Chlorine removal issue in the bismuth oxide method using zinc sulfate solution

The effect is good; it can be regenerated. In China, the main methods used are alkaline washing combined with ion exchange, or alkaline washing combined with copper slag

The effect is good; it can be regenerated, as stated in the literature. But it’s strange that there aren’t many factories in China using this method, and there is very little relevant literature available. Have you done this before?

High-efficiency chlorination removal technology and device using ion exchange – An improvement on existing fixed-bed ion exchange technology and devices for chlorination removal 1. Technical background: Our company developed the ion exchange technology for chlorination removal in the zinc electrolysis industry in 2008, and it has since been put into industrial use; it has been applied in more than 50 enterprises across nearly ten provinces, municipalities, and autonomous regions. 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 resin beds during operation, as well as the kinetics of ion exchange processes involving adsorption and desorption by resins. 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 is increased 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) Thanks to the technological advancements mentioned above, equipment investment and unit processing costs 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 progress and energy savings in related industries. . Companies interested in this technology can search for “Chengji Technology” or “Jishou Chengji Technology Development Co., Ltd.” on Baidu.

I suggest you buy some bismuth oxide to give it a try. Pilot tests were conducted, but the results were not good.