What methods can be used to remove fluorine and chlorine from zinc oxide powder?

The ion exchange method for chlorine removal technology and equipment developed by us have been applied in over 50 zinc electrolysis enterprises. A second-generation technology with better performance has now been developed; the cost of chlorine removal per ton of zinc is around 100 yuan. The basic details are as follows: High-efficiency ion exchange method for chlorine removal technology and equipment – An improvement on the existing fixed-bed ion exchange method for chlorine removal. Technology developer: Jishou Chengji Technology Development Co., Ltd. Address: Outside the north gate of Jishou University, Jishou City, Hunan Province. Telephone (fax): 0743-8563981, 13974368248. Email: zouxy68@163.com. Website: http://www.smtf.net.cn/ 1. Technical background: Our company successfully developed and put into industrial use the ion exchange method for chlorine removal in the zinc electrolysis industry in 2008; to date, this technology has been applied in over 50 enterprises across nearly ten provinces and municipalities. The ion exchange method for chlorine removal, developed in 2008, uses fixed-bed equipment; its advantages are stable operation, ease of control, and mature technology, while its disadvantages are low efficiency of the process equipment, high consumption of ion exchange resin, and large amounts of wastewater generated. To address the shortcomings of existing technologies, our company has conducted extensive experimental research on improvements. We have systematically studied various factors that affect the working exchange capacity of resins, the stability of resin beds under different process parameters, the distribution patterns of ions within the resin beds during operation, as well as the kinetics of ion exchange and desorption processes. On this basis, we have developed an efficient ion exchange process and equipment for chlorine removal. 2 Advantages of new technology: (1) The developed ion exchange method for efficient chlorine removal is technically feasible, with stable economic and technical indicators ； (2) High-efficiency dechlorination processes and equipment are employed; compared with existing technologies, the working adsorption capacity of ion exchange resins increases by more than 30% ； (3) The processing efficiency of the equipment has been significantly improved. Under the same liquid conditions, compared with existing technologies, the efficiency of ion exchange in adsorbing chloride ions is increased by about two times, while the efficiency throughout the entire operation cycle is increased by more than one time ； (4) Compared with existing technologies, the ion exchange method reduces the wastewater volume generated during the chlorination removal process by about half, and cuts the overall cost of chlorination removal by one-third ； (5) Due to the technological advancements mentioned above, equipment investment and the cost per unit of treatment for new technologies have been significantly reduced, and wastewater generation has also decreased markedly. This new technology has been applied in several zinc electrolysis plants. Some of the plants that initially used fixed-bed chlorination removal technologies and equipment are gradually upgrading to more efficient ones, which will eventually replace the existing fixed-bed ion exchange methods for chlorination removal. This will contribute to technological advancement and energy savings in related industries.