Process and apparatus for reducing stannic oxide into metallic tin

A process for reducing stannic oxide into metallic tin, comprising following steps:

• step 1, establishing at least one electrolytic cell provided with an anode and a cathode;
• connecting the anode to a positive terminal of an electrolytic power supply, and connecting the cathode to a negative terminal of the electrolytic power supply;
• and feeding the stannic oxide and an electrolyte solution into the at least one electrolytic cell, such that the stannic oxide directly contacts the cathode or the metallic tin on the cathode during electrolysis;
• step 2, turning on the electrolytic power supply to initiate the electrolysis, wherein at the anode, an electrochemical oxidation reaction occurs to dissolve a soluble anode metal or allow evolution of chlorine and/or oxygen at an insoluble anode, and at the cathode, the stannic oxide in direct contact with the cathode and/or the stannic oxide in direct contact with the metallic tin on the cathode undergoes an electrochemical reduction reaction to produce the metallic tin;
• and
• step 3, collecting the metallic tin produced from the electrolysis and/or a solid product and/or a solution product of a tin compound produced from a reaction of the metallic tin with the electrolyte solution.