The most common distinction between rare-earth elements is made by atomic numbers; those with low atomic numbers are referred to as light rare-earth elements (LREE), those with high atomic numbers are the heavy rare-earth elements (HREE), and those that fall in between are typically referred to as the middle rare-earth elements (MREE). [28]

2024年5月15日 · Heavy rare earth metals are defined by their higher atomic weights relative to light rare earths. They are less common, and some elements within the group are facing shortages as demand outpaces...

Rare Earth Elements (REE) are becoming increasingly important in electronic devices used in the defense, alternative energy, and communications industries. Minable deposits of REEs are found in only a few locations.

Rare earth elements occur in many minerals but typically in concentrations too low to be refined in an economical manner; the concentration of REEs in the Earth's crust is estimated to be between 150 to 220 parts per million, which is higher than the concentration of other metals mined for industrial use, such as Cu or Zn.

2017年2月21日 · Heavy rare earth elements (HREE) are dominantly mined from the weathering crusts of granites in South China. Although weathering processes occur globally, no economic...

Heavy rare earth metals are defined by their higher atomic weights relative to light rare earths. They are less common, and some elements within the group are facing shortages as demand outpaces supply. That typically makes them more valuable than light rare earths, though they also have smaller markets.

2019年7月1日 · Monazite is an important REE ore and most monazite ore deposits that are economically viable REE resources. Monazite includes cerium, and associated light REE and heavy REE such as Tb, Dy and Gd tend to be rarer, smaller, and less concentrated. In India, monazite is the principal source of light REE.

Rare-earth elements (REEs) are used in the components of many devices used daily in our modern society, such as: the screens of smart phones, computers, and flat panel televisions; the motors of computer drives; batteries of hybrid and electric cars; and new generation light bulbs.

2017年2月23日 · 稀土元素是现代工业的“维生素”，广泛应用于国防以及新能源技术中，而该类元素中的重稀土更是21世纪重要的战略资源，国际市场对这一矿产品的需求与日剧增。 全球约98%的重稀土资源来源于我国南岭地区花岗岩风化壳型稀土矿床，其稀土元素主要以离子态吸附在风化壳中的粘土矿物上，离子吸附过程一直被看作重稀土元素富集成矿的关键因素。...

2012年9月19日 · The rare earth elements are often described as being a 'light-group rare earth element' (LREE) or 'heavy-group rare earth element' (HREE). The definition of a LREE and HREE is based on the electron configuration of each rare-earth element. The LREE are defined as lanthanum, atomic number 57 through gadolinium, atomic number 64.