Method for manufacturing graphite anode for electrolytic magnesium chloride

Abstract

The invention discloses a method for manufacturing a graphite anode, and particularly discloses a method for manufacturing a graphite anode which is formed by casting graphite block anodes in cast iron and is used for electrolytic magnesium chloride, and provides a method for manufacturing a graphite anode for electrolytic magnesium chloride, which is high in a finished product ratio and low in production cost. The method comprises the following steps of: 1) overlapping more than two graphite block anodes along the width direction to form a graphite assembly with a cast-in section, and reserving casting contraction joints between the two adjacent graphite block anodes; 2) sealing the casting contraction joints of the graphite block anodes of the cast-in section on the graphite assembly, and at least arranging protective layers on outer sides of the graphite block anodes of the cast-in section; 3) fixing the graphite block anodes, which are provided with the protective layers, of the cast-in section in a casting cavity; and 4) pouring molten iron into the casting cavity to cast the graphite block anodes of the cast-in section on the graphite assembly in the cast iron, crystallizingand cooling the molten iron, removing the casting cavity to form the graphite anode for the electrolytic magnesium chloride.

Description

technical field [0001] The invention relates to a method for manufacturing a graphite anode, in particular to a method for manufacturing a graphite anode for electrolytic magnesium chloride formed by casting the graphite anode into cast iron. Background technique [0002] At present, domestic electrolytic anode equipment used to electrolyze magnesium chloride to produce sponge titanium usually uses simple graphite block anodes or pure copper plate anodes. The main disadvantages of electrolyzing magnesium chloride to produce sponge titanium using the 110kA non-partition electrolytic cell technology of pure graphite block anode or copper plate anode are: the volume concentration of chlorine gas is low, which can only reach 60%; the power consumption per ton of magnesium is high, reaching 16350Kwh / ton; single cell The production capacity is low, and the return rate of the electrolytic chlorine gas to the chlorination furnace after compression is low. During the production proce...

AI Technical Summary

Problems solved by technology

The main disadvantages of electrolyzing magnesium chloride to produce sponge titanium with 110kA non-partition electrolytic cell technology using pure graphite block anode or copper plate anode are: low chlorine gas volume concentration, which can only reach 60%; high power consumption per ton of magnesium, reaching 16350Kwh / ton; single cell The production capacity is low, and the return rate of the electrolytic chlorine gas to the chlorination furnace after compression is low. During the production process, it is necessary to continuously replenish liquid chlorine gas into the chlorination furnace

Since the graphite anode is soft and brittle, when it is cast into cast iron, the problem to be solved is: after the casting is completed, it cannot be crushed due to the external force of the shrinkage of the molten iron.

At present, there is no such technology in China. In foreign countries, graphite block anodes are directly cast into cast iron, or several pieces of graphite anodes are spliced ​​together and then cast into cast iron. When the molten iron shrinks, part of the graphite anodes are crushed. , there will still be some graphite anodes, the result is that the yield is extremely low, the production cost is extremely high, and it cannot be popularized and applied in a large area

Images