JPS5811375B2 - Cement raw material manufacturing method - Google Patents

Description

【発明の詳細な説明】 本発明は冶金炉滓特に高炉滓を出発原料とするセメント
原料の製造方法に係る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a cement raw material using metallurgical furnace slag, particularly blast furnace slag, as a starting material.

一般に高炉滓を溶融状態において、水および水蒸気等を
用いて吹きとばし水中に投入して水滓としたものを乾燥
粉化してセメント原料とすることは周知の技術である。Generally, it is a well-known technique to blow away blast furnace slag in a molten state using water, steam, etc. and throw it into water to form water slag, which is then dried and powdered to be used as a raw material for cement.

ところでこのように水滓とすることは、処理設備が高面
になることに増して、処理水の浄化に舊しい設備投資を
必要とすることおよび製品水滓は含氷率が高く乾燥に多
くのエネルギーを必要とし、さらにこの乾燥工程での大
気汚染の問題などの点で難点がある。By the way, using water slag in this way not only requires expensive treatment equipment, but also requires a large investment in equipment to purify the treated water, and the product water slag has a high ice content and requires a lot of drying. It requires a lot of energy, and there are also drawbacks such as the problem of air pollution during this drying process.

そこで本発明者等は水を必要とせず、乾式によって高炉
滓をセメント原料化する技術開発を行なった結果、本発
明の方法を開発したものでその要旨は、ＳｉＯ２３１〜
４２％、ＣａＯ３６〜４５％、Ａｌ２Ｏ３９〜１７％、
ＭｇＯ３〜１３％を主成分とする溶融高炉滓を常温の空
気およびもしくは不活性気体で吹きとばし非晶質部７０
％以上、比重２．７〜３．０、圧砕粉化率１．０以下、
粒径０．１５〜１０ｍｍの滑らかな曲表面を有する球状
硬質人工砂としたのち、該人工砂を９０μ以下に微粉砕
することを特徴とするセメント原料製造方法にある。Therefore, the inventors of the present invention developed a technology to convert blast furnace slag into cement raw material using a dry process without the need for water, and as a result, they developed the method of the present invention.
42%, CaO36-45%, Al2O39-17%,
Molten blast furnace slag containing 3 to 13% MgO as a main component is blown away with room temperature air and/or inert gas to form an amorphous part 70.
% or more, specific gravity 2.7 to 3.0, crushing pulverization rate 1.0 or less,
A method for producing a raw material for cement, which is characterized in that after preparing spherical hard artificial sand having a particle size of 0.15 to 10 mm and a smooth curved surface, the artificial sand is pulverized to a size of 90 microns or less.

而して本発明についてさらに詳しく説明する。The present invention will now be explained in more detail.

従来、粒滓もしくは水滓の製造手段としては第１図ある
いは第２図、第３図に示すような処理装置によって行な
われることが一般的であった。Conventionally, granule slag or water slag has generally been produced using a processing apparatus as shown in FIG. 1, FIG. 2, or FIG. 3.

即ち第１図は溶融した状態の高温滓１（以下溶融した状
態の滓を高温滓と言い細化され凝固もしくは半凝固した
状態の滓を粒滓という）を回転ドラム２の遠心力で空中
に飛翔させることにより冷却しながら小球形を造形した
後、集積場３に落下せしめるものであるが、該装置で効
果的に粒滓を製造するには高温環１が空中を飛翔する間
にその温度を凝固点以下に低下させねばならない。That is, in FIG. 1, high-temperature slag 1 in a molten state (hereinafter, molten slag is referred to as high-temperature slag, and slag in a finely solidified or semi-solidified state is referred to as granulated slag) is blown into the air by the centrifugal force of a rotating drum 2. After forming small spheres while cooling them by flying them, they are dropped into a collection site 3. In order to effectively produce granule slag with this device, the temperature of the high-temperature ring 1 must be lowered while it is flying through the air. must be lowered below the freezing point.

このためには回転ドラム２の径を大きくするか回転数を
高くせねばならないことから粒滓の飛散範囲が広くなり
、当然広大な広さの集積場３を必要としその回収効率は
すこぶる悪いものであった。For this purpose, the diameter of the rotating drum 2 must be increased or the number of revolutions must be increased, which widens the scattering range of the slag, which naturally requires a vast collection area 3, and the collection efficiency is extremely poor. Met.

また回転ドラム２の遠心力を大きくするには実用的見地
から自ずと限界があるため、高温環１が空中飛翔の間に
完全に凝固せず集積場３に落下後再融着する状態も多く
発生し、効果的な粒滓の製造には問題が多かった。Furthermore, since there is a limit to increasing the centrifugal force of the rotating drum 2 from a practical standpoint, there are many cases where the high-temperature ring 1 does not completely solidify during flight and re-fuses after falling to the collection site 3. However, there were many problems in producing effective granule slag.

次に第２図の実施例は樋４より落下する高温環１にノズ
ル５を介して圧縮空気、不活性ガスあるいは水蒸気、高
圧水等を吹付けることによって細化すると共に空中に飛
翔させた後冷却槽６に落下させて凝固させ、然る後コン
ベア７で前記粒滓を回収するものである。Next, in the embodiment shown in FIG. 2, compressed air, inert gas, steam, high-pressure water, etc. are sprayed onto the high-temperature ring 1 falling from the gutter 4 through the nozzle 5 to make it thin and fly it into the air. The particles are dropped into a cooling tank 6 to be solidified, and then a conveyor 7 collects the slag.

第３図の実施例は樋４より落下する高温環１にノズル５
を介して高圧水を吹きつげて細化すると同時に急冷させ
、そのまま流下樋１９を流れて攪拌槽２０へ入る。In the embodiment shown in FIG. 3, a nozzle 5 is attached to the high temperature ring 1 falling from the gutter
High-pressure water is blown through the pipe to atomize the material and at the same time rapidly cool it, and it flows directly through the downflow gutter 19 and enters the stirring tank 20.

攪拌槽２０で均一に攪拌冷却された水滓は、スラリーポ
ンプ２１で脱水槽２２に送られ水２３と分離されたのち
回収される。The water slag that has been uniformly stirred and cooled in the stirring tank 20 is sent to a dehydration tank 22 by a slurry pump 21, separated from water 23, and then recovered.

該装置においても、前記実施例と同様に広大な設置面積
を必要とすると共に粒滓回収のための設備が大掛かりと
なり、さらに粒化された高温環１は急激に冷却されるた
め粒滓はガラス化率が高く、セメント原料としては好ま
しいものの、処理水の浄化と製品の乾燥が前述のように
難儀なものであった。This device also requires a vast installation area as in the above-mentioned embodiment, and the equipment for collecting the slag is large-scale.Furthermore, since the granulated high-temperature ring 1 is rapidly cooled, the slag becomes a glass slag. Although it has a high conversion rate and is desirable as a raw material for cement, it is difficult to purify the treated water and dry the product as described above.

そこで本発明者等は簡易で、しかし遠視問題、エネルギ
ー問題等において難点がすくない製造方法の開発を行な
った。Therefore, the inventors of the present invention have developed a manufacturing method that is simple but has fewer difficulties such as hyperopia and energy problems.

以下その具体的な構成について個々に詳細に説明する。The specific configurations will be explained in detail below.

第４図は本発明にかかる人工砂即ち粒滓の製造装置の一
実施例を示す構成断面図である。FIG. 4 is a sectional view showing an embodiment of an apparatus for producing artificial sand, that is, granule slag, according to the present invention.

図において鍋８に貯留された高温環１は鍋８の出口樋８
ａより流下する際ブロワ−９および吹付ノズル１０から
なる細化装置１１によって細化される。In the figure, the high temperature ring 1 stored in the pot 8 is connected to the outlet gutter 8 of the pot 8.
When flowing down from a, it is attenuated by an attenuation device 11 consisting of a blower 9 and a spray nozzle 10.

即ち出口樋８ａより流下する高温環１は吹付ノズル１０
からの常温の吹付元気によって吹飛ばされて細化され、
風洞１２内に飛翔する。That is, the high temperature ring 1 flowing down from the outlet gutter 8a is the spray nozzle 10.
It is blown away and finely divided by the normal temperature spray from
Fly into the wind tunnel 12.

風洞１２内に飛翔した高温環１は誘引ブロワ−１３の吸
引力によって風洞におよび導出管１４内を矢印ａ方向に
吸引搬送され、かつ該吸引搬送される間に凝固点以下ま
で冷却されて導出管１４の後端部に設置された分離槽１
５で前記空気と分離され粒滓は分離槽１５の取出口１５
ａより回収され、また、空気は吸引管１６を介して誘引
プロソー１３より大気中へ排出される。The high-temperature ring 1 that has flown into the wind tunnel 12 is suctioned and conveyed to the wind tunnel and inside the outlet pipe 14 in the direction of arrow a by the suction force of the induction blower 13, and while being suctioned and conveyed, it is cooled to below the freezing point and is transferred to the outlet pipe. Separation tank 1 installed at the rear end of 14
The grain slag separated from the air at step 5 is sent to the outlet 15 of the separation tank 15.
The air is collected from the suction pipe 16 and discharged from the induction prosaw 13 into the atmosphere.

風洞１２および導出管１４は細化装置１１に連設され、
細化された高温環１を効率よく飛翔させながら搬送する
もので本発明で称する筒状体とは該風洞１２、導出管１
４等を含めて言うものであり、又細化高温環１を該筒状
体を介して分離槽１５まで吸引搬送する吸引装置とは吸
引管１６および誘引ブロワ−１３を含めて言うものであ
る。The wind tunnel 12 and the outlet pipe 14 are connected to the attenuation device 11,
The cylindrical body referred to in the present invention, which conveys the thinned high-temperature ring 1 while flying it efficiently, is the wind tunnel 12 and the outlet pipe 1.
4, etc., and the suction device for sucking and transporting the thin high-temperature ring 1 through the cylindrical body to the separation tank 15 includes the suction pipe 16 and the induction blower 13. .

以上の如く本発明はその製造手段の１つが細化され、筒
状体に飛翔した高温環１を吸引搬送する手段とすること
を特徴の１つとするものであり、細化装置１１としては
本実施例の空気吹付手段に限ることなく、たとえば不活
性ガス等を吹付けることでも差支えない。As described above, one of the features of the present invention is that one of its manufacturing means is a means for sucking and conveying the high-temperature ring 1 that has been thinned and flung into a cylindrical body. The air blowing means is not limited to the air blowing means of the embodiment, and for example, inert gas or the like may be sprayed.

さて該細化装置１１と筒状体の設置位置の関係は細化装
置１１で飛翔される高温環１が筒状体、即ち風洞１２内
に効率的に飛翔されるように細化装置１１０種類、特性
に応じて適宜決定する必要がある。Now, the relationship between the installation positions of the attenuation device 11 and the cylindrical body is such that the high temperature ring 1 that is flown by the attenuation device 11 is efficiently blown into the cylindrical body, that is, the wind tunnel 12. , it is necessary to decide appropriately according to the characteristics.

さて風洞１２内に飛翔された高温環１は風洞１２の開放
部より吸引される空気および吹付空気あるいは不活性ガ
ス、水蒸気等を搬送気体として風洞１２から導出管１４
に集合されつつ搬送されるが、本実施例では前記風洞１
２内に飛翔した高温環１を効率的に集合させるために風
洞１２の端部にアーチ形の衝突板１７を設け、該衝突板
１７に飛翔した高温環１を衝突させて落下させると共に
搬送気体の流動抵抗をより少なくして流速の速い導出管
１４に吸引させた。Now, the high-temperature ring 1 that has flown into the wind tunnel 12 is taken out from the wind tunnel 12 through a lead-out pipe 14 using air sucked from the open part of the wind tunnel 12, blown air, inert gas, water vapor, etc. as a carrier gas.
However, in this embodiment, the wind tunnel 1
In order to efficiently gather the high-temperature rings 1 that have flown into the wind tunnel 12, an arch-shaped collision plate 17 is provided at the end of the wind tunnel 12. The flow resistance of the liquid was reduced and the liquid was sucked into the outlet pipe 14 with a high flow rate.

而して高温環１を吸引搬送させることにより前述の如く
風洞５内に広く飛翔された高温環１も口径を比較的小さ
くした導出管１４に容易に集合できるため、一定の位置
、即ち本実施例の分離槽１５で効率的に回収でき、設備
全体を非常にコンパクトにできる。By suctioning and transporting the high temperature ring 1, the high temperature ring 1 that has been widely blown into the wind tunnel 5 as described above can also be easily collected in the outlet pipe 14 whose diameter is relatively small, so that it can be placed at a certain position, that is, in this embodiment. It can be efficiently recovered using the separation tank 15 of the example, and the entire equipment can be made very compact.

また細化装置１１の遠心力あるいは飛翔力が小さい場合
でも、高温環１の空中飛行距離は誘引ブロワ−１３の吸
引力によって比較的長くでき、該空中飛行の間に元号な
冷却が行えるため粒化された高温環１の再融着の問題が
大巾に改善された。Furthermore, even if the centrifugal force or flight force of the attenuation device 11 is small, the flight distance of the high-temperature ring 1 can be relatively long due to the suction force of the attraction blower 13, and proper cooling can be achieved during the flight. The problem of refusion of the granulated high-temperature ring 1 has been greatly improved.

尚風洞１２の壁面および衝突板１７における高温滓１の
付着を防止するために風洞１２の壁面および衝突板１７
を水冷構造とすることや研摩加工あるいはメッキ仕上を
行うことや、さらに壁面に沿って圧縮空気を流通せしめ
る等の手段を構することが効果的である。In addition, in order to prevent the adhesion of high-temperature slag 1 on the wall surface of the wind tunnel 12 and the collision plate 17,
It is effective to have a water-cooled structure, to perform a polishing or plating finish, and to provide means such as circulating compressed air along the wall surface.

以上の如く風洞１２および導出管１４は筒状体の主要な
構成部材であり、前述の効果を有するものであるが筒状
体としては図示はしないけれども全体を同一形状、たと
えば風洞１２のみを筒状体とし、風洞１２の後端部に前
記風洞１２より断面形状を大きくした分離槽１５を設置
し、搬送気体の流速を高温滓１を搬送し得る限界搬送流
速以下に落すことによって粒滓の回収を行う構造とする
ことでも差支えない。As mentioned above, the wind tunnel 12 and the outlet pipe 14 are the main constituent members of the cylindrical body, and have the above-mentioned effects, but although they are not shown as cylindrical bodies, they have the same shape as a whole, for example, only the wind tunnel 12 is made into a cylindrical body. A separation tank 15 with a larger cross-sectional shape than the wind tunnel 12 is installed at the rear end of the wind tunnel 12, and the flow rate of the carrier gas is lowered to a limit conveying flow velocity that can convey the high-temperature slag 1. It is also possible to have a structure that allows collection.

さらに風洞１２の大きさおよび長さを細化装置１１の特
性に応じて適切に設定することにより高温滓１は風洞１
２内の飛翔中にその表面温度が確実に凝固温度以下まで
低下するため後述する実験例でも判明するように物理的
性質の非常に秀れた粒滓が得られ、またこの場合高温滓
１が風洞１２を通過した後の導出管１４あるいは風洞１
２の後端部の適宜な場所で散水等の強制冷却を行っても
その性質に変化はなく該散水手段の採用は粒滓の完全冷
却が行え、大容量処理にも適している。Furthermore, by appropriately setting the size and length of the wind tunnel 12 according to the characteristics of the thinning device 11, the high temperature slag 1 can be
As the surface temperature of the grain slag reliably decreases to below the solidification temperature during the flight of the grain slag 2, a grain slag with excellent physical properties is obtained, as will be seen in the experimental examples described later. Outlet pipe 14 or wind tunnel 1 after passing through wind tunnel 12
Even if forced cooling such as water sprinkling is performed at an appropriate location on the rear end of the grain slag, there is no change in its properties, and the use of this water sprinkling means allows for complete cooling of the grain slag and is suitable for large-capacity processing.

ただし、前記散水は、得られる粒滓が直ちに乾固する程
度にとどめることが好ましい。However, it is preferable that the water sprinkling is limited to such an extent that the obtained granule slag immediately dries up.

次に第５図は高温滓１との接触でＳＯｘ等のガスを含ん
だ搬送気体を分離槽１５と吸引管１６を介して誘引ブロ
ワ−１３との間に設置された脱硫装置１８で完全に無害
化処理した後、大気中に放散するようにしたものである
。Next, in FIG. 5, the carrier gas containing gases such as SOx is completely removed by the desulfurization device 18 installed between the induction blower 13 via the separation tank 15 and the suction pipe 16. After being rendered harmless, it is released into the atmosphere.

次に第１表は前記第４図の実施例における諸元を示す。Next, Table 1 shows the specifications of the embodiment shown in FIG. 4.

本実験例で得られた粒滓は添付の参考写真に示すように
緻密な組織で表面形状のなめらかな球形あるいは球形に
近い形状となり、前記実施例における粒度分布の一例は
第２表に示す通りであった。As shown in the attached reference photo, the grain slag obtained in this experimental example has a dense structure and a smooth spherical or nearly spherical shape, and an example of the particle size distribution in the above example is as shown in Table 2. Met.

次に本発明にがかる粒滓と比較材との物性について説明
する。Next, the physical properties of the grain slag according to the present invention and a comparative material will be explained.

第３表は本実験で得られた人工砂即ち粒滓と天然砂、水
滓等の物理的性質との対比、並びに標準値、あるいは基
準値との対比表である。Table 3 is a comparison table of the physical properties of artificial sand, that is, granule slag obtained in this experiment, natural sand, water slag, etc., and a comparison table with standard values or reference values.

而して、本発明の粒滓め製造手段の要点につきさらに詳
細に説明する。The main points of the grain slag production means of the present invention will now be explained in more detail.

第６図は吹付ノズル１０′の異なった一実施例の詳細と
取付状態を示す側面図であり、流下する高温環１に対し
て、吹付空気の吹出口１０′ａの位置を段々にずらした
多段式吹付ノズル１０′を示すものである。FIG. 6 is a side view showing the details and installation state of a different embodiment of the blowing nozzle 10', in which the position of the blowing air outlet 10'a is gradually shifted with respect to the flowing high-temperature ring 1. A multi-stage spray nozzle 10' is shown.

該多段式吹付ノズル１０′の吹出口１０′ａの横巾ば高
温環１の流下中より若干広い程度で該多段式吹付ノズル
１０′の中心線を水平線に対して１０〜４５°の範囲の
傾斜角θで上向きに装着すれば飛行距離も長くなり、拡
散効果も非常に優れ、本発明者等の経験では前記条件を
満足するためには吹出口１０′ａが単数の場合より本実
施例の１０ａ′、１０ａ″、１０ａ′″の如く複数個の
方が効果的であることが確認された。The width of the outlet 10'a of the multi-stage spray nozzle 10' is slightly wider than the flow of the high-temperature ring 1, and the center line of the multi-stage spray nozzle 10' is set at an angle of 10 to 45 degrees with respect to the horizontal line. If the air outlet 10'a is mounted upward at an angle of inclination θ, the flight distance will be longer and the diffusion effect will be very good.According to the experience of the present inventors, in order to satisfy the above conditions, the air outlet 10'a of this embodiment is better than the case where there is a single outlet 10'a. It has been confirmed that it is more effective to use a plurality of them, such as 10a', 10a'', and 10a''.

第６図において複数の点１００で示すものは、小粒に分
散し、表面張力によって球状化し空気中を飛しようする
凝固前の粒滓である。What is indicated by a plurality of points 100 in FIG. 6 is particle slag before solidification that is dispersed into small particles, becomes spheroidized by surface tension, and is about to fly in the air.

この空気中における飛しよう距離が長く滞空時間が光分
にとれれば、前述の風洞１２や導出管１４を用いなくと
も良い。If the flying distance in the air is long and the time spent in the air is equal to the amount of light, the aforementioned wind tunnel 12 and lead-out pipe 14 may not be used.

さて、吹付ノズル１０′で効果的に人工砂をつくる要点
の１つは高温環１を出口樋８ａから流下せしめる際に、
該高温環１を層流とし、流下せしめることにある。Now, one of the key points to effectively create artificial sand with the spray nozzle 10' is that when the high temperature ring 1 is allowed to flow down from the outlet gutter 8a,
The purpose is to make the high-temperature ring 1 a laminar flow and make it flow downward.

即ち第７図に示すように出口樋８ａから流下する高温環
１の厚みｔはたとえば５〜３５ｍｍ程度とする。That is, as shown in FIG. 7, the thickness t of the high temperature ring 1 flowing down from the outlet gutter 8a is, for example, about 5 to 35 mm.

このようにすると高温環１は細粒に分割され、各々の細
粒は表面張力によって球状化して吹付ノズル１０′から
の吹付空気流に乗って空気中を飛しようする間に表面が
凝固する。In this way, the high-temperature ring 1 is divided into fine particles, and each fine particle becomes spherical due to surface tension, and its surface solidifies while flying through the air on the air flow from the spray nozzle 10'.

而して落下するまで適宜の時間を持たせれば落下しても
形状が崩れる心配はすくない。Therefore, if you allow an appropriate amount of time for it to fall, there is little worry that the shape will collapse even if it falls.

本発明の特徴の１つは、このように空気中を飛しようす
る間に表面張力による球状化とその後、飛しよう中もし
くは落下によって他物に接触した際に大きな形状変化を
起させない程度に凝固を進行せしめる点にある。One of the features of the present invention is that it becomes spherical due to surface tension while flying through the air, and then solidifies to the extent that it does not change shape significantly when it comes into contact with another object while flying or falling. The goal is to advance the process.

さて、前に述べたように高温環１に水蒸気や水蒸気と空
気を混合した気体を吹きつける手段は周知であり、本発
明者等は空気を吹きつけて実験した結果、吹付けの風速
によって粒滓の製造に最適範囲のあることを見出した。Now, as mentioned earlier, the means of blowing water vapor or a gas mixture of water vapor and air onto the high-temperature ring 1 is well known, and the inventors of the present invention have conducted experiments by blowing air, and have found that depending on the wind speed of the blowing, particles It was found that there is an optimal range for slag production.

即ち第８図は横軸に吹付ノズル１０′からの吹付空気の
風速（ｍ／ｓ）をとり、縦軸に鉱滓線発生率（％）（重
量比率）をとったものであるが、風速が２００ｍ／ｓを
こえると急激に鉱滓綿となる率が高くなり粒滓の生産に
非常な障害をひきおこす、と言うのは鉱滓綿は比重が軽
いため、比率としては僅かであっても容積的に多量なも
のとなり、その処理に多大の労力を必要とするのみなら
ず、粒滓との分離や該鉱滓綿の処理設備も高額なものと
なるためであり、また得られる人工砂も極細砂分が多く
なって、目的に反する。In other words, in Figure 8, the horizontal axis shows the wind speed (m/s) of the air blown from the blow nozzle 10', and the vertical axis shows the slag line generation rate (%) (weight ratio). When the speed exceeds 200 m/s, the rate of turning into slag increases rapidly, causing a serious problem in the production of slag.This is because slag has a light specific gravity, so even if the ratio is small, it will increase in volume. This is because not only does it require a lot of labor to process it, but also the equipment for separating it from the slag and processing the slag is expensive, and the artificial sand obtained also has a high content of ultra-fine sand. becomes too many, which defeats the purpose.

また風速が５０ｍ／ｓ以下になると高温環１が細粒に分
離する効率が著しく低下し、粒滓とならず、塊状物とな
って本発明の目的に反するものとなる。Furthermore, when the wind speed is less than 50 m/s, the efficiency with which the high-temperature ring 1 is separated into fine particles decreases significantly, and the particles do not become slag but become lumps, which is contrary to the purpose of the present invention.

また前述の流下する高温環の厚みｔを５〜３５朋に限定
する理由は、前述の実験において、厚みｔを５ｍｍ以下
にすることは出口樋８ａでの凝固が著しく流下が困難に
なることと、鉱滓綿の発生が多くなることが、その限定
理由であり、また３５ｍｍ以上にすると風速を変化させ
ても細化が不光分となり一定風量当りの処理滓量に限界
があることから、塊状物が多くなるか朔が充分性なわれ
なくなり、本発明の目的とするセメント原料としての粒
度が揃っておりしかも強度のすぐれた低価格の粒滓の供
給が害されるからである。Furthermore, the reason for limiting the thickness t of the high-temperature ring flowing down to 5 to 35 mm is that in the experiment described above, if the thickness t is 5 mm or less, the solidification in the outlet gutter 8a will be significant, making it difficult to flow down. The reason for this limitation is that more slag is generated, and if the wind speed is set to 35 mm or more, even if the wind speed is changed, the fineness becomes opaque and there is a limit to the amount of slag that can be processed per constant air flow. This is because the amount of slag increases or the slag becomes insufficient, which impairs the supply of low-cost slag with uniform particle size and excellent strength, which is the object of the present invention as a raw material for cement.

さらに前記高温環１の温度は熱電対による直接阿測定で
１３００〜１４５０℃の温度範囲にあることが良いこと
が確しかめられた。Furthermore, it was confirmed that the temperature of the high-temperature ring 1 should preferably be in the temperature range of 1300 to 1450 DEG C. by direct temperature measurement using a thermocouple.

即ち１３００℃以下では細化が困難になり１４５０℃以
上では鉱滓綿の発生率が高くなって目的を害する。That is, at temperatures below 1,300°C, it becomes difficult to finely refine the material, and at temperatures above 1,450°C, the generation rate of slag increases, which impairs the purpose.

次に吹付ノズルによって細化し、空気中を飛しようする
球状の粒滓の滞空時間であるが、本発明者等の測定によ
ればほぼ２−７秒でよく、前記吹付ノズルのみによる飛
しようの場合の飛しよう距離で言えば水平距離において
１５ｍ以上であれば元号であるが、落下時における球状
粒滓の温度が比較的高い場合は、粒滓相互の再溶着を防
ぐため、落下地点において前述の通り撒水するとかある
いは広範囲に散乱させ粒滓相互があまり接触しないなど
の工夫が効果的である。Next, the flight time of the spherical slag that is made fine by the spray nozzle and is about to fly in the air is approximately 2-7 seconds, according to measurements by the present inventors. In terms of flight distance, if the horizontal distance is 15m or more, it is an era name, but if the temperature of the spherical slag is relatively high when it falls, in order to prevent the slag from re-welding to each other, it is As mentioned above, it is effective to spray water or scatter it over a wide area so that the slag does not come into contact with each other much.

さて通常高炉滓は次の第４表に示すような組成を有し、
固化後破砕することによって砂のような粒状体となりや
すい性質を有することは周知の通りである。Now, blast furnace slag usually has a composition as shown in Table 4 below,
It is well known that it tends to become sand-like granules when crushed after solidification.

而して本発明の目的の１つは、多量に発生する高炉滓か
ら有用なセメント原料をうろことにあり、他の目的は水
処理や乾燥が困難な水滓法でなく、水をほとんど必要と
しない乾式方法によってセメント原料をうろことにあり
さらに異なった他の目的は、セメント原料中間体として
運搬、貯蔵などが容易な粒滓を製造可能とする点にある
。One of the purposes of the present invention is to extract useful cement raw materials from blast furnace slag, which is generated in large quantities, and another purpose is to extract useful cement raw materials from blast furnace slag, which is generated in large quantities. Another objective of the method of extracting cement raw materials by a dry method that does not involve drying is to produce slag that can be easily transported and stored as a cement raw material intermediate.

本発明における成分は通常の高炉滓が有するもので、本
発明は特に成分について改質の必要性がなく、本発明者
等の実験では、前記成分の限定範囲において性状品質に
ついて確実な再現性が認められた。The components used in the present invention are those found in ordinary blast furnace slag, and there is no need for modification of the components in particular in the present invention.In experiments conducted by the present inventors, reliable reproducibility of properties and quality was achieved within a limited range of the above-mentioned components. Admitted.

本発明における粒滓の詳細成分を次の第５表に示す。The detailed components of the granule slag in the present invention are shown in Table 5 below.

ＭｎＯやＴｉＯ２、Ｓ、ＦｅＯなどの成分は比較的含有
量がすくなく、これらの変動が人工砂の物性に及ぼす影
響はすくない。The content of components such as MnO, TiO2, S, and FeO is relatively small, and variations in these components have little effect on the physical properties of the artificial sand.

しかしながらＦｅ分が多くなると物性には変化が出てく
るものと推定される。However, it is presumed that as the Fe content increases, the physical properties change.

而して、本発明にがかる粒滓の特徴の１つは製造ままの
粒径が１０ｍｍ以下で、球状もしくはそれに近い形状を
なしていることであり、さらに第６表の粒度分布の表に
示す通り０．６〜５ｍｍ径のものが大部分であって、微
粉にするに当りクラツシングな容易な点があげられる。One of the characteristics of the granule slag according to the present invention is that the particle size as produced is 10 mm or less and is spherical or nearly spherical. Most of the powder has a diameter of 0.6 to 5 mm, which makes it easy to crush when making it into a fine powder.

次に本発明にかかる人工砂（粒滓）の物性について説明
する。Next, the physical properties of the artificial sand (granule slag) according to the present invention will be explained.

第７表は圧砕粉化率（％）の比較例である。Table 7 is a comparative example of crushing and pulverization ratios (%).

而して前記圧砕粉化率とは、１５０φ、１５０ｈのモー
ルドにある粒度範囲の原試料を軽装し、荷重１ｔｏｎを
１５ｓｅｃ維持したのち、試料を取り出し、元の粒度範
囲より小さく粉砕されたものの重量割合を百分率で表わ
したものである。The above-mentioned crushing and pulverization rate is the weight of the original sample in the particle size range in a 150φ, 150h mold, after which a load of 1 ton was maintained for 15 seconds, the sample was taken out, and the material was crushed to a size smaller than the original particle size range. The ratio is expressed as a percentage.

第７表から明らかなように、本発明にかかる人工砂は天
然の月妙に勝る圧砕粉化率を有するもので、換言すると
、川砂以上に硬く、緻密な物性を有しかかる人工砂が工
業的規模で供給された実例はない。As is clear from Table 7, the artificial sand according to the present invention has a crushing rate superior to that of natural sand. There are no examples of it being supplied on a large scale.

さて、本発明にかかる人工砂の比重について、絶乾比重
で比較した例を第８表に示す。Now, Table 8 shows an example comparing the specific gravity of the artificial sand according to the present invention in terms of absolute dry specific gravity.

本発明にかかる人工砂は著しく比重が高く、これに匹敵
するのは、転炉滓（ＦｅＯの含有率が高い）を添加（こ
の例では４％添加）した高炉滓を自然放置し破砕して得
た細粒のみであるが、該細粒は第７表の圧砕粉化率の表
から明らかなように本発明にかかる人工砂に比較して砕
けやすい物性を有する。The artificial sand according to the present invention has a significantly high specific gravity, and it is comparable to that obtained by leaving blast furnace slag to which converter slag (high FeO content) has been added (4% in this example) and then crushing it. Although the obtained fine grains are the only ones, the fine grains have physical properties that are more easily friable than the artificial sand according to the present invention, as is clear from the table of crushing and pulverization ratio in Table 7.

次に単位体積重量（ｋｇ／ｍ３）比較を第９表に、吸水
量（％）の比較を第１０表に示す。Next, Table 9 shows a comparison of unit volume weight (kg/m3), and Table 10 shows a comparison of water absorption (%).

さて、本発明にかかる人工砂は参考図として添付した写
真に示すように球状でしかも平滑な表面を有することが
特徴の１つであるが、非晶質（ガラス化率）の度合が高
いことも特徴としている。Now, one of the characteristics of the artificial sand according to the present invention is that it has a spherical and smooth surface as shown in the photo attached as a reference image, but it also has a high degree of amorphousness (vitrification rate). It also features

次の第１１表にサイズ別のガラス化率の１例を示す。Table 11 below shows an example of the vitrification rate by size.

即ち、本発明にかかる人工砂は他の人工砂と比較して著
しくガラス化率の高いことが特徴であって、これ以上の
ガラス化率を示すものに周知の水滓がある。That is, the artificial sand according to the present invention is characterized by a significantly higher vitrification rate than other artificial sands, and the well-known water slag has a higher vitrification rate.

こゝでガラス化率は、人工砂８８〜６２μに粉砕したも
のを偏光顕微鏡で見てガラスと結晶を区別しガラスの割
合を百分率で示したものである。Here, the vitrification rate is determined by observing the artificial sand pulverized to 88 to 62 μm using a polarizing microscope to distinguish glass from crystal, and then expressing the proportion of glass as a percentage.

さて、前記人工砂はガラス化率が高いため周知のボール
ミル、ロッドミル、インパクトクラッシャー等の粉砕装
置によって容易に微粉砕することが可能である。Since the artificial sand has a high vitrification rate, it can be easily pulverized using a known pulverizing device such as a ball mill, a rod mill, or an impact crusher.

次に前記本発明にがかる粒滓を９０μ以下に微粉砕した
もの（以下単に風滓セメントと略称する。Next, the grain slag according to the present invention is finely pulverized to 90 μm or less (hereinafter simply referred to as wind slag cement).

）に対しポルトランドセメントを１．５倍量添加したも
のを用いてセメントの強さ試験を行った例を第１２表に
示す。Table 12 shows an example in which a cement strength test was conducted using 1.5 times the amount of Portland cement added to ().

尚セメントの強さ試験はＪＩＳＲ５２０１による。The cement strength test is based on JISR5201.

９０μ以下とする理由は９０μ以上ではセメントとして
の性能が著しく低下し、本発明の目的に反するからであ
る。The reason why the thickness is set to be 90μ or less is that if it is 90μ or more, the performance as a cement will be significantly reduced, which is contrary to the purpose of the present invention.

第１２表から明らかなように、本発明にかかる風滓セメ
ントはポルトランドセメントや高炉セメントの増量材と
して極めて有用であることが判る。As is clear from Table 12, the wind slag cement according to the present invention is extremely useful as an extender for Portland cement and blast furnace cement.

以上詳細に説明したように、本発明は安価な冶金炉滓特
に高炉滓から有用なセメント原料を製造する方法を提供
するものである。As described in detail above, the present invention provides a method for producing a useful cement raw material from inexpensive metallurgical furnace slag, particularly blast furnace slag.

【図面の簡単な説明】[Brief explanation of drawings]

第１図および第２図、第３図は従来、一般的に用いられ
ていた周知の粒滓および水滓の製造手段を示すもので第
１図は回転ドラム式、第２図は高圧気体あるいは高圧液
体吹付式の製造装置、第３図は水滓製造装置を示す断面
図である。 第４図〜第５図は本発明の実施例を示すもので第４図お
よび第５図はそれぞれ異なった実施例を示す粒滓製造装
置の構成断面図および部分図、第６図は、吹付ノズル詳
細説明図、第７図は高温滓流下要領概要説明図、第８図
は風速と鉱滓線発生率の対比グラフである。 １・・・・・・高温滓、２・・・・・・回転ドラム、３
・・・・・・集積抵４・・・・・・樋、５・・・・・ノ
ズル、６・・・・・・冷却槽、７・・・・・・コンベア
、８・・・・・・鍋、８ａ・・・・・・出口樋、９・・
・・・・ブロワ−１１０・・・・・・吹付ノズル、１１
・・・・・・細化装置、１２・・・・・・風洞、１２ａ
・・・・・・ホッパー、１３・・・・・・誘引ブロワ−
１１３ａ・・・・・・誘引ファン、１４・・・・・・導
出管、１５・・・・・・分離槽、１５ａ・・・・・・取
出口、１６・・・・・・吸引管、１７・・・・・・衝突
板、１８・・・・・・脱硫装置。Figures 1, 2, and 3 show well-known means of producing granule and water slag that have been commonly used in the past. Figure 1 is a rotating drum type, and Figure 2 is a high pressure gas or FIG. 3 is a cross-sectional view showing a high-pressure liquid spraying type manufacturing apparatus. 4 and 5 show embodiments of the present invention. FIGS. 4 and 5 are sectional views and partial views of a granule manufacturing apparatus showing different embodiments, and FIG. A detailed explanatory diagram of the nozzle, FIG. 7 is a schematic explanatory diagram of the flow of high-temperature slag, and FIG. 8 is a comparison graph of wind speed and slag line generation rate. 1... High temperature slag, 2... Rotating drum, 3
......Integrated resistor 4...Gutter, 5...Nozzle, 6...Cooling tank, 7...Conveyor, 8...・Pot, 8a...Exit gutter, 9...
...Blower 110...Blowing nozzle, 11
... Thinning device, 12 ... Wind tunnel, 12a
...Hopper, 13...Induction blower
113a...Induction fan, 14...Outlet pipe, 15...Separation tank, 15a...Output port, 16...Suction pipe, 17... Collision plate, 18... Desulfurization equipment.

Claims (1)

【特許請求の範囲】 １ ＳｉＯ２３１〜４２％、ＣａＯ３６〜４５％、Ａｌ
２Ｏ３９〜１７％、ＭｇＯ３〜１３％を主成分とする溶
融高炉滓を常温の空気およびもしくは不活性気体で吹き
とばし非晶質部７０％以上、比重２．７〜３．０、圧砕
粉化率１．０以下、粒径０．１５〜１０ｍｍの滑らかな
曲表面を有する球状硬質人工砂としたのち、該人工砂を
９０μ以下に微粉砕することを特徴とするセメント原料
製造方法。 ２５ｉｎ２３１〜４２％、ＣａＯ３６〜４５％、Ａｌ２
Ｏ３９〜１７％、ＭｇＯ３〜１３％を主成分とする１３
００〜１４５０℃の溶融高炉滓を、５〜３５ｍｍ厚の層
流となし、風速５０〜２００ｍ／ｓの常温の空気および
もしくは不活性気体で吹きとばし非晶質部７０％以上、
比重２．７〜３．０、圧砕粉化率１．０以下、粒径０．
１５〜１０ｍｍの清らかな曲表面を有する球状硬質人工
砂としたのち、該人工砂を９０μ以下に微粉砕すること
を特徴とする特許請求の範囲１項記載のセメント原料製
造方法。[Claims] 1 SiO231-42%, CaO36-45%, Al
Molten blast furnace slag containing 2O39-17% and MgO3-13% as main components is blown away with air at room temperature and/or inert gas to produce an amorphous portion of 70% or more, specific gravity 2.7-3.0, crushing rate. 1.0 mm or less and a particle size of 0.15 to 10 mm and a smooth curved surface, and then finely pulverizes the artificial sand to 90 μm or less. 25in231~42%, CaO36~45%, Al2
13 whose main components are O39~17% and MgO3~13%
Molten blast furnace slag at 00 to 1450°C is made into a laminar flow with a thickness of 5 to 35 mm, and is blown away with room temperature air and/or inert gas at a wind speed of 50 to 200 m/s to create an amorphous portion of 70% or more.
Specific gravity: 2.7 to 3.0, crushing rate: 1.0 or less, particle size: 0.
2. The method for producing a raw material for cement according to claim 1, wherein the artificial sand is made into spherical hard artificial sand having a clear curved surface of 15 to 10 mm, and then pulverized to 90 μm or less.