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Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling hot iron or steel billets in rolling or steel mills.
It looks like a hard brittle sand and is mainly composed of iron oxides, mostly ferric, and is bluish black in color.
Being produced during the reheating, conditioning and hot rolling operation for the production of steel articles, the mill scale initially adheres to the steel surface and protects it from atmospheric corrosion, provided no break occurs in this coating.
From the chemical and physical analysis performed on the scrap, and according to the European Environmental rules, the material has been classified as a SPECIAL NON DANGEROUS WASTE, listed in “GREEN LIST “.
In particular the Mill Scale can be classified as follows:
EINECS (EUROPEAN COMMISSION NO.): 266-007-8
WASTE CODE: 10 02 10
BASEL CODE: B 12 30
HS CODE: 2619.00
 

 
Physical Properties:

At a visual inspection, it appears as a bluish black powder, made of small particles and chips. Its physical state is solid and powdered.
 
Density (g/cm3)
Melting Point (°C)
Specific Gravity (g/cc)
Fermion Index
 
5.7
1369°
6.02
0.01
 
Chemical Properties:

Mill Scale has been classified has an UVCB Substance since it is made of a large number of constituents and its composition can sensibly vary according to the metallurgical plant, from where it is collected.


 
Basic chemical composition:
Fe
P
S
Al2O3
SiO2+CaO
Toluene Solubles
Ti
V
Cr
Mn
Co
Ni
Cu
Nb
Mo
Sn
 
70-71%
Max 0.06%
Max 0.10%
Max < 1%
Max 1.5%
Max 0.5%
<0.05%
<0.05%
0.72%
0.59%
<0.05%
0.34%
0.11%
<0.05%
0.08%
<0.05%


The iron detected in the material is present in different chemical forms, and is composed by high-purity iron oxidized such as:
Magnetite, Fe3O4, of characteristic blue-gray "steely" color
An extremely thin outer film of Hematite, Fe2O3.
The inner portion of the magnetite contains fine metal grains and sometimes, residual Ferrous oxide as FeO, typically black colored.
The hard blue-black scales also contain valuable alloy materials such as wolfram, vanadium and molybdenum.

It is stable and insoluble in water and alkalis and soluble in most strong acids.

In the past the mill scales were just piled on a heap but with the development of new technologies the material can be recovered in different processes and recycling plant, such as:
Metal Industry or recovery (R4) in the chemical industry with (R5)
Pig Iron Foundry (R4)
Cement Industry for the production of counterweights or as an additive (R5)

The material is reprocessed and screened in order to free it from dirt, nonferrous metals, or foreign material of any kind.
The material will be loaded loose in 20’Upgrade container and delivered in strict compliance with the European laws regulating the shipment of wastes.

Photogallery

Mill Scale
Mill Scale
Mill Scale
Mill Scale

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