Essay on Acid Leaching Is The Process Of Reacting Unwanted Minerals On The Gas

Essay on Acid Leaching Is The Process Of Reacting Unwanted Minerals On The Gas

Length: 1646 words (4.7 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

Acid leaching is the process of reacting unwanted minerals on the coal with the aqueous acid solution in order to create removable salts in an aqueous setting. This leaching, with certain Acids, is unable and can rarely remove the organic sulfur. For example, a solution of 15% Hydrogen peroxide alone was able to remove 70% sulfur sulfate, 76% pyritic sulfur, 5% organic sulfur and 14% ash at 25˚C (Meshram, Purohit, 2015). However, by adding 0.1 mol/L Sulfuric Acid to act as a catalyst, almost all of the sulfur sulfate and pyritic sulfur, 43% of the ash, and over 26% of the organic sulfur were removed (Meshram, Purohit, 2015). The catalyst improves the reaction by moving the oxygen and pyrite molecules together so that they may react easier. The Acid leaching process often involves two different acid solutions in two different leaches on order to extract to greatest amount of unwanted minerals. Figure 3 shows a two-step process, Hydrogen fluoride leach followed by a Nitric acid leach, attempted in various different experiments involving multiple types of coal with various ash and sulfur weight percentages. The results from the experiments vary but all show a large decrease in the weight percentage of ash and sulfur.

The combination of the two proves as an effective method of desulfurizing coal as leaching with an alkali will create hydrated alkali-bearing silicate, alumina-silicate complexes (Groppo, Parekh, 2000). These complexes can be manipulated to react with acids to produce effective results.

The bio-processing of coal is an emerging technology with two primary aims: the cleaning of coal through microbial processes and coal conversion (Meshram, Purohit, 2015). Coal is decayed plant or animal matter that has been altered by...


... middle of paper ...


...thods are able to remove inorganic sulfur cost effectively and efficiently, while the chemical method is able to remove the organic sulfur effectively. The majority of coal processing plants use physical methods followed by a flue gas desulfurization with wet scrubbers, because this has proved to be cost efficient but it creates a large amount of toxic waste due to the wet scrubbers. The recommended method of the desulfurization of coal from this analysis is a combination of physical methods, followed by a chemical process, in order to maximize removal of sulfur. Using this method will also be within the regulations of 150 parts per million, and will be ecologically positive (Meshram, Purohit, 2015). The regulations are always becoming stricter regarding the amount of emissions allowed and this method will be the most effective in following the future regulations.



Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Diamonds - Creation Process & Uses Essay

- Diamonds can be created through both geologic forces and man-made processes. However they are made diamonds have many uses. In the first part of this essay we will look at the geologic forces involved in the making of a diamond. Next we will examine the man-made processes. In closing we will take a brief look at the many uses of diamonds. As we begin to look at how diamonds are formed it’s important to understand a little about the composition. Graphite which is used for pencil lead and a lubricant is pure carbon just like a diamond....   [tags: minerals, geology, temperature, mantle, eruption]

Better Essays
1098 words (3.1 pages)

Air Pollution and Acid Rain Essays

- Air Pollution is not a new topic. It is a problem that we have noticed since the industrial revolution, when trees, houses and cars were covered in soot from the factories. People demanded change then, just as they are demanding it now. With all the talk of acid rain, global warming and ozone depletion it seems hopeless, but it isn't. Everyone can make a difference. After reading this you will understand the causes, effects and possible solutions to the problems of acid rain, global warming and ozone depletion....   [tags: Environment, Environmental Issues]

Better Essays
1295 words (3.7 pages)

Essay on Acid Rain

- Acid rain Rain is a major component of the water cycle and holds responsibility for depositing most of the fresh water on Earth. (EPA USA, 2014) It is the provider behind suitable conditions for various ecosystems, as well as water for hydroelectric power plants and crop irrigation. (Andrei, 2011) Acid rain, or acid deposition, is a form of precipitation that posses a higher acidity than regular rain. (Seinfeld & Pandis, 1998) Acid deposition also includes other forms such as snow, sleet, hail, and fog (or cloud water)....   [tags: pollution, environmental issues]

Better Essays
1098 words (3.1 pages)

History of Acid Mine Drainage in South Africa Essay

- The history and beginning of increased acid mine drainage: Mining has been a cornerstone of South Africa’s economy. It was the basis for which one of its main cities, Johannesburg, was built around. Today, gold mining in the Witwatersrand basin has been one of the main contributing factors to mining in South Africa. An estimated 98% of all gold mined in South Africa has been mined from the Witwatersrand basin. South Africa’s total mining reserves have an estimated worth of R20. 3-trillion, giving South Africa the fifth largest mining sector pertaining to GDP worldwide....   [tags: water, ecological, pollution]

Better Essays
1347 words (3.8 pages)

Essay on Acid Rain

- ABSTRACT This report involves a well description on acid rain as well as a focus on acid rain in eastern Canada. This report contains a very helpful basic background on acid rain as well as a questionnaire. It involves an annual report on the Federal-Provincial Agreements, sulphur dioxide emissions in the seven most eastern provinces, trends in acid deposition in the Atlantic provinces from 1980-1994, as well as acid precipitation in Kejimkujik, Nova Scotia. It also includes data tables, graphs and interesting facts concerning acid rain....   [tags: essays research papers]

Better Essays
3104 words (8.9 pages)

Essay about Understanding Acidic Precipitation or Acid Rain

- Understanding Acidic Precipitation or Acid Rain Our atmosphere functions as living ecosystem of chemical reactions. Through the help of the water cycle, chemicals pass through the atmosphere and are eventually taken up by the soil, surface water, or organic materials. Human beings have added enormously to the atmospheric burden of many toxic substances. The most prominent evidence of this is the presence of acid rain: precipitation and particles that have been made acidic by air pollution. Acid rain is a direct consequence of the atmosphere's self-cleansing process....   [tags: Papers]

Better Essays
504 words (1.4 pages)

Sorption and the Process of Nutrient Cycling Essay

- Sorption is a process that results in the association of a liquid or a gas phase with a solid material. The solid particle that takes up another material is referred to as the sorbent, while the material that is taken up is called the sorbate. When the sorbate adheres to a 2 dimensional surface the process is called adsorption and occurs onto the surface of minerals through van der Waals, dipole-dipole interactions, and electrostatic charges (Hemond and Fechner-Levy, 2000). Absorption occurs into a 3 dimensional surface....   [tags: soil, organic, reactions]

Better Essays
1438 words (4.1 pages)

Acid Rain and Its Harmful Effects on All Forms of Life Essay

- Acid Rain and Its Harmful Effects on All Forms of Life Pollution comes in various forms. Whether it’s toxic waste, CFC’s, or sewage, they are all hazardous, to the earth. These can deplete the earth and it’s inhabitants of resources, causing a harmful change. A product of pollution is acid rain. We shall see that acidification is harmful to all forms of life. Acid rain is any form of precipitation that is polluted by sulphur dioxide (SO2), and nitrogen oxides (NOX). This acid precipitation can be in the form of rain, snow, sleet, fog, or cloud vapors....   [tags: Papers]

Better Essays
974 words (2.8 pages)

Essay on Globalization And Its Impact On Society

- “And God said to them, ‘Be fruitful and multiply and fill the earth and subdue it and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth.’” And so started globalization and industrialization. Except man has taken dominion over all things, both living and nonliving, and our Earth is beginning to see the harmful effects caused by human’s “dominion” as we seek not only to be “fruitful and multiply” but to build and buy the latest gadget while we are at it....   [tags: Greenhouse gas, Carbon dioxide, Oxygen]

Better Essays
1980 words (5.7 pages)

Essay on What is Hydrofracking?

- What is Hydrofracking. Shale rock is sedimentary rock formed some 400 million years ago. Within it the shale rock has something more valuable the most precious gold. In this Marcus shale is natural gas. Natural gas is a large commodity which industries amount to ~$385 billion in the US (“U.S. Natural Gas Benefits”) and supplies millions of homes with energy and heat around the world. Slick water Hydraulic Fracturing, or known as “fracking,” is a process by which natural gas is extracted from shale rock....   [tags: Shale Rock, Sedimentary Rock, Natural Gas]

Better Essays
1436 words (4.1 pages)