JP2016064940A - Manufacturing method of cement clinker - Google Patents

Manufacturing method of cement clinker Download PDF

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JP2016064940A
JP2016064940A JP2014193345A JP2014193345A JP2016064940A JP 2016064940 A JP2016064940 A JP 2016064940A JP 2014193345 A JP2014193345 A JP 2014193345A JP 2014193345 A JP2014193345 A JP 2014193345A JP 2016064940 A JP2016064940 A JP 2016064940A
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fine powder
blast furnace
furnace slag
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龍男 新見
Tatsuo Niimi
龍男 新見
中村 明則
Akinori Nakamura
明則 中村
弘義 加藤
Hiroyoshi Kato
弘義 加藤
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Tokuyama Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

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Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic composition having enhanced performance of cement containing blast furnace slag fine particle for overcoming a problem such as initial strength reduction or the like in using blast furnace slag fine particle as an admixture for cement.SOLUTION: By making an admixture with blast slag fine particle of 35 to 80 pts.mass and limestone fine particle of 20 to 65 pts.mass in a hydraulic composition containing portland cement clinker of 40 to 95 pts.mass, the admixture of 5 to 60 pts.mass, where total of the portland cement clinker and the admixture is 100 pts.mass, and gypsum of 1 to 4 pts.mass in terms of SOper whole composition, higher initial strength development is expressed than that in the case that blast slag fine particle is used singly for the admixture.SELECTED DRAWING: None

Description

本発明は、ポルトランドセメントクリンカー、高炉スラグ微粉末および石灰石微粉末、さらにセッコウを含む水硬性組成物に関する。詳しくは、混合材を含有する水硬性組成物の初期強度発現性を向上させる水硬性組成物に関する。   The present invention relates to a hydraulic composition containing Portland cement clinker, fine blast furnace slag powder and fine limestone powder, and gypsum. Specifically, the present invention relates to a hydraulic composition that improves the initial strength development of a hydraulic composition containing a mixed material.

近年の地球環境問題と関連して、廃棄物、副産物等の有効利用は重要な課題となっている。セメント産業、セメント製造設備の特徴を生かし、セメント製造時に原料や燃料として廃棄物を有効利用あるいは処理を行うことは、安全かつ大量処分が可能という観点から有効とされている。   In connection with recent global environmental problems, effective utilization of waste, by-products, etc. has become an important issue. Taking advantage of the characteristics of the cement industry and cement production facilities, it is considered effective from the viewpoint of safe and mass disposal to effectively use or treat waste as raw material or fuel during cement production.

大量生産・大量消費型産業であるセメント産業は、セメント製造時に原料や燃料として廃棄物を有効利用あるいは処理を行い、省資源・省エネルギーで効率よくセメントを製造することが重要とされている。   In the cement industry, which is a mass production and mass consumption type industry, it is important to efficiently use or treat waste as raw materials and fuels during cement production, and to efficiently produce cement with resource and energy savings.

一方、地球温暖化の観点からすると、セメント産業はCO排出量の多い産業に位置づけられている。セメント産業で排出されるCOは、セメント製造段階での、クリンカー原料となる石灰石の脱炭酸による。セメント産業でのCO低減については、クリンカー量を少なくした混合セメントが有効とされ、混合材に高炉スラグ微粉末を使用した高炉セメントなどが挙げられる。 On the other hand, from the viewpoint of global warming, the cement industry is positioned as an industry with a large amount of CO 2 emissions. The CO 2 emitted in the cement industry is due to decarboxylation of limestone, which is a clinker raw material, in the cement manufacturing stage. For reducing CO 2 in the cement industry, mixed cement with a reduced amount of clinker is effective, and examples include blast furnace cement using blast furnace slag fine powder as a mixed material.

田村浩章、「セメント工場の未来像 循環型社会への貢献の可能性」、セメント・コンクリート、No.623,Jan,1999,第4〜8頁Hiroaki Tamura, “Future Image of Cement Factory, Possibility of Contribution to Recycling Society”, Cement and Concrete, No.623, Jan, 1999, pages 4-8

しかしながら、混合材に高炉スラグ微粉末を使用した場合、初期強度が低下するという課題があった。従って本発明は、混合セメントにおいて、混合材に高炉スラグ微粉末を単独で使用した場合より高い初期強度を得ることが可能な水硬性組成物を提供するものである。   However, when blast furnace slag fine powder is used for the mixed material, there is a problem that the initial strength is lowered. Therefore, the present invention provides a hydraulic composition capable of obtaining a higher initial strength in mixed cement than when blast furnace slag fine powder is used alone as a mixed material.

本発明者らは、上記課題を解決すべく鋭意研究を行なった。そして、ポルトランドセメントに混合材を含有した水硬性組成物において、混合材として高炉スラグ微粉末と石灰石微粉末を併用し、さらにその混合割合を適正範囲に調整することにより、高炉スラグ微粉末を単独で使用した場合よりも高い初期強度発現性を得ることが可能であることを見出し、本発明を完成させるに至った。   The present inventors have intensively studied to solve the above problems. And in the hydraulic composition containing the mixed material in Portland cement, the blast furnace slag fine powder is used alone by combining the blast furnace slag fine powder and the limestone fine powder as the mixed material, and further adjusting the mixing ratio to an appropriate range. It was found that it was possible to obtain a higher initial strength than when used in the present invention, and the present invention was completed.

即ち本発明は、ポルトランドセメントクリンカー40〜95質量部、混合材5〜60質量部(但し、ポルトランドセメントクリンカーと混合材の合計を100質量部とする。)、セッコウを全組成物あたりSO換算で1〜4質量部含む水硬性組成物であって、前記混合材が高炉スラグ微粉末35〜80質量%、石灰石微粉末20〜65質量%である水硬性組成物である。 That is, according to the present invention, the Portland cement clinker is 40 to 95 parts by mass, the mixed material is 5 to 60 parts by mass (provided that the total of the Portland cement clinker and the mixed material is 100 parts by mass), and gypsum is converted into SO 3 per total composition. 1 to 4 parts by mass of the hydraulic composition, wherein the mixture is 35 to 80% by mass of blast furnace slag fine powder and 20 to 65% by mass of limestone fine powder.

本発明によれば、セメントに高炉スラグ微粉末を単独で混合する場合よりも高い7日強度が得られ、従来の水硬性組成物には無い優れた特性を発揮する水硬性組成物を製造することができ、その工業的価値は極めて高いものである。   According to the present invention, a 7-day strength higher than that obtained when blast furnace slag fine powder is mixed with cement alone is obtained, and a hydraulic composition that exhibits superior properties not found in conventional hydraulic compositions is produced. And its industrial value is extremely high.

本発明で使用するポルトランドセメントクリンカーは、セメントとした際に汎用性性状を示す公知のクリンカーを採用することが可能であり、具体的には、普通ポルトランドセメント用クリンカーや早強ポルトランドセメント用クリンカー等が該当する。ポルトランドセメントクリンカーの粉末度は、汎用的に使用される範囲のものであれば良く、3000〜5000cm/gに調整されていることが好ましく、セッコウを添加して調整されても良い。 The Portland cement clinker used in the present invention can adopt a known clinker that exhibits general-purpose properties when used as a cement. Specifically, a normal clinker for Portland cement, a clinker for early strength Portland cement, etc. Is applicable. The fineness of the Portland cement clinker is not particularly limited as long as it is used within a general range, and is preferably adjusted to 3000 to 5000 cm 2 / g, and may be adjusted by adding gypsum.

本発明で用いられる好適なポルトランドセメントクリンカーの有する鉱物組成(ボーグ式による)を示すと、CSが50〜75%、CSが5〜20%、CAが7〜15%、CAFが7〜15.%程度である。 When showing the mineral composition (according to the Borg formula) of the preferred Portland cement clinker used in the present invention, C 3 S is 50 to 75%, C 2 S is 5 to 20%, C 3 A is 7 to 15%, C 4 AF is about 7 to 15.%.

本発明で使用する上記ポルトランドセメントクリンカーを製造する方法は特に限定されることがなく、公知のセメント(クリンカー)原料を、所望の各鉱物比率及び係数となるように所定の割合で調製混合し、公知の方法(例えば、SPキルンやNSPキルン等)で焼成することにより容易に得ることができる。   The method for producing the Portland cement clinker used in the present invention is not particularly limited, and a known cement (clinker) raw material is prepared and mixed at a predetermined ratio so as to have a desired mineral ratio and coefficient, It can be easily obtained by firing by a known method (for example, SP kiln or NSP kiln).

当該セメント原料の調製混合方法も公知の方法を適宜採用すればよい。例えば、事前に廃棄物、副産物およびその他の原料(石灰石、生石灰、消石灰等のCaO源、珪石等のSiO源、粘土等のAl源、鉄源等のFe源など)の組成を測定し、これら原料中の各成分割合から上記範囲になるように各原料の調合割合を計算し、その割合で原料を調合すればよい。 As a method for preparing and mixing the cement raw material, a known method may be adopted as appropriate. For example, waste, by-products and other raw materials in advance (CaO sources such as limestone, quicklime and slaked lime, SiO 2 sources such as silica, Al 2 O 3 sources such as clay, Fe 2 O 3 sources such as iron sources, etc.) Is measured, the blending ratio of each raw material is calculated so as to be within the above range from the ratio of each component in these raw materials, and the raw material is blended at that ratio.

なお、本発明で使用するポルトランドセメントクリンカーの製造に用いる原料は、従来ポルトランドセメントクリンカーの製造において使用される原料と同様なものが特に制限なく使用される。廃棄物、副産物等を利用することも、無論可能である。   In addition, the raw material used for manufacture of the Portland cement clinker used in the present invention is the same as the raw material conventionally used in the manufacture of Portland cement clinker without particular limitation. Of course, it is possible to use waste and by-products.

本発明で使用するポルトランドセメントクリンカーの製造において、廃棄物、副産物等から一種以上を使用することは、廃棄物、副産物等の有効利用を促進する観点から好ましいことである。使用可能な廃棄物・副産物をより具体的に例示すると、高炉スラグ、製鋼スラグ、非鉄鉱滓、石炭灰、下水汚泥、浄水汚泥、製紙スラッジ、建設発生土、鋳物砂、ばいじん、焼却飛灰、溶融飛灰、塩素バイパスダスト、木屑、廃白土、ボタ、廃タイヤ、貝殻、都市ごみやその焼却灰等が挙げられる(なお、これらの中には、セメント原料になるとともに熱エネルギー源となるものもある)。   In the production of the Portland cement clinker used in the present invention, it is preferable to use one or more of wastes, by-products and the like from the viewpoint of promoting effective utilization of wastes, by-products and the like. Specific examples of usable waste and by-products include blast furnace slag, steelmaking slag, non-ferrous iron slag, coal ash, sewage sludge, purified water sludge, papermaking sludge, construction generated soil, foundry sand, dust, incineration fly ash, melting Examples include fly ash, chlorine bypass dust, wood scrap, waste white clay, waste, tires, shells, municipal waste and incinerated ash. is there).

本発明の水硬性組成物は、上記ポルトランドセメントクリンカーに加えて、混合材を含む。該混合材は高炉スラグ微粉末及び石灰石微粉末を必須成分とする。   The hydraulic composition of the present invention contains a mixed material in addition to the Portland cement clinker. The mixed material contains blast furnace slag fine powder and limestone fine powder as essential components.

本発明の水硬性組成物において、混合材として用いる高炉スラグ微粉末は、セメント混合材として公知の高炉スラグ微粉末を用いることができる。具体的には、製鉄所より副産物として副生する高炉スラグを粉砕したものであれば制限なく使用することができる。高炉スラグ微粉末の粉末度は、汎用的に使用される範囲のものであれば良く、3000〜8000cm/gに調整されていることが好ましい。 In the hydraulic composition of the present invention, the blast furnace slag fine powder used as a mixing material may be a known blast furnace slag fine powder as a cement mixing material. Specifically, any pulverized blast furnace slag produced as a by-product from the steelworks can be used without limitation. The fineness of the blast furnace slag fine powder may be in a range that is generally used, and is preferably adjusted to 3000 to 8000 cm 2 / g.

本発明の水硬性組成物において、混合材として用いる石灰石微粉末は、セメント混合材として公知の石灰石微粉末を用いることができる。具体的には、炭酸カルシウムの含有率が90質量部以上、かつ、酸化アルミニウムの含有率が1.0質量部以下の品質をもつ石灰石であれば制限なく使用することができる。石灰石微粉末の粉末度は、汎用的に使用されている範囲のものであれば良く、3000〜6000cm/gに調整されていることが好ましい。 In the hydraulic composition of the present invention, the limestone fine powder used as the mixing material may be a known limestone fine powder as the cement mixing material. Specifically, any limestone having a quality with a calcium carbonate content of 90 parts by mass or more and an aluminum oxide content of 1.0 parts by mass or less can be used without limitation. The fineness of the fine limestone powder may be in a range that is used for general purposes, and is preferably adjusted to 3000 to 6000 cm 2 / g.

本発明において、混合材の割合は5〜60質量部(但し、ポルトランドセメントクリンカーと混合材の合計を100質量部とする。)である。混合材量が5質量部未満の場合、高炉スラグ微粉末と石灰石微粉末を下記割合で混合しても初期強度の増進効果が得られない。一方、60質量部を超えると、十分な強度発現性を得ることが難しくなる。   In the present invention, the ratio of the mixed material is 5 to 60 parts by mass (provided that the total of the Portland cement clinker and the mixed material is 100 parts by mass). When the amount of the mixed material is less than 5 parts by mass, even if the blast furnace slag fine powder and the limestone fine powder are mixed at the following ratio, the effect of increasing the initial strength cannot be obtained. On the other hand, if it exceeds 60 parts by mass, it will be difficult to obtain sufficient strength development.

高炉スラグ微粉末と石灰石微粉末の適切な混合割合は、高炉スラグ微粉末と石灰石微粉末の合計100質量%に対して高炉スラグ微粉末35〜80質量%、石灰石微粉末20〜65質量%である。高炉スラグ微粉末が35質量%未満かつ80質量%以上では十分な効果は得られない。さらに好ましくは、高炉スラグ微粉末50〜75質量%、石灰石微粉末25〜50質量%であり、この範囲では初期強度発現性が特に良好なものとなる。   The appropriate mixing ratio of the blast furnace slag fine powder and the limestone fine powder is 35 to 80% by mass of the blast furnace slag fine powder and 20 to 65% by mass of the limestone fine powder with respect to the total 100% by mass of the blast furnace slag fine powder and the limestone fine powder. is there. If the blast furnace slag fine powder is less than 35% by mass and 80% by mass or more, a sufficient effect cannot be obtained. More preferably, the blast furnace slag fine powder is 50 to 75% by mass and the limestone fine powder is 25 to 50% by mass. In this range, the initial strength development is particularly good.

本発明の水硬性組成物には、凝結性能を制御するためセッコウを含む。使用するセッコウについては、二水セッコウ、半水セッコウ、無水セッコウ等のセメント製造原料として公知のセッコウが特に制限なく使用できる。具体的には、排煙脱硫セッコウ、リン酸セッコウ等の副産二水セッコウや天然の二水セッコウ、半水セッコウ、II型無水セッコウ等が挙げられる。石膏の添加量は、全組成物あたりSO換算で、1〜4質量%となるように添加し、より好ましくは1〜3質量%である。 The hydraulic composition of the present invention contains gypsum to control the setting performance. About the gypsum used, well-known gypsum can be used without a restriction | limiting especially as cement manufacturing raw materials, such as a two-water gypsum, a half-water gypsum, and anhydrous gypsum. Specifically, by-product dihydrate gypsum such as flue gas desulfurization gypsum and phosphate gypsum, natural dihydrate gypsum, semi-water gypsum, type II anhydrous gypsum and the like can be mentioned. Amount of gypsum is converted to SO 3 per the total composition, it was added in an amount of 1-4% by weight, more preferably 1 to 3% by weight.

本発明の水硬性組成物を構成するポルトランドセメントクリンカー、高炉スラグ微粉末、石灰石微粉末およびセッコウの粉末度を調製するための粉砕方法については、公知の技術が特に制限なく使用でき、各成分を個別に粉砕後、混合しても良いし、混合後に粉砕してもよい。粉砕機としてはボールミル、竪型ミル等が使用できる。   Regarding the pulverization method for preparing the fineness of Portland cement clinker, blast furnace slag fine powder, limestone fine powder and gypsum constituting the hydraulic composition of the present invention, known techniques can be used without any particular limitation. They may be pulverized individually and then mixed, or pulverized after mixing. As the pulverizer, a ball mill, a vertical mill or the like can be used.

本発明の水硬性組成物は、混合セメントと同等として使用することができる。また、土壌固化材等の固化材の構成成分として使用することも可能である。   The hydraulic composition of the present invention can be used as the equivalent of mixed cement. It can also be used as a constituent of a solidifying material such as a soil solidifying material.

以下、実施例により本発明をより具体的に説明するが、本発明はこれらの実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

普通ポルトランドセメントクリンカーにSO換算で2質量部となるようにセッコウを添加し、Blaine法による比表面積が3200cm/gとなるように混合粉砕した。高炉スラグ微粉末は、Blaine法による比表面積が4000cm/gとなるように粉砕した。石灰石微粉末は、Blaine法による比表面積が4400cm/gとなるように粉砕した。上記のセッコウを含むポルトランドセメントクリンカーと高炉スラグ微粉末および石灰石微粉末を用いて各水硬性組成物を製造した。得られた水硬性組成物のモルタル圧縮強さを測定した。モルタル圧縮強さは、JIS R 5201に準拠する方法により測定した。 Gypsum was added to ordinary Portland cement clinker so as to be 2 parts by mass in terms of SO 3 , and mixed and ground so that the specific surface area by the Blaine method would be 3200 cm 2 / g. The ground granulated blast furnace slag was pulverized so that the specific surface area by the Blaine method was 4000 cm 2 / g. The limestone fine powder was pulverized so that the specific surface area by the Blaine method was 4400 cm 2 / g. Each hydraulic composition was manufactured using the above-mentioned Portland cement clinker containing gypsum, fine blast furnace slag powder and fine limestone powder. The mortar compressive strength of the obtained hydraulic composition was measured. The mortar compressive strength was measured by a method based on JIS R 5201.

各実施例の混合材添加量、モルタル圧縮強さ等を表に示す。   The amount of mixed material added, the mortar compressive strength, etc. of each example are shown in the table.

Figure 2016064940
Figure 2016064940

参考例及び比較例1、3、5より高炉スラグ微粉末の添加量の増加により、7日強度は低下を示す。   The strength of the 7th day shows a decrease due to an increase in the amount of blast furnace slag fine powder added from Reference Examples and Comparative Examples 1, 3, and 5.

比較例1、実施例1、2および比較例2は、全組成物あたりSO換算で1.8質量部のセッコウを含む混合材含有量10質量部のものに対して、比較例3、実施例3、4および比較例4は、全組成物あたりSO換算で1.4質量部のセッコウを含む混合材含有量30質量部のものに対して、比較例5、実施例5、6および比較例6は、全組成物あたりSO換算で1.1質量部のセッコウを含む混合材含有量45質量部のものに対して、高炉スラグ微粉末と石灰石微粉末の混合割合を変化させた実験結果である。高炉スラグ微粉末が50および75質量部において、7日強度が高炉スラグ微粉末を単独で使用した場合(比較例1、3、5)および高炉スラグ微粉末の混合割合が35質量部未満の場合(比較例2、4、6)より高い値を示していることがわかる。 Comparative Example 1, Examples 1 and 2 and Comparative Example 2 were conducted for Comparative Example 3, which had a mixed material content of 10 parts by mass containing 1.8 parts by mass of gypsum in terms of SO 3 per total composition. Examples 3 and 4 and Comparative Example 4 are those in which Comparative Example 5, Examples 5 and 6 and Comparative Example 5 and Examples 5 and 6 were compared to those having a mixed material content of 30 parts by mass containing 1.4 parts by mass of gypsum in terms of SO 3 per total composition. In Comparative Example 6, the mixing ratio of the blast furnace slag fine powder and the limestone fine powder was changed with respect to the mixture having a mixed material content of 45 parts by mass containing 1.1 parts by mass of gypsum in terms of SO 3 per total composition. It is an experimental result. When the blast furnace slag fine powder is 50 and 75 parts by mass, the strength for 7 days when the blast furnace slag fine powder is used alone (Comparative Examples 1, 3, 5) and the mixing ratio of the blast furnace slag fine powder is less than 35 parts by mass It can be seen that the values are higher than those of (Comparative Examples 2, 4, 6).

Claims (1)

ポルトランドセメントクリンカー40〜95質量部、混合材5〜60質量部(但し、ポルトランドセメントクリンカーと混合材の合計を100質量部とする。)、セッコウを全組成物あたりSO換算で1〜4質量%含む水硬性組成物であって、前記混合材が高炉スラグ微粉末35〜80質量%、石灰石微粉末20〜65質量%である水硬性組成物。 40 to 95 parts by mass of Portland cement clinker, 5 to 60 parts by mass of the mixed material (however, the total of the Portland cement clinker and the mixed material is 100 parts by mass), 1 to 4 masses of gypsum in terms of SO 3 per total composition A hydraulic composition containing 35% by mass of blast furnace slag fine powder and 20-65% by mass of limestone fine powder.
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