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Anonymous users2024-02-07Production of manganese-rich slag in blast furnaces.
1) Characteristics of manganese-rich slag in blast furnace smelting.
The process and main equipment of blast furnace smelting manganese-rich slag are basically the same as those of blast furnace smelting pig iron and ferromanganese, but the process operation has significant characteristics. The main ones are:
Among all the products produced in the blast furnace, the blast furnace manganese-rich slag smelting furnace has the lowest temperature. In principle, the furnace temperature is required to be controlled in the temperature range to ensure that iron and phosphorus are fully reduced, manganese is not reduced or a small amount is reduced, and liquid slag iron can be effectively separated. Generally, it is 1250 1350, which is 100 150 lower than the pig iron blast furnace and 200 250 lower than the ferromanganese blast furnace
Among all blast furnace products, blast furnace manganese-rich slag smelting slag has the lowest alkalinity. No flux is added, natural alkalinity smelting, and the alkalinity is generally less than.
Blast furnace smelting of manganese-rich slag is generally operated with high load and low air temperature. The ore has low iron content, low wind temperature and high load;The ore has high iron content, high wind temperature and low load.
The thermal energy and chemical energy of manganese-rich slag gas in blast furnace smelting are well utilized.
Manganese-rich slag smelting is a large slag smelting, the slag-iron ratio is as high as 3 5t t, the manganese content of manganese-rich slag is mainly determined by the manganese and iron content of the ore, and the manganese ** rate can reach 85% 90%.
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Anonymous users2024-02-06The low grade of uranium in the raw ore, the high purity of the final product, and the radioactivity have become the three significant characteristics of the uranium chemical smelting process.
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Anonymous users2024-02-05The characteristics of uranium disturbance in the midstream mountain mines are as followsSlow grinding mountain ().
a.Low taste.
b.The ore body is scattered.
c.Small scale.
d.All of the above.
Correct answer: d
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Anonymous users2024-02-04The gas diffusion method is to first convert the yellowcake into uranium hexafluoride gas, uranium-235
The molecular gas is lighter than the uranium-238 molecular gas and can pass through the diffusion membrane more quickly, thus achieving the separation effect. With each passing through the diffusion membrane, the concentration ratio of uranium-235 to uranium-238 increases slightly, so a multi-stage diffusion membrane is required, and the gas that has passed through the diffusion membrane is then pumped to the next stage, while the gas remaining in the diffusion membrane is returned to the lower stage for recirculation. To reach the reactor of a nuclear power plant.
The use of uranium-235 requirements, abundance.
Level 1000 or higher is required. Creation of the first atomic bomb.
The nuclear materials used are made in this way. The disadvantages of the gas diffusion method are the small separation coefficient, the large size of the plant, and the high power consumption and cost. It has been 64 years since the gas diffusion technology was marketed, and the factories using this technology have been withdrawn one after another.
Gas centrifugation.
Gas centrifugation – In this type of process, uranium hexafluoride gas is compressed through a series of high-speed spinning cylinders, or centrifuges.
Uranium-238 isotopes.
Heavy molecular gases are more likely to be enriched near the walls of the cylinder than uranium-235 light molecular gases. The gases enriched in the paraxial axis are exported and transported to another centrifuge for further separation. As the gas passes through a series of centrifuges, its uranium-235 isotope molecules are gradually enriched.
Gas centrifugation requires much less electrical energy than gas diffusion and is therefore used in most new enrichment plants.
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