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Method for removing copper and other impurities in preparing tantalum niobium oxide

An oxide, tantalum and niobium technology, applied in the field of rare metal chemical material extraction, can solve the problems of difficult reduction of impurity F content, failure to meet development requirements, difficulty in copper removal, etc., achieve less reagent consumption and save copper removal reaction time , the effect of short reaction time

Active Publication Date: 2020-11-24
江西拓泓新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, it is the same as the products prepared by existing conventional methods, not only the cost is high, but copper removal is difficult; and the content of impurity F is also difficult to reduce. Usually, it needs to be roasted at a temperature above 1000 ° C for more than 8 hours. , so that the fluorine can be better removed. Therefore, the tantalum and niobium oxide products prepared after copper removal cannot meet the development requirements of the current technology market.

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  • Method for removing copper and other impurities in preparing tantalum niobium oxide
  • Method for removing copper and other impurities in preparing tantalum niobium oxide

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Embodiment 1

[0037] This embodiment discloses a method for removing copper and other impurities in the preparation of tantalum-niobium oxide, which uses the fluoroniobic acid or fluorotantalic acid solution obtained after extraction and separation as a raw material to perform copper removal treatment, including the following steps:

[0038] (1) One-time copper removal treatment, the content of niobium pentoxide in 4000L fluoroniobic acid solution is 130-180g / l, add copper removal agent ammonium sulfide solution 1.8kg to it, and under the condition of constant stirring, stir 2 minutes, perform a copper removal treatment; control the copper content in the fluoroniobic acid or fluorotantalic acid solution to 0.25-0.32g / l; and control the copper removal treatment under acidic conditions; can be added by adding ammonium sulfate solution To adjust the acidity of the solution during the copper removal process, so that copper can be precipitated as much as possible while maintaining its acidic cond...

Embodiment 2

[0055] This embodiment discloses a method for removing copper and other impurities in the preparation of tantalum-niobium oxide, which uses the fluoroniobic acid or fluorotantalic acid solution obtained after extraction and separation as a raw material to perform copper removal treatment, including the following steps:

[0056] (1) One time copper removal treatment, in the fluoroniobic acid solution of 4000L, the content of niobium pentoxide is 130-180g / l, to which the copper removal agent solution is added to mix 1.6kg of ammonium sulfide and sodium dithiocarbamate, Control ammonium sulfide and sodium dithiocarbamate to be mixed in a ratio of 92:8 by mass percentage, and stir for 4 minutes under constant stirring to perform a copper removal treatment; control the fluoroniobic acid or fluorotantalic acid The copper content in the solution is 0.28-0.30g / l; and the copper removal treatment is controlled under acidic conditions; the acidity of the solution during the copper remova...

Embodiment 3

[0073] This embodiment discloses a method for removing copper and other impurities in the preparation of tantalum-niobium oxide, which uses the fluoroniobic acid or fluorotantalic acid solution obtained after extraction and separation as a raw material to perform copper removal treatment, including the following steps:

[0074] (1) One-time copper removal treatment, in the 4000L fluoroniobic acid solution, the content of niobium pentoxide is 130-180g / l, and the copper removal agent solution is added to it, which is ammonium sulfide, sodium dithiocarbamate and ammonium sulfate, three Mix 1.6kg of the former, control the ratio of ammonium sulfide, sodium dithiocarbamate and ammonium sulfate to a ratio of 80:5:15 by mass percentage, and stir for 3 minutes under constant stirring to perform a copper removal treatment ; control the copper content in the fluoroniobic acid or fluorotantalic acid solution to be 0.26-0.28g / l; and control the copper removal treatment under acidic conditi...

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Abstract

The present invention provides a method for removing copper and other impurities in preparing tantalum niobium oxide. A fluoroniobic acid solution or a fluorotantalic acid solution obtained after extraction and separation is used as a raw material to perform a treatment of removing copper and other impurities. The method comprises steps of first removal of copper, removal of crude copper residues,neutralization treatment, slurry liquid filtration, washing, drying, secondary washing and drying, and calcination to produce niobium pentoxide or tantalum pentoxide. The method is simple and effective, extremely low in processing costs and obvious in economic benefits, greatly improves value of tantalum niobium oxide, and has obvious characteristics of energy saving and emission reduction, environmental protection, low pollution, obvious economic benefits, etc.

Description

Technical field: [0001] The invention relates to the technical field of extraction of rare metal chemical materials, in particular to a method for removing copper and other impurities for preparing tantalum-niobium oxide. [0002] technical background: [0003] With the development of science and technology, various rare metal elements have also been widely used, such as tantalum and niobium oxides of rare metals, which are widely used in crystal manufacturing, optical glass, electronics and other fields. With the different application technology fields, the requirements for tantalum-niobium oxides are also different. For example, some tantalum-niobium oxides not only have high purity and fine particle size, but also have high requirements for their dispersibility, fluidity and corresponding impurity content. requirements. The conventional method for producing tantalum-niobium oxides is as follows: feed ammonia gas or ammonia solution into tantalum and niobic acid solutions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G35/00C01G33/00
CPCC01G33/00C01G35/00C01P2006/80
Inventor 黄水根胡松张濬哲张和鹏彭小婧樊红波
Owner 江西拓泓新材料有限公司
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