ION FLOTATION ANDPRECIPITATE FLOTATION

SISKA PRIFIHARNI3334090902

Assalamu’alaikum

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OUTLINE

• Introduction• Kinds of Recovery• Ion Flotation and Precipitate Fltation• Basic Principles of Flotation• Kinds of Reagent Flotasi• References

INTRODUCTION

HIDROMETALLURGYHIDROMETALLURGY

LeachingLeaching RecoveryRecovery

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CONT...

What is leaching?Leaching is the process of extracting a soluble constituent from a solid by means of a solvent.

What is recovery?

Process recovery of precious metals from leach solution.

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KINDS OF RECOVERY

• Criztalitaton• Adsorption• Ionic Precipitation• Precipitation by Metals/Cementation• Precipitation by Gases• Ion Flotation and Precipitate Flotation• Ion Exchange• Solvent Extraction• Electrolysis

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ION FLOTATION AND PRECIPITATE FLOTATION

Ion flotation was introduced by F. Sebba in 1959

Ion flotation and precipitate flotation is one of metal recovery methods from leach solution with the principle of flotation.

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Basic Principles of Flotation

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Cont...

The attachment of air bubbles to hydrophobic particles. The buoyancy of the bubbles then carries these particles to the surface, leaving the hidrophilic particles behind

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A contact angle near 90° is sufficientfor effective froth flotation in most cases

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γ(sv) = γ(sl) + γ(lv) cosθ

KINDS OF REAGENT

• Collector

The purpose of collector is to change properties of mineral surface from hydrophilic to hydrophobic.

e.g: fatty acid• Frother

The purpose of frother is to stabilize the bubbles formed during flotation so that the bubbles is about to burst after reaching the surface.

e.g: MIBC

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Cont...

• Modifier consists of several reagent:o pH regulator to change the pH in the process

e.g: CaO, Na2CO3

o Dispersant to spread evenly the bubles in all direction

e.g: Na2SiO3

o Depresant to prevent mineral not to float

e.g: CN-, Zn2+

o Activator to activate the collectors.

e.g: Cu2+, Ca2+, Na2S

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Table 1. Flotation of Metal Ions with Soap

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Table 2. Floatability of Metal Hydroxides

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Figure 1. Effect of pH on the Separation of Metal Hydroxides with Flotation

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REFERENCES

• Habashi, F. 1980. “Extractive Metallurgy ”, volume 2, Gordon and Breach, New York and London.

• Bulatovic, Srdjan M. 2007. Handbook of Flotation Reagents. Ontario: Canada

• http://www.chem.mtu.edu/chem_eng/faculty/kawatra/Flotation_Fundamentals.pdf

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THANK YOU FORYOUR ATTENTION

WASSALAM

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