Device and production method for high-oxygen-content sponge titanium product special for smelting titanium alloy

Abstract

The invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a device for smelting a high-oxygen-content sponge titanium product special for titanium alloy and a production method. The device comprises a titanium tetrachloride storage tank which is connected with a refined titanium tetrachloride source and is used for storing refined titanium tetrachloride; the transfer tank is communicated with the titanium tetrachloride storage tank through a first conveying pipeline provided with a first valve, and a stirring paddle is arranged in the transfer tank; the titanium dioxide bin is communicated with the transfer tank through a second conveying pipeline and is arranged to store titanium dioxide, and a second valve and a quantitative feeding device are arranged on the second conveying pipeline; and the reduction furnace is communicated with the transfer tank through a third conveying pipeline provided with a third valve, and a reduction reactor is arranged in the reduction furnace. According to the device, by controlling the oxygen content and dosage ratio of refined titanium tetrachloride and titanium dioxide, uniform component elements are ensured from the source, and the quality of a titanium material is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metallurgy, and more specifically, relates to a device and a production method for a high-oxygen-content titanium sponge product specially used for smelting titanium alloys. Background Art

[0002] Sponge titanium is the main material for producing titanium materials, and the oxygen content is an important indicator. At present, titanium materials are usually produced at home and abroad by adding titanium-containing residues. Residue addition refers to the use of titanium and titanium alloy residues instead of sponge titanium for smelting when a vacuum consumable arc furnace or a cooling hearth furnace is used to smelt titanium and titanium alloys. The main forms of titanium and titanium alloy residues are: cutting, block residues, long strip scraps, ingot caps, round cake residues, etc. Due to the small amount of residues and large fluctuations in element content between different batches, there are large fluctuations in impurity components and poor quality of titanium billets during the titanium smelting process.

[0003] Chinese patent CN 214496452 ​​U discloses a titanium sponge oxygen enrichment device, including a feeding mechanism, a cooling mechanism, a heating furnace arranged between the feeding mechanism and the cooling mechanism, and a conveyor mesh belt connecting the feeding mechanism and the cooling mechanism, the conveyor mesh belt is used to convey titanium sponge, and runs through the inlet and outlet of the heating furnace, the heating furnace is evenly distributed with a first electric heating radiation tube, the heating furnace is provided with an air inlet pipe matching the cross section of the heating furnace near the outlet end, the air inlet pipe is evenly distributed with gas nozzles, a premixer and a preheater are provided outside the heating furnace, the premixer is provided with an oxygen inlet pipe, a protective gas inlet pipe and an oxygen analyzer, the preheater is evenly distributed with a second electric heating radiation tube, the preheater is provided with a temperature sensor, and the premixer, the preheater and the air inlet pipe are connected in sequence through pipelines. This technical solution can make the preheated mixed gas form a stable airflow in the opposite direction of the titanium sponge conveying direction, improve the oxygen enrichment effect of titanium sponge, and avoid the phenomenon of large fluctuations in oxygen content in titanium ingots. This technical solution obtains titanium material with high oxygen content by adding oxygen during the smelting process of titanium sponge, which not only adds additional steps but also increases the manufacturing cost of titanium material.

[0004] Therefore, there is an urgent need for a production method of high-oxygen-content sponge titanium specially used for smelting titanium alloys with uniform component elements. Summary of the invention

[0005] In view of this, the present invention proposes a device and a production method for high-oxygen sponge titanium specially used for smelting titanium alloys. By controlling the oxygen content and dosage ratio of refined titanium tetrachloride and titanium dioxide, the uniformity of component elements is ensured from the source, thereby ensuring the quality of titanium materials.

[0006] In order to solve at least one of the above technical problems, the present invention adopts the following technical solution: According to one aspect of the present invention, there is provided a device for smelting a high-oxygen-content sponge titanium product dedicated to titanium alloy, comprising: a titanium tetrachloride storage tank, connected to a refined titanium tetrachloride source and configured to store refined titanium tetrachloride; a transfer tank, connected to the titanium tetrachloride storage tank via a first conveying pipeline provided with a first valve, the transfer tank being provided with a stirring paddle inside; a titanium dioxide silo, connected to the transfer tank via a second conveying pipeline and configured to store titanium dioxide, the second conveying pipeline being provided with a second valve and a quantitative feeding device; and a reduction furnace, connected to the transfer tank via a third conveying pipeline provided with a third valve, the reduction furnace being provided with a reduction reactor inside.

[0007] According to one embodiment of the present invention, the first conveying pipeline and the second conveying pipeline respectively introduce refined titanium tetrachloride and titanium dioxide from the top of the transfer tank. The stirring paddle comprises: a stirring shaft extending vertically; and a plurality of stirring blades extending horizontally from the middle of the stirring shaft and uniformly arranged around the stirring shaft.

[0008] According to one embodiment of the present invention, the quantitative feeding device includes: a weighing tank having a hollow tank structure and arranged on the second conveying pipeline; a nitrogen purge pipeline extending into the interior of the weighing tank at the top of the weighing tank; and a gravity weighing scale installed inside the weighing tank and configured to measure the weight change of titanium dioxide in the weighing tank in real time.

[0009] According to one embodiment of the present invention, the device also includes: a controller, which is communicatively connected to the first valve, the second valve, and the gravity weighing scale, and is configured to control the opening and closing of the second valve based on flow data from the first valve and weight data from the gravity weighing scale.

[0010] According to another aspect of the present invention, a method for producing a high-oxygen content sponge titanium product specially used for smelting titanium alloys is provided. The method adopts the device as described in any of the above embodiments and comprises the following steps: opening a first valve to introduce refined titanium tetrachloride into a transfer tank; opening a second valve to introduce titanium dioxide into the transfer tank, and controlling the weight ratio of titanium dioxide to refined titanium tetrachloride in the transfer tank to be 30-50 kg / t; stirring the titanium dioxide and refined titanium tetrachloride evenly in the transfer tank to obtain a mixed material; and opening a third valve to introduce the mixed material into a reduction reactor of a reduction furnace for a reduction reaction to obtain a high-oxygen content sponge titanium product.

[0011] According to one embodiment of the present invention, refined titanium tetrachloride includes titanium tetrachloride and at least one of the following components: COCl2, CO, CO2, CCl3COCl, CHCl2COCl, CH2ClCOCl and TiOCl2.

[0012] According to one embodiment of the present invention, the oxygen content of the refined titanium tetrachloride is 0.008%-0.012%.

[0013] According to one embodiment of the present invention, the particle size range of titanium dioxide is controlled to be 10-50 nm.

[0014] According to one embodiment of the present invention, titanium dioxide includes titanium dioxide and at least one of the following components: Al2O3, Fe2O3, and Cr2O3.

[0015] According to one embodiment of the present invention, the oxygen content of titanium dioxide is 0.35%-0.60%.

[0016] By adopting the above technical solution, the present invention has at least one of the following advantages compared with the prior art: 1. The device according to the present invention has a simple structure and a reasonable layout, and can achieve accurate addition of refined titanium tetrachloride and titanium dioxide according to the weight ratio; 2. According to the method of the present invention, high oxygen content sponge titanium products are produced by controlling the particle size and oxygen content of the raw materials. The oxygen content of the product is easy to control, the cost is low and the operation is convenient; 3. The high oxygen content titanium sponge product produced according to the method of the present invention has uniform composition elements, which is conducive to ensuring the quality of subsequent titanium materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a device for melting a high-oxygen content titanium sponge product dedicated to titanium alloy according to an embodiment of the present invention is shown; Figure 2 A top view of a stirring paddle according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a quantitative feeding device according to an embodiment of the present invention is shown; Figure 4 A flow chart of a method for producing a high-oxygen content titanium sponge product specifically for smelting titanium alloys according to an embodiment of the present invention is shown.

[0019] In the figure, 100-titanium tetrachloride storage tank, 110-refined titanium tetrachloride source; 200-first delivery pipeline, 210-first valve; 300 - transfer tank, 310 - stirring paddle, 311 - stirring shaft, 312 - first stirring blade, 313 - second stirring blade, 314 - third stirring blade, 315 - fourth stirring blade; 400-Titanium dioxide silo; 500 - second delivery pipeline, 510 - second valve, 520 - quantitative feeding device, 521 - weighing tank, 522 - nitrogen purge pipeline, 523 - gravity weighing scale; 600-reduction furnace, 610-reduction reactor; 700 - the third delivery pipeline, 710 - the third valve. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0021] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0022] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] According to one aspect of the present invention, there is provided a device for melting a high oxygen content titanium sponge product dedicated to titanium alloy, such as Figure 1As shown, it mainly includes a titanium tetrachloride storage tank 100, a transfer tank 300, a titanium dioxide silo 400 and a reduction furnace 600. Specifically, the titanium tetrachloride storage tank 100 is connected to a refined titanium tetrachloride source 110 and is configured to store refined titanium tetrachloride; the transfer tank 300 is connected to the titanium tetrachloride storage tank 100 through a first delivery pipeline 200 provided with a first valve 210; the titanium dioxide silo 400 is connected to the transfer tank 300 through a second delivery pipeline 500 and is configured to store titanium dioxide, and the second delivery pipeline 500 is provided with a second valve 510 and a quantitative feeding device 520; the reduction furnace 600 is connected to the transfer tank 300 through a third delivery pipeline 700 provided with a third valve 710. Among them, the transfer tank 300 is provided with a stirring paddle 310 inside to mix the refined titanium tetrachloride and titanium dioxide uniformly by stirring. A reduction reactor 610 is provided inside the reduction furnace 600. The fully mixed refined titanium tetrachloride and titanium dioxide are introduced into the reduction reactor 610 for a reduction reaction, and finally a high-oxygen content titanium sponge product is obtained.

[0024] In the embodiment of the present invention, the first delivery pipeline 200 and the second delivery pipeline 500 respectively introduce the refined titanium tetrachloride and titanium dioxide from the top of the transfer tank 300. Figure 2 As shown, the stirring paddle 310 may include a stirring shaft 311 extending vertically and a first stirring blade 312, a second stirring blade 313, a third stirring blade 314, and a fourth stirring blade 315 extending horizontally from the middle of the stirring shaft 311 and uniformly arranged around the stirring shaft 311. Figure 2 Four stirring blades are shown in the figure, and those skilled in the art can increase or decrease the number of stirring blades, or change the shape of the stirring blades according to actual working conditions.

[0025] like Figure 3As shown, the quantitative feeding device 520 may include a weighing tank 521, a nitrogen purge pipeline 522 and a gravity weighing scale 523. Specifically, the weighing tank 521 has a hollow tank structure and is arranged on the second conveying pipeline 500, for accommodating the titanium dioxide to be fed, and can be used as a container for temporarily storing titanium dioxide during the feeding process, so that the titanium dioxide can enter the transfer tank 300 in an orderly and quantitative manner. The nitrogen purge pipeline 522 extends into the weighing tank 521 at the top of the weighing tank 521, and it can pass nitrogen into the weighing tank 521 to blow the titanium dioxide in the weighing tank 521 and the subsequent channel into the transfer tank 300, so as to avoid the titanium dioxide remaining in the weighing tank 521 and affecting the accuracy of the raw material ratio. The gravity weighing scale 523 is installed inside the weighing tank 521 and is configured to measure the weight change of the titanium dioxide in the weighing tank 521 in real time. Therefore, the amount of material added can be accurately fed back through the gravity weighing scale 523, which is convenient for the operator to accurately control the feeding process and achieve the purpose of quantitative feeding. Furthermore, the gravity weighing scale 523 can also record the weighing data, which is convenient for subsequent tracing and statistical analysis of the feeding situation, and is also conducive to monitoring the entire quantitative feeding process to ensure the accuracy and stability of the feeding operation.

[0026] In a preferred embodiment of the present invention, the device for melting a high oxygen content sponge titanium product dedicated to titanium alloy may also include a controller to realize the automatic feeding and operation of the device. The controller can be connected to the first valve 210, the second valve 510, and the gravity weighing scale 523, and is configured to control the opening and closing of the second valve 510 based on the flow data from the first valve 210 and the weight data from the gravity weighing scale 523. Specifically, the first valve 210 can be a flow control valve, which records and accurately controls the flow of refined titanium tetrachloride, and sends the amount of titanium tetrachloride introduced into the transfer tank 300 to the controller. The controller opens the second valve 510, introduces titanium dioxide into the transfer tank 300, and the weight of the added titanium dioxide is measured in real time during the feeding process of the gravity weighing scale 523 and sent to the controller. The controller closes the second valve 210 in time based on the set weight ratio of titanium dioxide to refined titanium tetrachloride, thereby realizing the precise feeding of titanium dioxide.

[0027] According to another aspect of the present invention, a method for producing a high oxygen content titanium sponge product dedicated to melting titanium alloy is provided, such as Figure 4 As shown, the overall process includes the following steps: Open the first valve 210 to introduce refined titanium tetrachloride into the transfer tank 300; Open the second valve 510 to introduce titanium dioxide into the transfer tank 300, and control the weight ratio of titanium dioxide to refined titanium tetrachloride in the transfer tank 300 to be 30-50 kg / t; In the transfer tank 300, titanium dioxide and refined titanium tetrachloride are uniformly stirred to obtain a mixed material; and The third valve 710 is opened to introduce the mixed material into the reduction reactor 610 of the reduction furnace 600 for reduction reaction to obtain a high oxygen content titanium sponge product.

[0028] In an embodiment of the present invention, refined titanium tetrachloride includes titanium tetrachloride and at least one of the following components: COCl2, CO, CO2, CCl3COCl, CHCl2COCl, CH2ClCOCl and TiOCl2. The oxygen content of refined titanium tetrachloride is 0.008%-0.012%. The particle size range of titanium dioxide is controlled to be 10-50nm. Titanium dioxide includes titanium dioxide and at least one of the following components: Al2O3, Fe2O3, Cr2O3. The oxygen content of titanium dioxide is 0.35%-0.60%.

[0029] The following is a specific embodiment of the production method of a high oxygen content sponge titanium product specifically for smelting titanium alloys according to the present invention and its specific process parameters.

[0030] Example 1 The production method of the high oxygen content titanium sponge product dedicated to smelting titanium alloy in this embodiment includes the following steps: Open the first valve 210 to introduce refined titanium tetrachloride with an oxygen content of 0.008% into the transfer tank 300; Open the second valve 510 to introduce titanium dioxide with a particle size range of 10-50 nm and an oxygen content of 0.60% into the transfer tank 300, and control the weight ratio of titanium dioxide to refined titanium tetrachloride in the transfer tank 300 to be 30 kg / t; Stirring titanium dioxide and refined titanium tetrachloride in the transfer tank 300 for 5 minutes to obtain a mixed material; and The third valve 710 is opened to introduce the mixed material into the reduction reactor 610 of the reduction furnace 600 for reduction reaction to obtain a high oxygen content titanium sponge product.

[0031] In this embodiment, Mg is used as a reducing agent to carry out a reduction reaction with the mixed material, and the oxygen content of the high-oxygen-content sponge titanium product obtained after vacuum distillation is 0.25%.

[0032] Example 2 The production method of the high oxygen content titanium sponge product dedicated to smelting titanium alloy in this embodiment includes the following steps: Open the first valve 210 to introduce refined titanium tetrachloride with an oxygen content of 0.010% into the transfer tank 300; Open the second valve 510 to introduce titanium dioxide with a particle size range of 10-50 nm and an oxygen content of 0.40% into the transfer tank 300, and control the weight ratio of titanium dioxide to refined titanium tetrachloride in the transfer tank 300 to be 50 kg / t; Stirring titanium dioxide and refined titanium tetrachloride in the transfer tank 300 for 4 minutes to obtain a mixed material; and The third valve 710 is opened to introduce the mixed material into the reduction reactor 610 of the reduction furnace 600 for reduction reaction to obtain a high oxygen content titanium sponge product.

[0033] In this embodiment, Mg is used as a reducing agent to carry out a reduction reaction with the mixed material, and the oxygen content of the high-oxygen sponge titanium product obtained after vacuum distillation is 0.30%.

[0034] Example 3 The production method of the high oxygen content titanium sponge product dedicated to smelting titanium alloy in this embodiment includes the following steps: Open the first valve 210 to introduce refined titanium tetrachloride with an oxygen content of 0.012% into the transfer tank 300; Open the second valve 510 to introduce titanium dioxide with a particle size range of 10-50 nm and an oxygen content of 0.50% into the transfer tank 300, and control the weight ratio of titanium dioxide to refined titanium tetrachloride in the transfer tank 300 to be 40 kg / t; Stirring titanium dioxide and refined titanium tetrachloride in the transfer tank 300 for 3 minutes to obtain a mixed material; and The third valve 710 is opened to introduce the mixed material into the reduction reactor 610 of the reduction furnace 600 for reduction reaction to obtain a high oxygen content titanium sponge product.

[0035] In this embodiment, Mg is used as a reducing agent to carry out a reduction reaction with the mixed material, and the oxygen content of the high-oxygen-content sponge titanium product obtained after vacuum distillation is 0.25%.

[0036] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A device for melting high oxygen content titanium sponge products for titanium alloys, characterized in that: include: A titanium tetrachloride storage tank (100), connected to a refined titanium tetrachloride source (110) and configured to store refined titanium tetrachloride; A transfer tank (300) is connected to the titanium tetrachloride storage tank (100) via a first delivery pipeline (200) provided with a first valve (210), and a stirring paddle (310) is provided inside the transfer tank (300); a titanium dioxide silo (400), which is connected to the transfer tank (300) via a second delivery pipeline (500) and is configured to store titanium dioxide, wherein the second delivery pipeline (500) is provided with a second valve (510) and a quantitative feeding device (520); and The reduction furnace (600) is connected to the transfer tank (300) via a third delivery pipeline (700) provided with a third valve (710), and a reduction reactor (610) is provided inside the reduction furnace (600).

2. The device according to claim 1, characterized in that The first delivery pipeline (200) and the second delivery pipeline (500) respectively introduce refined titanium tetrachloride and titanium dioxide from the top of the transfer tank (300), and the stirring paddle (310) comprises: a vertically extending stirring shaft (311); and A plurality of stirring blades (312, 313, 314, 315) extend horizontally from the middle of the stirring shaft (311) and are evenly arranged around the stirring shaft (311).

3. The device according to claim 1, characterized in that The quantitative feeding device (520) comprises: A weighing tank (521) having a hollow tank structure and arranged on the second conveying pipeline (500); A nitrogen purge pipeline (522) extends into the weighing tank (521) at the top of the weighing tank (521); and A gravity weighing scale (523) is installed inside the weighing tank (521) and is configured to measure the weight change of the titanium dioxide in the weighing tank (521) in real time.

4. The device according to claim 3, characterized in that The device also includes: A controller is communicatively connected to the first valve (210), the second valve (510), and the gravity weighing scale (523), and is configured to control the opening and closing of the second valve (510) based on flow data from the first valve (210) and weight data from the gravity weighing scale (523).

5. A method for producing a high oxygen content titanium sponge product for melting titanium alloy, characterized in that: The production method uses the device according to any one of claims 1 to 4 and comprises the following steps: Opening the first valve (210) to introduce refined titanium tetrachloride into the transfer tank (300); Opening the second valve (510) to introduce titanium dioxide into the transfer tank (300), and controlling the weight ratio of titanium dioxide to refined titanium tetrachloride in the transfer tank (300) to be 30-50 kg / t; In the transfer tank (300), titanium dioxide and refined titanium tetrachloride are uniformly stirred for 2 to 5 minutes to obtain a mixed material; as well as The third valve (710) is opened to introduce the mixed material into the reduction reactor (610) of the reduction furnace (600) for a reduction reaction to obtain a high-oxygen content titanium sponge product.

6. The method according to claim 5, characterized in that Refined titanium tetrachloride includes titanium tetrachloride and at least one of the following components: COCl2, CO, CO2, CCl3COCl, CHCl2COCl, CH2ClCOCl and TiOCl2.

7. The method according to claim 6, characterized in that The oxygen content of refined titanium tetrachloride is 0.008%-0.012%.

8. The method according to claim 5, characterized in that The particle size range of titanium dioxide is controlled in 10~50nm.

9. The method according to claim 5, characterized in that Titanium dioxide includes TiO2 and at least one of the following components: Al2O3, Fe2O3, and Cr2O3.

10. The method according to claim 9, characterized in that The oxygen content of titanium dioxide is 0.35%-0.60%.

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