1. Putting some TiO2 into aluminum electrolyzer can make aluminum ingot produced by electrolysis containing low content titanium.

2. The maintenance of bipolar ion - exchange membrane electrolyzer during its operation is discussed.

3. Common diaphragm electrolyzer were revamping by activated cathode process and modified diaphragm process.

4. The problems in current increase of diaphragm electrolyzer and the countermeasures were introduced.

5. The selection of switch with load of different electrolyzer and its parameters were introduced.

6. The electrolyzer system calls for yield quick returns and small investment.

7. Galvanic cell type hydrogen sensors and fuel cells belong to the former, and hydrogen pump, steam electrolyzer and membrane reactors to the latter.

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8. The operation of DeNora 29 DD 350 ion - exchange membrane electrolyzer during the production are summarized.

9. Various possible problems arised in runing of monopolar type ion-membrane electrolyzer are analyzed thoroughly and the effective countermeasure are proposed.

10. Process, characteristics and parameters of refined brine by new process for ionic membrane electrolyzer were introduced.

11. The new setup, market situation and technical progress of ion - exchange membrane electrolyzer are described worldwide.

12. The structure of bipolar components of 38 DD 350 type ion - exchange membrane electrolyzer is introduced.

13. The process of acceptance brine by bittern of Ye county were introduced. Calculations showed that the concentration of secondary brine met the requirements of electrolyzer .

14. This paper describes the direct recovery of gold and silver from the thiourea and sulphuric acid eluate of the loaded resin elution by using electrowinning in the diaphragm electrolyzer.