To turn waste into treasure and achieve "zero emission" of steel slag, grinding is one of the essential processes. At present, the domestic steel slag powder preparation equipment is mainly small ball mills with very low energy utilization rate. There has been no ideal steel slag crushing and grinding equipment. The main problems of traditional steel slag crushing and grinding equipment and processes are: first, because the steel slag contains steel blocks, the traditional crushing and grinding equipment has the problem of "steel jam", which cannot guarantee the continuous normal operation of the equipment. In serious cases, it will damage the crushing mill and the production efficiency is low; second, the traditional crushing equipment is difficult to crush the steel slag to the need. The particle size of the steel will fully dissociate the "steel" and "slag". The large particle size of the tailings will result in high energy consumption for grinding, high iron content in the tailings, and waste of resources, limiting the scope of use of the tailings and reducing the tailings. The value of three; the traditional steel slag crushing powder adopts three-stage or even four-stage closed circuit process, which has large circulation volume, complicated process, large investment in infrastructure, high energy consumption, fast consumption of wearing parts, and high operating cost.
Actively developing and applying advanced and effective processing technologies and new technologies for resource utilization to increase its utilization rate and added value is one of the important topics for steel companies to develop circular economy and achieve sustainable development.
Process technology design and process
The steel slag separation process can be divided into mechanical crushing-magnetic separation and self-grinding-magnetic separation according to the crushing principle. ①Mechanical crushing-magnetic separation process steel slag mechanical crushing-magnetic separation process, it is the most basic process for recycling slag steel. The crusher used in the process includes cone crusher, impact crusher and double roller crusher. Magnetic separators include hanging magnetic separators and electromagnet magnetic separators. Sieves include single-layer vibrating screens and double-layer vibrating screens. When sorting steel slag, use belt conveyors and hoists to connect these kinds of equipment according to different requirements to form two-break three-select-two-screen, one-break two-stage composite magnetic separator, two-break-three-select one screen, etc. ②The steel slag self-grinding and sorting process uses steel slag to collide with each other in the rotating self-grinding machine to break. The steel slag is screened, magnetically separated, and screened before entering the self-grinding machine. Steel slag with a particle size smaller than the discharge aperture around the self-grinding machine leaks out on its own.
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