CN-117101859-B - Purifying treatment method for returned scraps of titanium and titanium alloy

CN117101859BCN 117101859 BCN117101859 BCN 117101859BCN-117101859-B

Abstract

The present invention provides a method for pure purification treatment of titanium and titanium alloy return debris, integrating multiple pure purification treatment points and establishing a fully automated production line for titanium and titanium alloy return debris treatment. The treatment points specifically include crushing and screening, cleaning and rinsing, dehydration and drying, high-density sorting, oxide sorting, high-density sorting, manual selection, multi-stage magnetic separation, and fabric barrel loading. After treatment, qualified titanium and titanium alloy return debris that can meet the requirements of recycling and melting can be obtained. The method can be used to produce titanium and titanium alloy return debris that can be used as raw materials for melting, greatly reducing the production cost and energy consumption of titanium and titanium alloy materials. It can recycle national strategic precious metal resources and reduce energy consumption. It has important strategic significance for the consumption of rare mineral resources and carbon emissions.

Inventors

WANG BO
ZHAO PENGCHENG
CHE WEI
ZHANG PENG
HAN SONG
ZOU HONGMIN

Assignees

陕西天成航空材料有限公司

Dates

Publication Date: 20260508
Application Date: 20230512

Claims (1)

1. The purifying treatment method for the titanium and titanium alloy return scraps is characterized in that the specific operation flow is that after the titanium and titanium alloy scraps are recovered, the return scraps of high-purity titanium and titanium alloy ingots are prepared through the purifying treatment procedures of crushing and screening, cleaning and rinsing, dehydration and drying, high-specific gravity separation, three-stage magnetic separation, oxide separation, high-density inclusion removal and manual material selection; The method is implemented by the following steps: step 1, collecting returned scraps generated in the machining process of titanium and titanium alloy; step 2, arranging a magnetic separation point position at intervals of 1-2 working procedures after crushing and screening, wherein the purification treatment line is provided with five magnetic separation point positions in total, and the magnetic separation height of each stage of multi-stage magnetic separation is less than or equal to 100mm; step 3, crushing the collected returned scraps by a crusher, screening the scraps by a screening machine, and then carrying out primary magnetic separation to primarily remove magnetic inclusions, wherein the size range of the screened scraps is 2-50 mm; Step 4, washing and rinsing the crushed and sieved scraps, dehydrating and drying the scraps, and carrying out magnetic separation for the second time; The specific process parameters of the cleaning and rinsing are that the cleaning and rinsing temperature is 50-100 ℃, the rotating speed of the roller is 1-10rpm, the specific process parameters of the dehydration, namely the drying treatment are that the drying temperature is 250-350 ℃, and the moisture content of the scraps is within 300 ppm; Step 5, carrying out high specific gravity removal screening by a specific gravity machine, and carrying out third-stage magnetic separation, wherein the vibration frequency of the high specific gravity separation of the specific gravity machine is 10-50 Hz; step 6, oxide separation is carried out through a color selector, wherein the frequency of a feeding motor of the color selector is 250-350 Hz; step 7, removing high-density impurities through an X-ray sorting machine, wherein the foreign matter/background sensitivity of the X-ray sorting machine is 10-150 lux; And 8, setting 2-4 stations for manual material picking at the end of the purification treatment line, and carrying out fourth-stage and fifth-stage magnetic separation to obtain material distribution barrels.

Description

Purifying treatment method for returned scraps of titanium and titanium alloy Technical Field The invention belongs to the technical field of titanium and titanium alloy material processing, and relates to a purifying treatment method for returned scraps of titanium and titanium alloy. Background The titanium and titanium alloy processing material has the characteristics of long processing flow and low yield, and only 0.4-0.6 kg of titanium sponge enters into the finished product from titanium sponge to the processing material on average, so that a large amount of residue and waste materials are generated in the whole processing process; The European and American countries have been more than 30 years old with technology that returns to smelting titanium and titanium alloys, and the technology is mature and forms relevant standards and industry specifications, such as AMS 2380 in the United states and EN 2955 in Europe. The proportion of the additive return material is about 30% -50% when producing aviation titanium and titanium alloy in European and American countries, and the additive proportion is about 100% when producing civil titanium and titanium alloy. For example, 12,500 lbs (about 6 tons) of titanium and titanium alloy ingots may be produced by using near 100% return feed from company Perryman in the united states, while 13.2 tons of Ti-6Al-4V titanium and titanium alloy round ingots may be produced by using titanium chip mixed titanium sponge from company VDM in germany. However, the current domestic treatment technology for the titanium and titanium alloy returned materials has a large gap from abroad, the returned materials lack of reasonable management means, the residual titanium materials are polluted due to lack of scientific management in the production process of the residual titanium materials, and the storage and the transportation are disordered, so that the residual titanium materials are difficult to be used for high-end titanium material products or difficult to flow into a titanium production chain again in the later period. The purification treatment of the titanium and titanium alloy return materials is a key precondition for smelting titanium and titanium alloy cast ingots by using the return materials. Disclosure of Invention The invention aims to provide a purifying treatment method for returned scraps of titanium and titanium alloy, which solves the problem of difficult recovery of titanium scraps in the prior art. The technical scheme adopted by the invention is that the method comprises the specific operation flow of recovering the titanium and titanium alloy scraps, and preparing the high-purity returned scraps of the titanium and titanium alloy ingots through the pure purification treatment procedures of crushing and screening, cleaning and rinsing, dewatering and drying, high specific gravity separation, three-stage magnetic separation, oxide separation, high-density inclusion removal and manual material picking. The invention is also characterized in that: the purifying treatment method for the returned scraps of titanium and titanium alloy comprises the following steps: step 1, collecting returned scraps generated in the machining process of titanium and titanium alloy; step 2, arranging one magnetic separation point at intervals of 1-2 working procedures after crushing and screening, and setting five magnetic separation points in the purification treatment line; Step 3, crushing the collected returned scraps by a crusher, screening the scraps by a screening machine, and then carrying out primary magnetic separation to primarily remove magnetic inclusions; Step 4, washing and rinsing the crushed and sieved scraps, dehydrating and drying the scraps, and carrying out magnetic separation for the second time; Step 5, carrying out high specific gravity removal screening by a specific gravity machine, and carrying out third-stage magnetic separation; step 6, separating oxides by a color sorter; Step 7, removing high-density inclusions through an X-ray separator; Step 8, setting 2-4 stations at the end of the purification treatment line to carry out manual material picking, and carrying out fourth-stage and fifth-stage magnetic separation to carry out material distribution barreling; wherein the magnetic separation height of each stage of the multi-stage magnetic separation in the step2 is less than or equal to 100mm; wherein the length range of the size of the screening scraps in the step 3 is 2-50 mm; The specific process parameters of the cleaning and rinsing in the step 4 are three times of cleaning and three times of rinsing, the cleaning and rinsing temperature is 50-100 ℃, and the rotating speed of the roller is 1-10rpm; the specific process parameters of the dehydration, namely the drying treatment in the step 4 are that the drying temperature is 250-350 ℃, and the moisture content of the scraps is within 300 ppm; wherein the high specific gravity separation vibration