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Method for preparing high-purity titanium by electrolyzing titanium scraps in molten salt

A molten salt, high-purity technology, applied in the field of electrochemical metallurgy, can solve the problems of difficult to reflect the actual value of metal titanium, cheap products, and high requirements for the composition of waste titanium elements, so as to achieve mature electrolysis process, improve recovery value, and efficiently recover The effect of using

Inactive Publication Date: 2017-06-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two methods have high requirements on the composition of waste titanium elements, and the recovered products are relatively cheap, which makes it difficult to reflect the actual value of titanium metal.

Method used

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  • Method for preparing high-purity titanium by electrolyzing titanium scraps in molten salt

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Experimental program
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Effect test

Embodiment 1

[0026] Use waste titanium such as car chips and shavings as the titanium source, and press it in the mold with a pressure of 10Mpa to obtain a 20mm thick, 100mm wide, and 500mm long block as the anode; take a 10mm thick, 100mm wide, and 500mm long nickel plate as the cathode ; The eutectic salt of anhydrous lithium chloride and potassium chloride is used as the electrolyte, and a low-priced titanium ion source is added to the molten salt through the reaction of metal titanium and titanium tetrachloride. Under the protection of argon, the electrolysis is carried out by means of constant current electrolysis, and the current density is controlled at 1A / cm 2 about. After 10 hours of electrolysis, the electrolysis was stopped, and the electrode was taken out from the molten salt. After the furnace temperature drops to 100°C, remove the cathode, wash with water to remove salt inclusions, then wash with 1mol / L dilute hydrochloric acid, and finally rinse with water and dry at 60°C t...

Embodiment 2

[0028] The titanium alloy parts scrapped by automobiles are used as the source of titanium ions. After being cut and broken, they are placed in a copper frame as the anode; the cathode is made of stainless steel plate; the electrolyte is a mixture of molten sodium chloride and potassium chloride containing low-priced titanium ions. crystal salt. Under the protection of an inert atmosphere, the furnace body was heated to 800°C, and after 1 hour of heat preservation, the cathode and anode were inserted into the molten salt and electrolyzed at a constant potential with a parameter of 0.2V / cm. After 10 hours of electrolysis, the electrode was taken out, and the temperature was lowered to 60°C. Then the cathode is taken out, washed with water, pickled, washed with water and dried, and finally the obtained high-purity titanium crystal is melted in an electron beam melting furnace to obtain a 4N grade high-purity titanium ingot.

Embodiment 3

[0030] Use waste titanium metal parts as titanium ion source, connect it to stainless steel electrode rod as anode; use nickel plate as cathode; electrolyte is eutectic salt of molten sodium chloride, potassium chloride and lithium chloride containing low-valent titanium ions. Under the protection of an inert atmosphere, the furnace body was heated to 700 ° C, and after 1.5 hours of heat preservation, the cathode and anode were inserted into the molten salt and electrolyzed at a constant potential with a parameter of 0.3V / cm. After 20 hours of electrolysis, the electrode was taken out, and the temperature was lowered to 20°C. Then the cathode is taken out, washed with water, pickled, washed with water and dried, and finally the obtained high-purity titanium crystal is melted in an electron beam melting furnace to obtain a 4N grade high-purity titanium ingot.

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Abstract

The invention relates to a method for preparing high-purity titanium by electrolyzing titanium scraps in molten salt, and belongs to the field of metallurgical electrochemistry. The method comprises the process steps of removing contaminants from the surface of titanium scraps through degreasing treatment, magnetic field treatment, etc.; placing the titanium scraps pretreated in an anode material box or making the titanium scraps into anode blocks with certain strength through die treatment; taking inorganic halide molten salt containing low-valent titanium ions as electrolytes and metallic nickel or iron as a cathode for electrolysis; pickling and washing cathode products upon completion of electrolysis to obtain 3N-5N high-purity titanium. The method provided by the invention has the features of simple operation, low cost, simple equipment, high recovery rate of the titanium scraps. Titanium elements in all kinds of titanium scraps or titanium alloy can be recycled effectively, and converted into the high-purity titanium with high value added.

Description

technical field [0001] The invention relates to a method for preparing high-purity titanium by electrolyzing waste titanium in molten salt, which belongs to the field of electrochemical metallurgy and can specifically realize the recovery of waste titanium and convert it into high-purity titanium with higher added value. Background technique [0002] In recent years, metal titanium has received more and more attention because of its excellent physical and chemical properties. However, due to the rapid development of the titanium industry, the problem of waste titanium has become increasingly prominent. Usually, about 10-20wt% of waste materials can be produced in the machining process of titanium metal, and the waste titanium caused by the decommissioning of civilian or military products made of titanium metal or titanium alloy is even more difficult to count. On the other hand, due to the limitation of smelting methods, titanium is still an expensive metal at present, so th...

Claims

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Application Information

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IPC IPC(8): C25C3/28
CPCC25C3/28
Inventor 焦树强焦汉东田栋华
Owner UNIV OF SCI & TECH BEIJING
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