Process for purifying a technical iron chloride solution by...

C - Chemistry – Metallurgy – 01 – G

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C01G 49/10 (2006.01)

Patent

CA 2112076

A process for purifying an acidic technical-grade iron chloride solution formed from cyclone dust from the production of TiO2 in accordance with the chloride process by adjusting the pH with a first neutralizing agent and thereafter introducing the pH adjusted solution in a controlled manner into a solution containing a second neutralizing agent. In this process undesired ions which are to be separated, such as chromium, vanadium, zirconium and/or niobium, precipitate in the form of efficiently filterable hydroxides which can be separated industrially under economical conditions by filtration. The filter cake is non-hazardous and can safely be disposed of by dumping. Calcium carbonate is the preferred neutralizing agent, and the pH adjustment may also advantageously be effected by using scrap iron or by using iron sinters with reduction of any Fe(III) ions before the second neutralization step.

Un procédé pour purifier une solution acide de qualité technique de chlorure de fer, produite à partir de poussière de cyclone lors de la production de TiO2 conformément au procédé au chlorure, en ajustant le pH à l'aide d'un premier agent de neutralisation pour ensuite introduire la solution à pH ajusté, de façon contrôlée, dans une solution qui contient un second agent de neutralisation. Dans ce procédé, les ions indésirables qui doivent être séparés, tels ceux de chrome, de vanadium, de zirconium et/ou de niobium, précipitent sous forme d'hydroxydes pouvant être efficacement filtrés, qui peuvent être séparés économiquement par filtration à l'échelle industrielle. Le gâteau de filtration est inoffensif et peut être éliminé de manière sécuritaire par déchargement. Le carbonate de calcium est l'agent de neutralisation de premier choix et l'ajustement du pH peut aussi être effectué avantageusement en utilisant de la ferraille ou des agglomérés de fer, puis en réduisant tout Fe(III) présent avant la seconde étape de neutralisation.

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