JP2006265617A - Method of producing scrap wood briquette for refining furnace and scrap wood briquette for refining furnace produced by the method - Google Patents
Method of producing scrap wood briquette for refining furnace and scrap wood briquette for refining furnace produced by the method Download PDFInfo
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Abstract
Description
本発明は、製錬炉用廃材ブリケットの製造方法および該方法によって製造される製錬炉用廃材ブリケットに関する。 The present invention relates to a method for producing a waste briquette for a smelting furnace and a waste briquette for a smelting furnace produced by the method.
金属合金の製造においては、金属合金の溶製もしくはその副原料の溶製に、電気製錬炉等の高炉型冶金炉を用いて製錬工程がとられることがある。金属合金の一種であるたとえばステンレス鋼では、その主成分としてクロム（Ｃｒ）を含有し、またいわゆるニッケル（Ｎｉ）系と呼ばれるものではＮｉを含有するので、製錬工程が採られる場合、製錬工程において、Ｃｒと鉄（Ｆｅ）との合金屑やＮｉ含有ペレットなどが、Ｃｒ原料およびＮｉ原料として用いられる。しかしながら、近年これらの原料は、需要に対する供給が逼迫していることから、価格が高騰するとともに入手自体が困難な状況にある。 In the production of a metal alloy, a smelting process may be taken using a blast furnace type metallurgical furnace, such as an electric smelting furnace, for melting a metal alloy or its auxiliary materials. For example, stainless steel, which is a kind of metal alloy, contains chromium (Cr) as a main component, and so-called nickel (Ni) -based material contains Ni. In the process, alloy scraps of Cr and iron (Fe), Ni-containing pellets, and the like are used as the Cr raw material and the Ni raw material. However, in recent years, these raw materials are in a situation where supply is difficult and acquisition is difficult as the price increases due to tight supply to demand.
このような現状から、たとえばＮｉについては、Ｎｉ含有廃触媒から油脂分を除去して鉄鋼原料として使用することが提案されており（たとえば、特許文献１参照）、また他の先行技術ではＮｉ含有廃触媒とともに金属製造工程において発生した研削屑等の金属質廃材から油脂分を除去して鉄鋼原料として使用することが提案されている（たとえば、特許文献２参照）。 From such a current situation, for example, for Ni, it has been proposed to remove oils and fats from a Ni-containing waste catalyst and use it as a raw material for steel (for example, see Patent Document 1). It has been proposed to remove oils and fats from a metal waste such as grinding scrap generated in the metal production process together with the waste catalyst and use it as a steel raw material (see, for example, Patent Document 2).
しかしながら、Ｎｉ含有廃触媒および金属質廃材は、その形状が粉粒状または泥状を呈するので、このような形状の物を製錬原料として製錬炉に投入すると、炉内の通風を阻害して炉況が悪化するとともに、Ｎｉ含有廃触媒および金属質廃材自体が集塵されることによって歩留が低下するという問題がある。 However, since the Ni-containing waste catalyst and the metallic waste material are in the form of powder or mud, if an article having such a shape is input to the smelting furnace as a smelting raw material, the ventilation in the furnace is inhibited. As the furnace condition deteriorates, there is a problem that the yield decreases due to dust collection of the Ni-containing waste catalyst and the metal waste material itself.
特許文献１および特許文献２では、Ｎｉ含有廃触媒および金属質廃材から油脂分を揮発させるために、キルンまたは誘導加熱炉などの加熱炉で油脂分の気化温度以上に加熱し、加熱炉に不活性ガスを導入・排気し、排ガスとともに気化した油脂分を炉へ排出するけれども、この排ガスによってＮｉ含有廃触媒および金属質廃材が飛散することを防止するために、Ｎｉ含有廃触媒および金属質廃材を製団（ブリケット化）することが提案されている。 In Patent Document 1 and Patent Document 2, in order to volatilize the oil and fat from the Ni-containing waste catalyst and the metal waste material, heating is performed at a temperature higher than the vaporization temperature of the oil and fat in a heating furnace such as a kiln or an induction heating furnace. In order to prevent Ni-containing waste catalyst and metallic waste material from being scattered by the exhaust gas, the active gas is introduced and exhausted, and the oil and fat vaporized together with the exhaust gas is discharged into the furnace. It has been proposed to form a briquette.
Ｎｉ含有廃触媒および金属質廃材を製団することによって、これらを製錬原料として用いる場合における製錬炉内の通風維持および歩留向上が期待できる。しかしながら、特許文献１および特許文献２では、油脂分除去時の急速加熱による崩壊防止のために、Ｎｉ含有廃触媒および金属質廃材の製団に結合剤として、高価なピッチ、セメントまたは水ガラスが用いられるので、このような結合剤で製団されたＮｉ含有廃触媒および金属質廃材を製錬原料に用いると、製鋼コストが極めて高くなるという問題がある。 By making a Ni-containing waste catalyst and a metallic waste material, it can be expected to maintain ventilation and improve yield in the smelting furnace when these are used as smelting raw materials. However, in Patent Document 1 and Patent Document 2, an expensive pitch, cement, or water glass is used as a binder for a Ni-containing waste catalyst and a metal waste material group to prevent collapse due to rapid heating at the time of oil and fat removal. Therefore, when the Ni-containing waste catalyst and the metal waste material produced with such a binder are used as a smelting raw material, there is a problem that the steelmaking cost becomes extremely high.
本発明の目的は、熱間強度に優れて製錬炉の炉況安定に寄与することができ、安価に製造することのできる製錬炉用廃材ブリケットの製造方法および該方法によって製造される製錬炉用廃材ブリケットを提供することである。 An object of the present invention is to provide a method for producing a waste briquette for a smelting furnace that is excellent in hot strength and contributes to stabilization of the furnace condition of the smelting furnace, and can be produced at a low cost, and a process produced by the method. It is to provide waste briquettes for smelting furnaces.
ここで、廃材とは、油脂分、水分等を含み、粉状、細粒状の形状を有し、そのまま製錬炉に投入すれば、歩留の低下および／または炉況悪化を引起す原料を総称する。 Here, the waste material is a raw material containing fats and oils, moisture, etc., having a powdery shape and a fine granular shape, and causing a decrease in yield and / or deterioration of the furnace condition if it is put into a smelting furnace as it is. Collectively.
本発明は、金属成分を含有する廃材を製錬炉の原料として使用するために塊状化する製錬炉用廃材ブリケットの製造方法において、
金属成分を含有する粉粒状廃材と、結合剤とを混練する混練工程と、
混練工程において混練された混練物をブリケットに製団する製団工程と、
製団されたブリケットを自然養生する養生工程とを含むことを特徴とする製錬炉用廃材ブリケットの製造方法である。
The present invention is a method for producing a waste briquette for a smelting furnace that is agglomerated in order to use a waste material containing a metal component as a raw material for a smelting furnace.
A kneading step of kneading a powdery waste material containing a metal component and a binder;
A step of making a briquette of the kneaded material kneaded in the kneading step;
A method for producing waste briquettes for a smelting furnace, comprising a curing process for naturally curing a briquette that has been formed.
また本発明は、金属成分を含有する廃材を製錬炉の原料として使用するために塊状化する製錬炉用廃材ブリケットの製造方法において、
金属成分を含有する粉粒状廃材と、結合剤とを混練する混練工程と、
混練工程において混練された混練物をブリケットに製団する製団工程と、
製団されたブリケットを強制乾燥する乾燥工程とを含むことを特徴とする製錬炉用廃材ブリケットの製造方法である。
Further, the present invention provides a method for producing a waste briquette for a smelting furnace that is agglomerated in order to use a waste material containing a metal component as a raw material for a smelting furnace.
A kneading step of kneading a powdery waste material containing a metal component and a binder;
A step of making a briquette of the kneaded material kneaded in the kneading step;
A method for producing waste briquettes for a smelting furnace, comprising a drying step of forcibly drying a briquette that has been formed.
また本発明は、結合剤が、混練物全体に対して８〜２０重量％含有されることを特徴とする。 Further, the present invention is characterized in that the binder is contained in an amount of 8 to 20% by weight based on the entire kneaded product.
また本発明は、結合剤が、ベントナイト、デンプンおよびパルプ廃液からなる群より選択される１または２以上であることを特徴とする。 Further, the present invention is characterized in that the binder is one or more selected from the group consisting of bentonite, starch and pulp waste liquid.
また本発明は、粉粒状廃材に含有される金属成分が、ニッケルであることを特徴とする。 Moreover, this invention is characterized by the metal component contained in a granular waste material being nickel.
また本発明は、前記いずれかの製造方法によって製造されることを特徴とする製錬炉用廃材ブリケットである。 Further, the present invention is a waste briquette for a smelting furnace produced by any one of the production methods described above.
本発明によれば、金属成分を含有する粉粒状廃材と結合剤とを混練し、混練物をブリケットに製団し、製団されたブリケットを自然養生または強制乾燥して製錬炉用廃材ブリケットが製造されるので、熱間強度に優れ製錬炉の炉況を安定化させ、集塵等によって消耗することなく歩留を向上することのできる製錬炉用廃材ブリケットを得ることができる。 According to the present invention, a powdery waste material containing a metal component and a binder are kneaded, the kneaded product is formed into briquettes, and the formed briquettes are naturally cured or forcibly dried to produce a waste briquette for a smelting furnace. Therefore, it is possible to obtain a waste briquette for a smelting furnace that has excellent hot strength, stabilizes the furnace condition of the smelting furnace, and can improve the yield without being consumed by dust collection or the like.
また本発明によれば、結合剤が、混練物全体に対して好適範囲に含有されるので、熱間強度に優れ、製錬用原料として有用な量の金属成分を含有する製錬炉用廃材ブリケットを製造することができる。 Further, according to the present invention, since the binder is contained in a suitable range with respect to the entire kneaded product, the waste material for a smelting furnace is excellent in hot strength and contains a metal component in an amount useful as a raw material for smelting. Briquettes can be manufactured.
また本発明によれば、結合剤として、ベントナイト、デンプンおよびパルプ廃液からなる群より選択される１または２以上が用いられるので、製団後製錬炉へ装入されるまでの装入前強度および熱間強度に優れる製錬炉用廃材ブリケットを安価に製造することができる。 Further, according to the present invention, as the binder, one or more selected from the group consisting of bentonite, starch, and pulp waste liquid is used, so that the strength before charging until charging into the smelting furnace after the formation is performed. Also, waste briquettes for smelting furnaces having excellent hot strength can be produced at low cost.
また本発明によれば、ニッケル（Ｎｉ）を含有する粉粒状廃材を製錬用原料として用いることが可能になるので、高価なＮｉをリサイクルして有効活用することができる。 Further, according to the present invention, it becomes possible to use a granular waste material containing nickel (Ni) as a raw material for smelting, so that expensive Ni can be recycled and effectively used.
また本発明の製錬炉用廃材ブリケットによれば、製錬炉の炉況を安定化させ、歩留を向上し、製鋼コストを抑制することができる。 Moreover, according to the waste briquette for the smelting furnace of the present invention, the furnace condition of the smelting furnace can be stabilized, the yield can be improved, and the steelmaking cost can be suppressed.
本発明は、金属成分を含有する廃材を製錬炉の原料として使用するために塊状化する製錬炉用廃材ブリケットの製造方法において、金属成分を含有する粉粒状廃材と、結合剤とを混練する混練工程と、混練工程において混練された混練物をブリケットに製団する製団工程と、製団されたブリケットを自然養生する養生工程および／または製団されたブリケットを強制乾燥する乾燥工程とを含むことを特徴とする製錬炉用廃材ブリケットの製造方法である。 The present invention is a method for producing a waste briquette for a smelting furnace in which a waste material containing a metal component is agglomerated for use as a raw material for a smelting furnace, and kneading a powdery waste material containing a metal component and a binder. A kneading step, a forming step for forming the kneaded material kneaded in the kneading step into briquettes, a curing step for naturally curing the formed briquettes and / or a drying step for forcibly drying the formed briquettes It is a manufacturing method of the waste briquette for smelting furnaces characterized by including.
金属成分を含有する粉粒状廃材として、ここではＮｉを含有する粉粒状廃材を例示する。製錬炉の原料となり得るＮｉ含有廃材としては、たとえば以下のようなものがある。食品または薬剤を製造するときの反応促進に用いられるＮｉ系触媒が、繰返し使用されて、触媒活性を喪失した使用済みＮｉ含有廃触媒。また日本工業規格（ＪＩＳ）Ｇ４３０５などにＳＵＳ３００番代で規定される、いわゆるＮｉ系のステンレス鋼の製造工程において発生する研削屑または研磨屑などの副生品およびこれらを含む研削油／研磨油。Ｎｉ系のステンレス鋼を溶製する電気炉および転炉のダスト。Ｎｉ系ステンレス鋼帯を酸洗した酸洗液の酸洗スラジ。焼鈍されたＮｉ系ステンレス鋼帯の表面からショットブラストなどで除去したスケール粉。 As the granular waste material containing a metal component, here, a granular waste material containing Ni is exemplified. Examples of Ni-containing waste materials that can be used as a raw material for a smelting furnace include the following. A spent Ni-containing waste catalyst in which a Ni-based catalyst used for promoting a reaction when producing a food or a drug is repeatedly used to lose its catalytic activity. In addition, by-products such as grinding scraps or polishing scraps generated in the manufacturing process of so-called Ni-based stainless steel specified by the SUS300 generation in Japanese Industrial Standard (JIS) G4305, etc., and grinding oil / polishing oil containing them. Electric furnace and converter dust for melting Ni-based stainless steel. Pickling sludge of pickling solution obtained by pickling Ni-based stainless steel strip. Scale powder removed from the surface of annealed Ni stainless steel strip by shot blasting.
ここで粉粒状とは、その大きさが特に厳密に規定されるものではないけれども、おおよそ５ｍｍ未満のものを指し、さらに、おおよそ５ｍｍ未満の粒子が油脂分と混在してスラジ（泥）状になったものをも含めた意味に用いる。 Here, although the size of the powder is not particularly strictly defined, it refers to a particle of less than about 5 mm, and particles of less than about 5 mm are mixed with oils and fats to form a sludge (mud). It is used to mean including
結合剤として、ベントナイト、デンプンおよびパルプ廃液からなる群より選択される１または２以上が用いられることが好ましい。本発明によって製造される製錬炉用廃材ブリケットは、製錬用原料として使用されるので、製錬炉に装入された後、炉内で乾燥され、加熱され、焼結される過程を緩慢に進行するので、急速加熱に起因する割れおよび崩壊の懸念が少ない。したがって、急速加熱に起因する割れおよび崩壊に耐え得る特性を有するピッチ、セメント、水ガラスなどの高価な結合剤を用いる必要がないので、安価なベントナイト、デンプン、パルプ廃液から選択される１または２以上を結合剤とすることによって、充分な熱間強度を発現し、炉況を安定化することが可能である。 As the binder, one or more selected from the group consisting of bentonite, starch and pulp waste liquid is preferably used. Since the waste briquette for smelting furnace produced by the present invention is used as a raw material for smelting, it is slowed in the process of being dried, heated and sintered in the furnace after being charged into the smelting furnace. Therefore, there is little concern about cracking and collapse due to rapid heating. Therefore, since it is not necessary to use expensive binders such as pitch, cement, water glass, etc., which have the characteristics that can withstand cracking and collapse caused by rapid heating, 1 or 2 selected from inexpensive bentonite, starch, pulp waste liquor By using the above as a binder, sufficient hot strength can be developed and the furnace condition can be stabilized.
また結合剤は、混練物全体に対して８〜２０重量％含有されることが好ましい。粉粒状廃材と結合剤とを含む製錬炉用廃材ブリケットは、製錬炉に装入されるまでに重機などで取扱われるので製団後の装入前強度が必要とされ、また製錬炉内へ装入されたときに炉内の通風を確保するために加熱された状態での熱間強度が必要とされる。結合剤の含有量が８重量％未満では、上記の装入前強度および熱間強度を充分に得ることができない。結合剤の含有量が２０重量％を超えると、製錬炉用廃材ブリケット中に含有されるＮｉの量が少なくなるので、製錬用原料として効率が低下する。したがって、混合物に対する結合剤の含有量を８〜２０重量％とした。 Moreover, it is preferable that 8-20 weight% of binder is contained with respect to the whole kneaded material. Waste briquettes for smelting furnaces containing powdered granular materials and binders are handled by heavy machinery etc. before being charged into the smelting furnaces, so the strength before charging after the formation is required. The hot strength in the heated state is required in order to ensure the ventilation in the furnace when charged into the furnace. When the content of the binder is less than 8% by weight, the above-mentioned strength before charging and hot strength cannot be sufficiently obtained. When the content of the binder exceeds 20% by weight, the amount of Ni contained in the smelting furnace waste briquette is reduced, so that the efficiency as a raw material for smelting decreases. Therefore, the content of the binder with respect to the mixture is 8 to 20% by weight.
以下製錬炉用廃材ブリケットの製造方法の各工程について説明する。
混練工程では、前述した好適範囲の含有量になるように計量したＮｉ含有粉粒状廃材と結合剤とを、たとえばミックスマーラー（浸透工業製）などの混練機によって混練する。製団工程では、混練工程で生成された混練物が、たとえば加圧ロール型製団機、パンペレタイザー型製団機、ミキサー型製団機などによってブリケットに製団される。製団されるブリケットの大きさは、たとえば５〜１００ｍｍである。養生工程では、製団されたブリケットを、たとえば屋内で３日間放置して自然養生する。
Hereinafter, each process of the manufacturing method of the waste briquette for smelting furnaces is demonstrated.
In the kneading step, the Ni-containing granular waste material and the binder weighed so as to have a content in the above-described preferable range are kneaded by a kneader such as a mix muller (manufactured by Osaka Kogyo). In the team making process, the kneaded product generated in the kneading process is made into a briquette by a pressure roll type making machine, a pan pelletizer type making machine, a mixer type making machine or the like. The size of the briquette to be formed is, for example, 5 to 100 mm. In the curing process, the formed briquette is left for indoors for 3 days for natural curing, for example.
なお、製団後の養生工程は、上記の自然養生に限定されることなく、たとえば熱風乾燥機などの乾燥装置内へブリケットを装入して強制乾燥する乾燥工程に置換えられてもよい。使用される結合剤の種類との対応では、結合剤にパルプ廃液を用いる場合、自然養生することが好ましく、結合剤にベントナイトおよび／またはデンプンを用いる場合、強制乾燥することが好ましい。結合剤に応じた養生または強制乾燥することによって、製錬炉用廃材ブリケットが優れた装入前強度を発現することができる。 The curing process after the formation is not limited to the natural curing described above, and may be replaced with a drying process in which briquettes are inserted into a drying apparatus such as a hot air dryer and forcedly dried. In correspondence to the type of binder used, it is preferable to naturally cure when using pulp waste liquid as the binder, and when using bentonite and / or starch as the binder, forced drying is preferable. By curing or forced drying according to the binder, the waste briquette for the smelting furnace can exhibit excellent strength before charging.
以下本発明の実施例について説明する。
本実施例では、結合剤であるパルプ廃液、ベントナイト、デンプンの含有量が種々に異なる製錬炉用廃材ブリケットを作製し、作製した製錬炉用廃材の特性を評価した。
Examples of the present invention will be described below.
In this example, smelting furnace waste briquettes having various contents of pulp waste liquid, bentonite, and starch as binders were produced, and the characteristics of the produced smelting furnace waste were evaluated.
（混合物の材料）
粉粒状廃材として、粒径が５ｍｍ以下の大きさのものの混入率が９０重量％以上であるＮｉを含有する廃触媒を用いた。結合剤としては、上記のパルプ廃液、ベントナイト、デンプンを使用し、それぞれ含有量を変化させた。混合物全体に対する結合剤の含有量は、本発明の実施例では８〜２０重量％の範囲で変化させ、本発明を外れる比較例では３〜７重量％の範囲で変化させた。
(Mixture material)
As the powdery waste material, a waste catalyst containing Ni having a particle size of 5 mm or less and a mixing ratio of 90% by weight or more was used. As the binder, the above pulp waste liquid, bentonite, and starch were used, and the contents were changed. The content of the binder with respect to the entire mixture was changed in the range of 8 to 20% by weight in the examples of the present invention, and was changed in the range of 3 to 7% by weight in the comparative examples outside the present invention.
（混合）
上記の材料を各組成比になるように準備し、アイリッヒミキサーで３分間それぞれ混合した。
(mixture)
The above materials were prepared so as to have various composition ratios, and mixed for 3 minutes with an Eirich mixer.
（混練）
混合工程で生成された混合物を、加圧式混練機であるミックスマーラー（浸透工業製）で３分間混練した。
(Kneading)
The mixture produced in the mixing step was kneaded for 3 minutes with a mix muller (manufactured by Osaka Kogyo Co., Ltd.) which is a pressure kneader.
（製団）
混練工程で生成された混練物を、加圧ロール型製団機（株式会社ケイハン製）で、３０ｍｍ×３０ｍｍ×１２ｍｍサイズのひし形形状を有するブリケットに製団した。
(Group)
The kneaded product generated in the kneading step was formed into briquettes having a rhombus shape of 30 mm × 30 mm × 12 mm size with a pressure roll type dumping machine (manufactured by Keihan Co., Ltd.).
（養生）
実施例および比較例ともに結合剤としてパルプ廃液を含有するブリケットについては、製団後、３日間天日乾燥して養生した。
(Healing)
In both Examples and Comparative Examples, briquettes containing pulp waste liquid as a binder were cured by drying in the sun for 3 days after forming.
（強制乾燥）
実施例および比較例ともに結合剤としてベントナイトまたはデンプンを含有するブリケットについては、製団後、６０℃×７ｈｒの条件にて強制乾燥した。
(Forced drying)
In both Examples and Comparative Examples, briquettes containing bentonite or starch as a binder were forcibly dried under the conditions of 60 ° C. × 7 hr after forming.
（評価方法）
（ａ）落下強度：養生（天日乾燥）後のブリケットのサンプルを５ｋｇ採取し、落下強度の指標である塊状率を測定した。ここで、落下強度とは、サンプル５ｋｇを２ｍの高さからコンクリートの床面に落下させる試験を４回繰返し、大きさが１０ｍｍ超えである粒子の残存率である塊状率を重量％で求めたものである。塊状率とは、落下試験後のサンプル５ｋｇを篩いにかけ、大きさが１０ｍｍ以下である粒子の重量ｗ［ｋｇ］を測定し、該重量ｗを用いて式（１）で得られる百分率を言う。塊状率の大きい方が、落下強度に優れると評価し、合格基準を塊状率９０．０％超えとした。
塊状率［％］＝１００×（１−ｗ／５） …（１）
(Evaluation methods)
(A) Drop strength: 5 kg of a briquette sample after curing (drying in the sun) was taken, and the lump ratio as an index of drop strength was measured. Here, the drop strength is a test in which a sample of 5 kg is dropped from a height of 2 m onto a concrete floor four times, and the mass ratio, which is the residual rate of particles having a size exceeding 10 mm, was determined by weight%. Is. The lump ratio is obtained by sieving 5 kg of the sample after the drop test, measuring the weight w [kg] of particles having a size of 10 mm or less, and using the weight w, the percentage obtained by the formula (1). It was evaluated that the larger lump ratio was excellent in drop strength, and the acceptance criterion was set to exceed lump ratio 90.0%.
Mass ratio [%] = 100 × (1−w / 5) (1)
（ｂ）電気製錬炉における使用試験
養生後または強制乾燥後のブリケットを、原料ブリケットとともに電気製錬炉に投入した。投入量は、落下強度に係る塊状率が９０％超えである本発明の実施例のブリケットについては合計約３，０００ｋｇｆ、塊状率が９０％以下である比較例のブリケットについては合計約１，５００ｋｇｆであった。実施例または比較例のブリケットと、表１に配合を示す原料ブリケットとを投入した状態で、電気製錬操業を行い、操業を通じて電気製錬炉に備わる集塵装置で収集したダストのＮｉ濃度を分析した。このＮｉ濃度を製錬炉用廃材ブリケットの飛散ロスの指標とし、Ｎｉ濃度が低いほど飛散ロスが少なく良好であると評価した。
(B) Use test in electric smelting furnace The briquette after curing or forced drying was put into the electric smelting furnace together with the raw material briquette. The input amount is about 3,000 kgf in total for the briquette of the embodiment of the present invention in which the lump ratio related to the drop strength exceeds 90%, and about 1,500 kgf in total for the briquette of the comparative example in which the lump ratio is 90% or less. Met. The electric smelting operation was carried out with the briquettes of the examples or comparative examples and the raw material briquettes shown in Table 1 being charged, and the Ni concentration of the dust collected by the dust collector provided in the electric smelting furnace through the operation was determined. analyzed. This Ni concentration was used as an index of the scattering loss of the waste briquette for the smelting furnace, and it was evaluated that the lower the Ni concentration, the smaller the scattering loss and the better.
（試験結果）
表２に塊状率の測定結果と、ダスト中のＮｉ濃度を分析した結果とを合わせて示す。まず塊状率については、結合剤であるパルプ廃液、ベントナイト、デンプンのいずれかが本発明範囲である８〜２０重量％の範囲で含有される実施例のブリケットは、９０．０％超えの値、すなわち落下強度が合格基準を満足するけれども、本発明範囲外である８重量％未満の結合剤しか含有しない比較例のブリケットは、最大でも８５．６％であり合格基準に達しなかった。
(Test results)
Table 2 shows the measurement result of the block rate and the result of analyzing the Ni concentration in the dust. First, for the bulk ratio, the briquette of the example in which any of pulp waste liquid, bentonite, and starch as a binder is contained in the range of 8 to 20% by weight, which is the range of the present invention, has a value exceeding 90.0%. That is, although the drop strength satisfies the acceptance criteria, the comparative briquette containing only less than 8% by weight of the binder, which is outside the scope of the present invention, was 85.6% at the maximum and did not reach the acceptance criteria.
ダスト中のＮｉ濃度については、本発明の実施例のブリケットを用いて操業した場合の分析結果は０．４％であったけれども、比較例のブリケットを用いて操業した場合の分析結果は１．８％であった。したがって、比較例のように落下強度が劣るブリケットでは、炉内でのダスト状の飛散および炉に投入するまでのハンドリング等による飛散が多くなるのに比べて、本発明の実施例のブリケットでは飛散が顕著に抑制されていることが判る。 Regarding the Ni concentration in the dust, the analysis result when operated using the briquette of the example of the present invention was 0.4%, but the analysis result when operated using the briquette of the comparative example was 1. It was 8%. Therefore, in the briquette of the drop strength as in the comparative example, in the briquette of the embodiment of the present invention, compared to the dust-like scattering in the furnace and the scattering due to handling until being put into the furnace, etc. It can be seen that is significantly suppressed.
以上に述べたように、本実施の形態では、粉粒状廃材がＮｉ含有廃材であるけれども、これに限定されることなく、たとえばクロムを含有する廃材であってもよい。 As described above, in the present embodiment, the granular waste material is a Ni-containing waste material. However, the present invention is not limited thereto, and may be, for example, a waste material containing chromium.
Claims (6)
金属成分を含有する粉粒状廃材と、結合剤とを混練する混練工程と、
混練工程において混練された混練物をブリケットに製団する製団工程と、
製団されたブリケットを自然養生する養生工程とを含むことを特徴とする製錬炉用廃材ブリケットの製造方法。 In the manufacturing method of the waste briquette for the smelting furnace that is agglomerated in order to use the waste material containing the metal component as the raw material of the smelting furnace,
A kneading step of kneading a powdery waste material containing a metal component and a binder;
A step of making a briquette of the kneaded material kneaded in the kneading step;
A method for producing a waste briquette for a smelting furnace, comprising a curing process for naturally curing a briquette that has been formed.
金属成分を含有する粉粒状廃材と、結合剤とを混練する混練工程と、
混練工程において混練された混練物をブリケットに製団する製団工程と、
製団されたブリケットを強制乾燥する乾燥工程とを含むことを特徴とする製錬炉用廃材ブリケットの製造方法。 In the method for producing a waste briquette for a smelting furnace that is agglomerated in order to use a waste material containing a metal component as a raw material for a smelting furnace,
A kneading step of kneading a powdery waste material containing a metal component and a binder;
A step of making a briquette of the kneaded material kneaded in the kneading step;
A method for producing waste briquettes for smelting furnaces, comprising: a drying step of forcibly drying the briquettes that have been formed.
ベントナイト、デンプンおよびパルプ廃液からなる群より選択される１または２以上であることを特徴とする請求項１〜３のいずれか１つに記載の製錬炉用廃材ブリケットの製造方法。 The binder is
The method for producing a waste briquette for a smelting furnace according to any one of claims 1 to 3, wherein the method is one or more selected from the group consisting of bentonite, starch and pulp waste liquid.
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