The Removal of Uranium From Simulated Ammonium Diuranate Filtrate by Nanofiltration

2017 ◽  
Author(s):  
Yuan Zhongwei ◽  
Wang Runci ◽  
Yan Taihong ◽  
Zheng Weifang
Keyword(s):  
Ammonium Nitrate ◽  
Uranium Concentration ◽  
Nitrate Concentration ◽  
Nitrate Solution ◽  
Testing Device ◽  
Permeate Flux ◽  
Ammonium Diuranate ◽  
Ammonium Nitrate Solution ◽  
Crossflow Velocity ◽  
Very High

In this study, a simulated ammonium diuranate filtrate (ADUF) which was obtained by adding uranyl nitrate to a 35 g/L ammonium nitrate solution to adjust the uranium concentration to about 50 mg/L was treated by a nanofiltration process. Experiments were carried out on a plate membrane testing device with a trans-membrane pressure (TMP) range of 0.5 ∼ 3.0 MPa, a crossflow velocity range of 10 ∼ 50 cm/s and a temperature range of 5 ∼ 35 °C. The results show that NF270 membrane has good rejection property for uranium and excellent permeability for ammonium nitrate. The ammonium nitrate concentration in the permeate is about 32 g/L which means the reject ratio of ammonium nitrate is only about 10%. Though NF270 membrane shows good uranium rejection property, the corresponding permeate flux is very high. When the trans-membrane pressure is 1.5 MPa, the uranium reject ratio is 96.8% and the the corresponding permeate flux is about 80 L/(m2·h). It indicates a bright application prospect of nanofiltration process in the treatment of ADUF.

Removal of uranium from ammonium nitrate solution by nanofiltration

2017 ◽  
Vol 105 (12) ◽  
Author(s):  
Runci Wang ◽  
Zhongwei Yuan ◽  
Taihong Yan ◽  
Weifang Zheng
Keyword(s):  
Ammonium Nitrate ◽  
Nitrate Solution ◽  
Tangential Velocity ◽  
Experimental Results ◽  
Transmembrane Pressure ◽  
Operating Parameters ◽  
Permeate Flux ◽  
Nanofiltration Membranes ◽  
Ammonium Nitrate Solution ◽  
Feed Temperature

AbstractTwo types of nanofiltration membranes were tested to remove uranium dissolved in ammonium nitrate solution, and the influence of operating parameters as transmembrane pressure, tangential velocity and feed temperature was investigated. Experimental results showed NF270 membrane can reject more than 96% uranium and allow most (90% min) ammonium nitrate solution passed by, and with a permeate flux of 60 L/(m

Determination of limiting current density for different electrodialysis modules

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Natália Káňavová ◽  
Lubomír Machuča ◽  
David Tvrzník
Keyword(s):  
Ammonium Nitrate ◽  
Flow Velocity ◽  
Current Density ◽  
Nitrate Concentration ◽  
Nitrate Solution ◽  
Limiting Current ◽  
Linear Flow ◽  
Limiting Current Density ◽  
Ammonium Nitrate Solution ◽  
Linear Flow Velocity

AbstractLimiting current density of ammonium nitrate solution in laboratory-, pilot-, and industrial-scale electrodialysis modules were determined to provide a method for the prediction of the limiting current density of ammonium nitrate solutions at any conditions. The current-voltage curve was measured in each case and the limiting current density was evaluated using the dependence of the derivative, dI/dU, on the electric current, I. The limiting current was determined as a current at which the derivative dI/dU equals zero. The developed method enables not only the prediction of the limiting current density but the limiting cut and limiting flux can be determined concurrently at any linear flow velocity of the diluate and inlet ammonium nitrate concentration. It could help to prevent working in the overlimiting region and to avoid undesirable decrease of current efficiency and pH changes. The limiting cut is the maximal cut that can be obtained at certain linear flow velocity and module geometry irrespective of the inlet ammonium nitrate concentration and it is very useful information when designing a new electrodialysis unit for specific application.

Degradation of Materials Based on Alkali-Activated Blast-Furnace Slag after Exposure to Aggressive Environments

2021 ◽  
Vol 325 ◽  
pp. 131-136
Author(s):  
Iveta Plšková ◽  
Petr Hrubý ◽  
Libor Topolář ◽  
Michal Matysík
Keyword(s):  
Blast Furnace ◽  
Ammonium Nitrate ◽  
Sodium Sulfate ◽  
Blast Furnace Slag ◽  
Nitrate Solution ◽  
Ammonium Nitrate Solution ◽  
Degradation Of Materials ◽  
Non Destructive ◽  
Furnace Slag ◽  
Alkali Activated

The paper summarizes partial results of a study of degradation of materials based on alkali-activated blast-furnace slag (AAS) and comparative on cement CEM III/A 32.5 R after exposure to aggressive environments. It further specifies the possibilities for utilising destructive and non-destructive techniques to determine the progress of degradation and characterizes the degree of their correlation. After 28 days of ageing in a water environment, the produced test specimens (40×40×160 mm beams) were placed in aggressive media (ammonium nitrate solutions; sodium sulfate, rotating water) and after subsequent 28, 56 and 84 days of degradation were subjected to testing. Testing comprised both a destructive form (determination of compressive strength and flexural strength) and a selected non-destructive technique (Impact-echo method). The partial outputs were supplemented by the results acquired from monitoring weight changes. In addition, the development of Ultrasonic Pulse Velocity in relation to the progress of the degradation processes was also monitored. While the exposure of both test specimens to water and sodium sulfate did not result in any significant changes, the exposure to the ammonium nitrate solution exhibited rapid signs of degradation associated with a significant reduction in functional characteristics.

Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution

2014 ◽  
pp. 431-438 ◽  
Author(s):  
Quoc Phung ◽  
Norbert Maes ◽  
Diederik Jacques ◽  
Geert De Schutter ◽  
Guang Ye
Keyword(s):  
Ammonium Nitrate ◽  
Nitrate Solution ◽  
Permeability Changes ◽  
Ammonium Nitrate Solution

Electrical conductivity, speeds of sound, and viscosity of aqueous ammonium nitrate solutions

2001 ◽  
Vol 79 (8) ◽  
pp. 1207-1212 ◽  
Author(s):  
Abdul Wahab ◽  
Sekh Mahiuddin
Keyword(s):  
Electrical Conductivity ◽  
Ammonium Nitrate ◽  
Structural Information ◽  
Ion Pairs ◽  
Nitrate Solution ◽  
Hydration Number ◽  
Isentropic Compressibility ◽  
Speeds Of Sound ◽  
Ammonium Nitrate Solution ◽  
Nitrate Solutions

Density, electrical conductivity, speeds of sound, and viscosity of aqueous ammonium nitrate solutions were measured as functions of concentration (m, mol kg–1) (0.1599 [Formula: see text] m [Formula: see text] 20.42) and temperature (T, K) (273.15 [Formula: see text] T [Formula: see text] 323.15). Experimental values are consistent with the reported data. Variation of isotherms of electrical conductivity, isentropic compressibility, and structural relaxation time with concentration evoke structural information on the ion solvation in aqueous ammonium nitrate solution at different concentration regions. The primary hydration numbers of ammonium nitrate were estimated at a particular concentration at which the isentropic compressibility isotherms converge. The existence of free hydrated ions, resulting from strong ion solvent interactions in dilute to 9.1 mol kg–1, the solvent-separated ion-pairs resulting from the relative competition between the ion–solvent and the ion–ion interactions in 9.1 to 12.0 mol kg–1, and the solvent-shared ion-pairs beyond 12.0 mol kg–1 resulting from a decrease in the number of solvent molecules, govern the transport process.Key words: electrical conductivity, speeds of sound, viscosity, ammonium nitrate, hydration number.

Mössbauer studies of the corrosion products of iron formed in aqueous ammonium nitrate solution

1983 ◽  
Vol 23 (7) ◽  
pp. 733-752 ◽  
Author(s):  
Pushpalatha C. Bhat ◽  
M.P. Sathyavathiamma ◽  
N.G. Puttaswamy ◽  
R.M. Mallya
Keyword(s):  
Ammonium Nitrate ◽  
Nitrate Solution ◽  
Corrosion Products ◽  
Mössbauer Studies ◽  
Ammonium Nitrate Solution

scholarly journals Comparison of McMaster and Mini-FLOTAC effi ciency methods in diagnostics of Ascaris suum infection in young pigs

2020 ◽  
pp. 85-91
Author(s):  
O. Kruchynenko ◽  
A. Antipov
Keyword(s):  
Specific Gravity ◽  
Ammonium Nitrate ◽  
Nitrate Solution ◽  
Diagnostic Efficiency ◽  
Young Pigs ◽  
Ammonium Nitrate Solution ◽  
Effi Ciency ◽  
Scientific Laboratory ◽  
Flotac Technique ◽  
Efficiency Comparison

The coproovoscopic methods involving count chambers are widely used in the veterinary practice for diagnostics. These methods are important in assessments of the prevalence rates of nematode infections in pigs and for FECR tests. However, more basic data is needed on the efficiency of the commercial methods of diagnostics, tested at the different specific gravity of the flotation solutions. In a thorough analysis of publications of Ukrainian scientists, we have found that the data is sparse on the efficiency comparison of the modified McMaster’s and MiniFLOTAC methods. The aim of our study was to compare the efficiency of the commercial coproovoscopic techniques: the modified McMaster’s method (with sensitivity of 25 EPG), and MiniFLOTAC combined with Fill-FLOTAC (with sensitivity of 5 EPG) in testing for A. suum infection in piglets. Results of approbation of the mentioned methods are presented for the following saturated solutions: NaCl (SG=1.2), MgCl2 •6H2 O (SG =1.27) and NH4 NO3 (SG=1.28). Fecal samples were taken at own private farm, in Mlynok village of Onufriivka district, Kirovohrad region from 20 4 month old pigs with spontaneous A. suum infection. The laboratory assessments were performed in the Scientific Laboratory of Parasitology and Veterinary and Sanitary Expertise of the Poltava State Agrarian Academy. It is established that at high rates of A. suum infection in young pigs, McMaster’s method with the ammonium nitrate solution is more efficient compared to the Mini-FLOTAC method. In average, 5331.2 eggs of A. suum were determined per 1 g of feces using the former method, compared to 4567.5 EGP according to the Mini-FLOTAC technique (P < 0.001). The highest diagnostic efficiency of the modified McMasters method and the combination of Mini-FLOTAC and Fill-FLOTAC is seen when ammonium nitrate (NH4 NO3 ) solution of 1.28 SG is used (P < 0.001). Our results add new data on the efficiency of the commercial methods of diagnostics with varying specific gravity of the flotation solutions, for pigs infected with nematodes. Key words: EPG, pigs, nematode, ascariasis, diagnostics, efficiency.

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