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Preparation method of indium oxide and precursor thereof

A technology of indium oxide and precursors, applied in the field of preparation of indium oxide and its precursors, to achieve the effects of ensuring stability, good environmental protection, and stable particle size

Active Publication Date: 2020-01-03
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above two methods of preparing indium oxide by electrolysis, the cathode is a nitrate reduction reaction, resulting in the generation of waste water and waste gas such as nitrogen oxides and nitrite.

Method used

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  • Preparation method of indium oxide and precursor thereof
  • Preparation method of indium oxide and precursor thereof
  • Preparation method of indium oxide and precursor thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] An embodiment of the preparation method of indium oxide of the present invention. The electrolysis device adopted in the preparation method is composed of 3 cathode chambers and 2 anode chambers. The cathode chambers and the anode chambers are arranged alternately with a proton membrane between them. The size of the anode chambers is 230*230*40mm (2.1L). The indoor and indoor dimensions are 230*230*20mm (1.05L), the volume of the anolyte storage tank is 60L, the volume of the catholyte storage tank is 30L, the anode chamber is connected with the anolyte storage tank, and the cathode chamber is connected with the cathode The electrolyte storage tank and the anolyte storage tank are connected; the anode indium plates are made of 4N elemental indium through an automatic casting system, and the effective electrolytic size of the anode plates is 200*80*15mm, which are installed alternately and parallelly in each anode chamber ; Cathode aluminum plates are alternately install...

Embodiment 2

[0063] An embodiment of the preparation method of indium oxide of the present invention. The electrolysis device, negative electrode and anode that this preparation method adopts are all identical with embodiment 1; The ammonium nitrate aqueous solution that the pH value is 5.0-5.5, concentration is 1.0mol / L adds catholyte storage tank, anode chamber and cathode chamber respectively, Then heat the anolyte and catholyte to 40°C, turn on the power, and set the current density to 800A / m 2 , put the anolyte between the anode chamber and the anolyte storage tank at a distance of 0.75m 3 / h speed circulation, ammonium nitrate aqueous solution is transported from the catholyte storage tank to the cathode chamber at a speed of 1.5L / h, and hydrogen peroxide is transported to the cathode chamber at a speed of 0.030mol / (A h), while the catholyte passes through the cathode chamber The overflow port of the anolyte enters the anolyte storage tank, and when the solid content of the anolyte ...

Embodiment 3

[0065] An embodiment of the preparation method of indium oxide of the present invention. The electrolysis device, cathode and anode that this preparation method adopts are all identical with embodiment 1; The ammonium nitrate aqueous solution that pH value is 4.0-4.5, concentration is 2.5mol / L adds catholyte storage tank, anode chamber and cathode chamber respectively, Then heat the anolyte and catholyte to 40°C, turn on the power, and set the current density to 1800A / m 2 , put the anolyte between the anode chamber and the anolyte storage tank at 1.7m 3 / h speed cycle, the ammonium nitrate aqueous solution is transported from the catholyte storage tank to the cathode chamber at a speed of 3.0L / h, and the hydrogen peroxide is transported to the cathode chamber at a speed of 0.038mol / (A h), while the catholyte passes through the cathode chamber The overflow port of the anolyte enters the anolyte storage tank, and when the solid content of the anolyte is about 5wt% after electro...

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Abstract

The invention provides a preparation method of indium oxide and a precursor thereof, belonging to the technical field of inorganic materials. According to the method, metal indium is used as a positive electrode, an inert electrode is used as a negative electrode, an aqueous ammonium salt solution is used as an electrolyte for electrolysis, and hydrogen peroxide is added during electrolysis to obtain indium hydroxide, so nitrate is prevented from being reduced to generate nitrite or nitric oxide, and the preparation process is environmentally friendlier; an anolyte circularly flows between a positive chamber and an anolyte storage tank, a catholyte flows through a negative chamber from a catholyte storage tank and then flows to the anolyte storage tank, and NH<4+> is diffused from the positive chamber to the negative chamber through a cation selective permeation membrane, so the stability of the anolyte and the catholyte is ensured, subsequent stable acquisition of nanometer indium oxide powder with uniform granularity is well guaranteed, and zero emission of waste gas and waste water is easy to achieve; meanwhile, the anolyte can still guarantee normal operation of a system underthe condition of a high solid content, so process efficiency is improved, productivity is increased, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and relates to a preparation method of indium oxide and its precursor. Background technique [0002] Indium oxide (In 2 o 3 ) is a new n-type transparent semiconductor functional material with wide bandgap width, small resistivity and high catalytic activity. The ITO (Indium tin oxide, indium tin oxide) target manufactured by it is used to manufacture the ITO film formed by sputtering technology, which has outstanding optical and electrical properties and is widely used in the flat panel display (FPD) industry, including liquid crystal displays ( LCD), touch screen (Touch Panel), plasma tube display (PDP) and other products, as well as industries such as solar cells and functional glass. [0003] Indium oxide is generally prepared by chemical precipitation. The chemical precipitation method usually dissolves indium into indium salt solution, mixes it with lye under certain conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00B82Y30/00B82Y40/00C01G15/00
CPCC25B1/00B82Y30/00B82Y40/00C01G15/00C01P2002/72C01P2004/01C01P2004/64C01P2006/12
Inventor 黄娟王继民刘纪杰朱刘
Owner 昆明先导新材料科技有限责任公司
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