What is petrographic analysis of coal?

What is petrographic analysis?

Petrography Analysis: Petrology is the study of rocks. A petrographic analysis is an in depth investigation of the chemical and physical features of a particular rock sample. A complete analysis should include macroscopic to microscopic investigations of the rock sample.

What do you mean by coal petrography?

Coal petrography is a microscopic technique used to determine a coal’s rank (degree of coalification) and type (amount and category of macerals). … Petrographic analysis can also be used to determine whether contaminants are present in the coal and to detect oxidised coal in the sample.

What is the importance of coal petrography?

Coal petrography plays an important role in determining size and distribution of macerals and mineral matter within the coal, and thereby improving the information on which plant designs and reserve estimations are based.

What is petrographic composition?

The petrographic composition of coal has a significant impact on the gasification process [3]. Coal is a heterogeneous mixture of organic and mineral matter. The organic matter contains vitrinite, liptinite, and inertinite macerals. … Vitrinite has a high oxygen content compared to other maceral groups.

What is geochemical analysis?

Geochemical analysis is the process through which scientists determine the chemical compounds that constitute Earth, its atmosphere, and its seas. To a lesser degree, geochemical analysis can also be used to understand extraterrestrial materials such as moon rocks or Martian soil samples.

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What are the macro component of coal?

There are four types of macro-components in coal: vitrain, clarain, durain, and fussian. These components correspond to anthraxylon, translucent attritus, opaque attritus, and fussain, respectively.

What is vitrinite composed of?

Chemically, it is composed of polymers, cellulose and lignin. The vitrinite group, which consists of various individual vitrinite macerals, is the most common component of coals. It is also abundant in kerogens that are derived from the same biogenic precursors as coals, namely land plants and humic peats.

What does Petrologist mean?

Petrology, scientific study of rocks that deals with their composition, texture, and structure; their occurrence and distribution; and their origin in relation to physicochemical conditions and geologic processes. It is concerned with all three major types of rocks—igneous, metamorphic, and sedimentary.

What is petrographic test of aggregates?

The petrographic examination in Devoll aggregates establish whether the aggregate contains chemically unstable minerals such as soluble sulfates, unstable sulfides that may form sulfuric acid or create distress in concrete exposed to high temperatures during service, or volumetrically unstable materials such as micas, …