Method for crushing and removing impurities from bottom skin of sponge titanium weight

Abstract

The invention relates to the technical field of waste resourceful treatment, in particular to a sponge titanium weight bottom skin crushing and impurity removing method which comprises the following steps of peeling, bottom skin brake cutting, water jet cutting and crushing, acid leaching and impurity removing, ultrasonic cleaning, argon drying and screening and recycling. The bottom skin is crushed into small-granularity particles by adopting a cross grid water jet cutting technology, metal impurities such as Fe and Ni are removed in combination with acid leaching treatment, residual impurities are removed through multi-stage ultrasonic cleaning, oxidation discoloration is avoided through argon atmosphere drying, and meanwhile water jet sand is recycled; in the process, key indexes such as brake cutting pressure, cutting parameters, acid leaching time and ultrasonic frequency are accurately controlled through a quantification formula. The method effectively solves the problems that equipment is easy to damage during crushing and impurities are difficult to remove in a traditional process, remarkably improves the grade of bottom leather materials, widens the downstream application range, improves the resource utilization rate and economic benefits, and is suitable for industrial batch production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste resource processing, in particular to a method for breaking and impurity removal of titanium sponge kiln bottom skin. BACKGROUND

[0002] Titanium sponge is the core raw material of titanium processing materials, which is mainly produced through reduction and distillation processes and is ejected from the reactor in the form of titanium kiln. Complete titanium kiln needs to be processed by peeling and cutting bottom to realize the classification and sale of qualified products, substandard products and waste materials. The bottom skin material has significant processing problems due to the special production environment.

[0003] The bottom of the titanium kiln directly contacts the reactor active bottom during production, and metal impurities and chlorides are easily deposited and adsorbed there, resulting in high impurity content, high hardness and high density of the bottom skin material, which becomes one of the main waste materials in titanium sponge production. In the traditional process, due to the hardness of the bottom skin far exceeding that of the conventional titanium sponge material, the existing crushing equipment cannot crush it to a small particle size, and forced crushing can easily cause serious wear and even damage to the cutting knife, resulting in high maintenance cost and low production efficiency.

[0004] At present, the industry generally uses a gate cutting machine to cut the bottom skin into large pieces, without further crushing and impurity removal treatment, and directly sells it as waste titanium. Due to the problems of large particle size and complex impurity composition, the downstream application scenarios are extremely narrow, and the market acceptance is low. Its sales price is only 30%-50% of that of the qualified titanium sponge, the resource value is seriously underestimated, and a large amount of titanium resources is wasted.

[0005] At the same time, the traditional crushing and cutting process also has many drawbacks. A large amount of dust and noise is generated during the cutting process, which not only pollutes the production environment but also endangers the health of the operators. The high temperature generated during cutting can easily cause the titanium sponge to discolor, further reducing the product quality. The chlorides, Fe, Ni, Cr and other impurities contained in the bottom skin are difficult to remove effectively by conventional treatment methods, further limiting the grade improvement of the bottom skin material. Therefore, the existing titanium sponge bottom skin treatment technology has the problems of crushing difficulty, incomplete impurity removal, low resource utilization rate and serious environmental pollution, and an efficient and environmentally friendly crushing and impurity removal method is urgently needed to solve the industry dilemma. SUMMARY

[0006] The purpose of the present application is to provide a method for breaking and impurity removal of titanium sponge kiln bottom skin to solve the problems of high hardness, crushing difficulty, high impurity content and low sales price of the existing titanium sponge bottom skin mentioned in the background.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A method for breaking and impurity removal of titanium sponge kiln bottom skin, comprising the following steps:

[0009] S1, the produced titanium sponge titanium balance is stripped, and the high iron alloy brightening material around and on the top is stripped;

[0010] S2, the bottom skin part of the titanium balance is cut off by a gate cutting machine to obtain a large piece of bottom skin material;

[0011] S3, the large piece of bottom skin material is broken into small particle size titanium sponge by a water jet cutting device in a cross grid cutting mode, the cutting gap is set as D, and the formula D=20mm×(1±k) is met, wherein k is a cutting accuracy correction coefficient, and the value range is 0-0.1;

[0012] S4, the broken titanium sponge bottom skin particles are put into an acid leaching device for acid leaching treatment, and the acid leaching time T meets the algorithm T=10h×(C / C0), wherein C is the actual acid leaching liquid concentration, and C0 is the standard acid leaching liquid concentration 12%;

[0013] S5, after the acid leaching is completed, the titanium sponge bottom skin particles are cleaned by multi-stage ultrasonic cleaning until the water solution conductivity σ after cleaning is less than or equal to 20.0 μS / cm;

[0014] S6, the cleaned titanium sponge is dried under the protection of an argon atmosphere, and the drying time t meets t=(5-10)min / t0, t0 is the unit mass of titanium sponge, and the value is 1000 kg;

[0015] S7, the dried titanium sponge is screened to separate titanium sponge particles and mixed fine powder;

[0016] S8, the mixed fine powder is screened again, and the water jet sand and titanium fine powder are separated according to the particle size difference, the separated water jet sand is returned to the water jet cutting process for recycling, and the titanium fine powder is collected and treated separately.

[0017] As preferred, in step S1, the stripping treatment adopts a pneumatic pick or a hydraulic stripping device, the stripping thickness h meets h≥5mm, and the surface roughness Ra of the stripped titanium balance is less than or equal to 3.2 μm. By defining the stripping thickness and surface roughness standards, the surface high iron alloy impurities can be completely removed, the product quality is not affected by the residual impurities in the subsequent process, and the titanium balance surface flatness is ensured, thereby providing a stable processing basis for the subsequent gate cutting process.

[0018] As preferred, in step S2, the cutting thickness d of each cutter of the gate cutting machine meets 10mm≤d≤20mm, the total cutting thickness H of the bottom skin meets 30mm≤H≤60mm, and the gate cutting pressure P1=25MPa×(H / 45mm) during the cutting process, wherein H is the actual cutting thickness of the bottom skin. By accurately controlling the cutting thickness and pressure, the waste of material caused by excessive cutting thickness is avoided, the bottom skin is not broken unevenly caused by improper pressure, the complete separation of the bottom skin is ensured, and the processing efficiency of the subsequent water jet cutting is improved.

[0019] Preferably, in step S3, the nozzle size d0 of the waterjet cutting device satisfies 0.2mm≤d0≤0.4mm, the cutting pressure P2 satisfies 300MPa≤P2≤350MPa, the waterjet abrasive is made of garnet with a particle size of 80-100 mesh, and the waterjet abrasive recycling rate η≥85%, where η=(recycled waterjet abrasive mass / initial input waterjet abrasive mass)×100%. Specific parameters combined with garnet waterjet abrasive can improve cutting efficiency and reduce equipment wear. The high recycling rate reduces consumable costs and avoids environmental pollution caused by waterjet abrasive waste.

[0020] As a preferred option, in step S3, the cutting distance L of the cross grid cutting is 0.4mm×(D / 20mm), where D is the actual value of the cutting gap. During the cutting process, the water flow velocity v≥200m / s. Through the linkage algorithm of cutting distance and gap, the uniform particle size of the cutting particles is ensured. High-speed water flow can enhance the cutting penetration force, solve the problem of high hardness of the bottom skin and difficulty in breaking it, and at the same time reduce cutting dust and noise.

[0021] Preferably, in step S4, the leaching solution is an HCl solution with a concentration of 10%-15%, and the amount of leaching material m in each batch satisfies 3t≤m≤4t. The liquid-to-solid ratio of the leaching solution to the material is R=5:1 (mL / g), and the stirring speed during the leaching process is ω=60r / min×(m / 3.5). The reasonable liquid-to-solid ratio and stirring speed algorithm can ensure that the leaching solution and the material are in full contact, improve the removal efficiency of metal impurities such as Fe and Ni, and the fixed batch quantity can optimize the production rhythm and avoid equipment idleness due to incomplete impurity removal caused by too much material or too little material.

[0022] Preferably, the ultrasonic cleaning is performed 3-4 times, with each cleaning time t1 satisfying 20min≤t1≤30min. The ultrasonic frequency f=250kHz×(σ0 / σ), where σ0 is the initial conductivity of the cleaning solution and σ is the target conductivity of 20.0μS / cm. By adjusting the ultrasonic frequency in conjunction with the conductivity, residual Cl ions and impurities from acid leaching can be removed in a targeted manner. Multi-stage cleaning combined with precise frequency control ensures the cleaning effect while avoiding energy waste caused by over-cleaning. At the same time, conductivity detection can quickly determine the cleaning quality and improve production efficiency.

[0023] Preferably, in step S6, the temperature of the drying equipment is T1 = 120℃ × (t / 7.5min), where t is the actual drying time, the argon gas flow rate is Q = 0.5m³ / h × t0, and t0 is the unit mass of sponge titanium, which is taken as 1 ton. The oxygen content is controlled at ≤0.1% during the drying process. The linkage control of temperature and time can achieve rapid and uniform drying. Argon gas protection combined with low oxygen content control can effectively avoid discoloration and quality degradation caused by the reaction of sponge titanium with air, and ensure the product yield and grade.

[0024] As a preferred option, in step S7, a 0.83mm screen is used for screening, and the screening pass rate θ of the sponge titanium particles is ≥90%, where θ = (mass of particles on the screen / total mass of dried material) × 100%. The clear screen specifications and pass rate standards can accurately separate qualified particles from fine powder, ensure product particle size consistency, meet the diverse needs of downstream applications, and enhance the product's market competitiveness.

[0025] As a preferred embodiment, in step S8, the separation of mixed fine powder is carried out using a 0.2mm sieve, and the water jet sand separation recovery rate φ≥90%, where φ=(mass of water jet sand after separation / total mass of water jet sand in mixed fine powder)×100%, and the impurity content in the separated titanium fine powder is ≤0.5%. The high recovery rate design enables the recycling of water jet sand, reduces production costs, strictly controls the impurity content of titanium fine powder, and ensures basic sales value even as a by-product, further improving the overall economic benefits of production.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention employs waterjet cutting technology, combined with a cross-grid cutting method and precise parameter control. This not only successfully breaks large pieces of base material into uniform small particles, solving the problem of breaking hard base material, but also avoids the high wear and tear issues of traditional cutting equipment. Simultaneously, the cooling and buffering effect of the water jet during cutting effectively reduces cutting noise and dust generation, improving the production environment. Compared to the traditional method of directly selling the cut base material as scrap titanium, this significantly enhances the processing feasibility and subsequent utilization value of the base material.

[0028] 2. This invention significantly improves the grade and product quality of sponge titanium substrate through a multi-stage synergistic impurity removal design. The cutting stage utilizes the water-jet cutting method, leveraging the water solubility of chlorides, to achieve initial impurity removal. The acid leaching process employs a concentration-time-linked control algorithm to precisely remove metallic impurities such as Fe and Ni, while optimized stirring parameters ensure uniform and thorough impurity removal. Subsequent multi-stage ultrasonic cleaning, combined with conductivity testing standards, completely removes residual impurities from the acid leaching process, preventing the impact of Cl ions and other contaminants on product quality. This multi-step, progressive impurity removal design significantly reduces the impurity content in the substrate material, effectively solving the problem of low product grade caused by difficult impurity removal in traditional processes, and enabling substrate material that was originally waste titanium to meet the standards for qualified sponge titanium.

[0029] 3. This invention possesses highly efficient resource recycling capabilities, significantly reducing production consumption and costs. The garnet waterjet abrasive used in waterjet cutting achieves efficient recycling through two-stage screening, with a recycling rate exceeding 85%, reducing one-time investment in consumables. The acid leaching and cleaning processes, through batch optimization and precise parameter control, avoid acid waste and energy consumption caused by over-cleaning. Even the titanium fine powder separated by screening ensures its basic utilization value through strict impurity control, maximizing material utilization. Resource recycling design and energy consumption optimization effectively reduce the production cost per unit product, improving the overall economic efficiency and environmental friendliness of the production process.

[0030] 4. The process design of this invention possesses high stability and operability, adapting to the needs of industrialized mass production. Process parameters at each stage are quantitatively controlled through clearly defined formulas and algorithms. Key parameters such as gate cutting pressure, ultrasonic frequency, and drying temperature are linked to core indicators, ensuring consistency and stability across different batches. Control standards for each step are clear and quantifiable; for example, indicators such as surface roughness, conductivity, and oxygen content have explicit testing standards, facilitating quality control and process optimization during production. Furthermore, the equipment and operating procedures employed in this process conform to industrial production scenarios, enabling practical application without the need for specially customized equipment. This balances technological advancement with practical production use, providing a replicable and scalable solution for the efficient processing of sponge titanium substrates. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are explained in detail together with the embodiments of the invention, but do not constitute a limitation thereof.

[0032] Figure 1 This is a flowchart of the present invention;

[0033] Figure 2 This is a comparative analysis diagram of the sponge titanium treatment process parameters in embodiments of the present invention;

[0034] Figure 3 This is a comparative analysis diagram of the sponge titanium treatment process effects in embodiments of the present invention;

[0035] Figure 4 This is a graph showing the variation trend of sponge titanium processing parameters in an embodiment of the present invention. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Peeling process: The produced sponge titanium ingots are peeled using a pneumatic pick, removing the high-iron alloy bright material from the sides and top. The peeling thickness is controlled at h=5mm. After peeling, the surface roughness of the titanium ingot is Ra=2.8μm, which meets the standard of Ra≤3.2μm.

[0039] Gate cutting of the bottom skin: The bottom skin of the titanium weight is removed using a hydraulic gate cutting machine. The cutting thickness of each cut is set to d=10mm, and the total thickness of the bottom skin removed is H=30mm. According to the formula P1=25MPa×(H / 45mm), the gate cutting pressure P1=16.7MPa is calculated. After cutting, the bottom skin material is collected separately.

[0040] Waterjet cutting and crushing: Large pieces of bottom material are transferred to the waterjet cutting device, using a cross-grid cutting method. The cutting gap is set to D = 20mm × (1 + 0) = 20mm (k is set to 0), the cutting distance is L = 0.4mm × (20mm / 20mm) = 0.4mm, and the water flow velocity is controlled at v = 200m / s. The nozzle size is selected as d0 = 0.2mm, the cutting pressure is P2 = 300MPa, and the waterjet abrasive is 80-mesh garnet. After cutting, the particles and fine powder are separated through a 0.83mm sieve. The calculated waterjet abrasive recycling rate η = 86%.

[0041] Acid leaching treatment: The sponge titanium base particles are put into the acid leaching device. The material quantity for each batch is m=3 tons. A HCl solution with a concentration of C=10% is used as the acid leaching solution. The acid leaching solution is injected at a liquid-to-solid ratio of R=5:1 (mL / g). According to the algorithm T=10h×(C / C0)=10h×(10% / 12%)≈8.3h, the acid leaching time is set to 8h. At the same time, the stirring speed is controlled according to ω=60r / min×(m / 3.5)=60r / min×(3 / 3.5)≈51.4r / min.

[0042] Ultrasonic cleaning: After acid leaching, the particles are placed in an ultrasonic cleaning device. The initial conductivity of the cleaning solution is... =120μS / cm, according to f=250kHz×( / The ultrasonic frequency was set to 250kHz × (120 / 20) = 1500kHz. The cleaning was performed 3 times, with each cleaning time t1 = 20 minutes. After the last cleaning, the conductivity of the aqueous solution was measured to be σ = 18 μS / cm, which meets the qualified standard.

[0043] Argon drying: The cleaned and qualified sponge titanium is transferred to the drying equipment. The drying time is set to 15 minutes according to t=5min / t0 (t0=1 ton). The drying temperature is controlled according to T1=120℃×(t / 7.5min)=120℃×(15 / 7.5)=240℃. At the same time, argon gas is introduced according to Q=0.5m³ / h×t0 to control the oxygen content to 0.08% during the drying process.

[0044] Screening process: After drying, the particles are screened through a 0.83mm sieve. The calculated screening rate of sponge titanium particles is θ=92%. The separated mixed fine powder is screened again through a 0.2mm sieve. The water jet sand separation recovery rate is φ=91%. The impurity content of the separated titanium fine powder is 0.4%.

[0045] The data for this embodiment is shown in the table below:

[0046]

[0047] Example 2

[0048] Peeling process: A hydraulic peeling device is used for peeling, with a peeling thickness of h=6mm. After peeling, the surface roughness of the titanium ingot is Ra=3.0μm, which meets the requirement of Ra≤3.2μm.

[0049] Gate cutting of bottom skin: The thickness of each cut by the gate cutting machine is d=15mm, the total thickness of bottom skin removed is H=45mm, the gate cutting pressure is P1=25MPa×(45mm / 45mm)=25MPa, and the bottom skin material is collected separately after cutting.

[0050] Waterjet cutting and crushing: The cutting gap is set to D = 20mm × (1 + 0.05) = 21mm (k is taken as 0.05), the cutting distance is L = 0.4mm × (21mm / 20mm) = 0.42mm, and the water flow velocity is v = 220m / s. The nozzle size is selected as d0 = 0.3mm, the cutting pressure is P2 = 320MPa, and the waterjet abrasive is 90-mesh garnet material. After cutting, it is separated through a 0.83mm sieve, and the waterjet abrasive recycling rate is η = 88%.

[0051] Acid leaching treatment: The amount of acid leaching material per batch is m=3.5 tons, the acid leaching solution is HCl solution with a concentration of C=12%, the acid leaching time is T=10h×(12% / 12%)=10h, the stirring speed is ω=60r / min×(3.5 / 3.5)=60r / min, and the acid leaching solution is injected at a liquid-to-solid ratio of R=5:1.

[0052] Ultrasonic cleaning: The initial cleaning fluid conductivity σ0 = 150 μS / cm, the ultrasonic frequency f = 250 kHz × (150 / 20) = 1875 kHz, the cleaning was performed 4 times, the cleaning time for each time was t1 = 25 min, and the conductivity after the last cleaning was σ = 15 μS / cm, which met the qualified standard.

[0053] Argon drying: drying time t = 7.5 min / t0, total drying time is 26.25 min, drying temperature T1 = 120℃ × (26.25 / 7.5) = 420℃, argon flow rate Q = 0.5 m³ / h × t0, oxygen content is controlled at 0.09% during drying.

[0054] Screening process: After screening through a 0.83mm sieve, the sponge titanium particles passed through a 93% sieve. The mixed fine powder was separated through a 0.2mm sieve, and the water jet sand recovery rate was 92%. The impurity content of the titanium fine powder was 0.35%.

[0055] The data for this embodiment is shown in the table below:

[0056]

[0057] Example 3

[0058] Peeling process: Peeling was performed using a pneumatic pick, with a peeling thickness of h=7mm. After peeling, the surface roughness of the titanium ingot was Ra=3.1μm, which meets the surface quality requirements.

[0059] Gate cutting of bottom skin: The thickness of each cut by the gate cutting machine is d=20mm, the total thickness of bottom skin removed is H=60mm, the gate cutting pressure is P1=25MPa×(60mm / 45mm)≈33.3MPa, and the bottom skin material is collected after cutting for later use.

[0060] Waterjet cutting and crushing: Cutting gap D = 20mm × (1 + 0.1) = 22mm (k = 0.1), cutting distance L = 0.4mm × (22mm / 20mm) = 0.44mm, water flow velocity v = 250m / s. Nozzle size d0 = 0.4mm is selected, cutting pressure P2 = 350MPa, waterjet abrasive is 100-mesh garnet material, separated through a 0.83mm sieve after cutting, waterjet abrasive recycling rate η = 90%.

[0061] Acid leaching treatment: The amount of acid leaching material per batch is m=4 tons, the acid leaching solution is HCl solution with a concentration of C=15%, the acid leaching time is T=10h×(15% / 12%)=12.5h, the actual setting is 12h, the stirring speed is ω=60r / min×(4 / 3.5)≈68.6r / min, and the acid leaching solution is injected at a liquid-solid ratio of R=5:1.

[0062] Ultrasonic cleaning: The initial cleaning fluid conductivity σ0 = 180 μS / cm, the ultrasonic frequency f = 250 kHz × (180 / 20) = 2250 kHz, the cleaning was performed 4 times, the cleaning time for each time was t1 = 30 min, and the conductivity after the last cleaning was σ = 16 μS / cm, which meets the qualified standard.

[0063] Argon drying: drying time t=10min / t0, total drying time is 40min, drying temperature T1=120℃×(40 / 7.5)=640℃, argon flow rate Q=0.5m³ / h×t0, oxygen content is controlled at 0.1% during drying process.

[0064] Screening process: After screening through a 0.83mm sieve, the sponge titanium particles passed through a 94% sieve. The mixed fine powder was separated through a 0.2mm sieve, and the water jet sand recovery rate was 93%. The impurity content of the titanium fine powder was 0.3%.

[0065] The data for this embodiment is shown in the table below:

[0066]

[0067] The specific advantages of the method for crushing and removing impurities from the bottom layer of the sponge titanium weight in this invention are as follows:

[0068] 1. This invention employs waterjet cutting technology, combined with a cross-grid cutting method and precise parameter control. This not only successfully breaks large pieces of base material into uniform small particles, solving the problem of breaking hard base material, but also avoids the high wear and tear issues of traditional cutting equipment. Simultaneously, the cooling and buffering effect of the water jet during cutting effectively reduces cutting noise and dust generation, improving the production environment. Compared to the traditional method of directly selling the cut base material as scrap titanium, this significantly enhances the processing feasibility and subsequent utilization value of the base material.

[0069] 2. This invention significantly improves the grade and product quality of sponge titanium substrate through a multi-stage synergistic impurity removal design. The cutting stage utilizes the water-jet cutting method, leveraging the water solubility of chlorides, to achieve initial impurity removal. The acid leaching process employs a concentration-time-linked control algorithm to precisely remove metallic impurities such as Fe and Ni, while optimized stirring parameters ensure uniform and thorough impurity removal. Subsequent multi-stage ultrasonic cleaning, combined with conductivity testing standards, completely removes residual impurities from the acid leaching process, preventing the impact of Cl ions and other contaminants on product quality. This multi-step, progressive impurity removal design significantly reduces the impurity content in the substrate material, effectively solving the problem of low product grade caused by difficult impurity removal in traditional processes, and enabling substrate material that was originally waste titanium to meet the standards for qualified sponge titanium.

[0070] 3. This invention possesses highly efficient resource recycling capabilities, significantly reducing production consumption and costs. The garnet waterjet abrasive used in waterjet cutting achieves efficient recycling through two-stage screening, with a recycling rate exceeding 85%, reducing one-time investment in consumables. The acid leaching and cleaning processes, through batch optimization and precise parameter control, avoid acid waste and energy consumption caused by over-cleaning. Even the titanium fine powder separated by screening ensures its basic utilization value through strict impurity control, maximizing material utilization. Resource recycling design and energy consumption optimization effectively reduce the production cost per unit product, improving the overall economic efficiency and environmental friendliness of the production process.

[0071] 4. The process design of this invention possesses high stability and operability, adapting to the needs of industrialized mass production. Process parameters at each stage are quantitatively controlled through clearly defined formulas and algorithms. Key parameters such as gate cutting pressure, ultrasonic frequency, and drying temperature are linked to core indicators, ensuring consistency and stability across different batches. Control standards for each step are clear and quantifiable; for example, indicators such as surface roughness, conductivity, and oxygen content have explicit testing standards, facilitating quality control and process optimization during production. Furthermore, the equipment and operating procedures employed in this process conform to industrial production scenarios, enabling practical application without the need for specially customized equipment. This balances technological advancement with practical production use, providing a replicable and scalable solution for the efficient processing of sponge titanium substrates.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for crushing and removing impurities from the bottom layer of a sponge titanium weight, characterized in that, Includes the following steps: S1. Peel the produced sponge titanium ingot, removing the high-iron alloy brightening material from the sides and top. S2. Use a gate cutter to remove part of the titanium base skin to obtain a large piece of base skin material; S3. The large piece of bottom material is broken into small-particle sponge titanium by using a water jet cutting device with a cross grid cutting method. The cutting gap is set as D, which satisfies the formula D=20mm×(1±k), where k is the cutting accuracy correction coefficient, and the value range is 0-0.

1. S4. The crushed sponge titanium base particles are put into an acid leaching device for acid leaching treatment. The acid leaching time T satisfies the algorithm T=10h×(C / C0), where C is the actual concentration of the acid leaching solution and C0 is the standard concentration of the acid leaching solution of 12%. S5. After acid leaching, perform multi-stage ultrasonic cleaning on the sponge titanium substrate particles until the conductivity of the aqueous solution σ after cleaning is ≤20.0μS / cm. S6. The cleaned and qualified sponge titanium is dried under the protection of argon atmosphere. The drying time t satisfies t=(5-10)min / t0, where t0 is the unit mass of sponge titanium, and the value is 1t. S7. The dried sponge titanium is sieved to separate sponge titanium particles and mixed fine powder; S8. The mixed fine powder is screened again to separate the water jet sand and titanium fine powder according to the particle size difference. The separated water jet sand is returned to the water jet cutting process for recycling, while the titanium fine powder is collected and processed separately.

2. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S1, the peeling process is carried out using a pneumatic pick or a hydraulic peeling device, the peeling thickness h satisfies h≥5mm, and the surface roughness Ra of the peeled titanium weight is ≤3.2μm.

3. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S2, the thickness d of each cut by the gate cutter satisfies 10mm≤d≤20mm, and the total thickness H of the bottom skin removed satisfies 30mm≤H≤60mm. During the cutting process, the gate cutting pressure P1=25MPa×(H / 45mm), where H is the actual thickness of the bottom skin removed.

4. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S3, the nozzle size d0 of the waterjet cutting device satisfies 0.2mm≤d0≤0.4mm, the cutting pressure P2 satisfies 300MPa≤P2≤350MPa, the waterjet abrasive is made of garnet with a particle size of 80-100 mesh, and the waterjet abrasive recycling rate η≥85%, where η=(recycled waterjet abrasive mass / initial input waterjet abrasive mass)×100%.

5. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S3, the cutting distance L of the cross grid cutting is 0.4mm×(D / 20mm), where D is the actual value of the cutting gap, and the water flow velocity v during the cutting process is ≥200m / s.

6. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S4, the leaching solution is an HCl solution with a concentration of 10%-15%, the amount of leaching material m in each batch satisfies 3t≤m≤4t, the liquid-solid ratio of leaching solution to material R=5:1(mL / g), and the stirring speed during leaching is ω=60r / min×(m / 3.5).

7. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, The ultrasonic cleaning is performed 3-4 times, with each cleaning time t1 satisfying 20min≤t1≤30min. The ultrasonic frequency f=250kHz×(σ0 / σ), where σ0 is the initial conductivity of the cleaning fluid and σ is the target conductivity of 20.0μS / cm.

8. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S6, the temperature of the drying equipment is T1 = 120℃ × (t / 7.5min), where t is the actual drying time, the argon gas flow rate is Q = 0.5m³ / h × t0, t0 is the unit mass of sponge titanium, which is taken as 1 ton, and the oxygen content is controlled at ≤0.1% during the drying process.

9. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S7, the screening uses a 0.83mm screen, and the screening pass rate of sponge titanium particles is θ≥90%, where θ=(mass of particles on the screen / mass of total material after drying)×100%.

10. The method for crushing and removing impurities from the bottom layer of the sponge titanium weight according to claim 1, characterized in that, In step S8, the mixed fine powder separation uses a 0.2mm sieve, the water jet sand separation recovery rate φ≥90%, φ=(mass of water jet sand after separation / total mass of water jet sand in mixed fine powder)×100%, and the impurity content in the separated titanium fine powder is ≤0.5%.

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