Barium Chloride

2021 ◽  
Keyword(s):  
Barium Chloride

Pilot Scale Testing of a New Radium-226 Removal Process

1985 ◽  
Vol 20 (2) ◽  
pp. 55-67
Author(s):  
W.B. Anderson ◽  
P.M. Huck ◽  
T.M.R. Meadley ◽  
T.P. Hynes
Keyword(s):  
Treatment Process ◽  
No Reduction ◽  
High Surface ◽  
High Surface Area ◽  
Barium Chloride ◽  
Pilot Scale ◽  
Activity Levels ◽  
New Process ◽  
Removal Efficiencies ◽  
New Treatment

Abstract This paper describes the on-going pilot scale development of a new treatment process designed to remove radium-226 from uranium milling effluents. Presently, decants from Canadian uranium mining and milling tailings areas are treated with barium chloride to remove radium-226 prior to discharge into the environment. This is usually accomplished in large natural or man-made ponds which provide an opportunity for a (Ba,Ra)SO4 precipitate to form and subsequently settle. Sand filtration is sometimes used as a polishing step. This new process differs from conventional and other experimental processes in that it involves the use of a fluidized bed to facilitate the deposition of a (Ba,Ra)SO4 precipitate on a granular medium of high surface area. As a stand-alone treatment process, the new process is consistently able to reduce incoming radium-226 activity levels by 90-99%. Effluent levels of 10 pCi/L (0.370 Bq/L) or less have been achieved, depending on the influent activity levels. Recent testing of the process as a polishing step has demonstrated radium removal efficiencies up to 60% when the process influent was already less than 5 pCi/L (0.185 Bq/L). The process has been operated at temperatures ranging from 26°C down to 0.3°C with no reduction in efficiency. In contrast to treatment times in the order of days for conventional settling pond systems and hours for mechanical stirred tank/filtration systems, the new process is able to achieve these radium removal efficiencies in times on the order of one minute.

Syntheses of ultra-fine barium carbonate powders by homogeneous precipitation method

2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Guo Chen ◽  
Jin Chen ◽  
Jinhui Peng
Keyword(s):  
Barium Carbonate ◽  
Barium Chloride ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Chloride Dihydrate ◽  
Homogeneous Precipitation Method

AbstractUltra-fine barium carbonate powders were successfully synthesized using barium chloride dihydrate (BaCl

Structure of barium chloride-oxide tellurite glasses

2009 ◽  
Vol 355 (31-33) ◽  
pp. 1574-1584 ◽  
Author(s):  
V.O. Sokolov ◽  
V.G. Plotnichenko ◽  
V.V. Koltashev
Keyword(s):  
Barium Chloride ◽  
Tellurite Glasses

Ion exchange process in the presence of high sulphate concentration: resin regeneration and spent brine reuse

2006 ◽  
Vol 6 (3) ◽  
pp. 35-41 ◽  
Author(s):  
R. Baciocchi ◽  
A. Chiavola
Keyword(s):  
Sodium Chloride ◽  
Ion Exchange ◽  
Exchange Process ◽  
Chloride Concentration ◽  
Barium Chloride ◽  
Ion Exchange Resin ◽  
Mass Action ◽  
Sulphate Concentration ◽  
Ion Exchange Process ◽  
Resin Regeneration

This paper provides new insights on the regeneration step of an ion exchange process for the treatment of surface and ground water characterized by high sulphate concentration. Repeated regeneration of ion exchange resin with a sodium chloride solution (brine) did not alter the resin performances with respect to the fresh one. Besides, neither the sodium chloride concentration of the brine, which was varied between 1 and 3 M, nor the presence of sulphates at concentrations up to 20 g/L in the brine, did notably affect the regeneration efficiency. The brine was effectively treated by adding calcium or barium chloride, in order to remove the sulphates and re-establish the original chloride concentration. Calcium chloride was allowed to obtain up to 70% sulphate precipitation, whereas an almost 100% precipitation efficiency was obtained when barium chloride was used. The precipitation step was described by a model based on the mass action, coupled to the Bromley model for the description of the non-ideal behaviour of the electrolytic solution. This model was shown to give correct, or at least conservative, estimates of the equilibrium sulphate concentration when either calcium or barium chloride was used as precipitating agent.

scholarly journals Cation exchange capacity of an oxisol amended with an effluent from domestic sewage treatment

2005 ◽  
Vol 62 (6) ◽  
pp. 552-558 ◽  
Author(s):  
Adriel Ferreira da Fonseca ◽  
Luís Reynaldo Ferracciú Alleoni ◽  
Adolpho José Melfi ◽  
Célia Regina Montes
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Sewage Treatment ◽  
Barium Chloride ◽  
Dry Weight ◽  
Tropical Soils ◽  
Exchange Capacity ◽  
Strong Positive Correlation ◽  
Ionic Force ◽  
Barium Chloride Solution

The addition of Na-rich anthropogenic residues to tropical soils has stimulated the scientific community to study the role of sodium in both the soil solution and the exchange complex. In this study, several different methods were used to calculate the concentration of exchangeable and soluble cations and this data was then used to establish correlations between the level of these cations and both the accumulation of various elements and the dry weight of maize grown in a greenhouse under different conditions. In the closed environments of the pots, the most suitable method for calculating the effective cation exchange capacity (ECEC) was the cation exchange capacity calculated by cations removed with barium chloride solution (CEC S). Then again, the actual cation exchange capacity (CEC A) should be measured by using Mg adsorption to prevent ionic force from influencing electric charges. A strong positive correlation was obtained between the concentrations of Na in the 1:2 soil:water extracts and the accumulation of Na in the maize plants, indicating saline or double acid extractors are not needed when monitoring the Na concentration only.

Sign in / Sign up

Export Citation Format

Share Document