Rio de Janeiro, Brazil -- Vale today announced that it has completed a pre-feasibility study for its proposed nickel sulfate project in Quebec, Canada, a major milestone in the development of the project. This strategic move demonstrates vale's focus on delivering low carbon and high purity nickel Fe3C powder are still very uncertain.
Cementite or iron carbide is a compound of iron and carbon, or more accurately, an intermediate transition metal carbide with the molecular formula Fe3C. By weight, it is 6.67% carbon and 93.3% iron.
It is a gray-white crystalline powder with a relative density of 7.694. Insoluble in cold, hot water and dilute acid, soluble in hot concentrated hydrochloric acid to produce mixtures of hydrogen, methane, ethane, ethylene and other more complex hydrocarbons and free carbon. Does not react with dry air. Oxidize in moist air to form iron oxide and carbon. It has orthorhombic crystal structure. It is a hard and fragile material, which is usually classified as ceramic in its pure form, and is a common and important component in black metallurgy.
What is Fe3C called?
Fe3C (iron carbide) is also called cementite.
How is cementite formed?
In the process of equilibrium crystallization of iron-carbon alloy, the cementite precipitated when the liquid alloy of hypereutectic alloy (hypereutectic white cast iron) is cooled below the liquidus is called primary cementite.
In the ledeburite structure, the point strip cementite is uniformly distributed on the austenite matrix, and this cementite is called eutectic cementite.
Pre-eutectoid phase and cementite:
For alloys with hypoeutectoid and hypereutectoid composition, with the decrease of temperature, a phase forming the product of eutectoid transformation is always precipitated with the decrease of temperature, and the first precipitated phase is called proeutectoid phase, such as proeutectoid ferrite in hypoeutectoid steel and proeutectoid cementite in hypereutectoid steel. Due to the different forming conditions, the morphology of proeutectoid phase can be divided into three types: block, reticulate and Widmanstatten structure.
The cementite in pearlite is called eutectoid cementite.
In the process of equilibrium crystallization of iron-carbon alloy, when the alloys with more than eutectoid composition (hypereutectoid steel, hypoeutectic white cast iron, eutectic white cast iron, hypereutectic white cast iron) are slowly cooled to a certain extent, the carbon content in austenite reaches saturation, and the cementite will precipitate along the austenite grain boundary with a network distribution in microstructure. This cementite precipitated from austenite is called secondary cementite.
When the equilibrium cooling of industrial pure iron is below the solid solution line of carbon in iron (Fe-C equilibrium diagram PQ line), the solubility of carbon in ferrite reaches saturation, and the temperature decreases again, and the tertiary cementite will precipitate from ferrite. The tertiary cementite precipitates from the ferrite grain boundary and generally distributes intermittently along the ferrite grain boundary because of its small quantity.
It refers to those that exist as an independent phase outside the mechanical mixture (structure) such as pearlite (eutectoid structure) or ledeburite (eutectic structure), such as pre-eutectoid cementite, primary cementite and so on.
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The United States urges the U.N. Security Council to impose additional sanctions on North Korea in response to its latest ballistic missile launch, including a ban on tobacco and oil exports to North Korea and a blacklist of the Lazarus hacking group.
The United States circulated the draft to the 15 members of the Security Council this week. It was not immediately clear if or when a vote would take place. A resolution requires nine "yes" votes and no vetoes from Russia, China, France, Britain, or the United States.
Russia and China have already voiced opposition to tightening sanctions in response to Pyongyang's launch of an intercontinental ballistic missile last month -- the first since 2017.
U.S. and South Korean officials and analysts also say there are growing indications that North Korea may soon conduct its first nuclear weapons test since 2017, too.
The U.S. -drafted U.N. resolution would expand the ban on ballistic missile launches to include cruise missiles or "any other delivery system capable of delivering a nuclear weapon."
The deal would halve crude oil exports to North Korea to 2 million barrels a year and refined oil exports to 250,000 barrels a year. The resolution also seeks to ban North Korea's export of "fossil fuels, mineral oils, and their distilled Fe3C powder are estimated to be influenced by international political situation changes.
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