Metrological assurance for the analytical control of flotation reagents based on aliphatic alkoxyamines in technological media and waste of iron ore enrichment processes

Methodological developments related to the determination of the content of cationic flotation reagents (collectors) based on aliphatic alkoxyamines (Flotigam EDA, Tomamine M-4213, Feiying: TG-928) in technological media and waste of iron ore enrichment processes are considered to ensure the analytical control of technological processes in view of a danger character of generated waste. A spectrophotometric method for determination of cationic amino-containing surfactants can be used for express- and screening analysis. The method of gas chromatography was used to increase the reliability of alkoxyamine measurement and in arbitration cases. The ranges of determinable content for the photometric method in aqueous media were 0.04 – 100 mg/dm3 (extended uncertainty from 20 to 25%) and 3 – 1000 (extended uncertainty from 22 to 30%) in solid media; whereas for gas chromatographic procedure the content ranged within 0.02 – 100 mg/dm3 (extended uncertainty from 20 to 25%) in aqueous media and from 1.0 to 1000 mg/kg (extended uncertainty from 20 to 30%) in solid media, respectively. The methods for determination of the main components, alkoxyamines, in commercial compositions of amine-containing flotation reagents are also presented. The methods have been tested in modeling flotation procedures (to optimize relevant conditions and regimes of real production), certified and included in the Federal State Information System (FSIS) «Arshin».