The method for purifying titanium rods and titanium alloy residues

I. Handling of Powdered Residues
The processing flow for powdered residues is as follows: Residual titanium powder - crushing - cleaning - drying - screening - removing high-density metal inclusions - distribution - inspection - packaging and storage. The crushing of the powder can be done using a human-shaped gear twin-roller crusher or a hammer crusher. Cleaning is carried out on a cleaning machine. A hot air dryer or an electric heating dryer is used to dry the cleaned titanium powder. Screening of the powder is done in a double-hole sieve. After screening, the powder is first separated by an air separator and then processed by a strong magnetic separator to remove high-density metal inclusions (such as alloy blades mixed in the titanium powder). The distribution of the powder is carried out on a distribution machine to ensure uniform distribution of the materials and geometric dimensions. The powdered residues that have been purified and inspected to be qualified are returned to the furnace.

II. Handling of Block Residues
The processing flow for block residues is as follows: Block residues - grade identification - cutting to a certain length - removing surface contamination layer - inspection - packaging and storage.
(1) Grade identification. Block residues are identified using eddy current conductivity meters, steel inspection mirrors, mobile direct spectrometers, etc. They can quickly distinguish pure titanium and alloys, and determine the elements contained in the gold residues. The mobile direct reading spectrometer can also directly and accurately measure the content of impurities.
(2) Cutting to a certain length. This is done using shearing machines, crocodile clips, etc. or by burning and self-cutting.
(3) Surface oil stains and FeM on plates and tubes can be treated using alkaline washing or ultrasonic cleaning machines. Oxidation layers and contaminants on forged blocks and other surfaces can be treated using acid washing or shot blasting machines.

III. Recycling and Utilization Methods of Titanium Rods and Titanium Alloys as Return Furnace Materials
Vacuum Self-Dissolving Arc Furnace Melting Recovery
Generally, it is necessary to prepare electrodes with a certain strength to prevent blockage during the melting process. The four commonly used electrode preparation methods are: (1) Mix powdered returned furnace residues or small-sized block returned furnace residues with sponge titanium and alloy elements, and press them into electrode blocks on an oil press machine, then weld them into self-dissolving electrodes. This is the most commonly used method for vacuum self-dissolving arc furnace recovery of returned furnace residues. The addition ratio of returned furnace residues can reach 40%.
(2) Use residues of the same grade to bundle them into self-dissolving electrodes and the addition amount of returned furnace residues can reach 100%.
(3) Use electrode blocks as the core material and bundle a certain proportion of plate and tube returned furnace residues around them to form self-dissolving electrodes. The addition amount of returned furnace residues can reach up to 80%.
(4) Use the same-grade and same-specification ingot risers to be plasma argon arc welded into self-dissolving electrodes. The utilization rate of returned furnace residues is 100%.