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Papers by Niroshan Senavirathne

Wills' Mineral Processing Technology, 2005

This chapter presents the dense medium separation, which is applied to the pre-concentration of m... more This chapter presents the dense medium separation, which is applied to the pre-concentration of minerals that is the rejection of gangue prior to grinding for final liberation. It is also known as heavy medium separation or the sink-and-float process. It is also used in coal preparation to produce a commercially graded end-product and clean coal being separated from the heavier shale or high-ash coal. In principle, it is the simplest of all gravity processes and has long been a standard laboratory method for separating minerals of different specific gravity. Heavy liquids of suitable density are used so that the minerals lighter than the liquid float while the minerals denser than the liquid sink. Pre-concentration is most often performed on metalliferous ores that are associated with relatively light country rock. Thus, finely disseminated galena and sphalerite often occur with pyrite as replacement deposits in rocks such as limestone or dolomite. The chapter explains various kinds of denser medium such as liquids, suspensions, and separating vessels. Several types of separating vessel are in use and may be classified into gravitational and centrifugal vessels. The chapter also describes the performances and efficiencies of different types of denser medium separators. The chapter explains the partition curves for an operating dense medium vessel by sampling the sink and float products and performing heavy liquid tests to determine the amount of material in each density fraction. The results of heavy liquid tests on samples of floats and sinks from a vessel separating coal from shale are shown in the chapter.

Sri Lankan iron industry dates far back to the history and it was the origin of the iron metal wh... more Sri Lankan iron industry dates far back to the history and it was the origin of the iron metal which used in the production of famous "Damascas Swards". This report reviews on the iron ore deposits of Sri Lanka and proposes a suitable method for the extraction.

The report reviews on the mineralogical gravity separation techniques and their potential in the ... more The report reviews on the mineralogical gravity separation techniques and their potential in the Sri Lankan mineral industry.

Seminar Report on Quartz Mineral and the Vein Quartz Deposits of Sri Lanaka.

A project plan on initiating a quartz processing business using Sri Lankan vein quartz deposits ... more A project plan on initiating a quartz processing business using Sri Lankan vein quartz deposits and analysis on potential barriers.

The most controversial and the most recently discussed matter between the country’s professionals... more The most controversial and the most recently discussed matter between the country’s professionals and the government of Sri Lanka is the ETCA agreement, which will be signed with INDIA. As per the government sources the framework of this agreement will be signed in the December, 2016. Amidst the situation that a proper draft has not been issued to the public, many do concern about the conditions and the sentences which may include in the agreement.

Management is doing things right. Leadership is doing right things.

Leadership is not Management or Directing. Leadership is the ability to inspire or influence othe... more Leadership is not Management or Directing. Leadership is the ability to inspire or influence others towards the leader's goal. Leaders have followers. If someone has followers, he or she is a leader. Although there are many more definitions on Leadership, simply leadership now Leadership is intentional influence. There were and there are many leaders in the world. They all were practicing novel and specific “Traits and Behaviors”, to fulfill their role. This report will analyse the significant features of them.

An analysis on Sri Lankan free education system and the inability to achieve the desired success ... more An analysis on Sri Lankan free education system and the inability to achieve the desired success of it as a nation.

Analysis of various socialization patterns depicted in the BBC Documentary film "The Human Planet"

Other by Niroshan Senavirathne

Sri Lanka is a country enriched with massive mineral deposits which has been more diversified. As... more Sri Lanka is a country enriched with massive mineral deposits which has been more diversified. As a country, we do export our valuable mineral deposits just as raw materials of the high-tech industries. This leads to a huge loss in the revenue base of the country, since we have the potential to enhance those using novel technologies and go for a higher income. At this point our attention has to be focused unto the “Nano technology”, which is becoming the modern world trend of novel technologies. Nano technology will lead us to a modern era of usage of Sri Lankan minerals, which will create a huge economy throughout the world.

Aerial photography is -as it sounds -the process of taking photographs from the air. There is mor... more Aerial photography is -as it sounds -the process of taking photographs from the air. There is more to it than simply using a light aircraft or helicopter and flying up to take photographs. Aerial photographs are taken in two basic forms and both have different uses and applications: oblique and vertical. However, some landscape types are difficult to access on foot so aerial photographs are vital to study and map them.

The trending value addition has been an essential in the modern world. this consists a real world... more The trending value addition has been an essential in the modern world. this consists a real world analysis in value added, using a case study done in Canada and applying it to the Sri Lankan arena.

Dense Medium Separation method is a Mineral Processing Method, which is being used to separate th... more Dense Medium Separation method is a Mineral Processing Method, which is being used to separate the ore samples into a series of fractions according to density, establishing the relationship between the high and the low specific gravity minerals.

Drafts by Niroshan Senavirathne

" Rasashastra " is the branch of Ayurveda which deals with metals and minerals related pharmacolo... more " Rasashastra " is the branch of Ayurveda which deals with metals and minerals related pharmacology. The ayurvedic drugs affiliate with mineral, metallic preparations are called " Rasaushadhies ". Due to innate qualities like quick action, lesser dose, tastelessness, prolonged shelf life, better palatability, the drugs derive from rasaushadhies i.e-" bhasmas " are becoming more popular. The traditional ayurvedic non-toxication process of these metals and minerals comprise of mainly 3 processes called Shodhana (bio purification), Jarana (roasting) and Marana (incineration/calcination), including Puta (heating) systems. During these processes toxic heavy metals and minerals subjected to changes in their particle size, structure and chemistry and further, toxicity decays. The minerals which are being used in these rasaushadhie preparations undergo many physical and chemical changes, during the preparation methods. Many researches have been conducted to study the changes happen in these mineral formulations. This paper reviews the general physico-chemical changes which occur during these rasaushadhie preparations. The studies were searched in the database of Directory of Open Access Journals, under the key words rasaushadhies, bhasma and physico-chemical studies. The studies which followed modern analytical procedures and techniques such as XRF, XRD, SEM, TGA, ICP-MS etc. were selected. In these studies, the transformations of minerals during the rasaushadhie preparations were clearly identified based on most common rasaushadhies like vanga, vaikrantha, yashada, naag, parada and sagandha bhasmas. The changes were identified in physico-chemical parameters like color, odor, weight change, particle size, chemical composition, crystal structure etc. The minerals undergo common physico-chemical changes while the preparations proceed, regardless of the type of mineral being used and the type of bhasma. Changes occur in between the procedures depend on the type of bhasma being prepared. Physical qualities of all the bhasmas are similar except in the color of Yashada bhasma. Identification of changes occurs in minerals and other constituents during these preparations is helpful in artificial synthesis of medicines of same functional capacity. And to use minerals in biological purposes by reducing their natural toxicity.

Wills' Mineral Processing Technology, 2005

This chapter presents the dense medium separation, which is applied to the pre-concentration of m... more This chapter presents the dense medium separation, which is applied to the pre-concentration of minerals that is the rejection of gangue prior to grinding for final liberation. It is also known as heavy medium separation or the sink-and-float process. It is also used in coal preparation to produce a commercially graded end-product and clean coal being separated from the heavier shale or high-ash coal. In principle, it is the simplest of all gravity processes and has long been a standard laboratory method for separating minerals of different specific gravity. Heavy liquids of suitable density are used so that the minerals lighter than the liquid float while the minerals denser than the liquid sink. Pre-concentration is most often performed on metalliferous ores that are associated with relatively light country rock. Thus, finely disseminated galena and sphalerite often occur with pyrite as replacement deposits in rocks such as limestone or dolomite. The chapter explains various kinds of denser medium such as liquids, suspensions, and separating vessels. Several types of separating vessel are in use and may be classified into gravitational and centrifugal vessels. The chapter also describes the performances and efficiencies of different types of denser medium separators. The chapter explains the partition curves for an operating dense medium vessel by sampling the sink and float products and performing heavy liquid tests to determine the amount of material in each density fraction. The results of heavy liquid tests on samples of floats and sinks from a vessel separating coal from shale are shown in the chapter.

Sri Lankan iron industry dates far back to the history and it was the origin of the iron metal wh... more Sri Lankan iron industry dates far back to the history and it was the origin of the iron metal which used in the production of famous "Damascas Swards". This report reviews on the iron ore deposits of Sri Lanka and proposes a suitable method for the extraction.

The report reviews on the mineralogical gravity separation techniques and their potential in the ... more The report reviews on the mineralogical gravity separation techniques and their potential in the Sri Lankan mineral industry.

Seminar Report on Quartz Mineral and the Vein Quartz Deposits of Sri Lanaka.

A project plan on initiating a quartz processing business using Sri Lankan vein quartz deposits ... more A project plan on initiating a quartz processing business using Sri Lankan vein quartz deposits and analysis on potential barriers.

The most controversial and the most recently discussed matter between the country’s professionals... more The most controversial and the most recently discussed matter between the country’s professionals and the government of Sri Lanka is the ETCA agreement, which will be signed with INDIA. As per the government sources the framework of this agreement will be signed in the December, 2016. Amidst the situation that a proper draft has not been issued to the public, many do concern about the conditions and the sentences which may include in the agreement.

Management is doing things right. Leadership is doing right things.

Leadership is not Management or Directing. Leadership is the ability to inspire or influence othe... more Leadership is not Management or Directing. Leadership is the ability to inspire or influence others towards the leader's goal. Leaders have followers. If someone has followers, he or she is a leader. Although there are many more definitions on Leadership, simply leadership now Leadership is intentional influence. There were and there are many leaders in the world. They all were practicing novel and specific “Traits and Behaviors”, to fulfill their role. This report will analyse the significant features of them.

An analysis on Sri Lankan free education system and the inability to achieve the desired success ... more An analysis on Sri Lankan free education system and the inability to achieve the desired success of it as a nation.

Analysis of various socialization patterns depicted in the BBC Documentary film "The Human Planet"

Sri Lanka is a country enriched with massive mineral deposits which has been more diversified. As... more Sri Lanka is a country enriched with massive mineral deposits which has been more diversified. As a country, we do export our valuable mineral deposits just as raw materials of the high-tech industries. This leads to a huge loss in the revenue base of the country, since we have the potential to enhance those using novel technologies and go for a higher income. At this point our attention has to be focused unto the “Nano technology”, which is becoming the modern world trend of novel technologies. Nano technology will lead us to a modern era of usage of Sri Lankan minerals, which will create a huge economy throughout the world.

Aerial photography is -as it sounds -the process of taking photographs from the air. There is mor... more Aerial photography is -as it sounds -the process of taking photographs from the air. There is more to it than simply using a light aircraft or helicopter and flying up to take photographs. Aerial photographs are taken in two basic forms and both have different uses and applications: oblique and vertical. However, some landscape types are difficult to access on foot so aerial photographs are vital to study and map them.

The trending value addition has been an essential in the modern world. this consists a real world... more The trending value addition has been an essential in the modern world. this consists a real world analysis in value added, using a case study done in Canada and applying it to the Sri Lankan arena.

Dense Medium Separation method is a Mineral Processing Method, which is being used to separate th... more Dense Medium Separation method is a Mineral Processing Method, which is being used to separate the ore samples into a series of fractions according to density, establishing the relationship between the high and the low specific gravity minerals.

" Rasashastra " is the branch of Ayurveda which deals with metals and minerals related pharmacolo... more " Rasashastra " is the branch of Ayurveda which deals with metals and minerals related pharmacology. The ayurvedic drugs affiliate with mineral, metallic preparations are called " Rasaushadhies ". Due to innate qualities like quick action, lesser dose, tastelessness, prolonged shelf life, better palatability, the drugs derive from rasaushadhies i.e-" bhasmas " are becoming more popular. The traditional ayurvedic non-toxication process of these metals and minerals comprise of mainly 3 processes called Shodhana (bio purification), Jarana (roasting) and Marana (incineration/calcination), including Puta (heating) systems. During these processes toxic heavy metals and minerals subjected to changes in their particle size, structure and chemistry and further, toxicity decays. The minerals which are being used in these rasaushadhie preparations undergo many physical and chemical changes, during the preparation methods. Many researches have been conducted to study the changes happen in these mineral formulations. This paper reviews the general physico-chemical changes which occur during these rasaushadhie preparations. The studies were searched in the database of Directory of Open Access Journals, under the key words rasaushadhies, bhasma and physico-chemical studies. The studies which followed modern analytical procedures and techniques such as XRF, XRD, SEM, TGA, ICP-MS etc. were selected. In these studies, the transformations of minerals during the rasaushadhie preparations were clearly identified based on most common rasaushadhies like vanga, vaikrantha, yashada, naag, parada and sagandha bhasmas. The changes were identified in physico-chemical parameters like color, odor, weight change, particle size, chemical composition, crystal structure etc. The minerals undergo common physico-chemical changes while the preparations proceed, regardless of the type of mineral being used and the type of bhasma. Changes occur in between the procedures depend on the type of bhasma being prepared. Physical qualities of all the bhasmas are similar except in the color of Yashada bhasma. Identification of changes occurs in minerals and other constituents during these preparations is helpful in artificial synthesis of medicines of same functional capacity. And to use minerals in biological purposes by reducing their natural toxicity.