JP2525770B2 - Method for detoxifying chromium-containing slag and nozzle for crushing chromium-containing molten slag - Google Patents
Method for detoxifying chromium-containing slag and nozzle for crushing chromium-containing molten slagInfo
- Publication number
- JP2525770B2 JP2525770B2 JP61094763A JP9476386A JP2525770B2 JP 2525770 B2 JP2525770 B2 JP 2525770B2 JP 61094763 A JP61094763 A JP 61094763A JP 9476386 A JP9476386 A JP 9476386A JP 2525770 B2 JP2525770 B2 JP 2525770B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- nozzle
- chromium
- air
- molten 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.)
- Expired - Lifetime
Links
- 239000002893 slag Substances 0.000 title claims description 111
- 239000011651 chromium Substances 0.000 title claims description 37
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 36
- 229910052804 chromium Inorganic materials 0.000 title claims description 35
- 238000000034 method Methods 0.000 title claims description 19
- 239000002904 solvent Substances 0.000 claims description 21
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 5
- 238000004378 air conditioning Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 238000001784 detoxification Methods 0.000 claims description 2
- 238000010410 dusting Methods 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 11
- 229910000604 Ferrochrome Inorganic materials 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000004576 sand Substances 0.000 description 6
- 238000010828 elution Methods 0.000 description 5
- 229910001430 chromium ion Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/072—Tanks to collect the slag, e.g. water tank
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、フェロクロム滓，特殊鋼滓などのクロム含
有スラグを無害化ならびに崩壊しない高硬度の球状小粒
物に風砕，造粒するためのクロム含有スラグの無害化処
理方法および、この処理方法において用いる風砕用ノズ
ルに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is for crushing and granulating chromium-containing slag such as ferrochrome slag and special steel slag into spherical particles of high hardness that do not harm or collapse. The present invention relates to a detoxifying treatment method for chromium-containing slag, and a dusting nozzle used in this treatment method.
（従来の技術） フェロクロム滓，特殊鋼滓などクロム含有スラグを処
理する製造方法として、特公昭56-41590号により、溶融
状態にあるフェロクロム滓に、アルミナ耐火煉瓦クズ，
アルミナあるいは赤泥を添加して、スラグの融点および
粘性を低下させ、かつ溶滓の顕熱を利用して溶融反応を
行わせ、ガラス化してクロムイオンの溶出を防止してフ
ェロクロム滓より道路すべり防止材を製造する方法が開
示されている。(Prior Art) As a manufacturing method for treating chrome-containing slag such as ferrochrome slag and special steel slag, according to Japanese Patent Publication No. 56-41590, molten ferrochrome slag is treated with alumina refractory brick debris,
Alumina or red mud is added to lower the melting point and viscosity of the slag, and the sensible heat of the slag is used to cause the melting reaction to vitrify and prevent the elution of chromium ions to prevent road slippage from the ferrochrome slag. A method of making an inhibitor is disclosed.
また特公昭56-44792号には、溶融状態にあるフェロク
ロム，特殊鋼滓などクロム含有スラグに、該スラグの最
終組成が、SiO2 14.0〜61.0重量％，Al2O3 2.9〜14.8重
量％,MgO 5.6〜33.0重量％,CaO 1.6〜50.0重量％になる
べき量の珪酸塩質の岩石，鉱物あるいは赤泥，製錬中若
しくは出湯後の製錬炉内にまたは製錬炉から排出する溶
滓流に添加することを特徴としたクロム含有スラグの処
理方法が開示されている。Further, in Japanese Examined Patent Publication No. 56-44792, ferrochrome in a molten state, chromium-containing slag such as special steel slag, the final composition of the slag, SiO 2 14.0 ~ 61.0 wt%, Al 2 O 3 2.9 ~ 14.8 wt%, Silicate rocks, minerals or red mud in amounts that should be 5.6-33.0 wt% MgO and 1.6-50.0 wt% CaO, slag discharged into or from the smelting furnace during or after smelting A method for treating chromium-containing slag is disclosed which is characterized by being added to the stream.
（発明が解決しようとする問題点） 還元溶解炉で製造されるフェロクロムやその他の特殊
鋼と共に副生されるスラグ、すなわちフェロクロム滓や
特殊鋼滓は、Cr2O3を約0.5〜7.0重量％含んでいる。従
って、このスラグを環境庁告示の溶出試験方法で溶出す
れば、Ｔ・Crイオン0.1〜2.5ppmを溶出し、公害問題を
ひき起こすと共に、自然崩壊を引き起こすという問題が
あった。(Problems to be solved by the invention) Slag produced as a by-product together with ferrochrome and other special steel produced in a reduction melting furnace, that is, ferrochrome slag and special steel slag, contains about 0.5 to 7.0% by weight of Cr 2 O 3. Contains. Therefore, if this slag is eluted by the elution test method announced by the Environmental Agency, T-Cr ions of 0.1 to 2.5 ppm will be eluted, causing pollution problems and spontaneous disintegration.
（問題点を解決するための手段） 本発明は、クロム含有スラグを処理するときに起きる
問題点を除去し，改善することを目的として開発された
ものであって、その要旨構成は下記のとおりである。(Means for Solving Problems) The present invention was developed for the purpose of eliminating and improving the problems that occur when treating chromium-containing slag, and its gist structure is as follows. Is.
すなわち、 1.（イ） クロム含有溶融スラグを滓鍋に注入する時、
SiO2,Al2O3を含む催溶剤を前記溶融スラグに添加混合す
る工程、および （ロ） 前記混合溶融スラグを滓鍋から受滓容器へ注出
する際に、ノズルより空気を噴出してこの混合溶融スラ
グを風砕して造粒する工程、 の各工程からなるクロム含有スラグの無害化処理におい
て、 上記工程（イ）における催溶剤の添加量は、クロム含
有溶融スラグ100重量部に対し３〜20重量部とし、 上記工程（ロ）における風砕処理に当たっては、３つ
の異なる開口形状の上位ノズル，中位ノズルおよび下位
ノズルからなる風砕用ノズルを用い、受滓容器に向けて
注出される混合溶融スラグを、上位ノズルより高速空気
を噴出させて風砕，造粒すると共に、中位ノズルより中
速空気を噴出させてさらに造粒しつつ冷却し、そして下
位ノズルより高速空気を噴出させて前記造粒スラグを風
砕スラグ収納容器内に吹き飛ばすこと、 を特徴とするクロム含有スラグの無害化処理方法、 2.受滓容器より注出され、流下するクロム含有溶融スラ
グ流に対面して設けられる風砕用ノズルであって、この
ノズルは、開口断面形状が略Ｕ字形の中位ノズルと、こ
の中位ノズルのＵ字状内底部上に近接して開口してい
る、下向きに膨らむ湾曲形スリット開口をもつ上位ノズ
ルと、該中位ノズルの外底部下に近接して開口してい
る、平行スリット形の開口をもつ下位ノズルから構成さ
れており、かつＵ字形状の中位ノズルの開口部内側には
噴出方向に沿って配設された複数枚の整風板を具え、そ
して中位，上位および下位の各ノズルの開口部の面積
は、Ｕ字状開口をもつ中位ノズルよりも、スリット状開
口をもつ上位ノズル，下位ノズルの方をそれぞれ小さく
したことを特徴とするクロム含有溶融スラグ風砕用ノズ
ル、 である。That is, 1. (a) When pouring molten slag containing chromium into the slag pan,
Admixing added催溶agent containing SiO 2, Al 2 O 3 in the molten slag, and (ii) the mixed molten slag when pouring from Kasunabe to受滓container, and ejecting air from a nozzle In the detoxification treatment of the chromium-containing slag, which comprises the steps of air-crushing the mixed molten slag and granulating, the addition amount of the solvent in the above step (a) is 100 parts by weight of the chromium-containing molten slag. 3 to 20 parts by weight, and in the air crushing process in the above step (b), the air crushing nozzle consisting of the upper nozzle, the middle nozzle and the lower nozzle having three different opening shapes is used and poured toward the slag container. The mixed molten slag that is discharged is blasted and granulated by ejecting high-speed air from the upper nozzle, and is cooled while granulating by further ejecting medium-speed air from the middle nozzle and then ejecting high-speed air from the lower nozzle. Let it gush Blowing the granulated slag into the air-crushed slag storage container, 2. A method for detoxifying chromium-containing slag, characterized in that it is provided facing the chrome-containing molten slag flow that is poured from the slag container and flows down. A nozzle for air crushing, wherein the nozzle has a substantially U-shaped opening cross-sectional shape and a U-shaped inner bottom portion of the middle nozzle, which is opened in close proximity to the nozzle and expands downward. Of a U-shaped middle nozzle, which is composed of an upper nozzle having a slit-shaped opening and a lower nozzle having a parallel slit-shaped opening, which is opened close to the outer bottom of the middle nozzle. The inside of the opening is provided with a plurality of air conditioners arranged along the jet direction, and the area of the openings of the middle, upper and lower nozzles is larger than that of the middle nozzle having a U-shaped opening. , Upper nozzle with slit-shaped opening, lower A nozzle for crushing molten slag containing chromium, characterized in that each of the nozzles has a smaller size.
（発明の好適実施形態） 溶融状態にあるフェロクロム滓，特殊鋼滓などクロム
含有スラグに、赤泥，珪酸塩質鉱物，カラミ，鋳物廃
砂，高炉スラグ，高炉鋳床集塵ダストなどのSiO2,Al2O3
を含む催溶剤を加えると、高融点のスラグの融点を下げ
流動性が増す。従って、スラグに催溶剤を加えると、そ
の後に施す風砕処理を行い易くし、かつ風砕処理により
急冷された催溶剤とクロム含有スラグの混合物は、Si
O2,Al2O3などの作用で、ガラス化する。その結果、クロ
ムイオンの溶出がなくなり、無害化できると共に、崩壊
性もなくなるのである。(Preferred embodiment of the invention) Chromium-containing slag such as ferrochrome slag and special steel slag in a molten state, SiO 2 such as red mud, silicate minerals, kalami, foundry sand, blast furnace slag, blast furnace cast bed dust collection dust. , Al 2 O 3
Addition of a solvent containing slag lowers the melting point of the high melting point slag and increases the fluidity. Therefore, when a solvent is added to the slag, it facilitates the subsequent air-blasting treatment, and the mixture of the solvent and the chromium-containing slag quenched by the air-blasting treatment is Si
It vitrifies by the action of O 2 , Al 2 O 3, etc. As a result, elution of chromium ions is eliminated, and it can be rendered harmless and also disintegrating.
本発明は、このような性質を利用して、クロム含有ス
ラグを無害化処理することにしたものである。The present invention utilizes such properties to detoxify the chromium-containing slag.
第１表は、本発明で処理対象とするフェロクロム滓，
特殊鋼滓などクロム含有スラグ（以下スラグａと称す）
および赤泥などSiO2,Al2O3を含む催溶剤（以下催溶剤ｂ
と称す）の化学組成を示す。Table 1 shows the ferrochrome slag to be treated in the present invention,
Slag containing chromium such as special steel slag (hereinafter referred to as slag a)
Solvents containing SiO 2 and Al 2 O 3 such as red mud (hereinafter solvent b
The chemical composition of
第１図は、溶融状態のスラグａに催溶剤ｂを投入する
方法および装置を示す図である。電気炉１より取鍋２へ
出滓された溶融スラグａは、滓鍋３へオーバフローし、
その落下位置へホッパ４からコンベア５により搬送さ
れ、シュート６を通して投入される。 FIG. 1 is a view showing a method and an apparatus for adding a solvent b to a molten slag a. The molten slag a discharged from the electric furnace 1 to the ladle 2 overflows into the slag pan 3,
It is conveyed from the hopper 4 to the dropping position by the conveyor 5 and is thrown in through the chute 6.
第２図は、第１図と同様、溶融状態のスラグａに催溶
剤ｂを投入する方法および装置を示す図である。取鍋２
をクレンで傾けスラグａを滓鍋３に落下させる際に、落
下位置に催溶剤ｂを投入する。FIG. 2 is a diagram showing a method and an apparatus for adding the solvent-solvent b to the molten slag a, as in FIG. Ladle 2
When the slag a is tilted with a wrench to drop the slag a into the slag pan 3, the solvent solvent b is put in the drop position.
第３図は滓鍋３よりスラグａと催溶剤ｂの混合溶融ス
ラグ（以下混合溶融スラグｃと称す）を風砕ノズル９に
より風砕，造粒する方法および装置を示す図である。FIG. 3 is a view showing a method and apparatus for air-mixing and granulating the mixed molten slag (hereinafter referred to as mixed molten slag c) of the slag a and the solvent eluent b from the slag pan 3 with the air-pulverizing nozzle 9.
この方法は、混合溶融スラグｃを所要の高さに配置さ
れた受滓容器７内へ、滓鍋３よりクレーンなどの所要手
段で投入し、受滓容器７より流出シュート８にて高速空
気を噴出する風砕ノズル９の噴出口前面に流下させ、混
合溶融スラグｃを高速空気で吹きとばし風砕スラグ収容
容器10内へ飛散させると、飛散中に冷却され下方へ落下
するが表面張力により粒状物とする方法である。In this method, the mixed molten slag c is charged into the slag container 7 arranged at a required height from the slag pan 3 by a required means such as a crane, and high-speed air is discharged from the slag container 7 by the outflow chute 8. When the mixed molten slag c is blown down by high-speed air and scattered into the air-crushing slag container 10 by being blown down to the front of the jetting nozzle of the jetting air-crushing nozzle 9, it is cooled during the scattering and drops downward, but it is granular due to surface tension. It is a method of dealing with things.
一方、風砕スラグ収納容器10内の熱風は、熱風回収用
孔11から取出され有効利用される。この風砕スラグ収納
容器10は、高速空気による飛散混合物の入口となる開口
部12,粒状混合物取出口13および熱風回収用孔11以外は
全周が密閉状のものであり、また飛散した混合スラグが
十分に飛散し、自然落下することができる内部空間を有
する大きさのものである。なお、この風砕スラグ収納容
器10の下底部に設けられる粒状混合物取出口13に溜まっ
た粒状混合物は、取出口13より順次容器10外へ取出さ
れ、コンベヤ14,ホッパ15などを経て、振動篩16により
サイズ別に分別採取される。On the other hand, the hot air in the air-crushed slag storage container 10 is taken out from the hot air recovery hole 11 and is effectively used. This air-crushed slag storage container 10 is of a hermetically-sealed shape except for the opening 12, which serves as the inlet of the scattered mixture by high-speed air, the granular mixture outlet 13, and the hot air recovery hole 11, and the scattered slag It has a size that has an internal space that can be sufficiently scattered and can fall naturally. The granular mixture collected in the granular mixture take-out port 13 provided at the bottom of the air-crushed slag storage container 10 is sequentially taken out of the container 10 through the take-out port 13 and passed through the conveyor 14, the hopper 15, etc., and the vibrating screen. It is sorted and collected by size according to 16.
第４図，第５図は、クロム含有混合溶融スラグｃの風
砕造粒処理に用いる風砕ノズル９の詳細図である。第４
図は横断面図、第５図は第４図のＩ−Ｉ線における縦断
面図である。FIG. 4 and FIG. 5 are detailed views of the air-crushing nozzle 9 used for the air-crushing and granulating process of the chromium-containing mixed molten slag c. Fourth
The drawing is a horizontal cross-sectional view, and FIG. 5 is a vertical cross-sectional view taken along the line II of FIG.
この風砕ノズル９は、３つの吹き出し（ノズル）を具
える、全体として開口断面形状がほぼＵ字状をなす樋状
のものである。即ち、先端開口部の断面形状が略Ｕ字状
を呈する樋状のものである中位ノズル91と、この中位ノ
ズル91のＵ字形湾曲内底部の上辺に近接して設けられた
上位ノズル92と、そしてこの中位ノズルの外底部下に近
接して設けられた下位ノズル93とから構成されている。The air-crushing nozzle 9 is a gutter-shaped nozzle having three blowouts (nozzles) and having an opening cross section of a substantially U-shape as a whole. That is, a middle nozzle 91 having a gutter-shaped cross section with a substantially U-shaped tip opening, and an upper nozzle 92 provided close to the upper side of the U-shaped curved inner bottom of the middle nozzle 91. And a lower nozzle 93 provided under and adjacent to the outer bottom of the middle nozzle.
その開口部面積は、上位ノズル92の両側部の上方にま
でのびるＵ字形中位ノズル91が最も大きく、下向きにふ
くらむ湾曲形スリット形状の上位ノズル92、平行スリッ
ト形状の下位ノズル93の方の開口部面積は小さい。The opening area of the upper nozzle 92 is the largest in the U-shaped middle nozzle 91 extending to the upper side of both sides of the upper nozzle 92, and the upper nozzle 92 of the curved slit shape bulging downward and the lower nozzle 93 of the parallel slit shape are opened. Part area is small.
また、上記中位ノズル91の開口部側の内部には、空気
の流れ方向を一定にさせるための直線状の整風板94が流
れの方向と平行に複数枚取付けられている。Further, inside the opening side of the middle nozzle 91, a plurality of linear air-conditioning plates 94 for keeping the air flow direction constant are attached in parallel to the flow direction.
この風砕ノズル９は、その開口部断面積に比例して、
各ノズル開口より噴出させる空気の速度は、中位ノズル
91から中速，上位ノズル92と下位ノズル93からは高速の
空気が噴出できるようになっている。This air-crushing nozzle 9 is proportional to the cross-sectional area of its opening,
The velocity of the air ejected from each nozzle opening is the middle nozzle
High-speed air can be ejected from 91, and high-speed air can be ejected from the upper nozzle 92 and the lower nozzle 93.
次に、上記風砕ノズル９を使ってスラグの風砕，造粒
を行う方法について説明する。Next, a method of performing crushing and granulation of slag using the above-mentioned crushing nozzle 9 will be described.
風砕ノズル９の噴出口前面に流下するクロム含有混合
溶融スラグｃは、まず高速の上位ノズル92から噴出され
る空気流の影響を受けて風砕され、造粒しはじめ、次い
で中速の中位ノズル91の噴出空気の影響により十分に冷
却されつつさらに造粒され、そして他の高速の下位ノズ
ル93からの噴射空気の作用により飛距離が延ばされるこ
とにより、製品粒状混合物となるのである。The chromium-containing mixed molten slag c flowing down to the front of the jet outlet of the air-blasting nozzle 9 is first air-blasted under the influence of the air flow ejected from the high-speed upper nozzle 92, begins to be granulated, and then medium speed medium speed. The granules are further granulated while being sufficiently cooled by the effect of the air blown from the nozzles 91, and the flight distance is extended by the action of the air blown from the other high speed lower nozzles 93 to form a product granular mixture.
次に本発明方法において、溶融クロム含有スラグに添
加する前記SiO2,Al2O3を含む赤泥，珪酸塩質鉱物，カラ
ミ，鋳物砂などの催溶剤の添加量について述べる。クロ
ム含有スラグの溶融点は1550℃以上であり催溶剤を添加
することにより溶融点を1500℃以下に下げることにより
流動性を増加させ、風砕処理を容易にするためには３重
量％以上の催溶剤を必要とする。Next, in the method of the present invention, the amount of addition of a solvent such as red mud containing SiO 2 and Al 2 O 3 , siliceous minerals, kalami, and foundry sand to be added to the molten chromium-containing slag will be described. The melting point of chromium-containing slag is 1550 ° C or higher, and by adding a solvent, the melting point is lowered to 1500 ° C or lower to increase the fluidity, and in order to facilitate the air-blasting treatment, the melting point is 3% by weight or more. Requires solvent.
また、風砕処理により得られる造粒混合物がクロムイオ
ンを溶出せず、かつ崩壊性を示さないためにも、３重量
％以上の催溶剤が必要である。Further, in order that the granulated mixture obtained by the air crushing process does not elute chromium ions and does not exhibit disintegration, 3% by weight or more of the solvent is required.
この催溶剤添加量の上限は、溶融スラグの有する顕熱
のみで催溶剤との溶融反応が可能となること、およびス
ラグの処理が目的であるので全体の処理の増加を少なく
するため、20重量％以下にする。したがって、催溶剤の
添加量は３〜20重量％の範囲内にする。The upper limit of the additive amount of the solvent is 20% by weight so that the melting reaction with the solvent can be performed only by the sensible heat of the molten slag, and the purpose of the treatment of the slag is to reduce the increase in the entire treatment. % Or less. Therefore, the amount of the solvent added should be within the range of 3 to 20% by weight.
次に本発明を実施例について説明する。Next, the present invention will be described with reference to examples.
（実施例） フェロクロム滓100重量部に約10重量部の粘板岩を添
加し、融点を約1500℃としたクロム含有溶融混合スラグ
を、中位ノズルから速度約90m/sec,上，下位ノズルから
夫々速度約200m/secの空気を噴出させ飛散させることに
より0.6〜5mm径を約84％含有する造粒混合物が得られ
た。その主成分はMgO・Al2O3（スピネル）であり、環境
庁告示方法による溶出試験の結果、Feイオンは0.80ppm
検出されたが、Cr,Cu,Pb,Cdの各有害イオンは全く検出
されず、また溶出水はpH7.4とほぼ中性であった。得ら
れた粒状物は比重約2.9、硬さHv783〜789で崩壊性は全
くなかった。(Example) About 10 parts by weight of slate was added to 100 parts by weight of ferrochrome slag, and a chromium-containing melt-mixed slag having a melting point of about 1500 ° C. was passed through the middle nozzle at a speed of about 90 m / sec, from the upper and lower nozzles, respectively. A granulated mixture containing about 84% of 0.6-5 mm diameter was obtained by ejecting air at a velocity of about 200 m / sec and scattering. Its main component is MgO ・ Al 2 O 3 (spinel), and Fe ion is 0.80ppm as a result of the elution test by the method announced by the Environment Agency.
Although it was detected, no harmful ions of Cr, Cu, Pb, and Cd were detected at all, and the elution water was pH 7.4, which was almost neutral. The obtained granules had a specific gravity of about 2.9 and a hardness of Hv783 to 789 and had no disintegration.
従って、本発明によりクロム含有スラグを無公害かつ
崩壊性のない高い硬さを有する粒状物を造粒することが
できる。この造粒物はサンドブラストの代用砂，土建用
砂として有効利用できると共に、溶融スラグの有する顕
熱を熱風として回収することができ、本発明は極めて有
用性を有するクロム含有スラグ処理方法および装置であ
ることが分かる。Therefore, according to the present invention, it is possible to granulate a chromium-containing slag with no pollution and with high hardness without disintegration. This granulated material can be effectively used as sand for sandblasting, sand for construction, and can recover the sensible heat of the molten slag as hot air. The present invention is a chromium-containing slag processing method and apparatus having extremely usefulness. I know there is.
（発明の効果） 本発明にかかるクロム含有スラグ処理方法およびクロ
ム含有溶融スラグ風砕用ノズルによれば、クロム含有ス
ラグを無公害かつ崩壊性のない高い硬さを有する粒状物
を処理することができ、この造粒物はサンドブラストの
代用砂，土建用砂として有効利用できると共に、溶融ス
ラグの有する顕熱を熱風として回収することができ、そ
の効果は大きい。(Effects of the Invention) According to the chromium-containing slag treatment method and the chromium-containing molten slag wind-blasting nozzle according to the present invention, it is possible to treat the chromium-containing slag with high hardness without pollution and disintegration. This granulated product can be effectively used as sand for sandblasting and sand for construction, and the sensible heat of the molten slag can be recovered as hot air, which is a great effect.
第１図および第２図は、それぞれクロム含有溶融スラグ
に添加物を投入する装置を示す図、 第３図は、クロム含有混合溶融スラグを風砕，造粒処理
する装置を示す図、 第４図は風砕ノズルの横断面図、 第５図は第４図の風砕ノズルＩ−Ｉ線における断面図で
ある。 １……電気炉、２……取鍋、３……滓鍋、４……ホッ
パ、５……コンベヤ、６……シュート、７……受滓容
器、８……流出シュート、９……風砕ノズル、10……風
砕スラグ収納容器、11……熱風回収用孔、12……開口
部、13……粒状混合物取出口、14……コンベヤ、15……
ホッパ、16……振動篩、91……中位ノズル、92……上位
ノズル、93……下位ノズル、94……整風板９、ａ……ク
ロム含融スラグ、ｂ……催溶剤、ｃ……混合溶融スラ
グ。FIG. 1 and FIG. 2 are diagrams showing an apparatus for adding an additive to chromium-containing molten slag, respectively. FIG. 3 is a diagram showing an apparatus for air-crushing and granulating chromium-containing mixed molten slag, and FIG. The drawing is a cross-sectional view of the air-crushing nozzle, and FIG. 5 is a cross-sectional view taken along line I-I of the air-crushing nozzle of FIG. 1 ... Electric furnace, 2 ... Ladle, 3 ... Slag pan, 4 ... Hopper, 5 ... Conveyor, 6 ... Chute, 7 ... Receiving container, 8 ... Outflow chute, 9 ... Wind Crushing nozzle, 10 …… Fracturing slag storage container, 11 …… Hot air recovery hole, 12 …… Opening part, 13 …… Granular mixture outlet, 14 …… Conveyor, 15 ……
Hopper, 16 ... Vibrating sieve, 91 ... Medium nozzle, 92 ... Upper nozzle, 93 ... Lower nozzle, 94 ... Air conditioning plate 9, a ... Chromium-containing slag, b ... Solvent, c ... … Mixed molten slag.
Claims (2)
入する時、SiO2,Al2O3を含む催溶剤を前記溶融スラグに
添加混合する工程、および （ロ） 前記混合溶融スラグを滓鍋から受滓容器へ注出
する際に、ノズルより空気を噴出してこの混合溶融スラ
グを風砕して造粒する工程、 の各工程からなるクロム含有スラグの無害化処理におい
て、 上記工程（イ）における催溶剤の添加量は、クロム含有
溶融スラグ100重量部に対し３〜20重量部とし、 上記工程（ロ）における風砕処理の当たっては、３つの
異なる開口形状の上位ノズル，中位ノズルおよび下位ノ
ズルからなる風砕用ノズルを用い、受滓容器に向けて注
出される混合溶融スラグを、上位ノズルより高速空気を
噴出させて風砕，造粒すると共に、中位ノズルより中速
空気を噴出させてさらに造粒しつつ冷却し、そして下位
ノズルより高速空気を噴出させて前記造粒スラグを風砕
スラグ収納容器内に吹き飛ばすこと、 を特徴とするクロム含有スラグの無害化処理方法。1. A step of: (a) adding a mixing solvent containing SiO 2 , Al 2 O 3 to the molten slag when pouring the molten slag containing chromium into the slag pan; and (b) adding the mixed molten slag. The step of detoxifying the chromium-containing slag, which consists of the steps of jetting air from the nozzle to air-mix the mixed molten slag and granulate it when pouring from the slag pan to the slag container, The amount of the solvent added in (a) is 3 to 20 parts by weight with respect to 100 parts by weight of the chromium-containing molten slag, and in the air crushing process in the step (b), there are three different upper shape nozzles having different opening shapes, Using the air-crushing nozzle consisting of the middle-level nozzle and the lower-level nozzle, the mixed molten slag poured toward the slag container is sprayed with high-speed air from the upper-level nozzle to be ground and granulated. Blow out medium speed air Cooled with granulation, and blowing off the granulated slag by jetting a high-speed air from the lower nozzles Kaze砕 slag storage container, detoxification method chromium containing slag, wherein.
有溶融スラグ流に対面して設けられる風砕用ノズルであ
って、このノズルは、開口断面形状が略Ｕ字形の中位ノ
ズルと、この中位ノズルのＵ字状内底部上に近接して開
口している、下向きに膨らむ湾曲形スリット開口をもつ
上位ノズルと、該中位ノズルの外底部下に近接して開口
している、平行スリット形の開口をもつ下位ノズルから
構成されており、かつＵ字形状の中位ノズルの開口部内
側には噴出方向に沿って配設された複数枚の整風板を具
え、そして中位，上位および下位の各ノズルの開口部の
面積は、Ｕ字状開口をもつ中位ノズルよりも、スリット
状開口をもつ上位ノズル，下位ノズルの方をそれぞれ小
さくしたことを特徴とするクロム含有溶融スラグ風砕用
ノズル。2. A blasting nozzle that is poured from a slag container and is provided so as to face a flowing chromium-containing molten slag flow, and the nozzle is an intermediate nozzle having an approximately U-shaped opening cross section. , An upper nozzle having a curved slit opening that bulges downward, which is opened close to the U-shaped inner bottom portion of the middle nozzle, and is opened close to the lower outer bottom portion of the middle nozzle. , A lower slit nozzle having parallel slit-shaped openings, and a plurality of air conditioning plates arranged along the ejection direction inside the opening of the U-shaped middle nozzle, and the middle nozzle , The area of the openings of the upper and lower nozzles is smaller than that of the middle nozzle having a U-shaped opening. Nozzle for slag dusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61094763A JP2525770B2 (en) | 1986-04-25 | 1986-04-25 | Method for detoxifying chromium-containing slag and nozzle for crushing chromium-containing molten slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61094763A JP2525770B2 (en) | 1986-04-25 | 1986-04-25 | Method for detoxifying chromium-containing slag and nozzle for crushing chromium-containing molten slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62252348A JPS62252348A (en) | 1987-11-04 |
| JP2525770B2 true JP2525770B2 (en) | 1996-08-21 |
Family
ID=14119136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61094763A Expired - Lifetime JP2525770B2 (en) | 1986-04-25 | 1986-04-25 | Method for detoxifying chromium-containing slag and nozzle for crushing chromium-containing molten slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2525770B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0028684A1 (en) * | 1979-09-06 | 1981-05-20 | Western Electric Company, Incorporated | Manufacture and aftertreatment of an article plated with gold, and article obtained thereby |
| JPS59109734U (en) * | 1982-12-29 | 1984-07-24 | 日本鋼管株式会社 | Air crushed slag production equipment |
| JPS613450U (en) * | 1984-06-13 | 1986-01-10 | オリオン機械株式会社 | Constant temperature environmental test equipment |
-
1986
- 1986-04-25 JP JP61094763A patent/JP2525770B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62252348A (en) | 1987-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2234223C (en) | Quenching fused materials | |
| US4359434A (en) | Process for granulating molten material | |
| TWI390025B (en) | Abrasive material made of atomized slag, manufacturing facility and method for the same | |
| JP5640307B2 (en) | Blasting abrasive and method for producing blasting abrasive. | |
| JP2525770B2 (en) | Method for detoxifying chromium-containing slag and nozzle for crushing chromium-containing molten slag | |
| CN106755660A (en) | A kind of foamed slag dilute phase dry granulation methods based on steel mill's solid waste melting and reducing | |
| US4113481A (en) | Green balls formed by agglomerating wet-collected fume produced in metallurgical furnaces | |
| JP2004238276A (en) | Method for producing high carbon ferrochrome air granulated slag and grinding material | |
| US4449566A (en) | Foundry sand reclamation | |
| JP4367330B2 (en) | Fused granulator for molten slag | |
| GB1582322A (en) | Method of granulating molten metallurgical slag | |
| KR20020033008A (en) | Method for recovering useful metal from slag generated in steel-making process while treating the slag | |
| CN112226556B (en) | Recycling method of converter steel slag or blast furnace steel slag | |
| CN100563977C (en) | The separation method of mixed waste plastic | |
| USRE30795E (en) | Green balls formed by agglomerating wet-collected fume produced in metallurgical furnaces | |
| JPS5953613A (en) | Method and device for treating steel making slag | |
| JP4012344B2 (en) | Method for producing blast furnace slag fine aggregate | |
| KR20140001635A (en) | Lf slag ball flux recyclable in steel- making and method for manufacturing the same | |
| JPS61231108A (en) | Production of steel shot | |
| JP4411631B2 (en) | Industrial waste recycling and collection method using shot blasting and industrial waste recycling and recovery equipment used in the method | |
| JP2018066046A (en) | Manufacturing method of sintered ore | |
| EP0074755B1 (en) | Process for the reclamation of foundry sands | |
| JPS5932535B2 (en) | Method for improving slag properties | |
| JPS5934143B2 (en) | Slag cooling device | |
| CZ2021209A3 (en) | Method of processing molten metallurgical slag |