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Preparation method of ultra-pure tellurium

A technology of ultra-high and pure tellurium, which is applied in the field of preparation of ultra-high-purity tellurium, can solve the problems of high power consumption, low efficiency, and the inability of quartz boats to be sensed, and achieve the effect of bright surface and improved purification efficiency

Pending Publication Date: 2020-11-13
清远先导材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following defects: (1) the heating method adopted is induction heating, but tellurium belongs to non-metallic materials, and the efficiency of induction itself is relatively low, and the quartz boat cannot be induced at all. If the tellurium material in the quartz boat needs to be Melting requires a large heating power, which will cause excessive power consumption and increase production costs. At the same time, the higher the power of the induction heating equipment, the greater the surrounding magnetic field, which has certain harm to the physical and mental health of production workers; ( 2) This method cannot produce 7N ultra-high purity tellurium products

Method used

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  • Preparation method of ultra-pure tellurium

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Embodiment approach

[0030] This embodiment is an embodiment of the method for preparing ultra-high-purity tellurium of the present invention. The method for preparing ultra-high-purity tellurium in this embodiment includes the following steps:

[0031] (1) Soak the zone fused quartz boat with nitric acid and hydrofluoric acid mixed solution (nitric acid mass concentration 10% to 15%, hydrofluoric acid mass concentration 2 to 5%) for more than 8 hours to remove impurities on the surface. After soaking, use Clean it with pure water, and finally use the carbon coating furnace to perform coating operation on the surface of the fused quartz boat according to the carbon coating process;

[0032] (2) Clean the baffle quartz boat, zone fused quartz boat, zone fused graphite boat, zone furnace quartz tube, etc. with UP grade anhydrous ethanol and wipe clean with a dust-free cloth, and set aside;

[0033] (3) Put 5N raw material tellurium into the baffle quartz boat (such as figure 1 shown) in the right c...

Embodiment 2

[0043] This embodiment is an embodiment of the method for preparing ultra-high-purity tellurium of the present invention. The method for preparing ultra-high-purity tellurium in this embodiment includes the following steps:

[0044] (1) Soak the zone fused quartz boat with nitric acid and hydrofluoric acid mixed solution (nitric acid mass concentration 10% to 15%, hydrofluoric acid mass concentration 2 to 5%) for more than 8 hours to remove impurities on the surface. After soaking, use Clean it with pure water, and finally use the carbon coating furnace to perform coating operation on the surface of the fused quartz boat according to the carbon coating process;

[0045] (2) Clean the baffle quartz boat, zone fused quartz boat, zone fused graphite boat, zone furnace quartz tube, etc. with UP grade anhydrous ethanol and wipe clean with a dust-free cloth, and set aside;

[0046] (3) Put 5N raw material tellurium into the baffle quartz boat (such as figure 1 shown) in the right c...

Embodiment 3

[0056] This embodiment is an embodiment of the method for preparing ultra-high-purity tellurium of the present invention. The method for preparing ultra-high-purity tellurium in this embodiment includes the following steps:

[0057] (1) Soak the zone fused quartz boat with nitric acid and hydrofluoric acid mixed solution (nitric acid mass concentration 10% to 15%, hydrofluoric acid mass concentration 2 to 5%) for more than 8 hours to remove impurities on the surface. After soaking, use Clean it with pure water, and finally use the carbon coating furnace to perform coating operation on the surface of the fused quartz boat according to the carbon coating process;

[0058] (2) Clean the baffle quartz boat, zone fused quartz boat, zone fused graphite boat, zone furnace quartz tube, etc. with UP grade anhydrous ethanol and wipe clean with a dust-free cloth, and set aside;

[0059] (3) Put 5N raw material tellurium into the baffle quartz boat (such as figure 1 shown) in the right c...

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Abstract

The invention discloses a preparation method of ultrahigh-purity tellurium, and belongs to the field of high-purity metal materials. The method comprises the following steps: putting raw material tellurium into a container in which a baffle plate is arranged, positioning the raw material tellurium on one side of the baffle plate; heating the raw material tellurium under the protection of shieldinggas until tellurium is completely molten; and controlling the liquid level of the tellurium melt on the side where the raw material tellurium is located to be above the through hole of the baffle plate so that impurities (carbon powder and oxide) in the raw material tellurium are intercepted on one side of the baffle plate. The impurity content of the tellurium melt flowing to the other side through the through hole is reduced, the part of tellurium melt is condensed and then used for preparing the ultra-pure tellurium, the purification efficiency is improved, and the obtained ultra-pure tellurium is bright in surface, free of oxide and free of subsequent treatment.

Description

technical field [0001] The invention belongs to the field of high-purity metal materials and relates to a preparation method of ultra-high-purity tellurium. Background technique [0002] The purity of ultra-high-purity tellurium reaches 99.99999% (7N). The cadmium zinc telluride (CZT) nuclear radiation detector and the mercury cadmium telluride (MCT) infrared detector substrate material made of ultra-high-purity tellurium are used in national defense, security, positioning, and guidance. Infrared detection and other fields have a wide range of applications. Impurities in tellurium directly affect the performance of CZT and MCT crystal materials, and then affect the detection range and detection accuracy of these two detectors. Therefore, it is of great significance to study and prepare an ultra-high-purity tellurium product with ultra-high purity and stable quality and performance. . [0003] At present, the main preparation method of ultra-high-purity tellurium adopts the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02C30B13/00C30B28/08C30B29/02
CPCC01B19/02C30B13/00C30B28/08C30B29/02
Inventor 黄杰杰朱刘何志达李清宇
Owner 清远先导材料有限公司
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