metal alloys making
DESCRIPTION
Metal allow making presentationTRANSCRIPT
METAL ALLOYSMaking Process
Iron and Steel
Making Process
From Iron Ore and Limestone
Blast Furnace
Iron Ore Pig IronMelting
Iron
Blast Furnace
Blast Furnace Video
Steel is produced in the furnace of steel
from pig iron, either in the form of solid,
liquid, scrap metal and some metal
alloys.
Some of steel-making process:• Basic oxygen furnace
• Electric furnace
Steel Making
The liquid metal is inserted into the combustion chamber (tilted and enforced)
Oxygen (+ 1 000 ˚C) is blown through the Oxygen Lance into the combustion chamber at high speed with pressure 1400kN/m2
Added powdered lime (CaO) to reduce levels of P and S
Advantages of the Basic Oxygen Furnace:• Using the pure CO2 without Nitrogen
• The process was only + 50 minutes
• Phosphorous and sulfur expelled earlier than Carbon
• low operating costs
Basic Oxygen Furnace
Basic Oxygen Furnace
Conducted in high temperature and using the arc light electrodes and electric induction
Advantages:• Easy to reach high temperatures in a short time
• Temperature can be set
• kitchen high thermal efficiency
• The liquid iron is protected from dirt and environmental influences, so the quality is good
• The loss due to evaporation is very small
Electric Furnace
Electric Furnace
Steel Making
Aluminum Making Process
Step 1: crushing and grinding
alumina recovery begins by passing the bauxite through screens to sort it by size
The ore is then fed into large grinding mills and mixed with a caustic soda solution
The material finally discharged from the mill is called slurry.
Step 2 : digesting
1. The slurry is
pumped to a
digester where the
chemical reaction to
dissolve the alumina
takes place.
Step 3- Settling
The liquor at the top
of the tank (which
looks like coffee) is
now directed through
a series of filters
Step 4 : precipitation
The clear sodium aluminate from the settling and filtering operation is pumped into these precipitators. Fine particles of alumina -called "seed crystals" (alumina hydrate) - are added to start the precipitation of pure alumina particles as the liquor cools.
Calcination is a heating process to remove the chemically combined water from the alumina hydrate.
The result is a white powder like that shown below: pure alumina. The caustic soda is returned to the beginning of the process and used again.
Stage 2: converting alumina to
alumunium
Electrolysis reduction by Hall-Herault
process
Reacted in a melted of kriolit (Na3AlF6)
in a steel vessel 950oC.
Alumunium Making
Titanium Making
Thanks for your attention