A Comparative Study on Acid Leaching of Low Grade Manganese Ore Using Some Industrial Wastes as Reductants

Ore samples, believed to be low grade manganese ore were characterized using XRD, XRF and SEM, before being ground further into very fine particle sizes going through a preliminary leaching process. Sulfuric acid was chosen as the leachant, and leaching was done without any presence of reducing agents.

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Research status of microwave-assisted reduction technology of pyrolusite

Current Microwave Chemistry ◽

10.2174/2213335607999201222095248 ◽

2020 ◽

Vol 07 ◽

Author(s):

Li Qiannan ◽

Ling Yeqing ◽

Zheng Hewen ◽

Yang Zhi

Keyword(s):

Metallurgical Industry ◽

Raw Material ◽

Utilization Efficiency ◽

Low Grade ◽

Manganese Ore ◽

Effective Utilization ◽

Research Status ◽

Strategic Position ◽

Research Intensity ◽

Stable Development

: Manganese ore is an important metallurgical raw material that holds an important strategic position in the national economy of China. However, the grade of manganese ore in the country is mostly low, and the utilization efficiency of lowgrade manganese ore resources is low, which seriously restrict the healthy and stable development of China’s metallurgical industry. As a new green heating method, microwave is expected to address the problems of conventional methods and realize the effective utilization of low-grade manganese ore. In this paper, the research status of the microwave composite reduction of pyrolusite in recent years is reviewed. Microwave plays an important role in metallurgy, and it is the current direction pursued to improve the research intensity of microwave heating and extend it to actual industrial processes.

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Extraction of Cellulose Nanofibrils with Ultraviolet Blocking from Agro-industrial Wastes: A Comparative Study

Fibers and Polymers ◽

10.1007/s12221-021-0196-6 ◽

2021 ◽

Vol 22 (1) ◽

pp. 59-68

Author(s):

Xin Zhao ◽

Fangchao Cheng ◽

Yingcheng Hu

Keyword(s):

Comparative Study ◽

Cellulose Nanofibrils ◽

Industrial Wastes

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Evaluation of Acid Leaching of Low Grade Chalcopyrite Using Ozone by Statistical Analysis

Canadian Metallurgical Quarterly ◽

10.1179/cmq.2010.49.3.219 ◽

2010 ◽

Vol 49 (3) ◽

pp. 219-226 ◽

Cited By ~ 4

Author(s):

F. R. Carrillo-Pedroza ◽

M. A. Sánchez-Castillo ◽

M. J. Soria-Aguilar ◽

A. Martínez-Luévanos ◽

E. C. Gutiérrez

Keyword(s):

Statistical Analysis ◽

Acid Leaching ◽

Low Grade

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Production of Porous Materials by Dealumination of Alumina-Rich Zeolites

MRS Proceedings ◽

10.1557/proc-371-123 ◽

1994 ◽

Vol 371 ◽

Cited By ~ 5

Author(s):

R. Le Van Mao ◽

G. Denes ◽

N.T.C. Vo ◽

J.A. Lavigne ◽

S.T. Le

Keyword(s):

Comparative Study ◽

Pore Size Distribution ◽

Mesoporous Materials ◽

Acid Leaching ◽

Textural Properties ◽

Zeolite A ◽

New Materials ◽

Ammonium Hexafluorosilicate ◽

Void Volumes ◽

Exchange Properties

AbstractA comparative study of chemical and textural properties for materials obtained by three different methods of dealumination of alumina-rich parent Ca-A zeolite showed that the method using ammonium hexafluorosilicate (AFS) resulted in the most interesting developments of mesoporous materials, with much higher void volumes and cation exchange properties than obtained by acid leaching or hydrothermal treatment. AFS treatment on both the Na and Ca forms of zeolite A resulted in materials with 12 nm sized mesopores, whereas smaller mesopores of about 4 nm were obtained when using the higher Si/Al ratio parent zeolite Na-X. Pore size distribution profiles obtained for these new materials are fairly narrow, indicating homogeneous mesopore sized solids.

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