This system consists of a high-pressure centrifugal fan, a new pulse bag filter, a material bucket, a magnetic separator, a connecting pipe, an electrical control box, etc. It has the characteristics of high fan efficiency, low noise, strong gas processing ability, and good purification effect. It can meet the cyclic use of flux in the welding of spiral steel pipes and H-beams, improve production efficiency, and is a flux recovery device. This device has been widely used in five major petroleum steel pipe factories, including Baoji Petroleum, and has received recognition and praise from users. It has also been exported to countries such as the United States, Indonesia, and the Philippines along with the steel pipe unit.