JPH11236255A - Production of coarse-grained hard watergranulated blast furnace slag - Google Patents
Production of coarse-grained hard watergranulated blast furnace slagInfo
- Publication number
- JPH11236255A JPH11236255A JP3939498A JP3939498A JPH11236255A JP H11236255 A JPH11236255 A JP H11236255A JP 3939498 A JP3939498 A JP 3939498A JP 3939498 A JP3939498 A JP 3939498A JP H11236255 A JPH11236255 A JP H11236255A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- water
- granulated
- granulated slag
- blast furnace
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コンクリート用高
炉水砕スラグ細骨材の製造方法に関し、特に、粗粒のコ
ンクリート用高炉水砕スラグ細骨材の製造が可能な粗粒
硬質水砕スラグの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing granulated granulated blast furnace slag for concrete, and more particularly to a granulated hard granulated slag capable of producing granulated granulated granulated blast furnace slag for concrete. And a method for producing the same.
【０００２】[0002]
【従来の技術】高炉スラグは、日本だけでも年間約2300
万ton の発生量があるが、その内の６割強の1400万ton
以上が、溶融状態のスラグに水を直接吹き付けて急冷す
る吹製法によって製造される水砕スラグである。この場
合、水としては、一般的に循環水を使用するが、水質と
しては、製造した水砕スラグ中に残留し水砕スラグの使
用に際して悪影響を及ぼす成分を含まないものであれば
良い。[Prior Art] Blast furnace slag is about 2,300 annually in Japan alone.
Of which are 14 million tons, of which more than 60%
The above is the granulated slag produced by the blowing method in which water is directly blown onto the molten slag and rapidly cooled. In this case, circulating water is generally used as the water, and the quality of the water may be any water that does not contain components that remain in the manufactured granulated slag and adversely affect the use of the granulated slag.
【０００３】水砕スラグは、その性状によって、セメン
ト原料向けの軟質水砕スラグとコンクリート用細骨材向
けの硬質水砕スラグとに区別される。コンクリート用細
骨材向けの硬質水砕スラグの規格は、JIS A 5011に規定
されている。硬質水砕スラグ製造方法として現在採用さ
れている方式は、一旦スラグをスラグ鍋に受けた後、高
炉とは別の場所に設けられた水砕設備で水砕する炉外方
式と、高炉に直結した軟質水砕製造設備で製造した水砕
スラグの中から高比重のスラグを選別する炉前方式の２
方式で実施されている。[0003] Granulated slag is classified into soft granulated slag for cement raw materials and hard granulated slag for fine aggregate for concrete according to its properties. The standard of hard granulated slag for fine aggregate for concrete is specified in JIS A 5011. The method currently used as a method for manufacturing hard granulated slag is as follows: once the slag is placed in a slag pot, and then granulated by a granulation facility provided in a location separate from the blast furnace. Of a furnace-front method that sorts slag with high specific gravity from granulated slag produced by the soft granulated production facility
It has been implemented in a scheme.
【０００４】硬質水砕スラグをコンクリート用細骨材と
して利用する際、硬質水砕スラグのみで使用することは
少ない。すなわち、一般的には、天然砂に硬質水砕スラ
グを一部混合して用いる。これは、硬質水砕スラグは水
硬性を有し、保存中に水分と反応し、固結してしまうと
いう問題があるためであり、硬質水砕スラグ単独では長
期保存に適さないことによる。[0004] When hard granulated slag is used as fine aggregate for concrete, it is rare to use only hard granulated slag. That is, in general, hard granulated slag is partially mixed with natural sand for use. This is due to the problem that hard granulated slag has hydraulic properties, reacts with moisture during storage and solidifies, and hard granulated slag alone is not suitable for long-term storage.
【０００５】細骨材の粒度分布はJIS で規格が決められ
ており、天然砂のみではその規格を満足できない場合が
多く、砕砂などを混合して粒度分布を調整している。硬
質水砕スラグは砕砂などの代替として利用され、天然砂
の粒度に応じた粒度が求められる。すなわち、天然砂の
粒度が細粒のときは粗粒のもの、天然砂の粒度が粗粒の
ときは細粒のものが求められる。The particle size distribution of fine aggregate is determined by JIS, and in many cases, the standard cannot be satisfied only with natural sand, and the particle size distribution is adjusted by mixing crushed sand or the like. Hard granulated slag is used as a substitute for crushed sand and the like, and a grain size corresponding to the grain size of natural sand is required. That is, when the particle size of the natural sand is fine, coarse particles are required, and when the particle size of the natural sand is coarse, fine particles are required.
【０００６】細粒の硬質水砕スラグが求められるとき
は、硬質水砕スラグを破砕、粒度調整することによっ
て、要求品質を容易に満足できる。しかし、粗粒の硬質
水砕スラグが求められる時は、原滓の粒度を粗粒化して
おく必要がある。硬質水砕スラグを粗粒化する方法に関
して言及した従来技術はないが、硬質水砕スラグと軟質
水砕スラグを作り分ける装置、方法として、特公平6-39
340 号公報が開示されている。When fine granulated hard granulated slag is required, the required quality can be easily satisfied by crushing the hard granulated slag and adjusting the particle size. However, when coarse granulated hard granulated slag is required, it is necessary to coarsen the particle size of the raw slag. There is no prior art which mentions a method of coarsely granulating hard granulated slag, but as a device and method for separately producing hard granulated slag and soft granulated slag, Japanese Patent Publication No. 6-39
No. 340 is disclosed.
【０００７】該公報中においては、スラグ冷却用の吹製
水の噴射ノズルを４ヵ所のノズルに分け、それぞれのノ
ズルの水圧を独立制御できる構造を採用し、粒化用ノズ
ルと称する溶融スラグに最初に当たる冷却水のノズルの
水圧を低下させると粒度が粗くなることが記述されてい
る。しかし、上記した方法の場合、設備が複雑となりま
た各噴射ノズルの水圧をそれぞれ適切な範囲に制御する
必要があり、設備的、操業管理上、簡易な設備で効率良
く硬質水砕スラグを粗粒化する方法が求められていた。[0007] In this publication, the injection nozzle for blowing water for cooling slag is divided into four nozzles, and a structure capable of independently controlling the water pressure of each nozzle is adopted. It is described that the particle size becomes coarse when the water pressure of a cooling water nozzle which is first hit is reduced. However, in the case of the above-mentioned method, the equipment becomes complicated, and it is necessary to control the water pressure of each injection nozzle within an appropriate range.In terms of equipment and operation management, the hard granulated slag is efficiently granulated with simple equipment. There was a need for a way to make it more sophisticated.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、前記した従
来技術の問題点を解決し、複雑な設備を必要とすること
なく、簡易な設備で効率良く粗粒の硬質水砕スラグを製
造することが可能な粗粒硬質水砕スラグの製造方法を提
供することを目的とする。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and efficiently manufactures coarse-grained hard granulated slag with simple equipment without requiring complicated equipment. It is an object of the present invention to provide a method for producing coarse-grained hard granulated slag that can be used.
【０００９】[0009]
【課題を解決するための手段】第１の発明は、溶融高炉
スラグを水で急冷し、硬質水砕スラグを製造する際に、
冷却水温度：60〜80℃で吹製することを特徴とする粗粒
硬質水砕スラグの製造方法である。第２の発明は、溶融
高炉スラグを水で急冷し、硬質水砕スラグを製造する際
に、冷却水温度が60〜80℃の範囲内となるように水温調
節して吹製することを特徴とする粗粒硬質水砕スラグの
製造方法である。Means for Solving the Problems The first invention is to rapidly cool a molten blast furnace slag with water to produce hard granulated slag.
This is a method for producing coarse-grained hard granulated slag characterized by blowing at a cooling water temperature of 60 to 80 ° C. The second invention is characterized in that when the molten blast furnace slag is quenched with water and hard granulated slag is produced, the water temperature is adjusted so that the cooling water temperature is in the range of 60 to 80 ° C, and blown. This is a method for producing a coarse-grained hard granulated slag.
【００１０】前記した第１の発明、第２の発明において
は、前記した粗粒硬質水砕スラグの製造方法として、炉
前方式の水砕スラグの製造方法を適用すると共に、前記
した条件にさらに加えて、冷却水流量(t−冷却水／hr)
／溶融高炉スラグ流量(t−スラグ／hr) ≧30、かつ水砕
槽内水温≦95℃の条件下で吹製することが好ましい。ま
た、この場合、冷却水流量および水砕スラグ製造量を測
定し、水砕スラグ製造量から溶融高炉スラグ流量を求
め、冷却水流量(t−冷却水／hr) ／溶融高炉スラグ流量
(t−スラグ／hr) ≧30の条件下で吹製することが好まし
い。In the first and second aspects of the present invention, a method for producing granulated hard slag of a furnace front type is applied as a method for producing a coarse-grained hard granulated slag, and the above-described conditions are further satisfied. In addition, cooling water flow rate (t-cooling water / hr)
/ Molten blast furnace slag flow rate (t-slag / hr) ≧ 30 and water temperature in the granulation tank ≦ 95 ° C. It is preferable to blow-blowing. In this case, the flow rate of the cooling water and the production amount of the granulated slag were measured, and the flow rate of the molten blast furnace slag was determined from the production amount of the granulated slag, and the cooling water flow rate (t-cooling water / hr) / the molten blast furnace slag flow rate
(t-slag / hr).
【００１１】[0011]
【発明の実施の形態】以下、本発明をさらに詳細に説明
する。本発明者らは、先ず、一般的な軟質水砕スラグ製
造設備における製造条件と水砕スラグの粒度との関係を
調査した。すなわち、水砕スラグを水切り後、ホッパま
で輸送する途中で、10分毎に水砕スラグを採取し、乾燥
後の粒度分布を測定した。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The present inventors first investigated the relationship between the production conditions and the particle size of the granulated slag in a general soft granulated slag production facility. That is, after draining the granulated slag, the granulated slag was sampled every 10 minutes while being transported to the hopper, and the particle size distribution after drying was measured.
【００１２】得られた測定結果に基づき、粗粒率（F.M.
値）とスラグ温度、スラグ流量、水／スラグ比、冷却水
温度（：吹製水温度）などとの関係を調査した。なお、
上記した冷却水温度（：吹製水温度）は、溶融高炉スラ
グに噴出する冷却水の温度で、冷水槽15の箇所で測定し
た水温である。また、上記した粗粒率（F.M.値）とは、
目開きが80,40,20,10,５，2.5,1.2,0.6,0.3,0.15mmの篩
で水砕砂（：水砕スラグ）を篩別けし、各篩上に残留す
る水砕砂の残留累計百分率を合計し、この値を100 で割
った値で定義される。Based on the measurement results obtained, the coarse grain ratio (FM
Values) and slag temperature, slag flow rate, water / slag ratio, cooling water temperature (: blowing water temperature), and the like. In addition,
The above-mentioned cooling water temperature (: blowing water temperature) is the temperature of the cooling water jetted to the molten blast furnace slag, and is the water temperature measured at the cold water tank 15. The above-mentioned coarse grain ratio (FM value)
Aggregate is 80,40,20,10,5,2.5,1.2,0.6,0.3,0.15mm Sieve granulated sand (: granulated slag) with a sieve, and the cumulative total of granulated sand remaining on each sieve It is defined as the sum of percentages and this value divided by 100.
【００１３】その結果、図５に示す冷却水温度と粗粒率
との関係が得られ、冷却水温度が高くなると粗粒率が大
きくなることが分かった。特に、冷却水温度が60℃以上
において粗粒率が3.2 を超え、粒度が急激に大きくな
る。その他の調査項目と粗粒率とは明確な関係がなかっ
た。As a result, the relationship between the cooling water temperature and the coarse particle ratio shown in FIG. 5 was obtained, and it was found that the higher the cooling water temperature, the higher the coarse particle ratio. In particular, when the cooling water temperature is 60 ° C or higher, the coarse particle ratio exceeds 3.2, and the particle size sharply increases. There was no clear relationship between the other survey items and the coarse grain ratio.
【００１４】ただし、図５に示すように、軟質水砕スラ
グ製造設備においては、硬質水砕スラグに相当する比重
（：単位容積質量≧1.35kg/l) のもの（図中：○）と、
比重が小さく（：単位容積質量＜1.35kg/l) 、硬質水砕
スラグにならないもの（図中：●）とがある。冷却水温
度が40℃以下と低いと硬質水砕スラグになり易く、冷却
水温度が80℃を超えると硬質水砕スラグにならない。However, as shown in FIG. 5, the soft granulated slag production equipment has a specific gravity (: unit volume mass ≧ 1.35 kg / l) corresponding to hard granulated slag (in the figure: ○).
Some have low specific gravity (: unit mass <1.35 kg / l) and do not become hard granulated slag (in the figure: ●). If the cooling water temperature is as low as 40 ° C. or lower, hard granulated slag tends to be formed, and if the cooling water temperature exceeds 80 ° C., hard granulated slag is not formed.
【００１５】一方、冷却水温度が60〜80℃の範囲では、
硬質水砕スラグと軟質水砕スラグが混在しており、粒度
の粗い水砕スラグが得られる水温条件である。このた
め、本発明の方法を炉前方式に適用して粗粒の硬質水砕
スラグを製造するためには、高比重の水砕スラグを製造
することが必要となる。本発明者らは、炉前方式におけ
る水砕スラグ吹製時の冷却水（：吹製水）流量(t−冷却
水／hr) ／溶融高炉スラグ流量(t−スラグ／hr) （以
下、水／スラグ比と記す）と水砕スラグの単位容積質量
との関係を調査した結果、図３に示すように、水／スラ
グ比≧30の条件下で単位容積質量≧1.35kg/lを達成でき
ることを見出した。On the other hand, when the cooling water temperature is in the range of 60 to 80 ° C.,
Hard granulated slag and soft granulated slag are mixed, and the water temperature is such that granulated slag having a coarse particle size can be obtained. Therefore, in order to apply the method of the present invention to the pre-furnace method to produce coarse hard granulated slag, it is necessary to produce granulated slag having a high specific gravity. The present inventors have proposed a flow rate of cooling water (blown water) (t-cooling water / hr) / flow rate of molten blast furnace slag (t-slag / hr) when blowing granulated slag in the pre-furnace method. / Slag ratio) and the unit volume mass of the granulated slag were investigated. As shown in FIG. 3, the unit volume mass ≧ 1.35 kg / l was achieved under the condition of water / slag ratio ≧ 30. Was found.
【００１６】一方、水／スラグ比が30以上であっても、
水砕槽内の水温が95℃を超えた場合、図４に示すように
単位容積質量は低下する。この理由は、下記の現象によ
るもの考えられる。高炉水砕スラグの単位容積質量すな
わち嵩比重は、２つの要因によって決まる。On the other hand, even if the water / slag ratio is 30 or more,
When the water temperature in the granulator exceeds 95 ° C., the unit mass decreases as shown in FIG. The reason may be due to the following phenomenon. The unit mass of the granulated blast furnace slag, that is, the bulk specific gravity, is determined by two factors.
【００１７】１つは水砕スラグ中の閉気孔の存在量であ
り、もう１つは粒度分布、外観性状によるものである。
閉気孔の存在量は、水砕スラグそのものの密度である絶
乾比重（見掛け密度）を左右し、この閉気孔内には従来
の研究結果では、水素ガスと窒素ガスの混合ガスが存在
していることが知られている。One is the amount of closed pores in the granulated slag, and the other is due to the particle size distribution and appearance.
The amount of closed pores affects the absolute density (apparent density), which is the density of the granulated slag itself. According to previous research results, a mixed gas of hydrogen gas and nitrogen gas was present in these closed pores. Is known to be.
【００１８】本発明者らの測定結果でも、Ｈ2 ：Ｎ2 ＝
３：１の比で存在することがわかった。この閉気孔は、
溶融スラグの冷却時にスラグと接触した水が水蒸気とな
りスラグ中に溶解し、スラグ中の溶解窒素と反応して生
成した水素ガスと窒素ガスの混合ガスによるものであ
る。According to the measurement results of the present inventors, H 2 : N 2 =
It was found to be present in a 3: 1 ratio. This closed pore
Water that comes into contact with the slag at the time of cooling the molten slag becomes steam and dissolves in the slag, and is caused by a mixed gas of hydrogen gas and nitrogen gas generated by reacting with dissolved nitrogen in the slag.
【００１９】このことから、水砕直後の水とスラグが共
存している水砕槽で、水温が95℃を超える条件の場合、
吹製冷却時の水蒸気発生量も多く、冷却後の閉気孔の存
在量が多くなるため、絶乾比重が低下し、単位容積質量
が低下する。したがって、本発明においては、水砕槽の
水温が95℃以下であることが好ましい。From this fact, in a granulation tank where water and slag coexist immediately after granulation, when the water temperature exceeds 95 ° C.,
Since a large amount of steam is generated during blow-blowing cooling and the amount of closed pores after cooling increases, the absolute specific gravity decreases and the unit volume mass decreases. Therefore, in the present invention, the water temperature of the granulation tank is preferably 95 ° C. or lower.
【００２０】なお、本発明における水砕槽とは、水砕ス
ラグ製造設備における水砕後のスラグと水の混合物の受
槽を示す。以上述べたように、本発明の方法を炉前方式
に適用して粗粒の硬質水砕スラグを製造するためには、
前記で定義した水／スラグ比が30以上、水砕槽の水温が
95℃以下であることが好ましい。The term “water granulation tank” in the present invention refers to a tank for receiving a mixture of slag and water after granulation in a granulated slag production facility. As described above, in order to apply the method of the present invention to the pre-furnace method to produce coarse-grained hard granulated slag,
The water / slag ratio defined above is 30 or more, and the water temperature of the granulation tank is
Preferably it is 95 ° C or lower.
【００２１】[0021]
【実施例】以下、本発明を実施例に基づいてさらに具体
的に説明する。高炉に直結した軟質水砕スラグ製造設備
で製造した水砕スラグの高比重のスラグを選別する炉前
方式（実施例１）、および、一旦スラグをスラグ鍋に受
けた後、高炉とは別の場所に設けられた水砕設備で水砕
する炉外方式（実施例２）の２方式で本発明を実施し
た。EXAMPLES The present invention will be described below more specifically based on examples. Pre-furnace method to sort slag with high specific gravity of granulated slag produced by a soft granulated slag production facility directly connected to a blast furnace (Example 1), and after once receiving slag in a slag pan, separate from the blast furnace The present invention was carried out by two methods, an out-of-furnace method (Example 2) in which water was granulated by a water granulation facility provided at the place.
【００２２】（実施例１）前記した炉前方式において本
発明を実施した。図６に、本発明を実施した炉前方式の
水砕スラグ製造設備の概要を、側面図によって示す。図
６において、１は高炉、２は出銑口、３は出銑樋、４は
スラグ樋、５は冷却水（：吹製水）噴射ノズル、６は吹
製函、７は冷却水（：吹製水）、８は水砕槽、９は煙
突、10は温水槽、11は円筒状のフィルタ11a を有する回
転水切り装置、12はディストリビュータ、13a,13b はベ
ルトコンベア、14は熱電対、15は冷水槽、16は冷却塔、
17は秤量装置、18ａ，18b は製品ホッパ、19は切り換え
用ダンパ、20,30 は送液ポンプ、21は流量調節弁、22は
冷却水（：吹製水）の流量計、23は制御装置、31a は送
液配管、31b は送液バイパス配管、32a,32b は切り換え
弁、ｆ1 は溶融高炉スラグの流れ方向、ｆ2 は冷却
水（：吹製水）の流れ方向、ｆ 3 は水砕スラグの移送方
向、ｆ4 は補給水の流れ方向を示す。(Embodiment 1) In the above-mentioned furnace front system,
The invention has been implemented. FIG. 6 shows a pre-furnace method according to the present invention.
The outline of the granulated slag production facility is shown by a side view. Figure
In 6, 6, 1 is a blast furnace, 2 is a tap hole, 3 is a tapping gutter, 4 is
Slug gutter, 5 is a cooling water (: blowing water) spray nozzle, 6 is a blow
Box making, 7 is cooling water (: blowing water), 8 is a granulation tank, 9 is smoke
, 10 is a hot water tank, 11 is a circuit having a cylindrical filter 11a.
Drainer, 12 for distributor, 13a, 13b for base
Conveyor, 14 is a thermocouple, 15 is a cold water tank, 16 is a cooling tower,
17 is a weighing device, 18a and 18b are product hoppers, 19 is a switch
Dampers, 20 and 30 are liquid feed pumps, 21 is a flow control valve, 22 is
Cooling water (blowing water) flow meter, 23 is a control unit, 31a is
Liquid piping, 31b is liquid supply bypass piping, 32a, 32b is switchable
Valve, f1Is the flow direction of the molten blast furnace slag, fTwoIs cooling
Flow direction of water (blowing water), f ThreeIs how to transfer granulated slag
Direction, fFourIndicates the flow direction of makeup water.
【００２３】図６に示す水砕スラグ製造設備において
は、吹製函６から落下する溶融スラグに冷却水（：吹製
水）７を吹き付けて水砕後、冷却固化したスラグが水と
共に水砕槽８に入る。その後、回転水切り装置11の円筒
状のフィルタ11a で水砕スラグと水を分離した後、水砕
スラグを製品ホッパ18a,18b までベルトコンベア13a,13
b で輸送する。In the granulated slag manufacturing equipment shown in FIG. 6, cooling water (blown water) 7 is sprayed on the molten slag falling from the blowing box 6 to granulate the water, and the cooled and solidified slag is granulated together with the water. Enter tank 8. Then, after the granulated slag and water are separated by the cylindrical filter 11a of the rotary draining device 11, the granulated slag is transferred to the product hoppers 18a, 18b by the belt conveyors 13a, 13b.
Transport by b.
【００２４】ベルトコンベア13b の途中には秤量装置17
が設けられており、連続的に水砕スラグの製造量を測定
する。ベルトコンベア13a,13b 上の水砕スラグは水分が
高く、この水分量を差し引いた値が、出銑口２から排出
された実際の溶融高炉スラグ流量となる。上記した溶融
高炉スラグ流量は、回転水切り装置11で水切り後の水砕
スラグ中の水分含有比率が水砕スラグの製造量や吹製水
量を変化させてもそれほど変化しないため、予め水切り
後のスラグの水分含有比率を測定して補正値を決定し、
制御装置23において、水砕スラグ製造量から一定比率の
水分量を差し引く補正を行うことによって求めた。In the middle of the belt conveyor 13b, a weighing device 17 is provided.
Is provided, and the production amount of granulated slag is continuously measured. The granulated slag on the belt conveyors 13a and 13b has high water content, and the value obtained by subtracting the water content is the actual flow rate of the molten blast furnace slag discharged from the taphole 2. The above-mentioned molten blast furnace slag flow rate, the water content ratio in the granulated slag after draining by the rotary draining device 11 does not change so much even if the production amount and the blowing water amount of the granulated slag are changed. Determine the correction value by measuring the water content ratio of
It was obtained by performing a correction in the controller 23 by subtracting a certain percentage of water content from the granulated slag production volume.
【００２５】水砕スラグと分離された水は温水槽10に溜
まり、冷却塔16に送液ポンプ30で送られ冷却され、冷却
後の水は冷水槽15に蓄えられる。本発明の方法を実施し
た際、高炉出銑量は7800〜8000ton/day 、スラグ比は約
320kg/ton-pig 、出銑温度は1495〜1505℃であった。本
発明の方法を炉前方式に適用して粗粒の硬質水砕スラグ
を製造するためには、前記したように、高比重の水砕ス
ラグを製造することが必要となる。The water separated from the granulated slag accumulates in the hot water tank 10, is sent to the cooling tower 16 by the liquid sending pump 30 and is cooled, and the cooled water is stored in the cold water tank 15. When the method of the present invention was carried out, the blast furnace tapping rate was 7800 to 8000 ton / day, and the slag ratio was about
320 kg / ton-pig, tapping temperature was 1495 to 1505 ° C. In order to apply the method of the present invention to the pre-furnace method to produce coarse-grained hard granulated slag, it is necessary to produce granulated slag having a high specific gravity as described above.
【００２６】そのため、本実施例においては、本発明者
らが見出した前記した硬質高炉水砕スラグの製造条件に
基づいて高比重の水砕スラグを製造した。すなわち、硬
質水砕スラグの製造条件として、冷却水（：吹製水）流
量／溶融高炉スラグ流量〔：水／スラグ比〕≧30、水砕
槽８の水温≦95℃とした。なお、冷却水（：吹製水）流
量は、水噴射ノズル５から噴射される冷却水の単位時間
当たりの噴射量を示し、溶融高炉スラグ流量は、スラグ
樋４から吹製函６へ供給される溶融高炉スラグ流量を示
し、前記した方法によって求めた。Therefore, in the present embodiment, granulated slag having a high specific gravity was manufactured based on the above-described manufacturing conditions of the hard blast furnace granulated slag found by the present inventors. That is, the production conditions of the hard granulated slag were as follows: cooling water (blowing water) flow rate / melting blast furnace slag flow rate [water / slag ratio] ≧ 30, and water temperature of the granulation tank 8 ≦ 95 ° C. The flow rate of the cooling water (blowing water) indicates the amount of cooling water injected from the water injection nozzle 5 per unit time, and the flow rate of the molten blast furnace slag is supplied from the slag gutter 4 to the blowing box 6. And the flow rate of the molten blast furnace slag.
【００２７】本設備の場合、吹製函６においてスラグが
水砕されてから秤量装置17まで到達するのに約３分の時
間を要し、秤量値から水分を引いた値が、３分前の溶融
高炉スラグ流量となる。本設備は、前記したように製品
ホッパを２基（：製品ホッパ18a 、製品ホッパ18b ）装
備しており、出銑初期に下記条件下で硬質水砕スラグを
製造し、製品ホッパ18a に投入した後、切り換え用ダン
パ19によってホッパを切り換え、出銑後期に製造した軟
質水砕スラグを製品ホッパ18b に投入した。In the case of this equipment, it takes about 3 minutes for the slag to reach the weighing device 17 after the slag is granulated in the blow box 6, and the value obtained by subtracting the moisture from the weighed value is 3 minutes before. Of the molten blast furnace slag. This equipment is equipped with two product hoppers (product hopper 18a and product hopper 18b) as described above, and produces hard granulated slag under the following conditions in the early stage of tapping and puts it into product hopper 18a. Thereafter, the hopper was switched by the switching damper 19, and the soft granulated slag produced in the latter half of tapping was put into the product hopper 18b.
【００２８】具体的には、冷却水流量（：吹製水流量）
を50m3/minの条件に設定して吹製を開始し、製造した高
比重の水砕スラグを製品ホッパ18a に貯留し、溶融高炉
スラグ流量が増加し平均1.7ton/minに到達した時点で、
制御装置23からの信号によって切り換え用ダンパ19を駆
動し、投入する製品ホッパを製品ホッパ18b に切り換え
た。Specifically, the flow rate of cooling water (the flow rate of blowing water)
Was set to the condition of 50 m 3 / min and started blowing, the granulated slag of high specific gravity produced was stored in the product hopper 18a, and when the molten blast furnace slag flow increased and reached an average of 1.7 ton / min ,
The switching damper 19 was driven by a signal from the control device 23, and the product hopper to be charged was switched to the product hopper 18b.
【００２９】冷却水（：吹製水）７の温度の調節は、冷
却水温度を下げる場合は、冷却塔16を通過させ、冷却水
温度を上げるときは、冷却塔ファン16a を停止し、温水
槽10から冷水槽15への送液バイパス配管31b を通過させ
ることによって行った。なお、本実施例においては、冷
却水７の温度が80℃を超えると、水砕槽８の水温が95℃
以上となり、上記した冷却水７の温度調節の結果、硬質
スラグ製造中は、水砕槽８の温度は95℃を超えることは
なかった。The temperature of the cooling water (blowing water) 7 is adjusted by passing the cooling water through the cooling tower 16 when lowering the cooling water temperature, and stopping the cooling tower fan 16a when raising the cooling water temperature. This was performed by passing the liquid from the water tank 10 to the cold water tank 15 through a liquid sending bypass pipe 31b. In this embodiment, when the temperature of the cooling water 7 exceeds 80 ° C., the water temperature of the granulation tank 8 becomes 95 ° C.
As described above, as a result of the temperature adjustment of the cooling water 7, the temperature of the granulation tank 8 did not exceed 95 ° C. during the production of the hard slag.
【００３０】なお、上記した冷却水７の温度（：吹製水
温度）は、溶融高炉スラグに噴出する冷却水の温度で、
冷水槽15の箇所で測定した水温である。図１に、硬質ス
ラグ製造中の冷却水温度と製品ホッパ18a から抜き出し
た硬質水砕スラグの粗粒率との関係を示す。冷却水温度
は、硬質水砕スラグ製造中、徐々に上昇するため線で範
囲を表し、中間の温度と粗粒率との関係をプロットし
た。The temperature of the cooling water 7 (blowing water temperature) is the temperature of the cooling water jetted to the molten blast furnace slag.
This is the water temperature measured at the location of the cold water tank 15. FIG. 1 shows the relationship between the cooling water temperature during the production of hard slag and the coarse particle ratio of the hard granulated slag extracted from the product hopper 18a. The cooling water temperature gradually increased during the production of the hard granulated slag, and was represented by a line, and the relationship between the intermediate temperature and the coarse particle ratio was plotted.
【００３１】図１に示されるように、冷却水温度が低い
場合（比較例）、粗粒率が低いが、本発明の方法にした
がって、冷却水温度を60〜80℃と調節することによっ
て、粗粒率の高い硬質水砕スラグが得られた（本発明
例）。なお、図１に示す本発明例および比較例で製造し
た硬質水砕スラグは、いずれも、単位容積質量が1.35kg
/l以上であり、得られた硬質水砕スラグを破砕し、粒度
調整することによって、いずれの硬質水砕スラグも単位
容積質量が1.45kg/l以上の硬質水砕スラグ規格を満足し
た。As shown in FIG. 1, when the cooling water temperature is low (Comparative Example), the coarse particle ratio is low, but by adjusting the cooling water temperature to 60 to 80 ° C. according to the method of the present invention, Hard granulated slag having a high coarse particle ratio was obtained (Example of the present invention). The hard granulated slag produced in the present invention example and the comparative example shown in FIG. 1 each had a unit volume mass of 1.35 kg.
/ l or more, and by crushing the obtained hard granulated slag and adjusting the particle size, each of the hard granulated slags satisfied the hard granulated slag standard having a unit mass of 1.45 kg / l or more.
【００３２】（実施例２）前記した炉外方式において本
発明を実施した。図７に、本発明を実施した炉外方式の
水砕スラグ製造設備の概要を、側面図によって示す。図
７において、50はスラグ鍋、51は溶融高炉スラグ、52は
タンディッシュ、53はコールドランナー、54は冷却
水（：吹製水）、55は水噴射ノズル、56は製品スラグを
示す。(Example 2) The present invention was carried out in the above-mentioned out-of-furnace method. FIG. 7 is a side view showing an outline of an out-of-furnace type granulated slag manufacturing facility in which the present invention is implemented. In FIG. 7, reference numeral 50 denotes a slag pot, 51 denotes a molten blast furnace slag, 52 denotes a tundish, 53 denotes a cold runner, 54 denotes cooling water (blowing water), 55 denotes a water injection nozzle, and 56 denotes a product slag.
【００３３】スラグ冷却ヤードに図７に示すタンディッ
シュ52、コールドランナー53、水噴射ノズル55を配設
し、硬質水砕スラグの製造試験を実施した。冷却水の温
度調節を行う冷水槽、温水槽、冷却塔、送液ポンプは、
前記した炉前方式の設備を利用し、配管を延長し、水噴
射ノズル55に接続して試験を行った。A tundish 52, a cold runner 53 and a water injection nozzle 55 shown in FIG. 7 were provided in a slag cooling yard, and a hard granulated slag production test was performed. The cold water tank, hot water tank, cooling tower, and liquid transfer pump that control the temperature of the cooling water
The test was conducted by using the above-mentioned furnace-front equipment, extending the piping, and connecting to the water injection nozzle 55.
【００３４】冷却水（：吹製水）54の温度の調節は前記
した実施例１の炉前方式と同様の方法で行った。スラグ
流量は、予め求めたタンディッシュ口径と流出速度との
関係に基づき、所定のタンディッシュ口径に設定し、約
2ton/minで一定になるようにした。水噴射ノズル55から
噴射する冷却水の流量は、40m3/min（一定）とし、鍋か
らの排滓量は30ton ／回とした。The temperature of the cooling water (blowing water) 54 was adjusted in the same manner as in the furnace front method of the first embodiment. The slag flow rate is set to a predetermined tundish diameter based on the relationship between the tundish diameter and the outflow velocity obtained in advance, and
It was made constant at 2 ton / min. The flow rate of the cooling water injected from the water injection nozzle 55 was 40 m 3 / min (constant), and the amount of waste from the pot was 30 tons / time.
【００３５】図２に、硬質スラグ製造中の冷却水（：吹
製水）54の温度と回収した硬質水砕スラグの粗粒率との
関係を示す。なお、冷却水（：吹製水）54の温度は、冷
水槽15で測定した、コールドランナー53に吹き込まれる
前の水温である。図２に示されるように、冷却水温度が
低い場合（比較例）、粗粒率が低いが、本発明の方法に
したがって、冷却水温度を60〜80℃と調節することによ
って、粗粒率の高い硬質水砕スラグが製造可能となった
（本発明例）。FIG. 2 shows the relationship between the temperature of the cooling water (blowing water) 54 during the production of hard slag and the coarse particle ratio of the collected hard granulated slag. The temperature of the cooling water (blowing water) 54 is the temperature of the water before being blown into the cold runner 53, measured in the cold water tank 15. As shown in FIG. 2, when the cooling water temperature is low (Comparative Example), the coarse particle ratio is low, but by adjusting the cooling water temperature to 60 to 80 ° C. according to the method of the present invention, the coarse particle ratio is reduced. A hard granulated slag with high hardness can be manufactured (Example of the present invention).
【００３６】また、図１、図２に示されるように、炉外
水砕方式の方が、炉前水砕方式に比べて、粒度の粗い硬
質水砕スラグが製造可能であった。これは、炉外方式の
場合、一旦鍋にスラグを受けるため、水砕前のスラグ温
度が低く、より粗いものが得られると推定される。Also, as shown in FIGS. 1 and 2, hard granulated slag having a coarser grain size could be produced by the out-of-furnace granulation method than by the pre-furnace granulation method. This is presumed that, in the case of the out-of-furnace method, since the slag is once received in the pot, the slag temperature before granulation is low, and a coarser slag can be obtained.
【００３７】[0037]
【発明の効果】本発明によれば、複雑な設備を必要とす
ることなく、簡易な設備で効率良く粗粒の硬質水砕スラ
グを製造することが可能となった。また、既設の水砕ス
ラグ製造設備に対しても、大幅な設備改造が不要で、冷
却水温度を規定範囲内に制限することによって、粗粒の
硬質水砕スラグを製造することが可能となった。According to the present invention, it is possible to efficiently produce coarse-grain hard granulated slag with simple equipment without requiring complicated equipment. Also, no major equipment modification is required for existing granulated slag production equipment, and it is possible to produce coarse-grained hard granulated slag by limiting the cooling water temperature within the specified range. Was.
【図１】炉前方式における、硬質水砕スラグ製造中の冷
却水温度と硬質水砕スラグの粗粒率（F.M.値）との関係
を示すグラフである。FIG. 1 is a graph showing the relationship between the cooling water temperature during hard granulated slag production and the coarse particle ratio (FM value) of the hard granulated slag in the furnace front method.
【図２】炉外方式における、硬質水砕スラグ製造中の冷
却水温度と硬質水砕スラグの粗粒率（F.M.値）との関係
を示すグラフである。FIG. 2 is a graph showing the relationship between the cooling water temperature during hard granulated slag production and the coarse particle ratio (FM value) of the hard granulated slag in the out-of-furnace method.
【図３】水／スラグ比と水砕スラグの単位容積質量との
関係を示すグラフである。FIG. 3 is a graph showing a relationship between a water / slag ratio and a unit volume mass of granulated slag.
【図４】水砕槽水温と水砕スラグの単位容積質量との関
係を示すグラフである。FIG. 4 is a graph showing the relationship between the water temperature of the granulated tank and the unit volume mass of the granulated slag.
【図５】炉前方式における、冷却水温度と水砕スラグの
粗粒率（F.M.値）との関係を示すグラフである。FIG. 5 is a graph showing a relationship between a cooling water temperature and a coarse particle ratio (FM value) of granulated slag in a pre-furnace method.
【図６】炉前方式の水砕スラグ製造設備の概要を示す側
面図である。FIG. 6 is a side view showing an outline of a granulated slag manufacturing facility of a furnace front type.
【図７】炉外方式の水砕スラグ製造設備の概要を示す側
面図である。FIG. 7 is a side view showing an outline of a granulated slag production facility of an out-of-furnace type.
１ 高炉 ２ 出銑口 ３ 出銑樋 ４ スラグ樋 ５ 冷却水（：吹製水）噴射ノズル ６ 吹製函 ７ 冷却水（：吹製水） ８ 水砕槽 ９ 煙突 10 温水槽 11 回転水切り装置 11a 円筒状のフィルタ 12 ディストリビュータ 13a,13b ベルトコンベア 14 熱電対 15 冷水槽 16 冷却塔 17 秤量装置 18ａ，18b 製品ホッパ 19 切り換え用ダンパ 20，30 送液ポンプ 21 流量調節弁 22 冷却水（：吹製水）の流量計 23 制御装置 31a 送液配管 31b 送液バイパス配管 32a,32b 切り換え弁 50 スラグ鍋 51 溶融高炉スラグ 52 タンディッシュ 53 コールドランナー 54 冷却水（：吹製水） 55 水噴射ノズル 56 製品スラグ ｆ1 溶融高炉スラグの流れ方向 ｆ2 冷却水（：吹製水）の流れ方向 ｆ3 水砕スラグの移送方向 ｆ4 補給水の流れ方向DESCRIPTION OF SYMBOLS 1 Blast furnace 2 Tap hole 3 Tap hole 4 Slag gutter 5 Cooling water (: blowing water) injection nozzle 6 blowing box 7 cooling water (: blowing water) 8 Granulation tank 9 Chimney 10 Hot water tank 11 Rotary draining device 11a Cylindrical filter 12 Distributor 13a, 13b Belt conveyor 14 Thermocouple 15 Chilled water tank 16 Cooling tower 17 Weighing device 18a, 18b Product hopper 19 Switching damper 20, 30, Liquid feed pump 21 Flow control valve 22 Cooling water Water) Flow meter 23 Controller 31a Liquid feed pipe 31b Liquid feed bypass pipe 32a, 32b Switching valve 50 Slag pot 51 Melting blast furnace slag 52 Tundish 53 Cold runner 54 Cooling water (blown water) 55 Water injection nozzle 56 Product slag f 1 molten blast furnace slag in the flow direction f 2 cooling water: the flow direction of the transport direction f 4 makeup water flow direction f 3 granulated slag (吹製water)
Claims (4)
スラグを製造する際に、冷却水温度：60〜80℃で吹製す
ることを特徴とする粗粒硬質水砕スラグの製造方法。1. A method for producing a coarse-grained hard granulated slag, wherein the molten blast furnace slag is quenched with water to produce hard granulated slag at a cooling water temperature of 60 to 80 ° C. .
スラグを製造する際に、冷却水温度が60〜80℃の範囲内
となるように水温調節して吹製することを特徴とする粗
粒硬質水砕スラグの製造方法。2. A method for rapidly cooling a molten blast furnace slag with water to produce hard granulated slag, wherein the temperature of the cooling water is adjusted to be in a range of 60 to 80 ° C. and blown. Method for producing coarse-grained hard granulated slag.
が炉前方式の水砕スラグの製造方法であって、冷却水流
量(t−冷却水／hr) ／溶融高炉スラグ流量(t−スラグ／
hr) ≧30、かつ水砕槽内水温≦95℃の条件下で吹製する
ことを特徴とする請求項１または２記載の粗粒硬質水砕
スラグの製造方法。3. The method for producing coarse-grained hard granulated slag according to the present invention is a method for producing granulated slag in a pre-furnace system, wherein a flow rate of cooling water (t-cooling water / hr) / a flow rate of molten blast furnace slag (t- Slag /
The method of claim 1 or 2, wherein the slag is blown under a condition of ≧ 30 and a water temperature in the granulation tank ≦ 95 ° C.
定し、水砕スラグ製造量から溶融高炉スラグ流量を求
め、冷却水流量(t−冷却水／hr) ／溶融高炉スラグ流量
(t−スラグ／hr) ≧30の条件下で吹製することを特徴と
する請求項３記載の粗粒硬質水砕スラグの製造方法。4. The flow rate of the cooling water and the production amount of the granulated slag are measured, and the flow rate of the molten blast furnace slag is obtained from the production amount of the granulated slag, and the cooling water flow rate (t-cooling water / hr) / the molten blast furnace slag flow rate
4. The method for producing coarse-grained hard granulated slag according to claim 3, wherein the slag is blown under the condition of (t-slag / hr) .gtoreq.30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3939498A JPH11236255A (en) | 1998-02-20 | 1998-02-20 | Production of coarse-grained hard watergranulated blast furnace slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3939498A JPH11236255A (en) | 1998-02-20 | 1998-02-20 | Production of coarse-grained hard watergranulated blast furnace slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11236255A true JPH11236255A (en) | 1999-08-31 |
Family
ID=12551793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3939498A Pending JPH11236255A (en) | 1998-02-20 | 1998-02-20 | Production of coarse-grained hard watergranulated blast furnace slag |
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| Country | Link |
|---|---|
| JP (1) | JPH11236255A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001062683A1 (en) * | 2000-02-25 | 2001-08-30 | Kawasaki Steel Corporation | Blast furnace granulated slag, fine aggregate prepared therefrom and method for producing them |
| US6624250B2 (en) * | 1999-08-25 | 2003-09-23 | Cyro Industries | Electrostatic-dissipative multipolymer compositions |
| JP2012239959A (en) * | 2011-05-17 | 2012-12-10 | Jfe Steel Corp | Method for treating wastewater containing reductive sulfur component |
| JP2014172808A (en) * | 2013-03-12 | 2014-09-22 | Sumitomo Metal Mining Co Ltd | Method for controlling wet density of water granulated slag |
| JP2015231923A (en) * | 2014-06-09 | 2015-12-24 | 日鉄住金環境株式会社 | Manufacturing method of granulated blast furnace slag and granulated blast furnace slag obtained by the same |
-
1998
- 1998-02-20 JP JP3939498A patent/JPH11236255A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6624250B2 (en) * | 1999-08-25 | 2003-09-23 | Cyro Industries | Electrostatic-dissipative multipolymer compositions |
| WO2001062683A1 (en) * | 2000-02-25 | 2001-08-30 | Kawasaki Steel Corporation | Blast furnace granulated slag, fine aggregate prepared therefrom and method for producing them |
| JP2012239959A (en) * | 2011-05-17 | 2012-12-10 | Jfe Steel Corp | Method for treating wastewater containing reductive sulfur component |
| JP2014172808A (en) * | 2013-03-12 | 2014-09-22 | Sumitomo Metal Mining Co Ltd | Method for controlling wet density of water granulated slag |
| JP2015231923A (en) * | 2014-06-09 | 2015-12-24 | 日鉄住金環境株式会社 | Manufacturing method of granulated blast furnace slag and granulated blast furnace slag obtained by the same |
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