Preparation method of high-purity iridium dioxide

An iridium dioxide, high-purity technology, applied in chemical instruments and methods, ruthenium/rhodium/palladium/osmium/iridium/platinum oxide/hydroxide, inorganic chemistry, etc., can solve the problem of low purity of iridium dioxide, difficult Purification and other issues to achieve the effect of eliminating complex processes, reducing economic costs, and reducing energy consumption

Active Publication Date: 2017-10-03
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, most of the iridium dioxide sold in the domestic and foreign markets has iridium elemental impurities, and the purity of iridium dioxide is low and difficult to purify.

Method used

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  • Preparation method of high-purity iridium dioxide
  • Preparation method of high-purity iridium dioxide
  • Preparation method of high-purity iridium dioxide

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment is used to illustrate the preparation method of high-purity iridium dioxide. Specifically, the method includes the following steps:

[0032] (1) take iridium elemental powder and copper oxide powder by the mass ratio of Ir:CuO=1:0.1;

[0033] (2) Put the iridium elemental powder and copper oxide powder prepared in the step (1) into a mortar, grind and mix evenly to obtain a mixed powder, and its particle diameter D90 is ~ 10 microns;

[0034] (3) Put the mixed powder obtained in step (2) into a crucible, put the crucible in a box furnace, and calcine at 800° C. for 1 hour under normal pressure and air atmosphere to obtain a calcined powder;

[0035] (4) Put the calcined powder obtained in step (3) into a beaker, add an appropriate amount of dilute nitric acid, wash away the residual copper oxide powder, and obtain IrO 2 precipitation;

[0036] (5) with step (4) gained IrO 2 The precipitate was washed three times with deionized water and dried to obta...

Embodiment 2

[0040] This embodiment is used to illustrate the preparation method of high-purity iridium dioxide. Specifically, the method includes the following steps:

[0041] (1) take iridium elemental powder and copper oxide powder by the mass ratio of Ir:CuO=1:0.5;

[0042] (2) Put the iridium elemental powder and copper oxide powder prepared in the step (1) into a mortar, grind and mix evenly to obtain a mixed powder, and its particle diameter D90 is ~ 5 microns;

[0043] (3) Put the mixed powder obtained in step (2) into a crucible, put the crucible in a box furnace, and calcine at 900° C. for 5 hours under normal pressure and air atmosphere to obtain a calcined powder;

[0044](4) Put the calcined powder obtained in step (3) into a beaker, add an appropriate amount of dilute nitric acid, wash away the residual copper oxide powder, and obtain IrO 2 precipitation;

[0045] (5) with step (4) gained IrO 2 The precipitate was washed three times with deionized water and dried to obtai...

Embodiment 3

[0049] This embodiment is used to illustrate the preparation method of high-purity iridium dioxide. Specifically, the method includes the following steps:

[0050] (1) take iridium elemental powder and copper oxide powder by the mass ratio of Ir:CuO=1:1;

[0051] (2) Put the iridium elemental powder and copper oxide powder prepared in the step (1) into a mortar, grind and mix evenly to obtain a mixed powder, and its particle diameter D90 is ~ 2 microns;

[0052] (3) Put the mixed powder obtained in step (2) into a crucible, put the crucible in a box furnace, and calcinate at 1000° C. for 15 hours under normal pressure and air atmosphere to obtain a calcined powder;

[0053] (4) Put the calcined powder obtained in step (3) into a beaker, add an appropriate amount of dilute nitric acid, wash away the residual copper oxide powder, and obtain IrO 2 precipitation;

[0054] (5) with step (4) gained IrO 2 The precipitate was washed three times with deionized water and dried to ob...

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Abstract

The invention discloses a preparation method of high-purity iridium dioxide. The method comprises the following steps: (1) mixing elemental iridium powder with copper oxide powder to obtain mixed powder; (2) calcining the mixed powder prepared in the step (1) at 800-1000 DEG C; (3) performing acid washing on the calcined powder in the step (2) to remove the copper oxide, thereby obtaining an IrO2 precipitate; and (4) washing the IrO2 precipitate prepared in the step (3), and performing drying to obtain the target product iridium dioxide. The method disclosed by the invention can eliminate the defects in the existing synthesis method that the IrO2 is difficult to acquire, the preparation process is complicated and complex, the cost is high and the IrO2 purity is low, and greatly lowers energy consumption during synthesis. Besides, the method is simple in process and favorable in repetitiveness; and used chemical reagents are low in price and accessible.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a preparation method of high-purity iridium dioxide. Background technique [0002] Iridium is a rare element discovered in 1803 as an insoluble impurity of platinum. Iridium is chemically extremely stable and is one of the most corrosion-resistant metals. In particular, iridium has extremely high chemical stability to acids, and is insoluble in common inorganic or organic acids at room temperature. Generally, only spongy iridium can slowly dissolve in hot aqua regia, and for dense iridium, even Even boiling aqua regia cannot corrode it. It is precisely because of this series of extremely stable characteristics of iridium that it is extremely difficult to obtain iridium dioxide by conventional preparation methods. [0003] Iridium dioxide has many potential uses. Iridium dioxide can be used to prepare anode coating materials. The electrode prepared by doping has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
CPCC01G55/004C01P2002/72C01P2006/80
Inventor 程金光蔡云麒崔琦
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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