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rare earth elements for lanthanide 15 elements with sc and y for a total of 17 elements, according to the difference of the physical and chemical properties and similarity, which can be divided into three groups: light rare earth group (la ~ promethium), in the rare earth group (sm ~ dy) and heavy r...
2019-07-31 | industry:
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the difference in platinum, palladium, and rhodium content and the corresponding price fluctuations are becoming an important factor in the purchase and recovery of three-way catalytic converters. in 2010, the total global sales of platinum, palladium and rhodium were 245 tons, 299 tons and 27.2 ton...
2021-08-18 | industry:
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in nature, uranium is usually found in the form of u-238 (99.2739 – 99.2752%), u-235 (0.7198 – 0.7202%), and a small part of it is found in the form of u-234 (0.0050 – 0.0059%). a major feature of u-235 is the isotope that can naturally fission (can maintain a chain reaction of nuclear fission). u-2...
2021-08-18 | industry:
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1. apparatus and working conditionsin this experiment, a shine x-ray diffractometer was used for testing. the kα of the cu target was the radiation source, and λ = 0.15418 nm.the sample test conditions are as follows:instrument model浪声映shinepower/w30test modeshaketesting time5s*120 timeslight pipecu...
2021-08-18 | industry:
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