Study on the Production of Ultraclean Coal

超洁净煤生产研究

• 批准号: 03650508
• 负责人: HIRAJIMA Tsuyoshi
• 金额: $ 1.6万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650508/
• 关键词: Ultraclean Coal; Superclean Coal; Deashing; Coal; Liberation Degree; Ash Content Prediction; Flotation Column; Mineral size distribution; ウルトラクリ-ンコ-ル; 脱硫; 超微粉砕

Studies on the production of ultraclean coal were carried out. The results are summarized as follows;1) A total of six domestic and foreign coal samples were used. The basic properties were initially measured and the floatability, density of pure coal, calorific value and minimum limit of ash content were determined.2) Impurity minerals in coal were grouped into quartz, pyrite, kaolinite and iron oxide minerals. The changes of the size distribution of each mineral before and after crushing and gravity separation were utilized to determine their liberation characteristics.3) Based on the results of Inductively Coupled Plasma Automatic Emission Spectroscopy of high temperature ash, it was shown that the minimum limit of ash content depends on the type and amount of minerals which are difficult to remove. A new method for predicting the minimum limit of ash content was demonstrated.4) The effects of grinding parameters on grindability of coal were investigated. The wear of the internal pa … More rts of media agitated mill was caused by the hard minerals present in the coal. The grinding time needed to reduce the coal to a specified size was shortened by using a grinding media with smaller diameter and/or by increasing the speed of agitation.5) The estimation of liberation degree by using the liberation model developed from this research was demonstrated.6) A new type of flotation column was built and modified. Comparative experiments using the new flotation column and other conventional coal cleaning methods were carried out. The results showed that the new flotation column was effective even with fine particles which are difficult to recover in conventional methods.7) The deashing of ultrafine coal using the method of agglomeration in water was superior than that using the release analysis method. Proper selection of bridging liquid was needed for each coal. The method for predicting the amount of minerals and the ash content in clean coal was established. The predicted results were in good agreement with the measured values from the method of agglomeration in water. Less

对超洁净煤的生产进行了研究，研究结果如下：1)对国内外6个煤样进行了初步测定，测定了纯煤的可浮性、密度、发热量和热值。 2)利用破碎和重力作用前后各矿物粒度分布的变化,将煤中的杂质矿物分为石英类、黄铁矿类、高岭石类和氧化铁类矿物。 3)基于高温灰分的电感耦合等离子体自动发射光谱分析结果表明,灰分含量的下限取决于难去除矿物的种类和数量。论证了预测灰分含量下限的方法。4) 研究了磨矿参数对煤可磨性的影响。介质搅拌磨内部零件的磨损是由磨矿中存在的硬矿物引起的。通过使用较小直径的研磨介质和/或通过提高搅拌速度，可以缩短将煤磨碎至指定尺寸所需的研磨时间。5）使用本研究开发的解放模型来估计解放度。 6）搭建了新型浮选塔，并对其与其他常规选煤方法进行了对比实验，结果表明，即使是难以处理的细颗粒，新型浮选塔也是有效的。以常规方式恢复7)采用水中团聚法对超细煤进行脱灰比采用释放分析法进行脱灰需要针对每种煤适当选择架桥液。洁净煤的预测结果与水中团聚法的测量值非常吻合。

项目成果

王 楠: "物理的選別法による石炭の脱灰性に関する研究(第2報)-石炭中の鉱物質の単体分離性-" 資源と素材.

王楠：“物理分选法煤炭脱灰特性研究（第二次报告）——煤中矿物质的可分离性——”资源与材料。