Answered: Titanium dioxide (TiO2) is used…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Titanium dioxide (TiO₂) is used extensively as a white pigment. It is produced from an ore that contains ilmenite (FeTiO₃) and ferric oxide (Fe₂O₃). The ore is digested with an aqueous sulfuric acid solution to produce an aqueous solution of titanyl sulfate [(TiO)SO₄] and ferrous sulfate (FeSO₄). Water is added to hydrolyze the titanyl sulfate to H₂TiO₃, which precipitates, and H₂SO₄. The precipitate is then roasted, driving off the water and leaving a residue of pure titanium dioxide. (Several steps to remove iron from the intermediate solutions as iron sulfate have been omitted from this description.)

Suppose an ore containing 23.3% Ti by mass is digested with an 80.0% H₂SO₄ solution, supplied in 60.0% excess of the amount needed to convert all the ilmenite to titanyl sulfate and all the ferric oxide to ferric sulfate [Fe₂(SO₄)₃]. Further, suppose that 92.0% of the ilmenite actually decomposes. Calculate the masses (kg) of ore and 80.0% sulfuric acid solution that must be fed to produce 1000 kg of pure TiO₂.

kg ore

kg 80.0% H₂SO₄

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