Al-Monohydrate (Boehmite) to Al-Trihydrate (Bayerite/Gibbsite) Transformation During High-Energy Milling

被引：15

作者：

Alex, T. C. ^{[1
]}

Kailath, A. J. ^{[1
]}

Kumar, Rakesh ^{[1
,2
]}

机构：

[1] CSIR Natl Met Lab, Jamshedpur 831007, Bihar, India

[2] Indian Inst Technol ISM, Dhanbad, Bihar, India

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2020年 / 51卷 / 02期

关键词：

GAMMA-ALUMINA; SURFACE; BEHAVIOR; BAUXITE; MECHANOCHEMISTRY; ACTIVATION; PARTICLES; HYDRATION; MINERALS; GIBBSITE;

D O I：

10.1007/s11663-020-01771-6

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The specific focus of this study is on the boehmite-water interaction during attrition milling of a boehmite prepared by thermal dehydroxylation of gibbsite. Various characterization studies confirm the formation of a new phase, bayerite (an Al-trihydroxide polymorph) during milling of boehmite with water as the dispersant. Bayerite is a more stable (thermodynamically) phase than boehmite. By forming bayerite, the free energy of the interacting system (consisting of disordered metastable boehmite and water) gets reduced. Such a transformation is of relevance in the digestion of Al-monohydrates in the Bayer process of alumina production. Furthermore, the presence of water during attrition milling itself is essential for the transformation. Bayerite does not form during attrition milling of the same boehmite in ethyl alcohol media and subsequent soaking in water up to 36 hours. Therefore, bayerite formation does not depend solely on structural degradation.

引用

收藏

页码：443 / 451

页数：9

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