Results 11 to 20 of about 5,640,070 (351)
Cleaner Engineering and Technology, 2021 Several hydrometallurgical routes have been proposed in the literature to treat printed circuit boards (PCBs) from waste electronic equipment. These employ different chemical reagents for the recovery and separation of metals as metals or their salts ...
Vamsi Vikram Gande +3 more
doaj +1 more source
Determination of rare earth elements, uranium and thorium in soil samples by microwave-assisted acid digestion and inductively coupled plasma mass spectrometry [PDF]
Songklanakarin Journal of Science and Technology (SJST), 2021 This paper presents a simple microwave digestion method for soil samples leading to correct determination of the rare earth elements (Ce, La, Nd, Sc), uranium (U) and thorium (Th) using inductively coupled plasma mass spectrometry (ICP-MS).
Sasikarn Nuchdang +3 more
doaj +1 more source
Electrochemical Behavior of ReO-4 in Sulfuric Acid and Nitric Acid Media
He huaxue yu fangshe huaxue, 2022 99Tc is one of the main fission products in nuclear spent fuel in power reactor. Its half-life period is 2.13×105 years, which has long-term harm to the ecological environment, and it gets special attention in PUREX process.
DENG Yi-lin, ZHANG Hu
doaj +1 more source
Rapid growth of new atmospheric particles by nitric acid and ammonia condensation
Nature, 2020 A list of authors and their affiliations appears at the end of the paper New-particle formation is a major contributor to urban smog 1 , 2 , but how it occurs in cities is often puzzling 3 .
Mingyi Wang +80 more
semanticscholar +1 more source
Chemical Engineering Journal Advances, 2022 The development of recovery techniques for metals present in low concentrations in E-waste, such as silver and palladium, is important from the aspect of the circular economy.
Joona Rajahalme +2 more
doaj +1 more source
The utilization demineralized rice husk waste for biofuel source via pyrolysis: thermogravimetric analysis and kinetic study [PDF]
MATEC Web of Conferences, 2019 Rice husk is considered as agricultural waste that causes environmental problem during its handling. In this study, rice husk was treated with acid (citric acid and nitric acid) solutions prior used as raw material for producing biofuel and chemicals via
Wijayanti Hesti +2 more
doaj +1 more source
Kirk‐Othmer Encyclopedia of Chemical Technology, 2020 The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water. Most commercially available nitric acid has a concentration of 68% in water.
Michael C.E Groves
semanticscholar +1 more source
Mechanical Properties of Reactive Powder Concrete (RPC) Exposed to Acidic Solutions
Tikrit Journal of Engineering Sciences, 2022 This research work includes an experimental investigation to study the mechanical properties of reactive powder concrete (RPC) exposed to acidic solutions.
Ali H. Ali, Ahmed K. Ibrahim
doaj +1 more source
Renewable production of ammonia and nitric acid
AIChE Journal, 2020 Decarbonization of the power sector offers ammonia industry an opportunity to reduce its CO 2 emissions through sector coupling. Extending from our previous work, we propose a power-based process for ammonia and nitric acid production.
G. Wang, A. Mitsos, W. Marquardt
semanticscholar +1 more source
Optimizing of Synthesis of High Purity HMX Using Polyphosphoric Acid by Response Surface Method [PDF]
Iranian Journal of Chemical Engineering, 2023 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) is one of the most powerful explosives of which the purity may have a significant effect on increasing the performance of rocket engines. In this research, the synthesis of high purity HMX is presented
M.A. Zarei +5 more
doaj +1 more source