建材

アプリケーションデータベース

Please contact us for an individual consultation.

パンフレット (1)

Cement

情報誌 "the sample" (5)

No. 36
粉砕はアート－現代の粉砕技術

No. 34
2009年
新製品

No. 33
試料調整の具体例　＆　レッチェ新商品

No. 29
新製品　2007年　新発売 GOLD　RUSHｷｬﾝﾍﾟｰﾝ

No. 28
Think big but grind fine!大型粉砕機特集号。

アプリケーションレポート (15)

エアジェットシーブAS200ジェットを使った凝集粉末の分級
エアジェットシーブは、40μm以下の非常に細かい粉体の乾式分級に広く用いられています。また、振動式のふるい振とう機に比べて極めて短時間で分級ができるので、250μmまでの粉体にも広く採用されています。

できる限り純粋に
理想的な状態で粉砕が行われても、試料と粉砕容器の表面がこすれて起きる機械的ストレスによって粉砕容器の表面が摩耗します。しかし、粉砕機と粉砕容器を適切に選択することで、この摩耗を軽減することは可能です。もし試料を100μm未満に粉砕する必要がある場合は、非常に強い力が必要なので、その分、摩耗も大きくなります。

AS450コントロールを使った大容量の分級
大量のバルク材の分級には通常振動ふるい機が使われますが、ほとんどの振動ふるい機はバネの縦方向の振動を使って試験ふるいを振とうさせます。一方、AS450コントロールで採用されている分級方法は、縦・横・ねじれの三次元運動を使います。これは、試料を均等に試験ふるいの全面に移行させるので最も効果的な分級方法です。

蛍光X線分析用の試料調製
蛍光X線分析は質量分析に広く使われている分析方法ですが、試料調製が正しく行われないと正確で再現性の高い分析結果が得られません。

注目される資源の再生
植物の代表サンプル作成には経験が必要　切迫した原料不足を背景に産業界は、再生可能な資源の利用技術開発に注力しています。その中でも様々な植物は繊維、顔料、医薬品、燃料、油脂および緩衝材の原料として脚光を浴びています。しかし、植物はその複雑な組成や成分のため、分析用の試料調製が困難なもののひとつです。予備粉砕から微粉砕までの最適な粉砕方法を見つけ出すのは簡単なことではなく、経験とノウハウが必要です。

Representative results require adequate sample preparation
The following situation is typical for many production plants: After a routine quality check, the production process is stopped or an already produced batch is suspended, because the analysis results were not within the relevant critical values. But does the tested product really deviate from the specifications? The quality control managers are convinced of this because modern analysis instruments provide results with very low tolerances. The sample in question was tested several times and the result was confirmed. The question is why the product does not match the specifications although the production parameters have not been changed in any way.
The possibility that the tested product is indeed deficient cannot be excluded. However, it is often not the product itself which causes irregular analysis results but a lack of understanding of the steps which come before the analysis.

Secondary fuels – Energy for the cement industry
Due to decreasing resources and increasing market prices for primary fuels like oil, gas or coal, it is paramount for the cement industry to search for alternative energy sources. With regard to the CO2 emissions trading, a switch to energy sources which have a neutral CO2 balance can be rather profitable. Usually, these are non-fossil fuels. Industries with high energy consumption have made increasing use of alternative fuels during the last years. Accordingly, the use of so called secondary fuels (also waste derived fuels/wdf or refuse derived fuels/rdf) has gained importance. These are mostly combustible fractions of domestic or industrial waste which cannot be recycled.

Air Jet Sieving of Bulk Materials
Particle size analysis and particle size distribution are important criteria for the quality control of bulk materials. In a running production process, the results of a quality check must be available quickly to allow for immediate adjustment of the production parameters. Depending on the expected particle size and sample volume, different sieving methods and sieving machines are suitable for analysis. The method used for particle size analysis is primarily determined by the fineness of the material to be sieved. For dry sieving of samples with particle sizes below 40 microns, air jet sieving is the method of choice.

Representative sample preparation for XRF analysis
Preparing homogeneous samples by milling

Fast and Reproducible Sample Preparation with a Vibratory Disc Mill
The Vibratory Disc Mill RS 200 from Retsch is used for the quick, loss-free grinding of hard, brittle and fibrous materials to analytical fineness.

Cement - representative sample preparation is important
To produce high-quality cement, the mineralogical and chemical composition of raw materials as well as intermediate and finished products has to be determined. At each stage of the production, samples have to be taken, processed and analysed to ensure quality control without gaps. Retsch offers a range of instruments that are used for sample preparation during the complete production process, from the quarrying of the raw materials to the final product. The typical sample preparation process involves preliminary size reduction, sample division and fine size reduction before the sample can be submitted to further analyses....

Size reduction within the context of sample preparation
In general “size reduction” is taken to mean the disintegration of solid substances by mechanical forces without altering their state.

The preparation of samples of solid substances for spectroscopic analysis
X-ray fluorescence spectrometry is one of the most versatile multi-element methods of chemical analysis. The technique is based on excitation of fluorescent radiation from a sample by bombarding it with high energy X-ray quanta and subsequent study of the characteristic X-ray radiation emitted by its elements.

Höchstleistung im Doppelpack
Mit der PM 100 und der PM 200 präsentiert Retsch eine neue Generation von Planeten-Kugelmühlen mit einer bzw. zwei Mahlstellen, die in diesem Produktsegment neue Leistungsstandards setzen.

Molienda ultrarrápida y ultrafina
El nuevo molino ultracentrífugo ZM 200 de RETSCH es un molino de rotor no sólo extremadamente rápido y cuidadoso con el material molido, sino también de uso universal gracias a su amplia gama de accesorios.