Optimization of the crystallization of ferrous sulfate heptahydrate

Abstract

The purpose of this study was to create a pickling process capable of recycling spent sulfuric acid containing greater than 35 g/1 of dissolved ferric sulfate and the optimization of the crystallization of ferrous sulfate heptahydrate. In addition, rinse water was generated from the pickling process and required purification studies. The spent sulfuric acid solution containing the dissolved ferric sulfate was converted to a solution of dissolved ferrous sulfate on an active iron surface. The dissolved ferrous sulfate was crystallized at low temperature to generate ferrous sulfate heptahydrate crystals and a low iron content sulfuric acid solution. The rinse water generated from the pickling process was recycled and purified with a sulfonic acid ion exchange resin. The strong acid resin was operated in the sodium cycle and was regenerated with 10% v/v sulfuric acid and 4% v/v sodium hydroxide. The resin displays high capacity for both ferrous and ferric ions in a pH range of 2.0 to 2.5. Sulfuric acid and hydrogen peroxide studies were also conducted to optimize the pickling process.

Notes

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Graduation Date

1993

Semester

Spring

Advisor

Clausen, Christian

Degree

Master of Science (M.S.)

College

College of Arts and Sciences

Department

Chemistry

Format

PDF

Pages

63

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0028676

Subjects

Arts and Sciences -- Dissertations, Academic; Dissertations, Academic -- Arts and Sciences

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