recycling steel slag: recovery of materials

Lecture by Edwin Hauwert and Diederik Fierig

Steel slag is a by-product of steel production. It is created when hot metal is converted into steel. The solidified steel slag is a stony material (similar to what you get from some quarries).

There are different types of slag. Blast furnace slag, the slag formed in the iron-making process, is used as a raw material in the cement industry. And steel slag is used worldwide as a building material for roads, noise barriers and dike bodies. Insufficiently covered steel slag can come into contact with water. This can have negative effects on the environment, but also on people's health. When applied, people in the vicinity may experience complaints such as nosebleeds, burns and skin irritation. Partly in response to these signals, the government has imposed a partial ban and a permit requirement for the application of steel slag.

Given this situation, a process to recover various materials from these slag is of interest. The challenge is to turn the steel slag in North Holland into new products that will be generated circularly such as various metal compounds (V, Cr, Ti, Ni), calcium and magnesium compounds, silicon and aluminium oxides, iron and phosphorus compounds. SLAG B.V. is currently marketing a process to recover these materials from slag. Edwin Hauwert and Diederik Fierig will further explain the process and possibilities this evening.

Programme

Free admission

You pay for your own refreshments

Organisation

Kring Alkmaar in cooperation with Nood-West region