求翻译：针对该工艺的上述缺点，国内鲁北化工总厂、四川大学、南京化工大学、昆明理工大学和贵州大学等多家单位[3-9]围绕磷石膏热分解技术方面进行了很多探索研究，申请了多项专利。是什么意思？

Around the phosphogypsum thermal decomposition technology for a number of units of the above-mentioned disadvantages of the process, the domestic LuBei Chemical Plant, Sichuan University, Nanjing University of Chemical Technology, Kunming University of Science and Guizhou University [3-9] were a lot

In the process of the above disadvantages, the domestic chemical factory, North Korea, Sichuan university, 4 University of Chemical Technology, Nanjing, Kunming University of Science and Technology and Guizhou University, and many family units [ 3- 9] around phosphor gypsum thermal decomposition tec

正在翻译，请等待...

For these shortcomings in the process, domestic lubei chemical industry plant, Sichuan University, Kunming, Nanjing University of chemical technology, Polytechnic University and Guizhou University and a number of units [3-9] around thermal decomposition of phosphogypsum technology has done a lot of

In view of this craft above shortcoming, domestic Lubei Chemical industry Main plant, the Sichuan University, Nanjing Chemical industry University, Kunming University of Science and Technology and Guizhou University and so on many unit (3-9) encompassment phosphorus gypsum thermal decomposition tech