High-efficiency Recovery of Iron Particles from Blast Furnace Slag in Foundry Industry

In the casting production process, the treatment of blast furnace slag has always been a key link in resource recycling and cost control. The pure iron particles contained therein, if effectively separated and recycled, can not only reduce resource waste but also provide high-quality raw materials for downstream cast iron materials, achieving a win-win situation for economic and environmental benefits. However, the traditional path of iron particle recovery has often been constrained by technological bottlenecks, with the recovery rate difficult to increase. It was not until ZK broke the deadlock with innovative technology that the industry moved towards a more efficient and greener resource recycling model.

The predicament of traditional craftsmanship: low recycling rate and frequent material blockage

In the past, after the blast furnace slag was screened using a vibrating screen to remove large pieces of iron materials, it needed to undergo coarse crushing, fine crushing and screening to obtain materials ranging from 20 to 50 mm. These materials usually entered a hammer crusher for further processing, with the expectation of separating iron particles from steel slag. However, when hammer crushing was used to process such mixed materials that are both hard and tough, problems such as blockage, rapid equipment wear, and over-crushing often occurred, resulting in the iron particle recovery rate remaining at around 60% for a long time. A large amount of usable iron particles were lost along with the slag, causing resource waste and increasing the subsequent disposal costs.

Technological Innovation: The Rod Mill Process Opens a New Era of Efficient Separation

To address this industry challenge, ZK conducted a thorough analysis of the material characteristics and the crushing mechanism. It was the first to propose a core process improvement plan that replaces the traditional hammer crusher with a rod mill. After introducing materials ranging from 20 to 50 mm into the rod mill, it uses steel rods as the grinding medium. Through rolling friction and mild impact, it achieves efficient stripping and selective crushing of the steel slag on the surface of iron particles.

This innovation brings about significant advantages.

• Significant increase in recovery rate: Iron particles are better retained in the rod mill and effectively separated from the slag, resulting in a stable recovery rate of over 90%. This represents a qualitative leap in the value of resource recovery.

• Eliminate the problem of material blockage: The operation mode of the rod mill is more suitable for the characteristics of the mixed materials. The smooth processing process has completely solved the previous frequent problems of material blockage, ensuring continuous and stable production.

• Superior iron particle quality: The surface cleanliness and purity of the iron particles after separation are high, the shape is well maintained, and they better meet the production requirements for subsequent cast iron materials.

ZK: Empowering Solid Waste Recycling with Technology

As a professional institution dedicated to solid waste disposal and resource utilization, ZK is well aware that "waste is misplaced resources". This successful improvement in the recovery process of blast furnace slag and iron particles is a vivid example of our use of technological innovation to promote energy conservation and emission reduction, as well as cost reduction and efficiency improvement in industrial enterprises. We not only provide advanced equipment, but also offer targeted process solutions, helping enterprises convert production by-products into valuable reusable resources, and achieving the closed loop of the circular economy chain.