Citric Acid → Sodium Hydroxide

A cobalt sulfate solution (2 mol/L) and sodium hydroxide solution (5 mol/L) were prepared respectively. To the cobalt sulfate solution, citric acid was added. The resultant mixture and the sodium hydroxide solution were simultaneously added into a reactor by a cocurrent method, and the reaction mixture was allowed to react at 50° C. The pH value was measured at 11. Oxygen was charged uniformly as an oxidant, and the amount thereof was 1.2 times that needed for completely oxidizing the generated cobalt hydroxide. After reaction completion, the solution was aged for 10 hrs at a constant temperature, dried at 110° C., and roasted at 350° C. for 10 hrs to yield spherical tricobalt tetraoxide with diameter D50 of 8.1 μm and tap density of 2.3 g/cm3.

1. customto react at 50° C
2. customAfter reaction completion
3. customdried at 110° C.
4. waitroasted at 350° C. for 10 hrs

ORDレコード

ord-31c44bbf29594d1f8806142dfc2a966a

出典データセット

uspto-grants-2011_08

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07998452B2