Influence of pretreatment on Na content analysis of Zhundong coal
DONG Qian
ZHANG Haixia
ZHU Zhiping
Abstract：In order to improve accuracy of Na content measurement,two Zhundong coal containing high Na were used as research objects. Four pretreatment methods which were stepwise extraction( Method 1 ),direct digestion( Method 2 ),815 ℃high temperature ashing ( Method 3),575 ℃ low temperature ashing( Method 4)were investigated to find out their influence on Na content measurement. The re-sults showed that,the sodium contents in Zhundong coal samples were very high,water-soluble Na accounted for more than 70%,the Na in the form of silicate accounted for less than 5%. The measurement results from high to low were Method 1,Method 4,Method 2,Method 3. There were no Na loss by Method 1 and the measurement results were accurate,while the experimental procedure was cumbersome and time-consuming. The content of Na gotten by Method 2,3,4 accounted for more than 75%,less than 60% and more than 85% of the Na gotten by Method 1. So treated by Method 4,the measurement of Na content became more accurate and rapid.
Keywords：Zhundong coalpretreatmentNa contentstepwise extractiondigestionashing
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 81-84,88 )