Why is the addition larger than the element deficit?

The additive contains carrier metal and may lose some target element. Its retained mass also increases the final bath mass.

Can I lower an element concentration here?

No. This model only raises one element. Dilution or removal needs a different material balance.

It is the fraction of the target element in the addition that remains in the metal bath, based on matched operating records.

No. It is a mass-balance estimate. Verify mixing, furnace capacity, other elements and the final sampled chemistry.

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Estimate the addition needed to raise one bath element using measured chemistry, additive assay and documented element recovery.

Estimate the addition needed to raise one bath element using measured chemistry, additive assay and documented element recovery.

p = additive assay ÷ 100; r = element recovery ÷ 100; t = target content ÷ 100
Retained addition fraction = 1 − p × (1 − r)
Required addition = bath weight × (target content − initial content) ÷ 100 ÷ (p × r − t × retained addition fraction)
Retained element = required addition × p × r; lost element = required addition × p × (1 − r)
Final bath = initial bath + addition − lost element; final content = (initial element + retained element) ÷ final bath × 100

Initial Bath Weight: Measured liquid metal mass before the addition.
Initial Element Content: Current representative bath analysis for the target element.
Target Element Content: Approved target composition for this element.
Additive Element Assay: Target-element assay on the addition material certificate.
Expected Element Recovery: Documented recovery for the same addition and melting practice.

Best suited to lower element recovery requires more Addition, higher element recovery requires less addition.
Only enrichment of one element is modeled; dilution, reactions and changes in other elements require a separate balance. Confirm the final chemistry with representative sampling before accepting the heat.

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Why is the addition larger than the element deficit? The additive contains carrier metal and may lose some target element. Its retained mass also increases the final bath mass.
Can I lower an element concentration here? No. This model only raises one element. Dilution or removal needs a different material balance.
What does recovery mean? It is the fraction of the target element in the addition that remains in the metal bath, based on matched operating records.
Is the calculated chemistry a release result? No. It is a mass-balance estimate. Verify mixing, furnace capacity, other elements and the final sampled chemistry.

Last reviewed 2026-10-06.