KR102431948B1 - Manufacturing process technology of high quality-titanium cobble using titanium scrap - Google Patents

Abstract

The present invention relates to a titanium scrap cobble manufacturing process capable of manufacturing a high-quality titanium alloy using a titanium cobble instead of a titanium sponge used for manufacturing a titanium alloy. It's about manufacturing titanium cobbles to meet your business needs.

Description

Manufacturing process technology of high quality-titanium cobble using titanium scrap

The present invention relates to a manufacturing process of a titanium cobble using titanium scrap, and more particularly, to an efficient manufacturing of a titanium cobble that meets high quality and required size.

Commercialized titanium smelting was divided into the Kroll method of obtaining titanium tetrachloride (TiCl4) by chlorination reaction of titanium dioxide (TiO2) ore and then reducing it with magnesium to obtain sponge titanium, and the Hunter method of obtaining sponge titanium by reducing it with Na. Since then, only the Kroll method has been in commercial operation. Titanium has become an essential material as a material for aerospace, space, electric power, chemical plant, marine, civil engineering, medical care, welfare, and various consumer products, and as a functional material including shape memory alloy. The reason lies in the excellent properties of titanium, which is light, strong and rust-resistant. However, the problem with titanium is that it is expensive compared to general-purpose metals such as iron or aluminum. The reason is that iron or aluminum is smelted continuously and mass production is easy, whereas titanium smelting is a batch type by two-step chemical reaction and it is difficult to process at room temperature due to the crystal structure. In the processing process, it is difficult to control the productivity and the ratio of raw materials during processing. This is a cause that further hinders the general use of titanium. Therefore, there is a demand for the recycling of titanium. In the domestic titanium scrap market, the supply and demand for export at low prices and imports at high prices are unstable, and the technical industry base for the recycling of titanium scrap is also weak.

Therefore, in the present invention, by manufacturing a titanium cobble by applying a new manufacturing process that can produce a more high-quality scrap cobble by producing a recycled titanium scrap cob that can be applied instead of the sponge titanium used in the production of an existing titanium alloy. It is intended to be efficiently applied to alloy manufacturing.

Domestic titanium raw materials depend entirely on imports, and there is no technology for extracting metallic titanium from titanium ore, so an alternative to sponge titanium is needed. Therefore, the application technology of titanium scrap currently occurring in Korea is required.

Therefore, in the present invention, by developing a high-quality titanium cobble production process in order to produce a titanium alloy having a quality equal to or higher than that of sponge titanium, it is intended to provide a titanium cobble that meets the needs of a demanding company and a decrease in the raw material price by recycling titanium scrap.

Therefore, the present invention applied a rotary kiln process and a specially manufactured ring mill crusher for removing the contamination source on the surface of titanium scrap in order to manufacture a high-quality titanium cobble.

The manufacturing process for producing a high-quality titanium cobble is performed as follows.

A crushing step of crushing the titanium scrap; washing the scrap crushed in the crushing step by a rotary kiln process; a grinding step of manufacturing the scrap washed in the washing step into a cobbled shape through a ring mill grinder; It is a high-quality titanium cobble manufacturing process comprising a screening step of screening the titanium cobbles formed in the crushing step.

The titanium scrap used in the manufacturing process may be a sheet-type scrap or a pipe-type scrap used in a heat exchanger, but preferably a pipe-type scrap.

The crushing step is a step of manufacturing the titanium scrap to a processing size.

In the present invention, it is characterized in that it includes a cleaning process of removing impurities present on the surface of the scrap through a rotary kilton process after crushing in order to manufacture a high-quality cobble.

In the pulverization step, the scrap is pulverized through a specially manufactured ring mill pulverizer instead of the general pulverizer, and the pulverized scrap is produced in the form of cobbles. In addition, the ring mill grinder is characterized by integrally manufacturing a screen that can select the size of the cobbles.

The subsequent screening step is a step of precisely screening the size of the titanium cobble produced using a circular rotary type separator. The sorting step also includes installing a magnet to remove other metals in the titanium scrap.

The present invention also provides a high-quality titanium cobble produced by the manufacturing method of the present invention.

Titanium applied in the present invention is not only eco-friendly as well as economical compared to sponge titanium as using scrap.

In particular, the titanium cobble manufacturing technology using this scrap is still in its infancy, and it suggests the possibility of exporting high-quality titanium scrap.

By applying the manufactured titanium cobble, it is possible to facilitate the manufacture of titanium alloys used in many fields such as aviation materials, chemical devices, military applications, medical care, and automobiles.

In addition, through the process technology developed in the present invention, it is expected to reduce the dependence on imports of titanium sponge and at the same time strengthen the international competitiveness of the steel industry, which is a country-based industry.

1 is a schematic diagram of a titanium scrap cobble manufacturing process developed in the present invention.
Figure 2 is a cutter blade shape of the ring mill grinder specially manufactured in the present invention.
3 is a diagram of (a) a stepped screen and (b) a flat screen.
4 is (a) a titanium cobble produced by a general-purpose pulverizer and (b) a shape of a titanium cobble produced by a ring mill pulverizer.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that the features, components, etc. described in the specification are present, and one or more other features or components may not be present or may be added. Doesn't mean there isn't.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, with reference to the accompanying drawings, a person skilled in the art to which the present invention pertains will be described in detail so that it can be easily implemented.

The present invention relates to a process for producing a high-quality titanium cobble by using titanium scrap generated after machining instead of a titanium sponge, which enables the production of a titanium alloy having a quality equal to or higher than that of a titanium alloy produced with a titanium sponge. 1 is a schematic diagram of a titanium scrap cobble manufacturing process developed in the present invention.

Specifically, the manufacturing method of the present invention may include the following steps.

(S-1) crushing step of crushing the titanium scrap;

(S-2) washing the scrap crushed in the crushing step by a rotary kiln process;

(S-3) a grinding step of manufacturing the scrap washed in the washing step into a cobbled shape through a ring mill grinder;

(S-4) It is a titanium cobble manufacturing process using titanium scrap, including a screening step of sorting the titanium cobble formed in the crushing step.

In the step (S-1), the titanium scrap used may be a sheet-type scrap or a pipe-type scrap used in a heat exchanger, but preferably a pipe-type scrap.

The step (S-1) is a step of crushing the scrap to a processing size that meets the requirements of the titanium scrap.

In the step (S-2), since impurities such as cutting oil are adhered to the surface of the scrap, a rotary kiln process in which a combustion reaction is performed is performed to remove them. This has the effect of improving the quality of the cast titanium alloy by producing a high-quality scrap cobble.

In the step (S-2), process variables such as combustion temperature and time vary according to the shape and size of the titanium scrap, so the scope of the present invention is not limited.

In the step (S-3), the washed titanium scrap is crushed and the cobbled shape of the scrap is simultaneously performed using a ring mill grinder.

A pulverizer is a facility that produces powder or pulverizes powder into smaller pieces by crushing the solid with the force applied by colliding with a high-speed rotating HAMMER. However, the general-purpose grinder causes a fire and lowering of production due to overload and temperature rise in the facility due to the energy of high-speed rotation. Therefore, in the present invention, it is possible to secure stable production capacity by specially manufacturing a ring mill grinder capable of controlling the overload and temperature rise in the facility and at the same time processing the surface of the product.

In the step (S-3), the specially manufactured ring mill grinder is characterized in that it constructs a sawtooth-shaped cutter in a circular shape along the rotational axis, as shown in FIG. 2 . In addition, it is possible to install one or more such rotation shafts, characterized in that the rotation direction of each rotation shaft can be different. In addition, since the size of the manufactured cobble scrap is controlled by the width of the cutter blade, the present invention does not limit the scope of the width.

In the step (S-3), it includes designing a backflow prevention design inside the ring mill grinder to prevent backflow of scrap from the input hopper of the ring mill grinder.

The ring mill grinder in step (S-3) is a mechanical device for the purpose of crushing scrap, but the difference from general crushing equipment is that it can be produced in a cobble shape at the same time as crushing, and is formed with oxygen and other foreign substances on the surface of titanium scrap. There is an advantage that the shot blasting process can be omitted because the film can be removed.

The number of revolutions per minute (rpm), which is related to the efficiency of the ring mill grinder, depends on the type, size, and thickness of the scrap, so the scope is not limited in the present invention.

In addition, in step (S-3), a fire protection dust collector may be included in the ring mill grinder. Titanium has a specific gravity of about 4.2, and due to its high strength, it often bounces when pulverized, so the risk of dust explosion and fire is also very high due to shock ignition. can be significantly lowered.

The cobble scrap in the existing cobble manufacturing process is discharged and then moved through the take-out conveyor and sorted in a sorting unit including a screen. However, in the step (S-3), the efficiency of sizing cobbles can be further improved by arranging the screen integrally at the outlet of the ring mill grinder. The screen can be performed by manufacturing a stepped or flat screen, but it is efficient to use a flat screen. Since the size of the titanium cobble can be selected by changing the size of the screen hole, the range of the size of the hole is not limited. 3 shows a stepped screen and a flat screen.

In addition, in order to withstand the strength of the ring mill grinder in step (S-3), the screen in the ring mill grinder is characterized in that it is manufactured integrally with the support.

The step (S-4) is a step of precisely selecting the size of the produced titanium cobble using a circular rotary sorter. In addition, the titanium scrap generated after machining may contain other metals that are impurities due to the characteristics of the metal processing process. Accordingly, this sorting step may include installing a magnet to sort and remove other metals.

4 shows the shape of a titanium cobble manufactured by a general-purpose grinder and a titanium cobble manufactured by a ring mill grinder. The cobbles made with a general-purpose grinder are simply pressed in shape and have unequal shapes and have a low specific gravity, whereas the cobbles made with a ring mill grinder have the same shape and have high specific gravity. Therefore, the titanium cobble produced in the present invention is advantageous in manufacturing a titanium alloy because of its high purity and specific gravity by removing even the surface contamination source during production processing.

The size of the titanium cobble produced in the present invention is possible from 0.1mm to 100mm depending on the cutter blade width of the ring mill grinder, the number of grinders, and the direction of rotation, but the preferred size of the cobble for titanium alloy production is 1mm to 50mm. Below 1 mm and above 50 mm, it is difficult to uniformly disperse when manufacturing an alloy, and thus the quality of the alloy may be deteriorated.

In the present invention, since the titanium cobble is manufactured using scrap generated after metal processing, it is possible to overcome the difficulties of resource shortage and environmental problems caused by recycling.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims, and their equivalent concepts are interpreted as being included in the scope of the present invention. should be

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Claims (12)

(S-1) a crushing step of crushing the titanium scrap in the form of a pipe used in the heat exchanger;
(S-2) a washing step of removing impurities remaining in the scrap crushed in the crushing step using a rotary kiln process
(S-3) It has several rotating shafts so that the scrap washed in the washing step can be crushed and produced a cobble shape at the same time, each rotating shaft can be installed in a different direction of rotation, and a sawtooth cutter is built in a circular shape along the rotating shaft Titanium scrap produced in a cobbled shape by a ring mill grinder that removes the film formed of oxygen or foreign substances on the surface, thereby omitting the shot blasting process, and also adopts a backflow prevention design to prevent backflow of scrap inside the ring mill grinder Grinding step of producing a cobbled shape through a ring mill grinder comprising;
(S-4) In order to sort the titanium cobbles having a size of 0.1 mm to 100 mm formed in the grinding step, a stepped and flat screen that can be selected according to the size of the titanium cobbles at the outlet of the ring mill grinder is installed in the ring mill A titanium cobble manufacturing process using a titanium strap, characterized in that it includes a screening step of manufacturing and installing the product integrally in a grinder, and then selecting the titanium cobble using a rotary sorter in order to precisely sort the titanium cobble. delete delete delete delete delete The method of claim 1,
Titanium cobble manufacturing process using titanium scrap, characterized in that it comprises a fire protection dust collector inside the ring mill grinder. delete delete delete The method of claim 1,
Titanium cobble manufacturing process using titanium scrap, characterized in that it comprises a magnetic sorter inside the rotary sorter. delete

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