Preparation and Application of Cesium Bicarbonate_Industrial Additives

Background and overview of preparation and application of cesium bicarbonate

Cesium bicarbonate is an orthorhombic crystal. The melting point is 175℃ (and removes 1/2H₂O). It is easily soluble in cold water, extremely soluble in hot water, and soluble in ethanol. When cesium bicarbonate is heated, cesium carbonate, carbon dioxide and water can be obtained. Preparation method: Pour the concentrated solution of Cs₂CO₃ into CO₂, or pass the 80% ethanol solution of CsOH into CO₂Prepared.

Preparation and application of cesium bicarbonate

Put cosmonite CsAlSi₂O₆ containing cesium 28% Cs₂O into concentrated sulfuric acid for acid leaching and leaching with sulfuric acid. 4 hours, reaction temperature 120°C, sulfuric acid concentration 35% nitrite tetrafluoroborate, liquid-to-solid ratio 3:1, and then constant temperature filtration; remove the acid leaching residue and enter the process of precipitating cesium alum; sodium bicarbonate separates the precipitated cesium alum into crude cesium Alum and precipitated alum mother liquor, neutralize and discharge the precipitated alum mother liquor; add deionized water to the crude cesium alum for two recrystallizations, with a liquid-to-solid ratio of 8:1, and return the primary recrystallization mother liquor produced by the two recrystallizations. Back to the acid leaching process, add the refined cesium alum produced by two recrystallizations to deionized water and lime slurry to enter the aluminum sulfate removal process. The reaction temperature is 90°C, the reaction time is 1 hour, the lime slurry concentration is 7%, and the cesium alum slurry concentration is 40%. ;

Separate the concentrated liquid into cesium sulfate solution and slag. The slag is washed with pure water and the separated slag liquid can be returned to the aluminum sulfate removal process; pure barium hydroxide is added to the cesium sulfate solution to enter the sulfate removal process, and the barium hydroxide Add in excess, the excess is 10%; the solution after removing sulfate is filtered once into a cesium hydroxide solution and filter residue, and the filter residue is washed with deionized water and divided into barium residue and cesium hydroxide washing liquid; the cesium hydroxide washing liquid and hydrogen The cesium oxide solution is mixed and passed through carbon dioxide to enter the primary hydrogenation process, the end point is ph = 9; the solution after primary hydrogenation is filtered twice into filter residue and hydrogenation liquid, and the filter residue is returned to the barium residue washing process; the hydrogenation liquid enters the concentration and cooling process (concentration end point) Temperature 105°C, cooling end temperature: normal temperature concentration cooling parameter); filter the concentrated and cooled hydrogenated liquid; after filtration, it becomes concentrated liquid residue and concentrated pure liquid. The concentrated liquid residue is returned to the barium slag washing process and added to the concentrated pure liquid. Carbon dioxide is introduced for secondary hydrogenation. The end point of hydrogenation is ph=8. After filtration, the pure liquid of secondary hydrogenation is obtained. The filter residue is returned to the barium residue washing process. Concentration cooling crystallization process: the secondary hydrogenation net liquid is concentrated and cooled again. The concentration end temperature is 130°C and the cooling end temperature is normal temperature. At this time, the cesium bicarbonate crystals precipitate from the solution. After centrifugal separation, the crystallization mother liquor and cesium bicarbonate wet material are obtained. .

Preparation and application of cesium bicarbonate

CN201380082028.8 describes a method for recovering or separating cesium formate or rubidium formate or both from a mixed alkali metal formate blend. One method involves adding cesium sulfate or rubidium sulfate to the mixed alkali metal formate blend to preferentially precipitate potassium sulfate from the mixed alkali metal formate blend. Another approach involves adding cesium carbonate or cesium bicarbonate or both to preferentially precipitate potassium carbonate/potassium bicarbonate and/or other non-cesium or non-rubididium metals from the mixed alkali metal blend. Further optional steps are also described. Yet another method involves converting cesium sulfate into cesium hydroxide.

References

[1] [China invention, China invention authorization] CN201010106770.6 New process for producing cesium carbonate from cosmite

[2] CN201380082028.8 Method for collecting cesium formate from mixed alkali metal formate blend

[3]Compound Dictionary