Success Story: Longer lifetime of pH-electrodes with the Cleaning System EC 350e - METTLER TOLEDO
 

Success Story: Longer lifetime of pH-electrodes with the Cleaning System EC 350e

Service and the performance of the installed products were extremely satisfying for Lanzhou Jinchuan Metal Material Technology Co. Ltd., China
To achieve high-yield production of pure cobalt hydroxide, the pH-value has to be measured accurately and continuously. Lifetime of the pH-electrodes improved remarkably when regular cleaning took place.
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Lanzhou Jinchuan Metal Material Technology Co. Ltd., China
Lanzhou Jinchuan Metal Material Technology Co. Ltd. is a hi-tech chemical company producing cobalt oxide (Co3O4), a substance widely used in rechargeable batteries. This subsidiary company of Jinchuan Group Ltd., a large integrated, non- ferrous metallurgical and chemical engineering enterprise in Jinchang City, Gansu Province, P.R.China, employs nearly 300 workers. The output of nickel- and platinum-group metals together account for more than 90 % of the total production in China, and 1,200,000 tons of chemical products are manufactured by the Jinchuan Group Ltd. annually.

The application
The chemical process reaction presented itself as follows:

  • Co(NO3)2 + NaOH - Co(OH)2 + NaNO3
  • Temperature: 60…70 °C; 140…158 °F
  • Pressure: 1 bar; 14.5 psi
  • Batch time: 8 hours

As a key parameter, the pH must be adjusted by ammonia to a value of 8 to 9. Precision of pH measurement for the control system should be ±0.05. If the pH value is controlled incorrectly, then the quality of the end product becomes unacceptable due to characteristics such as poor degree of purity and different size of grain, accompanied by low yield……

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