recovery nickel from pregnant solution by precipitation gases hfm

7/31/2019 Recovery Nickel From Pregnant Solution by Precipitation Gases Hfm

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Hidro-Elektrometalurgi14 Mei 20121


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Recovery Nickel from PregnantSolution by Precipitation Gases

Hesga Fadiastian3334091321

Hidro-Elektrometalurgi14 Mei 2012

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Outline

Introdunction

Kinds of Recovery

Recovery Nickel from PregnantSolution by Precipitation Gases

AplicationsConclusions

ReferencesHidro-Elektrometalurgi

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Introduction

Nickel ore in the world are classified into

two types, nickel sulfide ores and nickel oxide,

commonly called laterite.

Melting Point at 1455 C

Boiling Point at 2913 C

Ferromagnetic

Hidro-Elektrometalurgi

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(Cont)

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HIDROMETALLURGY

Leaching Recovery



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Leaching is theprocess ofextracting a soluble

constituent from asolid by means of asolvent

Process recovery ofprecious metalsfrom leach solution

solvent.

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+CRIZTALITATON

+ADSORPTION

+ IONIC PRECIPITATION

+ PRECIPITATION BY METALS/CEMENTATION+ PRECIPITATION BY GASES

+ ION FLOTATION AND PRECIPITATE

+FLOTATION

+ ION EXCHANGE+ SOLVENT EXTRACTION

+ ELECTROLYSIS

Kinds of Recovery

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Recovery Nickel

Hydrogen Sulfide Hydrogen



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By H2S

In Precipitating by H2S the following points should be takeninto consideration :

+ A number of metal sulfides are complexed by H2S to give

solube complexes of the types MS.n

H2S. Therefore thesolubility of metals sulfides in H2S saturated water is muchgreater than in distilled water

+ Precipitation may be greatly accelerated by the addition ofa catalyst

+ The faster a precipitation reaction proceeds, precipitatemore than smooth

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(Cont)

+ Acid is generated during precipitationM2+ + H2S MS + 2H

+

At the Moa Bay Plant, Cuba for recovering itwas based on H2S precipitation. The ore

containing 1.35% Ni and 0,15% Co isleached with sulfuric acid at 230oC and 500psi.

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Flow Sheet at Moa Bay plant

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By Hydrogen

Precipitation by gas occurred in hightemperature and high pressure

This method is most economical when

applied to concentrated solutions

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Thermodynamics Aspect

M2+ + H2M + 2H+

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)2HalogK(logpH22Malog

)2Ha)(2Ma(

2Ha

K



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Kinetics Aspect

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Using nickel powder as a catalyst

The activation energy in the temperaturerange 150-175oC is 13,7 kkal/mol

And in the temperature range 175-200oC is

5,7 kkal/mol


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Precipitation nickel from an acid medium takes place homogeneusly

In a fact we must used heterogen not homogen because Equlibriumconditions are more favorable

At the Sherrit Gordon Plant, the purified leach solution obtained by amonical

pressure leaching of Ni-Co sulfide concentrate contains 45g/l Ni, 1 g/l Co,350 g/l ammonium sulfate and enough free ammonia to give an[NH3]/[Ni

2+] + [Co2+]=2

The purified solution is reacted with H2 at 500 psi and 200oC. Ni will be

precipitated and Co still in solution


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Flow sheet in Sherrit Gordon Plant

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Conclusions

recovery nickel by precipitation can directlyproduce metallic

H2S And H

2can be used in recovery nickel

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References

Habashi, F. 1980. Extractive Metallurgy ,volume 2, Gordon and Breach, New Yorkand London.

The Canadian Encyclopedia

www.google.com


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Thank You forYour Attentions


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recovery nickel from pregnant solution by precipitation gases hfm

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