Iron oxide can be regenerated for 2-3 times. After being pulled out of the desulfurization tower, it can be regenerated in a day or so in the dry place. The finished particles screened by sieve can be filled into the desulfurization tower. If you want to use it only once, I suggest you contact the iron oxide manufacturer to see if it can be recycled. I have no experience in this field. If you can, it's better to use wet sodium carbonate for desulfurization if the gas volume is large, so no waste will be generated, and some economic benefits can be created by making sulfur.