Primary Steel Making - Mineral Processing and Extractive Metallurgy - Metallurgical Engineering Previous Year Questions

1

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2007

Identify the incorrect statement with reference to LD steel making

A

The temperature of the LD furnace is maintained at around 1600 °C.

B

The basicity of slag is maintained at around unity.

C

Dephosphorization and decarburization should proceed simultaneously.

D

High silicon hot metal may lead to slopping.

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2

2008 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2008

Manganese recovery in steelmaking is aided by

A

oxidizing slag

B

reducing slag

C

high temperature

D

low temperature

E

acidic slag

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3

2008 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2008

Given the following assertion 'a' and the reason 'r', the correct option is
Assertion a: Phosphorous removal in steelmaking is favoured by basic slag
Reason r: Basic slag decreases the activity of P₂O₅ in the slag

A

Both a and r are true and r is the correct reason for a

B

Both a and r are false

C

a is true but r is false

D

Both a and r are true but r is not the correct reason for a

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4

2009 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2009

If the operator treats 1000 kg of liquid steel with 100 kg of slag, the resulting phosphorous content in liquid steel will be

A

0.001 %

B

0.002 %

C

0.010 %

D

0.018 %

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5

2010 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2010

In a basic oxygen furnace, under appropriate conditions, which of the following statements is NOT correct?

A

Carbon can be removed in preference to P and S

B

Phosphorus can be removed in preference to C and S

C

Sulphur can be removed in preference to C and P

D

Carbon and phosphorus can be removed in preference to S

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6

2011 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2011

Which one of the following refractory materials is NOT used in the BOF (LD) working lining?

A

Tar-bonded dolomite

B

Pitch-bonded magnesite

C

Fired and pitch-impregnated magnesite

D

Graphite-alumina composite

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7

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2012

During LD blow in steelmaking the impurity that gets removed first is

A

Carbon

B

Phosphorous

C

Manganese

D

Silicon

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8

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2012

The sulphide capacity (C_S) of liquid slag of composition 55 wt.% CaO, 20 wt.% SiO₂, 15 wt.% Al₂O₃, and 10 wt.% MgO is given by the following equation
\[ \log C_S = 3.44 \left(X_{CaO} + 0.1 X_{MgO} - 0.8 X_{Al_2O_3} - X_{SiO_2}\right) - (9894/T) + 2.05 \]
where, X is mole fraction of the respective components. Atomic weights of Ca, Mg, Si, Al and O are 40, 24, 28, 27 and 16 respectively.
The value of C_S at 1900 K is

A

0.0009

B

0.009

C

0.09

D

0.9

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9

2013 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2013

In L-D steelmaking, the final slag can be best described as

A

oxidizing

B

basic

C

oxidizing and basic

D

reducing and basic

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10

2014 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2014

Which one of the following factors is NOT desirable for effective phosphorus removal in BOF steelmaking process?

A

Higher FeO level in slag

B

Higher basicity

C

Higher temperature

D

Lower temperature

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11

2016 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2016

A sub-lance is used to monitor composition and temperature in

A

BOF

B

Ladle refining furnace

C

Continuous casting mould

D

Blast furnace

Check answer

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12

2017 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2017

In primary steelmaking, dissolved oxygen (O) reacts with carbon (C) to produce CO (g), at 1 atm pressure according to the reaction: C + O = CO (g). The equilibrium constant for this reaction is: logK = \(\frac{1160}{T} + 2.003\), where T is in Kelvin. Assuming Henrian activity coefficient of both O and C to be unity, the dissolved oxygen content (in wt.%) of a plain carbon steel melt with 0.7 wt.% C at 1600°C is__________ (answer up to four decimal places)

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13

2018 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2018

To minimize refractory loss during BOF steel-making, slag is supersaturated with which of the following:

A

\(\text{Al}_2\text{O}_3\)

B

\(\text{Fe}_2\text{O}_3\)

C

\(\text{SiO}_2\)

D

\(\text{MgO}\)

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14

2019 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2019

The correct sequence of steelmaking operations is ____________. [BOF: Basic Oxygen Furnace; LF: Ladle Furnace; VD: Vacuum Degassing; CC: Continuous Casting]

A

BOF → LF → VD → CC

B

CC → BOF → LF → VD

C

VD → CC → BOF → LF

D

LF → BOF → VD → CC

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15

2021 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2021

Which one of the following elements oxidizes first in basic oxygen steel making process?

A

Silicon

B

Carbon

C

Manganese

D

Phosphorus

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16

2022 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2022

Which one of the following elements has the slowest removal rate from hot metal in basic oxygen furnace (BOF) steelmaking?

A

Carbon

B

Sulfur

C

Silicon

D

Phosphorus

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17

2023 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2023

For supersonic O₂ jet in basic oxygen furnace steelmaking, choose the correct combination from the following:
(1) Converging-diverging nozzle
(2) Diverging-converging nozzle
(3) O₂ velocity greater than sound velocity at nozzle throat (Mach number > 1)
(4) O₂ velocity equal to sound velocity at nozzle throat (Mach number = 1)
(5) Exit O₂ jet pressure ≥ atmospheric pressure
(6) Exit O₂ jet pressure < atmospheric pressure

A

(1), (4), (5)

B

(1), (3), (6)

C

(2), (3), (5)

D

(2), (4), (5)

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18

2023 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2023

Identify the INCORRECT statement(s)

A

Calcination is typically exothermic and roasting is usually endothermic.

B

Coking of coal is carried out in a shaft furnace.

C

The aims of extractive metallurgy processing are separation, compound formation, metal production, and metal purification.

D

The secondary steelmaking offers steel cleanliness, composition adjustments, and temperature adjustments.

Check answer

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19

2025 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2025

Hot metal from a blast furnace is treated with mill scale prior to oxygen steelmaking for ______.

A

dephosphorization

B

decarburization

C

desulphurization

D

desiliconization

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20

2025 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Primary Steel Making

Metallurgical Engineering (MT) 2025

Which one of the following slag components is responsible for the oxidizing power of steelmaking slags?

A

SiO₂

B

CaO

C

MgO

D

FeO

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