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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Phase and morphological transformation stages during carbothermal reduction nitridation process: From coal gasification slag wastes to Ca-alpha-SiAlON powders
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Phase and morphological transformation stages during carbothermal reduction nitridation process: From coal gasification slag wastes to Ca-alpha-SiAlON powders

机译：碳热还原氮化过程中的相态和形态转变阶段：从煤气化炉渣废物到Ca-alpha-SiAlON粉末

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Effective utilization of industrial solid wastes is of great benefit for environmental and economic needs. In order to clarify the theoretical issues and pave the way to synthesize high quality Ca-alpha-SiAlON powder from coal gasification slag by carbothermal reduction nitridation (CRN), in this study, the theoretical issues including the network structure of the slag as well as the phase and morphological transformation stages of raw slag during CRN process were comprehensively studied at different temperatures (1350, 1400, 1450 and 1500 degrees C). It was found that the CRN process was dominated by nitridation of the Ca-Si-Al-O glass component in slag. With the increase of processing temperature, spherical Ca-Si-Al-O particles were firstly nitrided into porous Ca-Si-Al-O-N spheres, plate-like O-SiAlON grains, and then nitrogen-rich SiAlONs (beta-SiAlON, 15R polytypoid and alpha-SiAlON). At the end of CRN, Ca-alpha-SiAlON was found to be the only SiAlON phase presenting elongated prismatic morphology. In addition, high concentration Ca-alpha-SiAlON powder was obtained through a two-step purification process with a conversion rate as high as 45 wt%. The obtained results shed light on the preparation of Ca-alpha-SiAlON products from coal gasification slag and related wastes. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：有效利用工业固体废物对于环境和经济需求具有极大的好处。为了阐明理论问题，并为通过碳热还原氮化（CRN）由煤气化炉渣合成高品质Ca-alpha-SiAlON粉铺平道路，在本研究中，理论问题包括炉渣的网络结构以及在不同温度（1350、1400、1450和1500摄氏度）下，对CRN过程中粗渣的相变和相变阶段进行了综合研究。已发现，CRN工艺主要受炉渣中Ca-Si-Al-O玻璃成分的氮化作用的影响。随着加工温度的升高，球形Ca-Si-Al-O颗粒首先被氮化成多孔Ca-Si-Al-ON球体，板状O-SiAlON晶粒，然后被富氮的SiAlONs（β-SiAlON，15R多型和α-SiAlON）。在CRN结束时，发现Ca-alpha-SiAlON是唯一呈现细长棱柱形形态的SiAlON相。另外，通过两步纯化工艺获得高浓度的Ca-α-SiAlON粉末，其转化率高达45重量％。获得的结果为从煤气化炉渣和相关废物制备Ca-alpha-SiAlON产品提供了启示。 （C）2016日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。

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