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grinding analysis of Indian coal using response surface methodology

International Journal of Coal Science & Technology 2016年第2期3卷 184-190页

作者： Twinkle Singh Aishwarya Awasthi Pranjal Tripathi Shina Gautam Alok Gautam Jaypee University of Engineering & Technology A-B RoadRaghogarh Guna India Shroff S. R. Rotary Institute of Chemical Technology Ankleshwar Gujarat India

The present work discusses a systematic approach to model grinding parameters of coal in a ball mill. A three level Box-Behnken design combined with response surface methodology using second order model was applied to the experiments done according to the model requirement. Three parameters ball charge （numbers 10-20）, coal content （100-200 g） and the grinding time （4-8 rain） were chosen for the experiments as well as for the modeling work. Coal fineness is defined as the dso （80 % passing size）. A quadratic model was developed to show the effect of parameters and their interaction with fineness of the product. Three different sizes （4, 1 and 0.65 mm） of Indian coal were used. The model equations for each fraction were developed and different sets of experiments were performed. The predicted values of the fineness of coal were in good agreement with the experimental results （R2 values of dso varies between 0.97 and 0.99）. Fine size of three different coal sizes were obtained with larger ball charge with less grinding time and less solid content. This work represents the efficient use of response surface methodology and the Box-Behnken design use for grinding of Indian coal.

关键词： Coal grinding Ball mill grinding time Response surface methodology

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Characterization of the Gold Ore to Acquire an Optimum Degree of Liberation

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Journal of Environmental Science and Engineering(B) 2017年第6期6卷 332-338页

作者： Waterman Sulistyana Bargawa Eko Hardiyanto Department of Mining Engineering University of Pembangunan Nasional Veteran Yogyakarta Yogyakarta 55283 Indonesia

Gold ore processing is often ineffective in obtaining gold metal. Various methods have been successfully developed on an industrial scale, but small-scale gold mines are often problematic. The problem of inefficiency of processing is caused by gold ore characterization and evaluation of gold ore preparation process is not implemented. In this study, the conditions of gold ore deposits have a thin thickness （vein）. These gold ore deposits have an economic value if they are developed by traditional gold mining. The objective of the research is to identify and characterize gold ore as well as to analyze the optimum condition to obtain the perfect gold mineral liberation degree. Research methods include characterization of gold ore geology, sampling for test preparation using rod mill （amalgamation）, gold mineral liberation using time variables and number of rods. After the grinding process, grain size analysis is performed with various mesh sizes, and the analysis of each fraction uses a polarization microscope. The results show that gold ore minerals are associated with pyrite, chalcopyrite, galena and gangue minerals. Gold minerals are fully liberated at a certain size. The results of this research are very useful for the gold ore grinding process to obtain an efficient gold processing.

关键词： Characterization gold ore grinding size distribution grinding time rod degree of liberation.

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