- What is volatile material?
- Which coal has no caking power?
- What is the effect of volatile matter in coal?
- Which is preferred for high volatile coal and why?
- What are 4 types of coal?
- Which coal has highest water content?
- Is coal a ash?
- Is high volatile matter in coal Good?
- Which one is more volatile?
- Why bromine liquid is very volatile?
- What is ranking of coal?
- Which coal has highest ash content?
- What is heating value of coal?
- Which coal has highest volatile matter?
- Which liquid is the most volatile?
- Which country has the best quality coal?
- Which type of coal has the highest sulfur content?
- Does coal ash contain mercury?
What is volatile material?
Volatility describes how easily a substance will vaporize (turn into a gas or vapor).
A volatile substance can be defined as (1) a substance that evaporates readily at normal temperatures and/or (2) one that has a measurable vapor pressure.
The term volatile usually applies to liquids..
Which coal has no caking power?
Non Coking Coal does not have any caking properties and it is mainly used as thermal coal for power generation. It has a higher ash content and also used in industries like cement, fertilizer, glass, ceramic, paper, chemical and brick manufacturing.
What is the effect of volatile matter in coal?
The volatile content has a positive effect on the volatilization rate of arsenic in the initial stage of combustion. With the same level of ash content, high-volatile coals (>30%) own a larger volatilization rate of arsenic (0.55–0.6% s–1) than the low-volatile coals (<12%) (0.25% s–1).
Which is preferred for high volatile coal and why?
Generally, the highest value bituminous coals have a specific grade of plasticity, volatility and low ash content, especially with low carbonate, phosphorus, and sulfur. … Coking coal is best if it has a very narrow range of volatility and plasticity. This is measured by the free swelling index test.
What are 4 types of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.
Which coal has highest water content?
Anthracite coal is a dense, hard rock with a jet-86% and 98% carbon by weight, & it burns.Bituminous coal (in Indiana), contains between.69% & 86% carbon by weight.Sub-bituminous coal contains less carbon, more.Lignite coal, or brown coal, is a very soft coal that.contains up to 70% water by weight. Emits more.
Is coal a ash?
Coal ash is the waste that is left after coal is combusted (burned). It includes fly ash (fine powdery particles that are carried up the smoke stack and captured by pollution control devices) as well as coarser materials that fall to the bottom of the furnace. Most coal ash comes from coal-fired electric power plants.
Is high volatile matter in coal Good?
High-volatile matter may also be associated with spontaneous combustion, especially in low-rank coals (Fierro and others, 1999). Hence, knowledge of volatile matter is important for safety, handling, and transporting coal.
Which one is more volatile?
– Volatility of compounds depends on polarity and molar masses. – More polar the molecule, less volatile it is. – Lower molar mass results in more volatility. – Therefore, CHCl3 is most volatile of them all.
Why bromine liquid is very volatile?
A halogen element, bromine is a red volatile liquid at room temperature which has a reactivity between chlorine and iodine. … Bromine vapors are very toxic with inhalation.
What is ranking of coal?
Coal rank is the measure of the degree of organic metamorphism (coalification) of a coal, ranging from low-rank peat to high-rank meta-anthracite.
Which coal has highest ash content?
ligniteCoking coal- the carbon content is around 43%-86%. It is a type of bituminous coal. Hence, lignite has the least carbon content which means that it has the highest ash content.
What is heating value of coal?
The calorific value of coal is measured for almost all coal samples. Calorific value is a measure of the amount of energy produced from a unit weight of coal when it is combusted in oxygen. …
Which coal has highest volatile matter?
AnthraciteThe four ranks are: Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.
Which liquid is the most volatile?
Bromine liquid readily transitions to vapor at room temperature, indicating a high volatility.
Which country has the best quality coal?
Experts told Fact Check that Australia’s coal is on average high quality as a result of its low moisture and ash content, and high carbon content, compared with other countries, particularly Indonesia, the largest coal exporter in the world.
Which type of coal has the highest sulfur content?
Lignite coalLignite coal Lignite is brownish black, has a high moisture content (up to 45 %), and a high sulphur content. Lignite is more like soil than a rock and tends to disintegrate when exposed to the weather.
Does coal ash contain mercury?
Coal contains trace levels of trace elements (such as arsenic, barium, beryllium, boron, cadmium, chromium, thallium, selenium, molybdenum and mercury), many of which are highly toxic to humans and other life.