Electrolytic Manganese Metal Flake 99.7%: Specifications and Market Guide

What Is Electrolytic Manganese Metal?

Electrolytic manganese metal (EMM) is high-purity manganese produced by electrolysis. Manganese ore is leached with sulfuric acid to form a manganese sulfate solution, which is purified and then electrolyzed; manganese deposits on the cathode as flakes, which are stripped, washed, dried, and packed. EMM typically assays 99.7% manganese or higher, far purer than ferromanganese alloys, and is the form of choice when iron and carbon must not be introduced with the manganese.

Typical Specifications

Parameter	Typical limit	Note
Manganese	99.7% min	Higher grades up to 99.9% available
Iron	0.05% max	Critical for aluminum alloys
Carbon	0.04% max	Controlled for steel use
Sulfur	0.05% max	Affects steel quality
Phosphorus	0.005% max	Tightly controlled
Selenium	As agreed	Process additive; limited in some uses

Flake size is commonly specified as a range such as 2-8 mm or by mesh, and moisture must be minimized for safe storage and accurate dosing.

Production Route

EMM production is energy-intensive: the electrowinning step consumes roughly 6,000-8,000 kWh per tonne. The process includes ore leaching, solution purification (removal of iron, silicon, and heavy metals), electrolysis in diaphragm or separator cells, and final processing. Production is concentrated in China, which supplies most of the world's EMM, with smaller output in South Africa and other regions. Power cost and ore quality therefore dominate the cost structure.

Applications

Aluminum alloys: manganese additions of 0.5-1.5% improve strength and corrosion resistance in 3000-series alloys.

Specialty steel: precise manganese additions without carbon or iron pickup, for example in high-Mn austenitic steels.

Chemicals: manganese sulfate and other manganese compounds for agriculture and industry.

Batteries: high-purity manganese for cathode precursors of lithium-manganese and NMC-type battery chemistries.

Welding consumables and non-ferrous alloys: controlled manganese additions.

How EMM Prices Are Formed

EMM prices are quoted per tonne, typically FOB Chinese ports or on a delivered basis. The main cost drivers are manganese ore prices, electricity, sulfuric acid, and production capacity utilization. Demand from steel, aluminum, and battery sectors moves the market, and published reference assessments track spot levels. Because prices are volatile, historical quotes should be treated as reference points, not current offers. Buyers should request fresh quotations with the grade basis, packing, and delivery terms clearly stated.

Buying Considerations

Confirm the manganese basis (99.7% or higher) and the impurity limits relevant to your application.

Specify flake size and packing: typically 1-tonne bags with inner plastic lining, or drums for sensitive uses.

Request a certificate of analysis per lot and arrange independent sampling for large contracts.

Check moisture content; wet flakes are inaccurate to dose and can corrode packaging.

For battery use, confirm selenium and heavy-metal limits and full traceability of the lot.

FAQ

1. What is the difference between EMM and ferromanganese?

Ferromanganese is an iron-manganese alloy used in bulk steelmaking, while EMM is nearly pure manganese metal. Use EMM when iron and carbon must be excluded, for example in aluminum alloys, high-purity steels, and battery materials.

2. Do I need 99.9% EMM instead of 99.7%?

For most steel and aluminum applications 99.7% is sufficient. Battery cathode precursors and certain chemical processes require 99.9% with tight impurity profiles. Specify the end use so the supplier can match the grade.

3. Why does EMM cost more than ferromanganese?

The electrowinning process consumes large amounts of electricity and requires pure feed solutions, and production is concentrated in a few regions. The purity premium is justified when the application demands clean manganese.

4. How is EMM quality verified on arrival?

Take representative samples, analyze manganese and key impurities by XRF or wet chemistry, and compare with the certificate of analysis. Keep sealed retained samples and follow the contractual claim procedure if there is a discrepancy.

5. Can EMM be stored long term?

EMM is stable in dry conditions but can oxidize slightly and pick up moisture in humid storage. Keep it in sealed, moisture-proof packing, store off the ground, and use first-in-first-out stock rotation.