| 摘要 |
<p>PURPOSE:To prevent the cracking of product nickel and to decrease electrolysis voltage by maintaining the temp. of the feed liquid which is the electrolyte discharged from an electrolytic cell and is to be returned to a cathode box after refining and cooling at a prescribed temp. or above in the initial period when the electrolysis is started. CONSTITUTION:In an electrolytic refining method of nickel wherein electrolysis is accomplished by using nickel matt as anode and maintaining the current density of cathode at >=1.5A/dm<2>, the temp. of the feed light for a cathode box in the initial period when the electrolysis is started is maintained at >=45 deg.C to reduce electrodeposition stress, whereby the craking to be generated in the stage of cutting electric nickel to product nickel as well as the cracking of the seed plate in speed plate electrolysis are prevented. The electrolysis voltage is decreased by an increase in the temp. of the electrolyte, whereby the cost of electric power for electrysis is reduced. The temp. of the feed liquid is maintained at >=45 deg.C, more preferably about 45-60 deg.C by allowing the reflux electrolyte in the initial period when the electrolysis is started to bypass a cooler partially or if necessary through a heater.</p> |
