This document summarizes a seminar presentation on monolithic refractories. It discusses the introduction and history of monolithic and moldable refractories. It describes the types of moldable refractories based on setting and form. It covers the raw materials, particle size distribution, binders, additives and their roles in moldable refractories. It provides details on the typical specifications and properties of moldable refractories. Finally, it discusses the applications of moldable refractories in iron and steel, aluminum and other industries.
classification of refractories and commonly used refractory brickssunrise refractory
Refractories act as a thermal barrier between a hot medium and the wall of the containing vessel, represent a chemical protective barrier against corrosion, ensure a physical protection, prevent the erosion of walls by the circulating hot medium and act as thermal insulation for heat retention.
CEMENT , TYPES OF CEMENTS , PORTLAND CEMENT
TYPES OF PORTLAND CEMENT, GENERAL FEATURES OF THE MAIN TYPES OF PORTLAND CEMENT, ORDINARY PORTLAND CEMENT (OPC), RAPID HARDENING PORTLAND CEMENT, SPECIAL TYPES OF RAPID HARDENING PORTLAND CEMENT, MANUFACTURE OF PORTLAND CEMENT, Raw Materials, Crushing & Grinding of Raw Materials,Type of cement processes, Wet Process, Dry process, Burning Process, Grinding, storage, packing, dispatch,CEMENT CHEMISTRY,Chemical Compositions,Bogue’s Equations, Fineness of cement
TMT Bar should have the perfect combination of Strength and Flexibility. Otherwise it is not recommended for all type of construction purposes. Strength of TMT Bar enables load bearing capacity where Ductility helps to bend as per construction requirement also protect the buildings during an Earthquake.
RESIDUAL COMPRESSIVE STRENGTH OF TERNARY BLENDED CONCRETE AT ELEVATED TEMPERA...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in the concrete manifests in the form of cracking and
spalling of the concrete surface.
classification of refractories and commonly used refractory brickssunrise refractory
Refractories act as a thermal barrier between a hot medium and the wall of the containing vessel, represent a chemical protective barrier against corrosion, ensure a physical protection, prevent the erosion of walls by the circulating hot medium and act as thermal insulation for heat retention.
CEMENT , TYPES OF CEMENTS , PORTLAND CEMENT
TYPES OF PORTLAND CEMENT, GENERAL FEATURES OF THE MAIN TYPES OF PORTLAND CEMENT, ORDINARY PORTLAND CEMENT (OPC), RAPID HARDENING PORTLAND CEMENT, SPECIAL TYPES OF RAPID HARDENING PORTLAND CEMENT, MANUFACTURE OF PORTLAND CEMENT, Raw Materials, Crushing & Grinding of Raw Materials,Type of cement processes, Wet Process, Dry process, Burning Process, Grinding, storage, packing, dispatch,CEMENT CHEMISTRY,Chemical Compositions,Bogue’s Equations, Fineness of cement
TMT Bar should have the perfect combination of Strength and Flexibility. Otherwise it is not recommended for all type of construction purposes. Strength of TMT Bar enables load bearing capacity where Ductility helps to bend as per construction requirement also protect the buildings during an Earthquake.
RESIDUAL COMPRESSIVE STRENGTH OF TERNARY BLENDED CONCRETE AT ELEVATED TEMPERA...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in the concrete manifests in the form of cracking and
spalling of the concrete surface.
I hope You all like it. I hope It is very beneficial for you all. I really thought that you all get enough knowledge from this presentation. This presentation is about materials and their classifications. After you read this presentation you knowledge is not as before.
REFRATHERM® Eco High-End Insulation for the Tunnel Kiln CarRefratechnik Group
For more than 50 years, Refratechnik has carried out research and development in the field of biogenic silica. First experiences in thermal processes have led to a continuous expansion of know-how and our own production of the material. The thermal insulating properties have been further developed and specialised for today’s applications.
The development of the special insulation REFRATHERM® Eco for use in the heavy clay industry opens up convincing new applications.
Canada Metal: Lead sheet metal for nuclear shielding, Constructioncanadametal
Canada Metal supplies lead sheet metal for multiple purposes like radiation shielding, nuclear shielding or construction and many more uses. Canada Metal provides high quality sheet lead with many type of thickness on cost effective range. http://www.canadametal.com/products/lead/sheet-lead/
Use of Sheet Lead as the Protective Shieldingcanadametal
Sheet lead can be used for the different purposes in the applications like roofing & flashing, waterproofing, noise control, and protective radiation shielding. The typical uses of radiation shielding includes space shielding, mobile lead screen, lead shielded containers, and nuclear reactor shielding. For more information, contact to the Canada Metal North America.
Visit: http://www.canadametal.com/products/lead/sheet-lead/
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
1. Seminar and Technical Writing September 2021
Presented By: Arthita Bhattacharyya
Roll No: 919CR5008
Faculty Advisor: Dr. Debasish Sarkar
Department of Ceramic Engineering
2. Introduction
Monolithic Refractory
Types of Monolithic Refractories
History of Moldable Refractory
Types of Moldable Refractory
Pros & Cons of Moldable Refractory
Raw Materials
Particle Size Distribution
Binders and Additives
Role of different Binders
Typical Specification of Moldable Refractory
Application of Moldable Refractory
3. Moldable plastic refractories have found wide acceptance in India
as furnace linings in steel, aluminum, power and petrochemical
industries in the last 20-25 years.
It is especially adaptable for making quick, economical emergency
repairs due to their short setting time and good thermo-
mechanical properties in wide temperature range.
Moldable refractory consisting of moistened aggregates is usually
rammed into place with an air & electric hammer.
They can also be applied via gunning, resulting high installation
rate over the traditional ramming method.
4. From the simple beginning in the early 1900’s, monolithic
refractory have evolved world-wide over the succeeding 100 years.
With various modifications, its performance and cost effectiveness
now is at par with or superior to pre-fired refractory bricks.
The success of monolithics has been due to significant advances
in the type and quality of binders, additives, quality and particle
size distribution of aggregates.
Monolithic products are now designed for all installation methods
from traditional to cutting-edge, fully adapted to the specific
conditions.
5. Depending on the installation techniques monolithics are divided
in to different categories:
Castable refractories
Gunning materials
Spraycast / shotcrete products
Refractory plastic / Moldable
Ramming mixes
Patch products
Large
Aggregates
Fine
Fillers
Binder &
Additives
Monolithic
Formulatio
n
6. The first plastic refractory were simple mixtures of plastic clay and
crushed-brick grog or calcined clay furnished in a wet, moldable
form.
1920 -1940 1940 -1960 1960 -1990 1990 - 2018
1. Semi-baked, putty like
plastic firebrick.
2. Clay based plastic
refractory.
3. Phosphate bonded &
graphitic plastic.
4. Different application
technique, Advances in
additives, binders and
PSDs.
1. Introduced in boilers.
2. Different application
techniques were
adopted.
1. Experimentation with
different binders.
2. Different application
techniques were
adopted.
3. Gunning in roof of
walking beam
furnace.
7. Based on setting:
Heat - set - forms a bond when placed and heated to about 500 C.
Air- set- contains aluminum sulfate which forms a crust as the refractory
dries.
Chemically Bonded - contains phosphoric acid or an acid phosphate
which reacts with the alumina in the composition.
Based on Form:
Granular form- These are prepared at the proper consistency in moist
granular form, ready to use by gunning or ramming.
Extruded form- The extruded blocks are sliced into pieces and are
rammed or poured into place with pneumatic rammer during application.
8. Pros:
Easy Installation at the
intricate areas in furnace,
Less labour intensive,
Light Weight,
Fast dry-out and heat-up with
no need for curing or long
setting times,
Good repair properties due to
the ability to bond to existing
fired refractory,
Good thermo-mechanical
properties,
Excellent thermal shock
properties.
Cons:
Susceptible to compaction
during storage,
Low workability of single
component material,
Occurrence of lamination in
lining when installed by
ramming.
9. Alumina is the major constituent of the total composition.
The major sources of alumina are calcined bauxite, calcined
alumina, brown fused alumina, aluminum silicates such as
kyanite, mullite and china clay.
Advantages of Mullite in place of BFA & Andalusite:
1. Mullite is a good, low cost refractory with interlocking grain structure.
2. It does not react with colloidal silica at room temperature.
3. It has little drying shrinkage and cracking tendency.
4. It shows high strength and high volume stability at high temperatures.
5. It has high thermal shock resistance owing to the low thermal expansion.
Disadvantages of Clay:
P2O5 sources react with impurities in the clay to form precipitates which destroy
the shelf life of the plastic refractory.
10. 0-0.1
0.1-1
1-3
3-5
0 10 20 30 40 50 60
Size
Range
(mm)
%
Particle Size Distribution
Moldable Ref-III
Moldable Ref-II
Moldable Ref-I
O-1 mm dominates the particle size distribution in
moldable plastic refractory
11. Impart strength & adherence.
Evenly distributed in the refractory
matrix during mixing.
Due to its acidic properties It reacts
with alumina containing raw materials
at low temperatures.
On heating additional bonding occurs
due to formation of polymeric
phosphates.
The phosphate bond persists until the
ceramic bond comes into effect.
Chemical Binder
• Ortho Phosphoric Acid
• Mono Aluminium Phosphate
Organic Binder
• Carboxy Mithyl Cellylose
It serves as a plasticizer and a
lubricant to enhance thixotropic
properties.
Helps to achieve slump
resistance in the refracttory.
Acts as a gelling agent for
colloidal silica.
12. Sol-Gel Binder
• Colloidal Silica
Deflocculating Agent
• Sodium Hexa Meta Phosphate
Thixotropic agent and plasticizer.
The water based colloid surrounds the
refractory particles during mixing.
During drying, the hydroxyl groups
(Si-OH) on the surface of the particles
generate siloxane bonds (Si-O-Si)
which results in a three dimensional
network known as gelling.
Gelling forms a network encapsulating
the refractory particles providing
mechanical strength to the system
after drying.
It helps to disperse the colloidal
particulate material component
of the binder and prevent
agglomeration.
13. Ortho
Phosphoric
acid
• Ortho Phosphoric Acid is
used as binder due to its
ability to provide low
temperature chemical
bonding.
• Its Lower vapour pressure
reduces stresses within a
refractory lining during heat
up and improves heat up
properties.
• Reduces drying time as the
release of moisture is
quicker.
• Creates chemical bond with
existing cement bonded
castable lining as
phosphoric acid reacts with
CaO at ambient
temperatures.
Mono
Aluminium
Phosphate
• It is prepared by the
reaction between Alumina
and phosphoric acid.
• It also provides low
temperature chemical
bonding with its
conversion to poly-
phosphate and meta-
phosphate during the heat
up.
• It has improved strength
and binding ability than
ortho phosphoric acid.
• The release of water during
drying is considerably
slower than ortho-
phosphoric acid.
Colloidal
Silica
• Provides highly permeable
structure, allows easy drying,
reduces cracks and explosive
spalling.
• Nano sized colloidal silica
particles promotes solid phase
sintering and mullite formation.
• less mixing time,
• easier installation,
• better corrosion and oxidation
resistance,
• better refractoriness,
• improved lining life and longer
shelf-life.
• Reduces phosphate migration in
the refractory mix after it is
heated to cure.
Colloidal silica bonded
refractory shows very low
strength below its sintering
temperature (1100 C).
It is stable at a pH of 2.7 to 3.1
or 9.0 to 9.8 and outside these
ranges, it becomes gelled and
lose thixotropy.
Migration of phosphates into the lining after the installation results
in disruption of the moulded refractory bodies by disintegration
and macroscopic cracking.
14. Components Range (%)
Al2O3 50 - 97
SiO2 47- 2.1
Fe2O3 1.2 – 0.1
TiO2 1.5 – 2.5
CaO 0.1
Alkalies 0.1
Chemistry :
Based on the application requirement moldable refractories are
manufactured with varying chemistry.
Being a Al2O3 based material the Al2O3 content may vary from 50
to more than 90% to meet the desired physical properties.
15. Physical Properties 50% Al2O3 based 90% Al2O3 based
Service Temp
(Max, °F)
3000 3300
Bulk Density
(Rammed, lbs./cu.ft)
140 - 150 181 - 187
Cold Crushing Strength
(After Heating to 1500°F, lbs/sq.in)
1200-1500 3500-6000
Modulus of Rupture
(After Heating to 1500°F, lbs/sq.in)
150-200 700-1100
Linear Change,
(After Heating to 1500°F, %)
0.0 to –0.2 -0.1 to - 0.4
Physical Properties :
Raw materials, recipe, granulometry, binders and additives play important
roles to achieve desired physical properties.
Typical physical properties are tabulated below for 50% and 90% Al2O3
based moldable refractory.