Secondary Steelmaking Quiz

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Questions and Answers

What is the primary purpose of deoxidation in secondary steelmaking?

To enhance the thermal conductivity of steel

To increase the carbon content of the steel

To remove excess oxygen before casting (correct)

To incorporate additional alloying elements

Which element has the lowest deoxidation capacity in steelmaking?

Carbon (correct)

Silicon

Manganese

Aluminium

What is a key objective of secondary steelmaking regarding hydrogen?

To add hydrogen for enhanced strength

To monitor hydrogen as a reactive component

To increase hydrogen content for improved ductility

To remove hydrogen to very low levels (correct)

Which of the following is NOT a method of secondary refining in steelmaking?

Casting Systems Signup and view all the answers

What happens during the deoxidation process in the ladle?

A reaction occurs and homogeneity is achieved Signup and view all the answers

What is the minimum percentage of iron (Fe) required for pellets classified as blast furnace grade?

65% Signup and view all the answers

Which parameter has a maximum specification of 5% for pellets?

Na2O Signup and view all the answers

What is the maximum allowable moisture content for pellets during monsoon?

6% Signup and view all the answers

What is the minimum Tumble index required, according to the tumbler test?

94.00% Signup and view all the answers

Which of the following represents the correct basicity specification for pellets?

0.40 Signup and view all the answers

What is the maximum limit for the size fraction of pellets that fall within -5mm?

5% Signup and view all the answers

What is the minimum compressive strength of a pellet?

250 KG/PELLET Signup and view all the answers

Which property of coking coal indicates a better quality with lower values?

Percentage of Ash Signup and view all the answers

What does the Free Swelling Index (FSI) measure?

The increase in volume of coal when heated Signup and view all the answers

What is the maximum swelling percentage permitted in high-quality pellets?

20% Signup and view all the answers

Which of the following is NOT a source of Indigenous coking coal?

USA Signup and view all the answers

Inherent moisture in coal is associated with which characteristic?

Maturation of coal Signup and view all the answers

The Mean Max Reflectance (MMR) helps in determining which aspect of coal?

Strength of coke Signup and view all the answers

Which test measures the rheological properties of coal?

Gieseler Fluidity Signup and view all the answers

Imported coking coals are named after which criterion?

The name of countries Signup and view all the answers

What does the Gieseler Fluidity test NOT provide information about?

Ash content Signup and view all the answers

What factor should be maximized to produce sinter at a lower cost?

Specific productivity Signup and view all the answers

Which of the following is NOT an advantage of sintering?

Increased dust pollution Signup and view all the answers

What is the role of super fluxed sinter in blast furnaces?

Reduces coke consumption Signup and view all the answers

Which piece of equipment is used specifically for lifting coke?

Grab cranes Signup and view all the answers

How does sintering improve blast furnace operation?

By reducing logistics requirements Signup and view all the answers

What should be maintained to control dust pollution in the sinter plant?

Efficient ventilation Signup and view all the answers

Which parameter should ideally be low to optimize sinter production?

Specific power consumption Signup and view all the answers

What is the significance of the higher softening temperature of sinter?

It enhances the volume of the granular zone Signup and view all the answers

What is the minimum percentage of crushed coke used in the base mix preparation?

5-6% Signup and view all the answers

Which raw material is utilized as a substitution for Blast Furnace grade Lime Stone?

BOF slag Signup and view all the answers

What type of material is screened out and sent to the blast furnace as nut coke?

Coke of size fraction (+12.5mm) Signup and view all the answers

Which of the following customers would not use base mix?

Coke Plant Signup and view all the answers

How does RMHP/OHP/OB&BP minimize undersize in iron ore lump?

By implementing a screening process Signup and view all the answers

What is one of the safety measures recommended in RMHP/OHP/OB&BP?

Using dust masks Signup and view all the answers

What primary benefit does centralized raw material facility provide?

Consistent quality raw materials Signup and view all the answers

What percentage of metallurgical waste is used in base mix preparation?

1% Signup and view all the answers

What is the maximum moisture content indicated for Coke Breeze?

15% Signup and view all the answers

Which equipment is primarily used for mechanized unloading of wagons?

Wagon Tippler Signup and view all the answers

What does the Screening Unit primarily do in the process flow?

Screens to acquire desired size material Signup and view all the answers

Which of the following materials is NOT indicated as part of the raw mix from mines?

Sand Signup and view all the answers

What is the primary function of the Belt Conveyors in the material handling process?

Conveying materials to destination Signup and view all the answers

What is crucial for the successful operation of material handling systems according to logistics?

Planning of raw material requirements Signup and view all the answers

Which equipment is used specifically for reclaiming materials from beds?

Bucket Wheel Signup and view all the answers

Which type of raw material has a fixed composition relating to Coke Breeze?

SiO2 Signup and view all the answers

Study Notes

General Plant Operations Engineering

This document is from Steel Authority of India Limited
It details General Plant Operations Engineering.

Raw Material Handling Plant

Introduction to Raw Material Handling Plant (RMHP)
Different types of raw materials used in integrated steel plants (Iron Ore, Limestone etc.)
Quality requirements of raw materials (chemical specifications for various materials)
Process and flow diagram of RMHP
Material handling equipments
Customers of RMHP
Benefits of RMHP
Safety procedures for RMHP

Coke Ovens and Coal Chemicals

Introduction to Coke Ovens and Coal Chemicals
Properties of coking coal
Coal handling plant
Carbonization process
Properties of coke
Coal chemicals (by-products of coke ovens)
Pollution control norms
Safety procedures for Coke Ovens and Coal Chemicals
ISO 45001:2018 – OH&SMS

Sinter Plant

Introduction to Sintering Process
Quality parameters of sinter (subject to BF requirements)
Sintering process (different zones/steps explained)
Main areas/ equipments in the Sinter Plant
Safety hazards at the sinter plant
OHSAS-18001 assessment series

Blast Furnace

Introduction to Blast Furnace
Raw materials and their quality
Blast furnace and accessories
BF zones and chemical reactions
Safety and environment

Rolling Mills

Basics of rolling
Products of rolling mills of SAIL (various sections - flat products, long products etc.)
Applications of rolled products of SAIL
Hot rolling
Reheating furnaces
Rolling of flat products and long products
Cold rolling
Major cold rolling defects.
Rolling of special steels (e.g., stainless steel)

General Mechanical Maintenance

Introduction to maintenance
Objectives/ goals of the maintenance system
Different maintenance systems (breakdown, preventive, planned, predictive)

Electrical and Electronics

Basic electrical engineering
Electric Circuits
Current (Alternating and Direct)
Alternating current
Phase angle
Voltage or Potential Difference.
Resistance
Power and Energy in circuits
Real, Apparent and Reactive Power, and Power factor
Basic principles of Transformer
Basic components of an ideal transformer
Types of transformers

Instrumentation and Process Control functions

Instrumentation and Process Control functions in an Integrated Steel Plant
Process parameter measurements
Activities in Instrumentation (Round the clock measurement and control of parameters, Maintenance of equipment, evolving efficient control strategies, etc.)
Types of Maintenance (Preventive, Predictive, and Breakdown)
Calibration and maintenance of process instruments.
Latest Trends in Maintenance
Computer Managed Maintenance System (CMMS)
Condition Based Maintenance System (CBMS)
Types of Actuators (Pneumatic, Hydraulic, Solenoid, Electric Motor)

Electrical Insulation

Insulating materials.
Electrical insulation standards

Electrical Devices

Introduction to Electronic Devices
Types of Electronic Devices
Passive Components-
Active Components-
Resistances

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Description

This quiz tests your knowledge on various aspects of secondary steelmaking processes, including deoxidation, pellet specifications, and coking coal properties. Answer questions about key objectives and specifications that are crucial in steel production and refining methods. Perfect for students and professionals in metallurgical engineering.