EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

Considerable amounts of slag and dust are produced in integrated – iron ore based – steelmaking as well as in EAF – scrap based – steelmaking. These by-products still contain considerable amounts of metals in metallic and oxide form and are nowadays only partly processed and recycled, the rest has to be landfilled. Typical solutions are internal recycling via the sinter plant and the blast...

In Germany, 43 million tons of steel were produced in 2015, together with about 14 million tons of iron and steel slag as a by-product; about 2 million tons of which are slag from the electric arc furnace. This slag is predominantly used in road construction and earthworks in Germany; because of its significantly superior physical properties it partly substitutes natural rocks in these fields....

More than 40 Million tons of steel were produced in Germany in 2015. Therefore the total amount of iron and steel slags is about 13 Million tons every year. The black slag from electric steel making (EAF-slag: approx. 2 Million tons every year in Germany) produced during the scrap melting process in the electric arc furnace can be used in the construction of roads and in other high-grade...

By mass, slag is the largest residue in iron and steelmaking. Due to excellent properties as a construction material slag is rising in popularity as a resource. Before slag can be used there are some restrictions that must be fulfilled of which the leaching of chromium is one. For slag to be considered inert material the leaching limit for chromium is at 0.5 mg/kg. The leaching of slag is...

An increased environmental consciousness, more stringent environmental regulations and a raise of raw material costs have characterized the last few years. All these factors affect the industrial chain management and in the case of the steel industry lead to an intensification of the effort to find solutions allowing increasing waste and by-product reuse. The paper presents part of the work...

Although its chemistry rich in valuable raw materials: carbon content up to 60% and iron content of up to 30 %, blast furnace sludge cannot be recycled into the sintering process, because of its Zn content which is detrimental for Blast Furnace operation. Without an economically viable solution to the problem, millions of tonnes of sludge goes to landfill, creating costs for steelmakers who...