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Experimental and kinetic study of zinc leaching from metallurgical slag by 5-sulfosalicylic acid

Wang Long, Gao Hanyu, Song Shimin, Xue Na, Zhang Jinxia, Yang Siyuan, Liu Cheng

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 3

8--20

As an organic acid with the characters of low corrosivity and extensive source, 5-sulfosalicylic acid (5-SSA) was firstly utilized as a potential leaching reagent for the recovery of zinc from metallurgical slag. Effects of stirring speed, leaching temperature, 5-SSA concentrations and size fraction on the leaching zinc leaching rate were investigated. A zinc leaching efficiency of 94.2% was achieved under the appropriate operating conditions (450 rpm of stirring speed, 50 ℃ of leaching temperature, 0.3 mol/L of 5-SSA concentration and d90=65 µm of size fraction), indicating that 5-SSA was an excellent leaching reagent of zinc oxide. SEM-EDS and specific surface aperture analyzer further reveal the well-developed micropores and cracks from zinc metallurgical slag, which could be assigned to the removal of zinc oxide encapsulated in the sample. In addition, the leaching kinetics of zinc metallurgical slag in the 5-SSA was studied. It was found that the surface chemical reaction model satisfactorily predicted the zinc leaching rate. A reaction kinetic equation was finally established for the zinc leaching rate.

Indirect complexometric determination of thorium(IV) using 5-sulfosalicylic acid as masking agent

Sreekumar N. V., Narayana B., Nazareth R. A., Bhat N. G., Hegde P., Manjunatha B. R.

Chemia Analityczna

2002

Vol. 47, No. 5

759-764

A complexometric method for the determination of thorium(IV) in the presence of other metal ions based on the selective masking ability of 5-sulfosalicylic acid towards thorium is described. Thorium(IV) present in a given sample solution is first complexed with a known excess of EDTA and the surplus EDTA is titrated against bismuth nitrate solution at pH 2-3 using xylenol orange as indicator. A known excess of 5-sulfosalicylic acid (10%) is then added, the mixture is shaken well, and the EDTA released from the Th-EDTA complex is titrated against standard bismuth nitrate solution. Reproducible and accurate results are obtained for 4.6 mg to 232 mg of thorium with relative errorš0.43% and standard deviation <0.62 mg. The interference of various ions was studied. The method is applied for the determination of thorium in alloy solutions.

Opisano kompleksometryczną metodę oznaczania toru(IV) w obecności innych jonów metali. Metoda jest oparta na zdolności kwasu 5-sulfosalicy lowego do selektywnego maskowania toru(IV). Tor(IV) obecny w danej próbce jest początkowo kompleksowany znanym nadmiarem EDTA, który odmiareczkowuje się roztworem azotanu bizmutu przy pH 2-3 wobec oranżu ksylenolujako wskaźnika. Następnie jest dodany znany nadmiar 10% kwasu 5-sul-fosalicylowego, odczynniki dokładnie miesza, a EDTA, uwolniony z kompleksu Th-EDTA, miareczkuje się standardowym roztworem azotanu bizmutu. Odtwarzalne i dokładne wyniki uzyskuje się dla toru w zakresie stężeń od 4.6 do 232 mg. Względny błąd wynosi š0.43 %, a odchylenie standardowe — <0.62 mg. Badano też interferencje różnych jonów. Metoda była stosowana do oznaczania toru w roztworach stopów.