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Zinc oxide, which is produced from the roasting of the ores with oxygen, is leached with aqueous sulfuric acid. This process produces water-soluble zinc sulfate and an insoluble, worthless residue called gangue. The decanted sludge of 20,000 kg/ h contains 5 wt% water, 10 wt% zinc sulfate, and the balance as gangue. This sludge is to be washed with water in a continuous, countercurrent washing system to produce an extract, called a strong solution, of 10 wt% zinc sulfate in water, with a 98% recovery of the zinc sulfate. Assume that the underflow from each washing stage contains, by weight, two parts of water (sulfate-free basis) per part of gangue. Determine the number of stages required.

Zinc oxide, which is produced from the roasting of the ores with oxygen, is leached with aqueous sulfuric acid. This process produces water-soluble zinc sulfate and an insoluble, worthless residue called gangue. The decanted sludge of 20,000 kg/ h contains 5 wt% water, 10 wt% zinc sulfate, and the balance as gangue. This sludge is to be washed with water in a continuous, countercurrent washing system to produce an extract, called a strong solution, of 10 wt% zinc sulfate in water, with a 98% recovery of the zinc sulfate. Assume that the underflow from each washing stage contains, by weight, two parts of water (sulfate-free basis) per part of gangue. Determine the number of stages required.

Introduction to Chemical Engineering Thermodynamics
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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Zinc oxide, which is produced from the roasting of the ores with oxygen, is leached with aqueous sulfuric acid. This process produces water-soluble zinc sulfate and an insoluble, worthless residue called gangue. The decanted sludge of 20,000 kg/ h contains 5 wt% water, 10 wt% zinc sulfate, and the balance as gangue. This sludge is to be washed with water in a continuous, countercurrent washing system to produce an extract, called a strong solution, of 10 wt% zinc sulfate in water, with a 98% recovery of the zinc sulfate. Assume that the underflow from each washing stage contains, by weight, two parts of water (sulfate-free basis) per part of gangue. Determine the number of stages required.  

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