Method of producing titanium metal with titanium-containing material
A method of producing titanium metal with titanium-containing material which includes mixing, pressing and drying the titanium-containing material with a carbonaceous reducing agent to obtain a resultant as a first anode. Using a metal or an alloy as a first cathode, and using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a first electrolyte to constitute a first electrolysis system, to perform pre-electrolysis in an inert atmosphere to obtain a residual anode. After the residual anode is washed, molded and dried, using the residual anode as a second anode, using a metal or an alloy as a second cathode, using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a second electrolyte to constitute a second electrolysis system, to perform electrolysis in an inert atmosphere to obtain titanium metal powder.
1. A method of producing titanium metal from titanium-containing material, characterized in comprising:
mixing the titanium-containing material with a carbonaceous reducing agent;
pressing the mixture to directly form a first anode without performing a reaction under a vacuum or high temperature, and drying the first anode;
using a metal or an alloy as a first cathode;
using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a first electrolyte to constitute a first electrolysis system, performing pre-electrolysis in inert atmosphere to remove impurity elements and obtain a residual anode;
washing and drying the residual anode, crushing the residual anode, mixing the crushed residual anode with a carbonaceous reducing agent to adjust a number ratio of oxygen atoms and carbon atoms in an elementary mixture forming a second anode and control the number ratio within 2:1-1:1, and molding the crushed residual anode to directly form the second anode without performing a reaction under a vacuum or high temperature;
using a metal or an alloy as a second cathode, using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a second electrolyte to constitute a second electrolysis system; and
performing electrolysis using the second anode in inert atmosphere to obtain titanium metal powder.
2. The method of claim 1 , wherein the carbonaceous reducing agent is at least one of coal powder, coke powder, activated carbon, graphite, carbon black and petroleum coke.
3. The method of claim 1 , wherein the titanium-containing material is high titanium slag or rutile.
4. The method of claim 1 , wherein the titanium-containing material and the carbonaceous reducing agent have particle sizes that can go through 200-mesh screen.
5. The method of claim 1 , wherein in the first anode, a number ratio of oxygen atoms in the titanium-containing material and carbon atoms in the carbonaceous reducing agent is 2:1-1:1.
6. The method of claim 1 , wherein the first cathode and the second cathode are carbon steel rod, molybdenum rod or titanium rods.
7. The method of claim 1 , wherein the electrolysis of the second electrolysis system comprises controlling current density of the second anode within 0.025 A/cm2-0.75 A/cm2 and controlling current density of the second cathode within 0.1 A/cm2-2 A/cm2.
8. The method of claim 1 , wherein the second electrolyte further contains low-valent titanium ions.
9. The method of claim 1 , wherein the carbonaceous reducing agent is at least one of coal powder, coke powder, activated carbon, graphite, carbon black and petroleum coke.
10. The method of claim 1 , wherein the titanium-containing material and the carbonaceous reducing agent have particle sizes that can go through 200-mesh screen.