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The influence of flotation reagents on sulfur-oxidizing bacteria Acidithiobacillus thiooxidans

Pacholewska M., Cwalina B., Steindor K.

Physicochemical Problems of Mineral Processing

2008

Vol. 42

37-46

It has been demonstrated that various flotation reagents influence, in a different manner, the metabolic activity of the sulfur-oxidizing bacteria Acidithiobacillus thiooxidans (strain C1 being isolated from the Fe-Zn tailings water) growing in the Waksman/Joffe (W/J) liquid culture medium that contains thiosulfate as a sole energy source for bacteria growth. The ethyl- and amyl xanthates as well as the frothing reagent stimulated, to a limited extent, the tested C1-bacteria metabolic activity. The very well documented bacterially-influenced acidification of the W/J solution supplemented with the ethylor the amyl xanthates suggests the possibility of these substances effective acid-degradation in the post-industrial environments rich in various flotation reagents, mainly xanthates. Both the activator containing the carbamate ethyl-derivative and the modifier composed of Cu(II)-ions caused a complete inactivation of the A. thiooxidans C1-metabolism. It is suggested that some unexpected chemical reactions may proceed in the tested systems, as a result of interactions between the culture medium components, flotation reagents, their decomposition products, and also the products of bacterial metabolism.

Tribological performance of some polyethoxy glycol esters of dithophosphate and dithiocarbonate acid derivatives

Wesołowski W., Margielewski L., Celichowski G.., Płaza S.

Tribologia

1999

nr 3

333-354

Tribological properties of water solution of some polyehoxy glycol esters of dithiophosphorate and dithiocarbonate acid derivatives has been tested with using four-ball and pin-on-disk machines. The wear, weld loads and friction coefficient werw estimated.Worn surfaces of balls were analysed with using SEM/EDS technique>thermal stability of additives was investigated with DTA analysis.

Właściwości tribologiczne roztworów wodnych pochodnych kwasu ditiofosforowego i ditiowęglowego badano za pomocą aparatów :czterokulkowego i tzpień-tarcza.Oznaczono zuzycie, obciążenie zespawania i współczynniki tarcia.Powierzchnie zużycia na kulakach analizowano za pomocą SEM/EDX.Termostabilność zsyntetyzowanych dodatków badano za pomocą DTA.