With the independent intellectual property rights of the diasporic Bayer process, sintering process carbon production of sand alumina decomposition technology, the overall technology has reached the international advanced level. Its research results and technologies have been promoted and applied throughout the China Aluminum Group.
"Successive carbon production of sand alumina" through the study of key technologies such as cooling of semen, seed addition, adjustment of aeration rate of decomposition process, decomposition time, product cyclone grading and other key technologies to develop "semen cooling - control decomposition gradient - add cycle "Continuous carbon of seed crystal" is a new process for the production of sand-like alumina. The process is simple, the process is stable, and the decomposition process is easy to control. It is easy to realize full automation, and it can stably obtain qualified sand-like alumina products.
The "Bayer method of sand alumina" through the systematic study of the influencing factors of the seed, successfully developed the "high temperature agglomeration - intermediate cooling - low temperature growth - medium solid content" production process route, in a dicalite Sand alumina can be stably produced in the raw material alumina Bayer process. At the same time, it has developed a set of regulation technologies for product particle size, strength, and stability and balance of system granularity. The technical indexes of the Bayer process and the alumina products obtained in the semi-industrial test and industrial test have all reached the The target of research indicates that the quality of alumina produced by Bayer process in China's diaspore mine has been upgraded to a new level of sand-like alumina.
Through the study of "Sand Alumina Decomposition Technology", the alumina index of the product has been significantly improved, significantly reducing the damage during the roasting of the gaseous suspension furnace and improving the performance of electrolysis. The continuous carbon fraction and the Bayer process have reliability. And advanced, and the overall economic benefits are better. This technology can realize the production of sand-like alumina without the need to greatly transform the existing Bayer-Sinter mixing joint method and the Bayer method alumina plant seed production system in China, and has a broad application prospect. It has been successfully applied in China Aluminum Shanxi Branch.
Silicon nitride can also be applied to solar cells. After the silicon nitride film is plated by PECVD, not only can it be used as an anti-reflection film to reduce the reflection of incident light, but also, in the deposition process of the silicon nitride film, hydrogen atoms of the reaction product enter the silicon nitride film and the silicon wafer. It acts as a passivation defect. Here, the silicon nitride nitrogen atomic number ratio is not strictly 4:3, but varies within a certain range depending on the process conditions, and the physical properties of the film corresponding to different atomic ratios are different.
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