熱重量測定による石灰石の分析と利用

DOI Web Site Web Site

書誌事項

タイトル別名
  • Analysis of Ore Grade of Limestone by Thermogravimetry
  • ネツ ジュウリョウ ソクテイ ニ ヨル セッカイセキ ノ ブンセキ ト リヨウ

この論文をさがす

抄録

This report treats an analysis of the ore grade of limestone by means of thermogravimetry. Although a simple wet chemical analysis (titration lime method) is well known for an analysis of the ore grade limestone, it is not easily employed at mine site because it requires an acid reagent and skill. Thermogravimetry with stepwise heating can be operated easily and safely. Limestone sample releases H2O and CO2 on heating. The ore grade of the sample is calculated by the sample weight ratio before and after the release of CO2. A stepwise heating maintains a sample at each reaction temperature constant while following three reactions have occurred:(1) 200°C; release of physically absorbed water (2) 650°C; release of structural water of clay minerals contained in the sample (3) 1, 100°C ; release of CO2.<BR>When the weight of the sample is the same as that of two minutes before, the sample is heated up to the next step.<BR>By this method, a sample which is sized under 5mm and weight 15 grams, for example, is analyzed in one hour without predrying. The correlative cofficient between the data obtained by the wet chemical method and those by this method is 0.995. This method has-been carried out in the Higasitani mine of Mitsubisi Mining & Cement Co, Ltd since 1986. Sample heating, weight measuring and ore grade calculation are performed by pocket-computer system. Theequipment does not require a special room for analysis and more than ten times larger amount of sample may be analyzed in a shorter time, comparing with the chemical method which is conventionally employed in Japanese mines.<BR>By use of this analyzing system, the dispersions of the ore grades have been reduced when raw materials of cement are mixed in cement producing process.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 104 (1210), 851-856, 1988

    一般社団法人 資源・素材学会

詳細情報 詳細情報について

問題の指摘

ページトップへ