Resumo

GUTIERREZ-OLMOS, Jorge Rafael  e  ROJAS-VARGAS, Armando. Filtration resistances of nickel carbonate. RTQ [online]. 2018, vol.38, n.1, pp. 17-28. ISSN 2224-6185.

In the present work, the filtration of nickel carbonate was studied experimentally to laboratory scale, to evaluate the effects of suspension pH, chemical composition and fineness of the salt over of specific cake resistance and the medium resistance.  The filtration was realized to a temperature of 80 ºC, 16 % in weight of solids and constant pressure drop of 3,758.104 N/m, applying as membrane the Kraft paper. It was obtained that by increasing the concentration of carbon dioxide on salt (1,9 to 4,4 %), it diminishes the content of sulphur (3,09 to 1,84 %) and the specific cake resistance. It was showed the pH’s range for the minimum of specific resistance and cake humidity; when the pH increases from 7,40 to 8,76, increment the concentration of solids in the filtrate from 38 to 105 mg/l. To smallest pH than 7,82, the inferior values of average particle diameter (dp) was obtained; and the specific cake resistance incremented due to the combined effect between the variables: Concentration of carbon dioxide in salt, the pH of the suspension and dp. A model to estimate the specific cake resistance were proposed.

Palavras-chave : nickel carbonate; pH; filtration resistances.

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