Method for manufacturing calcium borate from ulexite

Method for manufacturing calcium borate from ulexite

The present invention provides the process of producing calcium borate with natrocalcite. Natrocalcite mineral powder as main material, and hydrochloric acid and lime as decomposing agent in the molar ratio among Na2O, CaO and HCl of 1 to 0.9-1.6 to 0.9-1.1 are reacted at temperature lower than 50 d...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: DESHENG,CONG HU
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:The present invention provides the process of producing calcium borate with natrocalcite. Natrocalcite mineral powder as main material, and hydrochloric acid and lime as decomposing agent in the molar ratio among Na2O, CaO and HCl of 1 to 0.9-1.6 to 0.9-1.1 are reacted at temperature lower than 50 deg.c under stirring for 2-9 hr and pH 9-13; and the product is processed through filtering, washing and drying to produce calcium borate powder containing B2O3 in 39.0-42.5 wt% and Na2O less than 0.5 wt%. The present invention has once B yield as high as 96-99.2 % under the condition of no recovery and utilization of concentrated liquid.