| Based on extensive literature review and the summarization of Guanlu Aluminum Co. Ltd.'s practice on its 75kA prebaked cells (called as GL75kA cells) , the problem about cell life was discussed in details in this paper. With the purpose of prolonging the cell life and saving the energy used in the production process, a technique called "ambient-temperature-cured TiB2 cathode coating (ATCTCC)" was tested on GL75kA cells.(1) Several main factors affecting the cell life ,such as cells design, the materials for cell installation, the quality of cell installation and the production management were analyzed and discussed and then further studies on technical measures to prolong the cell life of GL75kA cell were carried out.(2) An application test of ATCTCC was first carried out on GL75kA cells. The test results showed that: (a) the preparation of ATCTCC was very simple and its price was low; (b) the coating could not shelled off from the cathodic carbon blocks and, according to the measurements of Ti concentration in the liquid aluminum, the life of the coating could maintain more than 40 months; (c) during the preheating and starting-up stage of the cells, the intensive penetration of sodium and electrolyte wasreduced and, therefore, the swelling stress could be decreased and the cell life could be prolonged; (d) with the application of ATCTCC, the uniformity of temperation distribution in the cathodes during the coke-preheating process was improved; the electrolytic process became more stable and controllable and abnormal voltage and noises decreased markedly; (e) compared with the contrast cells, the cells with ATCTCC had lower ohmic voltage drop (lowered by 11.5mV averagely), higher current efficiency (increased by 3.14 percents averagely) and lower energy consumption (reduced by 549mV averagely) .
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