In 1925, German chemist Watt Luo Dake, Ed Teke, O. Beckham discovered rhenium, and Rhine named it rhenium.
The earth's crust contains about 1 × 10 -7 %. The melting point of yttrium is 318 ° C, second only to carbon and tungsten; the density is 21 g / cm 3 , second only to platinum and ruthenium and osmium . Since helium and molybdenum atomic radii and ionic radii (Re 4+ =0.056 nm, Mo4+=0.068 nm) are very close, helium often replaces molybdenum and enters the molybdenite crystal lattice. The study also found that some of the strontium is still present in the gaps or defects between the molybdenum ore crystals. The sulfides of antimony are mainly Re 2 S 7 and ReS 2 .
Natural state defects have not yet been discovered, and bismuth is rarely present as a major mineral component. Most of the natural cockroaches are parasitic among other minerals. Molybdenite is the only important host mineral and is the main source of cockroaches. The ruthenium present in other minerals is only traced and has no industrial recycling value.
Earthworms are often enriched in 3R molybdenum ore, while 2H molybdenite is lower in content. The proportion of 3R-type molybdenum ore in porphyry copper -molybdenum ore is often large, and the strontium content is also high (several hundred to 18 × 10 -4 or more); the porphyry molybdenum ore contains less 3R-type molybdenite, containing strontium Also lower (1 ~ 10) × 10 -5 . According to J.M. Blossom, 99% of the world's strontium production comes from low-grade medium-low temperature hydrothermal porphyry copper-molybdenum deposits. The world's resources are listed in the table below.
China's reserves are also large, mainly distributed in Shaanxi, Henan, Hunan, Liaoning and other provinces, especially in Shaanxi (about 60% to 70% of proven reserves). In several large molybdenum, rhenium reserves have been used, but in molybdenite content is very low (JINDUICHENG: 17 ~ 20g / t, Yangjiazhangzi and Luan were 20g / about t). Mines with high yttrium include Hunan Baoshan Copper Mine (above 600g/t) and Shaanxi Huanglongpu Molybdenum Mine (above 300g/t).
At present, the world's annual output is about 10~50t. The main manufacturers include S.W. Sataco Chemical Company, Duval Company, Kenny Cote Copper Company, Molybdenum Company, Smelting and Recycling Refractory Metal Company. In addition to the five US companies, Chile, Germany, Sweden and Russia also produce antimony products.
铼 has entered the molybdenum ore crystal. During flotation, 铼 辉 辉 molybdenum ore entered the molybdenum concentrate, and conventional beneficiation could not be separated by molybdenum-niobium. The recovery of hydrazine depends on the separation and extraction of the molybdenum concentrate deep processing. The separation process of bismuth varies with the decomposition process of molybdenum concentrate.
Table World Resources (t)
Country and region | Reserve | Prospective reserves | |
North America | United States | 1000 | 5000 |
Canada | 450 | 1700 | |
Total | 1450 | 6700 | |
South America | Intellectual | 1300 | 2800 |
Secret | 200 | 600 | |
Total | 1500 | 3400 | |
Europe | Former Soviet Union | 250 | 850 |
Other | 100 | 400 | |
World total | 3300 | 11400 | |
According to JWBlossom 1984 information
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When the molybdenum ore is decomposed by the oxidative roasting method, the antimony sulfide is also oxidized to Re 2 O 7 . Re 2 O 7 is fusible (melting point 297 ° C), easy to sublimate (2500 ° C begins to sublimate, Re 2 O 7 vapor pressure reaches 0.1 MPa at 360 ° C). Therefore, under oxidative roasting conditions, Re 2 O 7 almost completely entered the soot. A schematic diagram of the process of extracting antimony from soot, as shown below.
Figure roasting method
When the oxygen calcination process wets molybdenum ore, the ruthenium is converted into ReO 4 - ions into the night.
The solution containing molybdenum and niobium (and impurities) can be purified by solvent extraction or ion exchange, and purified and processed to produce ammonium perrhenate NH 4 ReO 4 product. The molybdenum in the solution can be produced as ammonium paramolybdate. This part of the process will be introduced in the fourth chapter of the ammonium molybdate wet decomposition process.
铼 is recycled as an important companion element in the deep processing of molybdenum concentrate.Pipe Fitting Plastic Injection Mold,Hot Runner Injection Mold,Plastic Mold For Paver,Plastic Injection Molds
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