Preparation method of electronic grade manganous nitrate for tantalum capacitor

• Main Authors: WANG WENTAO, LI HUI, MI XIXUE, YAN GUOYUAN, WEN XINNING, WAN JUN, LI MINGYANG, DENG LIULIANG, XIE WEIPING, LU DONG, ZHENG PEISHENG
• Format: Patent
• Language: Chinese; English
• Published: 18.07.2012
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention relates to a preparation method of electronic grade manganous nitrate for a tantalum capacitor, which includes a. adding crushed and washed manganese metal into nitric acid, stirring the mixture while adding the manganese metal till the manganese metal is completely dissolved and then statically placing the mixture for 10 to 40 minutes; b. conducting coarse filtering on the solution, adjusting the pH value of the solution to be 2 to 4 through nitric acid; and c. heating the solution receiving acid adjustment in vacuum mode to condense the solution to the required ratio, adjusting the pH value of the solution through nitric acid to be 2-5, cooling the solution and conducting fine filtering on the solution to obtain a manganous nitrate solution product. The preparation method can be used for preparing liquid manganous nitrate products in batch in industrial mode to achieve using standard of electronic grade products for the tantalum capacitor. Manganese dioxide produced by the electronic grade man