قائمة الطعام
Increasing ion association in high-pressure aqueous solutions implies that, at a given salinity, high-density water in deep, cold planetary oceans and pore waters will possess lower ionic strength ...
Keywords Lanthanum hydroxide; High pressure; Flux method; Single crystal High pressure synthesis of solid material tends to increase the density, coordination number, symmetry of material and shorten bond length. The solid synthesized at a high pressure and decompressed to ambient pressure often exhibits a meta- stable …
The alkaline leaching of silica solid solutions were performed in a GS-0.10 high-pressure reactor (Weihai Dingda Chemical Machinery Co., Ltd, China). A certain amount of oxidized clinker was added into the high-pressure reactor together with 100 mL of sodium hydroxide solution or sodium silicate solution, then the high-pressure reactor …
The reaction between CO 2 and hydroxides produces pure carbonate by high adsorption capacity, low thermal chemical adsorption, which is able to adsorb CO 2 at ambient temperature and pressure 10 ...
Earth Sciences. December 10, 2019. New aluminum hydroxide stable at extremely high pressure. by Ehime University. The crystal structure of ε …
The crystal structure of a high-pressure phase of calcium hydroxide, Ca(OH) 2 (portlandite), was clarified for the first time using the combination of in situ single-crystal and powder X-ray diffraction measurements at high pressure and room temperature. A diamond-anvil cell with a wide opening angle and cell-assembly was …
The production of the mixed hydroxide of high quality is an alternative to smelting, converting, and refining. The OZ Minerals West Musgrave Project (WMP) in Western Australia was used as a basis for ... The slurry feed was via high-pressure progressive cavity pumping while cooling waters were injected via high-pressure piston …
Crystal structure, hydrogen bonding, and high-pressure behavior of the hydroxide perovskite MgSi (OH)6: A phase relevant to deep subduction of hydrated …
High pressure acid leaching experiments were conducted in a Parr-4532 model, 2 ... Then, from the amount of sodium hydroxide consumed, the residual acid in the pregnant leach solution was determined. For the oxidation–reduction potential measurements, a Pt-Ag/AgCl electrode (saturated with KCl) was used and the measured …
This review will discuss the current state of studies on phase transformations in the Fe–H and related systems and also on the composition, crystal structure and …
Layered Double Hydroxide Nanoplatelets with Excellent Tribological Properties under High Contact Pressure as Water-based Lubricant Additives. Sci. Rep. 6, 22748; doi: 10.1038/srep22748 (2016).
Until recently, there were seven compounds known in the system Ni‐B‐O(‐H), among them two high‐pressure phases (HP‐NiB 2 O 4 and β‐NiB 4 O 7 7) and five compounds, which were synthesized at ambient or moderate pressure conditions {Ni[B 6 O 7 (OH) 6]·5H 2 O, Ni(H 2 O) 4 [B 6 O 7 (OH) 6]·H 2 O, NiB 12 O 14 (OH) 10, Ni 3 (BO 3) …
Here authors describe the high-pressure syntheses of seven La-H phases; they report crystal structures and remarkable regularities in rare-earth element hydrides.
A deconvolution of the spectra is suggested using a model with four Gaussian functions, which are assigned to the molecular H2O and OH- vibrations, and one asymmetric exponentially modified Gaussian (EMG) function, which is assigned to [HO(H2O)n]- vibrations. Hydrothermal diamond anvil cell experiments in combination …
The MHP sample used in this study was a polymetallic mixed hydroxide precipitate from a smelter in Sichuan. It was obtained by active MgO neutralization and precipitation of the nitric acid pressure leach solution of laterite nickel ore. The MHP is slurry after neutralization and precipitation of nitric acid pressure leach solution.
We discuss the high-pressure phases of crystalline lithium hydroxide, LiOH. Using first-principles calculations, and assisted by evolutionary structure searches, we reproduce the experimentally known phase transition under pressure, but we suggest that the high-pressure phase LiOH-III be assigned to a new hydrogen-bonded tetragonal …
1.. IntroductionAt the 1996 ALTA Nickel Conference, Cognis introduced the concept of treating nickel laterites (Mackenzie et al., 1996) using a high-pressure acid leach (HPAL) followed by mixed hydroxide precipitation (MHP), ammonia releach of nickel and cobalt and the refining of nickel using LIX ® 84-INS based solvent extraction (SX).In the …
Introduction. Hydroxides of a divalent metal M(OH) 2 (M=Mg, Ca, Mn, Co, Ni, Cd, etc.) under ambient conditions assume a brucite-type layered hydroxide with a CdI 2 structure (trigonal, space group P 3 ¯ m1). The structure consists of MO 6 octahedral layers with hydrogen bonds between the layers. Hydrogen-bearing materials with this simple …
Sodium hydroxide is an alkaline ingredient used in cleaning products like cleaners and detergents. It is highly water-soluble and absorbs moisture and carbon dioxide from the air. The dissolution of sodium hydroxide in water is a highly exothermic process that generates significant heat.
Evolutionary algorithms and the particle swarm optimization method have been used to predict stable and metastable high hydrides of iron between 150 and 300 GPa that have not been discussed in previous studies. Cmca FeH5, Pmma FeH6, and P2/c FeH6 contain hydrogenic lattices that result from slight distortions of the previously …
Sodium hydroxide solutions are more propitious to the pulp and paper industry compared to other working pairs. Novel correlations have been developed to compute the vapor pressure, density, enthalpy, and viscosity of sodium hydroxide solutions. ... Å. & Aly, G. Thermophysical properties of aqueous NaOH−H 2 O solutions at high …
Aqueous sodium hydroxide (NaOH) solutions at high pressure and temperature: insights from in situ Raman spectroscopy and ab initio molecular dynamics …
Using first-principles calculations, and assisted by evolutionary structure searches, we reproduce the experimentally known phase transition under pressure, but …
Indonesia has the largest nickel source in the world. It is estimated, there are about 21 million metric tons of nickel reserves in Indonesia. Laterite nickel ore is the most abundant nickel source especially in tropical regions. Mixed hydroxide precipitate (MHP) is intermediate product of this process. In this research, the MHP product from PT.
Aqueous sodium hydroxide (NaOH) solutions at high pressure and temperature: insights from in situ Raman spectroscopy and ab initio molecular dynamics simulations J. Stefanski, C. Schmidt and S. Jahn, Phys. Chem. Chem. Phys., 2018, 20, 21629 DOI: 10.1039/C8CP00376A
In2O3 and experimental realization of new In2O3 polymorphs, the complete pressure-temperature diagram of indium oxide is still lacking. Even less is known about high pressure behavior of indium hydroxide. Indium hydroxide, c-In(OH)3, has so-called A site deficient hydroxyl-perovskite structure (space group Im3, No. 204, a=7.979 Å, Z = 8).
Structure of a High-Pressure Hydroxide Ta 2 O 5 · 2/3H 2 O and a Derivative Metastable Oxide Ta 2 O 5. I. P. Zibrov*, V. P. Filonenko**, D. V. Drobot***, and E. E. Nikishina***
The reaction between CO 2 and hydroxides produces pure carbonate by high adsorption capacity, low thermal chemical adsorption, which is able to adsorb CO 2 at ambient temperature and pressure 10.Lithium hydroxide has been used for CO 2 adsorption due to its high CO 2 storage capacity (30 wt.%), with applications in space …
Such a case is presented by the compound Mn(OH)Cl. Already synthesized and described by Ribi in 1948, 10 compounds with these composition are still not entirely structurally elucidated. Cell parameters of the orthorhombic α-phase were determined, but they disagree in the different references.
Here we combine high pressure and temperature electrical conductivity experiments, Raman spectroscopy and first-principles simulations to investigate the state of hydrogen in the pyrite-type...
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