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malaysia maharashtra drying processing coal gangue cost

Nov 23, 2015 In addition, the traditional preparation method is supercritical drying, which is complex and has safety issues. Here, we successfully prepare a SiO 2 Al 2 O 3 aerogel utilizing coal gangue as a raw material, which is a zero-cost mining waste. More importantly, ambient pressure drying used in this work overcomes the drawbacks of ...

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