This report contains industrial define problem of pelletizer unit, Essar Oil limited Vadinar. The problem is about corrosion in belt conveyor and the possible suggestions to overcome corrosion with the use of tantalum. Comparison between several metals has been carried out to check out the superiority of different metal under acidic conditions.
Table of Contents
Chapter 1 Introduction to problem.
Chapter 2 Literature survey
Chapter 3 Intro.to pelletizer unit.
3.1 Pelletizer unit introduction.
Chapter 4 Problems in pelletizer unit.
4.1 Problems in pelletizer unit.
Chapter 5 Solution to the problem.
5.1 Why tantalum?
5.2 Hardness of tantalum surface.
5.3 Bond strength of tantalum surface.
5.4 Surface roughness.
5.5 Ruggedness of tantalum surface alloy.
Chapter 6 Tantalum coating Process.
6.1 Tantalum thin coating.
6.2 Tantalum thin coating technique.
6.3 Mechanical cladding process.
6.4 Chemical coating process.
6.5 Comparison of different coating processes.
6.6 Tantalum surface alloy technology.
6.7 Advantages.
6.8 Disadvantages.
6.9 Molten salt tantalum coating.
6.10 Tantalum ore price.
Objectives and Topics
This report focuses on addressing the corrosion challenges faced by the steel belt conveyor in the pelletizer unit at Essar Oil Limited, Vadinar. The primary objective is to investigate the efficacy of tantalum as a protective coating material to enhance the durability of the steel belt when exposed to high-temperature liquid sulfur and acidic conditions.
- Corrosion analysis of steel belt conveyors in industrial pelletizer units.
- Comparative performance evaluation of various metallic and polymer coatings under acidic environments.
- In-depth study of the physical and chemical properties of tantalum for industrial corrosion protection.
- Review of coating technologies including cladding, PVD, thermal spraying, and surface alloy bonding.
Excerpt from the Book
Why tantalum?
Some important physico-chemical properties of the pure chemical element are presented. Besides its excellent chemical resistance tantalum metal exhibits numerous physical properties of interest to chemical engineers. These properties are suited for chemical industries. These additional assets bring tantalum closer to other high performance metals and alloys used in industrial applications. A better electrical conductivity compared to other common refractory metals is responsible for its uses in association with niobium as base metal for platinized anodes as a replacement for titanium. These anodes are widely used for cathodic current protection in sea water and are suited to large surface area plants and vessels when localized anodic current densities. Tantalum is widely used for heat transfer devices working in concentrated acidic media. Its good tensile strength is required for the manufacture of some devices.
Summary of Chapters
Chapter 1 Introduction to problem.: This chapter outlines the corrosion issues affecting the steel belt conveyor due to high-temperature liquid sulfur exposure.
Chapter 2 Literature survey: This section reviews common metallic construction materials and their respective corrosion resistance properties in various chemical environments.
Chapter 3 Intro.to pelletizer unit.: This chapter provides an overview of the Rotoform process and the operational parameters of the pelletizer unit.
Chapter 4 Problems in pelletizer unit.: This section details the specific causes of belt cracking, including pH fluctuations, chloride accumulation, and increased conductivity in cooling water.
Chapter 5 Solution to the problem.: This chapter evaluates tantalum as a potential solution, comparing its hardness, bond strength, and corrosion resistance against other alternatives.
Chapter 6 Tantalum coating Process.: This chapter examines various industrial coating techniques, analyzing the advantages and disadvantages of each to determine the most effective method for tantalum application.
Keywords
Tantalum, Corrosion Resistance, Pelletizer Unit, Steel Belt Conveyor, Industrial Coatings, Sulfuric Acid, Chemical Engineering, Surface Alloy, Cladding, PVD, Thermal Spray, Material Durability, Acidic Conditions, Industrial Process, Metallurgy.
Frequently Asked Questions
What is the primary focus of this report?
The report examines the corrosion of steel belt conveyors within a pelletizer unit and proposes the use of tantalum coatings to improve durability in highly acidic, high-temperature conditions.
What are the central themes of the work?
The central themes include material science, industrial corrosion mitigation, comparative analysis of protective coatings, and the physical/chemical properties of refractory metals like tantalum.
What is the main objective of the study?
The main objective is to identify a suitable protective measure, specifically tantalum, that can withstand the harsh corrosive environment of sulfur pelletization without suffering structural failure.
What scientific methods were employed?
The research involved a literature review of corrosion resistance properties, experimental comparison of different coatings (FEP, Nickel, Xylan, Tantalum) via ASTM G31 immersion testing, and physical tests for hardness and bond strength.
What topics are discussed in the main body?
The main body covers the operation of the pelletizer unit, the root causes of conveyor belt degradation, a comparative study of various metals and polymers, and an analysis of different tantalum coating techniques such as CVD and mechanical cladding.
Which keywords characterize this work?
Key terms include tantalum, corrosion resistance, pelletizer, belt conveyor, acid resistance, surface alloy, and material durability.
Why does the belt conveyor in the pelletizer unit experience corrosion?
The corrosion is primarily caused by the high temperature of the liquid sulfur (up to 125°C) and the presence of acidic byproducts formed in the cooling water, compounded by chloride accumulation.
How does the Tantaline process differ from other coating methods?
Unlike line-of-sight processes like thermal spraying or PVD, the Tantaline process is geometry-independent and occurs on an atomic level, creating a pinhole-free, dense, and stress-free tantalum surface alloy.
What was the result of the comparative corrosion tests?
The tests indicated that the Tantaline tantalum surface alloy was the only material to pass all immersion tests in various corrosive media without showing signs of corrosion or failure.
- Quote paper
- Omprakasah Sahu (Author), 2012, A report on enhancement of durability conveyor belt, Munich, GRIN Verlag, https://www.grin.com/document/211489
