Classification of different types of natural bitumen
The origin and formation of natural bitumen is from crude oil and based on the method of formation, physical properties, solubility in CS2 and chemical composition, natural bitumen is divided into different groups such as asphaltic pyrobitumen, non-asphaltic pyrobitumen, asphaltite, etc.
These groups are divided into different branches, for example asphaltites are divided into three groups:
1- Gilsonite
2- Grahamite
3- Glance screw
Gilsonite group is one of the best and most famous natural bitumen groups.
Different types of bitumen:
1- Pyrobitumen:
A general term for black, relatively hard and non-volatile natural substances, including hydrocarbons that are sometimes associated with oxygenated components and sometimes associated with minerals. They are insoluble and relatively insoluble in CS2.
2- Asphaltic pyrobitumen:
It is a part of pyrobitumen and it is black in color. Contains hydrocarbons free of oxygen components.
Sometimes they are combined with mineral and insoluble materials and are divided into the following groups:
Elatrite, wurtzlite, impzonite and pyrobitumen asphaltic rocks
3- Non-asphaltic pyrobitumen:
They are a part of pyrobitumen and are black in color. It is relatively hard and insoluble and contains hydrocarbons with
Oxygenated components. It is accompanied by minerals and is insoluble in large quantities in CS2 and coal groups
peat, lignite, charcoal, bituminous coal, anthracite coal are divided.
4- Asphaltites:
The black bituminous material is relatively hard and non-volatile. Basically, it contains hydrocarbons free of oxygen
Sometimes they are accompanied by minerals. They are difficult to melt and are soluble in CS2 in large quantities.
As mentioned earlier, the asphaltite group is divided into three groups: gilsonite, grahamite and glans pitch.
Asphaltites are distinguished due to the following characteristics:
A- High solubility in organic solutions
B- high purity and stable properties
C- High nitrogen content
D- high molecular weight
Different types of Gilsonite
For commercial purposes, Gilsonite is classified and marketed based on its melting point, fracture degree, and granularity degree, and its types are as follows:
Ordinary Gilsonite
It has a melting point of 163 degrees Celsius with coarse fractures and is easily converted into small particles. This type of mineral bitumen is found in abundance near oil reservoirs in the division of natural bitumen. This type of gilsonite mines usually have significant reserves. which is placed in different layers of the earth and in each layer the material has different quality and ash. Also, there are such bitumen mines in the west of Iran, in the Zagros mountains, in Kermansheh province, Gilangreb city, which can meet a significant amount of the needs of domestic and foreign consumers. Consumers of mineral bitumen bitumen can purchase by directly referring to bitumen mines and visiting such mines.
Selected Gilsonite (Select)
It has a melting point of about 142 degrees Celsius with shiny fracture surfaces and does not easily turn into small particles.
Select Screened Gilsonite
It has characteristics similar to selective gilsonite, but it does not have fine particles and is in the form of granules. This type of mineral has its own uses and uses.
Gilsonite is used in making car battery body, polishes, rubber, paint and compound. Also, this mineral is used in making various types of waterproofing and isogam.
Factories producing isogam for construction, since by mixing this valuable material with bitumen, it can significantly increase the durability and quality of isogam, they are mostly buyers of this mineral.
Grahamite
Another mineral of the asphaltite family is grahamite, which can be characterized by being harder,
More specific weight, more brittleness and higher melting point and finally less dissolution ability than distinct gilsonite made The color of grahamite is blacker than gilsonite and its fracture surfaces are conchoidal. It is believed that grahamite is the result of gilsonite transformation.
Grahamite is sometimes seen in pure form and sometimes in impure form and mixed with 50% of other minerals. This mineral was discovered for the first time in 1860 in Ritchie County, West Virginia, USA. There are mines in other American states, including Colorado and Oklahoma, and other countries such as Cuba and Trinidad, but its production has been stopped for years.
Glance Pitch
Another name of this mineral is Manjak and it is one of the other minerals of the asphaltite family. The properties of glans pitch are intermediate between gilsonite and grahamite, meaning that its specific gravity is higher than gilsonite and lower than grahamite.
And its melting point is higher than gilsonite and lower than grahamite. This mineral was first discovered in Barbados, but later it was also discovered in Utah, Cuba, Argentina, Colombia, Mexico and Russia. The uses of gloss screw are in the manufacture of polished paint, paints, thermoplastics, etc.
Uintahite
Another name is Gilsonite, from the Asphaltite family, which is used locally in the state of Utah.
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