The individual settlement of a single ore in a broad medium space is called free settlement, and the settlement of individual ore particles in the group is called interference settlement. In the process of free sedimentation, the ore particles are only affected by their own gravity, medium buoyancy and resistance and are not affected by other factors. In the process of interference sedimentation, in addition to its own gravity, medium buoyancy and resistance, individual ore particles will also be affected by friction, collision and suspension of other ore particles, thus changing the sedimentation velocity and movement of individual ore particles. Track. It can be seen that the interference settlement process is much more complicated than the free settlement. All settlements in the re-election practice are interference settlement, but when the distance between the particles in the grain group is large, that is, the volume concentration ( the ratio of the total volume occupied by the ore particles to the total volume of the suspension ) is small ( generally less than 3). %) , the interference between the ore particles becomes very weak, which can be regarded as free sedimentation.
In free settling, the sedimentation velocity of the ore particles is related to the density, particle size and shape of the particles. When settled in the same medium, particles of different density, particle size and shape may have the same settling velocity at specific conditions, and these different particles having the same settling velocity are called equal-falling particles. Obviously, there are small particles of small density ( having a particle size of d 1 ) and small particles of large density ( set to d 2 ) , and the ratio of d 1 to d 2 is called an equal reduction ratio.Benzene, an organic compound, is the simplest aromatic hydrocarbon with a chemical formula of C6H6. At room temperature, it is a sweet, flammable, colorless and transparent liquid with carcinogenic toxicity and a strong aromatic odor. It is insoluble in water, easily soluble in organic solvents, and can also be used as an organic solvent itself. The ring system of benzene is called benzene ring, and the structure after removing a hydrogen atom from the benzene ring is called phenyl, which is represented by Ph, so the chemical formula of benzene can also be written as PhH. Benzene is a basic petrochemical raw material, and its output and production technology are one of the symbols of a country's petrochemical development level.
On October 27, 2017, the list of carcinogens published by the World Health Organization's International Agency for Research on Cancer was preliminarily sorted out for reference, and benzene was included in the list of Class I carcinogens.
Foreign name: Benzene, benzol, benzeen
Alias: Rest oil
Chemical formula: C6H6
Molecular weight: 78.11
CAS login number: 71-43-2
EINECS accession number: 200-753-7
Melting point: 5.5℃
Boiling point: 80.1℃
Water soluble: insoluble
Density: 0.88 g/cm³
Flash point: -11℃
Application: Used as spices, dyes, plastics, medicines, explosives, rubber, etc.
Security description: S36/37; S45; S53
Hazard description: R11; R36/38; R45; R46; R48/23/24/25; R65
UN Dangerous Goods Number: 1114/1115
The benzene ring is the structure of the benzene molecule. It is a plane regular hexagon, each vertex is a carbon atom, and each carbon atom is combined with a hydrogen atom. The carbon-carbon bond in the benzene ring is a unique bond between single and double bonds, with a bond angle of 120° and a bond length of 1.40Å
Benzene Series Intermediates,2 4 6-Trimethylbenzaldeliyde,4-Iodo-3-Nitrobenzoic Acid Methyl Ester,4-Iodo-3-Nitrobenzoic Acid
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