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Source: Sina News
"Ionic rare earth ore is an important strategic resource in China. The development of clean production and high quality utilization technology of rare earth has important resources, environment and energy significance. This is all kinds of rare earth materials we have isolated, and some of them are of high value." Sun Xiaoqi, a researcher at the Xiamen Institute of rare earth materials at the CAS Hercynian Institute, said.
Rare earth is recognized by the world as an indispensable strategic resource for the development of high technology, National Defense advanced technology and the transformation of traditional industries. It is a treasure house of new materials in twenty-first Century. There are more than 70% of the heavy rare earth resources in the South China's ionic ore, but the current utilization situation is not very optimistic, and the separation process will cause problems such as vegetation destruction, soil erosion and environmental pollution.
For the study of this "super industrial monosodium glutamate", the team led by Sun Xiaoqi, a researcher at the Rare Earth Institute in Xiamen, is full of passion and pursuit. They face the need of R & D of clean and efficient ionic rare earth ore metallurgy integration process, and have made significant breakthroughs in the R & D field of rare earth efficient and clean separation technology. Liu Yandong, vice premier of the State Council, has highly praised this technology. At present, the team carried out the industrial test is being carried out smoothly, and to establish a strategic partnership with the Ganzhou municipal government, Ganzhou and Xiamen tungsten, rare earth, Qiandong rare earth to carry out substantive cooperation.
China is the first country in the world to produce rare earths. The research of rare earth separation chemistry and engineering has made great progress, but the rare earth separation industry still has serious problems such as environmental pollution and low utilization rate of resources. With the improvement of China's environmental protection standards and the rapid growth of high - purity re - rare earth demand at home and abroad, the problems of ionic rare earth separation technology need to be solved urgently. However, at present, it is difficult for enterprises to optimize their defects by adjusting process parameters, and the key and scientific issue of developing clean and efficient rare earth separation process is to develop new extraction system and separation process.
Zhang Yun, a deputy director of Xiamen Rare Earth Research Institute, said: "it's our duty to face the national needs, the common problems in the industry and solve the technical problems of enterprises." He said that the Sun Xiaoqi team carried out a lot of applied basic research for this purpose, and strive to develop high-performance rare earth separation system, so as to solve the key scientific problems in the process of transition from basic research to industrialization.
The researchers used the world advanced technology, to carry out systematic research on efficient and clean separation of rare earth elements involved in the technology development process of the solution of coordination chemistry, extraction agent design, thermodynamics, kinetics of extraction, extraction, separation and extraction mechanism of materials and other basic scientific problems, has made important achievements stage.
At the same time, they also cooperate with the large state-owned rare earth group to apply the R & D technology to industrial test. The ionic liquid saponification technology of the team and Xiamen tungsten Limited by Share Ltd R & D, based on the mechanism of ion association, can effectively avoid the above problems from the extraction mechanism. The existing industrial tests show that the low cost extractant is completely domestically produced without phosphorus, and the total ammonia nitrogen in the straight row wastewater is significantly lower than the standard requirement for the discharge of rare earth industrial pollutants.
Xiamen rare earth and Ganzhou rare earth group cooperation, to carry out research on recovery of rare earth metals and radioactive elements in the waste residue, found that the rare earth content in slag as the original content of more than 130 times, but the recovery is very challenging valence rare earth elements and radioactive elements. According to the characteristics of radioactive wastes, the research team used new extraction system, the industrial test smoothly, residue after acid dissolution and extraction, acid leaching rare earth recovery rate of more than 92%, recovery of radioactive element thorium was more than 90%; the purity of more than 99% products isolated from lutetium. In the waste water, the content of the residual thorium has reached the emission standard of the rare earth industrial pollutants.