Scrap Metal Analysis Technologies for Identification, Sorting, and Safety

X-ray fluorescence (XRF) spectroscopy is a nondestructive analytical technique used to determine the elemental composition of materials. XRF analyzers measure the secondary X-rays emitted from a sample when it is irradiated by a primary X-ray source. Each element produces a characteristic set of fluorescent X-ray signals, enabling both qualitative identification and quantitative measurement.

In scrap recycling applications, XRF analyzers are used for alloy identification and sorting across a wide range of metals. The technique supports accurate grading of aluminum and magnesium alloys, as well as high-value alloy families such as stainless steel, nickel, cobalt, and titanium.

Laser induced breakdown spectroscopy (LIBS) is an analytical technique used to determine the chemical composition of materials using a focused laser. Handheld LIBS analyzers generate a small plasma on the surface of a sample, causing atoms and ions to emit characteristic wavelengths of light that can be used for elemental identification and measurement.

In scrap recycling applications, LIBS analyzers are used for sorting and identification of metals based on elemental composition, including light elements such as carbon. This capability supports analysis of low alloy steels and stainless steels, including differentiation of grades such as SS-316 and SS-316L.

Optical Emission Spectroscopy (OES) is an analytical technique used to determine the elemental composition of metals and alloys with high precision. OES instruments generate a controlled electrical spark on the sample surface, causing elements within the material to emit characteristic wavelengths of light that can be measured and quantified. 

In scrap recycling operations, OES is used when accurate measurement of carbon and other light elements is required for alloy verification, material certification, and quality control. OES supports analysis of carbon steels, stainless steels, cast irons, tool steels, and specialty alloys where elemental composition directly impacts material value and downstream processing.

OES is commonly used for:

• Incoming scrap verification
• Alloy grade confirmation
• Carbon and sulfur analysis
• Stainless steel and low alloy steel classification
• Melt chemistry control
• Final product certification

For recycling operations that require laboratory-grade elemental analysis, OES provides detailed compositional data to support material quality and process consistency.

Cross belt analysis using PGNAA (Prompt Gamma Neutron Activation Analysis) technology utilizing either Cf-252 or neutron generator (Pulsed Fast Thermal Neutron (PFTNA)) offers precise, real-time insights into the elemental composition of bulk materials. By using neutrons to penetrate deeply into dense and heterogeneous materials and measuring the emitted gamma rays, PGNAA provides representative, real-time compositional data beyond surface-level analysis. 

PGNAA is well suited for post-shredding bulk stream elemental analysis, scrap blending and stockpile management, and feedstock control prior to furnace charging. This capability helps improve process efficiency, optimize material value, and reduce processing costs by providing accurate, continuous data.

Radiation detection technologies are used to monitor materials for radioactive contamination. These systems include portal monitors for screening incoming raw materials and portable devices for field inspection.

In scrap recycling applications, radiation detection systems are used to screen incoming scrap and support identification of radioactive materials before they enter processing operations. Portal monitoring systems are typically installed at facility entry points to provide continuous screening of inbound materials.

Handheld and wearable radiation detection devices provide real time detection of gamma radiation and dose rate measurement to verify the presence of radioactive sources. Some devices also offer neutron detection capabilities and alarm thresholds, supporting assessment of whether detected radiation is naturally occurring or from artificial sources.