Zone melting device for high-purity indium

Abstract

The utility model relates to the technical field of high-purity indium preparation, and provides a high-purity indium zone melting device which comprises a quartz tube (1), two supporting seats (2) are arranged in the quartz tube (1) at intervals, water-cooling copper molds (3) are arranged on the supporting seats (2), and graphite boats (4) are arranged on the two water-cooling copper molds (3); a heating coil (5) is arranged outside the quartz tube (1) and is used for heating an interval area between the two water-cooling copper molds (3); traction assemblies (6) for pulling the graphite boat (4) to move are arranged at the two ends of the quartz tube (1). The graphite boat is directly cooled through the water-cooling copper molds, the melting zone of indium during zone melting is conveniently controlled, the width of the melting zone is reduced by adjusting the distance between the two water-cooling copper molds, the impurity content of finished indium is gradually reduced, and the zone melting purification effect is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-purity indium preparation, and more particularly to a zone melting device for high-purity indium. BACKGROUND

[0002] Indium is a rare metal, which mainly occurs with zinc, copper, tin and the like having similar properties. Indium products are mainly recovered by processing residues, dust, slag and the like in a metallurgical process. With the development of science and technology and production, indium is widely used in the fields of semiconductor, electronic device, transparent conductive coating (ITO film), fluorescent material, metal organic compound and the like. The indium used in these fields is required to be high-purity, for example, the purity of indium in electronic devices and metal organic compounds is required to reach 99.999% or even 99.9999%. Therefore, the development and research of high-purity indium is an urgent problem to be solved. There are various methods for purifying indium, and the current production methods of high-purity indium mainly include electrolysis, vacuum distillation, zone melting, metal organic compound and low halide compound.

[0003] Among them, the zone melting method is to remove impurities by local heating of a long ingot, and the impurities are segregated to the solid phase or liquid phase in the repeated melting and solidification process, so as to obtain high-purity metal. With the decrease of the width of the melting zone, the impurity content of the finished indium gradually decreases, which indicates that reducing the width of the melting zone can improve the effect of zone melting purification. However, due to the low melting point of indium, which is only 156.61℃, with the narrowing of the melting zone, the control difficulty is higher and higher, which is easy to cause the solidification of the melting zone and affect the purification effect. CONTENT OF THE INVENTION

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the embodiments of the present application is to provide a zone melting device for high-purity indium, which controls the size of the melting zone by two water-cooled copper molds with adjustable spacing, and at the same time, the two water-cooled copper molds are used for timely cooling to lead out heat, so as to control the temperature of the melting zone.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide a zone melting device for high-purity indium, comprising: a quartz tube, two support seats are arranged in the quartz tube at intervals, a water-cooled copper mold is arranged on each support seat, and a graphite boat is arranged on the two water-cooled copper molds; a heating coil is arranged outside the quartz tube, and the heating coil is used for heating the interval region between the two water-cooled copper molds; traction assemblies for moving the graphite boat are arranged at both ends of the quartz tube.

[0006] In one embodiment, the spacing between the two support seats is adjustable.

[0007] In one embodiment, a screw rod is arranged between the two support seats, a nut is arranged on the outer side of the screw rod between the two support seats, and a spring is arranged on the inner side of the screw rod between the two support seats.

[0008] In one embodiment, one of the support seats is provided with a screw rod near one side of the other support seat, and the other support seat is provided with a through hole for the screw rod to pass through, and nuts are screwed on the screw rods on both sides of the other support seat.

[0009] In one embodiment, the traction assembly comprises a traction motor, a winding drum and a traction rope, the winding drum is arranged on the output shaft of the traction motor, and one end of the traction rope is fixed on the winding drum and the other end is fixed on one end of the graphite boat.

[0010] In one embodiment, a plurality of balance seats for supporting the graphite boat are arranged at intervals in the quartz tube.

[0011] The zone melting device for high-purity indium provided by the present application has the beneficial effects that the graphite boat is directly cooled by the water-cooled copper mold, the melting zone of indium during zone melting is conveniently controlled, the distance between the two water-cooled copper molds is adjusted to reduce the width of the melting zone, the impurity content of the finished indium gradually decreases, and the effect of zone melting purification is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0013] Fig. 1 The axial sectional view structure schematic diagram of the zone melting device for high-purity indium provided by the present application is shown in the figure.

[0014] Fig. 2 The radial sectional view structure schematic diagram of the zone melting device for high-purity indium provided by the present application is shown in the figure.

[0015] In the figure, various reference signs are as follows:

[0016] 1, quartz tube; 2, support seat; 3, water-cooled copper mold; 4, graphite boat; 5, heating coil; 6, traction assembly; 61, traction motor; 62, winding drum; 63, traction rope; 7, screw rod; 8, nut; 9, spring; 10, balance seat; 11, melting zone; 12, metallic indium. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] like Figs. 1-2 As shown, a zone melting apparatus for high-purity indium provided in this application embodiment will now be described. This high-purity indium zone melting apparatus includes: a quartz tube 1, a support base 2, a water-cooled copper mold 3, a graphite boat 4, a heating coil 5, and a traction assembly 6. The quartz tube 1 is made of high-purity quartz material and is used as a heating furnace tube. Two support seats 2 are spaced apart inside the quartz tube 1, and each support seat 2 is equipped with a water-cooled copper mold 3. The support seats 2 are made of metal materials such as copper. Graphite boats 4 are provided on the two water-cooled copper molds 3. Specifically, the water-cooled copper molds 3 are provided with semi-circular grooves. The graphite boats 4 have a semi-circular radial cross-section and are open at both ends. Metal indium 12 is placed inside the graphite boats 4. Heating coils 5 are provided outside the quartz tube 1. The heating coils 5 are used to heat the interval area between the two water-cooled copper molds 3. This heating area is the melting zone 11. Both ends of the quartz tube 1 are provided with traction components 6 to move the graphite boats 4, gradually melting the metal indium 12 at different positions inside the graphite tube.

[0022] In this embodiment, the distance between the two support bases 2 is adjustable, thereby realizing the adjustable distance between the two water-cooled copper molds 3. The two water-cooled copper molds 3 are connected to an external cold water source through inlet and outlet water pipes.

[0023] In one embodiment, a screw rod 7 is arranged between the two support seats 2, and nuts 8 are arranged on the outer sides of the screw rod 7 relative to the two support seats 2, and springs 9 are arranged on the inner sides of the screw rod 7 relative to the two support seats 2; the distance between the two support seats 2 can be adjusted by the springs 9 and the two nuts 8. In another embodiment, one of the support seats 2 is arranged with a screw rod 7 on one side close to the other support seat 2, the other support seat 2 is arranged with a through hole for the screw rod 7 to pass through, and nuts 8 are arranged on the screw rod 7 on both sides of the other support seat 2; the distance between the two support seats 2 can also be adjusted by adjusting the positions of the two nuts 8 on the screw rod 7.

[0024] In the embodiment, the traction assembly 6 comprises a traction motor 61, a winding drum 62 and a traction rope 63; the winding drum 62 is arranged on the output shaft of the traction motor 61, one end of the traction rope 63 is fixed on the winding drum 62, and the other end is fixed on one end of the graphite boat 4. The traction motor 61 is operated to drive the winding drum 62 to rotate, so that the traction rope 63 is wound on the winding drum 62, and the traction rope 63 pulls the graphite boat to move on the water-cooled copper mold 3, so that the heating coil 5 performs zone melting on different positions of the graphite boat 4.

[0025] In order to ensure the stability of the quartz tube 1 on the graphite shaft, a plurality of balance seats 10 for supporting the graphite boat 4 are arranged in the quartz tube 1 at intervals; the balance seats 10 are arranged to ensure the balance of the graphite shaft during movement.

[0026] During zone melting, the metal indium 12 is placed in the graphite boat 4, then the graphite boat 4 is placed on the two water-cooled copper molds 3, the water-cooled copper molds 3 are connected to cooling water, and argon gas is introduced into the quartz tube 1. The heating coil 5 is operated to heat the quartz tube 1, so as to heat and melt the metal indium 12 in the graphite boat 4; after the metal indium 12 is melted, the graphite boat 4 is moved by the traction assembly 6 to complete the zone melting.

[0027] The zone melting device for high-purity indium provided by the embodiment has the advantages of reasonable structure design, easy production and convenient use, and directly cools the graphite boat 4 by using the water-cooled copper mold 3, which is convenient to control the melting zone 11 of indium during zone melting, reduces the width of the melting zone 11, gradually reduces the impurity content of the finished indium, and improves the effect of zone melting purification. The graphite boat 4 is in direct contact with the water-cooled copper mold 3, and the heat near the melting zone 11 is conducted away by direct heat conduction.

[0028] The above merely provides the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A zone melting apparatus for high purity indium, characterized by comprising: The utility model relates to a graphite boat conveying device for quartz tube, which comprises: A quartz tube (1) is internally provided with two support seats (2) at intervals, each of the support seats (2) is provided with a water-cooled copper mold (3), and two water-cooled copper molds (3) are provided with graphite boats (4); the quartz tube (1) is externally provided with a heating coil (5) for heating the interval region between the two water-cooled copper molds (3); both ends of the quartz tube (1) are provided with traction assemblies (6) for pulling the graphite boats (4) to move.

2. The high purity indium zone melting apparatus of claim 1, wherein: The interval between the two support seats (2) is adjustable.

3. The high purity indium zone melting apparatus of claim 2, wherein: A screw rod (7) is arranged between the two support seats (2), a nut (8) is arranged on the outer side of the screw rod (7) between the two support seats (2), and a spring (9) is arranged on the inner side of the screw rod (7) between the two support seats (2).

4. The high purity indium zone melting apparatus of claim 2, wherein: One of the support seats (2) is provided with a screw rod (7) near one side of the other support seat (2), the other support seat (2) is provided with a through hole for the screw rod (7) to pass through, and nuts (8) are arranged on the screw rods (7) on both sides of the other support seat (2).

5. The zone melting apparatus for high purity indium as claimed in claim 3 or 4, wherein: The traction assembly (6) comprises a traction motor (61), a winding drum (62) and a traction rope (63), the winding drum (62) is arranged on the output shaft of the traction motor (61), one end of the traction rope (63) is fixed on the winding drum (62), and the other end is fixed on one end of the graphite boat (4).

6. The floating zone apparatus for high purity indium as claimed in claim 5, wherein: The quartz tube (1) is internally provided with a plurality of balance seats (10) for supporting the graphite boats (4).

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