Demineralization study of Indian Assam coking coal by sodium hydroxide leaching

被引：10

作者：

Kumar, M

Gupta, RC

机构：

[1] Dept. of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi

[2] Dept. of Metallurgical Engineering, Institute of Technology, Banaras Hindu University

来源：

ENERGY SOURCES | 1997年 / 19卷 / 07期

关键词：

Assam coking coal; demineralization; NaOH leaching;

D O I：

10.1080/00908319708908886

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The propose of this study was to examine the ash removal efficiency of sodium hydroxide leaching from Assam coking coal so that it could be used for the manufacture of graphite electrodes. The parameters tested were sodium hydroxide concentration, particle size of coal, NaOH solution / coal ratio, leaching temperature and time, and heat treatment of coal. Increase in NaOH concentration up to 500 gL(-1) was found to increase the extent of ash removal. The ash content of the leached coal decreased with decrease in particle size, but very finely ground (-72 mesh) particles reduced the ash removal rate. increase In leaching temperature (50-120 degrees C) and time (30-180 min) considerably reduced the ash content of the leached coal. Heat-treated (at 1300 degrees C) coal (i.e., coke) has much lower ash removal efficiency than raw coal.

引用

页码：723 / 730

页数：8

共 15 条

[1]

*BUR IND STAND, 1969, 1350 BUR IND STAND 1, V3

[2]

GERARD G, 1963, CHEM BAYER PROCESS E

[3] INFLUENCE OF STRUCTURAL PARAMETERS ON COAL CHAR GASIFICATION .1. NON-CATALYTIC STEAM GASIFICATION [J].