摘要:
High-purity barium chloride (99.60% or more) is produced having low strontium (lower than 10 ppm) by using barium carbonate or a clear barium chloride filtration and hydrochloric acid mixed under agitation at a maintained temperature and pH. The barium chloride is obtained as liquid phase and then crystallized through further processes.
摘要:
Significant amounts of soluble fluoride, known to create problems in processes requiring high quality grade calcium chloride, are removed from calcium chloride solution using hydroxyapatite as a removal mechanism. Under acidic conditions, calcium chloride solution is purified to about less than 10 ppm fluoride, significantly, to less than 1 ppm fluoride. At least 0.1 weight percent hydroxyapatite and concentrated hydrochloric acid are added to calcium chloride solution and slurried to remove fluoride and create a highly purified calcium chloride solution, substantially free of fluoride.
摘要:
CALCIUM AND SODIUM CHLORIDES ARE PRODUCED BY EVAPORATING THE DISTILLATION LIQUID RESULTING FROM THE AMMONIA SODA ASH PRODUCTION PROCESS. THIS LIQUID IS CLARIFIED AND INTRODUCED INTO THE EVAPORATORS TO MIX WITH A CONCENTRATED CALIUM CHLORIDE SOLUTION CONTAINED THEREIN, THE CONCENTRATION OF CALCIUM CHLORIDE IN SUCH A MIXED SOLUTION BEING MAINTAINED AT 28-45 WT. PERCENT. IN THE PROCESS ACCORDING TO THE METHOD DISCLOSED HEREIN, STEAM IS PASSED CONSECUTIVELY THROUGH ALL THE EVAPORATORS OF THE PLANT.
THE APPLICATION OF THE PROPOSED METHOD PRACTICALLY PRECLUDES THE FORMATION OF GYPSUM DEPOSITS ON THE HEATING SURFACES OF THE EVAPORATORS.
摘要:
Methods for utilizing waste products of the steel industry are provided that utilize spent pickle liquor to recover valuable alkaline earth metals from low value wastes with significant calcium content in the form of insoluble oxide, hydroxides, and/or salts are provided, as well as methods for generating a ferric oxide hydroxide composite from steel slag. Suitable raw materials include slag from steel manufacturing and ash from various operations. Ferric oxide hydroxide composite materials described herein can be used for removal of sulfur and metals from contaminated materials. Accordingly, compositions and methods of the inventive concept introduce considerable value to low value waste materials that would otherwise be discarded. In addition, compositions and methods of the inventive concept serve to reduce waste streams from industrial processes.
摘要:
Significant amounts of soluble fluoride, known to create problems in processes requiring high quality grade calcium chloride, are removed from calcium chloride solution using hydroxyapatite as a removal mechanism. Under acidic conditions, calcium chloride solution is purified to about less than 10 ppm fluoride, significantly, to less than 1 ppm fluoride. At least 0.1 weight percent hydroxyapatite and concentrated hydrochloric acid are added to calcium chloride solution and slurried to remove fluoride and create a highly purified calcium chloride solution, substantially free of fluoride.
摘要:
A purification method of a metal salt which comprises bringing a metal salt formed by melting an alkali metal salt, an alkaline earth metal salt or a mixture thereof into contact with titanium or the like, thereby adsorbing impurities in the metal salt, a deoxidization method by melting metallic calcium into a molten product of the metal salt purified by the purification method and bringing the same into contact with a titanium material, and a production method of the titanium material which comprises conducting molten salt electrolysis by using the molten product of the purified metal salt for an electrolytic bath. Using the purification or production method the molten metal salt can be purified simply and conveniently at good efficiency. Then, use of the purified metal salt can minimize contamination caused by the metal impurities in the molten salt and the titanium material of high quality can be produced.
摘要:
In a brine treatment method of removing sulfate ions from sulfate-ion contained brine, sulfate-ion contained brine is brought into dispersive contact with granular ion exchange resin carrying zirconium hydrous oxide thereon in a fluid state under an acidic condition to thereby cause the sulfate ions to be adsorbed by the ion exchange resin and removed from the brine, then the granular ion exchange resin is washed with aqueous solution whose pH value is equal to or lower than a pH value in the adsorbing step, thereby removing chloride ions from the granular ion exchange resin, then in a fluid state, the granular ion exchange resin adsorbing the sulfate ions is brought into dispersive contact with aqueous solution of pH value higher than the pH value in the adsorbing step, thereby desorbing the adsorbed sulfate ions from the granular ion exchange resin, and then the granular ion exchange resin is washed with water.
摘要:
A method of converting sodium bromide brine to ammonium bromide brine and optionally to calcium bromide is disclosed. The method involves introducing ammonia and carbon dioxide into the reactant brine, removing a resulting bicarbonate precipitate, driving off any excess ammonium carbonate, and optionally contacting with lime.