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Abstract

The invention relates to a method for manufacturing a concentrate enriched in iron mineral content from an ore, which contains an iron mineral and silicate, by reverse flotation, which method comprises the step of (c) adding a compound of formula I wherein R¹ is C₉-C₂₂ alkyl or alkenyl, which is linear or branched, R² is H, C₁-C₄ alkyl, which is linear or branched, R³ is —X—NH₂, H or C₁-C₄ alkyl, which is linear or branched, and X is C₂-C₄ alkylene, which is linear or branched, or a salt of a protonated compound of formula I and an anion, to a prepared aqueous pulp of the ore and optionally one or more flotation auxiliaries to obtain an aqueous mixture. Furthermore, a method for manufacturing a specific group of compounds of formula I, i.e. compounds of formula 1-X wherein R¹ is C₉-C₁₅ alkyl, which is linear or branched, R² is H, R³ is —X—NH₂ and X is C₂-C₄ alkylene, which is linear or branched, is disclosed.

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First Claim