The angle of repose was measured with the instrument shown in FIG. 3, and the measurement was performed according to the following procedure. 1) Put the sample in the funnel. 2) Apply vibration to the funnel to drop the sample. 3) Measure the angle of the crest of the sample that has been dropped. 4) Obtain the average angle.
圧縮度の測定は、図４に示す器具でなされたものであり、圧縮度（Ｃｐ)はゆるめ嵩密度（ρａ）と固めカサ密度（ρｐ）から、次の式を用いて求めた。
Ｃｐ＝（ρｐ−ρａ）／ρｐ×100
The degree of compression was measured with the instrument shown in FIG. 4, and the degree of compression (Cp) was determined from the loose bulk density (ρa) and the hard bulk density (ρp) using the following equation.
Cp = (ρp−ρa) / ρp × 100
ゆるめ嵩密度ρａの測定は、次の手順により行った。１）１６０ｍｍＬの容器に篩をかけながら試料を充填した。ただし試料を圧密しないように充填させている。２）上部から溢れた試料を擦り切った。３）秤量器で重量を測定し密度を求めた。 The loose bulk density ρa was measured according to the following procedure. 1) The sample was filled while sieving a 160 mmL container. However, the sample is filled so as not to be consolidated. 2) The sample overflowing from the upper part was scraped off. 3) The weight was measured with a weigher to determine the density.
固め嵩密度ρｐの測定は、次の手順により行った。１）容器にカバーをつけて試料を多めに充填させた。２）充填後、１８０回タッピングを行った。３）上部から溢れた試料を擦り切った。４）秤量器で重量を測定し密度を求めた。 The measurement of the firm bulk density ρp was performed according to the following procedure. 1) A cover was attached to the container to fill the sample with a large amount. 2) After filling, tapping was performed 180 times. 3) The sample overflowing from the upper part was scraped off. 4) The weight was measured with a weigher to determine the density.
スパチュラ角の測定は、図５に示す器具でなされたものであり、次の手順により行った。１）スパチュラ板（２２×１０５ｍｍ）に十分な量の試料を堆積させた。２）スパチュラ板を上昇させてスパチュラ板に残った試料の傾斜角を測定した。なお、３箇所測定した。３）錘で衝撃を与えた後、残った試料の傾斜角を測定した。４）衝撃を与える前後の傾斜角（計６箇所）の平均値を求めた。 The measurement of the spatula angle was made with the instrument shown in FIG. 5 and was performed according to the following procedure. 1) A sufficient amount of sample was deposited on a spatula plate (22 × 105 mm). 2) The spatula plate was raised and the inclination angle of the sample remaining on the spatula plate was measured. Three points were measured. 3) After applying an impact with a weight, the tilt angle of the remaining sample was measured. 4) The average value of the tilt angles before and after applying the impact (total of 6 locations) was determined.
また、均一度（ＵＦ）は、粒度分布測定から得た累積分布曲線より６０％粒子径（Ｘ６０）および１０％粒子径（Ｘ１０）を用いて次式により求めた。
ＵＦ＝Ｘ６０／Ｘ１０
Further, the degree of uniformity (UF) was determined from the cumulative distribution curve obtained from the particle size distribution measurement using the following equation using 60% particle diameter (X60) and 10% particle diameter (X10).
UF = X60 / X10
上記手段により、粉体の安息角、圧縮度、スパチェラ角、均一度を測定し、各測定結果を表２に示す表を参考に指標化し、合計した値を粉体の流動性指標とした。 By the above means, the angle of repose, the degree of compression, the spatula angle, and the uniformity of the powder were measured. Each measurement result was indexed with reference to the table shown in Table 2, and the total value was used as the fluidity index of the powder.
この結果を図６に示す。従来の手順Ａに比べ、より平均粒径の小さい粉体が混ざっている粉体へシリコンオイルを添加する手順Ｂ、または平均粒径の小さい粉体から順にシリコンオイルを添加する手順Ｂを採用した方が、流動性指数が大きくなって流動性が良くなった。また、シリコンオイルの添加比率が小さい条件でも、即ちシリコンオイルが少なくても流動性を確保できた。手順Ａ〜Ｃを比べると、シリコンオイルの添加順が異なると、流動性指数が良くも悪くもなることが分かった。また、従来の手順Ａが流動性指数が悪いということも分かった。尚、従来の手順Ａの実操業における工程は図９に示すとおりである。 The result is shown in FIG. Compared to the conventional procedure A, the procedure B in which silicon oil is added to the powder in which the powder having a smaller average particle diameter is mixed, or the procedure B in which silicon oil is added in order from the powder having the smaller average particle diameter is adopted. However, the liquidity index increased and the liquidity improved. Further, fluidity could be secured even under the condition that the addition ratio of silicon oil was small, that is, even when the amount of silicon oil was small. Comparing the procedures A to C, it was found that the flowability index was good or bad when the addition order of the silicone oil was different. It was also found that the conventional procedure A has a poor fluidity index. In addition, the process in the actual operation of the conventional procedure A is as shown in FIG.
図６に示されていることから理解されるように、手順Ｃは、シリコンオイルの添加量比率（ｗｔ％）が０．１以下の場合が効果的である。特に、図６からは０．０２〜０．１以下の比率の場合に効果が得られることが見て取れる。また、シリコンオイルが０．０６〜０．１の比率の場合、他の手順で混合した場合よりも手順Ｃを採用したほうが、流動性指数が向上しやすくなることがわかる。 As understood from FIG. 6, the procedure C is effective when the addition amount ratio (wt%) of silicon oil is 0.1 or less. In particular, it can be seen from FIG. 6 that the effect is obtained when the ratio is 0.02 to 0.1 or less. Moreover, when silicon oil is a ratio of 0.06 to 0.1, it is understood that the fluidity index is more easily improved when the procedure C is adopted than when the mixing is performed by other procedures.
ところで、シリコンオイルは高価なうえに、炉内に入れば、揮発するだけのものである。このため、その添加量はなるべく少なくすることが求められるが、図６には、シリコンオイルの添加量比率（ｗｔ％）が０．０６以下でも比較的高い流動性指数を維持できることも示されている。特に０．０２〜０．０６の比率の場合であっても、従来からなされてきた手順Ａと比べて流動性が良いことが見て取れ、コストや資源の有効活用という面において、優れた手段であることが理解できる。なお、運転条件のばらつきなどを考慮すると、シリコンオイルを０．０３〜０．０６の比率で投入することが好ましい。 By the way, silicon oil is expensive and only volatilizes when it enters the furnace. For this reason, it is required to reduce the addition amount as much as possible, but FIG. 6 also shows that a relatively high fluidity index can be maintained even when the addition amount ratio (wt%) of silicon oil is 0.06 or less. Yes. In particular, even in the case of the ratio of 0.02 to 0.06, it can be seen that the fluidity is better than the procedure A which has been conventionally performed, and is an excellent means in terms of effective use of cost and resources. I understand that. In consideration of variations in operating conditions, silicon oil is preferably added at a ratio of 0.03 to 0.06.
以上に示すように、複数の脱りん用粉体を用いた製鋼の精錬方法において、最大平均粒径以外の脱りん用粉体にシリコンオイルを混合した後に他の脱りん用粉体を混合し、配管にて気流搬送することで、配管の詰まりを抑制することが可能である。特に、平均粒径が最も小さい脱りん用粉体にシリコンオイルを混合した後に他の脱りん用粉体を混合し、配管にて気流搬送することで、配管の詰まりを効果的に抑制することが可能である。 As described above, in a steelmaking refining method using a plurality of dephosphorization powders, silicon oil is mixed with dephosphorization powder other than the maximum average particle size, and then other dephosphorization powders are mixed. It is possible to suppress clogging of the pipe by carrying the air current through the pipe. In particular, by mixing silicon oil with the dephosphorization powder with the smallest average particle size, and then mixing other dephosphorization powder and carrying it by airflow through the piping, it effectively suppresses clogging of the piping. Is possible.
次に脱硫の場合について説明する。脱硫にはＣａＯとＮａ２ＣＯ３の混合粉体を製鋼の予備処理に使用される炉に吹き込んでいる。窒素をキャリアーガスとして底吹き羽口から炉に吹き込む前に、ＣａＯとＮａ２ＣＯ３とシリコンオイルを混合しているが、図１０に示すように、従来の手順においては、ホッパに貯留されたＮａ２ＣＯ３に対してシリコンオイルを混合して搬送し、Ｎａ２ＣＯ３とシリコンオイルとの混合物をＣａＯと混合して搬送する。なお、各搬送は、スクリューフィーダにより行われ、粉体は攪拌されながら搬送される。 Next, the case of desulfurization will be described. For desulfurization, a mixed powder of CaO and Na 2 CO 3 is blown into a furnace used for pretreatment of steelmaking. CaO, Na 2 CO 3 and silicon oil are mixed before nitrogen is blown into the furnace as a carrier gas from the bottom blowing tuyeres. However, as shown in FIG. conveying a mixture of silicone oil with respect to Na 2 CO 3, carrying a mixture of Na 2 CO 3 and the silicon oil is mixed with CaO. Each conveyance is performed by a screw feeder, and the powder is conveyed while being stirred.
本実施形態においては、粒径の異なる粉体と液体状のシリコンオイルを備えた精錬剤を形成するに当たり、シリコンオイルと各粉体の混合手順と、粉体の流動性との関係を確認するため、ＣａＯとＮａ２ＣＯ３の混合粉体からなる脱硫剤、及びシリコンオイルに関し、表３に示すような手順で混合を実施した。ここで表３中の手順Ｃは従来の添加順である。なお、図７にＣａＯとＮａ２ＣＯ３の混合粉体の粒径データを示す。 In the present embodiment, in forming a refining agent comprising powder having different particle diameters and liquid silicone oil, the relationship between the mixing procedure of silicone oil and each powder and the fluidity of the powder is confirmed. Therefore, the desulfurizing agent composed of a mixed powder of CaO and Na 2 CO 3 and silicon oil were mixed according to the procedure shown in Table 3. Here, the procedure C in Table 3 is the conventional order of addition. FIG. 7 shows the particle size data of the mixed powder of CaO and Na 2 CO 3 .
シリコンオイルの添加量を変化させて手順Ａ、Ｂ、Ｃの流動指数の変化をみた。この結果を図８に示す。従来の手順Ｃに比べ、より平均粒径の小さい粉体が混ざっている粉体へシリコンオイルを添加する手順Ａ、または平均粒径の小さい粉体から順にシリコンオイルを添加する手順Ｂを採用したほうが、流動性指数が大きくなって流動性が良くなった。また、シリコンオイルの添加比率が小さい条件でも、即ちシリコンオイルが少なくても流動性を確保できる傾向があることがわかる。尚、従来の手順Ｃの実操業における工程を図１０に示す。 The flow index of the procedures A, B, and C was changed by changing the amount of silicon oil added. The result is shown in FIG. Compared with the conventional procedure C, the procedure A in which silicon oil is added to the powder in which the powder having a smaller average particle diameter is mixed, or the procedure B in which silicon oil is added in order from the powder having the smaller average particle diameter is adopted. However, the liquidity index increased and the liquidity improved. It can also be seen that the fluidity tends to be secured even under the condition that the addition ratio of the silicone oil is small, that is, even if the silicone oil is small. In addition, the process in the actual operation of the conventional procedure C is shown in FIG.
図８に示す例においては、手順Ｂを用いるとシリコンオイルの添加量比率（ｗｔ％）が０．１以下の場合に手順Ａよりも流動性指数が高くなることから、一定の効果が得られることが理解される。特に、０．０５〜０．１以下の比率の場合に効果が得られることが見て取れる。また、シリコンオイルが０．０６〜０．１の比率の場合、従来から行われている手順Ｃで混合した場合よりも流動性指数が向上しやすくなることがわかる。コスト面なども考慮すると、シリコンオイルの添加量比率（ｗｔ％）が０．０５〜０．０８の比率であることが好ましい。また、運転条件のばらつきなどを考慮すると、０．０６〜０．０８の比率とすることが好ましい。 In the example shown in FIG. 8, when the procedure B is used, the fluidity index is higher than that in the procedure A when the addition amount ratio (wt%) of silicon oil is 0.1 or less, so that a certain effect can be obtained. It is understood. In particular, it can be seen that the effect is obtained when the ratio is 0.05 to 0.1 or less. Moreover, when the ratio of silicone oil is 0.06-0.1, it turns out that a fluidity | liquidity index becomes easy to improve rather than the case where it mixes by the procedure C currently performed conventionally. Considering the cost and the like, it is preferable that the addition amount ratio (wt%) of silicon oil is a ratio of 0.05 to 0.08. In consideration of variations in operating conditions, the ratio is preferably 0.06 to 0.08.
本実施形態によると、複数の脱硫用粉体を用いた製鋼の精錬方法において、最大平均粒径以外の脱硫用粉体にシリコンオイルを混合した後に他の脱硫用粉体を混合し、配管にて気流搬送することで、詰まりなく気流搬送し、コスト的に有効な潤滑用シリコンオイル添加方法とすることが可能となる。また、平均粒径が最も小さい脱硫用粉体にシリコンオイルを混合した後に他の脱硫用粉体を混合し、配管にて気流搬送することで、効果的に詰まりなく気流搬送し、コスト的に有効な潤滑用シリコンオイル添加方法とすることが可能である。特に製鋼の予備処理に使用される炉において、搬送配管を通して混合された複数の精錬粉体を詰まりなく気流搬送するにあたり、詰まり改善効果およびコスト的に有効な潤滑用シリコンオイル添加方法とすることが可能となる。 According to the present embodiment, in the steelmaking refining method using a plurality of desulfurization powders, after mixing silicon oil with desulfurization powder other than the maximum average particle size, other desulfurization powders are mixed, By carrying the air flow, it is possible to carry the air flow without clogging and to obtain a cost effective silicone oil addition method for lubrication. In addition, after mixing silicon oil with the desulfurization powder with the smallest average particle size, other desulfurization powder is mixed and air-conveyed by piping, effectively air-carrying without clogging. It is possible to provide an effective method for adding silicon oil for lubrication. Especially in a furnace used for pre-treatment of steelmaking, in order to carry a plurality of refined powders mixed through a conveyance pipe without air clogging, a clogging improvement effect and a cost effective silicone oil addition method should be used. It becomes possible.
本発明は、以上の実施形態には限定されることは無く、本発明の趣旨を逸脱しない範囲で適応可能なことは勿論のことである。例えば、脱リンや脱硫以外に適用しても良い。また、製鋼の予備処理に使用される炉に気流搬送する場合に限ることもない。 The present invention is not limited to the above embodiment, and it is needless to say that the present invention can be applied without departing from the spirit of the present invention. For example, you may apply in addition to dephosphorization or desulfurization. Further, the present invention is not limited to the case where the air current is conveyed to a furnace used for pretreatment of steelmaking.
複数種類の粉体とシリコンオイルの混合体は、気流搬送する前に、一旦貯留される必要は無い。 The mixture of a plurality of types of powder and silicon oil does not need to be temporarily stored before being conveyed by airflow.
また、実施例に示した例とは異なる脱硫剤や脱りん材やシリコンオイルとすることも可能である。 Moreover, it is also possible to use a desulfurizing agent, a dephosphorizing material, or silicon oil different from the examples shown in the examples.
Claims (6)
最大平均粒径以外の粉体にシリコンオイルを混合した後に他の粉体を混合して気流搬送することを特徴とする粉体の配管による気流搬送方法。 In the case of mixing two or more powders with different average particle diameters and silicon oil and carrying them by air flow through piping,
An airflow conveying method using powder piping, wherein silicon oil is mixed with powder having a particle size other than the maximum average particle diameter, and then mixed with other powders for airflow conveyance.
平均粒径が最も小さい粉体にシリコンオイルを混合した後に他の粉体を混合して気流搬送することを特徴とする粉体の配管による気流搬送方法。 In the case of mixing two or more powders with different average particle diameters and silicon oil and carrying them by air flow through piping,
A method of air current conveyance using powder piping, characterized in that silicon oil is mixed with powder having the smallest average particle diameter and then other powders are mixed and air current conveyed.
最大平均粒径以外の脱りん用粉体にシリコンオイルを混合した後に他の脱りん用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法。 A method of refining steel using a plurality of dephosphorization powders,
A method for refining steelmaking, comprising mixing silicon oil with dephosphorization powder having a particle size other than the maximum average particle size, mixing the dephosphorization powder with another, and transporting the air through a pipe.
平均粒径が最も小さい脱りん用粉体にシリコンオイルを混合した後に他の脱りん用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法。 A method of refining steel using a plurality of dephosphorization powders,
A method for refining steel making, characterized in that silicon oil is mixed with dephosphorization powder having the smallest average particle size, and then other dephosphorization powder is mixed and air-conveyed by piping.
最大平均粒径以外の脱硫用粉体にシリコンオイルを混合した後に他の脱硫用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法。 A method of refining steel using a plurality of powders for desulfurization,
A method for refining steel making, comprising mixing silicon oil with desulfurization powder other than the maximum average particle size, mixing other desulfurization powder, and conveying the air flow through a pipe.
平均粒径が最も小さい脱硫用粉体にシリコンオイルを混合した後に他の脱硫用粉体を混合し、配管にて気流搬送することを特徴とする製鋼の精錬方法。 A method of refining steel using a plurality of powders for desulfurization,
A method for refining steelmaking, comprising mixing silicon oil with desulfurization powder having the smallest average particle size, mixing other desulfurization powder, and carrying the air flow through a pipe.
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