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Production of high strength hydrochloric acid from calcium chloride feed streams by crystallization
The present relates to a method for producing calcium sulfate solid crystals and hydrochloric acid (HCl) from a calcium chloride solution comprising the steps of feeding a continuous stirred-tank reactor with a calcium chloride solution, sulfuric acid and water; mixing the calcium chloride solution, sulfuric acid and water in the reactor; and maintaining the reactor a temperature of less than about 70° C., converting the calcium chloride solution, sulfuric acid and water into HCl and calcium sulfate solid crystals. The method described herein can be incorporated as a means for regenerating HCl from CaCl2 solutions which are generated in the metallurgical industry when processing calcium-bearing ores for recovering metals like rare earth elements.
Production of high strength hydrochloric acid from calcium chloride feed streams by crystallization
The present relates to a method for producing calcium sulfate solid crystals and hydrochloric acid (HCl) from a calcium chloride solution comprising the steps of feeding a continuous stirred-tank reactor with a calcium chloride solution, sulfuric acid and water; mixing the calcium chloride solution, sulfuric acid and water in the reactor; and maintaining the reactor a temperature of less than about 70° C., converting the calcium chloride solution, sulfuric acid and water into HCl and calcium sulfate solid crystals. The method described herein can be incorporated as a means for regenerating HCl from CaCl2 solutions which are generated in the metallurgical industry when processing calcium-bearing ores for recovering metals like rare earth elements.
Production of high strength hydrochloric acid from calcium chloride feed streams by crystallization
DEMOPOULOS GEORGE (author) / FELDMANN THOMAS (author)
2017-10-10
Patent
Electronic Resource
English
IPC:
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C22B
PRODUCTION OR REFINING OF METALS
,
Gewinnen oder Feinen von Metallen
/
E04B
Allgemeine Baukonstruktionen
,
GENERAL BUILDING CONSTRUCTIONS
| European Patent Office | 2020
Hydrochloric acid recovery from rare earth chloride solutions by vacuum membrane distillation
| British Library Online Contents | 2006
Integral use of calcium chloride supplies high early strength
| Engineering Index Backfile | 1934
Hydrochloric acid recycling from chlorinated hydrocarbons
| British Library Conference Proceedings | 1994
Atmospheric scavenging of hydrochloric acid
| NTRS | 1975