scholarly journals Quarry Waste: Chances of a Possible Economic and Environmental Valorisation of the Montorfano and Baveno Granite Disposal Sites

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
G. A. Dino ◽  
M. Fornaro ◽  
A. Trentin
Keyword(s):  
Chemical Analysis ◽  
Field Work ◽  
Raw Material ◽  
Lake District ◽  
Dry Process ◽  
Ore Bodies ◽  
Geophysical Surveys ◽  
Secondary Raw Material ◽  
Granite Samples

The Montorfano and Baveno granite ore bodies are located in the Lake District (VCO-NE Piedmont). They were and are still quarried as dimension stones, with a consequent production of a huge volume of “waste.” In 1995, an Italian company (GMM S.p.A) decided to invest in the valorisation of granite quarry waste as a secondary raw material. An in situ geological prospecting was carried out in order to evaluate the characteristics of the material and the thickness and volume of the useful disposal sites that could be used (by means of geophysical surveys). As a consequence of the field work, the amount of quarry waste was estimated as nearly 2 Mm3. Chemical analysis was carried out on 75 granite samples, in order to individuate the Fe2O3 grade: from 1.321–2.593% of the original waste to 0.160–0.228% after the “dry process” treatment. Three different detailed maps that show the typology, the locations, and the quality distribution of the material in the dumping areas have been drawn up.

scholarly journals Evaluating radiation risks and resource opportunities associated with phosphogypsum in the Philippines

2021 ◽  
Author(s):  
Reymar R. Diwa ◽  
Estrellita U. Tabora ◽  
Botvinnik L. Palattao ◽  
Nils H. Haneklaus ◽  
Edmundo P. Vargas ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Rare Earths ◽  
Acid Production ◽  
The Philippines ◽  
Raw Material ◽  
Surface Samples ◽  
Radiometric Survey ◽  
Activity Concentrations ◽  
Secondary Raw Material

AbstractPhosphogypsum (PG) accumulates during wet-phosphoric acid production for fertilizers. In the Philippines, PG is partly (40%) utilized to produce gypsum walls and cement. This work assesses the radiological risks and resource opportunities associated with PG stacks in the Philippines. The conducted in situ radiometric survey measured the activity concentrations of 40K, 238U, and 232Th at 270 locations. Besides, another 120 surface samples were collected. Pure PG exceeds the recommended radiation limits, but simple dilution with conventional materials can make PG available as an inexpensive secondary raw material for construction. PG further contains relevant concentrations of rare earths and Y (195 ppm).

scholarly journals Kajian Endapan Pasir Besi di Daerah Pantai Selatan Kabupaten Ende, Flores, Provinsi Nusa Tenggara Timur

2006 ◽  
Vol 1 (1) ◽  
pp. 7-15
Author(s):  
Bambang Nugroho Widi ◽  
Kisman Kisman
Keyword(s):  
Chemical Analysis ◽  
Construction Industry ◽  
Field Work ◽  
Laboratory Analysis ◽  
Raw Material ◽  
Physical Laboratory ◽  
Iron Deposits ◽  
Interesting Area

Iron as One of primary raw material in steel and construction industry, it's presence and potencies in Indonesia have an important role. Genetically, known 3 formation of iron deposits (1) Primary, (2) Lateritic, (3) Secondary/reworking process.Based on the survey conducted in Ende in 2005, the typical of iron deposits in this area is classified into sedimentary iron deposits (due to leaching, transporting, accumulating and depositing in somewhere). The accumulation of magnetite grains suggested is due to by leaching, washing in the long term and occurs intensively, so that produce high magnetite concentration in certain area. The interesting area is spread in four sectors; Rapo Rindu, Bheramari, Ruku Ramba and Ondorea sectors.The result of physical laboratory analysis (in concentrate) show the magnetite degree (MD) is vary from 10% to 50%, whereas from chemical analysis known the highest grade reach 37.10% and lowest grade is around 4.4%. However, the everage grade, in general are from 10 to 25 %.The potential of the deposits is obtained from combination between field work laboratory analysis and for those areas mentioned above the total hypothetics resources is 57.134.358,4 ton (concntrate). It seem the deposits of this area is not economic in mining view because very small (under 100 millions tonnes). 

Solid Phase Excitation-Emission Matrix Spectroscopy for In-Situ Chemical Analysis of Combustion Aerosols

2020 ◽  
Author(s):  
Gaurav Mahamuni ◽  
Jiayang He ◽  
Jay Rutherford ◽  
Byron Ockerman ◽  
Edmund Seto ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Cigarette Smoke ◽  
Forest Fires ◽  
Solid Phase ◽  
Incident Angle ◽  
Personal Exposure ◽  
Traffic Emission ◽  
Excitation Emission Matrix ◽  
Internal Excitation

<p>Exposure to combustion generated aerosols such as PM from residential woodburning, forest fires, cigarette smoke, and traffic emission have been linked to adverse health outcomes. It is important to assess the chemical composition of PM to examine personal exposure. Excitation-emission matrix (EEM) spectroscopy has been shown as a sensitive and cost-effective technique for evaluation of combustion PM composition and as a source apportionment tool. However, EEM measurements are hindered by a solvent extraction step and a need for benchtop instrumentation. Here, we present a methodology that eliminates this labor-intensive sample preparation and allows to automate and miniaturize the detection platform. A miniature electrostatic collector deposits PM sample onto transparent polydimethylsiloxane (PDMS) coated substrate, where PAH components are extracted into solid-phase (SP) solvent and analyzed using EEM spectroscopy in-situ. We evaluated external and internal excitation schemes to optimized signal to noise ratio. Analysis of woodsmoke and cigarette smoke samples showed good agreement with liquid extraction EEM spectra. Internal excitation is hindered by fluorescent interference from PDMS at λ<250nm. The external excitation EEM spectra are dependent on the incident angle; ranges of 30-40⁰ and 55-65⁰ showed the best results. The proposed SP-EEM technique can be used for development of miniaturized sensors for chemical analysis of combustion generated PM. </p>

Fabrication of Nanoscale Homogeneous Lead Azide@Carbon Fiber Film with Low Electrostatic Sensitivity by In-situ Synthesis

2021 ◽  
Author(s):  
Zhenzhan Yan ◽  
Li Yang ◽  
Ji-Min Han ◽  
Haojie Li ◽  
Junda Huo
Keyword(s):  
Carbon Fiber ◽  
Lead Acetate ◽  
In Situ Synthesis ◽  
Raw Material ◽  
Lead Azide ◽  
Nano Scale ◽  
Carbon Based

In this work, a nano-scale carbon-based lead azide initiating film was prepared by electrospinning, carbonization, azide, and other steps using cheap and easily available lead acetate as the raw material....

Reservoir sediment as a secondary raw material in concrete production

2015 ◽  
Vol 17 (5) ◽  
pp. 1161-1169 ◽  
Author(s):  
Natalia Junakova ◽  
Jozef Junak ◽  
Magdalena Balintova
Keyword(s):  
Raw Material ◽  
Reservoir Sediment ◽  
Concrete Production ◽  
Secondary Raw Material
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