Slag is a by-product of smelting (pyrometallurgical) ores and used metals. Broadly, it can be classified as ferrous (by-products of processing iron and steel), ferroalloy (by-product of ferroalloy production) or non-ferrous/base metals (by-products of recovering non-ferrous materials like copper, nickel, zinc and phosphorus).
from:https://en.wikipedia.org/wiki/Slag
The composition of ferrous slag is dominated by Ca and Si. Steel slag may contain significant Fe, whereas Mg and Al may be significant in Fe slag. Calcium-rich olivine-group silicates, melilite-group silicates that contain Al or Mg, Ca-rich glass, and oxides are the most commonly reported major phases in ferrous slag.
Storage
Slag and spent refractories are delivered, stacked together and stored until they are sent for recycling.
Crushing
The first step involves breaking the material up into rough chunks. Any contaminants – such as plastic, wood and large metal pieces – are removed by hand.
Grinding
The slag and spent refractories are fed through the mill (water is needed throughout this process). The metal is rolled flat and the brittle slag broken up.
Screening
The valuable metals are removed via a screen. They are then used by industrial businesses as a high quality raw material.
Dewatering
Complex technology is used to remove the water from the residual minerals which are then sent to the Lippe Plant’s landfill.
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