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The ADU cake (aqueous route) after vacuum filtration contained higher moisture (60–70%) compared to the ADU cake obtained by gaseous route (5–10%). The ADU cake produced through gaseous route became powder after drying in oven at 100
Ammonium diuranate (NH 4) 2 U 2 O 7 (ADU), once used to create coloured glazes in ceramics, is the most prominent chemical
The dried cake was calcined in a muffle furnace at. the temperatures of 450 O C, 550 O C, 650 O C and 750 O C. for a period of 2.5 h [15]. (NO/sub 3/)/sub 2/ solution in ADU precipitation. (auth)
The precipitation of ADU from uranyl fluoride solution after hydrolyzing UF6 the ADU cake is washed with water and refiltered, the fluoride content decreases to less . VAECAR 07
Continuous precipitation in one and two stages was investigated to determine the effect of precipi nation variables on the properties of ADU precipitates and
This low energy repulping method separates fibers while leaving contaminants largely whole, so that fiber can be readily screened from contaminants. As
The more the cake can be broken up before mixing the better, so a good drop past some cake breakers (cables strung under filter) onto a conveyor followed by a
08 12 Flooding that begins within 6 hours and often within 3 hours of the heavy rainfall or other cause Flash Floods can be caused by a number of things but
In Bridgetown, more than 100 mm (4 in) of rain fall per month from June to November; the wettest period runs from September to November, with around 170/180
after the first step. Precipitation in acidified water and purification of the crude polymer by reprecipitation in Et 2Ogave polymer 9 containing both βO4 and β–β units in 48% yield
every 10 min for 1 h to obtain an apparent equilibrium. When precipitation was complete, the black liquor was filtered (deadend filtration, using Munktell qualitative filter paper, Grade 5) using a Büchner funnel setup; the filtrate was collected and stored at 4 °C. The filter cake (a darkcolored solid) was then washed with acidified (H 2 SO 4
Performance of magnesiothermic reaction and recovery and quality of uranium largely depends on properties of UF 4.As ammonium diuranate (ADU) is first product in powder form in the process flowsheet, composition of ADU with progress in precipitation reaction has been studied with special attention on first appearance of the
The negative effects of low residual effective alkali include recondensation and reprecipitation of lignin, lower bleachability, lower fibre strength of the pulp, increased corrosion at the bottom of the digester,
Lignin has shown a great potential to produce fuels, valueadded chemicals, and functional materials due to its highenergy density and intrinsic aromaticbased structure. Yet, the lignin precipitation of different biomasses needs investigation because most of the work has been performed on softwood and much less is known about
The cotton pulp black liquor (CPBL) is high alkalinity wastewater generated in the production of cotton pulp dreg. In the present work, CPBL was treated by a coupling process of alkaline precipitation and alkaliactivated hydrogen peroxide (H 2 O 2) oxidation to remove colorants, so that the water and alkali can be reused in cotton linters cooking
The more the cake can be broken up before mixing the better, so a good drop past some cake breakers (cables strung under filter) onto a conveyor followed by a few transfer points will help. Difficult to say what kind of power densities you will need or residence time but 15kw/m3 is the norm and a little lab/pilot work should put you in the
AUTHOR INDEX To Use this Index: Scroll down or use the bookmarks in the lefthand navigation pane to move to a new location in this index. Click on a maroon paper title to view that paper. To return to this index after viewing a paper, click the PREVIOUS MENU bookmark in the left navigation pane. A Adler, Robert K.
After wet combustion in a microwave oven, the Na and K concentrations of the black liquor were measured by atomic absorption spectroscopy (AAS) (Thermoscientific iCE 3000), with the errors in measurement being ±1.6% and ±6.0%, respectively. The Na concentration of the washed lignin filter cake was also measured by AAS after wet combustion.
Purification Final purification is performed by redissolution of ADU in HNO 3; the resulting uranyl nitrate solution is filtered to remove insolubles. ADU is again precipitated with NH 3; the ADU slurry is filterpressed and washed with water to remove soluble salts [sampling 8]. The barren filtrate is recycled to the leaching stage.
It was called "Repulping filter cakes from a plate and frame filter press". We are going with the repulping tank idea as I will have a fresh concentrate, no head height, limited budget and no surge thickener. But after a recently commissioned IsaMill M10000 UFG circuit these roasters will be shut down. Therefore these storage tanks are now
Ammonium diuranate (NH 4) 2 U 2 O 7 (ADU), once used to create coloured glazes in ceramics, is the most prominent chemical compound among the uranium ore concentrates, often referred to as
After addition of acid, the presence of solid matter becomes readily apparent; for instance Namane et al. () attributed slow lignin cake dewatering after lowering the pH of black liquor to the precipitation of
precipitation was obtained at pH 2 and comparably result could be obtained at pH 4.5 followed by 1 hour heating by addition of anthraquinone (AQ) in the pulping process showed an improved carbohydrates stabilization and better delignification. NaOH extraction was used in order to obtain lignin for use production of polyurethane [34].
Batch precipitation of ammonium diuranate (ADU) was carried out at various temperatures and at different flow rates of ammonia and their effects on the characteristics of ADU such as the nature of settling, moisture content, ammoniatouranium mole ratio and nitrate content have been studied.
T1 Influence of organic additives on calcium carbonate precipitation during kraft pulping. AU Guo, Jihui. AU Severtson, Steven J. PY 2002/10/1. Y1 2002/10/1. N2 In this study we monitored calcium during laboratory batch cooks to evaluate the influence of various organic additives on the precipitation of CaCO3 during kraft pulping.
@article{osti_4142784, title = {Study of continuous precipitation of ADU for the implantation in the pilot installation at the Atomic Energy Institute, Brazil. Estudo de precipitacao continua de DUA para a implantacao na instalacao piloto CEQIEA}, author = {Araujo, Jose Adroalado de}, abstractNote = {The paper deals with the ammonium diuranate
Fractionation of lignocellulose into its three main components, lignin, hemicelluloses, and cellulose, is a common approach in modern biorefinery concepts. Whereas the valorization of hemicelluloses and cellulose sugars has been widely discussed in literature, lignin utilization is still challenging
The 4 processes principally used in chemical pulping are kraft, sulfite, neutral sulfite semichemical (NSSC), and soda. The first 3 display the greatest potential for causing air pollution. The kraft process alone accounts for over 80 percent of the chemical pulp produced in the United States. The choice of pulping process is determined by the
In this thesis, the extraction of lignin from black liquor using the “LignoBoost” process was investigated, with the primary focus being on increasing knowledge of the precipitation of lignin. The chemical reactions and the kinetics of the gas absorption process were studied and a mathematical model proposed that can describe
AUTHOR INDEX To Use this Index: Scroll down or use the bookmarks in the lefthand navigation pane to move to a new location in this index. Click on a maroon paper title to view that paper. To return to this index after viewing a paper, click the PREVIOUS MENU bookmark in the left navigation pane. A Adler, Robert K.
