Zinc ppt

Zinc

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1

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Purification BY : -ANIL MAURYAELECTRICAL & ELECTRONICS ENGINEER

•Chemical Formula :- Zn

• Atomic Number :- 30

Introduction

• Atomic Number :- 30

•It is bluish white to silvery-gray in colour.

• It is hard and brittle at most temperatures.

ANIL MAURYA ELECTRICAL & ELECTRONICS ENGINEER 2

History of zinc

� Zinc was discovered in the metallic form.

� In 1374, Zinc was discovered & the 8th metal known to man.

�In 1743, the first Zinc smelter was established in U.K.

�In India, Hindustan Zinc was established in 1966.�In India, Hindustan Zinc was established in 1966.


Uses Of Zinc

1. As an Anti-Corrosive agent.

2. Process of galvanization, like light posts, metal roofs and car bodies.

3. Also used as an anode material in batteries.3. Also used as an anode material in batteries.

4. Coating to protect iron and steel.

5. ZnO is also used in rubber to protect it from UV radiation.

6. Alloyed Zinc is used in pipes,

instruments, hardware

and water valves.


Zinc Production & ReservesCountry Production Reserves

United states 720 12000

Australia 1450 53000

Bolivia 430 6000

Canada 670 6000

China 3500 42000

India 750 11000India 750 11000

Ireland 350 2000

Kazakhstan 480 16000

Mexico 550 15000

Peru 1520 23000

Other Countries 1580 62000

Total 12000 250000


Data is in thousand metric tons.


Process figure

Roasting

� The Fluid Bed Roaster is used in the process zinc sulfideconcentrates.

� Zinc sulfide concentrates is introduced directly into theroaster.

� Zinc sulfide concentrates is introduced directly into theroaster.

� Roasted material largely consisting Zinc Oxide(ZnO).

ZnS+5/2O2 ZnO + SO4


Leaching� The Zinc Calcine from the roasting process is fed for

leaching process.

� Continuous pH monitoring is facilitated by submerged pH cells in controlled tanks.cells in controlled tanks.


Purification� Zinc oxide is converted into Zinc Sulphate by

adding Zinc Dust.

�In purification plant metallic impurities such as Cd,Cu, Ni, Co are also removed.


Electrolysis� In electrolysis plant Zinc is recovered

from Zinc Sulphate.

� After the purification process Zn isconverted in zinc anode and zinccathode by passing the electric current.cathode by passing the electric current.


Melting and CastingAutomatic System for Melting and Casting are used inmaking slabs & Jumbos Casting Machine.


Gas CleaningThe hot dust-laden roaster gas is cooled and dedusted through the Gas Cleaning system.

� Waste Heat Boiler

� Hot Electrostatic Precipitator (ESP)

� Wet Gas Cleaning

� Cooling

� De-Dusting

� SO2 Gas Scrubbing

� Wet Gas Electrostatic Mist Precipitator (Mist EP)� Wet Gas Electrostatic Mist Precipitator (Mist EP)

� Mercury Removal

� Zinc Oxide Scrubbing

� Flue Gas Desulfurization (FGD)


Sulfuric AcidFor the treatment of Sulfur Dioxide (SO2) in the roasting off-gas, by passing through the Gas Drying Tower, the Sulfur Dioxide (SO2) Gas(SO2), cooled and saturated with water vapor, comes in direct contact with concentrated acid. Sulfuric Acid(H2SO4) of this concentration is very hygroscopic (absorbs waters) and the gas is practically free from water vapor after leaving the Drying Tower.


Application � Automotive

� Buildings and Concentration Industries

� Hot dip galvanizing

� Zinc Castings


Automative

Improved coatings have encouraged thedevelopment of new application, for example,galvanized steel with a very fine surface finish isused to produced the parts of car bodies that arevulnerable to corrosion.vulnerable to corrosion.


Zinc CastingsTwo zinc casting alloys of any commercialsignificance zinc 4% Aluminum pressure castingalloys with and without 1% Copper. Zinccastings find a range of applications formautomobiles to zip fasteners.

ANIL MAURYAELECTRICAL & ELECTRONICS ENGINEER 16

Hot dip galvanizingIt in its original form as applied to fabricate steel work is also a growing industry


Zinc ppt

Engineering

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