Aluminum recovery from coal fly ash by high temperature chlorination

Wijatno, Hendra

doi:10.2172/5205054

Cited by 13 publications

(14 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Salah satu bentuk pemberdayaan bagi masyarakat pemulung yang dapat dilakukan adalah peberian pemahaman dan penumbuhan jiwa entrepreneurship. Wijatno (2009:2) mendefenisikan entrepreneurship sebagai aktivitas untuk menciptakan sesuatu yang baru. Sedangkan (Hendro, 2011:30) menjelaskan bahwa entrepreneurship adalah suatu kemampuan untuk mengelola sesuatu yang ada dalam diri anda untuk dimanfaatkan dan ditingkatkan agar lebih optimal (baik) sehingga bisa meningkatkan taraf hidup anda di masa mendatang.…”

Section: Pendahuluanunclassified

Kajian Potensi Wirausaha Komunitas Pemulung Tpa Air Dingin Kota Padang

2018

ECONOMICA

View full text Add to dashboard Cite

ABSTRAC ABSTRAKMakalah ini merupakan hasil kajian tentang potensi entrepreneurship yang dimiliki oleh komunitas pemulung dalam upaya meningkatkan kesejahteraan hidup. Penelitian ini merupakan penelitian kualitatif. Pendekatan analisis yang digunakan adalah pendekatan analisis deskriptif, yaitu penelitian yang tujuannya untuk menguraikan, menerangkan atau menjelaskan secara mendalam tentang variabel tertentu yang ada dalam suatu masyarakat. Pengumpulan data menggunakan metode observasi, wawancara, dokumentasi. Teknik pemilihan informan menggunakan purposive sampling. Informan dalam penelitian ini adalah komunitas pemulung yang berada di sekitar Tempat Pembuangan Akhir (TPA) Air Dingin Kota Padang. Teknik menjamin keabsahan data mengacu kepada penggunaan standard dari Lincoln dan Guba yaitu credibility, transferability, dependability, confirmability. Hasil temuan dilapangan menunjukan bahwa sebagian besar pemulung merupakan ibu-ibu rumah tangga yang tidak memiliki keahlian dan keterampilan, tetapi memiliki semangat untuk berusaha mendapatkan hasil pulungan yang dapat dijual kepada agen atau pengepul. Jiwa entrepreneur yang mereka miliki masih pasif, mereka hanya mengikuti kebiasaan yang telah ada yaitu menjual semua hasil pulungannya, seandainya mereka melakukan sedikit inovasi terhadap hasil pulungan seperti mengolah sampah plastik menjadi aneka kreasi yang unik dan menarik maka nilai jualnya akan meningkat yang berarti mereka akan mendapatkan income tambahan. Untuk itu diperlukan kajian berikutnya tentang pemahaman entrepreneur dan kajian jenis ketrampilan yang sesuai bagi komunitas pemulung dalam mengolah hasil pulungan yang memiliki nilai tambah.

show abstract

Section: Pendahuluanunclassified

Kajian Potensi Wirausaha Komunitas Pemulung Tpa Air Dingin Kota Padang

2018

ECONOMICA

View full text Add to dashboard Cite

show abstract

“…Kata entrepreneur (Wijatno, 2009: 2) berasal dari bahasa Prancis, entre berarti antara, dan pendre berarti mengambil. Kata ini pada dasarnya untuk menggambarkan orang-orang yang berani mengambil resiko dan memulai sesuatu yang baru.…”

Section: Sosok Entrepreneur a Konsep Entrepreneurunclassified

Berpikir Kreatif Dan Inovatif Dalam Membangun Jiwa Entrepreneur

Jumari¹

2017

View full text Add to dashboard Cite

This article examines the creative and innovative thinking in building the entrepreneurial spirit. With the creative and innovative thinking are the human thought process undertaken to develop themselves, especially in building the entrepreneurial spirit. The figure of the entrepreneur as the ideals of human independence in trying to provide support in realizing the nation's progress. Evidence that the entrepreneur is able to realize the nation's progress is the existence in the face of obstacles and challenges as well as creative and innovative thinking so that the obstacles and challenges are not an obstacle to success, but rather as an opportunity. Creative and innovative thinking to try to reverse the mindset that tends to be negative into a positive. The assumption that appear in the form of strong beliefs to himself by maximizing the grace to think the Lord gave humans.

show abstract

“…ERDA and DOE financed research at the Ames Lab oratory, Energy and Minerals Resources Research Insti tute, Iowa State University, on the extraction of alumina from coal ash that resulted in several reports (Cavin, 1974;Chou, 1976;Chou and others, 1976;Murtha and Burnet, 1976Burnet, 1977;Burnet and others, 1977Burnet and others, , 1983Burnet and others, , 1984Wijatno, 1977) described in the section titled "Investigations by U.S. Colleges and Universities.…”

Section: Us Department Of Energymentioning

confidence: 99%

“…Cavin (1974) extracted alumina from the nonmag netic fraction of powerplant fly ash by first sintering it with limestone, then leaching it with sulfuric acid. Other research was described by Chou (1976), Chou and others (1976), Murtha and Burnet (1976, Burnet (1977), and Wijatno (1977). Burnet andothers (1983, 1984) prepared a bibliography on the recovery of metals from coal ash.…”

Section: Investigations By Us Colleges and Universitiesmentioning

confidence: 99%

World nonbauxite aluminum resources excluding alunite

Hosterman¹,

Patterson²,

Good³

1990

Professional Paper

View full text Add to dashboard Cite

The nonbauxite resources having the best potential for extraction of aluminum are alunite, high-alumina clay, and aluminous igneous rocks; those having less potential are dawsonite-bearing rocks, aluminous phosphate rocks, saprolite, aluminous metamorphic rocks, aluminous shale, coal waste, and coal ash. With the exception of alunite, which was discussed in the separately published Chapter A of this Profes sional Paper, all these resources are discussed in this report. The high-alumina clays are composed of minerals of the kaolin group-kaolinite, halloysite, dickite, and nacrite. Kaolinite is by far the most abundant, and it is the major component in a variety of highalumina clays. High-alumina clays have a maximum alumina content of about 39 weight percent. However, no large deposits are pure, and most high-alumina clay deposits are 25-35 weight percent alumina. Igneous rocks exceptionally rich in alumina include anorthosite, nepheline syenite, phonolite, and leucite-bearing volcanic rocks. U.S. anorthosite contains 24-33 weight percent alumina, U.S. nepheline syenite contains 17-23 weight percent alumina, and Italian leucitebearing rocks contain 20-22 weight percent alumina. The mineral dawsonite, which contains 35.4 weight percent alumina, occurs in oil shale but makes up no more than 12-25 weight percent of the rock. Therefore, any aluminum production from dawsonite must depend upon other products from the shale such as oil and soda ash derived from nahcolite. The aluminous phosphate rock associated with phosphate deposits is the result of calcium phosphate being leached by meteoric waters. The alumina content of such phosphate rock in the United States ranges from about 6 to 15 weight percent, and the aluminum phosphate minerals make up 20-30 weight percent of the rock. Any aluminum production from this rock will depend on the recovery of other products such as phosphate and uranium. The Thies region, Senegal, is the only place in the world where significant tonnages of aluminum phosphate are mined. Saprolite is a decomposed rock formed in place by subaerial chemical weathering of any kind of rock; it retains the original structure and texture of the parent rock. Some saprolite is similar in chemical and mineral composition to high-alumina clay, and some saprolite contains gibbsite replacing kaolinite. Generally, saprolite that is a potential resource of alumina contains 20-38 weight percent alumina. Aluminous metamorphic rocks contain the minerals kyanite, sillimanite, andalusite, topaz, or dumortierite. These minerals contain 55-64 Manuscript approved for publication, November 3, 1989. weight percent alumina. Aluminous metamorphic rocks may contain as much as 40 weight percent kyanite-group minerals, but generally they contain less than 15 weight percent. Aluminous shales are sedimentary rocks formed by the consolidation of clay-and silt-sized material. Almost all shales contain some quartz and the clay minerals illite, kaolinite, and (or) smectite. The alumina content of shale that is a potential resource...

show abstract

Aluminum recovery from coal fly ash by high temperature chlorination

Cited by 13 publications

References 7 publications

Kajian Potensi Wirausaha Komunitas Pemulung Tpa Air Dingin Kota Padang

Kajian Potensi Wirausaha Komunitas Pemulung Tpa Air Dingin Kota Padang

Berpikir Kreatif Dan Inovatif Dalam Membangun Jiwa Entrepreneur

World nonbauxite aluminum resources excluding alunite

Contact Info

Product

Resources

About