How C12 Fatty Amines Are Evaluated in Quartz Flotation

In reverse flotation of magnesite ore, the aim can be to carry quartz into the froth while retaining the valuable magnesite. A collector helps selected mineral particles attach to air bubbles. Two collectors can share the same 12-carbon tail and still behave differently in the same ore. sciencedirect.com

What a bench test found

A study in Minerals Engineering compared dodecylamine, a primary amine, with N,N-dimethyldodecylamine, a tertiary amine, and a third collector with two linked surfactant groups. Under the study conditions, the primary amine removed more silica than the tertiary amine, while the linked surfactant performed best of the three. The researchers also measured how the collectors affected the electrical potential near the quartz surface. sciencedirect.com

The reagent’s role can also vary with the formulation. A separate patent lists dodecyldimethylamine as a froth modifier or collecting booster in a silicate flotation system. If your team is screening a fatty amine, define whether it will serve as the main collector or be tested alongside an existing one. patents.google.com

Compare results on the ore you plan to process

For an initial trial, use the same ore sample, process water, pH, and dosage basis across candidates. Track residual silica in the concentrate alongside recovery of the valuable mineral. That gives the team a way to judge how much silica was removed and how much valuable material stayed in the product.

The published comparison used a defined C12 tertiary amine. A commercial C12–14 alkyldimethylamine grade contains a distribution of chain lengths and should be evaluated on its own trial results. When contacting China Amines Co., Limited about a fatty tertiary amine for screening, specify whether you need the C12 compound or a C12–14 blend, and request the proposed grade specification and a representative COA. sciencedirect.com

Technical references

• Brezáni et al., Minerals Engineering — Reverse froth flotation of magnesite ore
• US20150290659A1 — Flotation of silicates from ores
• OECD — Assessment covering C12 and C12–14 alkyldimethylamines