发明名称 |
PROCEDE POUR EPURER LES SOLUTIONS USAGEES AQUEUSES D'ACIDE CHROMIQUE, ET SOLUTIONS AINSI EPUREES. |
摘要 |
A method for purifying aqueous chromic acid solutions containing unwanted metal cations, wherein a base is added to the purified solution to precipitate out the unwanted cations; the precipitate thereby formed is separated from the aqueous phase, and the solution thereby purified is recovered. The method is characterized in that the solution to be purified is a used solution having a chromic acid concentration of at least twenty-five grammes per litre (25 g/l), and in that the base is added while maintaining the solution in an acid medium.
|
申请公布号 |
FR2669323(A1) |
申请公布日期 |
1992.05.22 |
申请号 |
FR19900014594 |
申请日期 |
1990.11.16 |
申请人 |
ISOCHROME |
发明人 |
BENABEN PATRICK, ANDRE, RENE;POPAKUL JOSEPH;EMMANUEL JEAN-PIERRE;JOSEPH POPAKUL;JEAN-PIERRE EMMANUEL |
分类号 |
C02F1/52;C02F1/66;C02F9/00;C25D21/20 |
主分类号 |
C02F1/52 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|